The Hartha Formation (age Late Campanian – Early Maastrichtian) is considered an important oil reservoir in Iraq. The petrography and the diagenetic features were determined based on the analyses of 430 thin sections from selected wells within Balad and East Baghdad oil fields, Ba-2, Ba-3, EB-53, Eb-56 and EB-102. The most important and common diagenesis processes that affect Hartha Formation include Cementation, Neomorphsim, Micrtitization, Dolomitization, Compaction, Dissolution, and Authigenic minerals. This diagenesis deformation on Hartha Formation has overall accentuated the reservoir quality heterogeneity. The reservoir quality evolution is affected by destruction by grain compaction mechanical and chemical (stylolitization) causing decreases in porosity and permeability. The porosity is continuous through stylolite and is affected by dissolution precedes between the stylolite walls. The permeability decreased due to cementation. These processes led to seven proximately heterogeneity units in the Hartha Formation, characterized by a decrease in their porosity as barrier units of the Balad Oil Field. While in the East Baghdad oil field the effective porosity units appeared with less thickness of the barrier unit. The reservoir quality enhancement has resulted from dissolution, recrystallization, and partial dolomitization appeared alternately with the barrier unit in the upper part of Hartha Formation of Balad and Baghdad Oil Fields.
Narratives and invisibility / Viola Gheller -- Invisible cultures in archaeology / Francesco Carrer -- The invisible (im)migrants of the Early Empire between exclusion and assimilation / Davide Astori, Maria Elena Galaverna and Nicola Reggiani -- Post-colonial immigration memory in contemporary France : resistance to epistemic violence / Yoshimi Tanabe -- Gender amender : sex-changing and transgender identities in Ovid's Metamorphoses / Anna Everett Beek -- (Un-)veiling politics : women's political writings during the Julio-Claudian age / Irene Somà -- With pen or brush : traces of women in fifteenth-century Italy / Davide Tramarin -- Urban marginality : other, iteration and materiality : archaeologies of urban life and death in an Argentinean setting (Villa Muñecas, San Miguel de Tucumán) / Martina Hjertman and Per Cornell -- Archaeological indicators for medieval prisons / Lara Tonizzo Feligioni --Transhumant sheep farming and seigniorial economy in the Veronese pre-Alps (twelfth-fourteenth centuries) / Attilio Stella -- In search of the shepherds : archaeological and historical perspectives for the study of salt and animal husbandry in the north of the Kingdom of Granada / Antonio Malpica Cuello, Sonia Villar Mañas, Guillermo García-Contreras Ruiz and Luis Martínez Vázquez -- Society in Erto and Casso : oral history and new investigation methods / Fabrizio Filioli Uranio --Traces of an Indian community in the city of Sumhuram, Oman : investigation of materials found during excavations / Silvia Lischi -- People and things : ceramic petrography as a means for exploring the hidden workings of local communities in postpalatial Crete / Florence Liard -- Where have all the pirates gone? / Aaron L. Beek
Detailed knowledge of chemical, petrographic and mineralogical compositions as well as the effects of applying rock powder on soil chemical properties and plant production are required for classifying these materials as soil remineralizers (SR), as according to Brazilian legislation in force. This study aimed to evaluate the potential of rock powders siltstone, tephrite and olivine melilitite, pure or mixed, on improving the fertility of a Cambisol and a Nitisol as well as the yield of soybean and barley crops grown in succession inside a greenhouse. For that purpose, these products were characterized as their granulometry, chemical, mineralogical and petrographic compositions. Based on the results, it was verified which products met the requirements for registration as SR established by the Normative Instruction Number 5 (NI5) from MAPA. Elemental chemical and grain size analyses indicated that all tested products met the NI5 requirements for their registration as SR. The mineral composition identified through petrographic analyses was confirmed by analyses performed via X-ray diffractometry techniques. Olivine melilitite rock, pure or mixed with siltstone, had the highest agronomic potential when compared to other powders, thus acknowledged as a SR. Although tephrite had little agronomic response on evaluated soils and crops, it also meets the SR requirements. Siltstone fulfilled most of NI5 criteria, except for exceeding the maximum content of free silica (quartz); therefore, it likely does not meet the requirements for its admittance as a SR. ; El conocimiento detallado de la composición química, petrográfica y mineralógica y los efectos de la aplicación del polvo de roca en las propiedades químicas del suelo y en la producción de plantas son necesarios para la clasificación de estos materiales como remineralizantes del suelo (RS), según la legislación brasileña. Este estudio tuvo como objetivo evaluar el potencial del polvo de las rocas siltito, tefrito y olivina melilitito, puras o en mezclas, en la mejora de la fertilidad de un Cambissolo y un Nitossolo y en la productividad de la soja y la cebada cultivadas en sucesión, en casa de vegetación. Para ello, se caracterizaron los productos en cuanto a su granulometría, composición química, mineralógica y petrográfica. A partir de estos resultados, se verificó cuáles de estos productos cumplían los requisitos de la Instrucción Normativa número 5 (IN5), del MAPA, para su registro como RS. Los análisis químicos elementales y la granulometría indicaron que todos los productos probados cumplían los requisitos establecidos en la IN5, para su registro como RS. La composición mineral identificada en los análisis petrográficos fue confirmada por los análisis realizados mediante técnicas de difratometria de rayos-X. La roca de olivina melilitito, pura o combinada con siltito presentó mayor potencial agronómico en comparación con los otros polvos, por lo que puede ser admitida como RS. La tefrito, aunque tuvo poca respuesta agronómica en los suelos y cultivos evaluados, también cumple con los requisitos del RS. La siltito cumplía la mayor parte de los requisitos establecidos por el IN5, excepto la superación del contenido máximo de sílice libre (cuarzo), por lo que es probable que no cumpla los requisitos para su clasificación como RS. ; O conhecimento pormenorizado da composição química, petrográfica, mineralógica e dos efeitos da aplicação de pós de rocha sobre as propriedades químicas do solo e na produção de plantas é exigido para o enquadramento desses materiais como remineralizadores de solos (RMS), segundo a legislação brasileira. Este estudo objetivou avaliar o potencial dos pós das rochas siltito, tefrito e olivina melilitito, puras ou em misturas, na melhoria da fertilidade de um Cambissolo e de um Nitossolo e na produtividade da soja e da cevada cultivadas em sucessão, em casa de vegetação. Para tanto, os produtos foram caracterizados quanto à sua granulometria, composição química, mineralógica e petrográfica. Com base nesses resultados, verificou-se quais desses produtos atenderam aos requisitos da Instrução Normativa número 5 (IN5), do MAPA, para registro como RMS. As análises químicas elementares e da granulometria indicaram que todos os produtos testados atenderam ao estabelecido na IN5, para registro como RMS. A composição mineral identificada nas análises petrográficas foi confirmada pelas análises realizadas por técnicas de difratometria de raios-X. A rocha olivina melilitito pura ou combinada com siltito teve o maior potencial agronômico quando comparada com os demais pós, podendo ser, portanto, admitida como RMS. O tefrito, embora tenha tido pouca resposta agronômica nos solos e nas culturas avaliados, também atende os requisitos para RMS. O siltito se enquadrou na maioria dos quesitos estabelecidos pela IN5, exceto por exceder o conteúdo máximo de sílica livre (quartzo), portanto, é provável que ela não atenda aos requisitos para enquadramento como RMS.
The paper deals with 221 burnt stones from the Scythian graves found on the left bank of the Lower Dniester dated to the 5th—2nd centuries BC. All of them, if it was fixed, come from wooden or handmade ritual vessels. Stones of approximately the same size and without traces of processing were used as heating elements. In all cases, traces of burning were recorded — soot spots and characteristic fracturing. Petrological thin sections showed the mineral composition of the rocks and their structural and textural features. These are, as a rule, sandstones and, much less often, other rocks (carbonate, igneous and metamorphic). The vast majority of stones are of local origin, and only a few are imported. At present, it is obvious that the tradition of fumigating graves among the Scythians of the North-West Black Sea region appeared no later than the 5th century BC. Initially, wooden vessels served as containers for red-hot pebbles and organic balms. Starting from the 3rd century BC as vessels for the same pebbles, handmade incense cups began to be used, widely known not only in the cemeteries of the 3rd—2nd centuries BC near the Glinoe Village and in other sites of the Dniester region, but also in a number of other Scythian sites, situated westwards (Dobruja, Lower Danube region) and eastwards (Bug, Dnieper, Crimea, Azov and Don regions). Keywords: Scythians, graves, 5th—2nd centuries BC, left bank of the Lower Dniester, wooden and handmade ritual vessels, petrography, rocks
Petrography, diagenesis, and facies analyses as well as the depositional environments of the late Campanian-Maastrichtian sequence in southwestern Iraq are studied in five keyholes. The sequence incorporates parts of the Hartha, Shiranish and Tayarat Formations. The Hartha Formation comprises creamy and organodetrital dolomite, grey dolomitic marl, and evaporites. The Shiranish Formation is composed of grey marl and claystone, whereas the Tayarat Formation is composed of grey ash, along with tough and fossiliferous dolomitic limestone inter-bedded with grey mudstone layers and/or wisps. Several diagenetic processes affected the sequence, such as neomorphic replacement, dissolution, dolomitization, and sulphate development. Some of these processes obliterated the primary textures.
The late Campanian-Maastrichtian sequence consists of three microfacies (Dolomitic Intraclastic Limestone, Dolomitized Biomicrite, and Biomicrosparite Microfacies) and two lithofacies (Mudrock and Sulphates-Rock Lithofacies), in addition to Fine- to Medium-Crystalline Dolomite Lithotype.
The Hartha Formation is evaporitic, possibly with supratidal sabkha deposits. The overlying Tayarat and Shiranish Formations reflect deposition in a warm tropical to subtropical reefal and open marine conditions, as deduced from faunal assemblages. Some effects of deep marine condition are evident by the presence of Shiranish facies. The sequence represents deposition in the central reef- fore reef area. The absence of isolated back-reef lagoon facies suggests that the reef was patchy without isolation of water in the middle shelf region. However, at the top of the sequence, i.e. at the end of the Cretaceous Period, restricted lagoons seem to have dominated the studied succession.
Southern West Greenland hosts a province of ultramafic alkaline rocks, including swarms of dykes traditionally described as kimberlites and lamproites (Larsen 1991; Jensen et al. 2002). Since the mid-1990s, commercial diamond exploration has been focused on the Sarfartoq region and the region south-east of Maniitsoq (Fig. 1), and has resulted in numerous reports of diamond-favourable indicator minerals from till sampling, finds of kimberlitic dykes, and recovery of diamonds from kimberlitic rocks. A new digital compilation of company data released from confidential status (Jensen et al. 2003a) presents a comprehensive overview of exploration activities and results that have emerged since the Survey's first compilation of occurrences of kimberlitic and related rocks (Larsen 1991). The new compilation in a GIS (geographic information system) environment allows for refined assessment of the distribution, structural control and possible spatial and petrogenetic relationships that characterise the kimberlitic occurrences. In 2003, the Geological Survey of Denmark and Greenland (GEUS) and the Government of Greenland's Bureau of Minerals and Petroleum (BMP) went further than has been customary in investigating the economic potential of specific sites. Four areas were temporarily closed to application for exploration licences, pending sampling and testing for diamond content of large samples of more than one tonne each from significant kimberlitic occurrences. Additional characterisation and research initiated on these and other occurrences include magnetic mapping, detailed petrography and studies of mantle xenoliths, as well as indicator mineral chemistry. An extensive programme to determine the ages of kimberlitic and related rocks was also initiated in 2003.
AbstractLabuan, Miri, Kundasang and Raub regions of Malaysia have very different geological formations and settings that could result in different levels of natural radioactivity. Hence, this study determines the influence of different geological formations on radioactivity in these locations using field measurements, petrology and geochemistry. A total of 141 gamma dose rates and 227 beta flux measurements were collected using Polimaster survey meters (PM1405) in these four regions. The gamma dose rate values range from 0.37 to 0.05 µSv/h with a mean value of 0.11 µSv/h. Beta flux values range from 3.46 to 0.12 CPS with a mean value of 0.57 CPS. Mineralogy and elemental composition of the different rock types were analysed using thin-section petrography, XRD, ICP and pXRF methods. Felsic igneous rocks such as syenite and granite have higher natural radioactivity and contain more radionuclide-bearing minerals such as apatite, zircon, allanite, K-feldspar, titanite, muscovite and biotite. Metamorphic rocks have the second highest natural radioactivity and contain fewer radioactive minerals. The natural radioactivity of sedimentary rocks mostly depends on their clay content. The gamma dose rate maps show that igneous and metamorphic regions around Raub have higher radioactivity compared to the sedimentary-dominated regions around Miri and Labuan. Annual effective dose (AED) and excess lifetime cancer risk (ELCR) were calculated to evaluate the potential health risk for inhabitants of these regions. Labuan and Miri are considered to be safe zones with respect to natural radioactivity as the results show little to no risk for the public, compared with the Raub region, which is medium to high risk.
ABSTRACT The present thesis studies the ceramic fragments with negative painted decoration found at the site Pampa la Cruz located in the Huanchaco Bay. Through the application of analytical techniques such as Petrography and X-ray diffraction, I aim to know the technological variability and mineralogical composition of the studied ceramic fragment collection. In this light, I carried out a geological and ethnographic analysis in the vicinity of Huanchaco and nearby valleys in order to know the possible clay quarries that served for the manufacture of these ceramic vessels. Under this perspective, I intend to know the area of resource capture which served for the manufacture of these vessels and how they are inserted into the political and economic networks of the early Intermediate of the northern coast of Peru. ; RESUMEN El presente trabajo estudia la cerámica con decoración negativa del sitio Pampa la Cruz (Bahía de Huanchaco) mediante la aplicación de técnicas analíticas como la Petrografía y Difracción de Rayos X, para conocer la variabilidad tecnológica y composición mineralógica de estos, de esta manera se hace un análisis geológico y etnográfico de la zona a fin de conocer las posibles canteras de arcilla que sirvieron para la fabricación de vasijas con decoración negativa, con ello se presenta un análisis mineralógico de estas arcillas, bajo esta perspectiva pretendemos conocer el área de captación de recursos que sirvió para la fabricación de estas vasijas y como estas se insertan en las redes políticas y económicas del Intermedio temprano en la costa norte del Perú. ; Tesis
International audience ; The GEOTREF project (high enthalpy geothermal energy in fractured reservoirs), supported by the French government program, "Investissements d'avenir" develops a sustainable geothermal resource in the Vieux Habitants area, 8-km south of the currently exploited Bouillante geothermal field. The Basse Terre Island is a recent volcanic arc (< 3 Myr) belonging to the Lesser Antilles subduction zone. It is composed of arc typical calc-alkaline volcanic rocks. Outcrops of the studied area consist either of andesitic lava flows, volcanic sedimentary facies or dikes. Field studies allow to propose a structural framework and highlight three major directions N000˚ E, N050˚ E and N090˚ E, which are consistent with the regional tectonic trends of the arc. Petrographical and petrophysical studies displayed that the major part of outcropping facies in the Vieux-Habitants area are not altered. Andesitic lava flows have poor reservoir properties with porosity and permeability lower than 5 % and 10-15m2 respectively. These results are in contrast with measurements performed in volcano-sedimentary rocks, which have heterogeneous petrophysical properties ranging from 15 to 50 % for porosity and from 10-15to 10-9m2 for permeability. Such surface data would probably change and decrease when depth increases. As there is a lack of underground data under the Vieux-Habitants area (wireline, drill core), exhumated rocks outcropping in the northern part of Basse-Terre Island (Basal Complex) have been studied. Such rocks have been identified in the Basal Complex (2.5 - 3 Myr) located in the northern part of the Basse-Terre Island. Previous works have demonstrated a 1000 m/Myr erosional rate, which corresponds at least to a 2 - 3 km exhumation. The petrography study of the Basal Complex reveals sub-greenschist type mineralogical transformations (chlorite, white mica, quartz.) changing the andesitic protolith in a meta-andesite. This metamorphism forms cleavage plans thanks to a pressure-solution mechanism. ...
International audience ; The GEOTREF project (high enthalpy geothermal energy in fractured reservoirs), supported by the French government program, "Investissements d'avenir" develops a sustainable geothermal resource in the Vieux Habitants area, 8-km south of the currently exploited Bouillante geothermal field. The Basse Terre Island is a recent volcanic arc (< 3 Myr) belonging to the Lesser Antilles subduction zone. It is composed of arc typical calc-alkaline volcanic rocks. Outcrops of the studied area consist either of andesitic lava flows, volcanic sedimentary facies or dikes. Field studies allow to propose a structural framework and highlight three major directions N000˚ E, N050˚ E and N090˚ E, which are consistent with the regional tectonic trends of the arc. Petrographical and petrophysical studies displayed that the major part of outcropping facies in the Vieux-Habitants area are not altered. Andesitic lava flows have poor reservoir properties with porosity and permeability lower than 5 % and 10-15m2 respectively. These results are in contrast with measurements performed in volcano-sedimentary rocks, which have heterogeneous petrophysical properties ranging from 15 to 50 % for porosity and from 10-15to 10-9m2 for permeability. Such surface data would probably change and decrease when depth increases. As there is a lack of underground data under the Vieux-Habitants area (wireline, drill core), exhumated rocks outcropping in the northern part of Basse-Terre Island (Basal Complex) have been studied. Such rocks have been identified in the Basal Complex (2.5 - 3 Myr) located in the northern part of the Basse-Terre Island. Previous works have demonstrated a 1000 m/Myr erosional rate, which corresponds at least to a 2 - 3 km exhumation. The petrography study of the Basal Complex reveals sub-greenschist type mineralogical transformations (chlorite, white mica, quartz.) changing the andesitic protolith in a meta-andesite. This metamorphism forms cleavage plans thanks to a pressure-solution mechanism. ...
International audience ; The GEOTREF project (high enthalpy geothermal energy in fractured reservoirs), supported by the French government program, "Investissements d'avenir" develops a sustainable geothermal resource in the Vieux Habitants area, 8-km south of the currently exploited Bouillante geothermal field. The Basse Terre Island is a recent volcanic arc (< 3 Myr) belonging to the Lesser Antilles subduction zone. It is composed of arc typical calc-alkaline volcanic rocks. Outcrops of the studied area consist either of andesitic lava flows, volcanic sedimentary facies or dikes. Field studies allow to propose a structural framework and highlight three major directions N000˚ E, N050˚ E and N090˚ E, which are consistent with the regional tectonic trends of the arc. Petrographical and petrophysical studies displayed that the major part of outcropping facies in the Vieux-Habitants area are not altered. Andesitic lava flows have poor reservoir properties with porosity and permeability lower than 5 % and 10-15m2 respectively. These results are in contrast with measurements performed in volcano-sedimentary rocks, which have heterogeneous petrophysical properties ranging from 15 to 50 % for porosity and from 10-15to 10-9m2 for permeability. Such surface data would probably change and decrease when depth increases. As there is a lack of underground data under the Vieux-Habitants area (wireline, drill core), exhumated rocks outcropping in the northern part of Basse-Terre Island (Basal Complex) have been studied. Such rocks have been identified in the Basal Complex (2.5 - 3 Myr) located in the northern part of the Basse-Terre Island. Previous works have demonstrated a 1000 m/Myr erosional rate, which corresponds at least to a 2 - 3 km exhumation. The petrography study of the Basal Complex reveals sub-greenschist type mineralogical transformations (chlorite, white mica, quartz.) changing the andesitic protolith in a meta-andesite. This metamorphism forms cleavage plans thanks to a pressure-solution mechanism. ...
International audience ; The GEOTREF project (high enthalpy geothermal energy in fractured reservoirs), supported by the French government program, "Investissements d'avenir" develops a sustainable geothermal resource in the Vieux Habitants area, 8-km south of the currently exploited Bouillante geothermal field. The Basse Terre Island is a recent volcanic arc (< 3 Myr) belonging to the Lesser Antilles subduction zone. It is composed of arc typical calc-alkaline volcanic rocks. Outcrops of the studied area consist either of andesitic lava flows, volcanic sedimentary facies or dikes. Field studies allow to propose a structural framework and highlight three major directions N000˚ E, N050˚ E and N090˚ E, which are consistent with the regional tectonic trends of the arc. Petrographical and petrophysical studies displayed that the major part of outcropping facies in the Vieux-Habitants area are not altered. Andesitic lava flows have poor reservoir properties with porosity and permeability lower than 5 % and 10-15m2 respectively. These results are in contrast with measurements performed in volcano-sedimentary rocks, which have heterogeneous petrophysical properties ranging from 15 to 50 % for porosity and from 10-15to 10-9m2 for permeability. Such surface data would probably change and decrease when depth increases. As there is a lack of underground data under the Vieux-Habitants area (wireline, drill core), exhumated rocks outcropping in the northern part of Basse-Terre Island (Basal Complex) have been studied. Such rocks have been identified in the Basal Complex (2.5 - 3 Myr) located in the northern part of the Basse-Terre Island. Previous works have demonstrated a 1000 m/Myr erosional rate, which corresponds at least to a 2 - 3 km exhumation. The petrography study of the Basal Complex reveals sub-greenschist type mineralogical transformations (chlorite, white mica, quartz.) changing the andesitic protolith in a meta-andesite. This metamorphism forms cleavage plans thanks to a pressure-solution mechanism. ...
International audience ; The GEOTREF project (high enthalpy geothermal energy in fractured reservoirs), supported by the French government program, "Investissements d'avenir" develops a sustainable geothermal resource in the Vieux Habitants area, 8-km south of the currently exploited Bouillante geothermal field. The Basse Terre Island is a recent volcanic arc (< 3 Myr) belonging to the Lesser Antilles subduction zone. It is composed of arc typical calc-alkaline volcanic rocks. Outcrops of the studied area consist either of andesitic lava flows, volcanic sedimentary facies or dikes. Field studies allow to propose a structural framework and highlight three major directions N000˚ E, N050˚ E and N090˚ E, which are consistent with the regional tectonic trends of the arc. Petrographical and petrophysical studies displayed that the major part of outcropping facies in the Vieux-Habitants area are not altered. Andesitic lava flows have poor reservoir properties with porosity and permeability lower than 5 % and 10-15m2 respectively. These results are in contrast with measurements performed in volcano-sedimentary rocks, which have heterogeneous petrophysical properties ranging from 15 to 50 % for porosity and from 10-15to 10-9m2 for permeability. Such surface data would probably change and decrease when depth increases. As there is a lack of underground data under the Vieux-Habitants area (wireline, drill core), exhumated rocks outcropping in the northern part of Basse-Terre Island (Basal Complex) have been studied. Such rocks have been identified in the Basal Complex (2.5 - 3 Myr) located in the northern part of the Basse-Terre Island. Previous works have demonstrated a 1000 m/Myr erosional rate, which corresponds at least to a 2 - 3 km exhumation. The petrography study of the Basal Complex reveals sub-greenschist type mineralogical transformations (chlorite, white mica, quartz.) changing the andesitic protolith in a meta-andesite. This metamorphism forms cleavage plans thanks to a pressure-solution mechanism. ...
International audience ; The GEOTREF project (high enthalpy geothermal energy in fractured reservoirs), supported by the French government program, "Investissements d'avenir" develops a sustainable geothermal resource in the Vieux Habitants area, 8-km south of the currently exploited Bouillante geothermal field. The Basse Terre Island is a recent volcanic arc (< 3 Myr) belonging to the Lesser Antilles subduction zone. It is composed of arc typical calc-alkaline volcanic rocks. Outcrops of the studied area consist either of andesitic lava flows, volcanic sedimentary facies or dikes. Field studies allow to propose a structural framework and highlight three major directions N000˚ E, N050˚ E and N090˚ E, which are consistent with the regional tectonic trends of the arc. Petrographical and petrophysical studies displayed that the major part of outcropping facies in the Vieux-Habitants area are not altered. Andesitic lava flows have poor reservoir properties with porosity and permeability lower than 5 % and 10-15m2 respectively. These results are in contrast with measurements performed in volcano-sedimentary rocks, which have heterogeneous petrophysical properties ranging from 15 to 50 % for porosity and from 10-15to 10-9m2 for permeability. Such surface data would probably change and decrease when depth increases. As there is a lack of underground data under the Vieux-Habitants area (wireline, drill core), exhumated rocks outcropping in the northern part of Basse-Terre Island (Basal Complex) have been studied. Such rocks have been identified in the Basal Complex (2.5 - 3 Myr) located in the northern part of the Basse-Terre Island. Previous works have demonstrated a 1000 m/Myr erosional rate, which corresponds at least to a 2 - 3 km exhumation. The petrography study of the Basal Complex reveals sub-greenschist type mineralogical transformations (chlorite, white mica, quartz.) changing the andesitic protolith in a meta-andesite. This metamorphism forms cleavage plans thanks to a pressure-solution mechanism. ...
