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Subsurface geological model of sedimentary and metasedimentary wedge from Mansehra to Battal based on gravity data,Hazara area,Pakistan

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Energy Geoscience 2021年第4期2卷 229-237页

作者： Rizwan Sarwar Awan Ashar Khan Chenglin Liu Shangfeng Yang Qibiao Zang Yuping Wu Guoxiong Li Khawaja Hasnain Iltaf Muhammad Tahir Sajjad Ali College of Geosciences China University of PetroleumBeijing102249China State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumBeijing102249China The University of Azad Jammu and Kashmir Muzaffarabad Pakistan Water and Power Development Authority Pakistan Research Institute of Unconventional Petroleum China University of PetroleumBeijing102249China

This study is aimed to delineate the subsurface structural elements using geophysical techniques in the Haraza area of *** investigated the Oghi and Battal thrust faults,sedimentary and metasedimentary wedge,and the absolute crustal thickness based on terrestrial gravity *** seismic survey relying on wave propagation,magnetic survey is based on both attraction and repulsion,and electrical and electromagnetics on *** attractive gravity field produces relatively simpler patterns of anomalies,like a series of highs and lows over regions with undulating basements and buried structures.A qualitative interpretation of gravity data reveals a good deal of *** the collision of Indian and Eurasian Plates,compressional structures were developed in the Lesser Himalayas or northwest of the Hazara Kashmir *** study mainly focuses on the western limb of the Hazara Kashmir *** regional and local Bouguer anomalies were incorporated to delineate the regional structural *** gravity model is computed through geophysical technique along with profile A-A'from Mansehra to the Battal area that demarcates the blind Oghi Thrust and emergent Battal *** Formation of Precambrian age demarcates the Oghi Thrust near Kotli Pine while the Battal Thrust is demarcated within the Mansehra Granite of Cambrian to Ordovician age near *** with the Battal Thrust,fault gouge and breccias have been observed during the field *** total thickness of the sedimentary/metasedimentary wedge in the Mansehra and Battal areas was estimated to be 13.6 km and 14.2 *** comparison,the total thickness of crust in the Mansehra and Battal areas was 51.6 km and 52.2 km,respectively.

关键词： Gravity metasedimentary Geophysical anomaly Hazara Autograv

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Palaeoproterozoic High-metamorphic metasedimentary Units of Siberian Craton

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地学前缘 2009年第S1期16卷 201-201页

作者： Lena Urmantseva Institute of Geology and Mineralogy Siberian BranchRussian Academy of Sciences

In this paper,I report SHRIMP zircon U-Pb ages of Paleoproterozoic high-grade metasedimentary rocks from southwestern part of the Siberian *** Precambrian high-grade complex including garnet -biotite,hypersthene-bioti... 详细信息

关键词： Siberian Craton Palaeoproterozoic zircon SHRIMP U-Pb dating metasedimentary rocks

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Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (Kédougou-Kéniéba Inlier, Southeastern Senegal)

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International Journal of Geosciences 2024年第4期15卷 303-333页

作者： Masse Ndour Papa Moussa Ndiaye Koffi Félix Ekra Alain Ndong Malick Faye Pierre Ndour African Star Resources Yoff Dakar S&#233n&#233gal Dé partement de G&#233ologie Universit&#233 Cheikh Anta Diop Dakar S&#233n&#233gal

The Douta permit of African Star Resources/Thor Explorations, located in the southeast of Senegal, in the Kédougou-Kéniéba Inlier (western part of the West African Craton), is dominated to the East by metasedimentary formations such as greywackes, shales, graphitic shales, quartzites, cherts, claystones and breccias characteristic of the Dialé-Daléma basin. To the West, the mafic formations of the Mako volcanic belt are the most common. metasedimentary rocks are associated with metavolcanosedimentary terms found at the contact zones between the two (2) Birimian groups. These different geological formations are cut by mafic dolerite and gabbro sills and/or dykes, as well as quartz and microgranite veins. The Douta gold project is crossed from North to South by the MTZ (Main Transcurrent Zone), generally oriented NE-SW and becoming N-S towards the North. The permit is characterized by several shear corridors. The rocks are affected by brittle, brittle-ductile to ductile deformations. The gold mineralization is hosted by a NE-trending shear corridor called the Makosa corridor (Makosa shear zone), therefore sub-parallel to the MTZ. It has a subvertical dip (75˚ to 85˚ to the NW). It is associated with a hydrothermal phase characterized by quartz-sericite-epidote-fine, disseminated pyrite and arsenopyrite ± albite ± chlorite paragenesis. These minerals testify to the existence of a low degree of metamorphism (greenschist facies, epizonal domain) in the area. However, metamorphism reaches amphibolite facies in some places, particularly in the vicinity of intrusive bodies, with the presence of hornblende (amphiboles) and plagioclase. The gold mineralization is mainly hosted by two (2) metasedimentary lithological units: meta-greywackes and shales.

关键词： Douta Kédougou-Kéniéba Inlier Senegal metasedimentary MTZ Control Gold Mineralization Makosa Corridor

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