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The U-Pb chronologic evidence and sedimentary responses of Silurian tectonic activities at northeastern margin of Tarim Basin

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Science China Earth Sciences 2012年第9期55卷 1445-1460页

作者： LIU JingYan YANG HaiJun YANG YongHeng CAI ZhenZhong LIU YongQuan RUI ZhiFeng SU ZhenZhen Ministry of Education's Key Laboratory of Marine Reservoir Evolution and Oil&Gas Accumulation Mechanism China University of GeosciencesBeijing 100083China Institute of Petroleum Exploration and Exploitation Tarim Oil Field CompanyPetroChinaKorla 841000China

U-Pb ages of Devonian detrital zircons from Tabei Uplift have been determined through LA-ICP-MS test *** results revealed that most zircon ages concentrate on 460-414 Ma,especially around 436-423 Ma,indicating possible occurrences of strong tectonic events at the northern margin of Tarim Basin during that *** with previous researches on the basin marginal orogenic belts,intense tectonic activities developed at the northeast margin of Tarim Basin and its obvious sedimentary responses in basin during the end of Ordovician to Early-Middle Silurian are *** include(1) several unconformities within the Late Ordovician-Silurian,showing truncation,erosion,and onlap characteristics,which reflected the local uplift formed during the surrounding extrusion process;(2) the Silurian fluvial delta system from northeast to southwest in Keping,Yingmaili,Hade,and Caohu areas,which reflected the partial uplift at the northeast margin and provided clastic supply to basin;and(3) as indicated by heavy mineral analysis,the Silurian sediments came mainly from the recycles of orogenic belts provenance,which indicated the compress tectonic *** addition,a wide range of red mudstone layer distribution in the upper part of the Silurian may be closely related to the surrounding tectonic uplift and the rapid decline of sea levels.

关键词： detrital zircon U-Pb geochronology tectonic activities Silurian northeastern margin of Tarim Basin

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Analytical Results of Cam Ranh-Tuy Phong Fault Characteristics and Its Relation to Mud Eruption in Nam Trung Bo Area, Viet Nam

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Journal of Geological Resource and Engineering 2016年第7期4卷 335-344页

作者： Truong Thanh Phi Van Thom Bui Dang Manh Nguyen Hanoi University of Natural Resources and Environment Hanoi Vietnam Institute of Geology Viet Nam Academy of Science and Technology Hanoi Vietnam

By analyzing the satellite images, topology map, geology map, geomorphology map, and field survey data, this study has determined the Cam Ranh-Tuy Phong fault in the South Central area, Viet Nam has NE-SW orientation and inclines to SE with high slope angle of 70-80°. During the Pliocene-Quaternary period, the Cam Ranh-Tuy Phong fault is left-lateral movement with the extension mechanisms, which formed the graben have an NE-SW orientation, deposited by Quaternary sediment. The fracture systems and fault are the channels for the mineral water and hot water to move up from the deep zone in the area of Cam Thinh Dong, Ha Nhi, Vinh Hao, Nha Me, Tuy Thinh..., and also to be the channels for the mud material, clay and underground water to move from below zone to the surface to form high mud mounds. The analytical results of clay mud have identified clay mineral composition to be main montmorilonit, illite, kaolinite, calcite, chlorite. The occurrence of montmorilonit minerals in this study area is characterized by the alkali-rich environment. The chemical composition of calcite is determined forming in the environment of with pH 〉 9, characterized by the add climates. Besides, other analytical results of clay mud also identified some minerals, such as： ankerite （Fe, Mg）CO3, calcite and some accessory minerals such as： fluorite, lepidocrokit with the participation hydrothermal process.

关键词： Fault zones mud eruption tectonic activities mineral water hot water.

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Geological Study of Tangi Mahi-Par Mountain Range along Kabul Jalalabad Road, Afghanistan

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Open Journal of Geology 2020年第10期10卷 971-980页

作者： Hafizullah Rasouli Mohammad Hasib Sarwari Khairuddin Rasikh Said Amin Hashimi Department of Geology Geoscience Faculty Kabul University Kabul Afghanistan Department of Geology and Mining Science Faculty Nangarhar University Nangarhar Afghanistan

Tangi Mahi-par is a fault valley from previews geological period (Pleistocene) where the Kabul basin was a lake and occupied by water, and after the formation of Tangi Mahi-par fault valley, water was drained from this way. Therefore, this research is essential to elucidate the different rocks types and structures, with no or scarce previous research’s in this mountainous area. The main objective of this study is to selected rock type, rocky structures and different sizes of river sediments transported by rivers discharge from the previous geological periods. There are different types of sediments, terrace remnants, rocks and geological structures which are generally consist of Limestone and Gneiss, where the limestone is likely belonging to the Thythes ocean remnants in Afghanistan and contains Ammonites fossils. In some parts volcanic breccias, it shows the old volcanic eruptions, Stalactite and stalagmite Carbonitic sediments related to limestones are also present there. In addition, there are different types of geological structures such as Anticline, Syncline, dyke, Sill, Apophysis, Graben and Horst. Unconformities and horizontal layers related to Khengal and Cottagay series passing from this area are located one by another.

关键词： tectonic activities Limestone Gneiss Graben Horst

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