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The Gangnam - Xuefeng structure with the southwestern margin of the structural characteristics of

Author: FanJunLei
Tutor: LuoJinHai
School: Northwestern University
Course: Structural Geology
Keywords: The Gangnam - xuefeng tectonic zone Upper Yangtze Block Deposition Structural features
CLC: P542
Type: Master's thesis
Year: 2009
Downloads: 245
Quote: 0
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Abstract


The the shallow metamorphic rocks of the the Gangnam - Xuefeng structure with a wide range of outcropping the Neoproterozoic Banxi group Sinian - Lower Paleozoic unconformity thereon. Xuefeng Tectonic Belt is now widely recognized that the Caledonian uplift on the southeast edge of the Yangtze continent. Papers with the southwestern margin of the Jiangnan - Xuefeng structure Carey - Congjiang - melt water - financial security - Dushan geological structure in the vicinity of the main research object to study the tectonic point of view from a different era sedimentary facies spatial variation and evolution of sedimentary basins . While sedimentological studies, assisted by magmatic rock geochemistry and isotope geochronology, mainly made following an initial understanding of: 1, on the southeastern part of the Yangtze Block and the Gangnam - Xuefeng Tectonic Belt southwest margin Carey - Liping - financial water areas outcropping the Neoproterozoic Banxi group to the Middle Triassic, Upper Triassic, Lower - Middle Jurassic and Upper Cretaceous local outcropping Paleogene and Neogene in the study area basically is not developed. From the bottom up, the study area can be divided into four structural layers, namely: Sinian basement structure layer, Sinian - Lower Paleozoic tectonic layer Devonian - Triassic structural layer and the structural layer above the Triassic they were reflected in the study area experienced four large geological development stage. From the bottom up, deposition regular migration from southeast to northwest. 2 tectonic deformation most significant feature is roughly bounded by Kerry - Dushan line, something both sides have different tectonic deformation characteristics. Caledonian movement east Carey - Dushan first-line performance for the folding movement, led to the formation in the Lower Paleozoic EW fold the Devonian the angular unconformity coverage above the Lower Paleozoic fold next volts; Kay the Caledonian movement inside - Dushan west vertical uplift, Late Silurian basically absent deposition and the Devonian under Fuseshita the parallel between the Paleozoic unconformity. Western Yanshan movement showed strong folding movement, resulting in a wide range of the Jurassic - Cretaceous missing, as well as an angular unconformity between the sporadic development of coarse clastic rocks of the Upper Cretaceous Maotai group and its underlying strata; eastern Yanshan Movement The strong stretching exercises, resulting in a wide range of South China granite occur. The study area is missing Paleogene and Neogene, according to Quaternary river terraces and cave development situation, the Himalayan movement in the study area for the vertical movement of the lift. 3 inheritance relationship between the tectonic deformation of the study area, a number of long-term activities of the regional faults and resurrection fault not only destroyed the basement structure, but also to control the deposition of the caprock. Faults and folds are well developed in the study area, the financial security of the eastern part of the study area along the fracture formed in the Caledonian, the late and superimposed on the role of the Yanshanian the transformation; fracture of the west of the study area is mainly formed in Yanshanian. General orientation towards the faults and folds of the study area to divide the major four groups fracture fold system, north east, north west, north to south, and a small amount of nearly east-west fault system. Age value of 836, papers Qiandongnan from Jiang County Sau Tong estuary granitic rocks Laser Plasma Mass Spectrometry (La-ICP-MS) zircon U-Pb isotope geochronology determination to obtain the granitic rocks. ± 5.1Ma. The Qiandongnan - and northern Neoproterozoic early - mid-acidic magmatism occurred in the time at the Jiangnan Orogen peak period collision orogeny, should be formed at the Jiangnan Orogen peak after the collision extensional stage magmatic activity, it is the Qiandongnan - and northern part of the contemporary mass acidic magmatism. Jiangnan - the Xuefeng constructed with the southwestern margin of Nanhua - Early Paleozoic regional subsidence and thick sedimentary formations formed in the area stretching from the Qingbaikou background. 5, the southwestern margin of the Jiangnan - Xuefeng Tectonic Belt and adjacent areas since the Neoproterozoic experienced four stages of deposition - tectonic evolution (1) a early Rodinia Qingbaikou oldland is the formative stages: Yangtze China plots flatten Jiangnan Orogen formation; (2) Qingbaikou late - Silurian:. Cathaysia block and Yangize block have the ancient land cleavage amassed stages: Jiangnan - Xuefeng with rift subsidence (Qingbaikou late - Middle Ordovician) with the uplift and denudation (Late Ordovician - Silurian Period). They can be divided into four sub-phases: Qingbaikou late - Sinian (820-680Ma) Jiangnan - xuefeng rift basin, Sinian - Middle Ordovician Jiangnan - xuefeng sag basin and Late Ordovician folds of the eastern part of the study area of ??the world - Silurian deformation and uplift and denudation of the west. (3) The Devonian - Triassic: the Yangtze craton Depression and NW superimposed to Ziyun - in Luodian, - Nandan aulacogen evolutionary stages. Including four sub-phases: Devonian Ziyun - Luodian - Nandan crack notch groove tensile and elsewhere Depression Carboniferous - Permian intracratonic carbonate platform, Early - Middle Triassic regressive background conversion under shallow water basin and the Late Triassic ocean-continent. (4) the Yanshan - Himalayan period: pots, mountain evolution with strong transformation stage. Consists of three sub-stages: Late Jurassic - Early Cretaceous (early Yanshanian) Jiangnan - Xuefeng intracontinental tectonic deformation, Late Cretaceous - Paleogene (Late Yanshanian - Early Himalayan) lithospheric extension less thin role of A-type granites role and Neogene date (Late Himalayan) strong intracontinental deformation stage. 6 papers in the field geological investigation and on the basis of data analysis studies of the stratigraphy, tectonics and magmatic rocks, fully integrated tectonic units of the Yangtze Block and Jiangnan - Xuefeng Tectonic Belt of the latest research results support previous Xuefeng Tectonic Belt is the point of view of the southeast edge of the Yangtze continent Caledonian uplift.

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