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Geometry and Mechanism of Dalianghui Anticline in Micangshan Foreland, Thrust Belt, Northern Sichuan Basin

Author: WenZhu
Tutor: HeDengFa
School: Chinese Geology University (Beijing)
Course: Mineral prospecting and exploration
Keywords: Micangshan Slip layer Theory of fault-related folds Magnetic stratigraphy Unconformity Growth strata
CLC: P542
Type: Master's thesis
Year: 2010
Downloads: 151
Quote: 0
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Abstract


Micangshan structural position is located in northern Sichuan Basin, northern neighboring Micangshan east to west Qinling belt, east near Daba arc nappe, west side near Songpan - Ganzi and North East Longmen orogenic nappe tectonic belt, Micangshan tectonic system constructed by three common control systems. Micangshan structural position in which its own unique lithological variability of Micangshan eventually led to a complex composite orogenic belt, the article focused on the complex structure before Micangshan Geometry and kinematics of research, proposed structural changes catagen times and when asked. This is mainly through the former lithology Micangshan study divided Micangshan slip layer before the main, they are Sinian shale, Cambrian clay shale, Triassic Jialing Group cream rock; combining a number of stratigraphic section right before Micangshan structural geometry studies to determine Micangshan from west to east structural feature changes, and detachment layer depth variation, different depths by different structural characteristics slipping layer control and combine Micangshan be constructed before the seismic analysis, the use of fault-related folds theory, the cross-sectional area for other dip into the shaft surface analysis, its basal thrust fault geometry conduct research on the thrust generated by the displacement volume for analysis. By Micangshan Xujiahe last night Triassic to Early Cretaceous strata JIANMENGUAN group formations magnetic stratigraphy obtained from the Late Triassic strata Xujiahe to Early Cretaceous sedimentary Hanyang shop Formation Experience: Xujiahe deposition was scheduled from 227.4Ma-209.6Ma; Baitianba group deposition was scheduled from 199.6Ma-193.8Ma; Qianfoyan sedimentary from 193.8Ma-175.6Ma; Shaxi Temple Group sedimentary from 175.6Ma-163.6Ma; Suining Formation deposition is scheduled for 163.6Ma-161.2Ma; jianmenguan Formation deposition is scheduled for 144.9Ma-140.4Ma; Hanyang shop Formation final set at 140.4 deposition time Ma-132.8Ma. Through field from the Late Triassic to Early Cretaceous unconformity identification: Late Triassic strata and Xujiahe Early Jurassic unconformity Baitianba group; Late Jurassic strata and early Penglaizhen Cretaceous unconformity JIANMENGUAN group, largely determine the time Micangshan uplift. Combined with the rate of change over the layer deposition and growth strata identified in the final formulation Micangshan Early Indosinian and Yanshan uplift occurs once each. Through surface seismic profiles and the analysis, seismic displacement Micangshan analysis: measuring line 2004-dlh-001 displacement greater than 28km, measuring line TNB-04-04-118MIG displacement of 28km, the survey line cross-hb102 displacement of 16.9km, wherein the substrate thrust generated Late Triassic time. Ultimately concluded Micangshan ago from west to east tectonic features from hard to Jane, from big to small displacement, tectonic stress strong to weak; Mesozoic times since there are two tectonic movement are: Late Triassic and Early Yanshanian , of which two sessions anticline basic shape in the late Triassic and early Yanshanian tectonic movement prompted Tongnanba anticline formation.

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CLC: > Astronomy,Earth Sciences > Geology > Structural Geology > Tectonic movement
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