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Structure Evolution and Chronology Constrains of Lang Shan in Neimeng Autonomous Region

Author: GaoHongLei
Tutor: WangZuo
School: Chinese Geology University (Beijing)
Course: Structural Geology
Keywords: Wolf Mesozoic Multi-stage deformation Northeast-trending Tectonic thermal chronology
CLC: P542
Type: Master's thesis
Year: 2010
Downloads: 223
Quote: 0
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Abstract


Wolf , located in the central and western Inner Mongolia , its east Yinshan - Yanshan tectonic zone , west of Alxa block to the south and the western margin of the Ordos thrust nappe connected, is of a northwestern Ordos Basin north trending structural zone , experienced a multi-period in the Mesozoic tectonic movement . Wolf orogenic structure within the main north -trending strike-slip and thrust , thrusting the early transformation of strike-slip . Ductile shear zone in granite strong cleavage , cleavage plane accompanied generate biotite , muscovite . By U-Pb zircon dating and Ar-Ar dating of Wolf Mesozoic tectonic movement for different periods determined chronology can be Wolf since Mesozoic tectonic evolution is divided into three : 1) ~ 242-234Ma, in Triassic : With the closure of the Paleo-Asian Ocean , south Siberian Plate and North China plates squeeze collision , extrusion forming region in the Wolf made ??a lot of mountains and accompanying acidic magma intrusion, earlier or later period , Wolf regional development there ductile shearing , ductile shear zones in the region within the Wolf utilize Ar-Ar dating , measured ~ 237-213Ma deformed muscovite ages . 2 ) medium - Late Jurassic : Wolf region are developed NE-trending strike-slip faults and ductile shear zones in the north-east Wolf ductile shear zone Niece got ~ 178-173Ma deformed biotite ages . Wolf Mountain area in the upper crust formed NE trending strike-slip , with the eastern part of China North East to form a simultaneous structural pattern , which may be related to Jurassic Ordos counterclockwise rotation of westward subduction of the Pacific Plate and the ancient remote effects related . 3 ) Late Jurassic - Early Cretaceous : Wolf widely developed a set of regions from north west to south east of the overthrust structure in the crystalline basement nappe Cretaceous strata . Wolf region in ductile shear zones measured over ~ 121-116Ma biotite ages may represent the deformation of the squeeze exercise time. It may be subject to Mongolia - Okhotsk closed, south Siberian Plate and North China plate collision impact , resulting in Wolf Mountain Region North West - South East crustal compression and shortening .

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