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Title: Indosinian high-strain deformation for the Yunkaidashan tectonic belt, south China : Kinematics and 40Ar/39Ar geochronological constraints
Authors: Wang, Yuejun
Fan, Weiming
Cawood, Peter Anthony
Ji, Shaocheng
Peng, Touping
Chen, Xinyue
Keywords: U-PB Geochronology
Southeastern China
Petrogenetic implications
Sedimentary records
Shiwandashan Basin
Jiangxi Province
Hunan Province
Orogenic belt
QE Geology
Issue Date: 14-Dec-2007
Citation: Wang , Y , Fan , W , Cawood , P A , Ji , S , Peng , T & Chen , X 2007 , ' Indosinian high-strain deformation for the Yunkaidashan tectonic belt, south China : Kinematics and 40 Ar/ 39 Ar geochronological constraints ' Tectonics , vol 26 , no. 6 , pp. TC6008 . , 10.1029/2007TC002099
Abstract: Structural and 40Ar/39Ar data from the Yunkaidashan Belt document kinematic and tectonothermal characteristics of early Mesozoic Indosinian orogenesis in the southern part of the South China Block. The Yunkaidashan Belt is tectonically divided from east to west into the Wuchuang-Sihui shear zone, Xinyi-Gaozhou block, and the Fengshan-Qinxi shear zone. Indosinian structural elements ascribed to the Indosinian orogeny include D2 and D3 deformation. The early D2 phase is characterized by folding and thrusting with associated foliation and lineation development, related to NW-SE transpression under amphibolite- to greenschist-facies conditions. This event is heterogeneously overprinted by D3 deformation characterized by a gentle-dipping S-3 foliation, subhorizontally to shallowly plunging L3 lineation, some reactived-D2 folds and low-angle normal faults. The D3 fabrics suggest a sinistral transtensional regime under greenschist-facies metamorphism. The timing of the D2 and D3 events have been constrained to the early to middle Triassic (similar to 248-220 Ma) and late Triassic (similar to 220-200 Ma) respectively on the basis of 40Ar/39Ar geochronology and regional geological relations. The change from oblique thrusting (D2) to sinistral transtension (D3) may reflect oblique convergence and crustal thickening followed by relaxation of the overthickened crust. In combination with the regional relations from Xuefengshan to Yunkaidashan and on to Wuyishan, the early phase of the Indosinian orogeny constituted a large-scale positive flower structure and is related to the intracontinental convergence during the assembly of Pangea in which the less competent South China Orogen was squeezed between the more competent North China and Indosinian Blocks.
Version: Publisher PDF
Status: Peer reviewed
ISSN: 0278-7407
Type: Journal article
Rights: Copyright 2007 by the American Geophysical Union. Published version also available from DOI:10.1029/2007TC002099
Appears in Collections:University of St Andrews Research
Geography & Geosciences Research
Earth and Environmental Sciences Research

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