Journal
JOURNAL OF ASIAN EARTH SCIENCES
Volume 29, Issue 2-3, Pages 243-252Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2006.03.002
Keywords
offset; geochronology; Altyn Strike-Slip Fault; 40Ar/39Ar dating; western China
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40Ar/39Ar dating studies have been carried out along the Dangiin Pass transect across the Altyn Strike-Slip Fault (ASSF). The samples gave ages of 445.2-454.3 Ma in the Northern Belt, 164.3-178.4 Ma in the Mesozoic Shear Zone and 26.3-36.4 Ma in the Cenozoic Shear Zone. Using the piercing point of the Bashikaogong Fault and the Cangma-Heihe Fault an offset of 350-400 kin along the ASSF has been estimated. The 40Ar/39Ar dating of the syntectonic-growth or syntectonic-resetting minerals from the samples within the ASSF belt, and offset estimations from different age piercing points suggest that the ASSF should be initiated in the Middle Jurassic (178.4-160 Ma). Combined with previously reported ages, our studies show that the ASSF is characterized by multi-phase re-activation during 85-100, 25-40 and 8-10 Ma following its initiation in the Middle Jurassic in the regional tectonic setting of convergence between the Indian and Eurasian continents. (c) 2006 Elsevier Ltd. All rights reserved.
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