|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2 Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo 152-8511, Japan
3 School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
4 Department of Geology, Jiaozuo Institute Polytechnic, Jiaozuo 454100, China
5 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
A newly defined, 250 km by 500 km, Carboniferous-Triassic subduction-accretion complex, the Mazar accretionary prism in the western Kunlun, comprises two subduction complexes and a forearc-basin succession. (1) The Bazar Dara subduction complex contains imbricated blocks of sandstone, arenite, limestone, and metavolcanic rocks in a matrix of weakly metamorphosed Triassic deep-sea turbidites. The metavolcanic rocks include basalt, diabase, spilite, and andesitic porphyry. Trace element geochemistry shows that pillow and amygdaloidal basalts are oceanic-island tholeiites. This zone has Ordovician to Permian fossils and is situated on the older, more highly deformed and metamorphosed side of the prism adjacent to the Sailiyak magmatic arc. (2) The Heweitan subduction complex is composed of blocks of limestone, turbidite, and radiolarite in a slate-phyllite matrix intercalated with calc-alkalic volcanic rocks. This complex has Permian to Triassic fossils and is situated on the younger, less deformed, and metamorphosed side of the prism adjacent to the suture zone. (3) The Qitai forearc basins are infilled with turbidites (Late Triassic) intercalated with carbonates; these rocks overlie the accretionary prism. The accretion-related structure is dominated by large-scale northeast-dipping thrusts and subvertical cleavage stitched by 215–190 Ma granites. There is an overall decrease in metamorphic grade and deformation intensity from the arc to the suture zone across the Bazar Dara and Heweitan subduction complexes. The Mazar accretionary prism formed by subduction-accretion processes during closure of the Paleotethyan Ocean and the final docking of the Gondwanan Karakoram-Qiangtang block to the Cathaysian (Eurasian) Kunlun block.
Key Words: western Kunlun • accretionary prism • subduction • accretion • arc
This article has been cited by other articles:
|
|
 |
|
  A. C. Robinson, A. Yin, C. E. Manning, T. M. Harrison, S.-H. Zhang, and X.-F. Wang Cenozoic evolution of the eastern Pamir: Implications for strain-accommodation mechanisms at the western end of the Himalayan-Tibetan orogen Geological Society of America Bulletin, July 1, 2007; 119(7-8): 882 - 896. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Z. Yan, Z. Wang, T. Wang, Q. Yan, W. Xiao, and J. Li Provenance and Tectonic Setting of Clastic Deposits in the Devonian Xicheng Basin, Qinling Orogen, Central China Journal of Sedimentary Research, March 1, 2006; 76(3): 557 - 574. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. P. M. Vaughan and R. A. Livermore Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions Geological Society, London, Special Publications, January 1, 2005; 246(1): 143 - 178. [Abstract] [PDF]
|
|
|
|
|
|
A. C. Robinson, A. Yin, C. E. Manning, T. M. Harrison, S.-H. Zhang, and X.-F. Wang Tectonic evolution of the northeastern Pamir: Constraints from the northern portion of the Cenozoic Kongur Shan extensional system, western China Geological Society of America Bulletin, July 1, 2004; 116(7-8): 953 - 973. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W.-J. Xiao, L.-C. Zhang, K.-Z. Qin, S. Sun, and J.-L. Li Paleozoic accretionary and collisional tectonics of the eastern Tianshan (China): Implications for the continental growth of central Asia Am J Sci, April 1, 2004; 304(4): 370 - 395. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Late Paleozoic depositional history of the Tarim basin, northwest China: An integration of biostratigraphic and lithostratigraphic constraints AAPG Bulletin, August 1, 2003; 87(8): 1323 - 1354.
|
|
|
|
 |
|
 null Xiao Wenjiao, W. XIAO, BRIANF. WINDLEY, J. HAO, and J. LI Arc-ophiolite obduction in the Western Kunlun Range (China): implications for the Palaeozoic evolution of central Asia Journal of the Geological Society, September 1, 2002; 159(5): 517 - 528. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
