Redefinition of the Jurassic Strata of the Mazha Tectonic Melange in West Kunlun

ZHANG Jie; CHEN Lin; HOU Ming-cai; KANG Kong-yue

Northwestern Geology > 2014 > 47(4): 105-113.

ZHANG Jie, CHEN Lin, HOU Ming-cai, et al. Redefinition of the Jurassic Strata of the Mazha Tectonic Melange in West Kunlun[J]. Northwestern Geology, 2014, 47(4): 105-113.

Citation:

ZHANG Jie, CHEN Lin, HOU Ming-cai, et al. Redefinition of the Jurassic Strata of the Mazha Tectonic Melange in West Kunlun[J]. Northwestern Geology, 2014, 47(4): 105-113.

Citation:

ZHANG Jie, CHEN Lin, HOU Ming-cai, et al. Redefinition of the Jurassic Strata of the Mazha Tectonic Melange in West Kunlun[J]. Northwestern Geology, 2014, 47(4): 105-113.

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Redefinition of the Jurassic Strata of the Mazha Tectonic Melange in West Kunlun

1. No.282 Geological Party, Sichuan Bureau of Geology for Nuclear Industry, De'yang 618000, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China

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Received Date: June 27, 2014
Revised Date: October 10, 2014
Available Online: July 28, 2022
Published Date: December 04, 2014

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Abstract

In the Yecheng County, there exists a set of coal-bearing sandy conglomerate formation in the Mazha tectonic mélange of West Kunlun. Shaanxi Geological Investigation Institute divided this formation into three units in the 1:250000 regional geological survey, i.e. Triassic (T, non-layered), Triassic Sailiyakedaban Group (TS), and early-middle Jurassic Yarkant Group (J_1-2Y). These clastic rocks were mainly intermountain molasses formed by orogenesis, but the contacts between all strata were faults. Except for the incomplete top and bottom, the sedimentary sequence and age of all strata were also without knowledge. By the measurement and analysis on the clastic rocks, and according to the rock assemblages and biostratigraphic characteristics, this set of coal-bearing sandy conglomerate can be redefined as early-middle Jurassic Yarkant Group which can be further divided into three units from the bottom to the top: the Shalitashi Formation (J₁s^), Yangye Formation (J₂y), and Targa Formation (J₂t). They were fluviolacustrine strata and sedimentary response to the early-middle Jurassic orogenesis in the tectonic mélange belt of West Kunlun.
- tectonic melange belt,
- Jurassic,
- redefinition,
- West Kunlun

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Redefinition of the Jurassic Strata of the Mazha Tectonic Melange in West Kunlun

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