EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION

WU Yu; CHEN Zhengle; CHEN Bailin; WANG Yong; MENG Lingtong; SUN Yue; HE Jiangtao; WANG Bin; ZHANG Wengao

doi:10.12090/j.issn.1006-6616.2019.25.03.028

Volume 25 Issue 3

Jun. 2019

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WU Yu, CHEN Zhengle, CHEN Bailin, et al., 2019. EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION. Journal of Geomechanics, 25 (3): 301-312. DOI: 10.12090/j.issn.1006-6616.2019.25.03.028

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EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION

doi: 10.12090/j.issn.1006-6616.2019.25.03.028

WU Yu^{1, 2, 3
,},
CHEN Zhengle^{2, 3, 4},
CHEN Bailin^{2, 3},
WANG Yong^{2, 3},
MENG Lingtong⁵,
SUN Yue⁴,
HE Jiangtao⁶,
WANG Bin^{2, 3},
ZHANG Wengao^{2, 3}

1.
Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
3.
The Laboratory of Dynamic Digenesis and Metallogenesis, Institute of Geomechanics, CAGS, Beijing 100081, China
4.
East China Institute of Technology, Nanchang 330013, Jiangxi, China
5.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
6.
Tianjin Center, China Geological Survey, Tianjin 300170, China

More Information

Received: 2018-12-26
Revised: 2019-04-10
Published: 2019-06-01

Abstract

Abstract

Hongliugou-Lapeiquan ophiolitic mélange belt, which is exposed in the northern margin of the Qinghai-Tibet Plateau, has been providing significant information for the deep study of Early Paleozoic tectonic framework and evolution of North Altun. On the basis of detailed geological mapping and structural analysis, ophiolitic mélange belt was divided into the following three sub-tectonic units from north to south:the north incoherent unit, the middle coherent unit and the south incoherent unit. There mainly develop a series of complex folds and thrust faults in the north and south incoherent units. The youngest stratum involved in the folds is formerly defined Middle-Late Ordovician silicalite. SHRIMP zircon U-Pb dating from a Syenite porphyry dyke, truncating the above folds, yielded a weighted mean age of 416.8±3.7 Ma. The gabbro and plagiogranite in the mélange are involved in the thrust fault and have U-Pb age of ca. 479~521 Ma and ca. 512.1~518.5 Ma, respectively. Meanwhile, one undeformed Bingou pluton intruding the thrust fault was dated at ca. 410.7~418.5 Ma. All of these results support that the age of the folds and thrust faults in the incoherent units are tightly constrained at the Middle Ordovician to early Devonian, implying that the deformation in the ophiolitic mélange are related to an intense compression during the subduction of the North Altyn ocean. In the south incoherent unit, the characteristics of folds, from north to south, developed from upright fold to reclined fold to overturned fold, revealing a progressive deformation assemblage associated with the top-to-the-NNE shearing. Combined with top-to-the-NNE thrust fault in the south incoherent unit, it is indicated that these folds and thrust faults are as the product of the SSW-ward subduction of the North Altun ocean. In addition, folds with axial surface dipping to NNE and top-to-the-SSE thrust faults are common in the north incoherent unit, implying that the North Altun ocean has also experienced NNE-ward subduction during the Early Paleozoic. Thus, it is proposed that the North Altun ocean is characterized by divergent double subduction.
- mélange,
- fold,
- thrust fault,
- tectonic evolution,
- Early Paleozoic,
- North Altun

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EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION

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EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION

doi: 10.12090/j.issn.1006-6616.2019.25.03.028

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