Structural styles and chronological sequence of the Mianyuzui ductile strike-slip fault along the Shangdan suture Zone: Implications for the Paleozoic tectonic evolution of the Qinling Orogenic Belt, China

被引：0

作者：

Sheir, Falak ^{[1
]}

Li, Wei ^{[1
]}

Zhang, Le ^{[1
]}

Baz, Shair ^{[2
]}

Jiang, Liuqing ^{[1
]}

Liang, Li ^{[1
]}

Wang, Chao ^{[1
]}

Feng, Zhanwei ^{[1
]}

Rehman, Adnanul ^{[3
]}

机构：

[1] Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Northern Taibai Str 229, Xian 710069, Peoples R China

[2] Guilin Univ Technol, Guangxi Key Lab Hidden Met Ore Deposits Explorat, Guilin 541004, Peoples R China

[3] Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China

来源：

JOURNAL OF ASIAN EARTH SCIENCES | 2024年 / 268卷

基金：

中国国家自然科学基金;

关键词：

Qinling Orogenic Belt; Shangdan Suture Zone; Paleozoic tectonic evolution; Deformations; Chronology; ZIRCON U-PB; SOUTH CHINA; NORTH CHINA; TONGBAI OROGEN; COLLISION; CONSTRAINTS; AGES; GEOCHRONOLOGY; GEOCHEMISTRY; DEFORMATION;

D O I：

10.1016/j.jseaes.2024.106163

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Shangdan suture zone (SDSZ) subdivides the Qinling Orogenic Belt into North Qinling and South Qinling belts, marking the main tectonic boundary between the North China and South China Blocks. The Mianyuzi ductile strike-slip fault (MYZF) within the SDSZ separates the North China Block from the South China Block and contains valuable collisional information. This paper integrates the structural and geochronological data of the MYZF to investigate the Paleozoic tectonic evolution of the Qinling Orogenic Belt and the collision between the North China and South China Blocks. Two phases of deformation (D1-D2a-b) are identified along the southern boundary of the SDSZ. The metamorphic temperature of mylonites is - 600-700 degrees C for the early stage and 300-500 degrees C for the late stage of shearing deformation. U-Pb zircon analysis of the mylonites and diabase dike in the ductile shear reveals that zircons have major younger protolith populations at 480-460 Ma, 450-430 Ma, and 405-425 Ma, which suggests that rocks were probably derived from the North Qinling belt. The metamorphism and deformation cooling age from the MYZF have been constrained to be 339-328 Ma and 259 +/- 1.6 Ma using UPb and 40Ar/39Ar dating. Combined with previously published data, we concluded that the subduction of the Shangdan Ocean was active until the Early Silurian and subsequent collisions occurred during the Late Silurian. Meanwhile, the shearing might have been related to the intraplate extension-exhumation during the Carboniferous-Late Permian in the Qinling Orogenic Belt.

引用

页数：15