Macro- and microstructural analysis of the Zhujiafang ductile shear zone, Hengshan Complex: Tectonic nature and geodynamic implications of the evolution of Trans-North China orogen

He Lingchao; Zhang Jian; Zhao Guochun; Yin Changqing; Qian Jiahui; Liu Jin; Liu Xiaoguang; Zhao Chen

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Macro- and microstructural analysis of the Zhujiafang ductile shear zone, Hengshan Complex: Tectonic nature and geodynamic implications of the evolution of Trans-North China orogen

机译：衡山复合体珠娇芳氏韧带剪力区的宏观和微观结构分析：跨北造山虫演化的构造性质和地球动力学意义

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In worldwide orogenic belts, crustal-scale ductile shear zones are important tectonic channels along which the orogenic root (i.e., high-grade metamorphic lower-crustal rocks) commonly experienced a relatively quick exhumation or uplift process. However, their tectonic nature and geodynamic processes are poorly constrained. In the Trans-North China orogen, the crustal-scale Zhujiafang ductile shear zone represents a major tectonic boundary separating the upper and lower crusts of the orogen. Its tectonic nature, structural features, and timing provide vital information into understanding this issue. Detailed field observations showed that the Zhujiafang ductile shear zone experienced polyphase deformation. Variable macro- and microscopic kinematic indicators are extensively preserved in the highly sheared tonalite-trondhjemite-granodiorite (TTG) and supracrustal rock assemblages and indicate an obvious dextral strike-slip and dip-slip sense of shear. Electron backscattered diffraction (EBSD) was utilized to further determine the crystallographic preferred orientation (CPO) of typical rock-forming minerals, including hornblende, quartz, and feldspar. EBSD results indicate that the hornblendes are characterized by (100) <001> and (110) <001> slip systems, whereas quartz grains are dominated by prism prism slip systems, suggesting an approximate shear condition of 650-700 degrees C. This result is consistent with traditional thermobarometry pressure-temperature calculations implemented on the same mineral assemblages. Combined with previously reported metamorphic data in the Trans-North China orogen, we suggest that the Zhujiafang supracrustal rocks were initially buried down to similar to 30 km depth, where high differential stress triggered the large-scale ductile shear between the upper and lower crusts. The high-grade lower-crustal rocks were consequently exhumed upwards along the shear zone, synchronous with extensive isothermal decompression metamorphism. The timing of peak collision-related crustal thickening was further constrained by the ca. 1930 Ma metamorphic zircon ages, whereas a subsequent exhumation event was manifested by ca. 1860 Ma syntectonic granitic veins and the available Ar-Ar ages of the region. The Zhujiafang ductile shear zone thus essentially record an integrated geodynamic process of initial collision, crustal thickening, and exhumation involved in formation of the Trans-North China orogen at 1.9-1.8 Ga.

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来源
 《Geological Society of America Bulletin》 |2021年第6期|共19页
作者
He Lingchao; Zhang Jian; Zhao Guochun; Yin Changqing; Qian Jiahui; Liu Jin; Liu Xiaoguang; Zhao Chen;
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作者单位

Sun Yat Sen Univ Sch Earth Sci &

Engn Guangdong Prov Key Lab Mineral Resources &

Geol P Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci &

Engn Guangdong Prov Key Lab Mineral Resources &

Geol P Guangzhou 510275 Peoples R China;

Univ Hong Kong Dept Earth Sci Pokfulam Rd Hong Kong Peoples R China;

Sun Yat Sen Univ Sch Earth Sci &

Engn Guangdong Prov Key Lab Mineral Resources &

Geol P Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci &

Engn Guangdong Prov Key Lab Mineral Resources &

Geol P Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci &

Engn Guangdong Prov Key Lab Mineral Resources &

Geol P Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci &

Engn Guangdong Prov Key Lab Mineral Resources &

Geol P Guangzhou 510275 Peoples R China;

Sun Yat Sen Univ Sch Earth Sci &

Engn Guangdong Prov Key Lab Mineral Resources &

Geol P Guangzhou 510275 Peoples R China;

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正文语种 eng
中图分类地质学;
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机译：补充材料：横山复合体朱家芳剪力区宏观，微观结构分析：跨北造山虫演化的构造性质与地球动力学含义

Macro- and microstructural analysis of the Zhujiafang ductile shear zone, Hengshan Complex: Tectonic nature and geodynamic implications of the evolution of Trans-North China orogen

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