Metamorphic evolution of high-pressure felsic and pelitic granulites from the Qianlishan Complex and tectonic implications for the Khondalite Belt, North China Craton

Wu Shangjing; Yin Changqing; Davis Donald W.; Zhang Jian; Qian Jiahui; Qiao Hengzhong; Xia Yanfei; Liu Jingna

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Metamorphic evolution of high-pressure felsic and pelitic granulites from the Qianlishan Complex and tectonic implications for the Khondalite Belt, North China Craton

机译：高压雀科和鹈鹕粒子的变质演变，从千代南康星群岛克隆岩群中的复合群和构造影响

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High-pressure felsic granulites in association with pelitic granulites are widely distributed in the Qianlishan Complex of the Khondalite Belt, North China Craton. A link between "inter-layered" felsic and pelitic granulites was established based on comprehensive metamorphic analysis, revealing that they record similar metamorphic stages: peak pressure (M-1), post-peak decompression (M-2), and late retrograde cooling (M-3) stages. Felsic granulites experienced high-pressure metamorphism up to similar to 12 kbar, while pelitic granulites estimated peak pressure is 11-15 kbar. The decompression stage (M-2) is indicated by cordierite + sillimanite symplectite and/or cordierite coronae with conditions of 5.7-6.5 kbar/800-835 degrees C in pelitic granulites, and by garnet-sillimanite assemblages with conditions of >6.5 kbar/810-865 degrees C in felsic granulites. The later cooling stage (M-3) is marked by sub-solidus biotite-quartz-plagioclase symplectite and later melt crystallization. These mineral assemblages and pressure-temperature (P-T) conditions define clockwise P-T paths involving near-isothermal decompression and near-isobaric cooling, suggesting a continent-continent collisional event. Secondary ion mass spectrometry zircon U-Pb dating yields a consistent metamorphic age of ca. 1.95 Ga, interpreted as peak metamorphism. The results, combined with available data, suggest that the Khondalite Belt formed by collision between the Yinshan and Ordos blocks at ca. 1.95 Ga.

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《Geological Society of America Bulletin》 |2020年第12期|共14页
作者
Wu Shangjing; Yin Changqing; Davis Donald W.; Zhang Jian; Qian Jiahui; Qiao Hengzhong; Xia Yanfei; Liu Jingna;
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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 Toronto Dept Earth Sci Toronto ON M5S 3B1 Canada;

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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Metamorphic evolution of high-pressure felsic and pelitic granulites from the Qianlishan Complex and tectonic implications for the Khondalite Belt, North China Craton

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