Paleoproterozoic metamorphic event in the nucleus of the Yangtze craton:Evidence from U-Pb geochronology of the metamorphic zircons from the khondalite

QIU Xiaofei; ZHAO Xiaoming; YANG Hongmei; WEI Yunxu; WU Nianwen; LU Shansong; JANG Tuo; PENG Lianhong

2017 Vol. 36, No. 5

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QIU Xiaofei, ZHAO Xiaoming, YANG Hongmei, WEI Yunxu, WU Nianwen, LU Shansong, JANG Tuo, PENG Lianhong. Paleoproterozoic metamorphic event in the nucleus of the Yangtze craton:Evidence from U-Pb geochronology of the metamorphic zircons from the khondalite[J]. Geological Bulletin of China, 2017, 36(5): 706-714.

Citation:

QIU Xiaofei, ZHAO Xiaoming, YANG Hongmei, WEI Yunxu, WU Nianwen, LU Shansong, JANG Tuo, PENG Lianhong. Paleoproterozoic metamorphic event in the nucleus of the Yangtze craton:Evidence from U-Pb geochronology of the metamorphic zircons from the khondalite[J]. Geological Bulletin of China, 2017, 36(5): 706-714.

Paleoproterozoic metamorphic event in the nucleus of the Yangtze craton:Evidence from U-Pb geochronology of the metamorphic zircons from the khondalite

1.
Isotope Geochemistry Laboratory, Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China
2.
Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430205, Hubei, China

Received Date: 18 January 2016

Revised Date: 28 June 2016

Publish Date: 25 May 2017

Abstract

Abstract

Apart from the Archean metamorphic crystal basement, a series of khondalite-bearing graphites and Al-rich minerals are exposed in the Kongling Complex.However, relative to the study of metamorphic crystal basement, geochronological studies of the supracrustal rocks are still very insufficient.In this study, the LA-ICP-MS zircon U-Pb study was carried out for the typical samples of garnet-sillimanite quartzite in the khondalite series.The result shows that the garnet-sillimanite-quartzite was metamorphosed at 1964±12Ma.Combined with the documented zircon U-Pb geochronologic data, the authors hold that the khondalite-series in the Kongling Complex was deposited at 2.1~2.0Ga.The Paleoproterozoic metamorphism and magmatism recognized in the interior of the Yangtze craton are consistent with the worldwide coeval collision-related orogenic event during 2.1~1.8Ga, indicating that this event may have been an important component in the Columbia supercontinent.
- Yangtze craton /
- Kongling Complex /
- khondalites /
- zircon U-Pb geochronology /
- tectonic evolution

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References

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