Recognition of metamorphic conglomerate in the Sanya area of Hainan Island and its indicator to breakup of the Columbia supercontinent

ZHAO Xiaoming; HU Zailong; PEI Yijun; YUAN Haijun; QIU Xiaofei; WU Nianwen; YAO Huazhou

2021 Vol. 40, No. 6

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ZHAO Xiaoming, HU Zailong, PEI Yijun, YUAN Haijun, QIU Xiaofei, WU Nianwen, YAO Huazhou. Recognition of metamorphic conglomerate in the Sanya area of Hainan Island and its indicator to breakup of the Columbia supercontinent[J]. Geological Bulletin of China, 2021, 40(6): 880-888.

Citation:

ZHAO Xiaoming, HU Zailong, PEI Yijun, YUAN Haijun, QIU Xiaofei, WU Nianwen, YAO Huazhou. Recognition of metamorphic conglomerate in the Sanya area of Hainan Island and its indicator to breakup of the Columbia supercontinent[J]. Geological Bulletin of China, 2021, 40(6): 880-888.

Recognition of metamorphic conglomerate in the Sanya area of Hainan Island and its indicator to breakup of the Columbia supercontinent

1.
Wuhan Center, China Geological Survey/Central South China Innovation Center for Geosciences, Wuhan 430223, Hubei, China
2.
Hainan Institute of Geological Survey, Haikou 570206, Hainan, China
3.
Institute of Geological Survey, China University of Geoscicences, Wuhan 430074, Hubei, China

Received Date: 19 June 2020

Revised Date: 17 July 2020

Publish Date: 15 June 2021

Abstract

Abstract

Mesoproterozoic sedimentary records in the Hainan Island are significant for discussing the continental crust evolution of the South China Massif.In our studies, the formation age of metamorphic conglomerate in the sandstone-slate combination of the Ordovician Gangoucun Formation in the Sanlangling area of the Sanya city, Hainan Island, were redetermined.Total 65 detrital zircons from the conglomerate were measured for U-Pb dating.The U-Pb ages of the zircons range from 2691 Ma to 1350 Ma, and are clustered at 2691~2444 Ma, 1838~1632 Ma, and 1540~1350 Ma, with two main peaks at ~1699 Ma and ~1440 Ma and a subordinary peak at ~2461 Ma.Based on the youngest detrital zircon age of ~1350 Ma for the conglomerate, without 1250~1100 Ma and 1000~900 Ma age records which are common in the Hainan Island, it is suggested that the metamorphic conglomerate was deposited at 1350~1250 Ma.This is the first time that a Mesoproterozoic conglomerate formation has been recognized on Hainan Island, rather than the Ordovician sedimentary rocks previously classified.The metamorphic conglomerates have high compositional maturity and middle texture maturity, which are consistent with the sedimentary features of high-density debris flow in the rift basin.They might represent the sedimentary response to the final breakup of the Columbia supercontinent in the Hainan Island.
- metamorphic conglomerate /
- zircon U-Pb age /
- Columbia supercontinent breakup /
- Mesoproterozoic /
- Hainan Island

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References

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