The discovery of Devonian strata in Lanyang area, Danzhou, Hainan Province: Evidence from the zircon U-Pb ages

ZHAO Xiaoming; YAO Huazhou; PEI Yijun; HU Zailong; YUN Haijun; WANG Yang; ZHANG Renjie; HE Jinlan; LONG Wenguo; WU Nianwen

2020 Vol. 39, No. 6

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ZHAO Xiaoming, YAO Huazhou, PEI Yijun, HU Zailong, YUN Haijun, WANG Yang, ZHANG Renjie, HE Jinlan, LONG Wenguo, WU Nianwen. The discovery of Devonian strata in Lanyang area, Danzhou, Hainan Province: Evidence from the zircon U-Pb ages[J]. Geological Bulletin of China, 2020, 39(6): 818-826.

Citation:

ZHAO Xiaoming, YAO Huazhou, PEI Yijun, HU Zailong, YUN Haijun, WANG Yang, ZHANG Renjie, HE Jinlan, LONG Wenguo, WU Nianwen. The discovery of Devonian strata in Lanyang area, Danzhou, Hainan Province: Evidence from the zircon U-Pb ages[J]. Geological Bulletin of China, 2020, 39(6): 818-826.

The discovery of Devonian strata in Lanyang area, Danzhou, Hainan Province: Evidence from the zircon U-Pb ages

1.
Wuhan Center of China Geological Survey(Central South China Innovation Center for Geosciences), Wuhan 430223, Hubei, China
2.
Institute of Geological Survey, China University of Geoscicences, Wuhan 430074, Hubei, China
3.
Hainan Institute of Geological Survey, Haikou 460100, Hainan, China
4.
Hubei Geological Bureau, Wuhan 430022, Hubei, China

Received Date: 22 October 2019

Revised Date: 21 February 2020

Publish Date: 15 June 2020

Abstract

Abstract

The interbedded rock assemblage of grayish green metamorphic fine-grained sandstone, metasiltstone and dark gray slate is developed near Shangfankai Village, Lanyang Town, Danzhou City in the middle of Hainan Island.This rock assemblage overlies the gray metamorphic fine-grained sandstone intercalated with light gray medium-thick bedded crystalline limestone and dolomitic limestone, and underlies the interbedded strata of grayish-black carbonaceous slate, phyllite, and gray metamorphic fine-grained sandstone intercalated with thin bedded chert.Previously, this rock association was classified as Carboniferous Qingtianxia Formation.In this study, two sedimentary tuff beds were discovered in the lower part of this rock association.According to the zircon U-Pb age dating by LA-ICP-MS, 60 zircon of ²⁰⁶Pb /²³⁸U age are divided into four groups.The youngest group is 349~375 Ma, and the weighted average age of 365±3 Ma represents the time of the eruption.Therefore, the strata should be deposited in the Late Devonian.This is the first absolute age of Devonian on Hainan island.The tentaculitoid Polycylindrites, obtained in the crystalline limestone of Qingtianxia Formation near Shangfankai Village, indicate that the Middle-Late Devonian deposition existed in the Hainan Island.The stratigraphic sequence of the Late Paleozoic in the northern part of central Hainan Island was reclassified, which provides new ideas and evidence for the study of eastward extension of the Paleo-Tethys Ocean and tectonic evolution.
- sedimentary tuff /
- zircon U-Pb age /
- Devonian /
- tentaculitoid /
- Hainan Island

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References

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