思茅地块西缘大凹子组地层序列及地质时代

魏月华; 甘正勤; 刘桂春; 冯庆来

doi:10.3799/dqkx.2020.066

Volume 46 Issue 2

Feb. 2021

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Wei Yuehua, Gan Zhengqin, Liu Guichun, Feng Qinglai, 2021. The Stratigraphic Sequence and Geological Time of Dawazi Formation in Western Simao Block. Earth Science, 46(2): 418-431. doi: 10.3799/dqkx.2020.066

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Wei Yuehua, Gan Zhengqin, Liu Guichun, Feng Qinglai, 2021. The Stratigraphic Sequence and Geological Time of Dawazi Formation in Western Simao Block. Earth Science, 46(2): 418-431. doi: 10.3799/dqkx.2020.066

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The Stratigraphic Sequence and Geological Time of Dawazi Formation in Western Simao Block

doi: 10.3799/dqkx.2020.066

Wei Yuehua^{1, 2
,
,},
Gan Zhengqin^{1, 2},
Liu Guichun^{1, 3},
Feng Qinglai^{1, 2
,
,
,}

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Yunnan Institute of Geological Survey, Kunming 650216, China

Received Date: 2020-03-05
Publish Date: 2021-02-15

Abstract

Abstract

There are great controversies in the time of Dawazi Formation located at the edges of western Simao Block. Siliceous rocks, sandstones and volcanic rocks in Dazhonghe Section, western Simao Block were selected to research the geological time by the radiolarian assemblage and zircon U-Pb age, and reconstruct the stratigraphic sequence. Dazhonghe Section is a fragment stratum system composed of six different lithologic strata fragments, through the detailed section measurement. The first and forth fragments are characterized by radiolaria-bearing siliceous rocks, and the radiolarian assemblage indicates that the geological age is from Late Devonian to Early Carboniferous. The second and fifth fragments are dominated by pyroclastic rocks and pyroclastic sedimentary rocks with Bouma sequence characteristics. The U-Pb isotope ages of the zircons indicate that the geological age is from the Middle Silurian to the Early Devonian. The third and sixth fragments are characterized by volcanic rock deposition, and the U-Pb isotope age of zircons indicates that the geological age is the Early Silurian. Combined with the previous data, it is believed that the stratigraphic sequences of marine volcanic rocks, clastic rocks and radiolarian-bearing siliceous rocks distributed in the western margin of Simao Block represent the island-arc volcanic-sedimentary stratigraphic sequences from Silurian to Early Carboniferous.
- Simao Block,
- Dawazi Formation,
- zircon U-Pb age,
- radiolarian,
- stratigraphic sequence reconstruction,
- Tethyan evolution,
- geochronology

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References(52)

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The Stratigraphic Sequence and Geological Time of Dawazi Formation in Western Simao Block

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