江南造山带中段冷家溪群沉积物源及构造背景：以岳阳地区黄浒洞组为例

田洋; 金巍; 王晶; 柯贤忠; 龙文国

doi:10.3799/dqkx.2020.101

Volume 46 Issue 4

Apr. 2021

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Tian Yang, Jin Wei, Wang Jing, Ke Xianzhong, Long Wenguo, 2021. Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area. Earth Science, 46(4): 1328-1348. doi: 10.3799/dqkx.2020.101

Citation:

Tian Yang, Jin Wei, Wang Jing, Ke Xianzhong, Long Wenguo, 2021. Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area. Earth Science, 46(4): 1328-1348. doi: 10.3799/dqkx.2020.101

Citation:

Tian Yang, Jin Wei, Wang Jing, Ke Xianzhong, Long Wenguo, 2021. Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area. Earth Science, 46(4): 1328-1348. doi: 10.3799/dqkx.2020.101

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Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area

doi: 10.3799/dqkx.2020.101

1.
Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Hubei Key Laboratory of Paleontology and Geological Environment Evolution, Wuhan 430205, China

Received Date: 2020-04-02
Publish Date: 2021-04-15

Abstract

Abstract

For revealing provenance and tectonic setting of Lengjiaxi Group in the central Jiangnan orogen, a synthetic study on petrology, sedimentology, geochemistry and zircon geochronology of Huanghudong Formation in Yueyang area was carried out. All greywacke samples are rich in matrix (mostly more than 25%), feldspar (15%-25%) and lithic fragments (15%-30%), poor in quartz (25%-40%), with poor sorting and poor-medium rounding. These samples are characterized by medium SiO₂(63.39%-72.88%, mean: 70.14%) contents, high (Fe₂O₃^T+MgO)* (6.04%-8.29%, mean: 6.81%) and TiO₂* (0.67%-0.92%, mean: 0.74%) contents, high K₂O/Na₂O (0.84-2.35, mean: 1.43) ratios, and low Al₂O₃/SiO₂ (0.17-0.28, mean: 0.20) ratios, resembling those of continental island arc greywackes. Their medium index of compositional variation (ICV, mean: 0.86) and chemical index of alteration values (CIA, mean: 70-80) demonstrate that the source contains recycled ancient sediments and first-cycle materials which underwent moderate chemical weathering. Greywackes have high contents in ΣREE (mean: 173.02×10^-6), with chondrite-normalized REE patterns similar to upper crust and PAAS, showing enriched LREE ((La/Yb)_N mean: 7.32), subhorizontal HREE curves and moderate Eu (Eu/Eu*: 0.58-0.70, mean: 0.66) negative anomalies. However, compared to the upper crust, greywackes HREE contents are significantly enriched with an average (La/Yb)_ucc value of 0.70. LA-ICP-MS zircon U-Pb dating of one layered tuff sample yields zircon U-Pb age of 824±3.1 Ma. Low textural and compositional maturity, NEE-SE paleocurrent, contents and ratios of characteristic elements, provenance and tectonic discrimination diagrams of Huanghudong Formation greywackes, and combined with other geological observations, suggest that the Lengjiaxi Group of Yueyang area in the central Jiangnan orogen might be formed in a back-arc basin. The sources are of high compositional maturity from interior Yangtze block in stable tectonic setting in the north, and of low compositional maturity from continental island arc with strong tectonic activity in the south, respectively.
- provenance,
- tectonic setting,
- geochemistry,
- Lengjiaxi Group,
- Jiangnan orogen

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Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area

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