Tectonic Setting and Provenance of Sandstones from Triassic Daheba Formation in the West Qinling Orogenic Belt

LI Kangning; TANG Qingyan; LUAN Xiaogang; WANG Yuxi; DENG Xiaohua; YANG Zongfeng

doi:10.12401/j.nwg.2024035

2024 Vol. 57, No. 3

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LI Kangning, TANG Qingyan, LUAN Xiaogang, WANG Yuxi, DENG Xiaohua, YANG Zongfeng. 2024. Tectonic Setting and Provenance of Sandstones from Triassic Daheba Formation in the West Qinling Orogenic Belt. Northwestern Geology, 57(3): 113-127. doi: 10.12401/j.nwg.2024035

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LI Kangning, TANG Qingyan, LUAN Xiaogang, WANG Yuxi, DENG Xiaohua, YANG Zongfeng. 2024. Tectonic Setting and Provenance of Sandstones from Triassic Daheba Formation in the West Qinling Orogenic Belt. Northwestern Geology, 57(3): 113-127. doi: 10.12401/j.nwg.2024035

Tectonic Setting and Provenance of Sandstones from Triassic Daheba Formation in the West Qinling Orogenic Belt

1.
1 1. 兰州大学地质科学与矿产资源学院，甘肃兰州　730000
1.
1 ¹School of Earth Sciences, Lanzhou University, Lanzhou 730000, Gansu, China
2.
2 2. 甘肃省地质矿产勘查开发局第三地质矿产勘查院，甘肃兰州　730050
2.
2 ²Third Institute Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou 730050, Gansu, China
3.
3 3. 夏河县冰华矿业有限责任公司，甘肃甘南　747100
3.
3 ³Binghua Mining Limited Liability Company of Xiahe County, Gannan 747100, Gansu, China
4.
4 4. 长安大学地球科学与资源学院，陕西西安　710064
4.
4 ⁴School of Earth Science and Resources, Chang’an University,Xi’an 710064, Shaanxi, China

Fund Project: 甘肃省重点人才项目（2023）“金川超大型铜镍硫化物矿床钴元素赋存状态及成矿机制研究”，自然资源部黄河上游战略性矿产资源重点实验室开放课题资助项目（YSMRKF202201），甘肃省科技计划（22YF7GA050），甘肃省地质勘查基金项目（202202-D01），甘肃省自然资源厅科技创新项目（202201）联合资助

Received Date: 01 May 2023

Revised Date: 19 March 2024

Accepted Date: 25 March 2024

Publish Date: 20 June 2024

Abstract

Abstract

The Daheba formation is the latest strata exposed in the Xiahe-Luqu area of the West Qinling Orogenic Belt (WQOB), with recording the Indosinian regression event. In this study, based on the stratigraphic sequence characteristics, major and trace element compositions and zircon U-Pb dating of the sandstone, we traced the origin of the sandstone and explored the tectonic settings of the Daheba Formation. The Daheba Formation consists of feldspar sandstone, lithic feldspar sandstone, conglomerate clastic feldspar sandstone. The SiO₂ content of sandstone range from 64.11% to 68.72% with an average of 65.45%. The sandstones are also characterized by high Al₂O₃ (13.61%～15.19%), lower Fe₂O₃ (0.82%～1.72%), CaO (2.393%～3.32%) and MgO (0.06%～0.1%) contents. They have high rare earth elements (REE) range from 184.13×10⁻⁶ to 434.06×10⁻⁶, and show negative Eu anomaly in the chondrite normalized diagram. They also have similar Th, Zr, Ti, and Co, Ni compositions with that of active continental margin sediments. The detrital zircon U-Pb ages from the sandstones are mainly concentrated in 253.3～448.7 Ma, 1536～2067 Ma and 2204～2520 Ma, and show five age peaks at 278.2 Ma, 448.5 Ma, 1757.6 Ma, 1986.4 Ma and 2445 Ma, with the youngest ages at 253.3 Ma. These indicates that the Daheba Formation was deposited in an active continental margin setting, and the detritus originated from the upper crust igneous rocks. The main sources for the detritus is possibly of the basement of the northern Qinling, the eastern part of the Qilian, and the southern edge of the North China Plate in the northern parts of the study area with small parts from the magmatic rocks and polycyclic sediments in the West Qinling.

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