U-Pb Zircon Age,  Geochemistry and Geological Significance of the Late Silurian Diabase in the Southwest Margin of Tarim

WEI Bo; QI Qi; WANG Liwei; ZHANG Qi; WANG Weiping; FENG Minxuan

doi:10.12401/j.nwg.2024117

2025 Vol. 58, No. 2

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Article navigation > Northwestern Geology > 2025 > 58(2): 288-301

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WEI Bo, QI Qi, WANG Liwei, ZHANG Qi, WANG Weiping, FENG Minxuan. 2025. U-Pb Zircon Age, Geochemistry and Geological Significance of the Late Silurian Diabase in the Southwest Margin of Tarim. Northwestern Geology, 58(2): 288-301. doi: 10.12401/j.nwg.2024117

Citation:

WEI Bo, QI Qi, WANG Liwei, ZHANG Qi, WANG Weiping, FENG Minxuan. 2025. U-Pb Zircon Age, Geochemistry and Geological Significance of the Late Silurian Diabase in the Southwest Margin of Tarim. Northwestern Geology, 58(2): 288-301. doi: 10.12401/j.nwg.2024117

U-Pb Zircon Age, Geochemistry and Geological Significance of the Late Silurian Diabase in the Southwest Margin of Tarim

1.
Northwest Geological Exploration Institute of China Metallurgical Geology Bureau, Xi’an 710119, Shaanxi, China
2.
Xi'an Center of China Geological Survey/Northwest China Center for Geoscience Innovation, Xi’an 710119, Shaanxi, China

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Corresponding author: QI Qi, xqq8901@163.com

Received Date: 28 July 2023

Revised Date: 22 March 2024

Accepted Date: 03 December 2024

Publish Date: 20 April 2025

Abstract

Abstract

There are a large number of diabase dikes (walls) developed in the paleoproterozoic granite body and Setula Group in the Yecheng area of Tiekerike structural belt, southwestern margin of Tarim Basin. Through detailed geological, chronological, geochemical and tectonic environment studies, the results show that the diabases belong to the subbasic lapidous basalt series, with the characteristics of high Fe, Ti, Na and low K.The chondrite normalized REE patterns show the slightly enriched of LREE, which are right-sloping distribution. The diabases enrich LILEs and relatively loses HFSEs, resembling the feature of intraplate basalts. The study of lithogenesis showed that the diabases had the characteristics of a depleted lithospheric mantle source, and were mixed by subduction fluid or melt, and the original magma source area were mainly spinel dipyroxene peridotite. Diabases were formed in an intraplate tensioning environment. The LA-ICP-MS zircon U-Pb age of (424±2.7) Ma was obtained from diabase, formed in the Late Silurian, combined with the tectonic evolution of the West Kunlun region, it is believed that this period is in the post-orogenic stage, representing the end of the tectonic cycle of the original Proto-Tethyan Ocean. Diabases contain a large amount of inherited zircon, the first group inherits the zircon age of (2242±19) Ma, which indicates that there is a Paleoproterozoic crystalline basement in the Tiekerek block, and the second group inherits the zircon age of (1 842±42) Ma, representing the magmatic and tectonic records of late Paleoproterozoic Tarim Craton.
- Diabase /
- Western Kunlun /
- zircon U-Pb age /
- southwest margin of Tarim /
- former Proto-Tethyan ocean /
- Columbia supercontinent; southwest margin of Tarim

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References

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