U-Pb age and Hf isotope composition of detrital zircons from the Chengjiang Formation in Dongchuan area, Yunnan Province of the western Yangtze Block and its constraints on provenance and crustal evolution

GAO Yongjuan; LIN Shiliang; QIN Yadong; REN Guangming; PANG Weihua; LOU Xiongying

2021 Vol. 40, No. 11

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GAO Yongjuan, LIN Shiliang, QIN Yadong, REN Guangming, PANG Weihua, LOU Xiongying. U-Pb age and Hf isotope composition of detrital zircons from the Chengjiang Formation in Dongchuan area, Yunnan Province of the western Yangtze Block and its constraints on provenance and crustal evolution[J]. Geological Bulletin of China, 2021, 40(11): 1943-1956.

Citation:

GAO Yongjuan, LIN Shiliang, QIN Yadong, REN Guangming, PANG Weihua, LOU Xiongying. U-Pb age and Hf isotope composition of detrital zircons from the Chengjiang Formation in Dongchuan area, Yunnan Province of the western Yangtze Block and its constraints on provenance and crustal evolution[J]. Geological Bulletin of China, 2021, 40(11): 1943-1956.

U-Pb age and Hf isotope composition of detrital zircons from the Chengjiang Formation in Dongchuan area, Yunnan Province of the western Yangtze Block and its constraints on provenance and crustal evolution

Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China

Received Date: 05 May 2021

Revised Date: 23 June 2021

Publish Date: 15 November 2021

Abstract

Abstract

The Chengjiang Formation is one of the earliest stratigraphic units above the Jinning unconformity.Determining the sources is of great significance for the understanding of the early crustal evolution in the western Yangtze Block.U-Pb dating and Lu-Hf isotopic composition studies were carried out on the detrital zircons from the Lower Chengjiang Formation in the Dongchuan area of the western Yangtze Block.The U-Pb ages of the zircons are clustered at 780~900 Ma, ~1000 Ma and~1800 Ma respectively, and the weighted mean age of the youngest group is 801±5 Ma(MSWD=2.4, n=9), which is consistent with the volcanic age of the Lower Chengjiang Formation.Thus, it is further confirmed that the lower age of the Chengjiang Formation should be limited at~800 Ma.Combined with the U-Pb age and Hf isotopic composition, zircon morphology and paleogeography, it is believed that the detritus was largely sourced from the widely distributed Neoproterozoic magmatic rock in the western Yangtze Block, and a small part from the recycled materials of the Dongchuan Group.Regional comparison of the early Nanhua strata of the Yangtze Block indicates that the western and northern margins of the Yangtze Block show different crustal evolution history.The provenance differences of the Chengjiang Formation in different regions of the western margin of the Yangtze are closely related to regional tectonic activities.
- western Yangtze Block /
- Chengjiang Formation /
- detrital zircon /
- Hf isotope /
- crustal evolution /
- Dongchuan

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