Zircon U-Pb Geochronology and Tectonic Settings of Neoproterozoic Lamprophyre in Southern Yangtze Block

DUAN Qi-Fa，Cao Liang，ZHOU Yun，WU Nian-Wen，ZOU Xian-Wu，FANG Xi-Lin; ${author.authorNameEn}; ${author.authorNameEn}; ${author.authorNameEn}; ${author.authorNameEn}; ${author.authorNameEn}

doi:10.3969/j.issn.2097-0013.2022.04.002

2022 Vol. 38, No. 4

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DUAN Qi-Fa，Cao Liang，ZHOU Yun，WU Nian-Wen，ZOU Xian-Wu，FANG Xi-Lin, . 2022. Zircon U-Pb Geochronology and Tectonic Settings of Neoproterozoic Lamprophyre in Southern Yangtze Block. South China Geology, 38(4): 583-595. doi: 10.3969/j.issn.2097-0013.2022.04.002

Citation:

DUAN Qi-Fa，Cao Liang，ZHOU Yun，WU Nian-Wen，ZOU Xian-Wu，FANG Xi-Lin, . 2022. Zircon U-Pb Geochronology and Tectonic Settings of Neoproterozoic Lamprophyre in Southern Yangtze Block. South China Geology, 38(4): 583-595. doi: 10.3969/j.issn.2097-0013.2022.04.002

Zircon U-Pb Geochronology and Tectonic Settings of Neoproterozoic Lamprophyre in Southern Yangtze Block

DUAN Qi-Fa，Cao Liang，ZHOU Yun，WU Nian-Wen，ZOU Xian-Wu，FANG Xi-Lin^1,2,
^1,2,
^1,2,
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1. Wuhan Center, China Geological Survey (Central South China Innovation Center for Geosciences), Wuhan 430205, Hubei, China
2. Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey，Wuhan 430205, Hubei, China
3. Second Geological Brigade of Hubei Geological Bureau, Enshi 445000, Hubei, China

Received Date: 01 September 2022

Revised Date: 30 October 2022

Abstract

Abstract

Hefeng lamprophyre, as the only intrusion in southwestern Hubei province, is tectonically located in the northern margin of the Jiangnan orogenic belt and the southern part of the Yangtze Block. LA-ICP-MS U-Pb dating and trace element testing on zircons of Hefeng lamprophyre are used to determine its formation age and discuss its tectonic environment in this paper. The results show that: (1) The ²⁰⁶Pb/²³⁸U weighted average age of the intrusion is 839 ± 5 Ma (MSWD=2.1, n=24), indicating it had intruded in Neoproterozoic; (2) The zircons in intrusion are characterized by high total rare earth elements, enrichment of heavy rare earth elements (HREE), depletion of light rare earth elements (LREE), strong positive Ce anomalies and negative Eu anomalies, which are consistent with the characteristics of magmatic zircons. The Y-U/Yb diagram shows that it was formed in the continental crust zircon area near the oceanic crust. In the zircon trace element tectonic environment discrimination diagram, most rock samples were fall into the volcanic arc environment area, while a small number of samples into the intraplate environment area. Comprehensive analysis shows that Hefeng lamprophyre was formed in the extension environment of the Jinning Period back arc basin, which may be related to the dynamic mechanism of deep mantle upwelling caused by the fracture and delamination of subduction plates during the subduction of the Cathaysian Block to the Yangtze block.
- lamprophyre /
- zircon /
- U-Pb chronology /
- Trace elements /
- Neoproterozoic /
- Yangtze block

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