U–Pb isotopic age of Longwangdong ophiolitic mélange in the Tianshui Area, West Qinling Orogenic Belt and its time limit of subduction–collision

SHI Chao; GU Pingyang; PENG Xuan; PAN Xiaoping; TIAN Rong

doi:10.12029/gc20201203002

2024 Vol. 51, No. 6

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SHI Chao, GU Pingyang, PENG Xuan, PAN Xiaoping, TIAN Rong. 2024. U–Pb isotopic age of Longwangdong ophiolitic mélange in the Tianshui Area, West Qinling Orogenic Belt and its time limit of subduction–collision[J]. Geology in China, 51(6): 1960-1971. doi: 10.12029/gc20201203002

Citation:

SHI Chao, GU Pingyang, PENG Xuan, PAN Xiaoping, TIAN Rong. 2024. U–Pb isotopic age of Longwangdong ophiolitic mélange in the Tianshui Area, West Qinling Orogenic Belt and its time limit of subduction–collision[J]. Geology in China, 51(6): 1960-1971. doi: 10.12029/gc20201203002

U–Pb isotopic age of Longwangdong ophiolitic mélange in the Tianshui Area, West Qinling Orogenic Belt and its time limit of subduction–collision

1.
Xi’an Center of China Geological Survey, Geosciences Innovation Center of Northwest China, Xi’an 710119, Shaanxi, China
2.
Centre for Orogenic Belt Geology, China Geological Survey, Xi’an 710119, Shaanxi, China
3.
Chinese Academy of Geological Sciences, Beijing 100083, China

Fund Project: Supported by the Natural Basic Research Project of Shaanxi Province (No.2023–JC–ZD–14, No.2022JQ–286) and the projects of China Geological Survey (No.DD20190069, No.DD20221636, No.DD20243411, No.DD20240029).

More Information

Author Bio: SHI Chao, male, born in 1986, senior engineer, mainly engaged in petrology; E-mail: fancyboy88@163.com
Corresponding author: GU Pingyang, male, born in 1982, professor level senior engineer, mainly engaged in tectonic geology and geochemistry; E-mail: pingyang-322@163.com.

Received Date: 03 December 2020

Revised Date: 19 April 2021

Publish Date: 25 November 2024

Abstract

Abstract

This paper is the result of geological survey engineering.
Objective
The newly discovered Longwangdong ophiolitic mélange as a typical ophiolite suit in the Tianshui area of West Qinling Orogenic Belt witnessed the westward extension of Shangdan suture zone in Qinling Orogenic Belt. Studying its petrology, geochronology, and geochemistry will help improve our understanding of the tectonic evolution of this region.
Methods
This study demonstrates through petrological and whole−rock geochemical analyses that this ophiolite suite is mainly composed of amphibolite, metamorphosed basalt, and pyroxenite.
Results
LA–ICP–MS zircon U–Pb dating shows the meta−gabbro was formed at (474.6±6.7) Ma, constraining the formation time of the mélange. The whole−rock geochemical analysis reveals that the meta−basalts are subalkalic tholeiite in composition and rich in Ti, Mg and Fe. The total REE of the meta−basalts are low and characterized by flat type distribution pattern without obvious Eu anomalies. Their trace element distribution yields flat patterns with negative anomalies of Cs, Th, Nb, and lowed Zr/Nb ratios, consistent with that of the E−MORB.
Conclusions
The geochemical features of the meta−basalts suggest the Longwangdong ophiolitic mélange was potentially generated in the extended volcanic arc environment, which was considered to be the back−arc basin based on the regional geological data. It further implies that Shangdan Ocean experienced a period of subduction process in the Early Ordovician in the West Qinling region.
- ophiolitic mélange /
- LA–ICP–MS zircon U–Pb dating /
- Early Ordovician /
- tectonic setting /
- West Qinling Orogenic Belt /
- geological survey engineering /
- Shangdan suture zone

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References

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