Zircon U−Pb dating and geochemistry of basalt in Guaizhangshan Group from the Southern Danghe Mountain in South Qilian and its tectonic setting

JI Bo; LI Xiangmin; HUANG Botao; WANG Lei; WANG Guoqiang

doi:10.12029/gc20200619003

2024 Vol. 51, No. 3

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JI Bo, LI Xiangmin, HUANG Botao, WANG Lei, WANG Guoqiang. 2024. Zircon U−Pb dating and geochemistry of basalt in Guaizhangshan Group from the Southern Danghe Mountain in South Qilian and its tectonic setting[J]. Geology in China, 51(3): 965-977. doi: 10.12029/gc20200619003

Citation:

JI Bo, LI Xiangmin, HUANG Botao, WANG Lei, WANG Guoqiang. 2024. Zircon U−Pb dating and geochemistry of basalt in Guaizhangshan Group from the Southern Danghe Mountain in South Qilian and its tectonic setting[J]. Geology in China, 51(3): 965-977. doi: 10.12029/gc20200619003

Zircon U−Pb dating and geochemistry of basalt in Guaizhangshan Group from the Southern Danghe Mountain in South Qilian and its tectonic setting

1.
MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi’an Center of Geological Survey, China Geological Survey, Xi’an 710054, Shaanxi, China
2.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China

Fund Project: Supported by National Natural Science Foundation of China (No.41802133) and the project of China Geological Survey (No. DD20200208).

More Information

Author Bio: JI Bo, male, born in 1986, master, engineer, engaged in regional geological survey, sedimentology, petrogeochemistry research; E-mail: jiboxa@126.com

Received Date: 19 June 2020

Revised Date: 27 August 2020

Publish Date: 25 May 2024

Abstract

Abstract

This paper is the result of geological survey engineering.
Objective
The Neoproterozoic Guaizhangshan Group was disintegrated from the Silurian Balonggonggaer Formation. The study of the petrogenesis and tectonic setting of the basalt in Guaizhangshan Group is crucial to clarify the tectonic evolution of South Qilian.
Methods
Based on LA−ICP−MS zircon U−Pb datingand whole−rock geochemistry analysis, the formation age, geochemical characteristics and geological significance of the basalt in Guaizhangshan Group are constrained.
Results
The dating results indicate the eruption age of the basalt is (786.6±5.8) Ma, suggesting that the Guaizhangshan Group formed during Early Neoproterozoic. Geochemical analyses of the basalt show that: SiO₂=48.09%–50.97%, TiO₂=1.34%–2.55%, MgO=5.78%–7.11%, displaying characteristics of subalkaline tholeiite; Significant differentiation between light rare earth element (LREE)and heavy rare earth elements (HREE) ((La/Yb)_N=3.76–4.51), and inconspicuous Eu anomalies (δEu=0.80–1.05); Enrichment of Ba, Th, U, Pb, and depletionin Nb, Ta, Ti.
Conclusions
These geochemical characteristics indicate that the basalts were derived from mantle and contaminated by crustal materials. The basalt was formed in continental rift setting, which may be relevant to the break−up of the Rodinia supercontinent.
- zircon U−Pb dating /
- basalt /
- Guaizhangshan Group /
- tectonic setting /
- geological survey engineering /
- southern Qilian

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