Geological characteristics and tectonic environment of Middle Permian volcanic rocks in eastern Pingle depression, Jiangxi Province

HUANG Chuanguan; LÜ Shaojun; HE Bin; ZHOU Zhiqiang; XIONG Qiaoling

2017 Vol. 36, No. 2-3

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HUANG Chuanguan, LÜ Shaojun, HE Bin, ZHOU Zhiqiang, XIONG Qiaoling. Geological characteristics and tectonic environment of Middle Permian volcanic rocks in eastern Pingle depression, Jiangxi Province[J]. Geological Bulletin of China, 2017, 36(2-3): 477-484.

Citation:

HUANG Chuanguan, LÜ Shaojun, HE Bin, ZHOU Zhiqiang, XIONG Qiaoling. Geological characteristics and tectonic environment of Middle Permian volcanic rocks in eastern Pingle depression, Jiangxi Province[J]. Geological Bulletin of China, 2017, 36(2-3): 477-484.

Geological characteristics and tectonic environment of Middle Permian volcanic rocks in eastern Pingle depression, Jiangxi Province

Geological Survey of Jiangxi Province, Nanchang 330030, Jiangxi, China

Received Date: 09 July 2015

Revised Date: 25 February 2016

Publish Date: 25 March 2017

Abstract

Abstract

Middle Permian volcanic rocks were discovered in the Mingshan area of eastern Pingle depression, and the rock type is mainly composed of alkali basalt, sub-alkaline basalts and andesitic basalt, called Mingshan basalt. The volcanic rocks are sandwiched between Mingshan Formation thin siliceous rocks and siliceous shale, with vesicular structure and a large number of amygdales, about 15m in thickness. The volcanic rocks are characterized by poor silicon, rich iron, high aluminum, low magnesium, Mg^# content ranging from 4.08 to 19.48, relative enrichment of high field strength elements Nb, Ta, Zr, Hf, significant enrichment of U, Th and light rare earth elements (LREE), and (La/Yb)_N content ranging from 3.58 to 72.53, with insignificant Eu depletion (δEu=0.42~0.85) and slightly rightly-oblique REE distribution patterns. Researches show that Mingshan basalt was probably formed in an active continental margin rift basin environment with light rare earth ore source bed; nevertheless, there also exists the evidence arguing that the Dongwu Movement caused the submarine volcanic eruption in South China.
- Middle Permian /
- volcanic rocks /
- eastern Pingle depression /
- Dongwu Movement /
- Jiangxi

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References

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