Geochemical Characteristics and Tectonic Significance of the Volcanic Rocks from Lower Triassic Huari Formation in West Qinling

LI Zhucang; LI Yongjun; QI Jianhong; ZHANG Haifeng; YANG Zhiyong; LIU Zhibing; ZHOU Ye

Northwestern Geology > 2016 > 49(1): 26-33.

LI Zhucang, LI Yongjun, QI Jianhong, et al. Geochemical Characteristics and Tectonic Significance of the Volcanic Rocks from Lower Triassic Huari Formation in West Qinling[J]. Northwestern Geology, 2016, 49(1): 26-33.

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Geochemical Characteristics and Tectonic Significance of the Volcanic Rocks from Lower Triassic Huari Formation in West Qinling

1.
School of Earth Science and Resources Management, Chang'an University, Xi'an 710054, Shaanxi, China;Third Institute Geological and Mineral Exploration of Gansu provincial Bureau of Geology and Mineral Resources, Lanzhou 730000, Gansu, China
2.
School of Earth Science and Resources Management, Chang'an University, Xi'an 710054, Shaanxi, China
3.
Third Institute Geological and Mineral Exploration of Gansu provincial Bureau of Geology and Mineral Resources, Lanzhou 730000, Gansu, China

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Received Date: May 04, 2015
Revised Date: July 09, 2015
Published Date: March 04, 2016

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Abstract

Abstract

The Huari Formation, located in Hezuo region of West Qinling, are mainly consist of neutral to acidic volcanic rocks, including dacite, andesite, volcanic breccia and tuff. The rock geochemical results show that, these rocks belong to calc-alkaline series, with the characteristics of high potassium and alumina, low alkali and titanium. Moreover, the geochemical features of these rocks on trace elements are similar with the ones of typical volcanic island arc. The total rare earth elements are 61.91×10^-6~185.58×10^-6, with an average of 128.04×10^-6, showing LREE enrichment, HREE depletion with weak negative Eu anomalies (average is 0.98). Combined with the tectonic evolution of western Qinling orogenic belt, it's suggested that lower Triassic Huari Formation was formed in island arc setting.
- geochemistry,
- volcanic rock,
- tectonic environment,
- Huari Formation,
- West Qinling

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Geochemical Characteristics and Tectonic Significance of the Volcanic Rocks from Lower Triassic Huari Formation in West Qinling

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