Petrogenesis and tectonics of late Early Cretaceous Shoshon-itic volcanic rocks in Xilin Hot, Inner Mongolia

WANG Liangyu; LIAO Qun'an; JIANG Yunchuan; LUO Ting; HU Chaobin; XIAO Dian; TANG Shuai; LIU Yang

2016 Vol. 35, No. 6

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WANG Liangyu, LIAO Qun'an, JIANG Yunchuan, LUO Ting, HU Chaobin, XIAO Dian, TANG Shuai, LIU Yang. Petrogenesis and tectonics of late Early Cretaceous Shoshon-itic volcanic rocks in Xilin Hot, Inner Mongolia[J]. Geological Bulletin of China, 2016, 35(6): 919-931.

Citation:

WANG Liangyu, LIAO Qun'an, JIANG Yunchuan, LUO Ting, HU Chaobin, XIAO Dian, TANG Shuai, LIU Yang. Petrogenesis and tectonics of late Early Cretaceous Shoshon-itic volcanic rocks in Xilin Hot, Inner Mongolia[J]. Geological Bulletin of China, 2016, 35(6): 919-931.

Petrogenesis and tectonics of late Early Cretaceous Shoshon-itic volcanic rocks in Xilin Hot, Inner Mongolia

1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China;
2. No. 243 Geological Party of Nuclear Industry, CNNC, Chifeng 024006, Inner Mongolia, China

Received Date: 16 November 2015

Revised Date: 20 April 2016

Publish Date: 15 June 2016

Abstract

Abstract

According to the research on zircon dating and cross section, the authors redefined Late Jurassic Manketou Formation as Early Cretaceous Meletu Formation in the southwestern segment of the Da Xinggan Mountains. Volcanic rocks are divided into two kinds of lithology, the lower segment is mainly trachy-andesite with minor trachyte, whereas the upper is trachyte and rhyolite. The zircon U-Pb age of trachyte is 118.1±1.3Ma, suggesting that its formation age is Early Cretaceous. Rocks have rich alkali, rich po-tassium, and high aluminum whose value varies in a wide range, high Fe₂O₃/FeO ratios (>0.5), and relatively rich light rare earth ele-ments and LILE (such as Rb, Ba, Th and Pb) but poor high field strength elements (such as Nb, Ta, and P). Rocks have obvious iron-depletion evolution trend in the AFM diagram and "Barbed" evolution trend in the SiO₂-K₂O diagram, with conspicuous char-acteristics of shoshonites. Studies show that the intermediate acidic volcanic rocks of the Meletu Formation in the study area have magmatic evolution characteristics of the same source region. Magma originated from enrichment of mantle metasomatism and was formed in a stretching tectonic background and related to the retreat of subduction of the Pacific Plate.
- southwestern segment of the Da Hinggan Mountains /
- late Early Cretaceous /
- Meletu Formation /
- extensional environ-ment /
- metasomatic enriched mantle

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References

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