Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 712-723.doi: 10.13278/j.cnki.jjuese.201503106

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Mineral and Elemental Geochemistry Records of the Paleoclimate and the Tectonic Background in Late Triassic Xiaoshui Formation-Early Jurassic Jinji Formation in East Guangdong

Xu Zhongjie1, Cheng Rihui1, Wang Liaoliang2, Zhang Li2   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Guangzhou Bureau of Marine Geology Survey, Guangzhou 510075, China
  • Received:2014-09-23 Published:2015-05-26

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Abstract:

The whole rock analysis, the ICP-MS trace,the rare earth elements test, and the mineral composition analysis were made to the mudstone and sandstone samples collected from Jiexi Huizhai Upper Triassic Xiaoshui Formation and Huizhou Huangdong Lower Jurassic Jinji Formation. Based on the changes of the element content and the ratios, the water was in a reductive and anaerobic environment as a whole; and it was mainly in a dry and hot climate during the Late Triassic Xiaoshui Formation in Jiexi area and the Early Jurassic Jinji Formation in Huizhou area in east Guangdong. The ∑REE is high, the LREE is rich (LREE/HREE are 10.86 and 15.63), and the HREE is more stable (∑HREE are 6.09×10-6 and 7.99×10-6) with a negative Eu anomaly (δEu are 0.67 and 0.87) in Xiaoshui Formation. The LREE is rich (LREE/HREE=7.29-10.03), the HREE is more stable (∑HREE=(15.39-19.72)×10-6) with a negative Eu anomaly (δEu=0.59-0.65) in Jinji Formation. The mudstone REE distribution diagram and the source rock discrimination diagram show that the Xiaoshui Formation and Jinji Formation source rocks were from the sedimentary rocks, granite, and basalt of the upper-crust. The sediment source rocks of Xiaoshui Formation in the lower part were deeper than the ones in the upper part. The sediment source rocks of Jinji Formation in the upper part were deeper than the ones in the middle-lower part. Based on the Dickinson diagram, the discrimination diagrams of K2O/Na2O-SiO2, Zr-Th, La-Th-Sc, Th-Co-Zr/10,and the REE characteristics values, the tectonic background of Late Triassic Jiexi area was the back-arc extensional basin. It presents the feature of a passive continental margin and also the continental island arc (transformed by the Andean continental margin arc). The provenance was from the volcanic arc orogenic belt. Huangdong area was the back-arc extrusion basin in Early Jurassic with the passive continental margin characteristics. The sediment provenance is from the cut magmatic arc.

Key words: east Guangdong, Upper Triassic, Lower Jurassic, Xiaoshui Formation, Jinji Formation, element geochemistry, paleoclimate, tectonic background

CLC Number: 

  • P597.2

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