Open AccessStudy on the Genesis and Tectonic Significance of the Volcanic Rocks of the Sanwan Formation in the Hannan Area
Author(s) -
Dequan Wang,
Jianguo Wang,
Shengbo Deng,
Yizhong Wang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/300/2/022054
Subject(s) - lithophile , geology , geochemistry , andesite , volcanic rock , basalt , trace element , island arc , basaltic andesite , magma , partial melting , tectonics , volcano , metamorphic rock , petrology , subduction , paleontology
The Sanwan Formation is distributed in Baimianxia, Bailongtang, Xixiang County, north margin of Yangtze Platform. It is mainly composed of a set of metamorphic volcanic sedimentary rocks.The Sanwan Formation experienced multi-phase tectonic activities and produced long strips of faults. Four representative volcanic rocks of the Sanwan Formation were collected. According to the analysis results of major elements, they are andesite-basalt andesite.According to trace element analysis, large ion lithophile elements (Sr, Ba, Rb, Th) are enriched, while high field strength elements (Ta, Nb, Zr, Hf, Ti) are relatively deficient. They have the characteristics of island arc volcanic rocks.According to trace element geochemical diagrams, we believe that fluid is involved in the formation of primitive magma, and magma shows strong partial melting trend and weak crystallization differentiation trend.