The Define and Geological Significance of Permian-Triassic Magmatic Arc at Dangjiangrong, South of Duocai Ophiolite MÉLange Zone in the Zhiduo Area, Qinghai Province, China
详细信息
- 责任者：Liu Yin (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Li Rongshe
- 刊名：Geological Bulletin of China
- 出版年：2010
- 卷期：29(12)
- 关键词：蛇绿混杂堆积 ; ophiolite complexes ; 岛弧 ; island arc ; 蛇绿岩 ; ophiolite ; 青海 ; Qinghai Province
- 页码：p.1840-1850
- 图表：9 illus., 1 table, 53 refs.
- 分类号：0300
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
Through the detailed field investigation of the S-N directional cross section of Dangjiangrong volcanic rocks zone, located in the south of the Duocai ophiolite meglange zone, the authors found that the pre-existed main rock assemblage was andesite,rhyolite porphyry, rhyolitic tuff and andesitic tuffaceous lava. The results from XRF analysis and ICP-MS analysis on systemic sampling show that the Dangjiangrong volcanic rocks are rich in SiO2（56.92%~75.71%） and Na2O（Na2O>K2O）, poor in TiO2（0.15%~0.77%）, belonging to calc-alkaline type rocks. It is proved that the volcanic rocks were formed in an island-arc environment by the evidence of petrochemistry and geochemistry of trace and rare element, which provides the corroborating evidences to the further define of subduction polarity and tectonic setting of Duocai ophiolite mélange zone.
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