Delineation of Hongshan-Shudu Ophiolite Mélange in Geza Volcanic-Magmatic Arc and Its Significance, Southwest
详细信息
- 责任者：Li Wenchang (Yunnan Geological Survey ; Kunming 650051 ; China) ; Yin Guanghou
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(6)
- 关键词：蛇绿混杂堆积 ; ophiolite complexes ; 西南地区 ; Southwest China
- 页码：p.1661-1671
- 图表：5 illus., 4 tables, 25 refs.
- 分类号：0300
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Geza volcanic-magmatic arc is divided into two porphyry metallogenic belts, east belt and west belt, in the southern part of Yidun island arc. The two belts differ greatly in metallogenic epoch and metallogeny, issues about whether a large structural unit exists between them and how they relate Ganzi-Litang ophiolite mélange were remain undecided. It was found that mafic-ultramafic cumulates discontinuously exposed, together with basalt, siliceous slate, flysch and limestone of Niru Formation. They form Hongshan-Shudu ophiolite mélange which formed in early subduction of Ganzi-Litang oceanic crust and subordinated to Ganzi-Litang mélange belt. The two ophiolite mélange belts and Geza volcanic-magmatic arc have delineated the tectonic sketch of southern Yidun arc. Hongshan-Shudu ophiolite mélange belt is a boundary of the two metallogenic belts above-mentioned. The recognition of Hongshan-Shudu ophiolite mélange has great significance in further approaching the range and tectonic evolution of Ganzi-Litang Ocean, metallogenic regularity of porphyry belts of Geza volcanic-magmatic arc and regional prospecting.