安第斯埃达克岩 :三种成因模式(英文)
Andean adakites: three ways to make them
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摘要: 在安第斯埃达克岩是常见的。由这种岩石的痕量元素特征揭示的高压组成矿物 ,表明其有三种可能的成因。这三种成因按相对重要性依次为 :安第斯地壳的构造加厚 ;弧前壳的俯冲 -侵蚀 ;年轻洋壳的俯冲。在过去 30 Ma,每种成因模式的埃达克岩在智利 -阿根廷安第斯地区均有喷发。它们的产状与智利 -阿根廷边缘快速变化的构造背景中特定构造条件和事件相吻合。埃达克岩在过去安第斯边缘的产状可望成为矿化的优异构造标志 ,也可用于指导找矿Abstract: Andean adakites are common. The high pressure source mineralogy signaled by Andean adakite trace element characteristics originates in three ways. Listed in order of relative importance, the ways are tectonic thickening of Andean crust, subduction erosion of forearc crust, and subduction of young oceanic crust. Over the past 30 Ma adakites representing each mode of origin have erupted in the Chilean Argentine Andes. Occurrence is matched with specific tectonic conditions and events in the rapidly changing tectonics of the Chilean Argentine Andean margin. Adakite occurrences in Andean margins of the past promise to be excellent tectonic indicators, as well as guides to mineralization.
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Key words:
- Adakite /
- Origination /
- Andean
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