科研之友
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摘要
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.
- 出版日期2002-7
