辽西中生代陆内底侵作用背景下形成的安山岩
Mesozoic intracontinental andesites formed by underplating in west Liaoning province
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摘要: 本文选择了辽西地区中生代230Ma、190Ma、159Ma、123Ma、116Ma等不同时期的安山岩及其所含的辉石,通过岩石学、岩相学、地球化学和同位素的研究,发现它们同时具有壳源和幔源的特征,而且大多数单斜辉石记录了两种或多种熔体的相互作用.据此作者认为安山岩是壳幔岩浆混熔成因的,而如此长期的热演化与大陆内部伸展背景下的底侵作用有关.
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Key words:
- West Liaoning province /
- Mesozoic /
- Andesite /
- Underplating
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