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近年来,越来越多的地质资料表明中国东部岩石圈之下确实存在古太平洋板块的残片,并到达重力梯度带附近(如,Huang and Zhao,2006),那么古太平洋板块的俯冲事件对中国东部岩石圈的影响程度和方式是什么。据原始定义,埃达克岩是来自于洋壳的部分熔融作用的产物,其岩石类型为中酸性岩石,缺失基性端元,矿物组合以斜长石和角闪石为主;主量元素Si O2≥56%,富Na2O,Mg O<3%(很少>6%),与正
In recent years, more and more geological data show that there are indeed fragments of the Paleo-Pacific plate beneath the lithosphere in eastern China and reach the vicinity of the gravity gradient zone (Huang and Zhao, 2006). Therefore, the subduction events of the Paleo-Pacific Plate What is the extent and manner of influence of the eastern lithosphere? According to the original definition, the adakite is a product of partial melting from the oceanic crust. Its rock type is medium-acidic rocks with the absence of the basic end-units. The mineral assemblage is dominated by plagioclase and amphibole. The major element Si O2 ≥56%, Na2O rich, MgO <3% (rarely> 6%), and positive