山东铁铜沟橄榄岩的水含量:华北克拉通早白垩世富水岩石圈的分布

被引：11

作者：

夏群科 ^{[1
,2
]}

程徽 ^{[1
]}

刘佳 ^{[1
,2
]}

机构：

[1] 中国科学技术大学地球和空间科学学院

[2] 浙江大学地球科学学院

来源：

地球科学 | 2017年 / 42卷 / 06期

关键词：

水含量; 橄榄岩; 早白垩世; 铁铜沟; 克拉通破坏; 岩石学; 地球化学;

D O I：

暂无

中图分类号：

P534.53 [白垩纪（系）]; P588.125 [];

学科分类号：

070903 ; 070901 ;

摘要：

已有研究表明,华北克拉通东部的山东费县岩石圈地幔在克拉通破坏峰期（早白垩世）时是高度富水的,其中橄榄石的H2O含量>180×10-6;而同期克拉通西部的太行山符山地区岩石圈地幔具有贫水特征,其中橄榄石的H2O含量为10×10-6.这表明西向俯冲的古太平洋板块造成了华北东部早白垩世岩石圈地幔的富水特征,为克拉通破坏提供了力学前提.为了解古太平洋板块俯冲的影响范围,对介于费县和符山之间的山东铁铜沟地区早白垩世高镁闪长岩中的橄榄岩捕掳体进行了含水性分析,橄榄石的原始H2O含量(6×10-624×10-6,平均值为（15±7）×10-6)与符山地区相当,暗示太平洋板块俯冲造成的岩石圈富水效应可能仅局限在华北最东部,这和最东部地区克拉通破坏程度最高是一致的.

引用

页码：853 / 861

页数：9

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