东北牡丹江地区"黑龙江群"中斜长角闪岩与花岗岩的锆石SHRIMP U-Pb定年及其地质学意义
Zircon SHRIMP U-Pb dating of the amphibolite from "Heilongjiang Group" and the granite in Mudanjiang area, NE China, and its geological significance
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摘要: 佳木斯地块南缘牡丹江地区的岩石学和地球化学研究表明,"黑龙江群"中存在洋壳残片,为形成于古大陆边缘环境的一套造山建造.牡丹江地区东北部的"麻山群"为佳木斯地块南缘的陆壳基底;其南侧的"黑龙江群"属造山建造,包括阿尔卑斯型超基性岩和具有MORB特征的斜长角闪片岩等.对"黑龙江群"中的斜长角闪片岩以及其南边具有同碰撞特征的钾长花岗岩进行了锆石SHRIMP U-Pb定年.结果表明:斜长角闪片岩具有777±18Ma的结晶年龄,并受到437±7Ma的变质作用的影响;同碰撞的钾长花岗岩形成年龄为461±6Ma.据此指出佳木斯地块南缘的黑龙江群中存在新元古代的洋壳残片并推断牡丹江地区存在早古生代的碰撞事件.
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