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青藏高原安多地块中生代高压变质作用的年代学研究 被引量:1

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摘要 安多微陆块位于青藏高原班公湖-怒江缝合带中段,具有不同于其北部的羌塘地体和南部的拉萨的地体的基底锆石年龄。文章对安多微陆块的基性高压麻粒岩和片麻岩进行了研究,发现其中生代的年龄信息分为:麻粒岩变质年龄为185 Ma,片麻岩变质年龄为175 Ma,分别代表麻粒岩相峰期变质作用时间和角闪岩相退变质期时间。P-T-t轨迹显示顺时针的变质过程(ITD)。这些结果说明,安多微陆块在中生代时期向北俯冲到羌塘地体之下50 km处,并随后折返至中地壳(20 km),抬升速率为3 mm/a。
作者 陆晓 林彦蒿
出处 《企业技术开发(中旬刊)》 2014年第4期143-152,共10页
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