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利用阴极发光、LA-ICPMS和SHRIMP定年技术, 对南天山北缘缝合带东段的榆树沟蛇绿岩地体中两个麻粒岩相变质基性火山岩样品中锆石进行了内部结构、微量元素组成分析和原位定年. 所获得的变质锆石年龄分别为 392?和390?1 Ma, 代表了该蛇绿岩块体经历麻粒岩相变质改造的年龄, 揭示南天山洋在泥盆纪早期即开始向北俯冲.
The internal structure of zircons in two granulite-facies metamorphosed metamorphic volcanic rocks in the Yushugou ophiolite terrane in the eastern section of the southern margin of the southern Tianshan Mountains was studied by using cathodoluminescence, LA-ICPMS and SHRIMP dating techniques. Trace elements Composition analysis and in-situ dating.The metamorphic zircon ages are 392 Å and 390 Å, respectively, representing the age of the ophiolite block underwent metamorphism alteration, revealing that the southern Tianshan Ocean in Devonian Early that began to dive north.