中天山早泥盆世陆弧：来自花岗质糜棱岩地球化学及SHRIMP-U／Pb定年的证据
Earlier Devonian active continental arc in Central Tianshan:evidence of geochemical analyses and Zircon SHRIMP dating on mylonitized granitic rock.
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摘要: 中天山巴伦台以北地区出露一套糜棱岩化的中-酸性侵入岩，元素地球化学特点表明其属于火山弧环境；锆石SHRIMP U／Pb法测试结果揭示其侵位年龄在405—416Ma间，属早泥盆世。这一研究结果显示，早在晚志留世晚期，南天山洋已开始向北俯冲，并在中天山地块南缘形成火山弧环境。至早泥盆世晚期，塔里木陆块与中天山火山弧发生碰撞。
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关键词:
- 糜棱岩化花岗岩 /
- 地球化学 /
- SHRIMP锆石U-Pb年龄 /
- 中天山
Abstract: Mylonitized dioritic-granitic plutons occurred in north of Baluntai area,central Tianshan,Northwest China.Element geochemical data reveal that the dioritic-granitic plutons were generated at active continental arc environment like today's Chile;zircon U/Pb SHRIMP dating and CL imaging indicat that the active continental volcano arc developed at 405 -416 Ma.These data demonstrat that the paleo-south Tianshan ocean crust started northward subducting under the central Tianshan block at earlier Devonian,resulting in a continental arc upon the overriding plate.The following collision between the central Tianshan block and the Tarim block might begin at later of Earlier Devonian. -
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