| 康定变质侵入岩的年代学及岩石地球化学特征 |
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| 引用本文：李志红,罗照华,陈岳龙,赵俊香.2005.康定变质侵入岩的年代学及岩石地球化学特征[J].地球学报,26(z1):87-89. |
| DOI：10.3975/cagsb.2005.s1.28 |
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| 基金项目:本文为国家白然科学基金项目（批准号:40173007,40234052 )资助。 |
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| 中文摘要:川西康定地区出露的变质侵入岩是以石英闪长岩、英云闪长岩和花岗闪长岩为主的中酸性岩浆岩。岩石中锆石主要结晶于721~773 Ma，表明其形成于新元古代；岩体中所测最老年龄为2 468 Ma，可能代表扬子陆块的基底；在锆石的增生边及新生错石颗粒获得的99~531 Ma年龄反映了后期变质事件的改造。该岩体的主量元素显示钙碱性分异趋势，微量元素呈现典型的岛弧环境地球化学特征，即相对富集大离子亲石元素、轻稀土元素，亏损高场强元素和的富集。以上的特征表明，康定地区变质侵入岩在新元古代可能处于与俯冲有关的岩浆弧环境。 |
| 中文关键词:康定杂岩 变质侵入岩 新元古代 岩浆弧 |
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| Geochronological and Geochemical Characteristics of Kangding Metamorphosed Intrusions |
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| Abstract:The Kangding metamorphosed intrusions are mainly composed of quartz diorite-tonalite -granodiorite. The ages of igneous zircons from the complex range from 721 to 773 Ma, which shows the intrusive activity during Neoproteronoic. The oldest age obtained from the intrusions is 2468 Ma, implying the involvement of materials from Yangtze craton basement. The ages of 99~531 Ma produced from zircon rims may reflect later metamorphic events. The complex shows a calc-alkaline differential trend in major elements, and the trace elements exhibit typical geochernical features of the island arc setting. |
| keywords:Kangding complex trace elements SHRIMP dating magmatic arc |
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