| 王婷,郭道军,胡阳,龚晓波,王茜.攀枝花市大田地区古元古代康定岩群斜长角闪岩LA-ICP-MS锆石U-Pb年龄及岩石地球化学特征[J].地质找矿论丛,2021,36(1):67-75 |
| 攀枝花市大田地区古元古代康定岩群斜长角闪岩LA-ICP-MS锆石U-Pb年龄及岩石地球化学特征 |
| LA-ICP-MS zircon U-Pb age and petrogeochemical characteristics of plagioclase amphibolite in Palaeoproterozoic Kangding Group-complex in Datian area, Panzhihua city |
| 投稿时间：2020-08-04 |
| DOI：10.6053/j.issn.1001-1412.2021.01.008 |
| 中文关键词: 锆石U-Pb年龄 岩石地球化学 古元古代 康定岩群 斜长角闪岩 大田地区 四川省 |
| 英文关键词:zircon U-Pb age rock geochemistry Paleo-proterozoic Kangding Group-complex plagioclase amphibolite Datian area Sichuan province |
| 基金项目:中国地质调查局“龙门山-滇中成矿带通安和宁蒗地区地质矿产调查”项目（编号：DD20160017）资助。 |
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| 中文摘要: |
| 康定岩群出露在四川康定—西昌—攀枝花—云南元谋一带，前人曾测得过较多的康定岩群太古代-古元古代同位素年龄，随着工作的深入，亦获得大量的青白口纪同位素年龄。本文对出露于攀枝花大田地区的康定岩群咱里岩组斜长角闪岩进行岩石学、岩石地球化学特征研究，同时进行了LA-ICP-MS锆石U-Pb年龄分析。结果表明，康定岩群咱里岩组斜长角闪岩原岩为基性火山岩，野外露头具有喷发韵律旋回特征，其变质作用起于古元古代末期，为多期次热变质作用叠加改造形成，并达到高角闪岩相变质程度；锆石环带获得的807 Ma±4.8 Ma锆石年龄仅代表了一次较强的热变质事件。 |
| 英文摘要: |
| For a long time, many Archean-Paleoproterozoic isotopic ages have been obtained from Kangding Group-complex in Kangding-Xichang-Panzhihua-Yuanmou area, Sichuan province. With deepening of researches a large number of isotopic ages of Qingbaikou Period have been obtained. In this paper are analyzed data of petrology, geochemistry and LA-ICP-MS zircon U-Pb age of the plagioclase amphibolite of Zanli Formation of Kangding Group-complex exposed in Datian area of Panzhihua city. The results show that protolith of the amphibolite is basic volcanic rock with eruption rhythmic cycle at outcrops in the field. It is formed by multi-thermal metamorphic reworks from the Late Paleoproterozoic Era as the amphibolite to the end. The zircon age of 807±4.8 Ma obtained from zircon zonation only represents a strong thermal metamorphism event. |
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