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曾文涛,刘桂春,冯庆来,赵天宇,俞赛赢,邓仁宏,莫熊.临沧地体亲缘性及南段组物源——来自泥盆纪-石炭纪南段组碎屑锆石U-Pb年龄的证据[J].地质通报,2017,(7):1175-1187.
临沧地体亲缘性及南段组物源——来自泥盆纪-石炭纪南段组碎屑锆石U-Pb年龄的证据    点此下载全文
曾文涛1  刘桂春1  2  冯庆来2  赵天宇2  俞赛赢1  邓仁宏1  莫熊1
1. 云南省地质调查院, 云南 昆明 650216;
2. 中国地质大学地质过程与矿产资源国家重点实验室, 湖北 武汉 430074
基金项目:中国地质调查局项目《云南区域地质调查片区总结与服务产品开发》(编号:DD20160345-02)、国家自然科学基金项目《滇西南原题特斯及其与古特提斯演化关系研究》(批准号:41672222)和云南省科技基金项目《西南"三江"叠合成矿作用与成矿预测》(编号:2013HA001)
DOI:
摘要:
      对临沧地体泥盆纪-石炭纪南段组的沉积岩开展碎屑锆石LA-ICP-MS U-Pb定年研究结果表明,所有样品的U-Pb年龄谱存在3个主要峰值:泛非期(530~680Ma)、晚格林威尔期(900~980Ma)和早格林威尔期(1100~1300Ma)。次要峰值年龄为1550~1730Ma和2350~2630Ma,反映了物源区构造-岩浆事件的复杂性。南段组碎屑岩锆石年龄图谱明显区别于思茅地块泥盆纪-石炭纪碎屑锆石年龄图谱,临沧地块南段组碎屑锆石的年龄表明其物源来自东冈瓦纳超大陆,临沧地体应该是来自东冈瓦纳北缘的微地块,这也与其生物特征相吻合。
关键词:碎屑锆石  LA-ICP-MS U-Pb年龄  物源分析  碎屑岩  南段组  临沧地体  滇西南
The relationship between Lincang block and prove-nance of Nanduan Formation:Evidence of detrital zircon U-Pb dating from metasandstone of Devonian-Carboniferous Nanduan Formation    Download Fulltext
ZENG Wentao1  LIU Guichun1  2  FENG Qinglai2  ZHAO Tianyu2  YU Saiying1  DENG Renhong1  MO Xiong1
1. Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China;
2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, Hubei, China
Fund Project:
Abstract:
      U-Pb ages of detrital zircons of Devonian-Carboniferous Nanduan Formation from Lincang block define three distinctive age peaks in older Grenvillian (1100~1300Ma), younger Grenvillian (900~980Ma) and Pan-African (530~680Ma), and two subordi-nate group in 1550~1730Ma and 2350~2630Ma, suggesting that the provenance of sediments had multi-source and complex charac-teristics. The age spectrum is obviously different from detrital zircon age spectrum of the Devonian-Carboniferous sediments of Si-mao block, which indicates that the sediments of Nanduan Formation came from East Ganwana supercontinent, and the result is indi-cated by paleobiology which shows a genetic relationship between East Ganwana and paleo-Tethys in southwest Yunnan.
Keywords:detrital zircon  LA-ICP-MS U-Pb age  provenance analysis  metasandstone  Nanduan Formation  Lincang block  southwest Yunnan
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