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Occurrence of Neoproterozoic low-grade metagranite in the western Beihuaiyang zone, the Dabie orogen
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  • 分类:P534[天文地球—古生物学与地层学;天文地球—地质学]
  • 作者机构:[1]东华理工大学核资源与环境省部共建国家重点实验室培育基地,江西南昌330013, [2]东华理工大学地球科学学院,江西南昌330013, [3]江西省地质调查研究院,江西南昌330030
  • 相关基金:国家自然科学基金项目(40634023,90814008);江西省教育厅科研项目(GJJ14476);东华理工大学核资源与环境实验室自主基金项目(Z201403)
  • 相关项目:华北陆块南缘中生代岩石圈增厚机制的地球化学研究
中文摘要:

赣中周潭群位于扬子陆块、华夏陆块与华南加里东期褶皱带的交汇部位,由于经历了多期构造地质作用,对其成因认识一直存在争议。从构造地质学、同位素年代学和地球化学角度出发,对其形成与演化提出新的认识。结果显示周潭群中的变基性岩形成于中元古代,而变沉积岩形成于830~820Ma,并共同经历了加里东期变质作用,宜将周潭群重新命名为周潭杂岩。新元古代的大洋俯冲作用及古生代陆内造山作用是解释周潭群形成与演化的理想模型。

英文摘要:

Zhoutan group of central Jiangxi province is located in the conjuncture area of Yangtze and Cathaysia blocks and Jiangnan orogen. It has been previously considered to be Preeambrian metamorphic basement of Cathaysia block or to be a component part of Caledonian fold zone. On basis of integrated petrological, geochronological and geochemical data, a new modal of formation and evolution has been proposed. The results suggest that meta-basahs and meta-sedimentary rocks of respectively, and they together experienced Zhoutan group were formed in the Mesoproterozoic and 830-820 Ma, Paleozoic metamorphism. In this regard, the Zhoutan group should be redefined as Zhoutan Complex. The modal of oceanic subduetion in the Neoproterozoic and intraeontinental orogen in the Paleozoic in the best one to interpret the formation and evolution of the Zhoutan Group.

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