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江南造山带东段新元古代洋内俯冲及构造格局——来自诸暨青顶山基性-超基性岩研究的证据
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  • 英文篇名:Intra-Oceanic Subduction and Tectonic Framework of the Eastern Jiangnan Orogen in Neoproterozoic:Evidence from the Basic and Ultrabasic Rocks in Qingdingshan Area of Zhuji
  • 作者:董学发 ; 周宗尧 ; 余盛强 ; 唐增才 ; 赵旭东 ; 肖庆辉
  • 英文作者:Dong Xuefa;Zhou Zongyao;Yu Shengqiang;Tang Zengcai;Zhao Xudong;Xiao Qinghui;Zhejiang Institute of Geological Survey;Development and Research Center of China Geological Survey;
  • 关键词:江南造山带 ; 洋内弧 ; 多岛弧盆系 ; 新元古代 ; 浙江 ; 构造
  • 英文关键词:Jiangnan orogen;;intra-oceanic arc;;multi-arc-basin system;;Neoproterozoic;;Zhejiang;;tectonics
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:浙江省地质调查院;中国地质调查局发展研究中心;
  • 出版日期:2018-06-15 16:59
  • 出版单位:地球科学
  • 年:2018
  • 期:v.43
  • 基金:中国地质调查局项目(No.12120114068901);; 浙江省国土资源厅项目(Nos.2014004,2010001)
  • 语种:中文;
  • 页:DQKX2018S2002
  • 页数:17
  • CN:S2
  • ISSN:42-1874/P
  • 分类号:20-36
摘要
江南造山带东段浙西北地区广泛发育了新元古代岩浆岩,它们是探讨江南造山带构造格局和演化的关键,但其成因和形成的构造背景却备受争论.选择浙江诸暨青顶山地区出露的一套基性-超基性岩为对象,对其开展了详细的锆石年代学、Hf同位素组成及岩石地球化学研究.LA-ICP-MS锆石U-Pb年龄测定结果表明,青顶山基性-超基性岩形成于~860 Ma.锆石εHf(t)值分别为+9.7和+9.5.根据岩石地球化学特征,将青顶山基性-超基性岩分为"低铝高镁型"和"高铝低镁型"两类.前者岩石以高钛、镁、铁,低铝,富Cr、Ni,低的Sr/Y值为特征,后者则以低钛、镁、铁,高铝,贫Cr、Ni,高的Sr/Y值为特征.地球化学特征及锆石Hf同位素组成均指示青顶山基性-超基性岩形成于洋内弧环境,其成因可能与俯冲大洋板片熔融与不同深度的地幔楔交代有关.结合前人研究成果,初步构建了"龙门山洋内弧(1 172~840 Ma)-皖赣弧间盆地(1 061~827 Ma)-万年陆缘弧(~840 Ma)-赣湘弧后盆地(820~830 Ma)"的江南造山带东段新元古代多岛弧盆系大地构造格架,为江南造山带研究提供了新思路.
        Neoproterozoic magmatic rocks, which extensively developed in the Northwest Zhejiang Province of the eastern Jiangnan orogen, are the key for discussing the pattern and evolution of the Jiangnan orogen. Although they have a great deal of research, their petrogenesis and tectonic setting remain ambiguous. In this paper, a set of basic-ultrabasic rocks from Qingdingshan area, Zhuji, Zhejiang Province are selected as objects, and detailed zircon chronology, Hf isotopic composition and geochemistry of rocks are studied. Zircon LA-ICP-MS U-Pb dating of Qingdingshan basic-ultrabasic rocks shows that these rocks were formed at 860 Ma approximately. The zircon εHf(t) values are 9.7 and 9.5, respectively. According to the geochemical characteristics of rocks, Qingdingshan basic-ultrabasic rocks are divided into two types: "low Al and high Mg" and "high Al and low Mg".The former rocks are characterized by high TiO2, MgO, Fe2O3?, low Al2O3, rich in Cr-Ni and low Sr/Y value, while the latter is characterized by low Ti O2, MgO, Fe2O3?, high Al2O3, poor Cr-Ni and high Sr/Y value. The geochemical characteristics and zircon Hf isotopic composition indicate that the Qingdingshan basic-ultrabasic rocks were formed in the oceanic island arc environment, and their genesis may be related to the subduction of the oceanic plate and the mantle wedge metasomatism at different depths. Based on the previous research results, the tectonic framework of the Neoproterozoic multi-arc-basin system in the eastern Jiangnan orogen has been preliminarily constructed for the "Longmenshan intraoceanic arc(1 172–840 Ma)-Anhui-Jiangxi inter-arc basin(1 061–827 Ma)-Wannian continental margin arc(~840 Ma)-Jiangxi-Hunan back-arc basin(820–830 Ma)". It provides a new perspective for the study of Jiangnan orogen.
引文
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