| 准噶尔板块东北缘富铌玄武岩的发现及其地质意义 |
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| 引用本文： | 张海祥,牛贺才,于学元,单强,HiroakiSato,JunichiIto.准噶尔板块东北缘富铌玄武岩的发现及其地质意义[J].地质找矿论丛,2003,18(1):71-72. |
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| 作者姓名： | 张海祥 牛贺才 于学元 单强 HiroakiSato JunichiIto |
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| 作者单位： | 1. 中国科学院,广州地球化学研究所,广东,广州,510640
2. 日本神户大学,理学部地球惑星科学教室,神户,657-8501 |
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| 基金项目： | 国家自然科学基金(编号:400073006)，973项目(编号:2001CB409805)联合资助。 |
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| 摘 要： | 富铌玄武岩是硅过饱和,富Ｎａ2Ｏ,ＴｉＯ2,Ｐ2Ｏ5,同时富集高场强元素的一类岛弧玄武岩,这类玄武岩的ｗ(Ｎｂ)>7×10-6,(ｗ(Ｌａ)/ｗ(Ｎｂ))ＭＮ<2。它是由来源于70100ｋｍ深处、受ａｄａｋｉｔｅ熔体交代过的地幔楔橄榄岩部分熔融形成的,是大洋板块俯冲作用的产物。目前发现的富铌玄武岩大多分布在环太平洋新生代岛弧环境,与洋壳俯冲作用密切相关1 5]。本研究在准噶尔板块东北缘富蕴县的索尔库都克附近首次发现了富铌玄武岩。它产于下泥盆统托让格库都克组中、上部。该地层自下而上的岩石组合为:玄武岩 火山凝灰角砾岩 火山集块岩 含…
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| 关 键 词： | 地球化学 洋壳 俯冲作用 新生代 准噶尔板块 富铌玄武岩 |
| 文章编号： | 1001-1412(2003)01-0071-02 |
| 收稿时间： | 2002/12/3 0:00:00 |
| 修稿时间： | 2002年12月3日 |
DISCOVERY OF Nb-RICH BASALT AT THE NORTHEAST MARGIN OF JUNGGAR PLATE AND THE GEOLOGICAL SIGIFICANCE |
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| ZHANG Hai-yang,NIU He-cai,YU Xue-yuan,SHAN Qiang,Hiroaki Sato and Junichi Ito.DISCOVERY OF Nb-RICH BASALT AT THE NORTHEAST MARGIN OF JUNGGAR PLATE AND THE GEOLOGICAL SIGIFICANCE[J].Contributions to Geology and Mineral Resources Research,2003,18(1):71-72. |
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| Authors: | ZHANG Hai-yang NIU He-cai YU Xue-yuan SHAN Qiang Hiroaki Sato and Junichi Ito |
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| Institution: | Guangzhou Geochemical Institute of the Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Geochemical Institute of the Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Geochemical Institute of the Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Geochemical Institute of the Chinese Academy of Sciences, Guangzhou 510640, China;Department of Earth and Planetary Sciences, Faculty of Science, Kobe University, Kobe 657 8501, Japan;Department of Earth and Planetary Sciences, Faculty of Science, Kobe University, Kobe 657 8501, Japan |
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| Abstract: | Nb-rich basalt is discovered for the first time in uoranggekuduke formation of Lower carboniferous series, Fuyun county in the Northeast margin of Junnggar plate. It is derived from depth of 70100 km and formed by partial melted peridodite of the mantle wedge which was replaced by adakite melting material, and is the product of the subduction of the palaco-Asia ocean plate. The discovery implies a south subduction of the palaeo-Asia oceanic crust toward Junggar plate during Early Carboniferous Epoch. |
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