| 阿尔泰东部新生代火山岩的地球化学特点及构造环境 |
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| 引用本文： | 王登红,李天德.阿尔泰东部新生代火山岩的地球化学特点及构造环境[J].大地构造与成矿学,2001,25(3):282-289. |
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| 作者姓名： | 王登红 李天德 |
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| 作者单位： | 1. 中国地质科学院矿产资源研究所,
2. 新疆地质矿产研究所, |
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| 基金项目： | 国家"305"科技攻关项目,国家重点基础研究发展计划(973计划),96-915-0l-02,G1999043203,, |
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| 摘 要： | 新疆三大山系均有新生代火山岩,其中南部西昆仑、阿尔金山及天山托云等地的新生代火山岩比较发育,在新疆东北部地区的阿尔泰哈拉乔拉一带也发育新生代的陆内喷发火山岩。这套火山岩虽然面积不是很大,但具有大陆溢流玄武岩的特点。在地球化学上也具有典型热点成因洋岛玄武岩或其它地幔柱成因玄武岩的特点,如TiO2含量高大于2%、轻稀土元素和不相容元素显著富集等。表明新疆北部特别是阿尔泰造山带东部演化到新生代以后,有向裂陷拉张方向演化的趋势,标志着一个新的大地构造演化阶段的到来。
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| 关 键 词： | 新生代大陆溢流玄武岩 地球化学 构造环境 新疆阿尔泰 |
| 文章编号： | 1001-1552(2001)03-282-08 |
| 修稿时间： | 2001年2月11日 |
GEOCHEMISTRY AND ENVIRONMENT OF THE CENOZOIC BASALTS IN HALAQIAOLA, EAST ALTAI MOUNTAINS |
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| Abstract: | Cenozoic volcanic rocks exist in the Kunlun,Tianshan and Altai mountain s,both of those in the Kunlun and Tianshan mountains have been known to geologists,while the Cenozoic basalts in the Halaqiaola area,East Altai,have not been studied by now.This paper presents the contents of major elements,minor elements,and rare earth elements in the basalts fr om Halaqiaola.This series of Cenozoic volcanic rocks has obvio us features of continental flood basalts,even its distribution is not widely.It’s high content of TiO 2 (greater than 2wt%),high content of large-ion lithophi le elements and high fieldstrength ele ments such as Nb,Ta,Zr and Hf,and its rare earth elements geochemistry show an environment of rifting,but at its initial stage of r ift.Diagram analysis proved the Halaqiaola basalts to be originated from a mantle plume or part of the Altai-Baikal Lake mantle plume,which has produced the deepest rift lake in the Eurasian continent .The eruption of the Halaqiaola Cenozoic continental fl ood basalts may mark the beginning of a new episode of continental evolution in the Altai mountains. |
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| Keywords: | Continental flood basalt(CFB) Miocene geochemistry tectonic e nvironment Altai Xinjiang |
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