| 新疆塔克札勒蛇绿混杂岩中玄武质熔岩地球化学特征及其成因讨论 |
| |
| 引用本文： | 卜国民,李华启,李文铅,俞亨祥,金辉.新疆塔克札勒蛇绿混杂岩中玄武质熔岩地球化学特征及其成因讨论[J].大地构造与成矿学,2005,29(2):252-261. |
| |
| 作者姓名： | 卜国民 李华启 李文铅 俞亨祥 金辉 |
| |
| 作者单位： | 中国科学院广州地球化学研究所与南海海洋研究所,边缘海地质重点实验室,广东,广州,510640;桂林工学院,广西,桂林,510004;河南省地质矿产勘查与开发局第二地质勘查院,河南,许昌,416000 |
| |
| 基金项目： | 国家重点基础研究发展计划(973计划)，中国科学院知识创新工程项目 |
| |
| 摘 要： | 塔克札勒蛇绿混杂岩玄武岩的SiO2 和MgO高,同时较富集Cr、Ni及Co等过渡族元素,具有玻安岩特征;微量元素以富集LILE(Ba,Rb,Sr等)而亏损HFSE(Nb、Ta、Zr、Hf等)为特征;该玄武岩具LREE平坦或弱亏损、HREE亏损的分配型式;构造环境判别图解指示该玄武岩形成于弧前环境。地球化学特征与其它地质特征表明该蛇绿岩代表了古亚洲洋消亡过程中的洋壳残片。
|
| 关 键 词： | 蛇绿混杂岩 地球化学 弧前环境 塔克札勒 |
| 文章编号： | 1001-1552(2005)02-0252-10 |
| 修稿时间： | 2004年3月1日 |
GEOCHEMICAL CHARACTERISTICS AND TECTONIC SETTINGS FOR BASALTS IN TAKEZHALE OPHIOLITE IN EAST JUNGGAR, XINJIANG |
| |
| BU Guomin,LI Huaqi,LI Wenqian,YU Hengxiang,JIN Hui.GEOCHEMICAL CHARACTERISTICS AND TECTONIC SETTINGS FOR BASALTS IN TAKEZHALE OPHIOLITE IN EAST JUNGGAR, XINJIANG[J].Geotectonica et Metallogenia,2005,29(2):252-261. |
| |
| Authors: | BU Guomin LI Huaqi LI Wenqian YU Hengxiang JIN Hui |
| |
| Abstract: | The basalts in Takezhale ophiolitic mélange show the characteristics of boninite, i.e., being characterized by high SiO_2, MgO and enrichment in transition elements such as Cr, Ni and Co etc. The spider diagram for trace elements indicates that they are enriched in LILE (Ba, Rb, Sr etc.) but are depleted in HFSE (Nb, Ta, Zr, Hf etc.). The REE distributions show flat LREE trends but HREE-depleted patterns. Discrimination diagrams demonstrate that the basalts were formed in forearc in terms of tectono-environment. Geochemical and other geological features suggest that the ophiolitic mélange represents the ocean crust tags resulted from the withering away of the Palaeo-Asian ocean. |
| |
| Keywords: | ophiolite geochemistry fore-arc tectono-environment Takezhale |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
