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新疆库尔勒上户地区辉绿岩的地球化学特征及成因
Geochemical features and petrogenesis of the Shanghu diabase, Kuerle, Xinjiang

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张海军 1,2,3   李宁波 2,4 *  
文摘 新疆库尔勒上户地区位于塔里木盆地北缘,该地区出露有近南北向分布的辉绿岩岩脉.该岩石主要由斜长石(65%)和单斜辉石(30%)组成,具有典型的辉绿结构,并且后期变质蚀变较弱.上户辉绿岩具有较低的Si02 (49.00%~50.29%),较高的MgO (7.15%~8.07%)和Ti02 (1.32%~1.56%)含量,暗示其源自地幔.元素地球化学研究表明,上户辉绿岩更可能是地幔辉石岩部分熔融的产物,而地幔辉石岩的存在则表明该地区岩石圈地幔曾遭受过俯冲熔体的交代.Dy/Yb (1.81~1.90), Sm/Nd (0.26~0.27)和Nb/Zr (0.04~0.05)等地球化学参数表明上户辉绿岩的源区存在石榴子石,但是其低且稳定的Sm/Sr比值(0.010~0.015)则暗示该源区具有较高的单斜辉石/石榴子石比值.因此,上户辉绿岩是源自具有高单斜辉石/石榴子石比值的辉石岩,而这种辉石岩则是板块俯冲形成的高硅熔体交代地幔的产物.综合区域地质资料和岩石地球化学数据分析,我们认为上户辉绿岩形成在大陆边缘环境,古亚洲洋闭合或塔里木地幔柱活动诱发的区域伸展是导致其形成的重要因素.
其他语种文摘 The nearly N-S trending Shanghu diabase dikes are distributed on the north margin of the Tarim Craton, Kuerle, Xinjiang province. The diabase is primarily composed of clinopyroxene (30%) and plagioclase (65%), and has undergone negligible post-emplacement alteration. The Shanghu diabase could be derived from a mantle source due to its low SiO_2 (49.00%~50.29%) but high MgO (7.15%~8.07%) and TiO_2 (1.32%~1.56%) contents. Based on the geochemical characteristics, we propose that the mantle source of the Shanghu diabase was pyroxenite-bearing and metasomatised by subducted-related melts. Using the Dy/Yb (1.81 ~1.90),Sm/Nd (0.26~0.27),Nb/Zr(0.04~0.05),and Sm/Sr (0.01 ~0.015) of the Shanghu diabase, we propose that the Shanghu diabase was derived from a mantle source. The latter was metasomatized by a silicate rich melt, as it contains some garnet but has a high clinopyroxene/garnet ratio. Given the regional geology and these geochemical data, we propose the Shanghu diabase may have formed in a continental margin setting, where regional extension, triggered by mantle plume activity or closure of Paleo- Asian Ocean, would have played a critical role in the genesis of the Shanghu diabase.
来源 地球化学 ,2018,47(2):196-208 【核心库】
关键词 辉绿岩 ; 辉石岩地幔 ; 岩石成因 ; 地幔交代 ; 库尔勒
地址

1. 中国科学院大学, 北京, 100049  

2. 中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广东, 广州, 501640  

3. 新疆维吾尔自治区地质矿产勘查开发局第二地质大队, 新疆, 库尔勒, 841000  

4. 广东省矿物物理与矿物材料重点实验室, 广东省矿物物理与矿物材料重点实验室, 广东, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 0379-1726
学科 地质学
基金 国家自然科学基金 ;  新疆自治区地质勘查基金
文献收藏号 CSCD:6195643

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引证文献 1

1 谢明材 塔里木北缘与碱性岩有关的稀有一稀土矿床成矿作用研究 地质科学,2020,55(2):420-438
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