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中祁连党河南山碱性系列岩浆岩埃达克岩成因及其对俯冲带壳幔相互作用的启示

武美云, 王超, 李航, 喻遵谱, 郝江波, 孙晓奎, 马得青, 张帅, 李雪

武美云, 王超, 李航, 等. 中祁连党河南山碱性系列岩浆岩埃达克岩成因及其对俯冲带壳幔相互作用的启示[J]. 西北地质, 2022, 55(1): 19-38. DOI: 10.19751/j.cnki.61-1149/p.2022.01.002
引用本文: 武美云, 王超, 李航, 等. 中祁连党河南山碱性系列岩浆岩埃达克岩成因及其对俯冲带壳幔相互作用的启示[J]. 西北地质, 2022, 55(1): 19-38. DOI: 10.19751/j.cnki.61-1149/p.2022.01.002
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WU Meiyun, WANG Chao, LI Hang, et al. Petrogenesis of Magmatic Rocks and Adakite of Alkaline Series from Danghenanshan Area in Central Qilian Belt: Implications for Crust-Mantle Interaction in Subduction Zone[J]. Northwestern Geology, 2022, 55(1): 19-38. DOI: 10.19751/j.cnki.61-1149/p.2022.01.002
Citation: WU Meiyun, WANG Chao, LI Hang, et al. Petrogenesis of Magmatic Rocks and Adakite of Alkaline Series from Danghenanshan Area in Central Qilian Belt: Implications for Crust-Mantle Interaction in Subduction Zone[J]. Northwestern Geology, 2022, 55(1): 19-38. DOI: 10.19751/j.cnki.61-1149/p.2022.01.002
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中祁连党河南山碱性系列岩浆岩埃达克岩成因及其对俯冲带壳幔相互作用的启示

  • 大陆动力学国家重点实验室, 西北大学地质学系, 陕西 西安 710069

基金项目: 

国家自然科学基金（41672187，42030307）和科技部大陆动力学国家重点实验室课题资助。

详细信息
    作者简介:

    武美云(1995-),女,矿物学、岩石学、矿床学专业硕士研究生。E-mail:1749605640@qq.com。

    通讯作者:

    王超(1979-),男,副研究员,博士生导师,主要从事岩石学与前寒武纪地质研究工作。E-mail:chaowang@nwu.edu.cn。

  • 中图分类号: P518;P588

Petrogenesis of Magmatic Rocks and Adakite of Alkaline Series from Danghenanshan Area in Central Qilian Belt: Implications for Crust-Mantle Interaction in Subduction Zone

  • State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China

摘要

    摘要
  • 摘要: 碱性系列岩浆岩和埃达克岩是通常产生于汇聚板块边缘的特殊岩石类型，记录了俯冲物质与地幔橄榄岩相互作用的过程。笔者对中祁连南缘党河南山地区贾公台杂岩体和鸡叫沟岩体进行了岩石学、地球化学和锆石U-Pb年代学研究。LA-ICP-MS锆石U-Pb定年表明，鸡叫沟岩体中的二长闪长岩形成于（467±4.7）Ma，贾公台岩体花岗闪长岩形成于（445±4.3）Ma。地球化学分析结果表明，鸡叫沟杂岩体中角闪辉石岩、辉长岩和二长闪长岩整体上具有富K、富Na的特征，均属于碱性系列岩浆岩，具有钾玄岩特征；岩体中不同岩石类型具有相似的微量元素配分型式，富集Sr、Nb、LILE和LREE等，岩浆源区存在金红石残留，其形成过程与弧地幔楔底部富碱的俯冲沉积物和地幔橄榄岩混合、熔融有关。贾公台花岗闪长岩属于中钾钙碱性系列，Na2O/K2O值大于2.5，样品具有高Sr（>400×10-6）、低Y（<7×10-6）的特征，高Sr/Y值（>70）和La/Yb值（>22）具有高硅埃达克岩特征，与俯冲洋壳的榴辉岩相部分熔融有关，源区存在石榴子石残留特征。党河南山碱性岩浆岩-埃达克岩组合指示了俯冲物质深部熔融的特点（大于50~100 km），揭示了该地区强烈的壳幔相互作用过程，表明俯冲沉积物和俯冲洋壳可以为弧岩浆侵入体形成提供直接的物质来源，进一步说明俯冲物质和地幔橄榄岩相互作用可能是岛弧地壳生长的方式之一。
    Abstract: Magmatic rocks and adakite of alkaline series, often at the convergent plate boundaries, witness the interaction process between subduction material and mantle peridotite. This investigation of zircon U-Pb dating and whole-rock geochemistry of the Jiagongtai and Jijiaogou plutons in the western Central Qilian belt provides new insights into crust-mantle interaction in subduction zone. LA-ICP-MS zircon dating shows that monzodiorite of the Jijiaogou pluton and granodiorite of the Jiagongtai pluton formed at about (467±4.7) Ma and (445±4.3) Ma, respectively.The compositions of Jijiaogou pluton are alkaline series with the characteristics of shoshonite. The different rock types of Jijiaogou pluton have similar trace element patterns and are enriched in Sr、Nb、LILE and LREE, which shows residual rutile in the magma source. The Jijiaogou alkaline series rocks are generated from hybrid alkali-rich subduction sediments and mantle peridotite at the sub-arc mantle wedge. The Jiagongtai granodiorite is medium potassium calc-alkaline series, with Na2O/K2O greater than 2.5; the samples show the characteristics of high Sr (>400×10-6), low Y (<7×10-6), high ratios of Sr/Y (>70) and La/Yb (>22). The Jiagongtai pluton represents high-SiO2 adakite, formed by partial melting of the subducted oceanic crust under eclogite-facies condition, and left garnet residue in the source. The alkaline magma and adakite in Danghenanshan indicate the characteristic of deep melting of subducted materials (greater than 50~100 km) and intense crust-mantle interaction in the source. It further indicates that subducted sediments and oceanic crust can provide a direct material source for the formation of arc magma, and the interaction between subduction material and mantle peridotite may be one of the ways of arc crust growth.
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  • 收稿日期:  2021-01-04
  • 修回日期:  2021-06-22
  • 网络出版日期:  2022-07-28
  • 发布日期:  2022-03-04

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