[1]马 鑫,但 卫,王 强.2022.中帕米尔塔什库尔干早白垩世二云母花岗岩与中-基性包体的岩石成因及其地质意义.大地构造与成矿学,46(2):380-397.doi:10.16539/j.ddgzyckx.2022.02.012
 MA Xin,DAN Wei,WANG Qiang.2022.Petrogenesis of the Taxkorgan Early Cretaceous Two-mica Granites and Medium-mafic Magmatic Enclaves in the Central Pamir and Their Geological Significance.Geotectonica et Metallogenia,46(2):380-397.doi:10.16539/j.ddgzyckx.2022.02.012


《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]



Petrogenesis of the Taxkorgan Early Cretaceous Two-mica Granites and Medium-mafic Magmatic Enclaves in the Central Pamir and Their Geological Significance
马 鑫1、2 但 卫1、3 王 强1、3 杨亚楠1、3 唐国荣1、2 唐功建1、3*
1. 中国科学院 广州地球化学研究所, 同位素地球化学国家重点实验室, 广东 广州 510640; 2. 中国科学院大学, 北京 100049; 3. 中国科学院深地科学卓越创新中心, 广东 广州 510640
MA Xin1、2 DAN Wei1、3 WANG Qiang1、3 YANG Yanan1、3 TANG Guorong1、2 TANG Gongjian1、3*
1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, Guangdong, China
二云母花岗岩 大陆边缘弧 岩浆爆发 塔什库尔干 帕米尔
two-mica granite continental margin arc magmatic flare-up Taxkorgan Pamir
P595; P597
中-南帕米尔在早白垩世发生了岩浆爆发事件, 出露的花岗质岩基规模巨大并且分布广泛。这些白垩纪花岗质岩石为钙碱性系列, 具有弧岩浆岩的微量元素特征, 可能形成于Shyok洋和/或新特提斯洋的北向俯冲环境, 但其岩石成因与动力过程仍然不清楚。本文对中帕米尔塔什库尔干地区的二云母花岗岩与中-基性包体开展了二次离子质谱(SIMS)锆石U-Pb年代学、岩相学、全岩主微量元素和Sr-Nd同位素地球化学研究。塔什库尔干二云母花岗岩与中-基性包体形成时代分别为112.8±2.7 Ma和116.1±4.2 Ma, 与早白垩世岩浆爆发期同期。二云母花岗岩具有高的SiO2(71.79%~72.91%)、 K2O(4.60%~6.03%)和低的MgO(0.30%~0.53%)含量, 总体显示弱过铝质特征(A/CNK=1.04~1.11)。岩石富集轻稀土元素和大离子亲石元素, 亏损Nb、Ta、Ti, 具有弧岩浆岩微量元素特征, 以及富集的Sr-Nd同位素组成((87Sr/86Sr)i=0.707916~ 0.721691, εNd(t)= -10.4 ~ -10.1)。岩相学与地球化学特征表明其为S型花岗岩, 源区主要为变杂砂岩, 通过水致白云母部分熔融形成。中-基性包体的主量元素含量变化较大(SiO2=44.91%~56.61%, MgO=4.75%~9.80%); 轻重稀土分异明显, 无Eu异常; 微量元素组成显示不同程度的亏损Nb和Ta; 具有较为富集并且变化较大的Sr-Nd同位素特征((87Sr/86Sr)i=0.703927~ 0.707694; εNd(t)= -5.9 ~ -0.7)。通过分析认为Shyok洋和/或新特提斯洋的俯冲沉积物发生部分熔融, 熔体与上覆的新生岩石圈地幔发生交代反应, 交代的辉石岩经历部分熔融形成具洋岛玄武岩微量元素特征的基性岩浆, 岩浆上升形成基性包体。基性岩浆在侵位过程中同化混染了大陆下地壳, 形成闪长质包体。推测中-南帕米尔地区早白垩世岩浆爆发可能与地幔楔熔体的底侵作用所导致的地壳广泛熔融有关。
A magma flare-up occurred in the Central and South Pamir during the Early Cretaceous as evidenced by the widely distributed granitic batholiths. These Cretaceous granitoid rocks are calc-alkaline series with arc-like trace element signatures. They may be formed in the northward subduction environment of the Shyok Ocean and/or the Neo-Tethys, but their petrogenesis and dynamical processes are still unclear. In this paper, we present the secondary ion mass spectrometry (SIMS) zircon U-Pb geochronological, petrographical, whole rock major and trace elements, Sr-Nd isotopic geochemical data of the Taxkorgan two-mica granites and medium-mafic magmatic enclaves of the Central Pamir. The Taxkorgan two-mica granites and medium-mafic magmatic enclaves were formed at 112.8±2.7 Ma and 116.1±4.2 Ma, respectively, which coincided with the Early Cretaceous magmatic flare-up. The Taxkorgan two-mica granites have high SiO2 (71.79% - 72.99%), K2O (4.60% - 6.03%) and low MgO (0.30% - 0.53%) content. They generally have weak peraluminous characteristics (A/CNK = 1.04 - 1.11). The two-mica granites are enriched in light rare earth elements and large ion lithophile elements, but depleted in Nb, Ta and Ti. They are characterized by arc-like trace element characteristics and enrichment in Sr-Nd isotopes ((87Sr/86Sr)i = 0.707916 - 0.721691, εNd(t) = -10.4 - -10.1). The petrographic and geochemical characteristics indicate that the Taxkorgan two-mica granites are S-type granites, and the magma source is mainly composed of metagreywacke, which was produced by fluid-fluxed muscovite melting. The major elements in the medium-mafic magmatic enclaves are variable (SiO2 = 44.91% - 56.61%; MgO = 4.75% - 9.80%). The light and heavy rare earth element fractionation is obvious, and there is no Eu anomaly. In the trace element diagrams, the medium-mafic magmatic enclaves have different degrees of Nb and Ta depletions. The Sr-Nd isotopic characteristics of these rocks are relatively enriched and varied greatly ((87Sr/86Sr)i = 0.703927 - 0.707694; εNd(t) = -5.9 - -0.7). We suggest that the subducted sediments of the Shyok Ocean and/or the Neo-Tethys Ocean were partially melted, and the melt underwent a metasomatic reaction with the overlying juvenile lithospheric mantle. The metasomatic pyroxenes underwent partial melting to form a mafic magma with the trace element characteristics of ocean island basalt, and the magma rose to form the mafic magmatic enclaves. The mafic magma assimilated the continental lower crust during the emplacement process and eventually formed the dioritic enclaves. The early Cretaceous magmatic flare-up in the Central-South Pamir area may be related to the extensive melting of the crust caused by the underplating of the mantle wedge melt.


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收稿日期: 2021-02-08; 改回日期: 2021-03-22
项目资助: 新疆维吾尔自治区重大科技专项(202101679)和国家自然科学基金项目(41722205、41673033)联合资助。
第一作者简介: 马鑫(1994-), 男, 硕士研究生, 岩石地球化学专业。E-mail: 549768803@qq.com
通信作者: 唐功建(1979-), 男, 研究员, 从事岩石学与地球化学研究工作。E-mail: tanggj@gig.ac.cn
更新日期/Last Update: 2022-04-10