华北克拉通孔雀岩带大青山杂岩TTG花岗岩体成因及构造意义

IF 1.9 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY American Journal of Science Pub Date : 2021-06-01 DOI:10.2475/06.2021.02
X. Wang, Jian Zhang, C. Yin, Hai Zhou, Jin Liu, Xiaoguang Liu, Chen Zhao
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引用次数: 4

摘要

孔雀岩带位于华北克拉通西地块,是与华北克拉通最终拼合相联系的三个古元古代构造带之一。目前流行的一种模式是,孔达利岩带是在~ 1.95 Ga由阴山地块与鄂尔多斯地块碰撞形成的。然而,对碰撞前洋俯冲的起始及其相关的弧岩浆活动和增生过程却知之甚少。大青山杂岩位于孔达利岩带的中东部,具有高度变形变质的岩石组合,是破解上述问题的关键区域。本文对大青山杂岩TTG花岗岩进行了岩石学、地球化学和年代学分析。3个典型TTG样品的锆石U-Pb上截距年龄分别为2545±50 Ma、2484±68 Ma和2452±32 Ma,表明TTG花岗岩类的侵位时间为新太古代晚期。两个变质锆石样品的207Pb/206Pb加权平均年龄分别为1892±53 Ma和1906±27 Ma,记录了大陆与大陆碰撞事件的时间。13个TTG花岗岩样地球化学特征为低、中、高钾钙碱性,具有偏铝质至过铝质倾向,富集Rb、Ba、La、Ce、Nd等大离子亲石元素,贫Nb、Ta等高场强元素。球粒陨石归一化稀土元素(REE)模式显示分异,(La/Yb) N比值在8.20 ~ 27.47之间,弱Eu负异常(δEu = 0.50 ~ 0.98)。此外,大青山杂岩体的TTG花岗岩体属于i型花岗岩体,其火成岩原岩与俯冲相关的岩浆弧环境密切相关。新的研究结果表明,自~ 2.55 Ga以来,阴山地块南缘发生了初始洋岩石圈俯冲,形成了与弧相关的同世TTG花岗岩类。在1.95 ~ 1.85 Ga,海洋的封闭导致了阴山地块与鄂尔多斯地块的最终碰撞和西部地块的合并。
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Petrogenesis and tectonic implications of TTG granitoids from the Daqingshan Complex of the Khondalite Belt, North China Craton
Located in the Western Block of the North China Craton, the Khondalite Belt is one of the three Paleoproterozoic tectonic belts that were linked to the final assembly of the craton. At present, a popular model is that the Khondalite Belt was formed by the collision between the Yinshan and Ordos blocks at ∼1.95 Ga. However, the initiation of oceanic subduction and its related arc magmatism and accretionary process before the collisional event were poorly constrained. The Daqingshan Complex is located in the middle East part of the Khondalite Belt, and contains highly deformed and metamorphosed rock assemblages, and thus represents a key area to decipher the above issue. In this study, we carried out petrological, geochemical and geochronological analysis on the TTG granitoids of the Daqingshan Complex. Zircon U-Pb results from three typical TTG samples yielded upper intercept ages of 2545 ± 50 Ma, 2484 ± 68 Ma and 2452 ± 32 Ma, indicating that the TTG granitoids were emplaced in the late Neoarchean. Metamorphic zircons from two samples gave 207Pb/206Pb weighted mean ages of 1892 ± 53 Ma and 1906 ± 27 Ma, respectively, recording the timing of a continent-to-continent collisional event. Thirteen TTG granitoid samples are geochemically low-, medium- and high-K calc-alkaline, with metaluminous to peraluminous trends and are enriched in large-ion lithophile elements (LILEs) such as Rb, Ba, La, Ce, Nd, and depleted in high field strength elements (HFSEs) such as Nb and Ta. Chondrite-normalized rare earth element (REE) patterns show fractionation with (La/Yb) N ratios ranging from 8.20 to 27.47, with weak Eu negative anomalies (δEu = 0.50 – 0.98). In addition, TTG granitoids of the Daqingshan Complex belong to I-type granitoids, and their igneous protoliths were intimately related to a subduction-related magmatic arc environment. New results of this study reveal that the initial oceanic lithosphere subduction operated since ∼2.55 Ga along the southern margin of the Yinshan Block, and generated the coeval arc-related TTG granitoids. Closure of the ocean led to the final collision between the Yinshan and Ordos blocks and the amalgamation of the Western Block at 1.95 to 1.85 Ga.
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来源期刊
American Journal of Science
American Journal of Science 地学-地球科学综合
CiteScore
5.80
自引率
3.40%
发文量
17
审稿时长
>12 weeks
期刊介绍: The American Journal of Science (AJS), founded in 1818 by Benjamin Silliman, is the oldest scientific journal in the United States that has been published continuously. The Journal is devoted to geology and related sciences and publishes articles from around the world presenting results of major research from all earth sciences. Readers are primarily earth scientists in academia and government institutions.
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