阴山地块南缘早古元古代弧后系统——来自孔达岩带大青山杂岩新定义的双峰火山序列的证据

IF 1.9 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
X. Wang, Jian Zhang, C. Yin, Hai Zhou, Jin Liu, Wenxia Zhang, Shuhui Zhang, Chen Zhao, Changquan Cheng
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引用次数: 3

摘要

华北克拉通孔达岩带是连接哥伦比亚超大陆的2.1~1.9Ga造山带之一,是由阴山地块与鄂尔多斯地块碰撞形成的典型大陆-大陆碰撞造山带。以前的研究大多集中在孔达利特带的碰撞事件上,但很少关注俯冲系统在海洋最终关闭前的运作。为了解决这个问题,我们在大青山杂岩中确定了一系列层间变镁铁质和长英质岩石组合,并进行了地球化学和地质年代分析。岩石学和地球化学研究表明,这些岩石是双峰岩石,包括斜长石角闪岩(第1组)和黑云母斜长岩(第2组)。从地球化学角度来看,第1组样品显示出拉斑玄武岩的亲和力,而第2组样品属于高钾钙碱性系列。地球化学数据表明,第1组的原岩岩浆很可能来源于岩石圈地幔的部分熔融,地壳污染较小,而第2组岩石代表了来自古代地壳物质部分熔融的高分化岩浆。所有样品均显示HFSE的贫化和LILE的富集,表明存在俯冲相关的岩浆弧环境。锆石U-Pb定年结果表明,第1组样品的原岩产生约2.47 Ga的结晶年龄和1.95至1.85 Ga的变质年龄,而第2组样品的原石产生约2.40 Ga的晶化年龄和约1.85 Ga,同位素资料表明,大青山杂岩双峰火山序列发育于阴山地块南缘2.47~2.40 Ga的弧后系统中。鄂尔多斯地块和阴山地块之间随后的碰撞导致了孔达利特带的形成,以及1.95至1.85 Ga之间西部地块的最终合并。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Early Paleoproterozoic back-arc system along the southern margin of the Yinshan Block: Evidence from a newly-defined bimodal volcanic sequence in the Daqingshan Complex, Khondalite Belt
As one of the 2.1 to 1.9 Ga orogenic belts that welded the Columbia supercontinent, the Khondalite Belt in the North China Craton is a typical continent-continent collisional orogen that formed through the collision between the Yinshan and Ordos Blocks. Previous studies mostly focused on the collisional event in the Khondalite Belt but paid little attention to how the subduction system operated before the final closure of the ocean. To address this issue, we identified a series of interlayered meta-mafic and felsic rock assemblages in the Daqingshan Complex and implemented geochemical and geochronological analyses. Petrological and geochemical studies revealed that these rocks are bimodal and include plagioclase amphibolite (Group 1) and biotite plagiogneiss (Group 2). Geochemically, Group 1 samples show tholeiitic affinity, whereas Group 2 samples belong to the high-K calc-alkaline series. Geochemical data indicate that the protolith magma of Group 1 was most likely derived from the partial melting of lithospheric mantle with minor crustal contamination, whereas Group 2 rocks represent highly differentiated magma derived from the partial melting of ancient crustal materials. All the samples show depletion of HFSEs and enrichment of LILEs, indicative of a subduction-related magmatic arc environment. Zircon U-Pb dating results show that the protoliths of Group 1 samples yield crystallization ages of ∼2.47 Ga and metamorphic ages of 1.95 to 1.85 Ga, whereas the protoliths of Group 2 samples yield crystallization ages of ∼2.40 Ga and metamorphic ages of ∼1.85 Ga. Our new results and available geochemical, petrological, and isotopic data demonstrate that the bimodal volcanic sequence of the Daqingshan Complex was developed in a 2.47 to 2.40 Ga back-arc system along the southern margin of Yinshan Block. Subsequent collision between the Ordos and Yinshan Blocks resulted in the formation of the Khondalite Belt and final amalgamation of the Western Block between 1.95 and 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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