原特提斯洋早古生代幕式弧岩浆活动：来自东昆仑造山带南部深成岩年代学、地球化学和Sr-Nd-Hf同位素的证据

IF 8.9 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research Pub Date : 2026-06-01 Epub Date: 2026-01-26 DOI:10.1016/j.gr.2025.12.022

Xiang Ren , Yunpeng Dong , Inna Safonova , Shengsi Sun , Dengfeng He , Xiaoyan Zhao , Yuangang Yue , Bo Hui , Qiuming Pei , Baoping Gan

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引用次数: 0

摘要

东昆仑造山带南部经历了与原特提斯洋和古特提斯洋有关的长期造山运动。然而，对原特提斯洋的演化仍然知之甚少，留下了俯冲开始和岩浆活动的时间问题。在此基础上，对鄂东南部3个早古生代的克克沙（KKS）和下阿拉文（XLW）辉长闪长岩和龙瓦卡鲁（LWKL）花岗岩体进行了年代学、地球化学和Sr-Nd-Hf同位素研究。KKS石英闪长岩、XLW角闪辉长岩和LWKL花岗岩分别在494、470和477 Ma结晶。KKS辉长-花岗闪长岩系列和XLW角闪长辉长岩富集轻稀土元素和大离子亲石元素，缺乏强场元素。LWKL花岗岩具有高Na2O含量、高Sr/Y、高La/YbN比值和分异重稀土元素特征。同位素上，XLW角闪辉长岩和LWKL花岗岩富集程度较低(εNd(t) = −4.3 ~−3.9；εHf(t) = −4.6 ~ +2.0)优于KKS辉长岩和花岗闪长岩(εNd(t) = −7.0；εHf(t) = −7.2 ~−4.8)。Sr-Nd同位素模拟表明，KKS和XLW岩体是由不同数量的陆源主导的俯冲沉积物衍生熔体修饰的地幔楔的部分熔融形成的。LWKL埃达克花岗岩是由下镀弧型中间岩高压改造而成。早古生代辉长-花岗闪长岩系列和埃达质花岗岩的侵位与不迟于约500 Ma的原特提斯洋俯冲有关。我们的新数据和现有的年龄表明，EKO南部原特提斯洋的超俯冲岩浆活动是幕式的，峰值大约在495,470和430 Ma。前两期岩浆活动主要代表富集地幔楔的熔融作用，第三期岩浆活动是多源地壳岩、俯冲洋板和地幔楔同时熔融作用形成的岩浆活动主脉冲。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Episodic early Paleozoic arc magmatism of the Proto-Tethys Ocean: Evidence from geochronology, geochemistry and Sr-Nd-Hf isotopes of plutonic rocks in the southern East Kunlun Orogen

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Episodic early Paleozoic arc magmatism of the Proto-Tethys Ocean: Evidence from geochronology, geochemistry and Sr-Nd-Hf isotopes of plutonic rocks in the southern East Kunlun Orogen

The southern East Kunlun Orogen (EKO) experienced protracted orogeny linked to the Proto-Tethys and Paleo-Tethys oceans. However, the evolution of the Proto-Tethys Ocean remains much less understood leaving the question of the timing of subduction initiation and magmatism. Here, we studied three early Paleozoic plutons exposed in the southern EKO: Kekesha (KKS) and Xialawen (XLW) gabbro-dioritic plutons and Longwakalu (LWKL) granitic pluton for geochronology, geochemistry and Sr-Nd-Hf isotopes. A KKS quartz diorite, XLW hornblende gabbro, and LWKL granite crystallized at 494, 470 and 477 Ma, respectively. The KKS gabbro-granodiorite series and XLW hornblende gabbros are enriched in light rare earth elements and large ion lithophile elements, but depleted in high strength field elements. The LWKL granites possess adakitic features: high Na₂O content, Sr/Y and La/Yb_N ratios and differentiated heavy REEs. Isotopically, XLW hornblende gabbros and LWKL granites are less enriched isotopes (εNd_(t) = −4.3 to −3.9; εHf_(t) = −4.6 to +2.0) than KKS gabbro and granodiorite (εNd_(t) = −7.0; εHf_(t) = −7.2 to −4.8). Sr-Nd isotopic modeling suggests that KKS and XLW plutons were derived through partial melting of mantle wedge modified by different amounts of subducted terrigenous-dominated sediment derived melts. The LWKL adakitic granites were formed by high-pressure reworking of underplated arc-type intermediate rocks. The emplacement of early Paleozoic gabbro-granodiorite series and adakitic granites was related to subduction of the Proto-Tethys Ocean which started no later than ca. 500 Ma. Our new data along with available ages suggest that the supra-subduction magmatism of the Proto-Tethys Ocean in the southern EKO is episodic with peaks at ca. 495, 470, and 430 Ma. The first two episodes of magmatism mainly represent melting of enriched mantle wedge, and the third is the main pulse of magmatism formed by simultaneous melting of multiple sources of crustal rocks, subducted oceanic slab and mantle wedge.

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来源期刊

Gondwana Research 地学-地球科学综合

CiteScore

12.90

自引率

6.60%

发文量

298

审稿时长

65 days

期刊介绍： Gondwana Research (GR) is an International Journal aimed to promote high quality research publications on all topics related to solid Earth, particularly with reference to the origin and evolution of continents, continental assemblies and their resources. GR is an "all earth science" journal with no restrictions on geological time, terrane or theme and covers a wide spectrum of topics in geosciences such as geology, geomorphology, palaeontology, structure, petrology, geochemistry, stable isotopes, geochronology, economic geology, exploration geology, engineering geology, geophysics, and environmental geology among other themes, and provides an appropriate forum to integrate studies from different disciplines and different terrains. In addition to regular articles and thematic issues, the journal invites high profile state-of-the-art reviews on thrust area topics for its column, ''GR FOCUS''. Focus articles include short biographies and photographs of the authors. Short articles (within ten printed pages) for rapid publication reporting important discoveries or innovative models of global interest will be considered under the category ''GR LETTERS''.