Accretionary orogens function as crucial sites for the generation of arc igneous rocks and continental crust, but the spatial and temporal distribution of arc igneous rocks and the link between the arc magmatic processes and crust generation within individual orogens remains poorly constrained. To address this issue, we have summarized published geochemical and zircon isotopic data for Paleozoic (∼460–280 Ma) mafic–intermediate–felsic igneous rocks within five individual belts from the Chinese Eastern Tianshan of the southern Central Asian Orogenic Belt (CAOB), which aim to explore the variations in magma sources (juvenile or reworked crust) and crustal thickness in response to tectonic and crustal evolution over time. This summary highlights the systematic variation in elemental and isotopic signatures of magmas in the Eastern Tianshan and makes it possible to quantitatively evaluate the crustal evolution and tectonic switch patterns. Repeated tectonic switches of the Eastern Tianshan trench-arc-basin system during subduction of the Kangguer oceanic plate appear to have occurred in two phases of the northern trench advance (ca. 460–381 Ma and 330–301 Ma, respectively) and the intervening trench retreat (ca. 380–331 Ma), as well as seem to have happened in the southern trench of the Kangguer Ocean with trench southward advance and northward retreat at ca. 360–331 Ma and 330–301 Ma, respectively. The estimated crustal growth in the Eastern Tianshan various from trench advance accompanied by significant crustal thickening (i.e., northern trench advance at ca. 460–421 Ma and southern trench advance at ca. 360–331 Ma, respectively) to northern trench retreat with crustal thinning (ca. 380–331 Ma). Most of the magma in the Eastern Tianshan was generated by crustal reworking or mixing.

中文翻译：

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追溯中东天山海沟-弧-盆地系统的俯冲和增生历史：古生代岩浆和地壳演化的见解

增生造山带是形成弧火成岩和大陆地壳的关键场所，但弧火成岩的时空分布以及单个造山带内弧岩浆过程与地壳生成之间的联系仍然很少受到限制。为了解决这个问题，我们总结了中亚造山带南部（CAOB）中东天山五个单独带内古生代（∼460-280 Ma）镁铁质-中质-长英质火成岩的地球化学和锆石同位素数据，其目的是探索岩浆来源（新生地壳或改造地壳）和地壳厚度随时间的构造和地壳演化的变化。该总结强调了东天山岩浆元素和同位素特征的系统变化，使得定量评估地壳演化和构造转换模式成为可能。康古尔洋板块俯冲过程中东天山海沟-弧-盆地系统的反复构造转换似乎发生在北部海沟推进的两个阶段（分别约为460-381 Ma和330-301 Ma）和其间海沟后退（约 380-331 Ma），以及康古尔洋南海沟似乎发生了海沟南进和北退的情况（约 380 Ma）。分别为 360–331 Ma 和 330–301 Ma。估计东天山的地壳生长从海沟推进伴随地壳显着增厚（即北海沟推进时间分别为约 460-421 Ma 和南海沟推进时间为约 360-331 Ma）到北海沟伴随地壳后退。变薄（约 380–331 Ma）。东天山的岩浆大部分是由地壳改造或混合产生的。