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首页> 外文期刊>Geoscience frontiers >Intra-continental back-arc basin inversion and Late Carboniferous magmatism in Eastern Tianshan, NW China: Constraints from the Shaquanzi magmatic suite
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Intra-continental back-arc basin inversion and Late Carboniferous magmatism in Eastern Tianshan, NW China: Constraints from the Shaquanzi magmatic suite

机译：中国西北天山东部大陆内弧后盆地反转和晚石炭纪岩浆作用：来自沙泉子岩浆组的约束

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The Yamansu belt, an important tectonic component of Eastern Tianshan Mountains, of the Central Asian Orogenic Belt, NW China hosts many Fe–(Cu) deposit. In this study, we present new zircon U-Pb geochronology and geochemical data of the volcanic rocks of Shaquanzi Formation and diorite intrusions in the Yamansu belt. The Shaquanzi Formation comprises mainly basalt, andesite/andesitic tuff, rhyolite and sub-volcanic diabase with local diorite intrusions. The volcanic rocks and diorites contain ca. 315–305?Ma and ca. 298?Ma zircons respectively. These rocks show calc-alkaline affinity with enrichment in large-ion lithophile elements (LILEs), light rare-earth elements (LREEs), and depletion in high field strength elements (HFSEs) in primitive mantle normalized multi-element diagrams, which resemble typical back-arc basin rocks. They show depleted mantle signature with ε Nd ( t ) ranging from?+3.1 to?+5.6 for basa?+2.1 to?+4.7 for andesite;??0.2 to?+1.5 for rhyolite and the ε Hf ( t ) ranges from??0.1 to?+13.0 for andesites;?+5.8 to?+10.7 for andesitic tuffs. We suggest that the Shaquanzi Formation basalt might have originated from a depleted, metasomatized lithospheric mantle source mixed with minor (3–5%) subduction-derived materials, whereas the andesite and rhyolite could be fractional crystallization products of the basaltic magma. The Shaquanzi Formation volcanic rocks could have formed in an intra-continental back-arc basin setting, probably via the southward subduction of the Kangguer Ocean beneath the Middle Tianshan Massif. The Yamansu mineralization belt might have undergone a continental arc to back-arc basin transition during the Late Carboniferous and the intra-continental back-arc basin might have closed in the Early Permian, marked by the emplacement of dioritic magma in the Shaquanzi belt. Graphical abstract Display Omitted Highlights ? Shaquanzi volcanic rocks erupted at 315–305?Ma and diorite emplaced at 298?Ma. ? Intra-continental back-arc basin setting. ? Yamansu belt witnessed continental arc to back-arc basin transition during the Late Carboniferous. ? Intra-continental back-arc basin closure at ca. 300?Ma.
机译：中国西北地区中亚造山带东部天山山脉的重要构造成分Yamansu带拥有许多Fe-（Cu）矿床。在这项研究中，我们提供了新的锆石U-Pb年代学和沙泉子组火山岩以及Yamansu带中闪长岩侵入的地球化学数据。沙泉子组主要包括玄武岩，安山岩/安山岩凝灰岩，流纹岩和次火山辉绿岩，并有局部闪长岩侵入。火山岩和闪长岩含钙。 315–305？Ma和ca. 298？锆石这些岩石在原始地幔归一化多元素图中，显示出与钙离子的亲和力，并富含大离子的亲石元素（LILE），轻稀土元素（LREE）和高场强元素（HFSE）的耗尽，类似于典型的地幔图。后弧盆地岩石。它们显示出枯竭的地幔特征，玄武岩的εNd（t）范围为？+3.1至？+5.6;安山岩的εNd（t）范围为？+2.1至？+4.7;流纹岩的εNd（t）范围为εHd（t）对于安山岩而言，从？0.1至？13.0;对于安山岩凝灰岩而言，由？+5.8至？+10.7。我们认为，沙泉子组玄武岩可能是由贫化，交代的岩石圈地幔源与少量（3-5％）俯冲衍生物质混合而成的，而安山岩和流纹岩可能是玄武岩浆的分步结晶产物。沙泉子组的火山岩可能是在大陆内部的弧后盆地环境中形成的，可能是通过天山中块下方的康古尔海洋向南俯冲而形成的。在石炭纪晚期，Yamansu矿化带可能经历了大陆弧向弧后盆地的过渡，而在二叠纪早期，大陆内部的弧后盆地可能已经关闭，其特征是在沙泉子带中有闪长岩浆的位置。图形摘要显示省略的突出显示？沙泉子火山岩在315-305？Ma喷发，闪长岩在298？Ma喷发。 ？洲内弧后盆地设置。 ？ Yamansu带见证了晚石炭世期间大陆弧向弧后盆地的过渡。 ？洲内弧后盆地封闭在约。 300吗

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