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首页> 外文期刊>Mineralogy and Petrology >Subducting sediment-derived arc granitoids: evidence from the Datong pluton and its quenched enclaves in the western Kunlun orogen, northwest China
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Subducting sediment-derived arc granitoids: evidence from the Datong pluton and its quenched enclaves in the western Kunlun orogen, northwest China

机译：俯冲沉积物衍生的弧状花岗岩：来自西北昆仑造山带的大同岩体及其淬火飞地的证据

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This paper presents detailed SHRIMP zircon U–Pb chronology, mineral chemistry, major and trace element, and Sr–Nd–Hf isotope geochemistry of the Datong pluton and its quenched enclaves from the western Kunlun orogen, northwest China, in an attempt to achieve a better understanding on the origin of diverse arc magmas. The Datong host granitoids are intermediate to acid in composition (SiO2 = 57.5 ~ 73.1 wt.%), and exhibit high-K calc-alkaline to shoshonitic affinities. The quenched enclaves are silica-rich ultrapotassic rocks. Detailed SHRIMP zircon U–Pb dating indicates that the Datong pluton was emplaced in Ordovician time (473.4–447.7 Ma), which places the Datong pluton in an active continental margin setting, rather than a syn-collision setting of Early Silurian age. The Datong host granitoids were derived by partial melting of subducted sediments, with the subsequent melt interacting with the overlying mantle wedge during its ascent. Partial melting of the veined mantle wedge hybridized by sediment-derived melts generated the silica-rich ultrapotassic magma, which was injected into the Datong granitoid magma chamber and quenched, resulting in enclaves hosted by granitoids. This contribution provides evidence that arc magmas can be derived directly by partial melting of subducted sediments, which is helpful to further understand the origin of diverse arc magmas.
机译：本文介绍了中国西北昆仑造山带大同岩体及其淬火飞地的SHRIMP锆石U-Pb年代，矿物化学，主要和微量元素以及Sr-Nd-Hf同位素地球化学，以期实现更好地了解各种弧形岩浆的起源。大同主体花岗素类在组成上居于酸性中间（SiO 2 = 57.5〜73.1 wt。％），并表现出高钾钙碱对肖肖尼特质的亲和力。淬火的飞地是富含二氧化硅的超钾盐岩。详细的SHRIMP锆石U–Pb测年表明，大同岩体是在奥陶纪时代（473.4–447.7 Ma）发生的，这使大同岩体处于活跃的大陆边缘环境，而不是志留纪早期的同碰撞环境。大同宿主花岗石是通过俯冲的沉积物的部分熔融而产生的，随后的熔融在上升过程中与上覆的地幔楔相互作用。脉状地幔楔的部分融化与沉积物衍生的熔体混合，产生了富含二氧化硅的超钾质岩浆，该岩浆被注入大同花岗岩类岩浆室并被淬灭，形成了由类花岗岩构成的飞地。这一贡献提供了证据，表明弧形岩浆可以通过俯冲沉积物的部分熔融直接获得，这有助于进一步了解各种弧形岩浆的成因。

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