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首页> 外文期刊>Journal of geodynamics >Permian adakitic magmatism in the Khanui Group, Northern Mongolia - Late Paleozoic slab-melting of subducted oceanic plate beneath the 'Siberian continent'
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Permian adakitic magmatism in the Khanui Group, Northern Mongolia - Late Paleozoic slab-melting of subducted oceanic plate beneath the 'Siberian continent'

机译：蒙古北部哈努伊组的二叠纪岩浆岩浆作用-“西伯利亚大陆”下方俯冲洋板的古生代晚期板块熔融

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摘要

The Khanui Group, the Permian volcanic rock series of northern Mongolia, is a key geologic unit in the understanding of the Permian subduction-related magmatism at the southern margin of the "Siberian continent" (Siberian craton and accreted geologic units). Several studies have been carried out in the Khanui Group, but fundamental questions on its detailed petrogenesis remain to be answered. In this paper, the lithology, stratigraphy, zircon U-Pb age, and geochemistry of the Khanui Group in the Bulgan area of Mongolia, are described, and the Permian magmatism of the southern margin of the Siberian continent is discussed. The Khanui Group in this area is composed of intermediate lava and pyroclastic rocks. The zircons from this lava give a U-Pb age of 256.9 +/- 2.2 Ma, and are thus Late Permian. The lava is 53-61 wt.% SiO2, 17 wt.% Al2O3, low K2O/Na2O (avg. 0.4), high Sr/Y (avg. 97), high La/Yb (avg. 21), and comparatively high Mg# (avg. 43) which suggests that it is composed of adakites originating from subducted basaltic slab-melt. The lava is enriched in Cr and Ni compared with typical slab-melt, which likely to be the result of an interaction between the slab-melt and the overlying mantle peridotite. The Khanui rock thus confirms the existence of a basaltic slab beneath the Permian Siberian continent, and also the Late Paleozoic subduction of the Mongol-Okhotsk oceanic plate beneath the Siberian continent.
机译：Khanui集团是蒙古北部的二叠纪火山岩系列，是了解“西伯利亚大陆”南部边缘与二叠纪俯冲有关的岩浆作用的重要地质单元（西伯利亚克拉通和增生的地质单元）。卡努伊小组已经进行了几项研究，但有关其详细成岩作用的基本问题仍有待回答。本文介绍了蒙古布尔甘地区哈努伊群的岩性，地层，锆石U-Pb年龄和地球化学，并讨论了西伯利亚大陆南缘的二叠纪岩浆作用。该地区的Khanui组由中层熔岩和火山碎屑岩组成。来自该熔岩的锆石的U-Pb年龄为256.9 +/- 2.2 Ma，因此为二叠纪晚期。熔岩为53-61 wt。％SiO2、17 wt。％Al2O3，低K2O / Na2O（平均0.4），高Sr / Y（平均97），高La / Yb（平均21）和相对较高Mg＃（平均43）表明它是由俯冲玄武岩板状熔体中生成的Adakite组成的。与典型的板坯熔体相比，熔岩富含Cr和Ni，这可能是板坯熔体与上覆地幔橄榄岩之间相互作用的结果。因此，Khanui岩石证实了在二叠纪西伯利亚大陆之下存在玄武岩板，也证实了在西伯利亚大陆之下的蒙古-鄂霍次克大洋板块的晚古生代俯冲作用。

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