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首页> 外文期刊>Acta Geologica Sinica >Association of Late Paleozoic Adakitic Rocks and Shoshonitic Volcanic Rocks in the Western Tianshan, China
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Association of Late Paleozoic Adakitic Rocks and Shoshonitic Volcanic Rocks in the Western Tianshan, China

机译：中国西部天山晚古生代埃达克质岩石和火山岩火山岩协会

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摘要

The late Paleozoic adakitic rocks are closely associated with the shoshonitic volcanic rocks in the western Tianshan Mountains, China, both spatially and temporally. The magmatic rocks were formed during the period from the middle to the late Permian with isotopic ages of 248-268 Ma. The ~(87)Sr/~(86)Sr initial ratios of the rocks are low in a narrow variation range (～0.7050). The ~(143)Nd/~(144)Nd initial ratios are high (～0.51240) with positive ε_(Nd)(t) values (+1.28-+4.92). In the ε_(Nd)(t)-(~(87)Sr/~(86)Sr)_i diagram they fall in the first quadrant. The association of the shoshonitic and adakitic rocks can be interpreted by a two-stage model: the shoshonitic volcanic rocks were formed through long-term fractional crystallization of underplated basaltic magma, while the following partial melting of the residual phases formed the adakitic rocks.
机译：在空间和时间上，晚古生代埃达克质岩石与中国天山西部的火山岩火山岩密切相关。岩浆岩形成于二叠纪中期至晚期，同位素年龄为248-268Ma。岩石的〜（87）Sr /〜（86）Sr初始比率在狭窄的变化范围内（〜0.7050）较低。 〜（143）Nd /〜（144）Nd初始比率高（〜0.51240），正ε_（Nd）（t）值为（+ 1.28- + 4.92）。在ε_（Nd）（t）-（〜（87）Sr /〜（86）Sr）_i图中，它们位于第一象限中。火山岩和火山岩的结合可以通过两阶段模型来解释：火山岩是通过底层玄武岩浆的长期分步结晶形成的，而残余相的随后部分熔融形成了火山岩。

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