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Geochemical characteristics of basalts related to incipient oceanization: The example from the Alpine-Tethys OCTs

机译:初期洋化有关的玄武岩的地球化学特征:来自高山的例子 - Thethys Octs

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摘要

Basalts exposed in the Platta and Tasna nappes (SE Switzerland) derive from the Alpine-Tethys ocean-continent transitions (OCT) and overlie subcontinental lithospheric mantle (SCLM). We show that the trace element signatures of these basalts differ from mid-ocean ridge basalts (MORB). Two types of basalts occur in the OCT: a type-1 showing a 'garnet signature' that can be modelled by the partial melting of the SCLM in the spinel stability field and a type-2 characterized by an enrichment in incompatible elements that can be explained by the mixing between garnet-pyroxenite-derived melts and the melting of either a depleted MORB mantle or a refertilized SCLM. Based on the geological and geochemical observations, we propose that the basalts from the Alpine-Tethys OCTs result from a poly-phase magmatic system that carries an inherited SCLM signature. These basalts should therefore be referred to as OCT-basalts rather than as MOR-basalts.
机译:在Platta和Tasna Nappes(SE瑞士)暴露的碱基来自高山Threthys海洋大陆过渡(OCT)和覆盖了亚平坦的岩石树木地幔(SCLM)。 我们表明,这些基础的微量元素签名与中海岭沼气(Morb)不同。 OCT中发生两种类型的基础:1型式,显示了“石榴石特征”,其可以通过尖晶石稳定性场中SCLM的部分熔化来建模,其特征在于可以是不相容的元件中的富集 通过石榴石 - 辉曲岩衍生熔体之间的混合解释和耗尽的Morb壳体或引用的SCLM的熔化。 基于地质和地球化学观察,我们提出了来自高山Thethys OCT的沼气由携带遗传的SCLM签名的多相岩石系统产生。 因此,这些基础应被称为OCT-BASALTS而不是MOR-BASALTS。

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