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首页> 外文期刊>Arabian journal of geosciences >Classification of the Neoproterozoic ophiolites of the Central Eastern Desert, Egypt based on field geological characteristics and mode of occurrence
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Classification of the Neoproterozoic ophiolites of the Central Eastern Desert, Egypt based on field geological characteristics and mode of occurrence

机译：基于现场地质特征的埃及中东沙漠中央东沙漠新思想眼镜的分类及发生

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摘要

The present work presents new field observations on the geological characteristics of the Neoproterozoic ophiolites of the Central Eastern Desert (CED) of Egypt. Based on mode of occurrences, the investigated ophiolites appear to show characteristics of both MORB-type and SSZ-type ophiolites and classified from oldest to youngest into: (1) MORB intact ophiolites (MIO), (2) dismembered ophiolites (DO), and (3) arc-associated ophiolites (AAO). Ophiolite components include serpentinized peridotite and other metamorphosed ultramafics, metagabbros, sheeted dykes, pillowed and massive metabasalts, minor boninites, and pelagic sediments. The rocks of the MIO and DO were subjected to two main phases of deformation (D-1 and D-2) and metamorphism, whereas the AAO have been affected only by later phase of deformation (D-2). Compositional variation of chrome spinel in blocks of metamorphosed ultramafic and serpentinite of dismembered ophiolites shows three distinct groups (G1, G2, and G3) based on their Cr#. Whereas G1 is similar to abyssal peridotites, G2 and G3 display mainly supra-subduction zone (SSZ) tectonic setting. The ophiolitic metagabbros display both N-MORB and supra-subduction zone tectonic setting (SSZ). The basaltic rocks of the MORB-intact ophiolites (MIO) and blocks of metabasalts in the m,langes display N-MORB affinity, whereas the basaltic rocks associated with arc volcanics display SSZ tectonic setting. Collectively, the investigated ophiolites of the Central Eastern Desert (CED) fall into two groups, MORB or BABB and SSZ ophiolites. They are spatially and temporally unrelated, and thus, it seems likely that the two types are not petrogenetically related. Ophiolites occur in different geological settings, and they represent change of the tectonic setting of the ophiolites from MORB to SSZ with time.
机译：本工作介绍了埃及中央东部沙漠（CED）的新典型杂交眼层的新现场观察。基于出现模式，所研究的眼硫酸盐似乎显示了Morb型和SSZ型眼镜菌素的特征，并从最古老的最古代中分为最小：（1）Morb完整的眼科（MIO），（2）被肢解的眼镜（DO）， （3）弧形关联的眼光（AAO）。 Ophiolite组分包括蛇形化的恒星和其他变质的超空间，Metagrabbros，片状染料，枕头和巨大的梅纳塞特，轻微的Boninites和脑皮沉积物。 MIO和确实的岩石经受了变形（D-1和D-2）和变质的两个主要相，而AAO仅受到后来的变形相的影响（D-2）。在多晶的超空白和蛇形素嵌段嵌段中的铬尖晶石的组成变化是基于其Cr＃的三个不同的基团（G1，G2和G3）。虽然G1类似于Abysal PeridoTites，G2和G3主要显示出Supra-俯冲区（SSZ）构造环境。 Ophiolitic Metagrabbros显示N-Morb和Supra-俯冲区构造（SSZ）。 Morb完整眼镜岩（MIO）的玄武岩岩（MIO）和M，Z轴显示N-MORB亲和力，而与电弧火山电弧显示的玄武岩岩石显示SSZ构造。集体，中东沙漠（CED）的调查过奥氏醇分为两组，Morb或Babb和SSZ Ophiolites。它们在空间上且时间不相关，因此，这两种类型似乎没有思科相关。 Ophiolites在不同的地质环境中发生，它们代表了随着时间的推移从Morb到SSZ的构造变化。

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