Moscow University Geology Bulletin ( IF 0.3 ) Pub Date : 2022-04-24 , DOI: 10.3103/s0145875222020028 L. I. Demina 1 , V. S. Zakharov 1 , M. Yu. Promyslova 1
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Abstract
The geological position, morphology of serpentinite bodies, limitation of ophiolite occurrences by faults, fragments of host metamorphic rocks within the Stanovaya complex of ophiolites, the character of metamorphism, the high deformation of rocks of both ophiolites and sequences at the contact zone, and mineral parageneses of secondary transformations point to the introduction of the Stanovaya ophiolites into the deeply metamorphosed Faddey Block of the Northeastern Taimyr, rather than to their obduction. The results of modeling showed that fragments of the oceanic crust introduced into the metamorphosed complexes of the continental crust during the collision may have dual origins, that is, from the primary oceanic crust, and from the newly formed crust of the back-arc basin. A detailed analysis of the chemical composition of the Stanovsky ophiolites indicates that they were formed in the suprasubduction setting of a back-arc basin, which supports the possibility of the second scenario.
中文翻译：
基于地质资料和数值模拟的泰米尔东北部 Faddey 地块 Stanovaya 蛇绿岩介绍
摘要
蛇纹岩体的地质位置、形态、断层对蛇绿岩产状的限制、蛇绿岩 Stanovaya 杂岩中宿主变质岩的碎片、变质作用的特征、蛇绿岩和接触带的层序岩石的高变形以及矿物二次转化的共生现象表明 Stanovaya 蛇绿岩被引入泰米尔东北部深变质的 Faddey 地块，而不是它们的俯冲。建模结果表明，碰撞过程中引入陆壳变质杂岩的洋壳碎片可能具有双重起源，即来自原始洋壳和新形成的弧后盆地地壳。
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