Abstract

The article presents new geological, geochronological, mineralogical, geochemical, and isotopic data on the Early Cretaceous granitic rocks of the southern part of the Zhuravlevka Terrane (Sikhote-Alin). It is shown that four intrusive complexes containing significant amounts of granitic rocks were formed almost simultaneously in this area in the Early Cretaceous (about 100 Ma). These magmatic associations differ in rock set, their mineralogical characteristics, and chemical composition, varying from medium-potassium tonalites and granodiorites depleted in incompatible elements to shoshonitic monzonitic rocks enriched in HFSE and REE. The geochemical and isotopic characteristics of the granitic rocks indicate that the source of their melts was dominated by essentially juvenile metabasite crust with a limited contribution of the upper-crustal metasedimentary rocks. The diversity of geochemical types of the granitic rocks is explained by variable metabasite and metapelite contributions to their source, upper crustal contamination during magma ascent, as well as the variable contribution of the mantle source and different mechanisms of mantle–crust interaction.

中文翻译：

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Zhuravlevka地带南部（Sikhote-Alin）的早白垩纪花岗岩和Monzonitic岩石：地球化学组成和熔体来源

摘要

本文介绍了卓拉夫列夫卡地形（Sikhote-Alin）南部早期白垩纪花岗岩岩石的新地质，地质年代，矿物学，地球化学和同位素数据。结果表明，在白垩纪早期（约100 Ma）该区域几乎同时形成了4个含有大量花岗岩的侵入复合体。这些岩浆组合的岩石集，矿物学特征和化学成分各不相同，从贫化不相容元素的中钾盐辉石和花岗闪长岩到富集了HFSE和REE的滑铁质单晶岩。花岗岩岩石的地球化学和同位素特征表明，其熔体的来源主要是幼年的准贝母壳，而上壳变质沉积岩的贡献有限。花岗岩岩石的地球化学类型的多样性可以通过以下方式来解释：异位辉石和变质岩对其来源的贡献，岩浆上升期间上地壳的污染，地幔来源的贡献不一以及地幔-地壳相互作用的不同机制。