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首页> 外文期刊>Contributions to Mineralogy and Petrology >Early Cretaceous magmatism of Mount Hermon, Northern Israel
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Early Cretaceous magmatism of Mount Hermon, Northern Israel

机译：以色列北部赫尔蒙山的早白垩纪岩浆作用

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摘要

Early Cretaceous (146-115 Ma) magmatism in the region of Mt. Hermon, Northern Israel, is part of an extensive Mesozoic igneous province within the Levant associated with the evolution of the Neotethyan passive margin of Gondwana. The initial stages of activity were characterised by the emplacement of tholeiitic dykes (146-140 Ma) which were uplifted and eroded prior to the eruption of a sequence of alkali basalts, basanites and more differentiated alkaline lavas and pyroclastics from 127 to 120 Ma. The latest stages of activity (120-115 Ma) were highly explosive, resulting in the emplacement of diatreme breccias. Trace element and Sr-Nd-Pb isotope data for the most primitive Early Cretaceous mafic igneous rocks sam-pled suggest that they were derived by mixing of melts derived by variable degrees of partial melting of both garnet- and spinel-peridotite-facies mantle sources. Though isotopically heterogeneous, the source of the magmas has many similarities to that of HIMU oceanic island basalts. Earlier Liassic (200 Ma) transitional basalts and Neogene-Quaternary (15-0 Ma) alkali basalts erupted within northern Israel also have HIMU affinities. The petrogenesis of the Early Cretaceous and Cenozoic basalts is explained by partial melting of a lithospheric mantle protolith metasomatically enriched during the Liassic volcanic phase, which may be plume-related.
机译：白山早白垩世（146-115 Ma）岩浆活动。以色列北部的黑尔蒙（Hermon）是黎凡特地区广泛的中生代火成岩省的一部分，该省与冈瓦纳的新特提斯洋被动边缘演化有关。活动的初始阶段的特征是在127到120 Ma的一系列碱性玄武岩，玄武岩以及更具差异性的碱性熔岩和火山碎屑爆发之前，高隆起的堤坝（146-140 Ma）被冲蚀。活动的最新阶段（120-115 Ma）具有很高的爆炸性，导致安置角砾角砾。 sampled最原始的早白垩纪镁铁质火成岩的痕量元素和Sr-Nd-Pb同位素数据表明，它们是通过混合石榴石和尖晶石-橄榄岩-橄榄岩相地幔源部分熔融程度不同而得到的熔体混合而得到的。尽管同位素是异质的，但岩浆的来源与HIMU海洋岛玄武岩有许多相似之处。以色列北部爆发的较早的Liassic（200 Ma）过渡玄武岩和新近纪-第四纪（15-0 Ma）碱性玄武岩也具有HIMU亲和力。早白垩世和新生代玄武岩的成岩作用是由在火山岩相中变质富集的岩石圈地幔原生岩的部分熔融解释的，这可能与羽流有关。

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