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首页> 外文期刊>Journal of the Geological Society of India >Geochemistry of mid-ocean ridge mafic intrusives from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India
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Geochemistry of mid-ocean ridge mafic intrusives from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India

机译：印度东北部印度-缅甸造山带曼尼普尔蛇绿岩复合体的中洋脊镁铁质侵入体的地球化学

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摘要

Mafic intrusives emplaced within the mélange zone of the Manipur Ophiolitic Complex are subalkalinetholeiitic affinity with Fe-enrichment. Based on the field occurrences, textures-mineralogy and whole-rock compositions, these mafic intrusives can be identified as type-I (gabbro intrusives) and type-II (basalt-dolerite dykes). The type-I resembling enriched-type mid-ocean ridge basalt (E-MORB) shows moderate LREE enrichment (LaN/SmN = 2.5–2.6), slightly enriched MORB normalized HFSE patterns possibly represent melts derived from enriched MORB sub-oceanic mantle sources by small degree of partial melting. The other type-II has normal-type mid-ocean ridge basalt (N-MORB) geochemical features, as it exhibits nearly flat to depleted LREE (LaN/SmN = 1.0–0.6), flat MORB normalized HFSE patterns with slight LREE/HREE depletion (CeN/YbN = 1.37–0.46). It might have been derived from depleted MORB type sub-oceanic mantle source. The MORB signature displayed by these mafic intrusives indicates that they are dismembered fragments of oceanic crust generated at mid-ocean spreading ridge system and support the hypothesis that the Manipur ophiolites was initially formed in the divergent plate margin.
机译：位于Manipur蛇绿岩复合体混杂岩带中的黑铁质侵入体是富含铁的碱下脂环网亲和力。根据现场发生情况，质地矿物学和整块岩石成分，可以将这些镁铁质侵入体识别为I型（ga类侵入体）和II型（玄武岩-长石岩脉）。类似于富集型中洋脊玄武岩的I型显示中等程度的LREE富集（LaN / SmN = 2.5–2.6），略微富集的MORB归一化HFSE模式可能代表了衍生的熔体少量的部分融化作用从富集的MORB次洋幔源中提取。另一类II型具有正常类型的中洋脊玄武岩（N-MORB）地球化学特征，因为它表现出几乎平坦至耗尽的LREE（LaN / SmN = 1.0-0.6），平坦的MORB轻度LREE / HREE损耗（CeN / YbN = 1.37–0.46）的归一化HFSE模式。它可能源自MORB型枯竭的次洋幔源。这些铁镁质侵入体显示的MORB信号表明它们是在中洋扩张脊系统中产生的洋壳碎片，并支持了曼尼普尔蛇绿岩最初在发散板块边缘形成的假说。

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