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首页> 外文期刊>Acta Geologica Sinica >The Gaojiacun Mafic-Ultramafic Complex (Sichuan, SW China): Neoproterozoic Magmatlc Activity at the Western Margin of the Yangtze Craton
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The Gaojiacun Mafic-Ultramafic Complex (Sichuan, SW China): Neoproterozoic Magmatlc Activity at the Western Margin of the Yangtze Craton

机译：高家村黑铁质-超镁铁质复合体（中国四川省四川省）：扬子克拉通西缘的新元古代岩浆活动

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The Neoproterozoic Gaojiacun Intrusive complex (GIC) is composed of one big Intrusion (ca. 9 X 7.5 km) and numerous satellite intrusions, emplaced in the low-grade schists of the Neoproterozoic Yanbian Group. The main intrusion is concentrically zoned, with peridotite bodies + leucogabbroids in its core (inner zone) and the sequence: olivine hornblende gabbronorite - porphyric pyroxene hornblende gabbronorite (transitional zone) - pyroxene hornblende gabbronorite + hornblende gabbro + diorite (outer zone), towards the margins. The satellite intrusions are composed either of a single rock type (peridotite, gabbro, diorite or granite) or of different rock types (peridotite + diorite + granite). Upper crustal contamination is evidenced by the occurrence of numerous metaniorphic enclaves, migmatltes and mixed rocks in the outer zone of the main intrusion and in the satellite intrusions. Hornblende (often oikocrystic) is present in all mafic and ultramafic rocks. Cu-Ni (-PGE) deposits occur in several satellite intrusions, hosted in peridotite. The geochemical and mineralogical features of GIC support the presence of a subduction zone at the western edge of the Yangtze Craton. A feeder-related genesis of the satellite intrusions is inferred.
机译：新元古代高家村侵入综合体（GIC）由一个大型侵入体（约9 X 7.5公里）和许多卫星侵入体组成，这些侵入体被置于新元古代延边组的低级片岩中。主要侵入体呈同心带状分布，在其岩心（内部带）中有橄榄岩体+隐花形藻，其顺序为：橄榄石角闪石辉长岩-斑状辉石角闪石辉闪石（过渡带）-辉石角闪石辉闪石带+向（+）闪闪石角闪石边距。卫星侵入体由单一岩石类型（橄榄岩，辉长岩，闪长岩或花岗岩）或不同岩石类型（橄榄岩+闪长岩+花岗岩）组成。在主要侵入体的外部区域和卫星侵入体中，出现了大量的亚变质飞地，突岩和混合岩石，证明了上地壳的污染。在所有镁铁质和超镁铁质岩石中都存在角闪石（通常为卵形岩）。 Cu-Ni（-PGE）沉积物存在于几个以橄榄岩为主体的卫星侵入体中。 GIC的地球化学和矿物学特征支持了扬子克拉通西缘的俯冲带。可以推断出卫星入侵的与馈线有关的起源。

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