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首页> 外文期刊>Contributions to Mineralogy and Petrology >Petrogenesis of the mafic igneous rocks of the Betic Cordilleras: A field, petrological and geochemical study
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Petrogenesis of the mafic igneous rocks of the Betic Cordilleras: A field, petrological and geochemical study

机译：Betic Cordilleras的镁铁质火成岩成岩作用：田间岩石学和地球化学研究

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Mafic igneous rocks are widespread in the Nevado-Filabride Complex, the lowermost metamor-phic unit of the internal zones of the Betic Cordilleras. They form intrusive, small, discontinuous bodies, predominantly dikes with subordinate small lava flows. The entire complex underwent alpine compressional metamorphism during the Paleogene continental collision, resulting in eclogites and bluesehists in the mafic bodies and high-pressure assemblages in the intruded metasediments. Locally, weakly metamorphosed or completely unmetamorphosed igneous rocks with the same textural features occur as patches surrounded by eclogitized igneous rocks. The bulk rock chemistry of unmetamor-phosed and completely metamorphosed mafic igneous rocks is consistent with an alkaline to transitional tholeutic magmatism with typical within-plate geochemical characteristics. All but a few samples are nepheline normative and display REE and trace element characteristics typical of continental, rift-related magmatism. This conclusion is strongly supported by the mineral chemistry of the major constituents, in particular the calcic Ti-rich character of clinopyroxene, the lack of orthopyroxene, and the occurrence of kaersutitic amphibole. Incompatible trace element abundances and Sr and Nd isotopes support the provenance of these magmas from a variably metasomatized previously depleted sub-continental lithospheric mantle source.
机译：镁铁质火成岩广泛分布于内华达－费拉布莱德综合体中，这是比蒂山脉山脉内部区域中最低的变质单元。它们形成侵入性的，小的，不连续的物体，主要是堤防以及次要的小熔岩流。整个复合体在古近纪大陆碰撞期间经历了高山压缩变质作用，导致镁铁质基岩中的榴辉岩和蓝岩岩以及侵入的变质沉积物中的高压组合。在局部，弱变形或完全未变形的具有相同质地特征的火成岩发生在被块化的火成岩包围的斑块中。未变质磷化和完全变质的镁铁质火成岩的块状岩石化学特征与具有典型板内地球化学特征的碱性至过渡变色质岩浆岩相一致。除少数样品外，其余所有样品均为霞石规范性样品，并显示出与陆相相关的岩浆作用典型的稀土元素和微量元素特征。该结论得到主要成分的矿物化学的强烈支持，特别是斜方晶石的钙富钛特征，邻方苯二酚的缺乏和喀尔松石闪石的出现。痕量元素的丰度和Sr和Nd同位素的不相容性支持了这些岩浆的来源，这些岩浆来自变质交代的先前枯竭的亚大陆岩石圈地幔源。

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