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首页> 外文期刊>Contributions to Mineralogy and Petrology >Petrology and petrogenesis of carbonatitic rocks in syenites from central Anatolia, Turkey
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Petrology and petrogenesis of carbonatitic rocks in syenites from central Anatolia, Turkey

机译：土耳其安那托利亚中部正长岩中碳酸盐岩的岩石学和岩石成因

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摘要

The late Cretaceous A-type Karacayir pluton in Central Anatolia, Turkey, intrudes and entrains xenoliths of Palaeozoic limestone. Carbonatitic magmatic rocks within the syenite have been previously interpreted (Schuiling in Nature, 192:1280, 1961) to result from metasomatic alteration and syntectic melting of marble. Carbonatites and associated calcite-syenites exhibit mineralogical characteristics (Ab-rich plagioclase, Ba-rich K-feldspar, low-Mg# biotite) that are petrogenetically more evolved than the host syenitic suite. Geochemically, carbonate-rich magmatic rocks are greatly enriched in Sr, Ba, Th, and REE and have higher LREE/HREE ratios than either syenites or marbles. In terms of O-C-Sr-Pb isotope ratios, the carbonatite/cal-cite-syenite suite form a consistent and geochemically coherent group that is distinct from the marble country rock and xenolith population, but similar to some of the syenitic, and particularly the nepheline syenite components of the Karacayir pluton.
机译：土耳其安那托利亚中部的晚白垩世A型Karacayir岩体侵入并夹带了古生界石灰岩的异岩。以前已经解释了正长岩内的碳酸盐岩浆岩（Schuiling in Nature，192：1280，1961），其原因是大理石的交代变质和共晶融化。碳酸盐岩和相关方解石-堇青石具有矿物学特征（富含Ab的斜长石，富含Ba的钾长石，低Mg＃黑云母），在成岩作用上比宿主的共生构造更为演化。从地球化学上讲，富含碳酸盐的岩浆岩中的Sr，Ba，Th和REE含量大大丰富，并且其LREE / HREE比值比正长岩或大理石更高。就OC-Sr-Pb同位素比率而言，碳酸盐岩/钙铝石-正长岩组形成了一个一致的，地球化学上连贯的族群，与大理石乡村的岩石和异种岩种群不同，但与某些蛇纹岩尤其是Karacayir岩心的霞石正长岩组分。

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