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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 Karaçayır 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/calcite-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 Karaçayır pluton. Other silicate magmatic rocks are geochemically, isotopically, and geochronologically different, suggesting the pluton is composite. Overall, the mineralogical and geochemical characteristics of the carbonatites are incompatible with binary mixing of syenite and marble but are consistent with derivation of carbonatite from petrogenetically evolved foid syenite. Carbonate–silicate rock types have modal variations compatible with an origin by fractional crystallisation, rather than by liquid immiscibility.
机译：土耳其安那托利亚中部的白垩纪晚期A型Karaçayır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），在岩石成因上比宿主的共生构造演化得更多。从地球化学上来说，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/方解石-正长岩组形成了一个一致的，在地球化学上连贯的群，这与大理石的乡村岩石和异种岩种群不同，但与某些正长岩，尤其是霞石正长岩相似Karaçayır子体的组件。其他硅酸盐岩浆岩在地球化学，同位素和地球年代学上是不同的，这表明岩体是复合的。总的来说，碳酸盐岩的矿物学和地球化学特征与正长岩和大理石的二元混合是不相容的，但与从成岩演化的辉石正长岩中衍生出的碳酸盐岩是一致的。碳酸盐-硅酸盐岩类型的模态变化与部分结晶兼容，而不是与液体不溶混。

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