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首页> 外文期刊>THE CANADIAN MINERALOGIST >THE KURADAWE GRANITIC PEGMATITE FROM THE MAWAT OPHIOLITE, NORTHEASTERN IRAQ: ANATOMY, MINERALOGY, GEOCHEMISTRY, AND PETROGENESIS
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THE KURADAWE GRANITIC PEGMATITE FROM THE MAWAT OPHIOLITE, NORTHEASTERN IRAQ: ANATOMY, MINERALOGY, GEOCHEMISTRY, AND PETROGENESIS

机译：来自迈阿摩特的Kuradawe花岗岩Pegmatite，来自伊拉克东北部：解剖学，矿物学，地球化学和肝细胞

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The highly evolved Kuradawe granitic pegmatite dike is hosted in a harzburgite-dunite succession of the Mawat ophiolite in northeastern Iraq. It consists mainly of quartz, orthoclase, albite, tourmaline, and muscovite. Accessory minerals include cordierite, andalusite, monazite-(Ce), biotite, zircon, Nb-rich rutile, chlorapatite, chlorite, Sc-bearing columbite-(Fe), uraninite, U-rich thorite, and xenotime-(Y). The internal structure of the pegmatite consists of border, wall, intermediate, and core zones. Plagioclase composition increases from Ab(92) to Ab(97) towards the core. Whole rock major oxides such as MgO, Al2O3, and CaO decrease and SiO2 increases toward the core. Na2O, K2O, and total FeO are enriched in specific zones. Among the trace elements, incompatible elements such as Sr, Ba, and Zr decrease and the compatible elements Ni and Cr slightly increase toward the core. The pegmatite is characterized by the dominance of tourmaline; muscovite as the dominant mica; normative corundum; high contents of SiO2, Al2O3, A/CNK, and Rb; low contents of CaO and Sr; and a high total FeO/MgO ratio in biotite. These features suggest an affinity with calc-alkaline peraluminous S-type granite in a subduction-related, syncollisional setting. The pegmatite is classified as beryl-columbite subtype of the LCT family. The restricted occurrence of high-temperature cordierite in the border zone may suggest that the pegmatite was overprinted by modal metasomatism during intrusion into the mantle rocks. Zircon saturation geothermometry indicates inward crystallization at temperatures of 782 degrees C in the border zone, 717 degrees C in the wall zone, and 550 degrees C in the intermediate zones. Geochemical data suggest that inward crystallization typified the formation of the pegmatite.
机译：高度发展的Kuradawe花岗岩PEGMATITE堤防是在伊拉克东北部的麦芽葡萄牙乳头的Harzburgite-Dunite连续。它主要由石英，正交酶，阿尔巴顿，电气石和Muscovite组成。附件矿物质包括堇青石，安达卢西术，单济岩 - （Ce），Biotite，锆石，Nb富含金朗，氯磷灰石，亚氯，SC核心菌 - （Fe），铀酸盐，U型钍和Xenotime-（Y）。佩格麦特的内部结构包括边框，墙壁，中间和核心区。 Plagioclase组合物从AB（92）增加到核心AB（97）。整个岩石主要氧化物如MgO，Al 2 O 3和CaO减少，SiO2朝向核心增加。 Na2O，K2O和总FEO在特定区域中富集。在微量元素中，诸如Sr，Ba和Zr等不相容的元件，并且兼容元件Ni和Cr略微向核心增加。 Pegmatite的特点是助素的主导地位; Moscovite作为主导云母;规范刚玉; SiO2，Al2O3，A / CNK和RB的高含量;曹和Sr的含量低;和Biotite中的高总Fo / MgO比。这些特征表明与梯形相关的Syscolisional设置中的钙碱性衰减S型花岗岩具有亲和力。 Pegmatite被归类为LCT家族的Beryl-Columbite亚型。边界区中的高温堇青石的受限制发生可能表明在侵入地幔岩石中，佩格麦特石通过模态弥撒叠印。锆科饱和地热测定法表示边界区内782摄氏度的温度下的内部结晶，壁带中的717摄氏度，中间区域550℃。地球化学数据表明，内部结晶是指柚子的形成。

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