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首页> 外文期刊>Geological Quarterly >Mineralogical, geochemical and stable isotope studies of kaolin deposits in north-west Gonabad district (eastern Iran)
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Mineralogical, geochemical and stable isotope studies of kaolin deposits in north-west Gonabad district (eastern Iran)

机译：西北赣达区高岭土矿床矿物学，地球化学，稳定同位素研究（东伊朗东部）

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摘要

Kaolin deposits, situated similar to 10 km north-west of Gonabad (eastern Iran), formed by the intrusion of hydrothermal fluids from a granite dyke in the western part of the study area, and the alteration of rhyolite, dacite and rhyodacite related to Eocene volcanism. There are four major kaolin quarries. The rocks in the investigated area are mainly slate, dacite, rhyolite, andesite-trachyandesite, and lithic and felsic tuffs. The mineralogical compositions of the kaolin deposits are dominated by quartz, kaolinite, dickite and illite with minor chlorite, montmorillonite, albite, hematite, pyrite and gypsum. Sanidine and plagioclase crystals in rhyolite-rhyodacite are sericitized and kaolinized. Whole rock chemistry of the kaolin deposits shows high contents of SiO2 and Al2O3. Enrichments of Sr in some samples demonstrate retention of Sr and depletion of Rb, Ba, Ca and K during hydrothermal alteration of sanidine and plagioclase within the volcanic units. The chondrite-normalized rare earth element patterns of the clay deposits show LREE enrichments (La/Lu)(on) = 6.75 to 57.74, pointing to kaolinization in low-pH waters. The isotope composition of the kaolin delta O-18 similar to+5%) is consistent with formation at isotopic equilibrium with water of hydrothermal/magmatic origin. The mineralogical composition; REE contents and elemental ratios in these deposits suggest provenance of the kaolin deposits mainly from felsic rocks and hydrothermal fluids. The O isotopic character also supports these results.
机译：位于贾巴德（伊朗东部）西北的高岭土矿床，由研究区西部的花岗岩堤坝的水热流体侵入，以及与eocene相关的流纹岩，牙科酸盐和籽沸石的改变火山主义。有四个主要的高岭土采石场。调查区域的岩石主要是Slate，Dacite，流纹岩，安德塞特 - 龟石和岩石和肠凝灰岩。高岭土沉积物的矿物学组合物由石英，高岭石，岩石和伊利钠为主，含有轻微的亚氯酸盐，蒙脱石，亚氨酸盐，赤铁矿，黄铁矿和石膏。血管岩 - rhoyodacite中的静嘌呤和普发基酶晶体是有殖腺化和高岭土的。高岭土沉积物的整体岩石化学显示出高含量的SiO2和Al2O3。一些样品中Sr的富集证明了在火山组中的静血法和Plagioclase的水热改变期间RB，Ba，Ca和K的Sr和耗尽。粘土沉积物的白细胞标准化稀土元素图案显示LREE富集（LA / LU）（ON）= 6.75至57.74，指向低pH水域中的高岭化。高岭土δO-18的同位素组成类似于+ 5％）与具有水热/岩浆源的水的同位素平衡的形成一致。矿物学组成;这些沉积物中的REE含量和元素比例提出了高岭土沉积物的出处，主要来自肠岩和水热流体。 O同位素特征也支持这些结果。

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