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Hypogene kaolin deposits from felsic intrusive rocks (Peninsular Malaysia) with special reference to rare earth elements and stable isotopes geochemistry
Geosciences Journal ( IF 1.2 ) Pub Date : 2021-04-01 , DOI: 10.1007/s12303-021-0003-9
Hassan Baioumy , Mohsen Farahat , Mohd Hariri Arifin , Mohammad Noor Akmal Bin Anuar , Khaled Al-Kahtany

Clay fractions of the hypogene kaolin deposits from Ipoh granite and Jerai pegmatite are composed of kaolinite, while the greenish kaolin horizon of Ipoh area comprises of illite and kaolinite. Al2O3 and SiO2 are the main constituents in the studied kaolins with very low concentrations of other oxides. K2O occurs in relatively high contents in the illite-rich kaolin that formed by hydrothermal alteration of biotite-granite of the greenish kaolin horizon of Ipoh area. The higher contents of Ba, Cr, Cs, Ga, Rb, Sc, and Sn in the illite-rich horizon are inherited from its source rock. The relative enrichment of light rare earth elements (LREE) over heavy rare earth elements (HREE) as indicated from the high (La/Yb)n ratios and positive correlations between ΣREE and P2O5 in the studied kaolins suggest the occurrence of REE as authigenic florencite, churchite and/or rhabdophane and, therefore, reflect the kaolinitization process rather than the parent rocks. δH and δO values are similar in both Ipoh and Jerai kaolins with dH values range from −84 to −99‰ and positive δO values varying between 0.95 and 5.47%. H- and O-isotopes data fall close to the left side of the kaolinite line in equilibrium with meteoric water at temperatures of > 100 °C. The pronounced negative Eu anomalies, absence of positive Ce anomaly and high crystallization temperature (94–113 °C) indicate the hydrothermal (hypogene) origin of the studied kaolins as a result of the Triassic post-magmatic hydrothermal activities in Peninsular Malaysia. Mineralogical and geochemical variations among the studied deposits although they formed by the same kaolinitization process, suggest a significant role of parent rocks in their compositions.



中文翻译:

来自长英质侵入岩(马来西亚半岛)的次生高岭土矿床,特别涉及稀土元素和稳定同位素的地球化学

怡保花岗岩和Jerai伟晶岩的次生高岭土矿床的粘土级分由高岭石组成,怡保地区的绿色高岭土层由伊利石和高岭石组成。Al 2 O 3和SiO 2是所研究的高岭土中的主要成分,其他氧化物的浓度非常低。怡保地区绿色高岭土层中黑云母-花岗岩的水热蚀变形成的富含伊利石的高岭土中,K 2 O含量较高。富含伊利石的层中Ba,Cr,Cs,Ga,Rb,Sc和Sn的较高含量是从其源岩继承而来的。从高(La / Yb)n可以看出,轻稀土元素(LREE)相对于重稀土元素(HREE)的相对富集REE与P 2 O 5的比率和正相关在研究的高岭土中,稀土元素以自生絮凝剂,钙长石和/或菱闪石的形式出现,因此反映了高岭石化过程,而不是母岩。怡保和Jerai高岭土的δH和δO值相似,dH值在-84至-99‰之间,正δO值在0.95至5.47%之间变化。H和O同位素数据接近高岭石线的左侧,与温度> 100°C的流水平衡。明显的负Eu异常,不存在正Ce异常和高结晶温度(94–113°C)表明,由于马来西亚半岛三叠纪后岩浆热液活动,所研究的高岭土的热液(低基因)起源。

更新日期:2021-04-01
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