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首页> 外文期刊>Journal of Asian earth sciences >Comparison of characteristics and geochemical behaviors of REEs in two weathered granitic profiles generated from metamictized bedrocks in Western Peninsular Malaysia
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Comparison of characteristics and geochemical behaviors of REEs in two weathered granitic profiles generated from metamictized bedrocks in Western Peninsular Malaysia

机译：在西部半岛马来西亚中由Metamicated B基岩中产生的REES特征和地球化学行为的比较

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摘要

Rare earth elements (REEs), an important group of non-energy minerals, are vital to industrialized societies worldwide. Southeast Asian granitic belts are potential sources of ion-adsorption REE clays comprising large weathered granitic crusts that often have high-grade ion-adsorbed REEs. Characterization studies were conducted on representative samples from two sites, namely Lumut (LU) and Telok Murok (TM), located within the Malaysian Western granite belt. In both profiles, parent rocks were documented as medium-grained mica (phlogopite)-rich, S-type, peraluminous, ilmenite-series granite with metamict texture. Quartz, K-feldspar, and mica were major minerals, while REE-bearing accessory minerals were apatite, allanite, monazite, xenotime, and zircon. Al2O3 and LOI contents increased with depth in both weathered profiles, whereas P2O5 tended to be constant. Long-tube halloysite and kaolinite are abundant clays in the upper portions of the profiles, whereas the lower parts were rich in short-tube halloysite with smectite. Moreover, the depletion of REE + Y (REY) content in horizon A (B1) was clear, whereas REY was abundant in horizon B and/or C. The maximum content of REY could reach up to approximately 850 and 2350 ppm in horizon B2 and/or C in the LU and TM sites, respectively. Total REE content of the weathered crust was relatively elevated compared with that of the parent rocks (3-7 times) in the lower portions of both sites due to "high adsorption capacity" of abundant clay minerals in the deep profiles. Enrichment in LREE and HREE was indicated in the LU and TM sites, respectively. Trial leaching experiments with high-grade samples from both sites were conducted using ammonium sulfate. High recovery in the results proved REE adsorption by the clays in the lower parts of the profiles.
机译：稀土元素（REES）是一组重要的非能源矿物质，对全球工业化社会至关重要。东南亚花岗岩腰带是包含大型风化的花岗岩地壳的离子吸附REE粘土的潜在来源，其通常具有高级别离子吸附的REES。对位于马来西亚西部花岗岩皮带内的两个位点的代表性样本进行了表征研究，即Lumut（Lu）和Celok Murok（TM）。在这两个型材中，父母岩被记录为中晶云母（植物） - 粒子，S型，灭菌，钛铁矿系列花岗岩，具有代表质地。石英，K-Feldspar和云母是主要的矿物质，而携带戒指的附件矿物质是磷灰石，亚丙酸盐，单藏，Xenotime和锆石。 Al2O3和LOI含量随着风化型材的深度而增加，而P2O5往往是恒定的。长管哈利亚钛矿和高岭石是曲线上部的丰富粘土，而下部含有蒙脱石的短管霍氏石。此外，Ree + Y（Rey）含量在地平线A（B1）中的耗竭显然是透明的，而Rey在Horizo​​ n B和/或C中丰富。Rey的最大含量可以在Horizo​​ n B2中达到大约850％和2350ppm分别在LU和TM位点中的C和/或C.由于深型型材中丰富的粘土矿物质的“高吸附能力”，所以被风化的地壳的总重量含量相对升高，而父母岩石中的父岩（3-7次）相比。在LU和TM站点分别在LREE和HREE中进行丰富。使用硫酸铵进行来自两个位点的高级样品的试验浸出实验。结果高恢复证明了岩盘在曲线下部的粘土的吸附。

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