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首页> 外文期刊>Bulletin of the National Research Centre >Stable Sulfur Isotopic Evidence on Environmental Conditions of Gypsum Deposits in Dir El-Baraqan Area, North Western Desert, Egypt
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Stable Sulfur Isotopic Evidence on Environmental Conditions of Gypsum Deposits in Dir El-Baraqan Area, North Western Desert, Egypt

机译：埃及西北沙漠Dir El-Baraqan地区石膏矿床环境条件的稳定硫同位素证据

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摘要

The gypsum deposits in Dir El-Baraqan area, NW Desert, were divided into three zones: biolaminated gypsum, disordered selenite and swallow-tail selenitic crystals. Microscopic examination revealed that biolaminated gypsum is characterized by regularly alternating dark and light laminas, which probably was formed due to the seasonal changes in Dir El-Baraqan area. Scanning electron microscopic (SEM) investigation, microprobe analysis and S-isotope composition were performed on gypsum samples. Stable sulfur isotope data showed that the gypsum deposits were characterized by δ~(34)S values ranging from +19.0 per thousand to +27.5 per thousand. In swallow-tail gypsum zones, the δ~(34)S values were chare -terized by a arrow range (from +19.0 per thousand to +20.2 per thousand which is considered as the primary phase in biolaminated zones, the δ~(34)S values exhibit variation between the white laminae (δ~(34)S = +23.55 per thousand and the dark la-mine (δ~(34)S +27.5 per thousand which is considered as the secondary phase. The high δ~(34)S values of dark laminae were attributed probably to the increasing activity of sulfate-reducing bacteria.
机译：西北沙漠Dir El-Baraqan地区的石膏矿床分为三个区域：生物层合石膏，无序亚硒酸盐和燕尾硒锌铁矿晶体。显微镜检查显示，生物层压石膏的特征是规则的暗层和浅层交替变化，这可能是由于迪尔-巴拉干地区的季节性变化而形成的。对石膏样品进行扫描电子显微镜（SEM）研究，微探针分析和S同位素组成。稳定的硫同位素数据表明，石膏矿床的δ〜（34）S值范围为+ 19.0 /千至+ 27.5 /千。在燕尾石膏区域，δ〜（34）S值的特征是箭头范围（从+ 19.0 /千到+ 20.2 /千，这被认为是生物层压区域的主要相，δ〜（34 ）S值在白色薄层（δ〜（34）S = + 23.55 /千和深色薄层矿（δ〜（34）S + 27.5 /千，被视为次生相）之间表现出差异。 （34）暗层的S值可能归因于硫酸盐还原菌活性的增加。

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