Sedimentology of acid saline lakes in southern Western Australia: Newly described processes and products of an extreme environment
Sedimentology of acid saline lakes in southern Western Australia: Newly described processes and products of an extreme environment
复制标题
DOI：
10.2110/jsr.2007.038
复制
发表时间：
2007-05-01
影响因子：
2
通讯作者：
Hong, Bo-Young
中科院分区：
文献类型：
--
作者：
Benison, Kathleen C.;Bowen, Brenda Beitler;Hong, Bo-Young
pH值在1.7至4之间的天然酸性盐水系统在西澳大利亚南部的Yilgarn地区很常见。物理和化学过程的结合在这里产生了一种以前没有描述过的现代沉积环境。洪水，蒸发浓缩，干燥，风成输送在表面，以及流入的酸性含盐地下水，强烈影响这些湖泊。岩盐、石膏、高岭石和氧化铁从酸性高盐湖水沃茨中沉淀出来。浅层酸性含盐地下水通过沉淀早期成岩岩盐、石膏、氧化铁、粘土、黄钾铁矾和明矾石影响湖泊和相关泥滩、砂滩、渠道和沙丘的沉积物。这些现代环境可能会产生一个岩石记录，主要由层状红色硅质岩和改造石膏砂组成，与不太常见的底部生长石膏和岩盐层交替，并通过酸性盐水沃茨的早期成岩特征进行蚀变。现代酸盐环境的沉积过程和产物的这份文件是对比较沉积学知识库的补充，也是对传统盐水分类模型的扩展。其意义包括更好地解释陆地红层和石化火星地层，改进酸修复方法，新的模型的形成和闭塞的孔隙，和新的设置为发现以前未描述的极端微生物。
Naturally acid saline systems with pH values between 1.7 and 4 are common on the Yilgarn Craton of southern Western Australia. A combination of physical and chemical processes here yield a previously undescribed type of modern sedimentary environment. Flooding, evapoconcentration, desiccation, and eolian transport at the surface, as well as influx of acid saline groundwaters, strongly influence these lakes. Halite, gypsum, kaolinite, and iron oxides precipitate from acid hypersaline lake waters. Shallow acid saline groundwaters affect the sediments of the lakes and associated mudflats, sandflats, channels, and dunes by precipitating early diagenetic halite, gypsum, iron oxides, clays, jarosite, and alunite. These modern environments would likely yield a rock record composed mostly of bedded red siliciclastic and reworked gypsum sand, alternating with less common beds of bottom-growth gypsum and halite, with alteration by early diagenctic features diagnostic of acid saline waters. This documentation of sedimentary processes and products of modern acid saline environments is an addition to the comparative sedimentology knowledge base and an expansion of the traditional models for classifying brines. Implications include better interpretations of terrestrial redbeds and lithified martian strata, improved acid remediation methods, new models for the formation and occlusion of pores, and the new setting for finding previously undescribed extremophiles.