泥盆地球化学揭示地下地质活动

IF 2.9 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Georgia R. Dahlquist Selking, Paul Helfrich, Jacqueline Timmer and Alysia Cox*, 
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引用次数: 0

摘要

现今的泥盆地球化学提供了对大陆热液系统过去地下活动和过程的一瞥。综合的流纹岩泥盆的地球化学、矿物学和微生物采样,特别是在一个地区的化学不同的分区,仍然很少。我们研究了黄石国家公园8个热区的15个泥坑的地球化学参数,并将其与附近pH值和温度相似的温泉进行了比较,以识别泥坑特征。水相微量元素相对丰度和沉积物矿物学分析表明,黏度约为5 ~ 100 cP (mPa·s)的泥盆中含有与下伏岩石单元相联系的微量元素地球化学“指纹”。地下热液分馏的变化可以反映在热区地表温泉δD、pH和总溶解氯的关系上。与其他热特征相比,富含粘土的泥盆中含水硼的含量异常低,这使得硼不像以前认为的那样是泥盆中水岩相互作用的可靠代表。相似pH值和温度的浑浊温泉和泥塘缺乏一致的化学相似性,但泥塘与共享热源水的温泉表现出主要的阴离子和阳离子相似性,这是由溶解氯和δD决定的。泥塘生境的微生物群落以少数门为主,在物种水平上具有巨大的多样性,并且具有产甲烷、氮循环和异养能力。泥盆是由酸性蒸汽改变火山岩形成的,可以作为潜在地质的指示物,也可以作为古代栖息地的现代类似物,提供地球化学和微生物的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mudpot Geochemistry Reveals Subsurface Geologic Activity

Mudpot Geochemistry Reveals Subsurface Geologic Activity

Mudpot Geochemistry Reveals Subsurface Geologic Activity

Present day mudpot geochemistry provides a glimpse of past subsurface activity and processes in continental hydrothermal systems. Integrated geochemical, mineralogical, and microbiological sampling of rhyolite hosted mudpots, particularly in chemically distinct subregions of an area, has remained scarce. We examined and compared geochemical parameters in 15 mudpots at eight thermal areas in Yellowstone National Park to nearby hot springs of similar pH and temperature to discern identifying mudpot characteristics. Aqueous trace element relative abundances and sediment collected for mineralogical analysis revealed that mudpots with approximate viscosities of 5–100 cP (mPa·s) contained trace element geochemical “fingerprints” linked with underlying rock units. Alterations in subsurface hydrothermal fluid fractionation can be reflected in relationships between δD, pH, and total dissolved chloride in surficial hot springs in a thermal area. The clay-rich mudpots contained uncharacteristically low aqueous boron compared to other thermal features making boron a less reliable proxy for water–rock interaction in mudpots than previously thought. Turbid hot springs and mudpots of similar pH and temperature lacked consistent chemical similarity, however, mudpots exhibited major anion and cation similarity to hot springs from shared thermal source waters, as determined by dissolved chloride and δD. Mudpot habitats hosted microbial communities dominated by a few phyla with immense diversity at the species level and methanogenesis, nitrogen cycling, and heterotrophic capabilities. Mudpots, formed by acidic steam altering volcanic rock, serve as indicators of underlying geology that may also provide geochemical and microbial insight as modern analogs to ancient habitats.

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来源期刊
ACS Earth and Space Chemistry
ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology
CiteScore
5.30
自引率
11.80%
发文量
249
期刊介绍: The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.
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