Porewater geochemistry data for sediment samples that were included in the global seep survey conducted via Alvin dives from R/V Atlantis cruise AT15-40 in the Guaymas Basin in 2008

<p>Porewater geochemistry of Guaymas Basin hydrothermal sediments (Southern Spreading segment, 27°00.44N and 111°24.55W, 2000 m water depth) including methane, CO2, and sulfate.&nbsp;</p>

<p>During two R/V Atlantis cruises to Guaymas Basin, the association of Beggiatoa mats with hydrothermal seepage and the habitat preferences of various Beggiatoa types were investigated by geochemical and microbiological characterization of sediments underneath Beggiatoa mats in combination with temperature measurements down to 40 cm sediment depth. In particular, temperature profiles and corresponding sulfide, sulfate, dissolved inorganic carbon (DIC), delta 13C-DIC, methane, and delta 13C-methane gradients from mats exhibiting orange-to-white color transitions were examined to elucidate hydrothermal fluid delivery and/or tolerance associated with differently colored Beggiatoa types&nbsp;(McKay et al. 2012)<br />
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瓜伊马斯盆地热液沉积物孔隙水地球化学数据集（南扩张段，北纬27°00.44′、西经111°24.55′，水深2000米），涵盖甲烷、二氧化碳（CO₂）及硫酸盐组分。

本数据集基于两次搭乘亚特兰蒂斯号科考船（R/V Atlantis）前往瓜伊马斯盆地的科考航次所获数据：研究人员通过对贝氏硫菌（Beggiatoa）菌席下方沉积物开展地球化学与微生物学表征，并结合沉积物0至40 cm深度的温度原位测量，探究了贝氏硫菌菌席与热液渗流的共生关系，以及不同类群贝氏硫菌的生境偏好。特别地，研究针对呈现橙至白色渐变的菌席，分析了其温度剖面及对应的硫化物、硫酸盐、溶解无机碳（dissolved inorganic carbon, DIC）、δ¹³C-DIC、甲烷、δ¹³C-甲烷的浓度梯度，以阐明热液流体补给特征，以及不同颜色类群贝氏硫菌对应的环境耐受能力（McKay等，2012）。