Waters from mud volcanoes of Azerbaijan: Isotopic-geochemical properties and generation environments
Waters from mud volcanoes of Azerbaijan: Isotopic-geochemical properties and generation environments
复制标题
阿塞拜疆泥火山的水：同位素地球化学性质和生成环境
DOI：
10.1134/s0024490215010034
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发表时间：
2015
影响因子：
0.8
通讯作者：
B. Polyak
中科院分区：
文献类型：
--
作者：
V. Lavrushin;I. Guliev;O. E. Kikvadze;A. Aliev;B. Pokrovsky;B. Polyak
关于阿塞拜疆35座泥火山沃茨化学和同位素性质的新数据表明，它们由两种截然不同的类型代表，其特点是不同的矿化作用：Cl-Na（M = 30-80 g/L）和HCO 3-Cl-Na（M = 30 -15 g/L）。最后一类沃茨通常富含碱金属、B和Br。Cl-Na型沃茨的Cl/Br系数与海水相似。根据Mg-Li和Na-Li地质温度计，沃茨的形成温度从120 ° C到140°C不等。考虑到这些估计数，所考虑的火山“根部”应位于6.0-7.5公里深处。流体生成温度表现出向大高加索造山带增长的趋势。溶解无机碳的δD、δ 18 O和δ 13 C（TDIC）值分别为−32至−12和−0.6至+10.4‰（V-SMOW）或−12.9至+37.3‰（V-PDB）。最高的δD、δ 18 O和δ 13 C值是典型的HCO 3-Na沃茨。结果表明，形成（Mg-Li）温度的增长伴随着δ 18 O（H2O）和δ 13 C（HCO 3 −）值沿着随HCO 3 −浓度的显著增加。Br、B和碱金属的水富集程度也增加。这使得泥火山苏打沃茨的形成具有较高的18 O和13 C含量，归因于相对较高的温度下的矿物和有机质的变化，在后生蚀变沉积岩。
New data on chemical and isotopic properties of waters from 35 mud volcanoes of Azerbaijan show that they are represented by two contrasting types characterized by different mineralization: Cl-Na (M = ∼30–80 g/L) and HCO3-Cl-Na (M = ∼8–15 g/L). Waters of the last type are usually enriched with alkaline metals, B, and Br. Waters of the Cl-Na type are similar in their Cl/Br coefficient with seawater. According to Mg-Li and Na-Li geothermometers, waters were formed at temperatures varying from ∼20 to ∼140°C. Taking into consideration these estimates, “roots” of the volcanoes under consideration should be located at depths of 6.0–7.5 km. The fluid generation temperatures exhibit a tendency for their growth toward the Greater Caucasus orogen. The δD, δ18O, and δ13C (TDIC) values in dissolved inorganic carbon vary from −32 to −12 and −0.6 to +10.4‰ (V-SMOW) or −12.9 to +37.3‰ (V-PDB), respectively. The highest δD, δ18O, and δ13C values are typical of HCO3-Na waters. It is shown that the growth of formation (Mg-Li) temperatures is accompanied by a significant increase of the δ18O(H2O) and δ13C(HCO3−) values along with HCO3−concentrations. The degree of water enrichment with Br, B, and alkaline metals also increases. This allows the formation of soda waters from mud volcanoes with elevated18O and13C contents to be attribute to relatively high-temperature transformations of mineral and organic matter during the catagenic alteration sedimentary rocks.