Hydrocarbons in Icelandic volcanic-hydrothermal discharges: An inventory of concentrations and preliminary bulk carbon, radiocarbon and clumped isotopic data

冰岛火山热液排放中的碳氢化合物：浓度清单和初步散装碳、放射性碳和聚集同位素数据

• 批准号: 272754999
• 负责人: Professor Dr. Jens Fiebig
• 金额: --
• 依托单位: University of Iceland
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/272754999?language=en
• 关键词: Hydrocarbons; Icelandic; volcanic; hydrothermal; discharges

Several criteria have been proposed to be indicative for abiogenic hydrocarbon production in natural systems. Amongst these are i) carbon isotope distribution patterns between n-alkanes and ii) apparent attainment of equilibrium between CH4 and CO2. However, a more detailed knowledge about the parameters exerting control on the extent of C-isotope fractionation between CO2, CH4 and higher chain n-alkanes is necessary to more critically evaluate the suitability of these criteria as indicators of hydrocarbon origin. In several Mediterranean volcanic-hydrothermal systems, CH4 seems to be in equilibrium with CO2. All these investigated systems have in common that the associated hydrothermal reservoirs at depth occur more saline than seawater and that temperatures are always close to the critical point of the corresponding saline waters. We request funding to extend our work to volcanic-hydrothermal discharges on Iceland. The diversity of Icelandic volcanic-hydrothermal systems represents a unique opportunity to further explore hydrocarbon formation processes in volcanic environments. In contrast to the Mediterranean systems, many volcanic-hydrothermal reservoirs on Iceland i) host dilute meteoric waters, ii) exhibit temperatures well beyond the critical point of water and iii) are partially fed by gases deriving from the lower mantle. A comparison of chemical and isotopic data for Icelandic and Mediterranean discharges will improve our knowledge to what extent salinity, temperature and contributions from the lower mantle governs mass exchange between CO2 and CH4.Furthermore, we intend to acquire preliminary carbon isotope data on n-alkanes higher than methane, radiocarbon and clumped isotope (13C-D) data on methane to gain additional information on the origin of hydrocarbons in volcanic-hydrothermal systems. This study aims at improving existing sampling techniques so that bulk carbon isotope analysis on n-alkanes as well as radiocarbon and clumped isotope analysis on methane contained in Icelandic discharges becomes possible.

已经提出了一些标准来指示自然系统中非生物碳氢化合物的生产。其中包括 i) 正烷烃之间的碳同位素分布模式和 ii) CH4 和 CO2 之间明显达到的平衡。然而，有必要更详细地了解控制 CO2、CH4 和高链正烷烃之间 C 同位素分馏程度的参数，以更严格地评估这些标准作为烃源指标的适用性。在一些地中海火山热液系统中，CH4 似乎与 CO2 处于平衡状态。所有这些研究的系统都有一个共同点，即相关的深部热液储层的含盐量高于海水，并且温度始终接近相应咸水的临界点。我们请求资金将我们的工作扩展到冰岛的火山热液排放。冰岛火山热液系统的多样性为进一步探索火山环境中碳氢化合物的形成过程提供了独特的机会。与地中海系统相反，冰岛的许多火山热液储层 i) 含有稀释的大气水，ii) 的温度远远超过水的临界点，iii) 部分由来自下地幔的气体供给。冰岛和地中海排放物的化学和同位素数据的比较将提高我们对盐度、温度和下地幔的贡献在多大程度上控制二氧化碳和甲烷之间的质量交换的认识。此外，我们打算获取正烷烃的初步碳同位素数据高于甲烷、放射性碳和甲烷团块同位素 (13C-D) 数据，以获得有关火山热液系统中碳氢化合物起源的更多信息。这项研究旨在改进现有的采样技术，以便对冰岛排放物中的正烷烃进行大量碳同位素分析以及对甲烷中的放射性碳和团簇同位素分析成为可能。

项目成果

Isotope systematics of Icelandic thermal fluids

• DOI: 10.1016/j.jvolgeores.2017.02.006
• 发表时间: 2017-05
• 期刊: Journal of Volcanology and Geothermal Research
• 影响因子: 2.9
• 作者: A. Stefánsson;D. Hilton;A. Sveinbjörnsdóttir;P. Torssander;J. Heinemeier;J. Barnes;S. Ono;S. Halldórsson;J. Fiebig;S. Arnórsson

Geochemical constraints on volatile sources and subsurface conditions at Mount Martin, Mount Mageik, and Trident Volcanoes, Katmai Volcanic Cluster, Alaska

阿拉斯加卡特迈火山群马丁山、马吉克山和三叉戟火山挥发源和地下条件的地球化学限制

• DOI: 10.1016/j.jvolgeores.2017.09.001
• 发表时间: 2017
• 期刊: Journal of Volcanology and Geothermal Research
• 影响因子: 2.9
• 作者: Aiuppa;Fiebig;Capecchiacci;Giudice;Caliro;Tamburello
• 通讯作者: Tamburello

Abiogenesis not required to explain the origin of volcanic-hydrothermal hydrocarbons

• DOI: 10.7185/geochemlet.1920
• 发表时间: 2019-07-29
• 期刊: GEOCHEMICAL PERSPECTIVES LETTERS
• 影响因子: 4.9
• 作者: Fiebig, J.;Stefansson, A.;Mountain, B. W.
• 通讯作者: Mountain, B. W.

Abiotic Synthesis of Methane and Organic Compounds in Earth’s Lithosphere

地球岩石圈中甲烷和有机化合物的非生物合成

• DOI: 10.2138/gselements.16.1.25
• 发表时间: 2020
• 期刊: Elements
• 影响因子: 4.5
• 作者: Reeves;Fiebig
• 通讯作者: Fiebig

The hydrothermal system of the Domuyo volcanic complex (Argentina): A conceptual model based on new geochemical and isotopic evidences

多姆约火山群（阿根廷）的热液系统：基于新的地球化学和同位素证据的概念模型

• DOI: 10.1016/j.jvolgeores.2016.11.003
• 发表时间: 2016
• 期刊: Journal of Volcanology and Geothermal Research
• 影响因子: 2.9
• 作者: Liccioli;Agusto;Chiodini;Vaselli;Calabrese;Pecoraino;Tempesti;Caponi;Fiebig;Caliro;Caselli
• 通讯作者: Caselli