Multi-kilometre long pathway of geofluids migration: Clues concerning an ophiolite serpentinization setting possibly responsible for the inferred abiotic provenance of methane in thermal water outflows of the South-West Carpathians (Romania)

Mitrofan Horia; Marin Constantin; Chitea Florina; Cadicheanu Nicoleta; Povara Ioan; Tudorache Alin; Ionita Daniela Elena; Anghelache Mirela-Adriana

首页> 外文期刊>Terra Nova >Multi-kilometre long pathway of geofluids migration: Clues concerning an ophiolite serpentinization setting possibly responsible for the inferred abiotic provenance of methane in thermal water outflows of the South-West Carpathians (Romania)

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Multi-kilometre long pathway of geofluids migration: Clues concerning an ophiolite serpentinization setting possibly responsible for the inferred abiotic provenance of methane in thermal water outflows of the South-West Carpathians (Romania)

机译：几公里的Geofloids迁移迁移：关于甲硫酸甲硅藻土化设置的线索可能负责西南喀尔巴阡山脉（罗马尼亚）的热水流出中的甲烷中的推断非生物出处

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Methane occurrences displaying signatures of a possible abiotic origin had previously been reported in the South-West Carpathians (Romania). Such an accumulation, at Tisovita, was intercepted by a well drilled in an ophiolitic rocks massif, whereas in two other localities-situated tens of kilometres faraway-the concerned methane is released via thermal groundwater outflows that are apparently not associated with any ultramafic products. By using groundwater ionic compositions, corroborated with previously published isotopic (C-13-CH4,H-2-CH4,He-3/He-4) and molecular gas analyses, we assessed in more detail the conjectured abiotic provenance of methane, and quantitatively investigated the hypothesis of a progressive mixing between two, abiotic and thermogenic, methane end-members. The corresponding geofluids behaviour was modelled by hypothesizing a "concealed" ophiolite serpentinization setting (largely similar to that at Tisovita), whose abiotic methane production was "diverted" towards remote discharges at ground surface, via a similar to 20-km-long flowpath supposedly generated by recently operating extensional tectonics.

机译：此前，在西南喀尔巴阡山脉（罗马尼亚）曾报道过显示可能非生物起源特征的甲烷出现。在Tisovita，这样的聚集被在蛇绿岩地块中钻探的一口井截获，而在数十公里之外的另外两个地方，相关甲烷通过热地下水流出释放，这些流出显然与任何超镁铁质产物无关。通过使用地下水离子组成，并与之前发表的同位素（C-13-CH4、H-2-CH4、He-3/He-4）和分子气体分析相证实，我们更详细地评估了推测的甲烷非生物来源，并定量研究了两个非生物和产热甲烷末端成员之间逐渐混合的假设。通过假设“隐伏”蛇绿岩蛇纹岩化环境（基本上类似于蒂索维塔的蛇纹岩化环境），模拟了相应的地质流体行为，其非生物甲烷生产通过一条类似于20 km长的流动路径“转向”地表远程排放，该流动路径据推测是由最近运行的伸展构造产生的。

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《Terra Nova》 |2021年第1期|共18页
作者
Mitrofan Horia; Marin Constantin; Chitea Florina; Cadicheanu Nicoleta; Povara Ioan; Tudorache Alin; Ionita Daniela Elena; Anghelache Mirela-Adriana;
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Romanian Acad Sabba Stefanescu Inst Geodynam Bucharest Romania;

Romanian Acad Emil Racovita Inst Speleol Bucharest Romania;

Romanian Acad Sabba Stefanescu Inst Geodynam Bucharest Romania;

Romanian Acad Sabba Stefanescu Inst Geodynam Bucharest Romania;

Romanian Acad Emil Racovita Inst Speleol Bucharest Romania;

Romanian Acad Emil Racovita Inst Speleol Bucharest Romania;

Univ Bucharest Fac Chem Dept Analyt Chem Bucharest Romania;

Romanian Acad Sabba Stefanescu Inst Geodynam Bucharest Romania;

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正文语种 eng
中图分类天文学、地球科学;
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Multi-kilometre long pathway of geofluids migration: Clues concerning an ophiolite serpentinization setting possibly responsible for the inferred abiotic provenance of methane in thermal water outflows of the South-West Carpathians (Romania)

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