土耳其Erzin-Hatay活动断裂带热水同位素、水化学特征及其地热潜力

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Turkish Journal of Earth Sciences Pub Date : 2023-09-29 DOI:10.55730/1300-0985.1871
DİDEM YASİN, GALİP YÜCE
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引用次数: 0

摘要

对Erzin-Hatay地区的热水进行了地球化学调查,从天然泉水和一口井中收集了9个样品,其出口温度范围为19.6至31.5°C。所有的泉水都有微酸性的pH值(在6的范围内),但一个样品的pH值大于11,这是蛇纹石化过程的结果。水化学表明,在温度估计为58-162℃的平衡油藏中,水/岩石与岩浆岩或碳酸盐岩相互作用。收集水的稳定同位素组成(以dD和d18O表示)表明来自当地大气水的补给。溶解的气体表示没有大气成分的贡献。CO2是大部分样品的主要溶解成分,而甲烷是参与蛇纹石化的热水的主要成分。除主要组分CO2和CH4外,溶解气中He、H2和CO的浓度显著高于饱和水(ASW = 1.39 × 10-6)。氦同位素组成的3 He/4 He比值远高于饱和水(ASW = 1.39 × 10-6),表明地幔源的3 He贡献显著。考虑到Düziçiİskenderun活动断裂带附近一些采样点的位置和相关的地幔氦贡献,我们提出流体/断层关系必须考虑深部流体向浅层地下水的补给。由于幔源流体也是热能的载体,因此收集的结果强烈建议提高对研究区的认识,在考虑水文和地球化学因素以及该地区的构造背景的情况下,应将重点放在循环水的地热潜力上。
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Isotope and hydrochemical characteristics of thermal waters along the active fault zone (Erzin-Hatay/Turkey) and their geothermal potential
Geochemical investigations carried out on thermal waters over the Erzin-Hatay area allowed the collection of a suite of 9 samples from natural springs and one well characterized by outlet temperatures in the range from 19.6 to 31.5 °C. All of the springs have slightly acidic pH (in the range of 6) but one sample was marked by a pH value >11 as a consequence of serpentinization processes. The water chemistry denotes water/rock interactions with either magmatic or carbonatic rocks in a water reservoir equilibrated at temperatures estimated to be in the range of 58-162 °C. The stable isotope composition of the collected waters, in terms of dD and d18O, denotes a recharge from local meteoric waters. The dissolved gases denote the contribution of no atmospheric components. CO2 is the dominant dissolved component for most of the sample, while methane is the major component for the thermal water involved in serpentinization. Besides the main components CO2 and CH4 , the dissolved gases show significant concentrations of He, H2, and CO. The isotopic composition of helium shows 3 He/4 He ratios well above that of Air Saturated Waters (ASW = 1.39 × 10-6) clearly indicating a significant contribution of 3 He of mantle origin. Taking into account the location of some sampling sites nearby the Düziçiİskenderun Active Fault Zone and the associated mantle helium contribution, we propose that fluids/faults relationships have to be considered as responsible for the feeding of deep-originated fluids to the shallow groundwater. As mantle-derived fluids are also carriers of thermal energy, the collected results strongly suggest improving the knowledge of the study area, where hydrological and geochemical considerations coupled with the tectonic setting of the area should focus on the geothermal potential of the circulating waters.
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来源期刊
Turkish Journal of Earth Sciences
Turkish Journal of Earth Sciences 地学-地球科学综合
CiteScore
2.40
自引率
10.00%
发文量
6
审稿时长
6 months
期刊介绍: The Turkish Journal of Earth Sciences is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK). It is an international English-language journal for the publication of significant original recent research in a wide spectrum of topics in the earth sciences, such as geology, structural geology, tectonics, sedimentology, geochemistry, geochronology, paleontology, igneous and metamorphic petrology, mineralogy, biostratigraphy, geophysics, geomorphology, paleoecology and oceanography, and mineral deposits. Contribution is open to researchers of all nationalities.
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