不同渗透率玄武岩母岩中玄武岩-堤侵入体接触带高温和低温蚀变过程的解卷积--对地热勘探的影响

IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Geothermics Pub Date : 2024-09-28 DOI:10.1016/j.geothermics.2024.103171
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引用次数: 0

摘要

岩浆侵入体是地热系统的重要热源,可促进质量传递、矿物转化和元素交换,从而形成接触金星。虽然这些过程在古代地质构造中的大型侵入复合体中得到了广泛研究,但对其在活动地热系统中发生的了解仍然有限。活火山系统中存在的极端条件往往掩盖了发生在主岩/侵入带中的地球化学过程。关于相对较小的堤状侵入体(厚度在 0.5 米以下)是否具有足够的热量来引起周围岩壁岩石的纹理或地球化学变化,以及这对未来勘探钻井项目的影响,仍然存在不确定性。本研究对两个不同的露头进行了分析,每个露头都有 50 厘米厚的玄武岩侵入体,分别位于高渗透性和低渗透性玄武岩母岩中。低渗透性母岩含有高温矿物相(>800 °C),如接触带的辉绿岩+辉长岩+富斜长石,我们认为这些矿物相是在部分熔融过程中形成的。在两个露头中,不移动、不相容的微量元素(如锆、铌和镭)保留了部分熔融的特征。我们证明,低度局部熔融(F ≈ 3-10%)会导致母岩成分从玄武岩转变为英安岩和/或闪长岩。热模拟表明,这些小型岩钉及其在接触区的部分熔体形成的时间很短(1 天),但却能使环境温度升高。这类事件在活跃地热系统的发展中起着重要作用。从理论上讲,这些小堤在地热钻探过程中不会构成重大风险,除非它们太小,在地球物理勘探过程中无法探测到。
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Deconvolution of high and low-temperature alteration processes along the contact zones of basaltic-dike intrusions in basaltic host rocks of different permeabilities – implications for geothermal exploration
Magmatic intrusions serve as crucial heat sources for geothermal systems, facilitating mass transfer, mineral transformations, and elemental exchange, which result in the formation of contact aureoles. While these processes have been extensively studied in large intrusive complexes in ancient geological formations, understanding of their occurrence in active geothermal systems remains limited. The extreme conditions present in active volcanic systems often obscure the geochemical processes occurring within host rock/intrusion zones. Uncertainties persist regarding whether relatively small dike intrusions (∼0.5 m thick) possess sufficient heat content to induce textural or geochemical changes in the surrounding wall rock, and what implications this may hold for future exploratory drilling projects. The analyses in this study were conducted on two distinct outcrops, each featuring 50-cm thick basaltic intrusions within both high- and low-permeability basaltic host rocks. The low permeability host rock hosts high-temperature mineral phases (>800 °C), such as sanidine + hedenbergite + albite-rich plagioclase in the contact zone, which we interpret to have formed during partial melting. Immobile, incompatible trace elements (such as Zr, Nb and La) retain the signatures of partial melting in both outcrops. We demonstrate that low degree partial melting (F ≈ 3–10 %) results in a compositional shift in the host rock from basalt to dacite and/or trachyandesite. Thermal modelling suggests that these small dikes, along with their partial melts in the contact zone, form over a very short period of time (< 1 day), but can elevate the ambient temperature. This type of events play an important role in the development of active geothermal systems. In theory, these small dikes do not pose a significant risk during geothermal drilling, unless they are too small to be detected during geophysical exploration.
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来源期刊
Geothermics
Geothermics 工程技术-地球科学综合
CiteScore
7.70
自引率
15.40%
发文量
237
审稿时长
4.5 months
期刊介绍: Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.
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