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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Heat flow, deep temperatures and extensional structures in the Larderello Geothermal Field (Italy): constraints on geothermal fluid flow
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Heat flow, deep temperatures and extensional structures in the Larderello Geothermal Field (Italy): constraints on geothermal fluid flow

机译：拉德雷洛地热田（意大利）的热流，深部温度和伸展构造：对地热流体流的限制

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摘要

The Larderello geothermal field is located in the inner Northern Apennines (southern Tuscany), an area which has been affected by extensional tectonics since the Early-Middle Miocene. The structure of the Larderello field is characterised by NW-treriding, NE-dipping Pliocene to Present normal faults. Their geometry down to depths of 4-5 km is constrained by field, borehole, and reflection seismic data. An association between extensional structures and heat flow maxima (up to 1000 mW/m~2) is recognisable from detailed surface heat flow mapping. In order to investigate the relationships among extensional structures and heat flow, subsurface isotherms were traced, subject to borehole control, along variously oriented geological cross-sections. The isotherms show vertical displacements associated with the recent normal faults and related deformation zones, which reach the brittle/ductile transition. Estimates of the relative importance of convective and conductive components of heat flow suggest that fluid circulation is particularly important in correspondence with the normal faults, accounting for the correlation between isotherm perturbations and extensional structures. In this view, extensional shear zones are interpreted as the main structural pathways for the flow of hot geothermal fluids.
机译：拉德雷洛地热田位于北部亚平宁山脉（托斯卡纳南部），自中新世中期以来一直受到伸展构造的影响。 Larderello油田的构造以北西向，东北向上新世为正断层。野外，井眼和反射地震数据限制了其低至4-5 km深度的几何形状。从详细的表面热流图可以看出，伸展结构与热流最大值（高达1000 mW / m〜2）之间存在关联。为了研究伸展结构与热流之间的关系，沿井眼控制，沿不同方向的地质剖面追踪了地下等温线。等温线显示出与最近的正常断层和相关的变形带有关的垂直位移，这些位移达到了脆性/延性转变。对流热传导对流和传导分量的相对重要性的估计表明，与正常断层相对应的流体循环尤为重要，这说明了等温线摄动和伸展结构之间的相关性。按照这种观点，延伸剪切带被解释为热地热流体流动的主要结构路径。

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