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首页> 外文期刊>Bulletin de la Societe Geologique de France >Thermal anomalies and geological structures in the Provence basin: Implications for hydrothermal circulations at depth
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Thermal anomalies and geological structures in the Provence basin: Implications for hydrothermal circulations at depth

机译：普罗旺斯盆地的热异常和地质结构：对深部热液循环的影响

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摘要

Deep temperature estimates previously made in France show three main positive thermal anomalies, one of them being centred on the Provence basin (southeast France) between Marseille and Montpellier. This study presents newly corrected temperature data and improved temperature maps in order to (i) validate or to invalidate the thermal anomalies previously identified and (ii) relate deep temperatures with major geological structures of the area. Although the thermal gradient varies from place to place, it averages 31.3°C/km in the Provence basin (from 30.6 to 32.5°C/km in average for France according to the chosen database), but some locations show gradients reaching 36°C/km. To characterize thermal anomalous areas, a three-dimensional model of the temperatures was built between the surface and 6 km depth, allowing us to elaborate thermal maps and cross-sections. The identified thermal anomalies are different from those obtained by former works. New other "hot" anomalous areas (Montpellier, Lodève and Drome areas) and cold anomalous areas (Aix-en-Provence and Cévennes areas) have been highlighted. At depth, thermal cross-sections show 50 km-scale anomalies, which are parallel with the major faults (Cévennes, Nimes, Salon-Cavaillon and Moyenne-Durance faults) whereas more elongated (roughly 100 km) anomalies are associated with perpendicular cross-sections. On these cross-sections each major fault is associated with a thermal anomaly. In addition, a cold area may overlie a warm one, and vice versa. Among different possible explanations, these thermal signatures could correspond to convective fluid circulation within the faults. Simple numerical models of hydrothermal convection within fault zones appear to reproduce similar amplitudes and vertical variations of thermal anomalies as those observed in the Provence basin.
机译：先前在法国进行的深层温度估算显示出三个主要的正热异常，其中一个以马赛和蒙彼利埃之间的普罗旺斯盆地（法国东南部）为中心。这项研究提供了新校正的温度数据和改进的温度图，以（i）验证或使先前发现的热异常无效，以及（ii）将深部温度与该地区的主要地质结构联系起来。尽管各地的温度梯度有所不同，但普罗旺斯盆地的平均温度梯度为31.3°C / km（根据所选数据库，法国的平均温度梯度为30.6至32.5°C / km），但某些位置的温度梯度达到了36°C /公里。为了表征热异常区域，在地表和6 km深度之间建立了三维温度模型，这使我们能够详细描述热图和横截面。所识别的热异常不同于以前的工作。突出显示了其他新的“热”异常区（蒙彼利埃，洛代夫和德罗姆地区）和冷异常区（普罗旺斯地区艾克斯和塞文山脉）。在深处，热剖面显示50 km尺度的异常，与主要断层（塞文山脉，尼姆斯，Salon-Cavaillon和Moyenne-Durance断层）平行，而拉长的异常（约100 km）与垂直断层相关部分。在这些横截面上，每个主要故障都与热异常有关。此外，寒冷的地区可能覆盖温暖的地区，反之亦然。在不同的可能解释中，这些热特征可能对应于断层内的对流流体循环。断层带内热液对流的简单数值模型似乎再现了与普罗旺斯盆地相似的热异常幅度和垂直变化。

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