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首页> 外文期刊>Journal of the Geological Society of India >Geothermal investigations in the Upper Vindhyan sedimentary rocks of Shivpuri area, central India
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Geothermal investigations in the Upper Vindhyan sedimentary rocks of Shivpuri area, central India

机译：印度中部Shivpuri地区上Vindhyan上沉积岩的地热研究

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Heat flow has been determined by combining temperature measurements in 7 boreholes with thermal conductivity measurements in the Upper Vindhyan sedimentary rocks of Shivpuri area, central India. The boreholes are distributed at 5 sites within an area of 15 × 10 km2; their depths range from 174 to 268 m. Geothermal gradients estimated from borehole temperature profiles vary from 8.0–12.7 mK m−1 in the sandstone-rich formations to 25.5–27.5 mK m−1 in the shale-rich formations, consistent with the contrast in thermal conductivities of the two rock types. Heat flow in the area ranges between 45 and 61 mW m−2, with a mean of 52±6 mW m−2. The heat flow values are similar to the 50 mW m−2 heat flow observed in other parts of the northern Indian shield. The heat flow determinations represent the steady-state heat flow because, the thermal transients associated with the initial rifting, convergence and sedimentation in the basin as well as the more recent Deccan volcanism that affected the region to the south of the basin would have decayed, and therefore, the heat flow is in equilibrium with the radiogenic heat production of the crust and the heat flow from the mantle. The present study reports the heat flow measurements from the western part of the Vindhyan basin and provides heat flow information for the Bundhelkhand craton for the first time. Radioelement (Th, U and K) abundances have been measured both in the sedimentary rocks exposed in the area as well as in the underlying basement granite-gneiss of Bundelkhand massif exposed in the adjacent area. Radioactive heat production, estimated from those abundances, indicate mean values of 0.3 μW m−3 for sandstone with inter-bands of shale and siltstone, 0.25 μW m−3 for sandstone with inter-bands siltstone, 0.6 μW m−3 for quartzose sandstone, and 2.7 μW m−3 for the basement granitoids. With a total sedimentary thickness not exceeding a few hundred metres in the area, the heat production of the sedimentary cover would be insignificant. The radioactive heat contribution from the basement granitoids in the upper crust is expected to be large, and together with the heat flow component from the mantle, would control the crustal thermal structure in the region.
机译：通过将印度中部Shivpuri地区Vindhyan上沉积岩中7个钻孔的温度测量值与导热率测量值结合起来，确定了热流。钻孔分布在15×10 km2 内的5个位置。其深度范围为174至268 m。根据井眼温度剖面估算的地热梯度从富砂岩地层的8.0-12.7 mK m-1 到富页岩地层的25.5-27.5 mK m-1 ，与两种岩石的热导率。该区域的热流范围为45至61 mW m-2 ，平均为52±6 mW m-2 。热流值类似于在印度北部盾构其他部分观测到的> 50 mW m−2 热流。热流的确定代表了稳态热流，因为与盆地中最初的裂谷，收敛和沉积以及影响盆地南部地区的最近的德肯火山活动相关的热瞬变会衰减，因此，热流与地壳的放射状产热和地幔的热流处于平衡状态。本研究报告了Vindhyan盆地西部的热流测量结果，并首次为Bundhelkhand克拉通提供了热流信息。在该区域暴露的沉积岩中以及在邻近区域暴露的Bundelkhand地块的地下基底花岗岩-片麻岩中都测量了放射性元素（Th，U和K）的丰度。从这些丰度估算的放射性热量产生值，表明页岩和粉砂岩带间带的砂岩的平均值为0.3μWm-3 ，带粉砂岩带间带的砂岩的平均值为0.25μWm-3 ，石英砂岩为0.6μWm-3 ，地下花岗岩为2.7μWm-3 。如果该地区的沉积物总厚度不超过几百米，那么沉积物覆盖层的热量产生将是微不足道的。预计上地壳中基底花岗岩的放射性热贡献很大，并且与地幔的热流成分一起将控制该地区的地壳热结构。

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