Abstract New thermal data for Fennoscandia have been recently acquired in two boreholes, Veiholmen and Raudsand 5, which are located in the northern part of More and Romsdal county of middle Norway. The calculated values of the uncorrected average heat flow density are 55 and 56 mW/m2 within the Veiholmen and Raudsand 5 boreholes, respectively. But, the values of average heat flow density, corrected for topography and palaeoclimate, are the following: 71 mW/m2 within the Veiholmen borehole and 79 mW/m2 within the Raudsand 5 borehole. The estimated palaeoclimatic corrections are relatively high and reach almost 20 mW/m2, showing the significance of taking into account the influence of the last glacial periods on the present-day thermal regime within the uppermost crust of Fennoscandia for geothermal calculations. The heat flow density is slightly higher in the Raudsand 5 borehole than in the Veiholmen borehole, most likely, due to the presence of the massive gneisses within the Raudsand area, which are characterized by higher radiogenic heat production compared to the diorites on the Innveien Island, where the Veiholmen borehole is located. The latter demonstrates the importance of internal heat production within the crust in addition to the heat coming from the Earth’s interior.

中文翻译：

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来自挪威中部 Veiholmen 和 Raudsand 钻孔的新热流数据

摘要 最近在位于挪威中部莫尔和罗姆斯达尔县北部的两个钻孔 Veiholmen 和 Raudsand 5 中获得了 Fennoscandia 的新热数据。Veiholmen 和 Raudsand 5 钻孔内未经校正的平均热流密度的计算值分别为 55 和 56 mW/m2。但是，根据地形和古气候校正后的平均热流密度值如下：Veiholmen 钻孔内为 71 mW/m2，Raudsand 5 钻孔内为 79 mW/m2。估计的古气候修正值相对较高，几乎达到 20 mW/m2，表明在地热计算中考虑末次冰期对 Fennoscandia 最上地壳内当今热状况的影响具有重要意义。Raudsand 5 钻孔中的热流密度略高于 Veiholmen 钻孔，这很可能是由于 Raudsand 区域内存在大量片麻岩，与因维恩岛上的闪长岩相比，这些片麻岩具有更高的放射热产生，Veiholmen 钻孔所在的位置。后者表明除了来自地球内部的热量外，地壳内产生内部热量的重要性。