Rit (Vísindafélag Íslendinga) - 01.06.1976, Side 138

Rit (Vísindafélag Íslendinga) - 01.06.1976, Side 138
15. 7.4 Biskupsíungur. The geothermal area Biskupstungur is located west of Hreppar and Skeið. This area includes many thermal springs discharging large amounts of water (samples No. 37-44). The sampling point Spóastaðir (No. 37), with 8D = — 65.1%0, has considerably higher 8D-values than the geothermal water col- lected from another quite closely located source, Spóastaðir (No. 38) , with 8d = — 78.6%0. Since the temperature and the Na+ and Cl“ content of the water with 8D = — 65.1%0 are also considerably lower than of the water with 8D = — 78.6%0 (see Table 11), it is believed that sample No. 37 has been mixed with cold ground- water of more or less local origin. The 8D-values of the other sources vary from — 71.6%0 to — 80.4%0. The three sources giving the lowest 8D-values are Sólheimar (No. 39) , Reykjavellir (No. 40) and Spóastaðir (No. 38), with 8D = — 80.4%0, 8D = — 78.0%o and 8D = — 78.6%0 respectively. All of these sources are located on a SW-NE line parallel to that in the previously discussed area Hreppar and Skeið. Assuming that the lowest 8D-values represent the 8D-value of the deep groundwater and that the water with higher 8D-values has been mixed with various amounts of more local groundwater, the re- charge area for the deep groundwater is likely to be the central part of Langjökull. 15. 7.5 BöðmóSsstaSir and SyÖri-Reykir. The two hot springs Syðri-Reykir (No. 45), with 8D = — 71.4%0, and Böðmóðsstaðir (No. 46), with 8D = — 74.0%o, are located still farther towards the west. The water at Syðri-Reykir was collected from a hot spring with a wide open surface. This water might therefore possibly have been somewhat enriched in deuterium due to evaporation from the open surface. We therefore believe that the samples collected at Böðmóðsstaðir are more representative for the deep circulating water in this district. According to this, the mean recharge area for the thermal water in this area should lie just south of the Langjökull glacier. 134
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Rit (Vísindafélag Íslendinga)

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