论文部分内容阅读
念青唐古拉山前断裂系周围地区,包括雅鲁藏布江以北,纳木湖以南,麻江县以东,桑日县以西的整个地区。该区具有独特的地壳构造。本文用航磁异常计算出该地区居里等温面的深度。计算结果表明,在当雄——南木林断裂带(或称念青唐古拉山前大断裂)的西侧为居里等温面的隆起区。该区的居里等温面深度约16公里,地温梯度达40℃/公里以上,热流值达2.5HFU以上。可以认为,这是羊八井地区热田的深部热源。 由航磁异常可以同时推断出念青唐古拉山前断裂带的位置。此断裂带恰好通过居里等温面隆起区的东侧,成为深部热源上涌的通道。因此在此断裂带上,分布有该地区内主要的热田和沸泉,此带的地温梯度达100℃/公里。在此断裂带的西部边界有可能找到有意义的热田。
The area around the Nyainqentanglá fault system, including the area north of the Brahmaputra, south of Lake Nammu, east of Majiang County and west of Sangri County. The area has a unique crustal structure. In this paper, we calculated the depth of Curie’s isothermal surface in this area by using aeromagnetic anomaly. The calculated results show that the upwelling area of the Curie isothermal surface is located on the west side of the Damung-Nammulin fault zone (or the former Nyainqentanglha fault). Curie temperature range of about 16 km Curie temperature gradient of 40 ℃ / km above the heat flow value of 2.5HFU or more. It can be considered that this is a deep heat source in the thermal field in Yangbajing. From the aeromagnetic anomaly, the position of the Nyainqentanglha fault zone can be inferred at the same time. This fault just passes through the Curie isothermal surface uplift to the east and becomes a channel for deep heat source upwelling. Therefore, on this fault zone, the main hot fields and boiling springs in the area are distributed. The geothermal gradient of this zone reaches 100 ℃ / km. It is possible to find a meaningful hot field at the western boundary of this fault zone.