福建东部地区大地电磁测深研究

1986年至1987年我们在福建东部做了深部大地电磁测深,取得以下主要结果: 1.福州、漳州两地区存在上地幔软流层的隆起（底辟）,岩石层变薄,并有次级底辟发育于20-30km深度,说明地幔热活动强烈,两地热田有深部热背景. 2.惠安至龙海一线大致呈北60°东为一低阻断面,该断面的地下电性结构和洋壳地电结构相似,推测该断面是向上仰冲的古洋壳与陆缘的缝合线. 3.永春、同安地区壳内高导层埋深明显比其它地区浅,是有希望的地热远景区,需进一步做工作.

MAGNETOTE LLURIC SOUNDING STUDIES IN THE EASTERN AREA OF FUJIAN PROVINCE

In 1986 and 1987 we have made low-frequency MTS in the eastern area of Fujian Province. The results are as following:1.An arising （i.e. diapiric structure） of asthenosphere was found in the upper mantle in both Fuzhou and Zhangzhou regions where lithosphere become thin and diapiric sub-structure exists at a depth of 20-30km. That means the geothermal activities are strong and hot springs connect with deep geothermal background thrre.2.There is a low-resistive zone with direction of N60°E from Huian to Longhai. Along the zone the geoelectrical structure is similar with that of the ocean crust. It is probably a suture of the old continent and the obducted oceanic crust.3.Two promising geothermal prospective areas were found in Yongchun and Tongan where the depths of highly conductive layers in the crust are obviously shallow. It is necessary to make more detailed investigation there.