电磁方法在海底多金属硫化物探测中的应用

海底硫化物矿体的三维展布是当前大洋调查急需解决的关键问题,在陆地上电磁方法一直是解决矿产资源三维问题的重要手段之一。2011年我国自主研发了调查海底多金属硫化物的瞬变电磁设备,并于2011年6月在中国大洋第22航次第5航段中的大西洋中脊“贝利珠”热液区( 13.2°S、14.4°W)进行了试验,取得了我国首批海底热液区的瞬变电磁资料。本文对这批资料进行初步分析,阐述一种新的海底硫化物探测方法及其试用结果,得到的视电阻率断面与热液区的实际有很好的对应关系,从2条测线的实测结果来看,设备的探测深度达到海底面以下50~100 m。在本次试用过程中,较好验证了自主研发的深海瞬变电磁设备、获得的数据以及探测深度的可靠性。

Application of electromagnetic methods in detection of seafloor polymetallic sulfides

Seafloor sulfide is an important undersea resource after the polymetallic nodules and the cobalt rich manganese crusts. China has made great achievements since starting sulfide investigation in 2005, but the most important problem how to deal with 3D structure of sulfide has been questioning us. On land, the electromagnetic methods have always been important for that. With the first independently developed TEM device, China has gained the first data for seafloor sulfide at South Atlantic Ridge(13.2°S,14.4°W) in June 2011 during cruise DY22 segment 5. The preliminary results correspond well with the actual hydrothermal vent area, and the detection depth reached 50~100 m below seabed, which verifies the reliability of the equipment.