死海（约旦）里散半岛的重磁勘查

MAGNETIC AND GRAVITY INVESTIGATIONS OF THE LISAN PENINSULA OF DEAD SEA (JORDAN)

里散半岛位于非洲板块和阿拉伯板块支接处的死海盆地中。该盆地面积大，构造简单且有下沉运动，说明它是一位张型盆地。由重力异常数据发现死海盆地可划分成沿南北延伸各约３０ｋｍ长的几个块体，里散半岛是其一最深的一个。一生代沉积厚度约６ｋｍ，更新世沉积厚度为９ｋｍ。死海盆地的拉张距离为２０ｋｍ，表明死海盆地的年龄约３．３Ｍａ。里散半岛下部的前寒武纪结晶基底磁化率较高，这与区内延续的构造活动性有关。

The Lisan Peninsula is located within the Dead Sea Basin (DSB) which represents the plate boundary between African and Arabian plates.This basin constitutes a good example of a pull-apart basin because of its large dimensions,its structural simplicity.and its active subsidence. The gravity data revealed that the Dead Sea Basin can be divided into segments ,each of which is about 30 km long in N-S direction where the Lisan Peninsula represents the deepest on 9 km thickness of Pleistocene sediments)overlies about 6 km thickness of Mesozoic sediments.In addition,20 km of extension was predicted along the Dead Sea Basin , which indicated that the Dead Sea Basin should be≈3.3m. y. old.Furthermore,the precambrian basement under the Lisan area is characterized by high susceptibility contrast that is related to continues tectonic activity in the region.