【作者】 刘宏兵； 孔详儒； 马晓冰； 王谦身； 闫永利； 闫雅芬； 杨志强；

【Author】 Liu Hongbing,Kong Xiangru,Ma Xiaobing,Wang Qianshen, Yan Yongli,Yan Yafen & Yang Zhiqiang Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100101,China

【机构】 中国科学院地质与地球物理研究所；

【摘要】 研究结果表明青藏高原各块体和断裂带的地壳深部物性特征有明显的差异,在横向和纵向具有明显的不均匀性。冈底斯块体尤为突出。由于受印度大陆的挤压,壳内高导层在冈底斯块体中向北倾,且不连续。但在羌塘和巴颜喀拉块体中基本上呈水平分布,且较厚。金沙江断裂带在玉树附近向北倾斜,澜沧江断裂和怒江断裂带基本上呈垂直分布。重力布格异常南北两端较高,高原内部较低,察隅-沙马尚未达到重力均衡,呈明显的负异常,表明该地区正处在快速隆升的阶段。此外在不同的块体内和断裂带上,地磁异常的变化十分明显,由南向北磁异常的强度和变化幅度明显的减弱。各种地球物理方法的观测与研究从不同的侧面反映出了研究区域内块体和断裂的空间展布特征。更多还原

【Abstract】 Research results show the obvious differences between the crustal deep physical features of each block and fault zone,and obvious inhomogeneity in longitudinal and horizontal directions.The Gandise block is especially outstanding.Squeezed by Indian Continent,the high conductive layer inclines northward,which is continuous in the Gandise block,but becomes horizontal in distribution and thick in Qiangtang and Bayan Har blocks.The Jinshajiang fault zone inclines northward near Yushu,while Lancangjiang and Nujiang fault zones present vertical distributions.Gravity Bouguer anomalies are high at the south and north edges and low in the center of the plateau.The Zayu-Shama region has not reached gravity equilibrium yet and represents obvious negative anomaly,which indicates that the region is in rapid uplift.Its geomagnetic anomaly varies evidently in different blocks and on different fault zones,and decreases obviously both in intensity and amplitude variations from south to north.The surveys and researches of various geophysical methods reflect the spatial distribution features of the blocks and faults in the surveyed area.更多还原