EIFFERENCE BETWEEN TWO ISOSTATIC VRAVITY ANOMALY MAPS OF CHINA
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摘要: 地图出版社于１９８９年出版的《中国岩石圈动力学地图集》（国际岩石圈委员会１２５号出版物）中的全国“均衡重力异常”图，与地质出版社１９９６年出版的《中国地球物理图集》（国际岩石圈委员会２０１号出版物）中的全国“均衡重力异常图”的比较表明，在东经１０５°以西的大部分山区，如冈底斯山、昆仑山、阿尔金山、祁连山、巴颜喀拉山以及秦岭等处，两幅图件显示的均衡重力异常有较大的差异；不仅符号相反，而且数值相差达到１００或２００余毫伽．这个差异必然导致对同一个地区的两种截然不同的均衡状态估计．对于差异如此大的基础图件，有必要仔细核对，查明造成差异的原因。Abstract: Comparison of the 1°×1° Isostatic Gravity Anomaly Map of China in the Lithosphere Dynamics Atlas of China, International Lithosphere Committee PublicationNo. 125,with the Isostatic Gravity Anomaly Map of China in the Atlas of Geophysics of China, International Lithosphere Committee Publication No. 201 , shows that there are quite substantial differences between the two maps in most mountainous areas such asthe Gangdisssi Mountains, Kunlun Mountains, Aerjin Mountains, Qilian Mountains, Bayankala Mountains and Qinling Mountains in West China. The isostatic gravityanomalies in these areas are positive on the former map but negative on the latter one .The differences will lead to entirely different inference of the isostatic compensationfor the same area. The factors producing these differences should be investigated.
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Key words:
- Gravity /
- Isostaticanomalies /
- Isostaticcompensation.
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