NUMERICAL MODELLING OF LITHOSPHERE EVOLUTION IN THE NORTH CHINA CRATON: THERMAL THINNING VERSUS TECTONIC EXTENSION THINNING  

作　　者：ZHANG Yan hua 1,2 , LIN Ge 2, WANG Yue jun 2 and FAN Wei ming 2 (1. CSIRO Exploration & Mining, P.O. Box 437, Nedlands, WA 6009, Australia 2. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013, China) 

出　　处：《Geotectonica et Metallogenia》2001年第1期72-74,共3页大地构造与成矿学（英文版）

基　　金：the CAS/CSIRO exchange program

摘　　要：The boundary between lithosphere and asthenosphere essentially represents a thermal boundary (the solidus). Temperature variation across this boundary can lead to the change of lithosphere thickness. In the case of elevated temperatures in a lithospheric layer above 1 200℃, partial melting will begin and the result of that is a thinned lithosphere. The other mechanism that can also thin lithosphere is extension. Stretching during an extension event can result in a thinner and longer lithosphere. The two mechanisms above are the reason why we can alserve large variations in lithosphere thickness spatially across various continents and temporally throughout the geological history.The boundary between lithosphere and asthenosphere essentially represents a thermal boundary (the solidus). Temperature variation across this boundary can lead to the change of lithosphere thickness. In the case of elevated temperatures in a lithospheric layer above 1 200℃, partial melting will begin and the result of that is a thinned lithosphere. The other mechanism that can also thin lithosphere is extension. Stretching during an extension event can result in a thinner and longer lithosphere. The two mechanisms above are the reason why we can alserve large variations in lithosphere thickness spatially across various continents and temporally throughout the geological history.

关 键 词：NUMERICAL MODELLING OF LITHOSPHERE EVOLUTION IN THE NORTH CHINA CRATON THERMAL THINNING VERSUS TECTONIC EXTENSION THINNING 

分 类 号：P5[天文地球—地质学]