Abstract:

 Based on tungsten and tin analytical data from stream sediments of 1∶200000 Regional GeochemistryNational Reconnaissance Project and the study of elemental abundance of crust and rocks in the eastern part of China, the temporal and spatial distribution characteristics of tungsten and tin in South China Continent (SCC) are discussed in this paper. On the temporal distribution, the high background contents of tungsten and tin in SCC are distributed in the South China Orogenic Belt and Coastal Volcanic Rocks Belt of Cathaysia Block, in the lower Yangtze Platformal Fold Belt and the Jiangnan Earth Axis of the Yangtze Block, in east of the YueyangHuaihuaGuilinWuzhouMaoming and south of Yangtze River. The concentrated distribution area of high contents of tungsten and tin in Nanling Region corresponds with important tungsten and tin orefield in China and the world as a whole, which occurred in the metallogenic domain of South China Mesozoic great granite province. On the lithology, alkalic feldspar granite and syenogranite, slate, phyllite and schist in basement in the southeast part of South China Block are characterized by high background contents of tungsten and tin. On the temporal distribution, the sandstones and mudstones in basement and cover from the Mesoproterozoic era are enriched in tungsten and tin; the extensive granitoid volcanicintrusive activities during the Indosinian and Yanshanian periods, in which the alkalic feldspar granite and syenogranite enriched in tungsten and tin played the main parts, reached a climax in the late stage of crustal evolution. These brought about the distribution of high background contents of tungsten and tin, and formed the geochemical domain. In addition, strong metallogenesis and a lot of middlelarge deposits of tungsten and tin widespread in the southeast part of SCC led to forming plentiful regional geochemical anomalies and local geochemical anomalies of tungsten and tin.

Key words: tungsten and tin, temporal and spatial distribution, Cathaysia Block, Yangtze Block, South China Continent