Yanbo Cheng

Tin Deposits Associated with Rhyolitic Volcanic Rocks in Southeast China and Central-South America: Understandings and Prospects

Tin deposit is commonly associated with granite all over the world, such as the Sn ores in the Southeast Asia, South China, Western Australia, Erzgebirge, Galicia and Cornwall in Europe. The granite associated tin deposit has been the focus of numerous studies and is the major industrial type with huge economic significance. However, tin deposits are also associated with volcanic rocks which distribute in western Mexico, Bolivia, western America and the southeast of China (Cunningham et al., 1991; Huspeni et al., 1984).

Characteristics and Significance of Chlorite from Xinliaodong Cu Polymetallic Deposit in Wastern Guangdong Province, China

Eastern Guangdong Province is located in the intersection part of Nanling E-W tectonic-magmatic belt and the southeastern China N-E volcanic belt (Xu et al., 1999). The Xinliaodong is a newly-discovered copper ore deposit in eastern Guangdong Province, the genesis and type of which remains unclear until this moment. Chlorite is one of the main ore associated alteration minerals, which perhaps genetically related to copper mineralization in this ore district. Based on the field geological survey, microscopic observation and electron microprobe analysis, we systematically studied the category, elemental composition, forming temperature, forming environment and the formation mechanism of the chlorites with various occurrences from the Xinliaodong Cu polymetallic deposit. This paper tries to conduct preliminary studies on the relationship between chlorite and mineralization.