【摘要】 <正> 天然界硫同位素比值的变异是解决硫化物矿床成因问题的一种有力的手段,但用来研究地热活动热补给源的工作并不多见。主要原因是,当今世界上处于开发状态的水热型地热田都处于近代或现代火山区,水热活动与地下岩浆活动具有直观和确切的时空关系。另外,有些学者认为,即使是深源硫,当它通过厚厚的沉积盖层上升到地表的过程中,也将会受到严重的混染,因而掩盖了原始硫的深源性质。另一些学者则证明:在某些特殊环境中,如果更多还原

【Abstract】 An attempt has been made to discuss the abyssal heat recharge of the high-temperature hydrothermal activities occurring within Xizang Plateau. 44 samples were examined, and for the purpose of comparison, 9 samples from Tengchong Volcano-Geother-mal Region in Western Yunnan Province and 2 samples of other volcanic sulfur were also examined. The samples of Xizang are mainly the natural sulfur originated from the high-temperature hydrothermal activities. Also a few samples of thenardite, tsch-ermigite, alunogen, epsomite, red opiment and metallic sulfides such as antimonite was determined. All samples were prepared under vacuum in the form of SO2, then isotopica,lly examined by mass-spectrometer CH4/58-Ⅳ. The measurements made clear that the δ34S of the sulfur flowers originated from Xizang’s high-temperature hydro-thermal areas are considerably close to CDT. The authors therefore postulate that the abyssal heat recharge for the high-temperature hydrothermal areas might exist. It is probably the magma pockets originated from intracrustal partial melting. The δ34S of salt incrustations from low-temperature hydrothermal areas are significantly different with CDT, but falls within the same variation range of δ34S of the salt minerals deposited from the salt lakes in Northern Xizang. This fact might imply the evolution trend of some hydrothermal activities into salt lake under circumstances such as those in Northern Xizang.更多还原