摘要
Abstract
As a rare gemstone resource, jadeite has seen a rapid rise in price in recent years, resulting in warming study on jadeite formation mechanism. This paper summarized geological features of the jadeite deposits in Burma, the major production area of gemstone-grade jadeite, introduced four theories on jadeite formation such as magmatic origin, meta-morphic origin, double-metasomatic origin and metasomatic origin, and thought it more scientifically reasonable that jadeite had been directly crystallized from silicate melt under high-T and high-P conditions. Based on its texture, inclu-sion, mineral assemblage and T-P conditions at formation, jadeitite was thought to have been formed from magma by crystallization at the lower pressure limit of P>1.5GPa and temperature range of 650 to 800℃. This paper discussed the source of the melt and argued that the silicate melt might have been related to diagenesis and metallogenesis of meta-morphic anatexis.关键词
硬玉/成矿理论/熔体/变质深熔/综述Key words
jadeite/metallogenic theory/melt/metamorphic anatexis/summarization分类
天文与地球科学
