摘要
研究表明,斑岩型钨矿物和石英脉型钨矿物稀土组成是不同的,前者较富轻稀土,后者较富重稀土,它们与各自的含矿母岩稀土特征相类似。因此,稀土模式可以作为判别成岩成矿物质来源和划分矿床成因类型的标志,为找矿和矿床评价提供依据。
Tungsten minerals (scheelite and wolframite) from two genetic types of granitoids show significant differences in REE distribution, probably due to different material sources and origins. Tungsten minerals in granite porphyry of the crust-mantle source are relatively high in ∑REE (1884 ppm on average). ∑Ce is rich relative to ∑Y and ∑Ce/∑Y is relatively high (>1). The chondrite-normalized REE distribution patterns are characterized by a group of rightward-inclined curves. Tungsten minerals in quartz veins intruding the granites of crust origin have lower ∑REE (335 ppm on average).∑Y is rich relative to ∑Ce and ∑Ce/∑Y is relatively low (<1). The chondrite-normalized REE distribution patterns are characterized by a group of leftward-inclined curves. So the REE distribution patterns can be used to discriminate the sources of rock- and ore-forming materials and the genetic types of W deposits so as to provide clues to ore prospecting.
出处
《地球化学》
CAS
CSCD
北大核心
1990年第1期11-20,共10页
Geochimica
