REE Geochemical Characteristics of Tungsten Minerals as a Discriminant Indicator of Genetic Types of Ore Deposits

【摘要】 <正> Tungsten minerals(scheelite and wolframite )from two genetic types ofgranitoids show significant dif-ferences in REE distribution,probably due to different material sources and origins.Tungsten miner-als in granite porphyry of the crust-mantle source are relatively high in ∑REE(1884ppm on average).∑ Ce is rich relative to ∑ Y and ∑ Ce/∑Y is relatively high(>1).The chondrite-normalizedREE distribution patterns are characterized by a group of rightward-inclined curves.Tungsten mineralsin 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-normalizedREE distribution patterns are characterized by a group of leftward-inclined curves.So the REEdistribution patterns can be used to discriminate the sources of rock-and ore-forming materials and thegenetic types of W deposits so as to provide clues to ore prospecting.更多还原

【Abstract】 Tungsten minerals(scheelite and wolframite )from two genetic types ofgranitoids show significant dif- ferences in REE distribution,probably due to different material sources and origins.Tungsten miner- als in granite porphyry of the crust-mantle source are relatively high in ∑REE(1884ppm 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.更多还原