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用磷灰石中稀土元素判别花岗岩成岩成矿系列 预览 被引量:25

USE OF REE IN APATITES TO DISTINGUISH THE PETROGENO-MINERALIZATION SERIES OF GRANITIC ROCKS
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摘要 REE investigatious of apatites from two series of granitic rocks, including more than ten types of rock and several tons of rack masses in eight south China's provinces permit us to have come to some new understanding abd hence the following conclusions have been drawn. Apatitos from different series of granitic rocks show significant differences in REE distribution, probably due to different source materials. Therefore, REE distribution characteristics can he used to distinguish source-different granitic rocks. The apatites in granites of the Nanling series (derived from the shallow erust) have a lower eontont of ∑REE (4571 ppm on everage). In the apatites Y is the highest of the REE group.∑Y is rich relative to ∑ Ce, thua giving rise to relatively low ∑ Ce/∑Y ratio (0.68 on average) Eu shows strong depletion, and..5 Eu is extremely law (0.135 on average).The REE distribution patterns are represented by the “V”-shaped symmetric curves.The apatites in granitos of the Changjiang (Yangtze) series are relatively high in ∑REE (8571.3 ppm on average) Ce is the highest of the REE group. ∑Ce is rich relative to ∑Y and the ∑Ce/∑Y is relatively high (7.15 an average) in the apatites from the Yangtze series. The chondrite-normalized REE distribution patterus are charactorized by the rightward-inclined curves. REE investigations of apatites from two series of granitic rocks, including more than ten types of rock and several tens of rock masses in eight south China's provinces permit us to have come to some new understanding and hence the following conclusions have been drawn.Apatites from different series of granitic rocks show significant differences in REE distribution, probably due to different source materials. Therefore, REE distribution characteristics can be used to distinguish source-different granitic rocks. The apatites in granites of the Nanling series (derived from the shallow crust) have a lower content of ∑REE (4571 ppm on average). In the apatites Y is the highest of the REE group. ∑Y is rich relative to ∑ Ce, thus giving rise to relatively low ∑ Ce/∑Y ratio (0.68 on average) Eu shows strong depletion, and 6 Eu is extremely low (0.135 on average). The REE distribution patterns are represented by the 'V'-shaped symmetric curves. The apatites in granites o'f the Changjiang (Yangtze) series are relatively high in ?REE (8571.3 ppm on average) Ce is the highest of the REE group. ∑Ce is rich relative to∑Y and the ∑Ce/∑Y is relatively high (7.15 on average) in the apatites from the Ya-ngtze series. The chondrite-normalized REE distribution patterns are characterized by the rightward-inclined curves.
作者 张绍立 王联魁 朱为方 杨文金 Zhang Shaoli Wang Liankui Zhu Weifang Yang Wenjin (Institute of Geochemistry, Academia Sinica)
出处 《地球化学》 CAS 1985年第1期 45-57,共13页 Geochimica
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