%0 Journal Article
%T Size Statistics of Plagioclase Phenocrysts in Mineralized and Barren Porphyries in Shaxi Porphyry Copper Gold Deposit, Anhui Province and Its Significance for Studying Magma Crystallization Kinetics and Ore Forming Process<br>安徽沙溪含和不含铜(金)矿斑岩斜长石斑晶粒度统计及其岩浆结晶动力学和成矿意义
%A Xu Wenyi
%A Fu Bin
%A Ren Qijiang
%A Hu Wenxuan
%A Xu Zhaowen
%A <br>徐文艺
%A 傅斌
%A 任启江
%A 胡文暄
%A 徐兆文
%J 岩石学报
%D 1997
%I 
%X Through size statistics of plagioclase phenocrysts in mineralized and barren porphyries in Shaxi porphyry copper gold deposit, the three parameters, i.e. average grain size ( S ),grain density ( D ) and homogeneity of distribution ( H ), have been calculated. On the basis of the crystal size distribution (CSD) theory, the growth rates, nucleation density and nucleation rates of plagioclase have been worked out. Comparing these parameters of mineralized porphyries with those of barren ones, we find that nucleation rates and nucleation density of mineralized porphyries are higher than those of barren ones, but crystal growth rates of mineralized porphyries are slower. This study shows that a slight difference of the characteristics of magma crystallization kinetics among the porphyries having similar petrochemical and geochemical composition, may result in obviously distinctive ore bearing potentiality.
%K Magma
%K crystallization kinetics
%K Average grain size
%K Grain density
%K Homogeneity of distribution
%K Crystal size distribution theory<br>岩浆结晶动力学
%K 平均矿物粒度
%K 矿物分布密度
%K 矿物分布均匀度
%K 晶体大小分布理论
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=D12D0421B94131CBE78B4A2C98514339&yid=5370399DC954B911&vid=FC0714F8D2EB605D&iid=0B39A22176CE99FB&journal_id=1000-0569&journal_name=岩石学报&referenced_num=1&reference_num=0