【摘要】 云南宝丰寺岩体地处扬子陆块西缘金沙江-红河断裂与程海-宾川断裂夹持部位,属于金沙江-红河富碱斑岩带组成部分,由细晶黑云母花岗斑岩（FCBGP）和粗晶花岗斑岩（CGGP）组成。通过对宝丰寺岩体开展的锆石Ti温度、锆石Ce⁴⁺/Ce³⁺值和δEu和δCe值研究结果表明:两类岩石锆石Ti温度相差不大（FCBGP为618.55℃—792.75℃,均值为692.42℃;CGGP为560.35℃～820.41℃,均值为714.13℃）,与S型花岗岩浆形成温度相似,反映宝丰寺岩体属S型花岗岩;锆石Ce⁴⁺/Ce³⁺值、δEu和δCe值总体较高(FCBGP的Ce⁴⁺/Ce³⁺值、δEu和δCe分别为24.51～1190.06、0.32～0.49和10.17～1231.19,均值分别为390.36、0.42和264.29;CGGP的Ce⁴⁺/Ce³⁺值、δEu和δCe分别为50.13～494.56、0.44～0.58和24.87～262.76,均值分别为232.98、0.49和141.82),与金沙江-红河富碱斑岩带含矿岩体特征值类似,表明宝丰寺岩体形成于高氧逸度环境,有利于岩浆体系中的成矿金属元素保留至岩浆分异演化的晚阶段,有利于形成斑岩型矿床。更多还原

【Abstract】 Located between Jinshajiang river-Red River and Binchuan-Chenghai faults in the west margin of Yangtze block,Baofengsi intrusion in Binchuan City,Yunnan province,China is an important part of Jinshajiang-Red River alkali-rich porphyry belt,it consists of fine crystal biotitic granite porphyry（FCBGP）and coarse-grain granite porphyry（CGGP）.The values of Ti temperature,Ce⁴⁺/Ce³⁺,δEu andδCe of zircons in Baofengsi intrusion are studied.The result shows that zircons Ti temperature of two types rock are almost the same（zircons Ti temperature of FCBGP are from 618.55℃to 792.75℃,and the average values are 692.42℃;Zircons Ti temperature of CGGP are from 560.35℃to 820.41℃,and the average values are 714.13℃）,and similar to the formation temperature of S type granite magma thus Baofengsi intrusion belong to S type granite.Generally,values of Ce⁴⁺/Ce³⁺,δEu andδCe of zircons from two types rock are higher(the Ce⁴⁺/Ce³⁺,δEu andδCe values of FCBGP are 24.51～1190.06,0.32～0.49 and 10.17～1231.19,respectively;the average Ce⁴⁺/Ce³⁺,δEu andδCe values of FCBGP are390.36,0.42 and 264.29,respectively.The Ce⁴⁺/Ce³⁺,δEu andδCe values of CGGP are 50.13～494.56,0.44～0.58 and 24.87～262.76,respectively;The average Ce⁴⁺/Ce³⁺,δEu andδCe values of CGGP are 232.98,0.49 and 141.82,respectively),similar to that of ore-bearing porphyry of JinshajiangRed River alkali-rich porphyry belt thus formed in a high oxygen fugacity environment,which is favorable for the preservation of ore-forming metal elements in the magmatic system to the late stage of magmatic differentiation and favorable for formation of porphyry ore deposit.更多还原