| 徐恒,崔银亮,周家喜,荣惠锋,姜永果.云南宝丰寺岩体锆石微量元素特征及地质意义[J].地质找矿论丛,2019,34(1):132-139 |
| 云南宝丰寺岩体锆石微量元素特征及地质意义 |
| Trace element characteristics of zircon from Baofengsi intrusion in Yunnan and the geological implication |
| 投稿时间：2017-10-31 |
| DOI：10.6053/j.issn.1001-1412.2019.01.017 |
| 中文关键词: 锆石Ti温度 岩浆氧逸度 锆石微量元素 宝丰寺岩体 云南省 |
| 英文关键词:zircons Ti temperature magmatic oxygen fugacity zircon trace element Baofengsi intrusion Yunnan province |
| 基金项目:中国地质调查局项目（编号：1212011120607）、云南省有色地质局项目（编号：20131300001）联合资助。 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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 and δCe 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 and δCe of zircons from two types rock are higher (the Ce4+/Ce3+, δEu and δCe values of FCBGP are 24.51~1190.06, 0.32~0.49 and 10.17~1231.19, respectively; the average Ce4+/Ce3+, δEu and δCe values of FCBGP are 390.36, 0.42 and 264.29, respectively. The Ce4+/Ce3+, δEu and δCe values of CGGP are 50.13~494.56, 0.44~0.58 and 24.87~262.76, respectively; The average Ce4+/Ce3+, δEu and δCe values of CGGP are 232.98, 0.49 and 141.82, respectively), similar to that of ore-bearing porphyry of Jinshajiang-Red 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. |
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