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LA-ICP-MS mineral chemistry of titanite and the geological implications for exploration of porphyry Cu deposits in the Jinshajiang – Red River alkaline igneous belt, SW China

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Abstract

The Jinshajiang–Red River alkaline igneous belt in the eastern Indian–Asian collision zone, of southwestern China, hosts abundant, economically important Cu–Mo–Au mineralization of Cenozoic age. Major- and trace-element compositions of titanites from representative Cu-mineralized intrusions determined by LA-ICP-MS show higher values for Fe2O3/Al2O3, ΣREE + Y, LREE/HREE, Ce/Ce*, (Ce/Ce*)/(Eu/Eu*), U, Th, Ta, Nb and Ga, and lower values for Al2O3, CaO, Eu/Eu*, Zr/Hf, Nb/Ta and Sr than those for titanites from barren intrusions. Different ΣREE + Y, LREE/HREE, U, Th, Ta and Nb values of titanites between Cu-mineralized and barren intrusions were controlled mainly by the coexisting melt compositions. However, different Sr concentrations and negative Eu anomalies of titanites between Cu-mineralized and barren intrusions were most probably caused by different degrees of crystallization of feldspar from melts. In addition, different Ga concentrations and positive Ce anomalies of titanites between Cu-mineralized and barren intrusions were most likely caused by different magmatic fO2 conditions. Pronounced compositional differences of titanites between Cu-mineralized and barren intrusions can provide a useful tool to help discriminate between ore-bearing and barren intrusions at an early stage of exploration, and, thus, have a potential application in exploration for porphyry Cu deposits in the Jinshajiang – Red River alkaline igneous belt, and to other areas.

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Acknowledgments

This research project is financially supported jointly by “the Key Natural Science Foundation of China (41130423), the 12th 5 Year Plan Project of State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences (SKLODG-ZY125-03), the Natural Science Foundation of China (41203041, 41473052), the CAS/SAFEA International Partnership Program for Creative Research Teams (Intraplate Mineralization Research Team, KZZD-EW-TZ-20), and the Natural Science Foundation of Guizhou Province ([2012]2335)”. Relevant staffs of Yunnan Honghe Henghao Mining Co. Ltd, Yunnan Copper Industry Co. Ltd and Tibet Yulong Copper Industry Co. Ltd. are gratefully acknowledged for their kind help during our fieldwork. Professor Zhaochu Hu (China University of Geociences, Wuhan, China) is thanked for his help in titanite LA-ICP-MS analyses. Professor Ian M Coulson (Regina University, Canada) and Dr. Xiaodong Deng (China University of Geociences, Wuhan, China) are acknowleged for their constructive advice. Associate Editor Leonid Danyushevsky and two anonymous referees are thanked for their constructive review, which significantly improved this paper.

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  1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China

    Leiluo Xu, Xianwu Bi, Ruizhong Hu, Yongyong Tang, Xinsong Wang & Yue Xu

  2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China

    Yongyong Tang, Xinsong Wang & Yue Xu

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  1. Leiluo Xu
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Correspondence to Xianwu Bi.

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Appendix A

LA-ICP-MS major-element results (wt.%) for titanite samples from Cu-mineralized and barren intrusions from the Jinshajing–Red River alkaline igneous belt

Appendix B

LA-ICP-MS trace-element results (ppm) for titanite samples from Cu-mineralized and barren intrusions from the Jinshajing–Red River alkaline igneous belt

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Xu, L., Bi, X., Hu, R. et al. LA-ICP-MS mineral chemistry of titanite and the geological implications for exploration of porphyry Cu deposits in the Jinshajiang – Red River alkaline igneous belt, SW China. Miner Petrol 109, 181–200 (2015). https://doi.org/10.1007/s00710-014-0359-x

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