Mineral Chemistry of W-Bearing Rutile : An Indicator for Porphyry Mineralization in the Dabaoshan Mo Polymetallic Deposit, South China

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Authors

  • Youliang Xie
     School of Geosciences and Info-Physics, Central South University, Changsha 410083 ,CN
  • Yuzhou Feng
     Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640 ,CN
  • Jianping Liu
     School of Geosciences and Info-Physics, Central South University, Changsha 410083 ,CN
  • Haodi Zhou
     School of Geosciences and Info-Physics, Central South University, Changsha 410083 ,CN
  • Huajie Tan
     School of Geosciences and Info-Physics, Central South University, Changsha 410083 ,CN

Keywords:

W-Bearing Rutile, EPMA, Dabaoshan, South China.

Abstract

The Dabaoshan Mo-polymetallic deposit is located in the Nanling Metallogenic Belt, China. It consists of porphyry Mo, skarn Mo and strata”-bound Cu–Pb–Zn mineralization, of which rutile was only found in potassium feldspar alteration zones surrounding porphyry Mo orebodies. Petrographic observation combined with in–situ major elements mapping analysis by EPMA show that there are two generations of rutile, namely rutile I and rutile II. Rutile I with larger grain sizes(approximating to 100×200 μ m2) occur closer to the mineralization center of porphyry Mo orebodies than rutile II with smaller grain sizes(nearly 20×15 μ m2). Besides, rutile I grains are chemically zoned (in W and Cr), while rutile II are less likely to show chemically zoning. Rutile I grains have high W contents (4.79–9.57 wt%) and Cr contents (2.24–3.09wt%) in coherent zones. Slower diffusion rate on crystal face of W6+, which is the cation with the highest chemical valence and smallest radius, is an important factor accounting for chemical zoning in rutile I. Above all, the rutile in biotite and K–feldspar alteration zones surrounding porphyry Mo orebodies, especially those with large grian sizes,W-Cr anomaly and chemical zoning, are critical indicator of economic mineralization and mineralization center.

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Published

2022-10-22

How to Cite

Xie, Y., Feng, Y., Liu, J., Zhou, H., & Tan, H. (2022). Mineral Chemistry of W-Bearing Rutile : An Indicator for Porphyry Mineralization in the Dabaoshan Mo Polymetallic Deposit, South China. Journal of Mines, Metals and Fuels, 66(8), 518–525. Retrieved from http://www.informaticsjournals.com/index.php/jmmf/article/view/31752

Issue

Volume 66, Issue 8, August 2018

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Articles

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

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