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Gold Science and Technology >

2019 , Vol. 27 >Issue 5: 659 - 677

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.05.659

Mineral Exploration and Resource Evaluation

Trace Elemental Compositions of Iron Oxides from the Lannitang Porphyry Cu-Au Deposit in the Zhongdian Region (Northwest) and the Geological Significances：A LA-ICP-MS Study

  • Jianheng GUO , 1, 2 ,
  • Chengbiao LENG , 1, 3 ,
  • Xingchun ZHANG 1 ,
  • Wei ZHANG 1 ,
  • Chongjun YIN 4 ,
  • Lujia ZHANG 4 ,
  • Zhendong TIAN 1, 2
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  • 1. State Key Laboratory of Ore Deposit Geochemistry，Institute of Geochemistry，Chinese Academy of Sciences，Guiyang 550081，Guizhou，China
  • 2. Chinese Academy of Science University，Beijing 100039，China
  • 3. State Key Laboratory of Nuclear Resources and Environment，East China University of Technology，Nanchang 330013，Jiangxi, China
  • 4. Yunnan Huaxi Mineral Resources Co. ，Ltd. ，Kunming 650200，Yunnan，China

Received date: 2019-06-28

  Revised date: 2019-08-03

  Online published: 2019-11-07

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Highlights

The Zhongdian area, located in northwestern Yunnan, is an important porphyry belt in China. It hosts a large number of Triassic intermediate-felsic porphyritic intrusions and porphyry deposits such as Pulang porphyry Cu-Au, Xuejiping porphyry Cu, Chundu porphyry Cu, Langdu Cu skarn and Lannitang porphyry Cu-Au deposit. The Lannitang porphyry Cu-Au deposit is located in west belt of the Zhongdian area. The magnetite in Lannitang porphyry Cu-Au deposit is widespread and it occurred as disseminated and vein types in potassic and chlorite-sericite alteration zone.Specularite is also observed frequently in the post-mineralization dolomite-quartz coarse veins.We conducted the petrography and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to determine the texture and composition of iron oxides (magnetite and specularite). In this study, we identified three types of magnetite. Type-Ⅰ magnetite is disseminated in potassic alteration of deposit. It is generally contains ilmenite lamellas. Type-Ⅱ and Type-Ⅲ magnetite are occurred in magnetite single vein and magnetite-bearing quartz stockwork vein separately. Type-Ⅱ and Type-Ⅲ are distributed in potassic and chlorite-sericite alteration zone. The LA-ICP-MS analyses show that Type-Ⅰ magnetite is relatively rich in V, Ni and Mg than other two types of magnetite. Type-Ⅱ and Type-Ⅲ magnetite are more enriched in Mn, Zn, Sn, Sc and high-Ni/Cr ratio than Type-Ⅰ magnetite.Type-Ⅱ and Type-Ⅲ magnetite has similar content of many trace elements. The concentration of Cr,Ga,Ni and Co in specularite is obviously lower than those of magnetite. The ilmenite lamellae and low-Ni/Cr(Ni/Cr<1) ratio revealed that Type-Ⅰ magnetite belongs to igneous magnetite. Type-Ⅱ and Type-Ⅲ are distributed in veinlets and displayed high-Ni/Cr ratio (Ni/Cr>1). We suggested that they are hydrothermal magnetite. Type-Ⅰ magnetite (igneous) is intergrown with hydrothermal minerals including chlorite and sericite and it has quiet similar contents of Ti, Al and Cr with the other two hydrothermal magnetite.We suggest that Type-Ⅰ magnetite (igneous) experienced late-stage fluid alteration, which induced the loss of Ti, Al and Cr.The similar content of trace element between Type-Ⅱ and Type-Ⅲ magnetite indicated that they may precipitate from same period of fluid.In combination with previous studies, we propose that the presence of elements such as Al, Mn, Mg and Sc are in solid solution within magnetite (and/or specularite),but the Ca, S, Cu, Ba, Sr and Zr may be present in micro-/nano-scale mineral inclusions.The widespread presence of magnetite-hematite and specularite in the potassic alteration zone and low Mn concentration of magnetite indicates a high oxygen fugacity of the Lannitang porphyry Cu-Au deposit (magnetite-hematite buffer).

Cite this article

Jianheng GUO , Chengbiao LENG , Xingchun ZHANG , Wei ZHANG , Chongjun YIN , Lujia ZHANG , Zhendong TIAN . Trace Elemental Compositions of Iron Oxides from the Lannitang Porphyry Cu-Au Deposit in the Zhongdian Region (Northwest) and the Geological Significances：A LA-ICP-MS Study[J]. Gold Science and Technology, 2019 , 27(5) : 659 -677 . DOI: 10.11872/j.issn.1005-2518.2019.05.659

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成文过程得到了中国地质科学院地球化学研究所陈伟研究员的指导，在此表示衷心感谢！

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