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Gold Science and Technology >

2023 , Vol. 31 >Issue 1: 15 - 25

DOI: https://doi.org/10.11872/j.issn.1005-2518.2023.01.043

Mineral Exploration and Resource Evaluation

Comparison of Geochemical Characteristics Between Yanshanian Ore-bearing Granites in Northwest Yunnan and Global Adakites

  • Zhenliang CAO , 1 ,
  • Xuelong LIU , 1 ,
  • Shoukui LI 1, 2 ,
  • Sihan LIU 1 ,
  • Fanglan LI 1 ,
  • Bowen ZHOU 1
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  • 1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
  • 2. Yunnan Institute of Geology and Mineral Resources Exploration, Kunming 650051, Yunnan, China

Received date: 2022-03-18

  Revised date: 2022-09-08

  Online published: 2023-03-27

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Highlights

Sanjiang area in southwest China is an important area for geological research.On the basis of previous studies，through collecting and collating the geochemical literature related to Yanshanian deposits in the Geza island arc，418 representative geochemical data of ore-bearing rock masses in the area were obtained，including Xiuwacu tungsten-molybdenum deposit，Tongchanggou molybdenum-copper deposit，Relin molybdenum-tungsten-copper deposit，Hongshan copper-molybdenum deposit and Hongniu copper-molybdenum deposit.Combined with computer big data，referring to previous research methods and according to the principle of data screening，the data with SiO2 content greater than 56% and less than 90%（granite SiO2>56%） were retained during screening.Excluding data with H2O and LOI content greater than 7% and CO2 content greater than 3%（high H2O and LOI content indicates strong alteration； high CO2 content indicates strong carbonation and calcitization）. Remove some samples with abnormally high content of main elements，such as samples with Fe2O3>30% and abnomally high MnO content.Remove the data with abnormally high trace elements（sample retention）.Draw the confidence ellipse and calculate the corresponding overlap rate.Meanwhile，the abnormal values in the study area（such as abnormal high values，abnormal low values，20 times higher than the average value of sample elements，etc.） were deleted during the study，the sample was retained and the negative value（which may exceed the detection limit） was deleted.The big data method was used to calculate the comparison values of different elements，and 65 536 maps were obtained by comparing with the global adakites.The study shows that the Yanshanian rock mass has the global adakite attribute，but also has its own characteristics.Some element ratios （the denominator contains Mo and Cu） are small and exceed the range of global adakite，which indicates that Mo and Cu elements dominate the Yanshanian rock mass in this area and the enrichment degree is good.In maps such as K2O/Mo-SiO2/Cu，Na2O/Cu-SiO2/Mo，MnO/Cu-SiO2/Cu，Na2O/Zn-SiO2/Mo，Mo and Cu fit well with most elements such as SiO2，TiO2，K2O and Na2O，and have the same trend of change，which indicates that the ore-bearing fluid and mineralization of Mo and Cu porphyry copper molybdenum ore are evolving continuously.The farther the Yanshanian granite data points related to ore-bearing deviate from the global adakite distribution range，the greater the escape degree.The Yanshanian ore-bearing rock mass in this area has a similar occurrence background to adakites.The application of relevant research on adakites in this area can further guide geological work.

Cite this article

Zhenliang CAO , Xuelong LIU , Shoukui LI , Sihan LIU , Fanglan LI , Bowen ZHOU . Comparison of Geochemical Characteristics Between Yanshanian Ore-bearing Granites in Northwest Yunnan and Global Adakites[J]. Gold Science and Technology, 2023 , 31(1) : 15 -25 . DOI: 10.11872/j.issn.1005-2518.2023.01.043

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