碳酸盐矿物阴极发光影响因素研究OA

[Objective]The cathodoluminescence(CL)characteristics of carbonate minerals are closely related to their major/trace and rare earth element(REE)contents.Existing studies primarily focus on the effects of Mn and Fe on CL,often neglecting the role of REEs.This study aims to investigate the influence of major/trace and rare earth el-ements on the CL characteristics of carbonate minerals,thereby providing geological evidence for inferring mineral genesis,depositional environments,and diagenetic processes.[Methods]CL and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)were used to test carbonate rock samples from the Lower and Middle Ordovi-cian on the southern margin of the Ordos Basin.Statistical methods and classification algorithms were applied to ana-lyze the test data,and common REE indicators were used to evaluate the properties of diagenetic fluids.[Results]The study reveals that matrix dolomite exhibits weak to moderate red luminescence under CL,with both zoned and uniform luminescence.Dolomite cements,with high Mn and Fe contents,are often zoned or non-luminescent.Analy-sis of variance(ANOVA)and Tukey's Honestly Significant Difference(HSD)post-hoc tests indicate that Fe,Mn,La,Ce,Pr,Nd,Sm,Eu,Gd,and Tb contents,and the Fe/Mn value significantly influence the CL of carbonate minerals.Non-luminescent and strongly luminescent groups are relatively easy to distinguish:non-luminescent miner-als have Fe contents greater than 10,000×10-6 or Mn contents less than 40×10-6.Additionally,the non-luminescent group with Fe contents over 10,000×10-6 displays REE distribution patterns enriched in Middle Rare Earth Elements(MREE),whereas the strongly luminescent group shows Light Rare Earth Elements(LREE)depletion and low Fe/Mn values.Using comprehensive dimensionality-reduced parameters of major/trace elements and REEs,in conjunc-tion with Mn content,effectively distinguishes the extremely weakly luminescent,weakly luminescent,and moder-ately luminescent groups.The nature of diagenetic fluids during diagenesis impacts carbonate sediment composition,mineral content,and major/trace element and REE variations,directly influencing carbonate mineral CL.[Conclu-sions]By combining in situ major/trace element testing with various data processing methods,this study provides a more quantitative understanding of the impact of major/trace element and REE contents on CL intensity.These find-ings offer valuable insights for scholars studying the factors affecting CL.