Variations in analytical results of commonly used major and trace elements and isotopic analyses in carbonate studies:a case study on the Lower Cambrian Longwangmiao Formation in central Sichuan Basin
Liu Da-Wei1, Cai Chun-Fang2,3, Hu Yong-Jie4, Jiang Lei2,3, Li Rui5, He Hong1, Wang Shi1, Peng Yan-Yan2,3, Wei Tian-Yuan2,3, Liu Qi-Yuan1
1 Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China; 2 Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China; 3 College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China; 4 International Petroleum Exploration and Production Corporation,SINOPEC,Beijing 100029,China; 5 School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China
Abstract：There are multiple methods of analyzing trace elements and isotopes in studies on carbonate. Are there any differences in the actual geochemical information obtained by different methods?Are those results possibly to compare with each other?In this paper,we compare the results of the main trace element tests(electron probe micro-analyzer[EPMA], laser ablation-plasma mass spectrometry[LA-ICP-MS], and solution method trace[ICP-OES])and oxygen isotope measurements(in-situ ion probe[in-situ SIMS],and acid soluble powder)commonly used in carbonate studies. Taking the carbonates in the Lower Cambrian Longwangmiao Formation in central Sichuan Basin as an example,we reveal the variability in the results of different test methods,in order to provide references for reducing multi-resolution of geochemical information. The study reveals: (1)the variability among the test means(EPMA,LA-ICP-MS and ICP-OES)objectively exists,but the overall bias of the test results decreases with the increase of concentration of measured elements. For the major elements(>10%),the standard deviation of each test result is less than 2%;For the enriched trace elements(>1000 μg/g),the results are within the test error and the standard deviation of the results is less than 6%;For the concentration range of trace elements(100-1000 μg/g),the standard deviation of each test result increases significantly. The deviations of LA-ICP-MS and ICP-OES results are smaller than that of LA-ICP-MS and EPMA,with the deviations of the former increasing from 6% to 45% and those of the latter increasing from 9.1% to 151%. In the concentration range below 100 μg/g,the deviations of LA-ICP-MS and ICP-OES results can be several times different due to the heterogeneity within the minerals. (2)It was found that the deviation of the EPMA results from the LA-ICP-MS results in the adjacent detection line interval(ranging from 100 to 300 μg/g)gradually increases under the micro-area limitation,and it was speculated that this deviation was caused by the correction compensation mechanism for low content elements in the EPMA result correction process. (3)The in-situ SIMS oxygen isotope values reveal the differences in δ18O values at the micro-regional scale of minerals,but the overall test results are 0.5‰~2.5‰ V-PDB negative bias. Presumably,this deviation may come from the specimen correction conversion errors. (4)The cathodoluminescence characteristics of the samples are not related to the Fe or Mn contents,and thus it needs to explore the fluid source in conjunction with lithological and geochemical evidence.
Liu Da-Wei,Cai Chun-Fang,Hu Yong-Jie et al. Variations in analytical results of commonly used major and trace elements and isotopic analyses in carbonate studies:a case study on the Lower Cambrian Longwangmiao Formation in central Sichuan Basin[J]. JOPC, 2022, 24(3): 524-539.
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