Study on the continuous determination of pyrite content and its sulfur isotope composition in sedimentary rock
The study of pyrite content and its sulfur isotope composition in sedimentary rock can be used to judge the characteristics of sedimentary environment and reversely deduct the information of diagenesis and mineralization.A set of multi-channel pyrite sulfur extraction device were designed.The heating temperature of the device was determined to be 130℃,and the experiment time was 2 hours.Only one extraction experiment is needed to determine the sulfur content by methylene blue spectrophotometry and the sulfur isotope composition of pyrite by element analyzer gas isotope mass spectrometry.The R2 of the standard curve of methylene blue spectrophotometry was 0.999 9,the recovery rate of pyrite sample was 94%～100%,and the relative standard deviation of 10 measurements was 1.9%.The test results of the sulfur isotope composition of silver sulfide transformed from pyrite through chromium reduction extraction were consistent with the test results of original pyrite within the error range,and the accuracy was less than 0.2 ‰,which can meet the sulfur isotope test requirements of pyrite sulfur in sedimentary rock.
sedimentary rockpyrite contentsulfur isotope compositionmethylene blue spectrophotometryEA-IRMS
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