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《Earth Science》 2017-12
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The Application of the Handheld Energy-Dispersive X-Ray Fluorescence(ED-XRF)in the Cyclostratigraphy Research——A Case Study from the Xiagou Formation of the Lower Cretaceous in the Qingxi Sag,Jiuquan Basin

Cao Haiyang;Wang Hua;Zhao Rui;Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences;Faculty of Earth Resources,China University of Geoscience;  
The high resolution geochemical data are used as important proxies in cyclostratigraphy,which cost a lot of time and money to obtain the data in the usual way(ICP-MS or WD-XRF).And the handheld energy-dispersive X-ray fluorescence(EDXRF)can obtain the high resolution geochemical data efficiently.Currently,the handheld energy-dispersive X-ray fluorescence(ED-XRF)was few used in the study of sedimentary strata,especially in cyclostratigraphy research field.Continuous core samples of deep lacustrine mudstone and dolomitic mudstone were selected from the Xiagou Formation of the Lower Cretaceous in the Qingxi Sag,Jiuquan Basin.Content of 24 major elements and trace elements which can be used as important proxies in cyclostratigraphy were accurately measured under the Handheld energy-dispersive X-ray fluorescence(ED-XRF)testing,a nondestructive,direct method with high precision in an efficiency way which can test one single sample in five minutes.Ratios of obtained geochemical data(K/Al,Ca/Al,Si/Al,Fe/Al,Ti/Al,Mn/Al,Ni/Al,Zn/Al and Pb/Al)were analyzed by spectral methods further.Such results presented cycle wavelengths in the stratigraphic units show a value of 20.25∶4.75∶1.75∶1.00,corresponding with those of Milankovitch cycle periods(400 ka(long eccentricity)∶95 ka(short eccentricity)∶37 ka(obliquity)∶20 ka(precession),respectively)in Well W2.The correspondences between the sedimentary cycle ratios and the Milankovitch cycle periods indicates controlling effect of astronomical factors on sedimentation.ED-XRFprovide the new possibilities in detection and quantification of geological processes,and have great significance in establishing geological time series.
【Fund】: 国家科技重大专项课题(No.2016ZX05006006-002)
【CateGory Index】: P539;P618.13
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