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Associate Researcher Han Fei Paid an Exchange Visit to the USA

2016/12/30 8:53:43

Invited byProfessor Lewis Owen - the Director of the Department of Geology, University of Cincinnati, Associate Researcher Han Fei of IGL paid a seven-weeksexchange visit to Cosmogenic Nuclide Laboratory of the department in April 2016.

Dating Late Cenozoic gravelsand bedrocksurfaces and determiningtheage and slip rate ofactive faults are difficulties of studyingactive tectonics all the time. Cosmogenic nuclide dating with10Be and 26A1 is an emerging radioisotopicgeological dating method developed in recent years. It not only coulddetermine the age of fine-grainsediments but also coarse detrital sediments, erraticboulder and fault bedrock surfaces. The purpose of this visit is to learn updatedexperimental techniques and experiences from the USlaboratoryand holdthe development trends of cosmogenic nuclide dating techniques aroundthe world,meanwhile completing cosmogenic nuclide samplesanalysis funded by IGCEA key project “exploratory research of dating geomorphic surfaces and faultbedrocks”.

By visiting Cosmogenic Nuclide Laboratoryin University of Cincinnati, Associate Researcher Han Fei isitemrewardedthe following things: (1) Applying infrared stimulated luminescence (IRSL) technology in the preparationof cosmogenic nuclide samples can be more efficiently and conveniently to detect the purity of quartz; (2) By adopting a HClO4-dedicated laboratory fuming hood, the sample solutions may more safely and effectively complete conversion from F- system to Cl- system; (3) The adoption of large-volume resin columns and ion exchange resin may effectively remove interferingions in the sample and at tne same timesimplify Be/Al separation operation process. Meanwhile, by visiting Purdue Rare Isotope Measurement Laboratory(PRIME Lab), which has a cooperationwith the Department of Geology, University of Cincinnati, Associate Researcher Han Fei learnt that themeasurement accuracy of A1by AMSin PRIME lab has been improved ( < 3%)by installing an inflatable magnet In addition, the laboratory is attempting to establish a feldspar sample 36Cldating experimental protocol. It is also a world’s cutting-edge technology for cosmogenic nuclide dating.

Through this visit, Associate Researcher Han Fei completed nuclide chemical separation and target preparation of fault surfaces bedrock samples of Kongur Fault of Pamir Plateau and Langshan Fault of Inner Mongolia, and also analyzed the Xiyu conglomerate burial dating samples funded by NSFC. Through the visit,  Professor Lewis Owenexpressed an intention for further cooperationwithAssociate Researcher Han Fei onbedrock fault dating.