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This contribution presents a new method for Re–Os isotope dating organic-rich sedimentary (ORS) rocks by thermal ionization mass spectrometry using an H2O2–HNO3 solution as the digestion medium, rather than CrO3–H2SO4 or inverse aqua regia. The main underlying principle of this method is that H2O2–HNO3 digestion would preferentially liberate hydrogenous Re and Os, and minimize the dissolution of non-hydrogenous...
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