The U-series dating of (biogenic) carbonates

Details The U-series dating of (biogenic) carbonates The U-series dating of (biogenic) carbonates

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26es....5a2008h&link_type=abstract

IOP Conference Series: Earth and Environmental Science, Volume 5, Issue 1, pp. 012008 (2009).

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U- and Th-series offer a large array of isotopes that constitute magnifying "lenses" into recent temporal dimensions of Earth System processes. Whereas mass spectrometry (MS) measurements of 238U-234U-230Th and 235U-231Pa disequilibria give access to time ranges varying between about a million of years to hundreds of thousand years, MS or counting methods of shorter-lived daughter isotopes (e.g., 226Ra, 210 Pb, 234 Th, 228 Th, 228 Ra) inform on time scales varying from 50 ka (226Ra- 230Th "pseudo-concordias"), 10 ka (226Ra-excess method), 100 a (210Pb-226Ra "pseudo-Concordia" or 210Pb-excess method), 30 a (228Ra-excess), 10 a (228Th-228Ra-232Th disequilibria) and up to 3 months (234Th-excess). U-series isotopes, and especially the sequence 238U-234U-230Th revealed essential in validating the astronomical theory of climate through the dating of high interglacial sea levels and provided the means to calibrate the radiocarbon time scale into "calendar years". Shorter-lived natural isotopes of these series (e.g., 210Pb, 226Ra) also revealed essential for the documenting of more recent processes. Here, we examine U-series systematics in biogenic minerals with special attention to biogenic carbonates. We also discuss the impact of diagenetic conditions on dating applications.

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