Publication Date:
2022-05-25
Description:
Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. The definitive version was published in Geochimica et Cosmochimica Acta 159 (2015): 126-138, doi:10.1016/j.gca.2015.03.009.
Description:
Ooids are small, spherical to ellipsoidal grains composed of concentric layers of CaCO3 that could potentially serve as biogeochemical records of the environments in which they grew. Such records, however, must be placed in the proper temporal context. Therefore, we developed a novel acidification system and employed an accelerator mass spectrometer (AMS) with a gas accepting ion source to obtain radiocarbon (14C) chronologies extending radially through ooids within one 8-hour workday. The method was applied to ooids from Highborne Cay, Bahamas
and Shark Bay, Australia, yielding reproducible 14C chronologies, as well as constraints on the
rates and durations of ooid growth and independent estimates of local 14C reservoir ages.
Description:
This work was financially supported by a National Science Foundation (NSF) grant to RES (OCE-0926372) and a NSF Cooperative Agreement with NOSAMS (OCE-2310753487). Work at MIT was also supported by an award (NNA13AA90A) from the NASA Astrobiology Institute.
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
Format:
application/pdf
