In:
Science, American Association for the Advancement of Science (AAAS), Vol. 354, No. 6312 ( 2016-11-04), p. 626-629
Abstract:
Seawater 234 U/ 238 U provides global-scale information about continental weathering and is vital for marine uranium-series geochronology. Existing evidence supports an increase in 234 U/ 238 U since the last glacial period, but the timing and amplitude of its variability has been poorly constrained. Here we report two seawater 234 U/ 238 U records based on well-preserved deep-sea corals from the low-latitude Atlantic and Pacific Oceans. The Atlantic 234 U/ 238 U started to increase before major sea-level rise and overshot the modern value by 3 per mil during the early deglaciation. Deglacial 234 U/ 238 U in the Pacific converged with that in the Atlantic after the abrupt resumption of Atlantic meridional overturning. We suggest that ocean mixing and early deglacial release of excess 234 U from enhanced subglacial melting of the Northern Hemisphere ice sheets have driven the observed 234 U/ 238 U evolution.
Type of Medium:
Online Resource
ISSN:
0036-8075
,
1095-9203
DOI:
10.1126/science.aag1015
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2016
detail.hit.zdb_id:
128410-1
detail.hit.zdb_id:
2066996-3
detail.hit.zdb_id:
2060783-0
SSG:
11
