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  • *Fossils  (1)
  • 108-664C; 130-806B; Aluminium/Calcium ratio; Barium/Calcium ratio; Boron/Calcium ratio; Cadmium/Calcium ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg108; Leg130; Lithium/Calcium ratio; Magnesium/Calcium ratio; Manganese/Calcium ratio; Negative-thermal ionization mass spectrometry (N-TIMS); Neodymium/Calcium ratio; North Pacific Ocean; Ocean Drilling Program; ODP; PC; Piston corer; RC14; RC14-37; Replicates; Robert Conrad; Sample code/label; Size fraction; Sodium/Calcium ratio; South Atlantic Ocean; Species; Strontium/Calcium ratio; Uranium/Calcium ratio; δ11B; δ11B, standard deviation  (1)
  • Humans
  • Life and Medical Sciences
  • 2005-2009  (2)
  • 2007  (2)
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  • 2005-2009  (2)
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  • 1
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    PANGAEA
    In:  Supplement to: Ni, Yunyan; Foster, Gavin L; Bailey, Trevor R; Elliott, Tim; Schmidt, Daniela N; Pearson, Paul N; Haley, Brian A; Coath, Chris (2007): A core top assessment of proxies for the ocean carbonate system in surface-dwelling foraminifers. Paleoceanography, 22(3), PA3212, https://doi.org/10.1029/2006PA001337
    Publication Date: 2024-01-09
    Description: We have assessed the reliability of several foraminifer-hosted proxies of the ocean carbonate system (d11B, B/Ca, and U/Ca) using Holocene samples from the Atlantic and Pacific oceans. We examined chemical variability over a range of test sizes for two surface-dwelling foraminifers (Globigerinoides sacculifer and Globigerinoides ruber). Measurements of d11B in G. ruber show no significant relationship with test size in either Atlantic or Pacific sites and appear to provide a robust proxy of surface seawater pH. Likewise there is no significant variability in the d11B of our Atlantic core top G. sacculifer, but we find that d11B increases with increasing test size for G. sacculifer in the Pacific. These systematic differences in d11B are inferred to be a consequence of isotopically light gametogenic calcite in G. sacculifer and its preferential preservation during postdepositional dissolution. The trace element ratio proxies of ocean carbonate equilibria, U/Ca and B/Ca, show systematic increases in both G. ruber and G. sacculifer with increasing test size, possibly as a result of changing growth rates. This behavior complicates their use in paleoceanographic reconstructions. In keeping with several previous studies we find that Mg/Ca ratios increase with increasing size fraction in our well-preserved Atlantic G. sacculifer but not in G. ruber. In contrast to previous interpretations we suggest that these observations reflect a proportionally larger influence of compositionally distinct gametogenic calcite in small individuals compared to larger ones. As with d11B this influences G. sacculifer but not G. ruber, which has negligible gametogenic calcite.
    Keywords: 108-664C; 130-806B; Aluminium/Calcium ratio; Barium/Calcium ratio; Boron/Calcium ratio; Cadmium/Calcium ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg108; Leg130; Lithium/Calcium ratio; Magnesium/Calcium ratio; Manganese/Calcium ratio; Negative-thermal ionization mass spectrometry (N-TIMS); Neodymium/Calcium ratio; North Pacific Ocean; Ocean Drilling Program; ODP; PC; Piston corer; RC14; RC14-37; Replicates; Robert Conrad; Sample code/label; Size fraction; Sodium/Calcium ratio; South Atlantic Ocean; Species; Strontium/Calcium ratio; Uranium/Calcium ratio; δ11B; δ11B, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 494 data points
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  • 2
    Publication Date: 2007-01-16
    Description: The lack of Late Pleistocene human fossils from sub-Saharan Africa has limited paleontological testing of competing models of recent human evolution. We have dated a skull from Hofmeyr, South Africa, to 36.2 +/- 3.3 thousand years ago through a combination of optically stimulated luminescence and uranium-series dating methods. The skull is morphologically modern overall but displays some archaic features. Its strongest morphometric affinities are with Upper Paleolithic (UP) Eurasians rather than recent, geographically proximate people. The Hofmeyr cranium is consistent with the hypothesis that UP Eurasians descended from a population that emigrated from sub-Saharan Africa in the Late Pleistocene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grine, F E -- Bailey, R M -- Harvati, K -- Nathan, R P -- Morris, A G -- Henderson, G M -- Ribot, I -- Pike, A W G -- New York, N.Y. -- Science. 2007 Jan 12;315(5809):226-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Anthropology and Anatomical Sciences, Stony Brook University, Stony Brook, NY 11794-4364, USA. fgrine@notes.cc.sunysb.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17218524" target="_blank"〉PubMed〈/a〉
    Keywords: Africa South of the Sahara ; Asia ; Emigration and Immigration ; Europe ; *Fossils ; Humans ; Mandible/anatomy & histology ; Maxilla/anatomy & histology ; Molar/anatomy & histology ; Paleodontology ; *Skull/anatomy & histology ; South Africa ; Time
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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