{"refrec":{"BRefID":337216,"RR":"<b>Dearing Crampton-Flood, E.; van der Weijst, C.M.H.; van der Molen, G.; Bouquet, M.; Yedema, Y.; Donders, T.H.; Sangiorgi, F.; Sluijs, A.; Sinninghe Damsté, J.S; Peterse, F</b> (2021). Identifying marine and freshwater overprints on soil-derived branched GDGT temperature signals in Pliocene Mississippi and Amazon River fan sediments. <i>Org. Geochem. 154</i>: 104200. <a href=\"https://doi.org/10.1016/j.orggeochem.2021.104200\" target=\"_blank\">https://doi.org/10.1016/j.orggeochem.2021.104200</a>","BEntID":333838,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Org. Geochem. 154</i>: 104200. <a href=\"https://doi.org/10.1016/j.orggeochem.2021.104200\" target=\"_blank\">https://doi.org/10.1016/j.orggeochem.2021.104200</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Dearing Crampton-Flood, E.; van der Weijst, C.M.H.; van der Molen, G.; Bouquet, M.; Yedema, Y.; Donders, T.H.; Sangiorgi, F.; Sluijs, A.; Sinninghe Damsté, J.S; Peterse, F","OrigTitleTranslFlag":0,"Authorstringtrunc":"Dearing Crampton-Flood, E. <i>et al.</i>","Englishabstract":"The fractional abundance of branched glycerol dialkyl glycerol tetraether    (brGDGT) membrane lipids in coastal marine sediments has been posited as a    proxy for the reconstruction of terrestrial temperatures on the nearby    land, based on the assumption that they are produced in soils and delivered    to the marine realm by rivers following erosion. Here, we test the    suitability of brGDGTs as a continental paleothermometer in Pliocene age    sediments from the northern Gulf of Mexico (GoM; speculated Mississippi    River input) and the Ceará Rise (speculated Amazon River input). Low    branched to isoprenoid tetraether (BIT) index values of 0.00–0.13 and the    near absence of pollen and long-chain plant waxes in the GoM sediments    suggest that the Mississippi River did not have a strong influence on the    delivery of terrestrial organic matter to the site during the Pliocene and    soil input was limited. Indeed, the high weighted average of    cyclopentane-containing tetramethylated brGDGTs (#rings<sub>tetra</sub>) in    the GoM sediments (0.50 ± 0.09) relative to that of modern soils from the    Mississippi catchment (0.25 ± 0.16) indicates that the brGDGTs in the GoM    sediments were mostly produced in situ in the marine realm, hampering    reliable land temperature reconstruction using the global soil transferfunction. In contrast, high BIT index values (0.46 ± 0.21) and low #rings    <sub>tetra</sub> (0.25 ± 0.15) in sediments from the Ceará Rise suggest    that these brGDGTs are primarily derived from soils. However, reconstructed    temperatures were 11–18 °C lower than modern Amazon catchment temperatures.    The relative abundance of 6-methylated brGDGTs (Isomerisation Ratio; IR) in    the sediments is 0.82 ± 0.10, which resembles that of suspended particulate    matter (SPM) in the modern Amazon River more than that of catchment soils    (IR = 0.18 ± 0.18). This reveals that brGDGTs in the Ceará Rise sediments    likely have a freshwater, riverine origin. Thus, the majority of the    brGDGTs in both the GoM and Ceará Rise sediments are produced in situ, in    the marine or river realms, which precludes application of the brGDGT    paleothermometer. Our study shows that the sources of brGDGTs in coastal    marine sediment archives must be critically evaluated prior to using the    proxy for paleoclimate reconstruction.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Identifying marine and freshwater overprints on soil-derived branched GDGT temperature signals in Pliocene Mississippi and Amazon River fan sediments","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-09 01:32:13.191850","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"BrGDGTs; Pliocene; Terrestrial temperature; Proxy limitations","OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2021-05-17","DateCreate":"2021-05-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000636772300003","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.orggeochem.2021.104200"},"refs":null,"anarec":{"AnaID":337216,"PubliDate":2021,"Pagination":"104200","XtraPublOfAnaID":null,"ISBN":null,"Volume":"154","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":111331,"SerRR":"Organic Geochemistry. 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