{"refrec":{"BRefID":337792,"RR":"<b>Xiao, S.; Cui, H.; Kang, J.; McFadden, K.A.; Kaufman, A.J.; Kitajima, K.; Fournelle, J.H.; Schwid, M.; Nolan, M.; Baele, J.-M.; Valley, J.W.</b> (2020). Using SIMS to decode noisy stratigraphic δ<sup>13</sup>C variations in Ediacaran carbonates. <i>Precambr. Res. 343</i>: 105686. <a href=\"https://hdl.handle.net/10.1016/j.precamres.2020.105686\" target=\"_blank\">https://hdl.handle.net/10.1016/j.precamres.2020.105686</a>","BEntID":334416,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Precambr. Res. 343</i>: 105686. <a href=\"https://hdl.handle.net/10.1016/j.precamres.2020.105686\" target=\"_blank\">https://hdl.handle.net/10.1016/j.precamres.2020.105686</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Xiao, S.; Cui, H.; Kang, J.; McFadden, K.A.; Kaufman, A.J.; Kitajima, K.; Fournelle, J.H.; Schwid, M.; Nolan, M.; Baele, J.-M.; Valley, J.W.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Xiao, S. <i>et al.</i>","Englishabstract":"Carbonate carbon isotope (δ<sup>13</sup>C<sub>carb</sub>) chemostratigraphy is a valuable tool in Precambrian stratigraphic correlation. The effectiveness of this tool rests on the assumption that δ<sup>13</sup>C<sub>carb</sub> data record global seawater signals. However, in some cases δ<sup>13</sup>C<sub>carb</sub> data exhibit rapid and noisy stratigraphic variations that may have been influenced by authigenic or diagenetic carbonate minerals. To assess the contribution of non-primary minerals towards bulk carbonate carbon isotope values, we acquired SIMS (secondary ion mass spectrometry) δ<sup>13</sup>C<sub>carb</sub> data, electron microscopic data, and CL (cathodoluminescence) microscopic data from two Ediacaran successions—the lower Member II of the Doushantuo Formation in South China and the Mooifontein Member of the Zaris Formation in southern Namibia. The Doushantuo samples came from a stratigraphic interval with noisy meter-scale δ<sup>13</sup>C<sub>carb</sub> variations of up to 10‰, whereas the Mooifontein Member is characterized by consistent δ<sup>13</sup>C<sub>carb</sub> values with limited meter-scale variations of less than ~4‰. Our data show that the meter-scale stratigraphic variations in δ<sup>13</sup>C<sub>carb</sub> are also mirrored in the SIMS data at μm-mm scales in both Doushantuo and Mooifontein samples. In the Doushantuo samples, SIMS δ<sup>13</sup>C<sub>carb</sub> values of authigenic calcite vary by up to 10‰ over μm-mm scales and can be either higher or lower than those of the co-existing dolomite matrix, which also appears to be affected by authigenic carbonate on the basis of petrographic observation. Bulk-sample δ<sup>13</sup>C<sub>carb</sub> values measured on powders microdrilled from the same SIMS specimens are within the range of SIMS δ<sup>13</sup>C<sub>carb</sub> values. Thus, we infer that bulk-sample δ<sup>13</sup>C<sub>carb</sub> values of Doushantuo samples represent mixtures of different carbonate components. The Doushantuo and Mooifontein SIMS δ<sup>13</sup>C<sub>carb</sub> data validate the traditional method of using chemostratigraphic consistency to evaluate authigenic/diagenetic alteration, but given that secondary phases may be <sup>13</sup>C-enriched relative to matrix carbonate, caution is warranted when taking maximum values to approximate primary chemostratigraphic trends.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Using SIMS to decode noisy stratigraphic δ<sup>13</sup>C variations in Ediacaran carbonates","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-21 01:33:00.582686","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"SIMS; Stable carbon isotopes; Ediacaran; Chemostratigraphy; South China; Namibia","OtherDescriptors":null,"Notes":null,"AnaPub":2020,"MonPub":null,"DateUpdate":"2021-06-01","DateCreate":"2021-05-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000532835600001","VABBcode":null,"OpenAcc":0,"Handle":"10.1016/j.precamres.2020.105686"},"refs":null,"anarec":{"AnaID":337792,"PubliDate":2020,"Pagination":"105686","XtraPublOfAnaID":null,"ISBN":null,"Volume":"343","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43647,"SerRR":"Precambrian research. 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