Stable isotopic evidence for methane seeps in Neoproterozoic postglacial cap carbonates / Jiang Ganqing, Martin J. Kennedy, Nicholas Christie-Blick.

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100 1# ‡aGanqing, Jiang.
245 10 ‡aStable isotopic evidence for methane seeps in Neoproterozoic postglacial cap carbonates /‡cJiang Ganqing, Martin J. Kennedy, Nicholas Christie-Blick.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2003.
300 ## ‡ap. 822-826 :‡bill., diags.
500 ## ‡aNature. Vol. 428(6968) :822-826 (2003).
520 3# ‡aReports carbon isotopic and petrographic data from a Neoproterozoic postglacial "cap carbonate" in south China that provides direct evidence for methane-influenced processes during deglaciation. The "cap carbonates", 1-5 m thick layers of particulate deep-water carbonate rocks overlying glacial deposits from era of severe glaciations 600 Myr ago, are associated with a prominent negative δ¹³C anomaly. Examines structure of deposits overlying Nantuo Formation in Yangtze platform and δ¹³C variations within, inferring deposition in vicinity of methane seeps and decomposition of methane hydrates during burial diagenesis. Addresses absence of such reports from elsewhere and supports hypothesis that methane hydrate destabilization contributed to strongly negative carbon isotopic anomalies following Neoproterozoic ice ages. This represents a less extreme environmental disturbance than implied by snowball Earth hypothesis to account for same anomalies.
530 ## ‡aAlso issued online ‡uurn:doi:10.1038/nature02201‡uhttps://dx.doi.org/10.1038/nature02201
650 07 ‡a551.58 -- Climatology.‡2udc
650 07 ‡a551.8 -- Palaeogeography.‡2udc
650 07 ‡a551.336 -- Ice ages.‡2udc
650 07 ‡a551.583.7 -- Palaeoclimatology.‡2udc
650 07 ‡a551.72 -- Proterozoic.‡2udc
650 07 ‡a551.35 -- Marine sediments.‡2udc
650 07 ‡a551.241 -- Plate tectonics.‡2udc
650 07 ‡a551.577 -- Precipitation.‡2udc
650 07 ‡a551.311.23 -- Weathering.‡2udc
650 07 ‡a546.26 -- Carbon.‡2udc
650 07 ‡a547.211 -- Methane.‡2udc
650 07 ‡a54.027 -- Isotope analysis.‡2udc
650 07 ‡a551.588.5 -- Climate, relationship with ice.‡2udc
650 07 ‡a551.590.3 -- Volcanic eruptions, effect on weather and climate.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aE7 -- Glaciology: glacial geology and ice ages.‡2local
651 #7 ‡a(510) -- People's Republic of China.‡2udc
700 1# ‡aKennedy, Martin J.
700 1# ‡aChristie-Blick, Nicholas.
773 0# ‡7nnas ‡tNature. ‡gVol. 428(6968) (2003) ‡wSPRI-1046
917 ## ‡aUnenhanced record from Muscat, imported 2019
948 3# ‡a20240419