Large-Amplitude Variations in Carbon Cycling and Terrestrial Weathering during the Latest Paleocene and Earliest Eocene: The Record at Mead Stream, New Zealand

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dc.citation.firstpage487en_US
dc.citation.issueNumber5en_US
dc.citation.journalTitleThe Journal of Geologyen_US
dc.citation.lastpage505en_US
dc.citation.volumeNumber120en_US
dc.contributor.authorSlotnick, Benjamin S.en_US
dc.contributor.authorDickens, Gerald R.en_US
dc.contributor.authorNicolo, Micah J.en_US
dc.contributor.authorHollis, Christopher J.en_US
dc.contributor.authorCrampton, James S.en_US
dc.contributor.authorZachos, James C.en_US
dc.contributor.authorSluijs, Appyen_US
dc.date.accessioned2016-01-29T20:03:39Zen_US
dc.date.available2016-01-29T20:03:39Zen_US
dc.date.issued2012en_US
dc.description.abstractThe late Paleocene to early Eocene was marked by major changes in Earth surface temperature and carbon cycling. This included at least two, and probably more, geologically brief (<200-k.yr.) intervals of extreme warming, the Paleocene-Eocene thermal maximum (PETM) and the Eocene thermal maximum-2 (ETM-2). The long-term rise in warmth and short-term “hyperthermal” events have been linked to massive injections of 13C-depleted carbon into the ocean-atmosphere system and intense global climate change. However, the causes, environmental impact, and relationships remain uncertain because detailed and coupled proxy records do not extend across the entire interval of interest; we are still recognizing the exact character of the hyperthermals and developing models to explain their occurrence. Here we present lithologic and carbon isotope records for a 200-m-thick sequence of latest Paleocene– earliest Eocene upper slope limestone exposed along Mead Stream, New Zealand. New carbon isotope and lithologic analyses combined with previous work on this expanded section shows that the PETM and ETM-2, the suspected H-2, I-1, I-2, and K/X hyperthermals, and several other horizons are marked by pronounced negative carbon isotope excursions and clay-rich horizons. Generally, the late Paleocene–early Eocene lithologic and δ¹³C records at Mead Stream are similar to records recovered from deep-sea sites, with an important exception: lows in δ¹³C and carbonate content consistently span intervals of relatively high sedimentation (terrigenous dilution) rather than intervals of relatively low sedimentation (carbonate dissolution). These findings indicate that, over ~6 m.yr., there was a series of short-termclimate perturbations, each characterized by massive input of carbon and greater continental weathering. The suspected link involves global warming, elevated greenhouse-gas concentrations, and enhanced seasonal precipitation.en_US
dc.identifier.citationSlotnick, Benjamin S., Dickens, Gerald R., Nicolo, Micah J., et al.. "Large-Amplitude Variations in Carbon Cycling and Terrestrial Weathering during the Latest Paleocene and Earliest Eocene: The Record at Mead Stream, New Zealand." <i>The Journal of Geology,</i> 120, no. 5 (2012) University of Chicago Press: 487-505. http://dx.doi.org/10.1086/666743.en_US
dc.identifier.doihttp://dx.doi.org/10.1086/666743en_US
dc.identifier.urihttps://hdl.handle.net/1911/88269en_US
dc.language.isoengen_US
dc.publisherUniversity of Chicago Pressen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleLarge-Amplitude Variations in Carbon Cycling and Terrestrial Weathering during the Latest Paleocene and Earliest Eocene: The Record at Mead Stream, New Zealanden_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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