Early hydrothermal carbon uptake by the upper oceanic crust: Insight from in situ U-Pb dating

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dc.contributor.authorCoogan, Laurence A.
dc.contributor.authorParrish, Randall R.
dc.contributor.authorRoberts, Nick M.W.
dc.date.accessioned2018-09-27T18:51:47Z
dc.date.available2018-09-27T18:51:47Z
dc.date.copyright2016en_US
dc.date.issued2016
dc.description.abstractIt is widely thought that continental chemical weathering provides the key feedback that prevents large fluctuations in atmospheric CO2, and hence surface temperature, on geological time scales. However, low-temperature alteration of the upper oceanic crust in off-axis hydrothermal systems provides an alternative feedback mechanism. Testing the latter hypothesis requires understanding the timing of carbonate mineral formation within the oceanic crust. Here we report the first radiometric age determinations for calcite formed in the upper oceanic crust in eight locations globally via in-situ U-Pb laser ablation–inductively coupled plasma–mass spectrometry analysis. Carbonate formation occurs soon after crustal accretion, indicating that changes in global environmental conditions will be recorded in changing alteration characteristics of the upper oceanic crust. This adds support to the interpretation that large differences between the hydrothermal carbonate content of late Mesozoic and late Cenozoic oceanic crust record changes in global environmental conditions. In turn, this supports a model in which alteration of the upper oceanic crust in off-axis hydrothermal systems plays an important role in controlling ocean chemistry and the long-term carbon cycle.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.identifier.citationCoogan, L.A., Parrish, R.R. & Roberts, N.M.W. (2016). Early hydrothermal carbon uptake by the upper oceanic crust: Insight from in situ U-Pb dating. Geology, 44(2), 147-150. https://doi.org/10.1130/G37212.1en_US
dc.identifier.urihttps://doi.org/10.1130/G37212.1
dc.identifier.urihttp://hdl.handle.net/1828/10104
dc.language.isoenen_US
dc.publisherGeologyen_US
dc.subjectabsolute ageen_US
dc.subjectDeep Sea Drilling Projecten_US
dc.subjectDSDP Site 534en_US
dc.subjectcarbonen_US
dc.subjectcarbonatesen_US
dc.subjectDSDP Site 163en_US
dc.subjectMesozoicen_US
dc.subjectmetalsen_US
dc.subjectMiddle Easten_US
dc.subjectPacific Oceanen_US
dc.subjectorthosilicatesen_US
dc.subjectTroodos Ophioliteen_US
dc.subjectAsiaen_US
dc.subjectBermuda Riseen_US
dc.subjectCenozoicen_US
dc.subjectisotope ratiosen_US
dc.subjectcrusten_US
dc.subjectEquatorial Pacificen_US
dc.subjectCyprusen_US
dc.subjectEast Pacificen_US
dc.subjectalkaline earth metalsen_US
dc.subjectDSDP Site 417en_US
dc.subjectstable isotopesen_US
dc.subjectLeg 76en_US
dc.subjectsilicatesen_US
dc.subjectSr-87/Sr-86en_US
dc.subjectisotopesen_US
dc.subjectzirconen_US
dc.subjectstrontiumen_US
dc.subjectAtlantic Oceanen_US
dc.subjectLeg 16en_US
dc.subjectNortheast Pacificen_US
dc.subjectzircon groupen_US
dc.subjectIPODen_US
dc.subjectnesosilicatesen_US
dc.subjectNorth Atlanticen_US
dc.subjectNorth Pacificen_US
dc.subjectU/Pben_US
dc.titleEarly hydrothermal carbon uptake by the upper oceanic crust: Insight from in situ U-Pb datingen_US
dc.typePostprinten_US

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