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 age
dc.subjectDeep Sea Drilling Project
dc.subjectDSDP Site 534
dc.subjectcarbon
dc.subjectcarbonates
dc.subjectDSDP Site 163
dc.subjectMesozoic
dc.subjectmetals
dc.subjectMiddle East
dc.subjectPacific Ocean
dc.subjectorthosilicates
dc.subjectTroodos Ophiolite
dc.subjectAsia
dc.subjectBermuda Rise
dc.subjectCenozoic
dc.subjectisotope ratios
dc.subjectcrust
dc.subjectEquatorial Pacific
dc.subjectCyprus
dc.subjectEast Pacific
dc.subjectalkaline earth metals
dc.subjectDSDP Site 417
dc.subjectstable isotopes
dc.subjectLeg 76
dc.subjectsilicates
dc.subjectSr-87/Sr-86
dc.subjectisotopes
dc.subjectzircon
dc.subjectstrontium
dc.subjectAtlantic Ocean
dc.subjectLeg 16
dc.subjectNortheast Pacific
dc.subjectzircon group
dc.subjectIPOD
dc.subjectnesosilicates
dc.subjectNorth Atlantic
dc.subjectNorth Pacific
dc.subjectU/Pb
dc.subject.departmentDepartment of Earth and Ocean Sciences
dc.subject.departmentSchool of Earth and Ocean Sciences
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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