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dc.contributor.authorHuang, Shichun
Lee, Cin-Ty A.
Yin, Qing-Zhu
dc.date.accessioned 2014-10-07T21:52:27Z
dc.date.available 2014-10-07T21:52:27Z
dc.date.issued 2014
dc.identifier.citation Huang, Shichun, Lee, Cin-Ty A. and Yin, Qing-Zhu. "Missing Lead and High 3He/4He in Ancient Sulfides Associated with Continental Crust Formation." Scientific Reports, 4, (2014) Nature Publishing Group: http://dx.doi.org/10.1038/srep05314.
dc.identifier.urihttps://hdl.handle.net/1911/77429
dc.description.abstract Major terrestrial reservoirs have Pb isotopes more radiogenic than the bulk silicate Earth. This requires a missing unradiogenic Pb reservoir, which has been argued to reside in the lower continental crust or dissolved in the core. Chalcophile element studies indicate that continent formation requires the formation of sulfide-bearing mafic cumulates in arcs. Because Pb, but not U, partitions into sulfides, we show that continent formation must have simultaneously generated time-integrated unradiogenic Pb reservoirs composed of sulfide-bearing cumulates, now recycled back into the mantle or stored deep in the continental lithosphere. The generation of such cumulates could also lead to coupled He-Pb isotopic systematics because 4He is also produced during U-Th-Pb decay. Here, we show that He may be soluble in sulfide melts, such that sulfide-bearing cumulates would be enriched in both Pb and He relative to U and Th, “freezing” in He and Pb isotopes of the ambient mantle at the time of sulfide formation. This implies that ancient sulfide-bearing cumulates would be characterized by unradiogenic Pb and He isotopes (high-3He/4He). These primitive signatures are usually attributed to primordial, undifferentiated mantle, but in this case, they are the very imprint of mantle differentiation via continent formation.
dc.language.iso eng
dc.publisher Nature Publishing Group
dc.rights Article 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.
dc.title Missing Lead and High 3He/4He in Ancient Sulfides Associated with Continental Crust Formation
dc.type Journal article
dc.contributor.funder National Science Foundation
dc.contributor.funder National Aeronautics and Space Administration
dc.citation.journalTitle Scientific Reports
dc.citation.volumeNumber 4
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1038/srep05314
dc.identifier.pmcid PMC4060489
dc.identifier.pmid 24937103
dc.identifier.grantID EAR 1119315 (National Science Foundation)
dc.identifier.grantID EAR 1144727 (National Science Foundation)
dc.identifier.grantID NNX11AJ51G (National Aeronautics and Space Administration)
dc.type.publication publisher version


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