Missing Lead and High 3He/4He in Ancient Sulfides Associated with Continental Crust Formation

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dc.citation.journalTitleScientific Reportsen_US
dc.citation.volumeNumber4en_US
dc.contributor.authorHuang, Shichunen_US
dc.contributor.authorLee, Cin-Ty A.en_US
dc.contributor.authorYin, Qing-Zhuen_US
dc.date.accessioned2014-10-07T21:52:27Z
dc.date.available2014-10-07T21:52:27Z
dc.date.issued2014en_US
dc.description.abstractMajor 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.en_US
dc.identifier.citationHuang, Shichun, Lee, Cin-Ty A. and Yin, Qing-Zhu. "Missing Lead and High 3He/4He in Ancient Sulfides Associated with Continental Crust Formation." <i>Scientific Reports,</i> 4, (2014) Nature Publishing Group: http://dx.doi.org/10.1038/srep05314.
dc.identifier.doihttp://dx.doi.org/10.1038/srep05314en_US
dc.identifier.urihttps://hdl.handle.net/1911/77429
dc.language.isoengen_US
dc.publisherNature Publishing Group
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.
dc.titleMissing Lead and High 3He/4He in Ancient Sulfides Associated with Continental Crust Formationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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