Do the trace element compositions of detrital zircons require Hadean continental crust?
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|Authors:||Coogan, Laurence A.; Hinton, Richard W.|
|Author Affiliations:||Primary: |
University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada
Edinburgh University, Edinburgh EH9 3JW, United Kingdom
|Volume Title:||Geology (Boulder)|
|Source:||Geology (Boulder), 34(8), p.633-636. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613|
|Note:||In English. With GSA Data Repository Item 2006130. 41 refs.; illus.|
|Summary:||The trace element compositions of Hadean zircons have been used in two ways to argue for the existence of Hadean continental crust. One argument is based on low crystallization temperatures of Hadean zircons that have been determined using a novel geothermometer based on the Ti content of zircons in equilibrium with rutile. The second argument is based on using the trace element abundances in zircons to calculate their parental melt compositions, especially the rare earth elements. Here we demonstrate that zircons that grow from a melt formed by basalt differentiation at modern mid-ocean ridges cannot be unambiguously distinguished from Hadean zircons on either of these grounds. Thus, we conclude that the trace element compositions of Hadean zircons are permissive of models that do not include the generation of continental crust in the Hadean.|
|Subjects:||Archean; Continental crust; Crust; Crystal chemistry; Crystal growth; Detritus; Experimental studies; Gabbros; Geochemical indicators; Geochemistry; Geologic thermometry; Hadean; Igneous rocks; Laboratory studies; Metals; Mid-ocean ridges; Modern analogs; Nesosilicates; Oceanic crust; Orthosilicates; Paleoarchean; Plutonic rocks; Precambrian; Rare earths; Silicates; Trace elements; Zircon; Zircon group; Atlantic Ocean; East Pacific; East Pacific Rise; Equatorial Pacific; Hess Deep; Mid-Atlantic Ridge; North Pacific; Northeast Pacific; Pacific Ocean|
|Copyright Information:||GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States|
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