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Primordial neon in high-³He/⁴He Baffin Island olivines

Horton, F. and Curtice, J. and Farley, K. A. and Kurz, M. D. and Asimow, P. D. and Treffkorn, J. and Boyes, X. M. (2021) Primordial neon in high-³He/⁴He Baffin Island olivines. Earth and Planetary Science Letters, 558 . Art. No. 116762. ISSN 0012-821X. https://resolver.caltech.edu/CaltechAUTHORS:20210318-103515860

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Abstract

Paleocene basaltic lavas exposed on Baffin Island have the highest ³He/⁴He found in any terrestrial igneous rocks and potentially contain the most pristine primordial mantle material exposed on Earth's surface. By vacuum-crushing large (1–3 g) olivine mineral separates, we extracted enough magmatic gas to obtain the first coupled helium, neon, and argon isotopic compositions of Baffin Island lavas. The five Baffin Island olivine samples have ³He/⁴He ranging from 36.2 ± 0.6 to 48.6 ± 1.3 (1σ) times the atmospheric ratio (Ra), overlapping with the highest known mantle values. Neon isotopic results fall on a mixing line between atmosphere and a high ²⁰Ne/²²Ne mantle endmember (with a maximum ²⁰Ne/²²Ne of 12.2). The slope of this mixing line is indistinguishable from that in subglacial Holocene glass from Iceland, but distinct from other hotspots and mid-ocean ridge basalt trends. This result supports the hypothesis that Baffin Island and Iceland lavas share a common high-³He/⁴He mantle component, despite the fact that recent paleogeographic reconstructions place the Iceland hotspot far from Baffin Island at the time of eruption (61 Ma). Our results also demonstrate that high-³He/⁴He mantle reservoirs have ³He/²²Ne variability that either reflects ancient mantle heterogeneity or helium addition in the upper or lower mantle.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.epsl.2021.116762DOIArticle
ORCID:
AuthorORCID
Farley, K. A.0000-0002-7846-7546
Kurz, M. D.0000-0003-1745-2356
Asimow, P. D.0000-0001-6025-8925
Boyes, X. M.0000-0002-6607-9757
Alternate Title:Primordial neon in high-3He/4He Baffin Island olivines
Additional Information:© 2021 Elsevier B.V. Received 7 October 2020, Revised 11 December 2020, Accepted 11 January 2021, Available online 25 January 2021. The National Science Foundation (award #1911699) funded this research. The Woods Hole Oceanographic Institution (WHOI) Andrew W. Mellon Foundation Endowed Fund for Innovative Research and a National Geographic Society grant (#CP4-144R-18) supported fieldwork activities. The WHOI noble gas lab was supported by NSF OCE #1259218 and WHOI. We thank Maryse Mahy of the Parks Canada Nunavut Field Unit, the Qikiqtani Inuit Association, and the Nunavut Research Institute for their assistance and cooperation. Victoria Hooton provided invaluable help with mineral separation. Two anonymous reviews improved the manuscript. CRediT authorship contribution statement: F. Horton: Conceptualization, Formal analysis, Funding acquisition, Methodology, Supervision, Visualization, Writing – original draft. J. Curtice: Formal analysis, Investigation. K.A. Farley: Conceptualization, Funding acquisition, Investigation, Methodology, Resources, Supervision. M.D. Kurz: Investigation, Resources, Writing – review & editing. P.D. Asimow: Conceptualization, Funding acquisition, Supervision, Writing – review & editing. J. Treffkorn: Formal analysis, Investigation, Writing – original draft. X.M. Boyes: Formal analysis, Investigation. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funders:
Funding AgencyGrant Number
NSFEAR-1911699
Woods Hole Oceanographic InstitutionUNSPECIFIED
Andrew W. Mellon FoundationUNSPECIFIED
National Geographic SocietyCP4-144R-18
NSFOCE-1259218
Subject Keywords:primordial mantle; hotspot lavas; neon isotopes; noble gas geochemistry
Record Number:CaltechAUTHORS:20210318-103515860
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210318-103515860
Official Citation:F. Horton, J. Curtice, K.A. Farley, M.D. Kurz, P.D. Asimow, J. Treffkorn, X.M. Boyes, Primordial neon in high-3He/4He Baffin Island olivines, Earth and Planetary Science Letters, Volume 558, 2021, 116762, ISSN 0012-821X, https://doi.org/10.1016/j.epsl.2021.116762. (https://www.sciencedirect.com/science/article/pii/S0012821X21000212)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108479
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Mar 2021 00:20
Last Modified:19 Mar 2021 00:20

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