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Article: Recalibrating Rodinian rifting in the northwestern United States

TitleRecalibrating Rodinian rifting in the northwestern United States
Authors
Issue Date2021
PublisherGeological Society of America. The Journal's web site is located at http://www.geosociety.org/pubs/
Citation
Geology, 2021, v. 49 n. 6, p. 617-622 How to Cite?
AbstractA lack of precise age constraints for Neoproterozoic strata in the northwestern United States (Washington State), including the Buffalo Hump Formation (BHF), has resulted in conflicting interpretations of Rodinia amalgamation and breakup processes. Previous detrital zircon (DZ) studies identified a youngest ca. 1.1 Ga DZ age population in the BHF, interpreted to reflect mostly first-cycle sourcing of unidentified but proximal magmatic rocks intruded during the amalgamation of Rodinia at ca. 1.0 Ga. Alternatively, the ca. 1.1 Ga DZ population has been suggested to represent a distal source with deposition occurring during the early phases of Rodinia rifting, more than 250 m.y. after zircon crystallization. We combined conventional laser-ablation split-stream analyses of U-Pb/Lu-Hf isotopes in zircon with a method of rapid (8 s per spot) U-Pb analysis to evaluate these opposing models. Our study of ∼2000 DZ grains from the BHF identified for the first time a minor (∼1%) yet significant ca. 760 Ma population, which constrains the maximum depositional age. This new geochronology implies that the BHF records early rift deposition during the breakup of Rodinia and correlates with sedimentary rocks found in other late Tonian basins of southwestern Laurentia.
Persistent Identifierhttp://hdl.handle.net/10722/308458
ISSN
2023 Impact Factor: 4.8
2023 SCImago Journal Rankings: 2.330
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorBrennan, DT-
dc.contributor.authorLi, ZX-
dc.contributor.authorRankenburg, K-
dc.contributor.authorEvans, N-
dc.contributor.authorLink, PK-
dc.contributor.authorNordsvan, AR-
dc.contributor.authorKirkland, CL-
dc.contributor.authorMahoney, JB-
dc.contributor.authorJohnson, T-
dc.contributor.authorMcDonald, BJ-
dc.date.accessioned2021-12-01T07:53:37Z-
dc.date.available2021-12-01T07:53:37Z-
dc.date.issued2021-
dc.identifier.citationGeology, 2021, v. 49 n. 6, p. 617-622-
dc.identifier.issn0091-7613-
dc.identifier.urihttp://hdl.handle.net/10722/308458-
dc.description.abstractA lack of precise age constraints for Neoproterozoic strata in the northwestern United States (Washington State), including the Buffalo Hump Formation (BHF), has resulted in conflicting interpretations of Rodinia amalgamation and breakup processes. Previous detrital zircon (DZ) studies identified a youngest ca. 1.1 Ga DZ age population in the BHF, interpreted to reflect mostly first-cycle sourcing of unidentified but proximal magmatic rocks intruded during the amalgamation of Rodinia at ca. 1.0 Ga. Alternatively, the ca. 1.1 Ga DZ population has been suggested to represent a distal source with deposition occurring during the early phases of Rodinia rifting, more than 250 m.y. after zircon crystallization. We combined conventional laser-ablation split-stream analyses of U-Pb/Lu-Hf isotopes in zircon with a method of rapid (8 s per spot) U-Pb analysis to evaluate these opposing models. Our study of ∼2000 DZ grains from the BHF identified for the first time a minor (∼1%) yet significant ca. 760 Ma population, which constrains the maximum depositional age. This new geochronology implies that the BHF records early rift deposition during the breakup of Rodinia and correlates with sedimentary rocks found in other late Tonian basins of southwestern Laurentia.-
dc.languageeng-
dc.publisherGeological Society of America. The Journal's web site is located at http://www.geosociety.org/pubs/-
dc.relation.ispartofGeology-
dc.titleRecalibrating Rodinian rifting in the northwestern United States-
dc.typeArticle-
dc.identifier.emailNordsvan, AR: nordsvan@hku.hk-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1130/G48435.1-
dc.identifier.scopuseid_2-s2.0-85103370067-
dc.identifier.hkuros330540-
dc.identifier.volume49-
dc.identifier.issue6-
dc.identifier.spage617-
dc.identifier.epage622-
dc.identifier.isiWOS:000663714600001-
dc.publisher.placeUnited States-

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