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• W3021130223 abstract "Abstract Submarine volcanism in the western Arctic Ocean, known as Amerasia Basin, is attributed to a mantle plume based on geophysics and meager geochemical evidence. Basaltic samples dredged from Chukchi Borderland within the basin have produced minimum 40 Ar/ 39 Ar ages for eruption at circa 118–112, circa 105–100, and circa 90–70 Ma, which we use to constrain tectonic models for basin opening. Major oxide and trace element concentrations and Sr, Nd, and Hf isotopic ratios of the lavas show that the circa 118–112 Ma samples from Northwind Ridge are tholeiites (low‐Ti tholeiite I) with low degrees of rare‐earth element (REE) fractionation, high overall heavy rare‐earth element (HREE), and Mg# ( Mg‐number ), which suggests magma derivation from a garnet‐free source followed by minor crystal fractionation. Strontium, Nd, and Hf isotope systematics for these lavas and ratios of highly incompatible trace elements point toward a lithospheric source. Eruptions at circa 105–100 and circa 90–70 Ma, both at Healy Spur, produced two types of lavas: low‐Ti tholeiite II—which are generally older than high‐Ti tholeiite—both common in continental flood basalt (CFB) provinces and both with trace element abundance patterns typifying a garnet‐free source and significant crystal fractionation for the high‐Ti tholeiite. The isotope characteristics for both groups are common features of asthenospheric sources. Composition‐time relationships for the lavas suggest inception of melting in the subcontinental lithospheric mantle (SCLM)—probably due to introduction of a heat source by a plume—followed later (at ca. 105–100 and ca. 90–70 Ma) by asthenospheric melting possibly triggered by plume rise." @default.
• W3021130223 created "2020-05-13" @default.
• W3021130223 creator A5016014077 @default.
• W3021130223 creator A5024599191 @default.
• W3021130223 creator A5048580509 @default.
• W3021130223 creator A5066391659 @default.
• W3021130223 creator A5080601165 @default.
• W3021130223 date "2020-07-01" @default.
• W3021130223 modified "2023-10-09" @default.
• W3021130223 title "Basalts From the Chukchi Borderland: ⁴⁰Ar/³⁹Ar Ages and Geochemistry of Submarine Intraplate Lavas Dredged From the Western Arctic Ocean" @default.
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