Basalts from the Chukchi Borderland: 40Ar/39Ar ages and feochemistry of submarine intraplate lavas dredged from the western Arctic Ocean
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000129" target="_blank" >RIV/00025798:_____/20:00000129 - isvavai.cz</a>
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JB017604" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JB017604</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2019JB017604" target="_blank" >10.1029/2019JB017604</a>
Alternative languages
Result language
angličtina
Original language name
Basalts from the Chukchi Borderland: 40Ar/39Ar ages and feochemistry of submarine intraplate lavas dredged from the western Arctic Ocean
Original language description
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 40Ar/39Ar 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‐earthelement (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 patternstypifying 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‐timerelationships 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research -Solid Earth
ISSN
2169-9313
e-ISSN
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Volume of the periodical
125
Issue of the periodical within the volume
7 : e2019JB017604
Country of publishing house
US - UNITED STATES
Number of pages
41
Pages from-to
nestránkováno
UT code for WoS article
000577118900012
EID of the result in the Scopus database
2-s2.0-85088570805