Simplifying Age Progressions within the Cook‐Austral Islands using ARGUS‐VI High‐Resolution <sup>40</sup>Ar/<sup>39</sup>Ar Incremental Heating Ages

Rose, Joanna; Koppers, Anthony A. P.

doi:10.1029/2019gc008302

Cited by 19 publications

(3 citation statements)

References 77 publications

(221 reference statements)

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“…For two examples of appropriately formatted 40 Ar/ 39 Ar metadata files (J. Ross, 2020, personal commun. ; Rose and Koppers, 2019) archived via FAIR principles, see the Supplemental Materials. 1 Another alternative to publishing the full suite of 40 Ar/ 39 Ar metadata in the supplements of papers is to make that data open source and freely available via an online repository (e.g., github.com/NMGRL-Data/KvAges).…”

Section: Required Data and Metadatamentioning

confidence: 99%

Interpreting and reporting 40Ar/39Ar geochronologic data

et al. 2020

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The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby providing precise time constraints for a wide range of geologic and extraterrestrial processes. Analyses of increasingly smaller subsamples have revealed age dispersion in many materials, including some minerals used as neutron fluence monitors. Accordingly, interpretive strategies are evolving to address observed dispersion in dates from a single sample. Moreover, inferring a geologically meaningful “age” from a measured “date” or set of dates is dependent on the geological problem being addressed and the salient assumptions associated with each set of data. We highlight requirements for collateral information that will better constrain the interpretation of 40Ar/39Ar data sets, including those associated with single-crystal fusion analyses, incremental heating experiments, and in situ analyses of microsampled domains. To ensure the utility and viability of published results, we emphasize previous recommendations for reporting 40Ar/39Ar data and the related essential metadata, with the amendment that data conform to evolving standards of being findable, accessible, interoperable, and reusable (FAIR) by both humans and computers. Our examples provide guidance for the presentation and interpretation of 40Ar/39Ar dates to maximize their interdisciplinary usage, reproducibility, and longevity.

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Section: Required Data and Metadatamentioning

confidence: 99%

Interpreting and reporting 40Ar/39Ar geochronologic data

et al. 2020

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“…Rarotonga (1.157 to 1.697 Ma) and the young stage of Aitutaki (1.382 to 1.941 Ma) (Rose and Koppers, 2019), which are located over 1200 km southwest of Papatua and have EM1 isotopic compositions. Indeed, Chauvel et al (1997) noted that the Rarotonga hotspot is "less well expressed" than the other hotspots in the Cook-Austral Volcanic Lineament.…”

Section: Rarotonga Groupmentioning

confidence: 99%

Distinguishing Volcanic Contributions to the Overlapping Samoan and Cook-Austral Hotspot Tracks

Price

Jackson

Blichert‐Toft

et al. 2022

Journal of Petrology

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To deconvolve contributions from the four overlapping hotspots that form the “hotspot highway” on the Pacific plate—Samoa, Rarotonga, Arago-Rurutu, and Macdonald—we geochemically characterize and/or date (by the 40Ar/39Ar method) a suite of lavas sampled from the “downstream” Samoan hotspot track. We find that Papatua seamount, located ~60 km south of the axis of the Samoan hotspot track, has lavas with both a HIMU composition (206Pb/204Pb = 20.0), previously linked to one of the Cook-Austral hotspots, and an EM1 composition, which we interpret to be rejuvenated and Samoan in origin. We show that these EM1 rejuvenated lavas are geochemically similar to rejuvenated volcanism on Samoan volcanoes, and suggest that flexural uplift, caused by tectonic forces associated with the nearby Tonga trench, triggered a new episode of melting of Samoan mantle material that had previously flattened and spread laterally along the base of the Pacific plate under Papatua, resulting in volcanism that capped the previous HIMU edifice. We argue that this process generated Samoan rejuvenated volcanism on the older Cook-Austral volcano of Papatua. We also study Waterwitch seamount, located ~820 km WNW of the Samoan hotspot, and provide an age (10.49 ± 0.09 Ma) which places it on the Samoan hotspot trend, showing that it is genetically Samoan and not related to the Cook-Austral hotspots as previously suggested. Consequently, with the possible exception of the HIMU stage of Papatua seamount, there are currently no known Arago-Rurutu plume-derived lava flows sampled along the swath of Pacific seafloor that stretches between Rose seamount (~25 Ma) and East Niulakita seamount (~45 Ma), located 1400 km to the west. The “missing” ~20-million-year segment of the Arago-Rurutu hotspot track may have been subducted into the northern Tonga trench, or perhaps was covered by subsequent volcanism from the overlapping Samoan hotspot, and has thus eluded sampling. Finally, we explore tectonic reactivation as a cause for anomalously young volcanism present within the western end of the Samoan hotspot track.

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“…Volcanic eruptions open avenues to explore the composition and geodynamic evolution of the Earth's upper mantle. The eruptions of Ocean Island Basalt (OIB) volcanoes (such as in the Canary Islands, Samoa, Cook Islands, Azores, and Pitcairn; Anderson, 1912;Machado et al, 1962;Duncan et al, 1974;Rose and Koppers, 2019;Carracedo et al, 2022; exceptions are Hawaii, Iceland and the Piton de la Fournaise volcano at Reunion Islands), are especially attractive owing to their prevalent effusive nature and hence relatively easy access to eruption sites, relative to arc volcanoes which are characterized by more explosive activity. Moreover, OIB eruptions promote the investigation of deeper portions of the Earth's mantle when compared with Middle Oceanic Ridge Basalts, MORB (Herzberg et al, 2007;Hofmann, 2007;Dasgupta et al, 2010;Jackson, 2016), and eventually favors the exploration of the dynamics of mantle plumes (Dasgupta et al, 2010;Jackson, 2016).…”

Section: Introductionmentioning

confidence: 99%

2021 Tajogaite eruption records infiltration of crustal fluids within the upper mantle beneath La Palma, Canary Islands

Sandoval-Velasquez,

Casetta,

Ntaflos

et al. 2024

Front. Earth Sci.

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The 2021 Tajogaite eruption at La Palma has represented a unique opportunity to investigate the characteristics of the mantle source feeding modern volcanism in the Canary Islands. With the aim of track the fingerprint of carbon in the local oceanic lithosphere-asthenosphere system, we report the isotopic composition of CO2 (δ13C values versus Vienna Pee Dee Belemnite) in olivine- and clinopyroxene-hosted fluid inclusions (FI) from the 2021 Tajogaite lavas and from lavas/ultramafic xenoliths (olivine-clinopyroxenites, clinopyroxenites, dunites and harzburgites) from the nearby 1677 San Antonio eruption cone/lavas, in an attempt to characterize the origin and evolution of carbon within the local mantle source. Our results indicate that the 2021 and 1677 lavas exhibit δ13C values ranging from −4.94‰ to −2.71‰ and CO2/3He ratios from 3.37 to 6.14 × 109. Ultramafic xenoliths fall in a comparable range of values despite showing higher CO2 concentrations. Our δ13C values fall within the range of carbon isotope results previously reported for the Dos Aguas cold spring located in the Taburiente Caldera (northern La Palma), suggesting an apparent carbon isotope homogeneity at the scale of the entire island. The (relatively narrow) δ13C vs. CO2/3He ratio range of La Palma samples is interpreted to reflect either i) variable extents of open-system degassing of a common mantle endmember having δ13C of ∼1.7‰, or ii) mixing between depleted mantle-like carbon (−6‰ < δ13C < −4‰) and crustal carbon (δ13C = 0‰) endmembers. Both models testify a crustal carbon component recycled in the local mantle. This component, also detected in mantle xenoliths from the neighboring island of El Hierro and the easternmost Lanzarote, indicates a regional characteristic of the mantle beneath the Canary Islands, interpreted as a result of infiltration of carbon-rich melts during past metasomatic events in the local mantle.

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Simplifying Age Progressions within the Cook‐Austral Islands using ARGUS‐VI High‐Resolution ⁴⁰Ar/³⁹Ar Incremental Heating Ages

Cited by 19 publications

References 77 publications

Interpreting and reporting 40Ar/39Ar geochronologic data

Interpreting and reporting 40Ar/39Ar geochronologic data

Distinguishing Volcanic Contributions to the Overlapping Samoan and Cook-Austral Hotspot Tracks

2021 Tajogaite eruption records infiltration of crustal fluids within the upper mantle beneath La Palma, Canary Islands

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Simplifying Age Progressions within the Cook‐Austral Islands using ARGUS‐VI High‐Resolution 40Ar/39Ar Incremental Heating Ages

Cited by 19 publications

References 77 publications

Interpreting and reporting 40Ar/39Ar geochronologic data

Interpreting and reporting 40Ar/39Ar geochronologic data

Distinguishing Volcanic Contributions to the Overlapping Samoan and Cook-Austral Hotspot Tracks

2021 Tajogaite eruption records infiltration of crustal fluids within the upper mantle beneath La Palma, Canary Islands

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Simplifying Age Progressions within the Cook‐Austral Islands using ARGUS‐VI High‐Resolution ⁴⁰Ar/³⁹Ar Incremental Heating Ages