ORCID Profile
0000-0002-8136-5372
Current Organisation
Oregon State University
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Publisher: Springer Science and Business Media LLC
Date: 12-11-2020
DOI: 10.1038/S41598-020-76691-1
Abstract: Extension of the Azores Plateau along the Terceira Rift exposes a lava sequence on the steep northern flank of the Hirondelle Basin. Unlike typical tholeiitic basalts of oceanic plateaus, the 1.2 km vertical submarine stratigraphic profile reveals two successive compositionally distinct basanitic to alkali basaltic eruptive units. The lower unit is volumetrically more extensive with ~ 1060 m of the crustal profile forming between ~ 2.02 and ~ 1.66 Ma, followed by a second unit erupting the uppermost ~ 30 m of lavas in ~ 100 kyrs. The age of ~ 1.56 Ma of the youngest in-situ s le at the top of the profile implies that the 35 km-wide Hirondelle Basin opened after this time along normal faults. This rifting phase was followed by alkaline volcanism at D. João de Castro seamount in the basin center indicating episodic volcanic activity along the Terceira Rift. The mantle source compositions of the two lava units change towards less radiogenic Nd, Hf, and Pb isotope ratios. A change to less SiO 2 -undersaturated magmas may indicate increasing degrees of partial melting beneath D. João de Castro seamount, possibly caused by lithospheric thinning within the past 1.5 million years. Our results suggest that rifting of oceanic lithosphere alternates between magmatically and tectonically dominated phases.
Publisher: American Geophysical Union (AGU)
Date: 10-2003
DOI: 10.1029/2003GC000533
Publisher: American Geophysical Union (AGU)
Date: 10-2013
DOI: 10.1002/GGGE.20267
Publisher: Springer Science and Business Media LLC
Date: 21-12-2012
DOI: 10.1038/NGEO1677
Publisher: American Geophysical Union (AGU)
Date: 09-2015
DOI: 10.1002/2015GC005966
Publisher: Springer Science and Business Media LLC
Date: 25-11-2012
DOI: 10.1038/NGEO1638
Publisher: American Geophysical Union (AGU)
Date: 12-2000
DOI: 10.1029/2000GC000108
Publisher: American Geophysical Union (AGU)
Date: 03-2015
DOI: 10.1002/2014JB011686
Publisher: Elsevier BV
Date: 05-2000
Publisher: American Geophysical Union (AGU)
Date: 05-2017
DOI: 10.1002/2016TC004461
Publisher: Springer Science and Business Media LLC
Date: 25-05-2021
Publisher: Geological Society of America
Date: 07-2020
DOI: 10.1130/B35560.1
Abstract: 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 subs les 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 s le. 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 micros led 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 ex les provide guidance for the presentation and interpretation of 40Ar/39Ar dates to maximize their interdisciplinary usage, reproducibility, and longevity.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 10-2009
Publisher: Elsevier BV
Date: 11-1998
Publisher: American Geophysical Union (AGU)
Date: 12-2014
DOI: 10.1002/2014GC005567
Publisher: Elsevier BV
Date: 04-2011
Publisher: American Geophysical Union (AGU)
Date: 06-2014
DOI: 10.1002/2014GC005288
Location: United States of America
No related grants have been discovered for Anthony Koppers.