Basalt lava flows of the intraplate Newer Volcanic Province in south-east Australia (Melbourne region): 40Ar/39Ar geochronology reveals ~8 Ma of episodic activity

Geochemical and Chronological Constraints on the Origin and Mantle Source of Early Cretaceous Arc Volcanism on the Gagua Ridge in Western Pacific

“…Volcanic groundmass aliquots of samples GR‐7‐1 and GR‐7‐23, analyzed in addition to plagioclase, produced significantly younger ages (∼70–90 Ma; Table S2 in Supporting Information ). Plagioclase is a common rock‐forming mineral and relatively resistant to seafloor alteration, and 40 Ar/ 39 Ar age‐dating of plagioclase grains often yields reliable rock‐forming ages (Heath et al., 2020; Schaen et al., 2021). The groundmass material contains a range of minerals, including plagioclase, but is typically far more susceptible to seawater alteration.…”

Divergent lineages in a semi‐arid mallee species, Eucalyptus behriana, correspond to a major geographic break in southeastern Australia

“…The clay soils prone to water‐logging that develop on the basalt plain predominately support open, grassy ecosystems (Barlow & Ross, 2001) and the basalt flows partially surround Long Forest aside from the north where the GDR represents exposed parts of the Castlemaine Group. It is possible that it was these volcanic events that isolated the Long Forest population, however, the most recent flows (<0.1 Mya) are to the south of the Long Forest area, with many of the flows that surround Long Forest being closer to 2 Myr old (Heath et al., 2020). This date would seem too old to be the initial cause of the isolation of the Long Forest population given the lack of morphological and genetic differentiation of this population, and the fact that such an old isolation would also infer that the deeper genetic disjunction across the Lower Murray Basin was on the order of several million years.…”

“…The clay soils prone to water-logging that develop on the basalt plain predominately support open, grassy ecosystems (Barlow & Ross, 2001) and the basalt flows partially surround Long Forest aside from the north where the GDR represents exposed parts of the Castlemaine Group. It is possible that it was these volcanic events that isolated the Long Forest population, however, the most recent flows (<0.1 Mya) are to the south of the Long Forest area, with many of the flows that surround Long Forest being closer to 2 Myr old (Heath et al, 2020).…”

Spatio-temporal forecasting of future volcanism at Harrat Khaybar, Saudi Arabia

“…These volcanic fields are usually referred to as "monogenetic", as every new eruption typically occurs at a new location. Distributed volcanic fields can be found in every tectonic environment, and many active or potentially active fields are within or near large population centers such as Auckland Volcanic Field (Auckland, New Zealand), Newer Volcanics Province (Melbourne, Australia), Boring Volcanic Field (Portland, Oregon), and Chichinautzin volcanic field (Mexico City, Mexico) (Evarts et al 2009;Nieto-Torres and Martin Del Pozzo 2019;Heath et al 2020;Hopkins et al 2020). Given their longevity, variable eruptive style, and uncertain spatial patterns, understanding the volcanic hazard associated with distributed volcanic fields is an ongoing challenge (e.g., Bebbington and Cronin 2011;Connor et al 2012;El Difrawy et al 2013;Becerril et al 2014Becerril et al , 2017Bertin et al 2019), which relies upon comprehensive estimations of both the location and the timing of the next eruptive event.…”