Petit-spot lava fields off the central Chile trench induced by plate flexure

Hirano, Naoto; Machida, Shiki; Abe, Natsue; Morishita, Tomoaki; Tamura, Akihiro; Arai, Shoji

doi:10.2343/geochemj.2.0227

Cited by 41 publications

(25 citation statements)

References 30 publications

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“…(3) The lavas contain high concentrations of alkaline elements and are classified as potassic trachybasalt, shoshonite, and basanite (Hirano et al, 2006). We also observed these general geological and petrological features on petit-spot lavas from off the central Chile Trench, which were first reported by Hirano et al (2013).…”

Section: Introductionmentioning

confidence: 62%

“…Hirano et al (2008Hirano et al ( , 2013, Valentine and Hirano (2010), Uenzelmann-Neben et al (2012), and Taneja et al (2015) have shown that petit-spot volcanism is a phenomenon ubiquitous to plate flexure. Geochemical studies have revealed that alkaline basalt lava from petit-spot volcanoes has high concentrations of incompatible trace elements, indicating extreme enrichment in highly incompatible elements (e.g., Rb, Ba, U, Th, and Nb) and light rare earth elements (REEs), and depletion in heavy REEs (Hirano et al, 2006), and extreme Enriched Mantle 1 (EM-1)-like Sr-Nd-Pb isotopic compositions (Machida et al, 2009).…”

Section: Introductionmentioning

confidence: 98%

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Petit-spot geology reveals melts in upper-most asthenosphere dragged by lithosphere

Machida

Hirano

Sumino

et al. 2015

Earth and Planetary Science Letters

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 98%

Petit-spot geology reveals melts in upper-most asthenosphere dragged by lithosphere

Machida

Hirano

Sumino

et al. 2015

Earth and Planetary Science Letters

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“…Location of the subducted Papudo Seamount is from Yáñez et al (2001). Black box shows the area of the "petit spots" identified by Hirano et al (2013). The Easter Seamount Chain is also pointed out, along with the Challenger Fracture Zone.…”

Section: Ar/ 39 Ar Geochronologymentioning

confidence: 99%

40Ar/39Ar Geochronological Constraints on the Age Progression Along the Juan Fernández Ridge, SE Pacific

Lara¹,

Reyes

Jicha

et al. 2018

Front. Earth Sci.

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Juan Fernández Ridge (JFR) is a ca. 800 km long volcanic chain composed by seamounts, guyots and oceanic islands in the SE Pacific. JFR is thought to be related to a deep mantle plume and usually scores high in the hotspots catalogs (e.g., Anderson, 2005; Jackson et al., 2017). High 3 He/ 4 He in Robinson Crusoe is probably the most undoubted feature of lower mantle involvement. However, one of the most convincing pieces of evidence for a source rooted deep in the mantle is the age progression along a volcanic chain, which is poorly constrained for JFR. In fact, some scarce K-Ar dates in Alejandro Selkirk and Robinson Crusoe islands, and a total fusion age for O'Higgins Guyot published more than 20 years ago, is the only evidence available for such a hypothesis in previous works. Here we integrate recently published 40 Ar/ 39 Ar ages and 17 new results on groundmass step heating experiments from rocks corresponding to the late shield stage (O

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“…More recently, they have been reported on the Nazca plate off the coast of Chile (Hirano et al, 2013). They are believed to represent volcanism along fractures in the lithosphere formed by plate fl exure prior to subduction.…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide emission to Earth’s surface by deep-sea volcanism

Okumura¹,

Hirano²

2013

Geology

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Large amounts of CO 2 are transferred from Earth's interior to the surface by volcanism. On a geological time scale, the rate of CO 2 emission has controlled the evolution of Earth's atmosphere and climate, as well as the dynamic processes that take place in the mantle and core. The total rate of natural CO 2 emission from Earth has been estimated on the basis of CO 2 fl ux from arc, mid-ocean-ridge, and hotspot volcanism. However, previous estimates have overlooked the CO 2 emitted from a recently discovered type of volcanism-petit-spot volcanism-that occurs on the deep-sea fl oor. Here, we measure the CO 2 and H 2 O contents of glassy basalts produced by petit-spot volcanism and estimate the initial contents to be >5 wt% and 1.0-1.1 wt%, respectively. Based on these values and magma fl ux of petitspot volcanism, we show that the rate of CO 2 emission from petitspot volcanoes (2.7-5.4 × 10 11 g CO 2 yr -1 ) is a few percent of the CO 2 emissions from arc and mid-ocean-ridge volcanism, and up to ~14% of that from hotspot volcanism. Thus, the contribution to the carbon cycle on Earth of the large amounts of CO 2 that have been emitted from the deep-sea fl oor by petit-spot volcanism has not previously been recognized.

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Petit-spot lava fields off the central Chile trench induced by plate flexure

Cited by 41 publications

References 30 publications

Petit-spot geology reveals melts in upper-most asthenosphere dragged by lithosphere

Petit-spot geology reveals melts in upper-most asthenosphere dragged by lithosphere

40Ar/39Ar Geochronological Constraints on the Age Progression Along the Juan Fernández Ridge, SE Pacific

Carbon dioxide emission to Earth’s surface by deep-sea volcanism

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