Helium isotopes provide no evidence for deep mantle involvement in widespread Cenozoic volcanism across Central Asia

Barry, T. L.; Ivanov, Alexei V.; Rasskazov, S. V.; Demonterova, Е. I.; Dunai, Tibor J.; Davies, Gareth R.; Harrison, D.

doi:10.1016/j.lithos.2006.09.003

Cited by 47 publications

(30 citation statements)

References 44 publications

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“…BHVO-1 is Hawaiian basalt delivered by USGS as trace element standard. The plotted Ce/Pb of ∼ 15 and Sr/Pr of ∼ 70 for BHVO-1 are typical values obtained in our (e.g., Barry et al 2007; this study) and other laboratories (e.g., Dulski 2001). LCC is an average of the lower continental crust (Rudnick and Fountain 1995).…”

Section: Crystal Fractionation and Parental Low-ti Meltssupporting

confidence: 88%

Low-Ti melts from the southeastern Siberian Traps Large Igneous Province: Evidence for a water-rich mantle source?

et al. 2008

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Siberian Traps Large Igneous Province (STLIP) is one of the most voluminous volcanic provinces on Earth. The dominant erupted rocks are low-Ti basalts, which make up 80% by volume of the classical Noril'sk lava sequence. In the west Siberian basin and Maymecha-Kotuy area, the lowTi basalts make up about 99% and 50% by volume, respectively. Dolerite sills in the AngaraTaseevskaya Syncline at the southeastern STLIP exhibit trace element patterns and Sr isotope ratios typical of the low-Ti basalts of the Noril'sk sequence. The most Mg-rich (MgO 9.5-11 wt%) and hence least differentiated dolerites are characterized by trace element patterns with Ta-Nb depletion, low Ce/Pb and high Sr/Pr. These trace element features are similar to water-saturated, mantle wedge-derived island arc basalts. These imply an important role of subduction fluid-derived trace elements in the source of melting beneath the Angara-Taseevskaya Syncline and other regions of the STLIP. Less magnesium rocks (MgO 3.8-6.1 wt%) with less prominent Ta-Nb depletion, higher Ce/Pb and lower Sr/Pr could be produced via olivine-plagioclase fractionation of primary high-magnesium melts.

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Section: Crystal Fractionation and Parental Low-ti Meltssupporting

confidence: 88%

Low-Ti melts from the southeastern Siberian Traps Large Igneous Province: Evidence for a water-rich mantle source?

et al. 2008

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“…All the samples show prominent positive spikes for Ba, K, Pb and Sr in the primitive mantle normalized diagram ( Supplementary Fig. 5), a typical characteristic of hydrated mantle melts 6,20,27,28 .…”

Section: Hydration Of the Mtz By Stagnant Pacific Slab Central-eastmentioning

confidence: 97%

“…3a,c). Crustal materials are generally characterized by high SiO 2 contents and high La/Sm, but low Sm/Nd, ratios, whereas asthenospheric mantle-derived melts generally have typical mantle oxygen isotopes (olivine d 3 He/ 4 He ratios shows that they are similar to melts generated in the shallow mantle, but significantly lower than those generated in the primordial lower mantle 28 . The lack of lower mantle-rooted low-velocity seismic structure 21 , the alkalic nature of the dominant phase and no evidence for pre-eruption uplift 34 argue strongly against a deep plume origin for the OIB-like endmember melt 35 .…”

Section: Hydration Of the Mtz By Stagnant Pacific Slab Central-eastmentioning

confidence: 99%

Continental flood basalts derived from the hydrous mantle transition zone

et al. 2015

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“…2). The new authors and published (Yarmolyuk et al 2003a) are plotted more abundant compared to hawaiites, but trace elements and radiogenic isotopes (when available) suggest that the volcanic rocks in the whole region are akin to each other (e.g., Barry et al 2007;Johnson et al 2005). Differences in major elements have been attributed to different depths of melt extraction from the peridotitic mantle, controlled by the thickness of lithospheric blocks of different ages ) and thinning of the lithosphere due to the Baikal rifting episode (Ivanov and Demonterova 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Some authors believe that a lower mantle plume is necessary (Yarmolyuk et al 2003b;Savatenkov et al 2010), whereas other authors limit the depths of the source of the magmatism to the mantle transition zone (Zorin et al 2006) or shallower mantle (Barry et al 2007;Rasskazov et al 1997Rasskazov et al , 2002. Two seismic tomography experiments were conducted in Central Asia (e.g., Gao et al 1994;Barruol et al 2008), but they were of insufficient resolution to detect plumes if such exist at depths below the mantle transition zone.…”

Section: Discussionmentioning

confidence: 99%

Jom-Bolok Holocene volcanic field in the East Sayan Mts., Siberia, Russia: structure, style of eruptions, magma compositions, and radiocarbon dating

et al. 2011

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Jom-Bolok volcanic field is located in the East Sayan Mts. of Siberia (Russia), a portion of the Asian convergent zone. It is located at the boundary of the Riphean Tuva-Mongolia massif, which was probably reactivated because of the interplay between far-field tectonic stress derived from the India-Asia collision zone and extension in the south-western Baikal rift system. The volcanic field comprises a number of hawaiitic lava flows, of various lengths, which flowed down paleorivers. Flows were fed by fissure eruptions and the largest lava flow field was dated as 7,130±140 cal 14 C years BP using a buried organic sample found inside the associated cinder cone. This lava flow field is about 70 km long, ∼100 km 2 in area, and 7.9 km 3 in volume. The area and volume of this flow field ranks this eruption highly in the global record of fissure-fed effusive eruptions. This lava flow field makes up 97% of the entire Jom-Bolok volcanic field, a fact which raises a puzzling question: why and/or how did a relatively small-volume volcanic field produce such a large-volume individual eruption? A working hypothesis is that a pond of sublithospheric melt accumulated over a relatively prolonged period. This was then rapidly drained in response of tectonic changes triggered by unloading of ice in the Early Holocene.

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Helium isotopes provide no evidence for deep mantle involvement in widespread Cenozoic volcanism across Central Asia

Cited by 47 publications

References 44 publications

Low-Ti melts from the southeastern Siberian Traps Large Igneous Province: Evidence for a water-rich mantle source?

Low-Ti melts from the southeastern Siberian Traps Large Igneous Province: Evidence for a water-rich mantle source?

Continental flood basalts derived from the hydrous mantle transition zone

Jom-Bolok Holocene volcanic field in the East Sayan Mts., Siberia, Russia: structure, style of eruptions, magma compositions, and radiocarbon dating

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