Petrogenesis of Cenozoic Basalts from Mongolia: Evidence for the Role of Asthenospheric versus Metasomatized Lithospheric Mantle Sources

Barry, T. L.; Saunders, A. D.; Kempton, Pamela D.; Windley, Brian F.; Pringle, Malcolm S.; Dorjnamjaa, D.; Saandar, S.

doi:10.1093/petrology/44.1.55

Cited by 205 publications

(158 citation statements)

References 108 publications

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“…With proximity to the Baikal rift, tectonic forces have significantly shaped the landscape. Active volcanism is well documented in Central and Northern Mongolia with basaltic vents and flows occurring between 30 million to circa 8,000 years ago (Barry et al 2003;Chuvashova et al 2007;Harris et al, 2010).…”

Section: Geographical Settingmentioning

confidence: 99%

The open-air site of Tolbor 16 (Northern Mongolia): Preliminary results and perspectives

Zwyns

Gladyshev

Gunchinsuren

et al. 2014

Quaternary International

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Section: Geographical Settingmentioning

confidence: 99%

The open-air site of Tolbor 16 (Northern Mongolia): Preliminary results and perspectives

Zwyns

Gladyshev

Gunchinsuren

et al. 2014

Quaternary International

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“…Studied basic-intermediate rocks show wide range of Ce/Pb ratios (15-41) much more similar to mantle (ratios for most mantle compositions are ~25 and primitive mantle ~9; Hofmann et al 1986) than to the crustal compositions (Ce/Pb < 5). On the other hand, La/Nb ratios (1.5-3.7) are higher than in Cenozoic Mongolian basalts (Barry et al 2003) (Fig. 7b), providing an evidence for crustal contamination (La/Nb ~1.5 for upper crust and ~4.5 lower crust; Taylor and McLennan 1985).…”

Section: Discussionmentioning

confidence: 93%

“…7a), which is a feature typical also of younger Mongolian basalts (Barry et al 2003). For the basaltic samples, the time-integrated shift in the Sr isotopic value can be considered as negligible due to low Rb/Sr values (0.01-0.03).…”

Section: Discussionmentioning

confidence: 99%

“…b -Primitive-mantle normalized trace-element multielement diagram (Sun and McDonough 1989). Field for Cenozoic basalts from Mongolia (Barry et al 2003) is shown for comparison. The primitive-mantle normalised spider diagram (Fig 5b) shows strong enrichment in LIL elements; negative anomalies in Rb and Nb are also characteristic.…”

Section: Whole-rock Geochemistry and Sr-nd Isotopic Compositionsmentioning

confidence: 99%

“…Within-plate magmatic activity in the southwestern Mongolia started during Mesozoic and culminated in the Cenozoic (Barry et al 2003). The majority of the Late Mesozoic volcanic rocks tend to be localised within the Gobi-Altay rift (Yarmolyuk 1986).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Early Cretaceous volcanic activity in the western part of the Gobi-Altay rift (Shiliin Nuruu, SW Mongolia)

Buriánek¹,

Hanžl²,

Erban³

et al. 2012

J. Geosci.

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The Cretaceous continental sedimentation in SW Mongolia was commonly accompanied by volcanic activity. Bimodal association of the Cretaceous Khulsan Gol Formation is represented mostly by calc-alkaline and rare alkaline volcanic rocks (basaltic andesite, trachybasalt to trachyandesite lavas or tuffs with lahars). The lavas were extruded mainly subaerially, although locally there is a subaqueous component present corresponding to final phases of Mesozoic sedimentation in the Gobi-Altay rift zone. Variations in chemical and isotopic composition reflect crustal assimilation coupled with fractional crystallization of parental magma generated by melting of lower lithosphere and/or uppermost asthenospheric mantle. These within-plate volcanic rocks can be explained as initial stages of Cenozoic magmatic activity in the Mongolia.

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Integrated geophysical-petrological modeling of lithosphere-asthenosphere boundary in central Tibet using electromagnetic and seismic data

Vozár

Jones

Fullea

et al. 2014

Geochem. Geophys. Geosyst.

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We undertake a petrologically driven approach to jointly model magnetotelluric (MT) and seismic surface wave dispersion (SW) data from central Tibet, constrained by topographic height. The approach derives realistic temperature and pressure distributions within the upper mantle and characterizes mineral assemblages of given bulk chemical compositions as well as water content. This allows us to define a bulk geophysical model of the upper mantle based on laboratory and xenolith data for the most relevant mantle mineral assemblages and to derive corresponding predicted geophysical observables. One-dimensional deep resistivity models were derived for two groups of MT stations. One group, located in the Lhasa Terrane, shows the existence of an electrically conductive upper mantle layer and shallower conductive upper mantle layer for the other group, located in the Qiangtang Terrane. The subsequent one-dimensional integrated petrological-geophysical modeling suggests a lithosphere-asthenosphere boundary (LAB) at a depth of 80-120 km with a dry lithosphere for the Qiangtang Terrane. In contrast, for the Lhasa Terrane the LAB is located at about 180 km but the presence of a small amount of water in the lithospheric mantle (<0.02 wt%) is required to fit the longest period MT responses. Our results suggest two different lithospheric configurations beneath the southern and central Tibetan Plateau. The model for the Lhasa Terrane implies underthrusting of a moderately wet Indian plate. The model for the Qiangtang Terrane shows relatively thick and conductive crust and implies thin and dry Tibetan lithosphere.

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Petrogenesis of Cenozoic Basalts from Mongolia: Evidence for the Role of Asthenospheric versus Metasomatized Lithospheric Mantle Sources

Abstract: mantle; however, there is no evidence to suggest a high heat flux Diffuse Cenozoic volcanism in Mongolia forms part of a widespread mantle plume. Volcanism is likely to occur where localized extensional tectono-magmatic province that extends from NE China to Lake conditions are favourable.

Cited by 205 publications

References 108 publications

The open-air site of Tolbor 16 (Northern Mongolia): Preliminary results and perspectives

The open-air site of Tolbor 16 (Northern Mongolia): Preliminary results and perspectives

The Early Cretaceous volcanic activity in the western part of the Gobi-Altay rift (Shiliin Nuruu, SW Mongolia)

Integrated geophysical-petrological modeling of lithosphere-asthenosphere boundary in central Tibet using electromagnetic and seismic data

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