Superplume metasomatism: Evidence from Siberian mantle xenoliths

Howarth, Geoffrey H.; Barry, Peter H.; Pernet‐Fisher, J. F.; Baziotis, Ioannis; Pokhilenko, N. P.; Pokhilenko, L. N.; Bodnar, Robert J.; Taylor, L. A.; Agashev, A. M.

doi:10.1016/j.lithos.2013.09.006

Cited by 119 publications

(72 citation statements)

References 61 publications

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“…The highest pressure values for ilmenites, rare garnets and clinopyroxenes are close to 7.5 GPa. It is possible that the mantle lithosphere in this region was thicker before the PermianeTriassic heating as was suggested in previous works (Griffin et al, 2005;O'Reilly and Griffin, 2010;Howarth et al, 2014).…”

Section: Ptxf(o 2 ) Conditions Beneath Kharamai Field and Prianabariesupporting

confidence: 57%

“…But the layering shows more contrast in the MaloBotuobinsky field. Some pipes in the Kuoyka field such as Obnazhennaya (Taylor et al, 2003;Ashchepkov et al, 2010Ashchepkov et al, , 2013aHowarth et al, 2014), which has also very depleted lower SCLM part and thick pyroxenite layer, reveal a very similar SCLM structure but belong to the Khapchan terrane.…”

Section: Structure Of Mantle Sections and Tectonic Implicationsmentioning

confidence: 99%

“…Nevertheless using pressure estimates for garnets (Ryan et al, 1996) it was assumed that the lower part of the lithospheric mantle in the northern part of Siberian craton was delaminated (Griffin et al, 2005) after the Siberian PermianeTriassic superplume event. However recent work suggests that it was only slightly reduced, mainly in Jurassic time (Howarth et al, 2014).…”

Section: Introductionmentioning

confidence: 96%

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Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

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a b s t r a c tMantle xenocrysts from early Triassic kimberlite pipes from Kharamai, Ary-Mastakh and Kuranakh fields in the Anabar shield of Siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere mantle (SCLM). Pressure-temperature (PT) reconstructions using monomineral thermobarometry for 5 phases show division of the SCLM beneath the Kharamai field into 6 units: pyroxenitic Fe-rich (1e2 GPa) and Mg-rich (2e3 GPa) layers; middle with two levels of Gar-Sp pyroxenites at w3 and 4e5 GPa; Gar-duniteeharzburgites w4.5e6.5 GPa subjected to Ilm-Px vein metasomatism; and a Mg-rich dunite lower part. In the Anabar shield (Ary-Mastakh, Dyuken and Kuranakh fields) mantle lithosphere is composed of three large units divided into two parts: upper part with amphiboles and phlogopite; two levels of pyroxenites and eclogites at 3 and 4 GPa, and a lower part composed of refertilized dunites. Diagrams showing P-Fe # Gar clusters for garnets and omphacites illustrate the differences between SCLM of these localities. Differences of Triassic SCLM from Devonian SCLM are in simple layering; abundance of Na-Cr-amphiboles and metasomatism in the upper SCLM part, thick pyroxenite-eclogite layer and lower part depletion, heated from SCLM base to 5.0 GPa.Kharamai mantle clinopyroxenes represent three geochemical types: (1) harzburgitic with inclined linear REE, HFSE troughs and elevated Th, U; (2) lherzolitic or pyroxenitic with round TRE patterns and decreasing incompatible elements; (3) eclogitic with Eu troughs, Pb peak and high LILE content. Calculated parental melts for garnets with humped REE patterns suggest dissolution of former Cpx and depression means Cpx and garnets extraction. Clinopyroxenes from Ary-Mastakh fields show less inclined REE patterns with HMREE troughs and an increase of incompatible elements. Clinopyroxenes from Kuranakh field show flatter spoon-like REE patterns and peaks in Ba, U, Pb and Sr, similar to those in ophiolitic harzburgites. The PT diagrams for the mantle sections show high temperature gradients in the uppermost SCLM accompanied by an increase of P-Fe # Ol upward and slightly reduced thickness of the mantle keel of the Siberian craton, resulting from the influence of the PermianeTriassic superplume, but with no signs of delamination.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Ptxf(o 2 ) Conditions Beneath Kharamai Field and Prianabariesupporting

confidence: 57%

Section: Structure Of Mantle Sections and Tectonic Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

View full text Add to dashboard Cite

show abstract

“…Thus, we see no particular reason to attribute all or the majority of the metasomatic overprints recorded in Obnazhennaya peridotites to Phanerozoic events, e.g. hypothetical lithospheric erosion by the mantle plume responsible for Siberian flood basalt volcanism as advocated by Howarth et al (2014).…”

Section: Age Estimates For the Lithospheric Mantle Beneath Obnazhennayamentioning

confidence: 75%

“…Very little data on peridotite xenoliths from Obnazhennaya are available in the international literature. Taylor et al (2003) and Howarth et al (2014) reported major and trace element analyses of minerals from 15 olivine-bearing xenoliths with a P-T range (including data on eclogites and pyroxenites) of 1.4-4.2 GPa and 620-1100 • C. Pernet-Fisher et al (2015) reported PGE and Re-Os data for two xenoliths as well as for olivine separated from six samples, but no modal or bulk chemical compositions for any of these xenoliths.…”

Section: Geologic Setting and Mantle Xenolithsmentioning

confidence: 99%