Geochemistry of clinopyroxenes and petrogenesis of mantle xenoliths from Pliocene basanites of the Dzhilinda River: (Vitim volcanic field)

K. D. Litasov, Yu D. Litasov, A. S. Mekhonoshin, V. G. Mal'kovets

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Three series of peridotite xenoliths from basanites of the Dzhilinda River were analyzed. The trace-element patterns of clinopyroxenes of lherzolites of series 1 and 2a correspond to low-degree partial melting of the primitive mantle. Poikiloblastic harzburgites composed of minerals with low Mg# and characterized by a dome-like REE patterns in their relict clinopyroxene occur at the depth of garnet facies. Their origin is attributed to reworking of peridotites by percolated melt under high melt/matrix ratio (4-5%). Some peridotites of series 2a are characterized by a depleted composition and contain clinopyroxenes enriched in LREE and depleted in HFSE, which might be due to percolation of small portions of melt. We have established a rare type of interaction of melt with mantle substance producing high-Ti peridotites rich in pyroxenes and spinel (series 3). The high Ti content is indicative of the ilmenite-containing source. The high contents of Cr, Ni, Zn, and V suggest that dunite or harzburgite were initial rocks. The REE patterns in clinopyroxenes indicate a MORB-like composition of the coexisting melt. The Al-augite pyroxenites contain clinopyroxene with trace-element features pointing to their joint origin with low-temperature Cr-diopside pyroxenites. The trace-element patterns of the clinopyroxene megacrysts evidence their origin from fractional crystallization of alkaline basaltic or picrobasaltic melt. Shallow-depth skarn-like clinopyroxenites contain clinopyroxene whose REE pattern has a bend near Sm and show drastic enrichment in LREE. This suggests secondary transformation of rocks under the effect of fluid-rich melt, and these rocks were, probably, clinopyroxenite or gabbro with the primary characteristics of MORB.

Original languageEnglish
Pages (from-to)1557-1574
Number of pages18
JournalGeologiya i Geofizika
Volume41
Issue number11
Publication statusPublished - 2000
Externally publishedYes

Fingerprint

petrogenesis
Pliocene
geochemistry
melt
mantle
clinopyroxene
river
rare earth element
trace element
mid-ocean ridge basalt
rock
harzburgite
dunite
augite
skarn
diopside
ilmenite
reworking
fractional crystallization
gabbro

Keywords

  • Melt fractionation
  • Peridotites
  • Pyroxenites
  • Reactional percolation
  • Trace elements

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Geochemistry of clinopyroxenes and petrogenesis of mantle xenoliths from Pliocene basanites of the Dzhilinda River : (Vitim volcanic field). / Litasov, K. D.; Litasov, Yu D.; Mekhonoshin, A. S.; Mal'kovets, V. G.

In: Geologiya i Geofizika, Vol. 41, No. 11, 2000, p. 1557-1574.

Research output: Contribution to journalArticle

Litasov, K. D. ; Litasov, Yu D. ; Mekhonoshin, A. S. ; Mal'kovets, V. G. / Geochemistry of clinopyroxenes and petrogenesis of mantle xenoliths from Pliocene basanites of the Dzhilinda River : (Vitim volcanic field). In: Geologiya i Geofizika. 2000 ; Vol. 41, No. 11. pp. 1557-1574.
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AU - Litasov, Yu D.

AU - Mekhonoshin, A. S.

AU - Mal'kovets, V. G.

PY - 2000

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N2 - Three series of peridotite xenoliths from basanites of the Dzhilinda River were analyzed. The trace-element patterns of clinopyroxenes of lherzolites of series 1 and 2a correspond to low-degree partial melting of the primitive mantle. Poikiloblastic harzburgites composed of minerals with low Mg# and characterized by a dome-like REE patterns in their relict clinopyroxene occur at the depth of garnet facies. Their origin is attributed to reworking of peridotites by percolated melt under high melt/matrix ratio (4-5%). Some peridotites of series 2a are characterized by a depleted composition and contain clinopyroxenes enriched in LREE and depleted in HFSE, which might be due to percolation of small portions of melt. We have established a rare type of interaction of melt with mantle substance producing high-Ti peridotites rich in pyroxenes and spinel (series 3). The high Ti content is indicative of the ilmenite-containing source. The high contents of Cr, Ni, Zn, and V suggest that dunite or harzburgite were initial rocks. The REE patterns in clinopyroxenes indicate a MORB-like composition of the coexisting melt. The Al-augite pyroxenites contain clinopyroxene with trace-element features pointing to their joint origin with low-temperature Cr-diopside pyroxenites. The trace-element patterns of the clinopyroxene megacrysts evidence their origin from fractional crystallization of alkaline basaltic or picrobasaltic melt. Shallow-depth skarn-like clinopyroxenites contain clinopyroxene whose REE pattern has a bend near Sm and show drastic enrichment in LREE. This suggests secondary transformation of rocks under the effect of fluid-rich melt, and these rocks were, probably, clinopyroxenite or gabbro with the primary characteristics of MORB.

AB - Three series of peridotite xenoliths from basanites of the Dzhilinda River were analyzed. The trace-element patterns of clinopyroxenes of lherzolites of series 1 and 2a correspond to low-degree partial melting of the primitive mantle. Poikiloblastic harzburgites composed of minerals with low Mg# and characterized by a dome-like REE patterns in their relict clinopyroxene occur at the depth of garnet facies. Their origin is attributed to reworking of peridotites by percolated melt under high melt/matrix ratio (4-5%). Some peridotites of series 2a are characterized by a depleted composition and contain clinopyroxenes enriched in LREE and depleted in HFSE, which might be due to percolation of small portions of melt. We have established a rare type of interaction of melt with mantle substance producing high-Ti peridotites rich in pyroxenes and spinel (series 3). The high Ti content is indicative of the ilmenite-containing source. The high contents of Cr, Ni, Zn, and V suggest that dunite or harzburgite were initial rocks. The REE patterns in clinopyroxenes indicate a MORB-like composition of the coexisting melt. The Al-augite pyroxenites contain clinopyroxene with trace-element features pointing to their joint origin with low-temperature Cr-diopside pyroxenites. The trace-element patterns of the clinopyroxene megacrysts evidence their origin from fractional crystallization of alkaline basaltic or picrobasaltic melt. Shallow-depth skarn-like clinopyroxenites contain clinopyroxene whose REE pattern has a bend near Sm and show drastic enrichment in LREE. This suggests secondary transformation of rocks under the effect of fluid-rich melt, and these rocks were, probably, clinopyroxenite or gabbro with the primary characteristics of MORB.

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KW - Reactional percolation

KW - Trace elements

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