Two contrasting lithologies in off-rift subcontinental lithospheric mantle beneath central Europec-the Krzeniów (SW Poland) case study

Magdalena Matusiak-Malek; Jacek Puziewicz; Theodoros Ntaflos; Michel Gregoire; Mathieu Benoit; Andreas Kluegel

doi:10.1093/petrology/egu042

Two contrasting lithologies in off-rift subcontinental lithospheric mantle beneath central Europec-the Krzeniów (SW Poland) case study

Magdalena Matusiak-Malek
, Jacek Puziewicz
, Theodoros Ntaflos
, Michel Gregoire
, Mathieu Benoit
, Andreas Kluegel

Department of Lithospheric Research

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

Miocene basanite from Krzeniów (SW Poland, eastern part of Cenozoic Central European Volcanic Province) contains scarce, small (usually <4 cm in diameter) spinel harzburgite and dunite mantle xenoliths. Two groups are defined based on the forsterite (Fo) content in olivine: group A (Fo _90.4-91.7) and group B (Fo _88.0-89.8). Both group A and B rocks are either clinopyroxenefree or clinopyroxene-poor. The group A orthopyroxene (mg# 0.91-0.92) is Al-poor and strongly light rare earth element (LREE) depleted [(La/Lu) _N<0.42]. The mg# of group A clinopyroxene varies from 0.92 to 0.94 and is negatively correlated with its Al content. The trace element compositions of clinopyroxene define two patterns: A1, U-shaped [(La/Lu) _N=20.23-64.73]; A2, almost linear LREE enriched [(La/Lu) _N=11.91-14.00]. The group B orthopyroxene is also Al poor and LREE depleted [(La/Lu) _N=0.03-0.04], but its mg# is lower than that in group A orthopyroxene (0.90-0.92).The mg# of group B clinopyroxene (0.90-0.92) is lower than that in group A, whereas theAl content is similar. The REE patterns of group B clinopyroxene mimic those of subgroup A2 [(La/Lu) _N=5.64-11.30]. The group A harzburgites and dunites represent spinel-facies lithospheric mantle that underwent metasomatism by CO ₂-bearing silicate melts subjected to chromatographic fractionation. Locally carbonatite-silicate immiscible melts were generated. The peridotites in the distal parts of the chromatographic system were little affected by metasomatism and preserve much of their pre-metasomatic, depleted characteristics. The group B rocks are similar to those of group A except for the lower mg# of orthopyroxene and olivine. They were affected by percolating alkaline silicate melt undersaturated in clinopyroxene, which lowered the mg# of the olivine and orthopyroxene ('Fe metasomatism'). The A and B peridotites are representative of the Miocene lithospheric mantle close to the margins of the neighbouring Eger Rift.

Original language	English
Article number	egu042
Pages (from-to)	1799-1828
Number of pages	30
Journal	Journal of Petrology
Volume	55
Issue number	9
DOIs	https://doi.org/10.1093/petrology/egu042
Publication status	Published - Sept 2014

Funding

This study is a part of the project of National Centre for Scientific Research (DEC-2011/03/B/ST10/06248; funding awarded to M.M.-M.). The isotope data were collected thanks to an award from project 'Iuventus Plus' of the Polish Ministry of Science and Education to M.M.-M. The analytical work was supported by joint 2008-2009 and 2010-2011 projects in the frame of Austrian Polish scientific and cultural co-operation agreement (Institute of Geological Sciences University of Wroclaw and Department of Lithospheric Sciences, University of Vienna) and project POLONIUM 2009-2010 (Institute of Geological Sciences, University of Wroclaw and Midi-Pyrenees Observatory, University Paul Sabatier, Toulouse).

Austrian Fields of Science 2012

105105 Geochemistry
105120 Petrology

Keywords

lithospheric mantle
carbonatie
metasomalism
slicate melt
Central European Volcanic Province
ND ISOTOPIC GEOCHEMISTRY
LITHOSPHERIC MANTLE
PERIDOTITE XENOLITHS
TRACE-ELEMENT
REFRACTORY MANTLE
MELT PERCOLATION
MULTISTAGE METASOMATISM
ABYSSAL PERIDOTITES
SPINEL PERIDOTITE
TERTIARY BASALTS
Silicate melt
Carbonatite metasomatism
Central European volcanic province
Lithospheric mantle

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10.1093/petrology/egu042

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@article{736497b13f5d4864b758f1669ac8ae08,

title = "Two contrasting lithologies in off-rift subcontinental lithospheric mantle beneath central Europec-the Krzeni{\'o}w (SW Poland) case study",

abstract = "Miocene basanite from Krzeni{\'o}w (SW Poland, eastern part of Cenozoic Central European Volcanic Province) contains scarce, small (usually <4 cm in diameter) spinel harzburgite and dunite mantle xenoliths. Two groups are defined based on the forsterite (Fo) content in olivine: group A (Fo 90.4-91.7) and group B (Fo 88.0-89.8). Both group A and B rocks are either clinopyroxenefree or clinopyroxene-poor. The group A orthopyroxene (mg\# 0.91-0.92) is Al-poor and strongly light rare earth element (LREE) depleted [(La/Lu) N<0.42]. The mg\# of group A clinopyroxene varies from 0.92 to 0.94 and is negatively correlated with its Al content. The trace element compositions of clinopyroxene define two patterns: A1, U-shaped [(La/Lu) N=20.23-64.73]; A2, almost linear LREE enriched [(La/Lu) N=11.91-14.00]. The group B orthopyroxene is also Al poor and LREE depleted [(La/Lu) N=0.03-0.04], but its mg\# is lower than that in group A orthopyroxene (0.90-0.92).The mg\# of group B clinopyroxene (0.90-0.92) is lower than that in group A, whereas theAl content is similar. The REE patterns of group B clinopyroxene mimic those of subgroup A2 [(La/Lu) N=5.64-11.30]. The group A harzburgites and dunites represent spinel-facies lithospheric mantle that underwent metasomatism by CO 2-bearing silicate melts subjected to chromatographic fractionation. Locally carbonatite-silicate immiscible melts were generated. The peridotites in the distal parts of the chromatographic system were little affected by metasomatism and preserve much of their pre-metasomatic, depleted characteristics. The group B rocks are similar to those of group A except for the lower mg\# of orthopyroxene and olivine. They were affected by percolating alkaline silicate melt undersaturated in clinopyroxene, which lowered the mg\# of the olivine and orthopyroxene ('Fe metasomatism'). The A and B peridotites are representative of the Miocene lithospheric mantle close to the margins of the neighbouring Eger Rift.",

keywords = "lithospheric mantle, carbonatie, metasomalism, slicate melt, Central European Volcanic Province, ND ISOTOPIC GEOCHEMISTRY, LITHOSPHERIC MANTLE, PERIDOTITE XENOLITHS, TRACE-ELEMENT, REFRACTORY MANTLE, MELT PERCOLATION, MULTISTAGE METASOMATISM, ABYSSAL PERIDOTITES, SPINEL PERIDOTITE, TERTIARY BASALTS, Silicate melt, Carbonatite metasomatism, Central European volcanic province, Lithospheric mantle, MANTLE PERIDOTITES, Mantle metasomatism, xenolith",

author = "Magdalena Matusiak-Malek and Jacek Puziewicz and Theodoros Ntaflos and Michel Gregoire and Mathieu Benoit and Andreas Kluegel",

note = "Funding Information: This study is a part of the project of National Centre for Scientific Research (DEC-2011/03/B/ST10/06248; funding awarded to M.M.-M.). The isotope data were collected thanks to an award from project {\textquoteleft}Iuventus Plus{\textquoteright} of the Polish Ministry of Science and Education to M.M.-M. The analytical work was supported by joint 2008\textasciicircum{}2009 and 2010\textasciicircum{}2011 projects in the frame of Austrian\textasciicircum{}Polish scientific and cultural co-operation agreement (Institute of Geological Sciences University of Wroclaw and Department of Lithospheric Sciences, University of Vienna) and project POLONIUM 2009\textasciicircum{}2010 (Institute of Geological Sciences, University of Wroclaw and Midi-Pyrenees Observatory, University Paul Sabatier, Toulouse).",

year = "2014",

month = sep,

doi = "10.1093/petrology/egu042",

language = "English",

volume = "55",

pages = "1799--1828",

journal = "Journal of Petrology",

issn = "0022-3530",

publisher = "OXFORD UNIV PRESS",

number = "9",

}

TY - JOUR

T1 - Two contrasting lithologies in off-rift subcontinental lithospheric mantle beneath central Europec-the Krzeniów (SW Poland) case study

AU - Matusiak-Malek, Magdalena

AU - Puziewicz, Jacek

AU - Ntaflos, Theodoros

AU - Gregoire, Michel

AU - Benoit, Mathieu

AU - Kluegel, Andreas

N1 - Funding Information: This study is a part of the project of National Centre for Scientific Research (DEC-2011/03/B/ST10/06248; funding awarded to M.M.-M.). The isotope data were collected thanks to an award from project ‘Iuventus Plus’ of the Polish Ministry of Science and Education to M.M.-M. The analytical work was supported by joint 2008^2009 and 2010^2011 projects in the frame of Austrian^Polish scientific and cultural co-operation agreement (Institute of Geological Sciences University of Wroclaw and Department of Lithospheric Sciences, University of Vienna) and project POLONIUM 2009^2010 (Institute of Geological Sciences, University of Wroclaw and Midi-Pyrenees Observatory, University Paul Sabatier, Toulouse).

PY - 2014/9

Y1 - 2014/9

N2 - Miocene basanite from Krzeniów (SW Poland, eastern part of Cenozoic Central European Volcanic Province) contains scarce, small (usually <4 cm in diameter) spinel harzburgite and dunite mantle xenoliths. Two groups are defined based on the forsterite (Fo) content in olivine: group A (Fo 90.4-91.7) and group B (Fo 88.0-89.8). Both group A and B rocks are either clinopyroxenefree or clinopyroxene-poor. The group A orthopyroxene (mg# 0.91-0.92) is Al-poor and strongly light rare earth element (LREE) depleted [(La/Lu) N<0.42]. The mg# of group A clinopyroxene varies from 0.92 to 0.94 and is negatively correlated with its Al content. The trace element compositions of clinopyroxene define two patterns: A1, U-shaped [(La/Lu) N=20.23-64.73]; A2, almost linear LREE enriched [(La/Lu) N=11.91-14.00]. The group B orthopyroxene is also Al poor and LREE depleted [(La/Lu) N=0.03-0.04], but its mg# is lower than that in group A orthopyroxene (0.90-0.92).The mg# of group B clinopyroxene (0.90-0.92) is lower than that in group A, whereas theAl content is similar. The REE patterns of group B clinopyroxene mimic those of subgroup A2 [(La/Lu) N=5.64-11.30]. The group A harzburgites and dunites represent spinel-facies lithospheric mantle that underwent metasomatism by CO 2-bearing silicate melts subjected to chromatographic fractionation. Locally carbonatite-silicate immiscible melts were generated. The peridotites in the distal parts of the chromatographic system were little affected by metasomatism and preserve much of their pre-metasomatic, depleted characteristics. The group B rocks are similar to those of group A except for the lower mg# of orthopyroxene and olivine. They were affected by percolating alkaline silicate melt undersaturated in clinopyroxene, which lowered the mg# of the olivine and orthopyroxene ('Fe metasomatism'). The A and B peridotites are representative of the Miocene lithospheric mantle close to the margins of the neighbouring Eger Rift.

AB - Miocene basanite from Krzeniów (SW Poland, eastern part of Cenozoic Central European Volcanic Province) contains scarce, small (usually <4 cm in diameter) spinel harzburgite and dunite mantle xenoliths. Two groups are defined based on the forsterite (Fo) content in olivine: group A (Fo 90.4-91.7) and group B (Fo 88.0-89.8). Both group A and B rocks are either clinopyroxenefree or clinopyroxene-poor. The group A orthopyroxene (mg# 0.91-0.92) is Al-poor and strongly light rare earth element (LREE) depleted [(La/Lu) N<0.42]. The mg# of group A clinopyroxene varies from 0.92 to 0.94 and is negatively correlated with its Al content. The trace element compositions of clinopyroxene define two patterns: A1, U-shaped [(La/Lu) N=20.23-64.73]; A2, almost linear LREE enriched [(La/Lu) N=11.91-14.00]. The group B orthopyroxene is also Al poor and LREE depleted [(La/Lu) N=0.03-0.04], but its mg# is lower than that in group A orthopyroxene (0.90-0.92).The mg# of group B clinopyroxene (0.90-0.92) is lower than that in group A, whereas theAl content is similar. The REE patterns of group B clinopyroxene mimic those of subgroup A2 [(La/Lu) N=5.64-11.30]. The group A harzburgites and dunites represent spinel-facies lithospheric mantle that underwent metasomatism by CO 2-bearing silicate melts subjected to chromatographic fractionation. Locally carbonatite-silicate immiscible melts were generated. The peridotites in the distal parts of the chromatographic system were little affected by metasomatism and preserve much of their pre-metasomatic, depleted characteristics. The group B rocks are similar to those of group A except for the lower mg# of orthopyroxene and olivine. They were affected by percolating alkaline silicate melt undersaturated in clinopyroxene, which lowered the mg# of the olivine and orthopyroxene ('Fe metasomatism'). The A and B peridotites are representative of the Miocene lithospheric mantle close to the margins of the neighbouring Eger Rift.

KW - lithospheric mantle

KW - carbonatie

KW - metasomalism

KW - slicate melt

KW - Central European Volcanic Province

KW - ND ISOTOPIC GEOCHEMISTRY

KW - LITHOSPHERIC MANTLE

KW - PERIDOTITE XENOLITHS

KW - TRACE-ELEMENT

KW - REFRACTORY MANTLE

KW - MELT PERCOLATION

KW - MULTISTAGE METASOMATISM

KW - ABYSSAL PERIDOTITES

KW - SPINEL PERIDOTITE

KW - TERTIARY BASALTS

KW - Silicate melt

KW - Carbonatite metasomatism

KW - Central European volcanic province

KW - Lithospheric mantle

KW - MANTLE PERIDOTITES

KW - Mantle metasomatism

KW - xenolith

UR - https://www.scopus.com/pages/publications/84906877573

U2 - 10.1093/petrology/egu042

DO - 10.1093/petrology/egu042

M3 - Article

SN - 0022-3530

VL - 55

SP - 1799

EP - 1828

JO - Journal of Petrology

JF - Journal of Petrology

IS - 9

M1 - egu042

ER -

Two contrasting lithologies in off-rift subcontinental lithospheric mantle beneath central Europec-the Krzeniów (SW Poland) case study

Abstract

Funding

Austrian Fields of Science 2012

Keywords

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