Peridotite and pyroxenite xenoliths from Tarim, NW China

Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt

Mi Mi Chen, Wei Tian, Katsuhiko Suzuki, M. L.G. Tejada, Feng Lin Liu, Ryoko Senda, Chun Jing Wei, Bin Chen, Zhu Yin Chu

研究成果: ジャーナルへの寄稿記事

17 引用 (Scopus)

抄録

Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (~17% fractional melting) and weak, incipient metasomatism. Group 2 and 3 peridotite xenoliths have undergone extensive silicate melt metasomatism, resulting in clinopyroxenes with spoon-shaped and highly fractionated REE patterns respectively. Although their present texture is metamorphic, the pyroxenite xenoliths were initially of metasomatic origin, with high pressure protolith mineral assemblage of orthopyroxene+clinopyroxene+spinel±olivine. Numerical modeling of the Mg-number shows that the Xikeer pyroxenites may have resulted from reaction between Group 1 peridotite and a primitive Permian picritic melt at a high melt/rock ratio (>15) and that the host basanite is incapable of being the metasomatic melt. The Re-Os isotopic systematics of the Xikeer peridotites and pyroxenites yield an apparent isochron of ~290Ma, virtually identical to the age of Tarim flood basalts. Their εNd(t=290Ma) ranges from +9.5 to +14.3, typical of convecting mantle. We propose that the Xikeer xenolith suite may have been initially formed by melt extraction from the convecting mantle and, shortly after, was refertilized by Tarim mantle plume melts during the Early Permian, a process which is referred to as mantle 'auto-refertilization'.

元の言語英語
ページ(範囲)97-111
ページ数15
ジャーナルLITHOS
204
DOI
出版物ステータス出版済み - 9 1 2014
外部発表Yes

Fingerprint

pyroxenite
flood basalt
mantle source
peridotite
melt
mantle
Silicates
Alkalies
Minerals
Melting
Textures
Rocks
metasomatism
spinel
Permian
basanite
xenolith
alkali basalt
silicate melt
mantle plume

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

これを引用

Peridotite and pyroxenite xenoliths from Tarim, NW China : Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt. / Chen, Mi Mi; Tian, Wei; Suzuki, Katsuhiko; Tejada, M. L.G.; Liu, Feng Lin; Senda, Ryoko; Wei, Chun Jing; Chen, Bin; Chu, Zhu Yin.

:: LITHOS, 巻 204, 01.09.2014, p. 97-111.

研究成果: ジャーナルへの寄稿記事

Chen, Mi Mi ; Tian, Wei ; Suzuki, Katsuhiko ; Tejada, M. L.G. ; Liu, Feng Lin ; Senda, Ryoko ; Wei, Chun Jing ; Chen, Bin ; Chu, Zhu Yin. / Peridotite and pyroxenite xenoliths from Tarim, NW China : Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt. :: LITHOS. 2014 ; 巻 204. pp. 97-111.
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title = "Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt",
abstract = "Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (~17{\%} fractional melting) and weak, incipient metasomatism. Group 2 and 3 peridotite xenoliths have undergone extensive silicate melt metasomatism, resulting in clinopyroxenes with spoon-shaped and highly fractionated REE patterns respectively. Although their present texture is metamorphic, the pyroxenite xenoliths were initially of metasomatic origin, with high pressure protolith mineral assemblage of orthopyroxene+clinopyroxene+spinel±olivine. Numerical modeling of the Mg-number shows that the Xikeer pyroxenites may have resulted from reaction between Group 1 peridotite and a primitive Permian picritic melt at a high melt/rock ratio (>15) and that the host basanite is incapable of being the metasomatic melt. The Re-Os isotopic systematics of the Xikeer peridotites and pyroxenites yield an apparent isochron of ~290Ma, virtually identical to the age of Tarim flood basalts. Their εNd(t=290Ma) ranges from +9.5 to +14.3, typical of convecting mantle. We propose that the Xikeer xenolith suite may have been initially formed by melt extraction from the convecting mantle and, shortly after, was refertilized by Tarim mantle plume melts during the Early Permian, a process which is referred to as mantle 'auto-refertilization'.",
author = "Chen, {Mi Mi} and Wei Tian and Katsuhiko Suzuki and Tejada, {M. L.G.} and Liu, {Feng Lin} and Ryoko Senda and Wei, {Chun Jing} and Bin Chen and Chu, {Zhu Yin}",
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T1 - Peridotite and pyroxenite xenoliths from Tarim, NW China

T2 - Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt

AU - Chen, Mi Mi

AU - Tian, Wei

AU - Suzuki, Katsuhiko

AU - Tejada, M. L.G.

AU - Liu, Feng Lin

AU - Senda, Ryoko

AU - Wei, Chun Jing

AU - Chen, Bin

AU - Chu, Zhu Yin

PY - 2014/9/1

Y1 - 2014/9/1

N2 - Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (~17% fractional melting) and weak, incipient metasomatism. Group 2 and 3 peridotite xenoliths have undergone extensive silicate melt metasomatism, resulting in clinopyroxenes with spoon-shaped and highly fractionated REE patterns respectively. Although their present texture is metamorphic, the pyroxenite xenoliths were initially of metasomatic origin, with high pressure protolith mineral assemblage of orthopyroxene+clinopyroxene+spinel±olivine. Numerical modeling of the Mg-number shows that the Xikeer pyroxenites may have resulted from reaction between Group 1 peridotite and a primitive Permian picritic melt at a high melt/rock ratio (>15) and that the host basanite is incapable of being the metasomatic melt. The Re-Os isotopic systematics of the Xikeer peridotites and pyroxenites yield an apparent isochron of ~290Ma, virtually identical to the age of Tarim flood basalts. Their εNd(t=290Ma) ranges from +9.5 to +14.3, typical of convecting mantle. We propose that the Xikeer xenolith suite may have been initially formed by melt extraction from the convecting mantle and, shortly after, was refertilized by Tarim mantle plume melts during the Early Permian, a process which is referred to as mantle 'auto-refertilization'.

AB - Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (~17% fractional melting) and weak, incipient metasomatism. Group 2 and 3 peridotite xenoliths have undergone extensive silicate melt metasomatism, resulting in clinopyroxenes with spoon-shaped and highly fractionated REE patterns respectively. Although their present texture is metamorphic, the pyroxenite xenoliths were initially of metasomatic origin, with high pressure protolith mineral assemblage of orthopyroxene+clinopyroxene+spinel±olivine. Numerical modeling of the Mg-number shows that the Xikeer pyroxenites may have resulted from reaction between Group 1 peridotite and a primitive Permian picritic melt at a high melt/rock ratio (>15) and that the host basanite is incapable of being the metasomatic melt. The Re-Os isotopic systematics of the Xikeer peridotites and pyroxenites yield an apparent isochron of ~290Ma, virtually identical to the age of Tarim flood basalts. Their εNd(t=290Ma) ranges from +9.5 to +14.3, typical of convecting mantle. We propose that the Xikeer xenolith suite may have been initially formed by melt extraction from the convecting mantle and, shortly after, was refertilized by Tarim mantle plume melts during the Early Permian, a process which is referred to as mantle 'auto-refertilization'.

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