Remnants of Gondwanan continental lithosphere in oceanic upper mantle: Evidence from the South Atlantic Ridge

Vadim S. Kamenetsky; Roland Maas; Nadezhda M. Sushchevskaya; Marc D. Norman; Ian Cartwright; Alexander A. Peyve

doi:10.1130/0091-7613(2001)029<0243:ROGCLI>2.0.CO;2

Remnants of Gondwanan continental lithosphere in oceanic upper mantle: Evidence from the South Atlantic Ridge

Vadim S. Kamenetsky^*, Roland Maas, Nadezhda M. Sushchevskaya, Marc D. Norman, Ian Cartwright, Alexander A. Peyve

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

89 Citations (Scopus)

Abstract

Dredged glass from the southern Mid-Atlantic Ridge near the Bouvet Triple Junction has unique major element, trace element, and isotopic composition, distinct from typical mid-ocean ridge basalts. It is a high-Mg (Mg# 67.8), high-Ni (NiO 290 ppm) andesite depleted in highly incompatible and heavy rare-earth elements with an isotopic signature of ancient continental lithosphere (i.e., low ²⁰⁶Pb/²⁰⁴Pb and ¹⁴³Nd¹⁴⁴Nd and high ⁸⁷Sr/⁸⁶Sr and δ¹⁸O). The origin of this glass is attributed to melting of a Precambrian garnet bearing, mafic lithology, possibly related to lower crustal blocks stranded in the upper mantle during breakup of Gondwana and opening of the Atlantic. This composition can be used to explain anomalous geochemical features of oceanic rocks in the Southern Hemisphere.

Original language	English
Pages (from-to)	243-246
Number of pages	4
Journal	Geology
Volume	29
Issue number	3
DOIs	https://doi.org/10.1130/0091-7613(2001)029<0243:ROGCLI>2.0.CO;2
Publication status	Published - Mar 2001
Externally published	Yes

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@article{226dcd0ac15b43b2acc2b5e7c8001075,

title = "Remnants of Gondwanan continental lithosphere in oceanic upper mantle: Evidence from the South Atlantic Ridge",

abstract = "Dredged glass from the southern Mid-Atlantic Ridge near the Bouvet Triple Junction has unique major element, trace element, and isotopic composition, distinct from typical mid-ocean ridge basalts. It is a high-Mg (Mg# 67.8), high-Ni (NiO 290 ppm) andesite depleted in highly incompatible and heavy rare-earth elements with an isotopic signature of ancient continental lithosphere (i.e., low 206Pb/204Pb and 143Nd144Nd and high 87Sr/86Sr and δ18O). The origin of this glass is attributed to melting of a Precambrian garnet bearing, mafic lithology, possibly related to lower crustal blocks stranded in the upper mantle during breakup of Gondwana and opening of the Atlantic. This composition can be used to explain anomalous geochemical features of oceanic rocks in the Southern Hemisphere.",

keywords = "Gondwana, Isotopes, Mantle heterogeneities, Mid-ocean ridge basalts, South Atlantic, Subcontinental lithosphere",

author = "Kamenetsky, {Vadim S.} and Roland Maas and Sushchevskaya, {Nadezhda M.} and Norman, {Marc D.} and Ian Cartwright and Peyve, {Alexander A.}",

year = "2001",

month = mar,

doi = "10.1130/0091-7613(2001)029<0243:ROGCLI>2.0.CO;2",

language = "English",

volume = "29",

pages = "243--246",

journal = "Geology",

issn = "0091-7613",

publisher = "Geological Society of America",

number = "3",

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T1 - Remnants of Gondwanan continental lithosphere in oceanic upper mantle

T2 - Evidence from the South Atlantic Ridge

AU - Kamenetsky, Vadim S.

AU - Maas, Roland

AU - Sushchevskaya, Nadezhda M.

AU - Norman, Marc D.

AU - Cartwright, Ian

AU - Peyve, Alexander A.

PY - 2001/3

Y1 - 2001/3

N2 - Dredged glass from the southern Mid-Atlantic Ridge near the Bouvet Triple Junction has unique major element, trace element, and isotopic composition, distinct from typical mid-ocean ridge basalts. It is a high-Mg (Mg# 67.8), high-Ni (NiO 290 ppm) andesite depleted in highly incompatible and heavy rare-earth elements with an isotopic signature of ancient continental lithosphere (i.e., low 206Pb/204Pb and 143Nd144Nd and high 87Sr/86Sr and δ18O). The origin of this glass is attributed to melting of a Precambrian garnet bearing, mafic lithology, possibly related to lower crustal blocks stranded in the upper mantle during breakup of Gondwana and opening of the Atlantic. This composition can be used to explain anomalous geochemical features of oceanic rocks in the Southern Hemisphere.

AB - Dredged glass from the southern Mid-Atlantic Ridge near the Bouvet Triple Junction has unique major element, trace element, and isotopic composition, distinct from typical mid-ocean ridge basalts. It is a high-Mg (Mg# 67.8), high-Ni (NiO 290 ppm) andesite depleted in highly incompatible and heavy rare-earth elements with an isotopic signature of ancient continental lithosphere (i.e., low 206Pb/204Pb and 143Nd144Nd and high 87Sr/86Sr and δ18O). The origin of this glass is attributed to melting of a Precambrian garnet bearing, mafic lithology, possibly related to lower crustal blocks stranded in the upper mantle during breakup of Gondwana and opening of the Atlantic. This composition can be used to explain anomalous geochemical features of oceanic rocks in the Southern Hemisphere.

KW - Gondwana

KW - Isotopes

KW - Mantle heterogeneities

KW - Mid-ocean ridge basalts

KW - South Atlantic

KW - Subcontinental lithosphere

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U2 - 10.1130/0091-7613(2001)029<0243:ROGCLI>2.0.CO;2

DO - 10.1130/0091-7613(2001)029<0243:ROGCLI>2.0.CO;2

M3 - Article

SN - 0091-7613

VL - 29

SP - 243

EP - 246

JO - Geology

JF - Geology

IS - 3

ER -

Remnants of Gondwanan continental lithosphere in oceanic upper mantle: Evidence from the South Atlantic Ridge

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