The rift-to-drift transition in the North Altantic: A stuttering start of the MORB machine?

Oliver Jagoutz; Othmar Müntener; Gianreto Manatschal; Daniela Rubatto; Gwenn Péron-Pinvidic; Brent D. Turrin; Igor M. Villa

doi:10.1130/G23613A.1

The rift-to-drift transition in the North Altantic: A stuttering start of the MORB machine?

Oliver Jagoutz^*, Othmar Müntener, Gianreto Manatschal, Daniela Rubatto, Gwenn Péron-Pinvidic, Brent D. Turrin, Igor M. Villa

^*Corresponding author for this work

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

137 Citations (Scopus)

Abstract

We report U-Pb and ³⁹Ar-⁴⁰Ar measurements on plutonic rocks recovered from the Ocean Drilling Program (ODP) Legs 173 and 210. Drilling revealed continental crust (Sites 1067 and 1069) and exhumed mantle (Sites 1070 and 1068) along the Iberia margin and exhumed mantle (Site 1277) on the conjugate Newfoundland margin. Our data record a complex igneous and thermal history related to the transition from rifting to seafloor spreading. The results show that the rift-to-drift transition is marked by a stuttering start of MORB-type magmatic activity. Subsequent to initial alkaline magmatism, localized mid-oceanic ridge basalts (MORB) magmatism was again replaced by basin-wide alkaline events, caused by a low degree of decompression melting due to tectonic delocalization of deformation. Such "off-axis" magmatism might be a common process in (ultra-) slow oceanic spreading systems, where "magmatic" and "tectonic" spreading varies in both space and time.

Original language	English
Pages (from-to)	1087-1090
Number of pages	4
Journal	Geology
Volume	35
Issue number	12
DOIs	https://doi.org/10.1130/G23613A.1
Publication status	Published - Dec 2007

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title = "The rift-to-drift transition in the North Altantic: A stuttering start of the MORB machine?",

abstract = "We report U-Pb and 39Ar-40Ar measurements on plutonic rocks recovered from the Ocean Drilling Program (ODP) Legs 173 and 210. Drilling revealed continental crust (Sites 1067 and 1069) and exhumed mantle (Sites 1070 and 1068) along the Iberia margin and exhumed mantle (Site 1277) on the conjugate Newfoundland margin. Our data record a complex igneous and thermal history related to the transition from rifting to seafloor spreading. The results show that the rift-to-drift transition is marked by a stuttering start of MORB-type magmatic activity. Subsequent to initial alkaline magmatism, localized mid-oceanic ridge basalts (MORB) magmatism was again replaced by basin-wide alkaline events, caused by a low degree of decompression melting due to tectonic delocalization of deformation. Such {"}off-axis{"} magmatism might be a common process in (ultra-) slow oceanic spreading systems, where {"}magmatic{"} and {"}tectonic{"} spreading varies in both space and time.",

keywords = "Age determinations, MORB, Magma-poor margins, Ocean-continent transition, Rifting",

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AU - Jagoutz, Oliver

AU - Müntener, Othmar

AU - Manatschal, Gianreto

AU - Rubatto, Daniela

AU - Péron-Pinvidic, Gwenn

AU - Turrin, Brent D.

AU - Villa, Igor M.

PY - 2007/12

Y1 - 2007/12

N2 - We report U-Pb and 39Ar-40Ar measurements on plutonic rocks recovered from the Ocean Drilling Program (ODP) Legs 173 and 210. Drilling revealed continental crust (Sites 1067 and 1069) and exhumed mantle (Sites 1070 and 1068) along the Iberia margin and exhumed mantle (Site 1277) on the conjugate Newfoundland margin. Our data record a complex igneous and thermal history related to the transition from rifting to seafloor spreading. The results show that the rift-to-drift transition is marked by a stuttering start of MORB-type magmatic activity. Subsequent to initial alkaline magmatism, localized mid-oceanic ridge basalts (MORB) magmatism was again replaced by basin-wide alkaline events, caused by a low degree of decompression melting due to tectonic delocalization of deformation. Such "off-axis" magmatism might be a common process in (ultra-) slow oceanic spreading systems, where "magmatic" and "tectonic" spreading varies in both space and time.

AB - We report U-Pb and 39Ar-40Ar measurements on plutonic rocks recovered from the Ocean Drilling Program (ODP) Legs 173 and 210. Drilling revealed continental crust (Sites 1067 and 1069) and exhumed mantle (Sites 1070 and 1068) along the Iberia margin and exhumed mantle (Site 1277) on the conjugate Newfoundland margin. Our data record a complex igneous and thermal history related to the transition from rifting to seafloor spreading. The results show that the rift-to-drift transition is marked by a stuttering start of MORB-type magmatic activity. Subsequent to initial alkaline magmatism, localized mid-oceanic ridge basalts (MORB) magmatism was again replaced by basin-wide alkaline events, caused by a low degree of decompression melting due to tectonic delocalization of deformation. Such "off-axis" magmatism might be a common process in (ultra-) slow oceanic spreading systems, where "magmatic" and "tectonic" spreading varies in both space and time.

KW - Age determinations

KW - MORB

KW - Magma-poor margins

KW - Ocean-continent transition

KW - Rifting

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DO - 10.1130/G23613A.1

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EP - 1090

JO - Geology

JF - Geology

IS - 12

ER -

The rift-to-drift transition in the North Altantic: A stuttering start of the MORB machine?

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