Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autorschaft

  • S. A. Silantyev
  • J. Koepke
  • A. A. Ariskin
  • M. O. Anosova
  • E. A. Krasnova
  • E. O. Dubinina
  • G. Suhr

Organisationseinheiten

Externe Organisationen

  • Russian Academy of Sciences (RAS)
  • Universität zu Köln
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Details

OriginalspracheEnglisch
Seiten (von - bis)109-127
Seitenumfang19
FachzeitschriftPetrology
Jahrgang22
Ausgabenummer2
PublikationsstatusVeröffentlicht - 6 März 2014

Abstract

Our newly obtained data on the geochemistry and age of plagiogranite-gabbronorite association in the oceanic core complex of the Mid-Atlantic Ridge (MAR) at 5°10′S suggest close genetic relations between these rocks in this segment of the ridge. The U/Pb zircon age of an oceanic plagiogranite (OPG) sample is 1.059 ± 0.055 Ma and is in good agreement with the zircon age of plutonic rocks in the oceanic core complex of northern MAR. A distinctive geochemical feature of the rocks is their unusually depleted 87Sr/86Sr and 143Nd/144Nd ratios, which suggest that the plutonic rocks of the gabbronorite-plagiogranite association in MAR at 5°10′S could be derived from the most strongly depleted mantle reservoir of all known to occur beneath the axial MAR zone. The COMAGMAT-5.2 numerical thermodynamic simulation of the possible crystallization links between the plagiogranite and gabbronorite from the MAR segment at 5°10′S led us to conclude that the leading role in the origin of the plagiogranite was played by a two-stage process: the partial melting of the gabbronorite and the subsequent fractionation of the newly generated melt. The regional differences between the isotopic-geochemical parameters of MAR plagiogranites can, perhaps, reflect local specifics of so-called hydrothermal anatexis, such as the geochemical features of the rocks involved in this process and the parameters of the hydrothermal process, for example, variations in the W/R ratio.

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Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S. / Silantyev, S. A.; Koepke, J.; Ariskin, A. A. et al.
in: Petrology, Jahrgang 22, Nr. 2, 06.03.2014, S. 109-127.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Silantyev, SA, Koepke, J, Ariskin, AA, Anosova, MO, Krasnova, EA, Dubinina, EO & Suhr, G 2014, 'Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S', Petrology, Jg. 22, Nr. 2, S. 109-127. https://doi.org/10.1134/S0869591114020064
Silantyev, S. A., Koepke, J., Ariskin, A. A., Anosova, M. O., Krasnova, E. A., Dubinina, E. O., & Suhr, G. (2014). Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S. Petrology, 22(2), 109-127. https://doi.org/10.1134/S0869591114020064
Silantyev SA, Koepke J, Ariskin AA, Anosova MO, Krasnova EA, Dubinina EO et al. Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S. Petrology. 2014 Mär 6;22(2):109-127. doi: 10.1134/S0869591114020064
Silantyev, S. A. ; Koepke, J. ; Ariskin, A. A. et al. / Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S. in: Petrology. 2014 ; Jahrgang 22, Nr. 2. S. 109-127.
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title = "Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S",
abstract = "Our newly obtained data on the geochemistry and age of plagiogranite-gabbronorite association in the oceanic core complex of the Mid-Atlantic Ridge (MAR) at 5°10′S suggest close genetic relations between these rocks in this segment of the ridge. The U/Pb zircon age of an oceanic plagiogranite (OPG) sample is 1.059 ± 0.055 Ma and is in good agreement with the zircon age of plutonic rocks in the oceanic core complex of northern MAR. A distinctive geochemical feature of the rocks is their unusually depleted 87Sr/86Sr and 143Nd/144Nd ratios, which suggest that the plutonic rocks of the gabbronorite-plagiogranite association in MAR at 5°10′S could be derived from the most strongly depleted mantle reservoir of all known to occur beneath the axial MAR zone. The COMAGMAT-5.2 numerical thermodynamic simulation of the possible crystallization links between the plagiogranite and gabbronorite from the MAR segment at 5°10′S led us to conclude that the leading role in the origin of the plagiogranite was played by a two-stage process: the partial melting of the gabbronorite and the subsequent fractionation of the newly generated melt. The regional differences between the isotopic-geochemical parameters of MAR plagiogranites can, perhaps, reflect local specifics of so-called hydrothermal anatexis, such as the geochemical features of the rocks involved in this process and the parameters of the hydrothermal process, for example, variations in the W/R ratio.",
author = "Silantyev, {S. A.} and J. Koepke and Ariskin, {A. A.} and Anosova, {M. O.} and Krasnova, {E. A.} and Dubinina, {E. O.} and G. Suhr",
note = "Funding Information: ACKNOWLEDGMENTS The authors thank the captain and crew of the R/V Atalante for help and cooperation in the course of the MARSDUED IV expedition. Consultations and assistance provided by Prof. Yu.A. Kostitsyn (Vernad sky Institute) made it possible to obtain reliable results and their realistic interpretations in the isotopic dating and studying the isotopic composition of our samples. The authors also thank Ya.V. Bychkova (Vernadsky Institute and the Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemis try) for ICP MS analyses of our rock samples. This study was financially supported by the Russian Foun dation for Basic Research (project no. 12 05 00002a), Program “Fundamental Problems of Oceanology: Physics, Geology, Biology, and Ecology” of the Pre sidium of the Russian Academy of Sciences (theme: “Mid Atlantic Ridge: Specifics of the Hydrothermal Interaction between the Ocean and Lithosphere and Ore Forming Processes”), Ministry of Education and Science of the Russian Federation (Government Con tract 11.519.11.5013), Grant DFG RFBR 08 05 91952 NNIOa, and Grant DFG 436RUS113/971/0 1.",
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TY - JOUR

T1 - Geochemical nature and age of the plagiogranite-gabbronorite association of the oceanic core complex of the Mid-Atlantic ridge at 5°10′S

AU - Silantyev, S. A.

AU - Koepke, J.

AU - Ariskin, A. A.

AU - Anosova, M. O.

AU - Krasnova, E. A.

AU - Dubinina, E. O.

AU - Suhr, G.

N1 - Funding Information: ACKNOWLEDGMENTS The authors thank the captain and crew of the R/V Atalante for help and cooperation in the course of the MARSDUED IV expedition. Consultations and assistance provided by Prof. Yu.A. Kostitsyn (Vernad sky Institute) made it possible to obtain reliable results and their realistic interpretations in the isotopic dating and studying the isotopic composition of our samples. The authors also thank Ya.V. Bychkova (Vernadsky Institute and the Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemis try) for ICP MS analyses of our rock samples. This study was financially supported by the Russian Foun dation for Basic Research (project no. 12 05 00002a), Program “Fundamental Problems of Oceanology: Physics, Geology, Biology, and Ecology” of the Pre sidium of the Russian Academy of Sciences (theme: “Mid Atlantic Ridge: Specifics of the Hydrothermal Interaction between the Ocean and Lithosphere and Ore Forming Processes”), Ministry of Education and Science of the Russian Federation (Government Con tract 11.519.11.5013), Grant DFG RFBR 08 05 91952 NNIOa, and Grant DFG 436RUS113/971/0 1.

PY - 2014/3/6

Y1 - 2014/3/6

N2 - Our newly obtained data on the geochemistry and age of plagiogranite-gabbronorite association in the oceanic core complex of the Mid-Atlantic Ridge (MAR) at 5°10′S suggest close genetic relations between these rocks in this segment of the ridge. The U/Pb zircon age of an oceanic plagiogranite (OPG) sample is 1.059 ± 0.055 Ma and is in good agreement with the zircon age of plutonic rocks in the oceanic core complex of northern MAR. A distinctive geochemical feature of the rocks is their unusually depleted 87Sr/86Sr and 143Nd/144Nd ratios, which suggest that the plutonic rocks of the gabbronorite-plagiogranite association in MAR at 5°10′S could be derived from the most strongly depleted mantle reservoir of all known to occur beneath the axial MAR zone. The COMAGMAT-5.2 numerical thermodynamic simulation of the possible crystallization links between the plagiogranite and gabbronorite from the MAR segment at 5°10′S led us to conclude that the leading role in the origin of the plagiogranite was played by a two-stage process: the partial melting of the gabbronorite and the subsequent fractionation of the newly generated melt. The regional differences between the isotopic-geochemical parameters of MAR plagiogranites can, perhaps, reflect local specifics of so-called hydrothermal anatexis, such as the geochemical features of the rocks involved in this process and the parameters of the hydrothermal process, for example, variations in the W/R ratio.

AB - Our newly obtained data on the geochemistry and age of plagiogranite-gabbronorite association in the oceanic core complex of the Mid-Atlantic Ridge (MAR) at 5°10′S suggest close genetic relations between these rocks in this segment of the ridge. The U/Pb zircon age of an oceanic plagiogranite (OPG) sample is 1.059 ± 0.055 Ma and is in good agreement with the zircon age of plutonic rocks in the oceanic core complex of northern MAR. A distinctive geochemical feature of the rocks is their unusually depleted 87Sr/86Sr and 143Nd/144Nd ratios, which suggest that the plutonic rocks of the gabbronorite-plagiogranite association in MAR at 5°10′S could be derived from the most strongly depleted mantle reservoir of all known to occur beneath the axial MAR zone. The COMAGMAT-5.2 numerical thermodynamic simulation of the possible crystallization links between the plagiogranite and gabbronorite from the MAR segment at 5°10′S led us to conclude that the leading role in the origin of the plagiogranite was played by a two-stage process: the partial melting of the gabbronorite and the subsequent fractionation of the newly generated melt. The regional differences between the isotopic-geochemical parameters of MAR plagiogranites can, perhaps, reflect local specifics of so-called hydrothermal anatexis, such as the geochemical features of the rocks involved in this process and the parameters of the hydrothermal process, for example, variations in the W/R ratio.

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