The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin
New Sr–Nd–Pb–Hf data require the existence of at least four mantle components in the genesis of basalts from the North Atlantic Igneous Province (NAIP): (1) one (or more likely a small range of) enriched component(s) within the Iceland plume, (2) a depleted component within the Iceland plume (distin...
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ftsouthampton:oai:eprints.soton.ac.uk:8812 2023-07-30T04:03:56+02:00 The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin Kempton, P.D. Fitton, J.G. Saunders, A.D. Nowell, G.M. Taylor, R.N. Hardarson, B.S. Pearson, G. 2000 https://eprints.soton.ac.uk/8812/ unknown Kempton, P.D., Fitton, J.G., Saunders, A.D., Nowell, G.M., Taylor, R.N., Hardarson, B.S. and Pearson, G. (2000) The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin. Earth and Planetary Science Letters, 177 (3/4), 255-271. (doi:10.1016/S0012-821X(00)00047-9 <http://dx.doi.org/10.1016/S0012-821X(00)00047-9>). Article PeerReviewed 2000 ftsouthampton https://doi.org/10.1016/S0012-821X(00)00047-9 2023-07-09T20:29:36Z New Sr–Nd–Pb–Hf data require the existence of at least four mantle components in the genesis of basalts from the North Atlantic Igneous Province (NAIP): (1) one (or more likely a small range of) enriched component(s) within the Iceland plume, (2) a depleted component within the Iceland plume (distinct from the shallow N-MORB source), (3) a depleted sheath surrounding the plume and (4) shallow N-MORB source mantle. These components have been available since the major phase of igneous activity associated with plume head impact during Paleogene times. In Hf–Nd isotope space, samples from Iceland, DSDP Leg 49 (Sites 407, 408 and 409), ODP Legs 152 and 163 (southeast Greenland margin), the Reykjanes Ridge, Kolbeinsey Ridge and DSDP Leg 38 (Site 348) define fields that are oblique to the main ocean island basalt array and extend toward a component with higher 176 Hf/ 177 Hf than the N-MORB source available prior to arrival of the plume, as indicated by the compositions of Cretaceous basalts from Goban Spur (~95 Ma). Aside from Goban Spur, only basalts from Hatton Bank on the oceanward side of the Rockall Plateau (DSDP Leg 81) lie consistently within the field of N-MORB, which indicates that the compositional influence of the plume did not reach this far south and east ~55 Ma ago. Thus, Hf–Nd isotope systematics are consistent with previous studies which indicate that shallow MORB-source mantle does not represent the depleted component within the Iceland plume [Thirlwall, J. Geol. Soc. London 152 (1995) 991–996; Hards et al., J. Geol. Soc. London 152 (1995) 1003–1009; Fitton et al., Earth Planet. Sci. Lett. 153 (1997) 197–208]. They also indicate that the depleted component is a long-lived and intrinsic feature of the Iceland plume, generated during an ancient melting event in which a mineral (such as garnet) with a high Lu/Hf was a residual phase. Collectively, these data suggest a model for the Iceland plume in which a heterogeneous core, derived from the lower mantle, consists of ‘enriched’ streaks or blobs ... Article in Journal/Newspaper Greenland Iceland Kolbeinsey North Atlantic Ocean Island University of Southampton: e-Prints Soton Greenland Hatton Bank ENVELOPE(-18.000,-18.000,58.583,58.583) Kolbeinsey ENVELOPE(-18.687,-18.687,67.149,67.149) Kolbeinsey Ridge ENVELOPE(-16.917,-16.917,68.833,68.833) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Rockall Plateau ENVELOPE(-18.833,-18.833,56.333,56.333) Earth and Planetary Science Letters 177 3-4 255 271 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
unknown |
description |
New Sr–Nd–Pb–Hf data require the existence of at least four mantle components in the genesis of basalts from the North Atlantic Igneous Province (NAIP): (1) one (or more likely a small range of) enriched component(s) within the Iceland plume, (2) a depleted component within the Iceland plume (distinct from the shallow N-MORB source), (3) a depleted sheath surrounding the plume and (4) shallow N-MORB source mantle. These components have been available since the major phase of igneous activity associated with plume head impact during Paleogene times. In Hf–Nd isotope space, samples from Iceland, DSDP Leg 49 (Sites 407, 408 and 409), ODP Legs 152 and 163 (southeast Greenland margin), the Reykjanes Ridge, Kolbeinsey Ridge and DSDP Leg 38 (Site 348) define fields that are oblique to the main ocean island basalt array and extend toward a component with higher 176 Hf/ 177 Hf than the N-MORB source available prior to arrival of the plume, as indicated by the compositions of Cretaceous basalts from Goban Spur (~95 Ma). Aside from Goban Spur, only basalts from Hatton Bank on the oceanward side of the Rockall Plateau (DSDP Leg 81) lie consistently within the field of N-MORB, which indicates that the compositional influence of the plume did not reach this far south and east ~55 Ma ago. Thus, Hf–Nd isotope systematics are consistent with previous studies which indicate that shallow MORB-source mantle does not represent the depleted component within the Iceland plume [Thirlwall, J. Geol. Soc. London 152 (1995) 991–996; Hards et al., J. Geol. Soc. London 152 (1995) 1003–1009; Fitton et al., Earth Planet. Sci. Lett. 153 (1997) 197–208]. They also indicate that the depleted component is a long-lived and intrinsic feature of the Iceland plume, generated during an ancient melting event in which a mineral (such as garnet) with a high Lu/Hf was a residual phase. Collectively, these data suggest a model for the Iceland plume in which a heterogeneous core, derived from the lower mantle, consists of ‘enriched’ streaks or blobs ... |
format |
Article in Journal/Newspaper |
author |
Kempton, P.D. Fitton, J.G. Saunders, A.D. Nowell, G.M. Taylor, R.N. Hardarson, B.S. Pearson, G. |
spellingShingle |
Kempton, P.D. Fitton, J.G. Saunders, A.D. Nowell, G.M. Taylor, R.N. Hardarson, B.S. Pearson, G. The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin |
author_facet |
Kempton, P.D. Fitton, J.G. Saunders, A.D. Nowell, G.M. Taylor, R.N. Hardarson, B.S. Pearson, G. |
author_sort |
Kempton, P.D. |
title |
The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin |
title_short |
The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin |
title_full |
The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin |
title_fullStr |
The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin |
title_full_unstemmed |
The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin |
title_sort |
iceland plume in space and time: a sr-nd-pb-hf study of the north atlantic rifted margin |
publishDate |
2000 |
url |
https://eprints.soton.ac.uk/8812/ |
long_lat |
ENVELOPE(-18.000,-18.000,58.583,58.583) ENVELOPE(-18.687,-18.687,67.149,67.149) ENVELOPE(-16.917,-16.917,68.833,68.833) ENVELOPE(-22.250,-22.250,65.467,65.467) ENVELOPE(-18.833,-18.833,56.333,56.333) |
geographic |
Greenland Hatton Bank Kolbeinsey Kolbeinsey Ridge Reykjanes Rockall Plateau |
geographic_facet |
Greenland Hatton Bank Kolbeinsey Kolbeinsey Ridge Reykjanes Rockall Plateau |
genre |
Greenland Iceland Kolbeinsey North Atlantic Ocean Island |
genre_facet |
Greenland Iceland Kolbeinsey North Atlantic Ocean Island |
op_relation |
Kempton, P.D., Fitton, J.G., Saunders, A.D., Nowell, G.M., Taylor, R.N., Hardarson, B.S. and Pearson, G. (2000) The Iceland plume in space and time: a Sr-Nd-Pb-Hf study of the North Atlantic rifted margin. Earth and Planetary Science Letters, 177 (3/4), 255-271. (doi:10.1016/S0012-821X(00)00047-9 <http://dx.doi.org/10.1016/S0012-821X(00)00047-9>). |
op_doi |
https://doi.org/10.1016/S0012-821X(00)00047-9 |
container_title |
Earth and Planetary Science Letters |
container_volume |
177 |
container_issue |
3-4 |
container_start_page |
255 |
op_container_end_page |
271 |
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1772815077449138176 |