3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic)
Unraveling the density structure of the oceanic lithosphere north of Iceland is key for understanding the effects of the Iceland Plume on the mid-ocean ridges of the greater Jan Mayen-East Greenland Region. We use a data-integrative approach for 3D gravity modeling to develop new insights into the c...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_2911902 2023-05-15T16:03:44+02:00 3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic) Tan, P. Sippel, J. Breivik, A. Scheck-Wenderoth, M. Meeßen, C. 2017 https://gfzpublic.gfz-potsdam.de/pubman/item/item_2911902 eng eng https://gfzpublic.gfz-potsdam.de/pubman/item/item_2911902 Abstracts info:eu-repo/semantics/conferenceObject 2017 ftgfzpotsdam 2022-09-14T05:55:13Z Unraveling the density structure of the oceanic lithosphere north of Iceland is key for understanding the effects of the Iceland Plume on the mid-ocean ridges of the greater Jan Mayen-East Greenland Region. We use a data-integrative approach for 3D gravity modeling to develop new insights into the crust and upper mantle density structure of this region. First, we obtain the 3D density structure of the sediments and crust from interpretations of regional reflection and refraction seismic lines. Then, the temperature and density structure of the mantle between 50 and 250 km are derived from a published shear-wave velocity (Vs) tomography model. To assess the density configuration between the Moho and 50 km depth, we follow a combined forward and inverse 3D gravity modeling approach. The Vs tomography and derived density of the deeper mantle (>50 km depth) reveal that the low-density anomaly related to the Iceland plume gets weaker with increasing distance from the plume, i.e. from the strongly influenced Middle Kolbeinsey Ridge (MKR) to the Mohn’s Ridge. The West Jan Mayen Fracture Zone is identified as a main mantle density contrast, indicative of differences in the thermal evolution of the ridge systems it separates. Beneath the MKR region, the low-density anomaly at depths of >50 km continues upwards into the uppermost mantle, where its lateral dimensions narrow considerably. This elongated density anomaly is consistent with a basement high and indicates a channelization of the Iceland plume effects. The NE-SW elongated mantle anomaly does not, however, coincide with the topographical NNE-SSW striking ridge axis. Thus, the modelled plume-affected oceanic lithosphere reveals discrepancies with the half-space cooling model. We discuss the 3D density model in terms of such spatial relations between deeper mantle anomalies and the shallow crustal structure. Conference Object East Greenland Greenland Iceland Jan Mayen Kolbeinsey GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Greenland Jan Mayen Kolbeinsey ENVELOPE(-18.687,-18.687,67.149,67.149) Kolbeinsey Ridge ENVELOPE(-16.917,-16.917,68.833,68.833) Jan Mayen Fracture Zone ENVELOPE(-8.000,-8.000,71.200,71.200) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Unraveling the density structure of the oceanic lithosphere north of Iceland is key for understanding the effects of the Iceland Plume on the mid-ocean ridges of the greater Jan Mayen-East Greenland Region. We use a data-integrative approach for 3D gravity modeling to develop new insights into the crust and upper mantle density structure of this region. First, we obtain the 3D density structure of the sediments and crust from interpretations of regional reflection and refraction seismic lines. Then, the temperature and density structure of the mantle between 50 and 250 km are derived from a published shear-wave velocity (Vs) tomography model. To assess the density configuration between the Moho and 50 km depth, we follow a combined forward and inverse 3D gravity modeling approach. The Vs tomography and derived density of the deeper mantle (>50 km depth) reveal that the low-density anomaly related to the Iceland plume gets weaker with increasing distance from the plume, i.e. from the strongly influenced Middle Kolbeinsey Ridge (MKR) to the Mohn’s Ridge. The West Jan Mayen Fracture Zone is identified as a main mantle density contrast, indicative of differences in the thermal evolution of the ridge systems it separates. Beneath the MKR region, the low-density anomaly at depths of >50 km continues upwards into the uppermost mantle, where its lateral dimensions narrow considerably. This elongated density anomaly is consistent with a basement high and indicates a channelization of the Iceland plume effects. The NE-SW elongated mantle anomaly does not, however, coincide with the topographical NNE-SSW striking ridge axis. Thus, the modelled plume-affected oceanic lithosphere reveals discrepancies with the half-space cooling model. We discuss the 3D density model in terms of such spatial relations between deeper mantle anomalies and the shallow crustal structure. |
format |
Conference Object |
author |
Tan, P. Sippel, J. Breivik, A. Scheck-Wenderoth, M. Meeßen, C. |
spellingShingle |
Tan, P. Sippel, J. Breivik, A. Scheck-Wenderoth, M. Meeßen, C. 3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic) |
author_facet |
Tan, P. Sippel, J. Breivik, A. Scheck-Wenderoth, M. Meeßen, C. |
author_sort |
Tan, P. |
title |
3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic) |
title_short |
3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic) |
title_full |
3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic) |
title_fullStr |
3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic) |
title_full_unstemmed |
3D Density Structure of Oceanic Lithosphere Affected by A Plume: A Case Study from the Greater Jan Mayen-East Greenland Region (NE Atlantic) |
title_sort |
3d density structure of oceanic lithosphere affected by a plume: a case study from the greater jan mayen-east greenland region (ne atlantic) |
publishDate |
2017 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_2911902 |
long_lat |
ENVELOPE(-18.687,-18.687,67.149,67.149) ENVELOPE(-16.917,-16.917,68.833,68.833) ENVELOPE(-8.000,-8.000,71.200,71.200) |
geographic |
Greenland Jan Mayen Kolbeinsey Kolbeinsey Ridge Jan Mayen Fracture Zone |
geographic_facet |
Greenland Jan Mayen Kolbeinsey Kolbeinsey Ridge Jan Mayen Fracture Zone |
genre |
East Greenland Greenland Iceland Jan Mayen Kolbeinsey |
genre_facet |
East Greenland Greenland Iceland Jan Mayen Kolbeinsey |
op_source |
Abstracts |
op_relation |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_2911902 |
_version_ |
1766399419391934464 |