Lithospheric Control on Asthenospheric Flow From the Iceland Plume: 3‐D Density Modeling of the Jan Mayen‐East Greenland Region, NE Atlantic

Tan, Pingchuan; Sippel, Judith; Breivik, A. J.; Meeßen, Christian; Scheck‐Wenderoth, Magdalena

doi:10.1029/2018jb015634

Cited by 11 publications

(25 citation statements)

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“…The correlation between sediment load corrected basement depth (excluding reactivated rough basement) and oceanic age shows that the depth of the spreading ridge at zero age is 1.65 km, and the seafloor subsidence rate is 300 m/Ma 1/2 (Figure c). The subsidence rate is the same as derived from the surrounding Greenland Basin (Figure ) (Tan et al, ) and comparable to results from other locations (320 m/Ma 1/2 Korenaga, ; 325 ± 20 m/Ma 1/2 , Crosby & McKenzie, ). The standard deviation of subsidence rate and zero‐age depth is 40 m/Ma 1/2 and 0.2 km using Morrison ().…”

Section: Discussionsupporting

confidence: 87%

“…The standard deviation of subsidence rate and zero-age depth is 40 m/Ma 1/2 and 0.2 km using Morrison (2014). However, the larger data set from the Greenland Basin from Tan et al (2018) gives the same subsidence rate but a standard deviation of ±15 m/Ma 1/2 . In addition, an uncertainty of 100 kg/m 3 in the average sediment density will affect zero-age seafloor depth by 0.05 km (Figure 11c).…”

Section: Logi Ridge Formation Age From Subsidencementioning

confidence: 91%

“…Seafloor age uncertainty is estimated to ±1 Ma, which corresponds to ±8 km with the spreading rate of Mohn's Ridge. The subsidence rate standard deviation of ±15 m/Ma 1/2 from Tan et al (2018) was used to test this parameter. For zero-age depths, we use the standard deviation of ±0.2 km.…”

Section: Sensitivity Analysis Of Dynamic Topography Estimatesmentioning

confidence: 99%

“…The shallow bathymetry could potentially be caused by a shallow hot asthenospheric flow from the Iceland plume along the Kolbeinsey Ridge and past the WJMFZ (e.g., Breivik et al, 2008;Hoggard et al, 2017). However, a recent 3D density modeling study shows that the shallowest part of the present-day Iceland plume flow is turning away from the northern tip of the Kolbeinsey Ridge and eastward to the southern tip of the Mohn's Ridge (Tan et al, 2018). Thus, the shallow bathymetry around the Logi Ridge appears to be tied to a deeper asthenospheric flow.…”

Section: Logi Ridge Origin and Dynamic Topography Developmentmentioning

confidence: 99%

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Dynamic Topography Development North of Iceland from Subaerial Exposure of the Igneous Logi Ridge, NE Atlantic

2019

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The Logi Ridge, located north of the West Jan Mayen Fracture Zone, is E-W oriented and 140-150 km long. The seafloor surrounding the Logi Ridge is ∼0.65 km shallower than the conjugate seafloor east of the Mohn's Ridge, attributed to asymmetry in the regional NE Atlantic dynamic uplift. Eight reflection seismic lines across the Logi Ridge constrain its development. Both the western and eastern parts have flat tops, indicating erosion at sea level. Three different basement types surrounding the Logi Ridge are observed: rough basement represents abyssal hills original or reactivated by later magmatic/tectonic events; smooth basement caused by basalt flows overprinting early sediments; and irregular basement formed by later basalt flows and intrusions. The surrounding sediments have two distinct units, where the unit boundary is Middle Miocene (12-14 Ma). Mass transport from the Logi Ridge appears episodically throughout Late Oligocene to Middle Miocene, when development ends. The end of erosion age can also be estimated from seamount height, or present top seamount depth. In the west there is agreement with the age constrained by the sedimentation, proving little dynamic topography change. In the east, discrepancies between the methods are explained by 0.15-0.3 km dynamic uplift after submergence. Hence, most of the regional dynamic uplift occurred before the end of the Logi Ridge development in the Middle Miocene, suggesting a causative relationship. Minor recent magmatic growth and seafloor uplift over a ∼100 km wide zone southeast of the Logi Ridge may be tied to the younger dynamic uplift in the east.

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Section: Discussionsupporting

confidence: 87%

Section: Logi Ridge Formation Age From Subsidencementioning

confidence: 91%

Section: Sensitivity Analysis Of Dynamic Topography Estimatesmentioning

confidence: 99%

Section: Logi Ridge Origin and Dynamic Topography Developmentmentioning

confidence: 99%

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Dynamic Topography Development North of Iceland from Subaerial Exposure of the Igneous Logi Ridge, NE Atlantic

2019

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“…It is commonly assumed that the density structure of oceanic upper mantle is controlled chiefly by ocean cooling, yet regional geochemical studies from ocean hot spots indicate significant compositional heterogeneity of the mantle melting source (Harrison et al, ; Korenaga & Kelemen, ; Simon et al, ; Widom, ). Regional gravity studies of the upper mantle are limited mostly to regions of continent‐ocean transition, where active seismic profiles provide information on the crustal structure (Maystrenko & Scheck‐Wenderoth, ; Tan et al, ).…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Shulgin

Artemieva

2019

JGR Solid Earth

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We present a new model, EUNA‐rho, for the density structure of the continental and oceanic upper mantle based on 3‐D tesseroid gravity modeling. On continent, there is no clear difference in lithospheric mantle (LM) density between the cratonic and Phanerozoic Europe, yet an ~300‐km‐wide zone of a high‐density LM along the Trans‐European Suture Zone may image a paleosubduction. Kimberlite provinces of the Baltica and Greenland cratons have a low‐density (3.32 g/cm3) mantle where all non‐damondiferous kimberlites tend to a higher‐density (3.34 g/cm3) anomalies. LM density correlates with the depth of sedimentary basins implying that mantle densification plays an important role in basin subsidence. A very dense (3.40–3.45 g/cm3) mantle beneath the superdeep platform basins and the East Barents shelf requires the presence of 10–20% of eclogite, while the West Barents Basin has LM density of 3.35 g/cm3 similar to the Variscan massifs of western Europe. In the North Atlantics, south of the Charlie Gibbs fracture zone (CGFZ) mantle density follows half‐space cooling model with significant deviations at volcanic provinces. North of the CGFZ, the entire North Atlantics is anomalous. Strong low‐density LM anomalies (< −3%) beneath the Azores and north of the CGFZ correlate with geochemical anomalies and indicate the presence of continental fragments and heterogeneous melting sources. Thermal anomalies in the upper mantle averaged down to the transition zone are 100–150 °C at the Azores and can be detected seismically, while a <50 °C anomaly around Iceland is at the limit of seismic resolution.

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Probabilistic linear inversion of satellite gravity gradient data applied to the northeast Atlantic

Minakov

Gaina

2021

Preprint

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Lateral density variations in Earth's structure are reflected in gravity data which can be used, together with other types of geological and geophysical information, to reveal Earth's structure. The well-known limitation of potential field data is the lack of information about the depth of structural heterogeneity. The gravity signal caused by individual lithospheric layers, such as sediments, crystalline crust, or mantle lithosphere, can be much larger than their sum (as well as the observed data) due to the isostatic compensation (e.g., Stacey and Davis (2008)). It follows that the lithospheric-scale gravity models directly reflect the type and accuracy of a priori information used as constraints.Regional or global crustal thickness models have been traditionally calculated by inverting gravity data which usually reflect variations in surface topography and Moho depth (Lebedeva-Ivanova et al., 2019;Reguzzoni & Sampietro, 2015;Wieczorek & Phillips, 1998). On the other hand, the gravity inversion can also be used to infer the top basement geometry given that the crustal thickness is constrained by seismic data and the region of interest is small enough, so that the contribution of mantle density anomalies can be ignored or removed assuming a certain model of isostatic compensation (e.g., Martinec & Fullea, 2015). In the case where the thickness of both sedimentary layers and the crystalline crust is constrained by seismic reflection and refraction data, the residual gravity signal can be computed from the observed gravity data and used to infer the distribution of density heterogeneity of the upper mantle (Kaban et al., 2010).In this study, we have chosen the northeast Atlantic region which is well covered by active-source seismic data, and where mantle density heterogeneities must be particularly strong. The uncertainty of a priori information is quantified in the form of the data covariance matrix. We address the problem of limited information on source depth by the following modifications applied to the standard 3-D gravity inversion approach (Li &

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Lithospheric Control on Asthenospheric Flow From the Iceland Plume: 3‐D Density Modeling of the Jan Mayen‐East Greenland Region, NE Atlantic

Cited by 11 publications

References 88 publications

Dynamic Topography Development North of Iceland from Subaerial Exposure of the Igneous Logi Ridge, NE Atlantic

Dynamic Topography Development North of Iceland from Subaerial Exposure of the Igneous Logi Ridge, NE Atlantic

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Probabilistic linear inversion of satellite gravity gradient data applied to the northeast Atlantic

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