Petrology of the Northern East Greenland Tertiary Flood Basalts: Evidence from Hold with Hope and Wollaston Forland

Upton, B. G. J.; Emeleus, C. H.; Beckinsale, R. D.

doi:10.1093/petrology/25.1.151

Cited by 55 publications

(48 citation statements)

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“…We note strong compositional affinities between the upper series at Site 642 and the lower plateau lava series (LPLS, Fig. 10) at Hold With Hope and Wollaston Foreland (Upton et al, 1984;Viereck et al, this volume). An equivalent of the upper plateau lava series (UPLS, Fig.…”

Section: Vtfring Plateau Emplacement Modelmentioning

confidence: 73%

“…In view of the Site 642 results we have modified the emplacement model for the northern East Greenland basalts proposed by Upton et al (1984). We suggest that the LPLS and its submarine extension, together with the Vo'ring Plateau upper series, were mainly emplaced after the time of breakup (Fig.…”

Section: Vtfring Plateau Emplacement Modelmentioning

confidence: 96%

“…Tholeiitic sills, mostly relating to LPLS, are abundant in adjacent Cretaceous and lower Tertiary sediments. The lower basalts are dominantly quartz tholeiites, relatively depleted in incompatible elements (Upton et al, 1984). The upper plateau lava series (UPLS) are thinner and reflect smaller eruption rates.…”

Section: East Greenlandmentioning

confidence: 99%

“…These aphyric to porphyric flows are mainly enriched olivine tholeiites, with some alkali basalts. According to Upton et al (1984), LPLS was emplaced through very thin continental crust during late rifting; whereas UPLS, feeding from a relatively deep mantle source, was extruded from a large shield volcano on the rift margin in the early spreading stage. There is no precise dating of the onset of volcanism; however, Hald (1978) describes a reversed magnetic polarity in LPLS, changing to normal at the base to lower part of the UPLS.…”

Section: East Greenlandmentioning

confidence: 99%

See 3 more Smart Citations

Evolution of the Vøring Volcanic Margin

Eldholm¹,

Thiede²,

Taylor³

1989

Proceedings of the Ocean Drilling Program

136

107

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ODP Sites 642 and 643 recovered a succession of rocks which have greatly improved the understanding of how the Cenozoic volcanic Wring Margin evolved, particularly by providing important constraints on the series of events that occurred during the initial opening of the Norwegian-Greenland Sea. The more than 900 m of igneous rocks and interbedded sediments drilled at Site 642 constitute two distinct, strikingly different volcanic series. The upper series, composed of transitional mid-oceanic tholeiitic lava flows and thin interbedded volcaniclastic sediments confirmed the seaward-dipping reflectors to be a terrestrially constructed extrusive complex. The lower series, probably extending for several hundred meters below the bottom of the hole, consists of another flow complex of dacitic composition, some dikes and thicker interbedded sediments, partially continentally derived. We suggest that the margin evolved by crustal extension in the Paleocene accompanied by uplift and a progressively more intense invasion of dikes and sills in the rift zone. Just prior to breakup, magma from shallow crustal melts produced the lower series. The upper series was constructed during an intense, rapidly waning, volcanic surge of subaerial accretion of oceanic magma following breakup in middle of Chron 24.2R. The surge is characterized by a much increased rate of magma production and high spreading rate. The upper series cover both newly formed oceanic crust and large areas of the adjacent thinned continental crust. The dipping wedge was formed by subsidence due to loading and thermal contraction, possibly amplified by a tectonic force. When the surge had abated, the injection center quickly subsided and normal oceanic crust was formed. Our interpretation is that the continent/ocean boundary occurs at the seaward termination of reflector K, which separates the two volcanic series. However, a region of strongly intruded transitional crust is inferred in 30-to 50-km wide zones on either side of the Vdring Plateau Escarpment.The Wring Margin experienced crustal uplift and extension prior to breakup, restricted to a Tertiary marginal basin west of the present shelf edge. The initial volcanic surge and shallow extrusion level are related to a higher than normal temperature at the base of the lithosphere, inducing partial melting combined with opening in previously thinned crust. The commonly described non-extensional nature of this margin is only an apparent phenomenon. Except for the outer basin, extension by dike injection coupled with high strength of the thin, pre-opening crust in the Vdring Basin precluded the formation of a faulted rift unconformity. We believe these observations have relevance for volcanic margins elsewhere, but infer that seaward-dipping reflectors can form in many environments.The Wring Plateau marginal high and other similar features in the North Atlantic are an integrated part of the North Atlantic Volcanic Province, which extends 2000 km longitudinally. Compared to the central, transverse, part of ...

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Section: Vtfring Plateau Emplacement Modelmentioning

confidence: 73%

Section: Vtfring Plateau Emplacement Modelmentioning

confidence: 96%

Section: East Greenlandmentioning

confidence: 99%

Section: East Greenlandmentioning

confidence: 99%

See 2 more Smart Citations

Evolution of the Vøring Volcanic Margin

Eldholm¹,

Thiede²,

Taylor³

1989

Proceedings of the Ocean Drilling Program

136

107

View full text Add to dashboard Cite

show abstract

“…Clague et al (1980), Evans and Wright (1972), Hawkins and Melchior (1983), Wilkinson and Hensel (1988); Other intraplate tholeiites, Gunn etal. (1970), Krishnamurthy and Cox (1977), Upton et al (1984); Setogawa meta-picrite, Ishida et al (1990); Loihi dunites, Clague (1988); Koolau dunites, Sen and Presnall (1986); Tahiti dunite, Tracy (1980); Takashima dunites, Arai and Kobayashi (unpublished).…”

Section: Some Applicationsmentioning

confidence: 99%

Chemistry of chromian spinel in volcanic rocks as a potential guide to magma chemistry

1992

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Chromian spinel in volcanic rocks is a potential discriminant for magma chemistry. The TiO2 content of spinel, compared at similar Fe3+/(Cr + A1 + Fe 3+) ratios, can distinguish island arc basalts from intraplate basalts. MORB spinels are low in this ratio and are intermediate for the TiOe level at comparable Fe 3+ ratios. Spinels from back-arc basin basalts, although similar in TiO2/Fe 3+ ratio, are more enriched in Fe 3+ than the MORB spinels. Spinels in the oceanic plateau basalts are distinctly lower in TiO2 than other intraplate basalt spinels and even slightly lower in TiOa than the MORB spinels. The data were successfully applied to estimate the kind of the magma from which spinelbearing cumulates, especially dunites, were formed. Original magma chemistry of altered or metamorphosed volcanics in which spinels survive can also be estimated by the chemistry of relict spinel alone. It is possible to estimate the magma type of source volcanics for detrital spinel particles of volcanic derivation.K E Yw o RI~ s : chromian spinel, TiO2 content, MORB, island-arc basalt and andesite, intraplate basalt, magma chemistry.

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Sill and lava geochemistry of the mid‐Norway and NE Greenland conjugate margins

Neumann

Svensen

Tegner

et al. 2013

Geochem Geophys Geosyst

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[1] This paper presents major, trace-elements, and Sr-Nd isotopes for two prominent sills formed during the opening of the North Atlantic, sampled by the Utgard borehole (6607/5-2) in the Vïring Plateau. The Utgard sills are compared to opening-related lavas recovered from ODP Leg 104 Hole 642E farther west on the Vïring Plateau and on the NE Greenland conjugate margin. The Utgard sills (3.6-5.9 wt % MgO) are enriched in strongly relative to moderately incompatible trace elements and have 87 Sr/ 86 Sr and 143 Nd/ 144 Nd ratios of 0.70380-70387 and 0.51292-0.51293, respectively, in the Upper Utgard Sill, and 0.70303-0.70306 and 0.51297-0.51299 in the Lower Sill. Alteration is minor. The Utgard melts originated by partial melting of an asthenospheric, depleted mantle source (DMM or Iceland Rift Zone, IRZ, type) with chemical characteristics similar to the source that gave rise to NE Greenland lavas. The Utgard magmas underwent extensive fractional crystallization in the lower crust (Upper Sill: >70%; Lower Sill: >55%) with removal mainly of olivine and pyroxenes, accompanied by 1% assimilation of crustal melts. This crystallization formed significant masses of dense cumulates ($3.25 g/cm 3 ) (underplating). Assuming an areal extent similar to that of the two sills, we estimate a composite layer of ultramafic cumulates mixed with less dense country rocks to be >320 m thick beneath the two Utgard sills and >8.8 km beneath the thickest part of the Vïring Plateau lavas. Opening-related cumulates may thus account for a significant part of the lower crustal high-velocity, high-density bodies (average density 3.1 g/cm 3 ) along the Norwegian margin.

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Petrology of the Northern East Greenland Tertiary Flood Basalts: Evidence from Hold with Hope and Wollaston Forland

Cited by 55 publications

References 0 publications

Evolution of the Vøring Volcanic Margin

Evolution of the Vøring Volcanic Margin

Chemistry of chromian spinel in volcanic rocks as a potential guide to magma chemistry

Sill and lava geochemistry of the mid‐Norway and NE Greenland conjugate margins

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