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Helvetiafjellet

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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP434.10
EISBN: 9781862391581
... Fig. 3. Sedimentological log through the lower middle part of the Lower Cretaceous Helvetiafjellet Formation at the Boltodden tracksite (see Fig. 2 a for the proposed stratigraphic position) showing lithologies, sedimentary and biogenic structures, and interpretations of depositional...
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Series: GSA Special Papers
Published: 01 January 1992
DOI: 10.1130/SPE267-p209
... The coal-bearing Helvetiafjellet Formation represents a broad fluviodeltaic system (ca. 200 km wide), with high sand-influx and progradation potential, which gradually retreated landward due to rising sea-level. The subenvironments that hosted plant growth and peat (coal) deposition ranged from...
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1979
AAPG Bulletin (1979) 63 (12): 2193-2203.
...MARC B. EDWARDS Abstract The Helvetiafjellet Formation consists of 50 to 100 m of largely fluvial sandstones and shales deposited throughout Svalbard during a major regression. Sandstones consist chiefly of monocrystalline and polycrystalline quartz, feldspar, chert, and volcanic (basaltic) rock...
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Journal Article
Journal: Geosphere
Published: 01 October 2016
Geosphere (2016) 12 (5): 1594-1605.
... utility of carbon-isotope stratigraphies. Isotopic analysis of fossil wood fragments (from the Rurikfjellet, Helvetiafjellet, and Carolinefjellet formations, Festningen, Spitsbergen) record a distinctive pattern including a negative isotope excursion preceding a positive event, correlatable...
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Journal Article
Published: 24 May 2013
Journal of the Geological Society (2013) 170 (4): 657-668.
... of the Lower Cretaceous Helvetiafjellet Formation. Time–structure maps and analysis of the sub-bottom structural trends were generated for each horizon. The top of the metamorphic basement displays north–south-trending graben structures, apparently representing continuation of the Devonian grabens from...
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Image
Typical Modal Compositions of <b>Helvetiafjellet</b> Formation and Janusfjellet Fo...
Published: 01 April 2000
Table 1 Typical Modal Compositions of Helvetiafjellet Formation and Janusfjellet Formation Samples
Image
Typical Modal Compositions of <b>Helvetiafjellet</b> Formation and Janusfjellet Fo...
Published: 01 April 2000
Table 1 Typical Modal Compositions of Helvetiafjellet Formation and Janusfjellet Formation Samples
Image
<b>Helvetiafjellet</b> Formation sandstone from fault block 10 with low intergranu...
Published: 01 April 2000
Figure 17 Helvetiafjellet Formation sandstone from fault block 10 with low intergranular volume at least partly due to clay at grain contacts promoting dissolution of parts of quartz grains. Arrow near scale bar points upward. Scale bar = 1 mm.
Image
—Locality map, showing study area against background of <b>Helvetiafjellet</b> For...
Published: 01 April 1988
Figure 1. —Locality map, showing study area against background of Helvetiafjellet Formation outcrop (in black) and regional paleocurrent data. Indicated also are main tectonic lineaments (basement fault zones), inferred to have been active during the Mesozoic (after Steel and Worsley, 1984 ).
Image
—Representative composite vertical log through <b>Helvetiafjellet</b> Formation in...
Published: 01 April 1988
Figure 3. —Representative composite vertical log through Helvetiafjellet Formation in study area, showing succession of depositional facies and its broad interpretation (see Figure 2C for guidance).
Image
—Detailed sketch of studied cliff-section of <b>Helvetiafjellet</b> Formation and ...
Published: 01 April 1988
Figure 6. —Detailed sketch of studied cliff-section of Helvetiafjellet Formation and uppermost Janusfjellet Formation, with intraformational slide features and buried collapse scars (drawn from a photomosaic). Section extends, with slight overlap, from southern scar sector (A) through northern
Image
—Triangle compositional classification ( Okada, 1971 ) of <b>Helvetiafjellet</b> s...
Published: 01 December 1979
FIG. 4 —Triangle compositional classification ( Okada, 1971 ) of Helvetiafjellet sandstones.
Image
—Paragenetic sequences in <b>Helvetiafjellet</b> Formation, according to sandstone...
Published: 01 December 1979
FIG. 15 —Paragenetic sequences in Helvetiafjellet Formation, according to sandstone type, showing relative order in which cements formed. Dotted arrow indicates inferred transition from pore lining to pore filling for given mineral. Paragenetic sequence for particular sandstone may commence
Journal Article
Published: 11 June 2013
Geological Magazine (2013) 150 (6): 1127-1135.
.... A bentonite in the Helvetiafjellet Formation, also on Svalbard, has an age of 123.3 ± 0.2 Ma. Zircon in mafic sills intersected by drill cores in Franz Josef Land indicate an age of 122.7 Ma for a thick sill on Severnaya Island and a single grain age of ≥122.2 ± 1.1 Ma for a thinner sill on Nagurskaya Island...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 2000
AAPG Bulletin (2000) 84 (4): 505-522.
...Table 1 Typical Modal Compositions of Helvetiafjellet Formation and Janusfjellet Formation Samples ...
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Image
—Vertical log through the pre-collapse succession of uppermost Janusfjellet...
Published: 01 April 1988
Figure 5. —Vertical log through the pre-collapse succession of uppermost Janusfjellet Formation and lowest Helvetiafjellet Formation (data from block 10 in Figure 6C ), showing its facies development and broad environmental interpretation.
Image
—Composition of grains and cement, and mean grain size of sandstones in Hel...
Published: 01 December 1979
FIG. 3 —Composition of grains and cement, and mean grain size of sandstones in Helvetiafjellet Formation at six localities in Svalbard (grain size indicated in center columns). Festningen profile modified from Steel et al (1978) . For locations see Figure 1 .
Image
—Schematic reconstruction of relation of paleogeography, provenance, and sa...
Published: 01 December 1979
FIG. 5 —Schematic reconstruction of relation of paleogeography, provenance, and sandstone composition in Helvetiafjellet Formation; A, early phase, supply of quartz-rich sands from west; B, late phase, local derivation of volcanic-rich sand from east. See Figure 1 for line of section.
Image
—Sketch of cliff section north of Kvalvågen (see location in  Figure 1 ) sh...
Published: 01 April 1988
Figure 4. —Sketch of cliff section north of Kvalvågen (see location in Figure 1 ) showing a southern sector with intraformational slide features at Janusfjellet Formation/Helvetiafjellet Formation boundary and broader, undisturbed northern sector. Note two buried collapse scars discussed
Journal Article
Journal: AAPG Bulletin
Published: 11 November 1997
AAPG Bulletin (1997) 81 (11): 1827-1842.
... unconformity, approximately 0.5 s twt above the Jurassic–Cretaceous boundary (Solheim et al., in press). Seen in relation to the geology of Svalbard, reflector II may correspond to the boundary between the Rurikfjellet (Ryazanian–Hauterivian) and the Helvetiafjellet (Barremian) formations ( Edwards, 1978...
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