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Halla Formation

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FIGURE 1 —Location of the <b>Halla</b> <b>Formation</b> outcrop belt. In the top right fi...
in > PALAIOS
Published: 01 December 2000
FIGURE 1 —Location of the Halla Formation outcrop belt. In the top right figure, the proximal parts of the formation are gray-stippled, whereas the more distal Mulde Brick-clay and Djupvik members are marked in black. The enlargement shows the stratigraphy of the Klintehamn area and the localities
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Figure 4. Well-preserved silicified chitons from <b>Halla</b> <b>Formation</b>, Möllbos....
in > Geology
Published: 01 September 2000
Figure 4. Well-preserved silicified chitons from Halla Formation, Möllbos. A: Chelodes actinis , Naturhistoriska Riksmuseet, Stockholm, RM Mo159.977, dorsal view. B: Arctoplax ornata , RM Mo159.853, dorsal view. Scale bars = 1 mm.
Journal Article
Published: 01 March 2003
Geological Magazine (2003) 140 (2): 173–203.
... deposition predominated; the Gannarve Member. The subsequent lowstand resulted in regional emersion and karstification, i.e. a complete termination of the platform. The post-extinction transgressive systems tract (TST) is exclusively composed of non-skeletal carbonates; the Bara Member of the Halla Formation...
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Journal Article
Journal: PALAIOS
Published: 01 December 2000
PALAIOS (2000) 15 (6): 511–523.
...FIGURE 1 —Location of the Halla Formation outcrop belt. In the top right figure, the proximal parts of the formation are gray-stippled, whereas the more distal Mulde Brick-clay and Djupvik members are marked in black. The enlargement shows the stratigraphy of the Klintehamn area and the localities...
FIGURES | View All (10)
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
... by partial melting (migmatization) and penetrative deformation, and resulted in the formation of the hypersthene–plagioclase granulites. 2.1–2.0 Ga: A Palaeoproterozoic metamorphic overprint formed, and the approximately 2.0 Ga metatrachybasaltic dykes intruded the host rocks. The metamorphic mineral...
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
... Abstract The Neoarchaean Era is characterized by large preserved record of continental crust formation. Yet the actual mechanism(s) of Neoarchaean crustal growth remains controversial. In the northwestern part of the eastern Dharwar craton (EDC) granitoid magmatism started at 2.68 Ga...
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
..., provides evidence for a change in global tectonic regime close to the Archaean–Proterozoic boundary. After the long-term episodic formation of tonalite–trondhjemite–granodiorite (TTG) suites of oceanic origin, convergent continental margins with abundant batholiths of potassic granitoids appeared...
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
... in the supplementary material and illustrated in diagrams in Figures 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 . To discuss the possible genetic models for the study area and link them to various tectonic models for crust formation, we need to group the granitoids on the basis...
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
.... 2008 ; Halla et al. 2009 ), allowing some mantle upwelling at the time. The observed high δ 18 O values indicate crustal recycling; thus, quartz syenites do not form a compositionally co-magmatic group of granitoids, but rather display some elemental features similar to sanukitoids. We consider them...
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
... ) are frequently interpreted as the crust formation age, inferred as the extraction of the crustal rocks from the mantle sources (e.g. McCulloch & Wasserburg 1978 ; DePaolo 1981 ; Nelson & DePaolo 1985 ; DePaolo et al. 1991 ). The variation of Sm/Nd ratios in crustal rocks are mostly inherited from...
Journal Article
Journal: AAPG Bulletin
Published: 01 June 1993
AAPG Bulletin (1993) 77 (6): 1016–1040.
...Alister C. MacDonald; Eva K. Halland ABSTRACT Sandstone-rich fluvial reservoirs of the upper part of the Statfjord Formation in Statfjord field, northern North Sea, include significant proportions of interstratified shale beds which complicate the production of oil under a high-pressure miscible...
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Journal Article
Published: 01 February 1987
Journal of the Geological Society (1987) 144 (1): 107–114.
...A. HALLAM; J. B. MAYNARD Abstract A distinctive and widespread belemnite-bearing shale of the Tethyan region is well exposed in the Trans-Indus Salt Range as the Chichali Formation, where it contains two workable ironstone seams. Facies analysis indicates a pronounced deepening in the Upper...
Journal Article
Published: 01 July 1986
Geological Magazine (1986) 123 (4): 425–435.
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
... found in some of the MMEs. Some of the interesting petrographic features are given below. Fig. 3. ( a ) MMEs displaying subophitic texture. ( b ) MMEs with acicular apatite formed by the rapid crystallization of the mafic magma. ( c ) MMEs displaying corona structure with formation...
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
... the margins of subduction zones ( Gill 1981 ; Kelemen et al. 2003 ), the occurrence of such rocks in the Archaean craton of Greenland may indicate a similar geological environment of formation. However, the geodynamic setting(s) of Archaean supracrustal belts worldwide is surrounded by controversy...
Series: Geological Society, London, Special Publications
Published: 01 January 2017
EISBN: 9781786202949
... consists predominantly of felsic and intermediate volcanic rocks and epiclastic metasedimentary rocks, with only sporadic intervals of mafic and ultramafic volcanic rocks, as well as banded iron formations. Some evidence has recently been found for an older greenstone succession with an age of 2.88 Ga...
Series: AAPG Special Publication
Published: 01 January 1991
DOI: 10.1306/SP535C19
EISBN: 9781629811192
... Abstract The Kuparuk River field on the North Slope of Alaska (Figure 1) is the second largest producing oil field in North America. Currently the production from the Lower Cretaceous Kuparuk formation exceeds 300,000 barrels of oil per day under waterflooding. This reservoir is overlain...
Series: AAPG Memoir
Published: 01 January 2014
EISBN: 9781629812717
... proved insurmountable and we are unable to accurately determine average formation properties in the Upper Lance over large parts of the field. We did not separately evaluate the Wagon Wheel Formation (”unnamed Tertiary unit” of Law and Johnson, 1989) as part of this study. Figure 11. Lance gross...
Journal Article
Published: 01 May 1990
Journal of the Geological Society (1990) 147 (3): 421–424.
.... The boundary is placed at the base of the Blue Lias Formation. References Blind W. Die Ammoniten des Lias alpha aus Schwaben, von Fonsjoch und Breitenberg (Alpen) und ihre Entwicklung Palaeontographica 1963 38 131 121A Bown, P. R. & Lord, A. R. 1990. The occurrence of calcareous...
Journal Article
Journal: Geology
Published: 01 July 1986
Geology (1986) 14 (7): 609–612.
... to climatic variations affected by “Milankovitch” orbital cycles. A test is proposed and illustrated mainly with reference to the Blue Lias Formation of Dorset, England, that appears to indicate that many limestones can be produced solely by rhythmic unmixing of CaCO 3 during diagenesis. Unless...