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Chapada Group

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Journal Article
Journal: PALAIOS
Published: 01 April 2017
PALAIOS (2017) 32 (4): 238–249.
...; MÍRIAN LIZA ALVES FORANCELLI PACHECO Abstract This study tests the presence of differential preservation in the Devonian Malvinokaffric fauna from the Chapada Group (Paraná Basin, Brazil). Results of EDXRF, EDS, Raman Spectroscopy, and petrographic analyses show differential preservation of shells...
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Image
Specimens collected in lower Unit 2 of the <b>Chapada</b> <b>Group</b>.  A ) Strophomenat...
in > PALAIOS
Published: 01 April 2017
Fig. 2.— Specimens collected in lower Unit 2 of the Chapada Group. A ) Strophomenata, Schuchertella ?. B ) Calmoniid trilobite. C ) Orbiculoidea sp. D ) Orbiculoidea sp. Scale = 5 mm for views A–C and 2 mm for view D.
Series: Geological Society, London, Memoirs
Published: 01 January 2011
DOI: 10.1144/M36.49
EISBN: 9781862394117
.... 660 Ma. It was orogenically inverted during the late Neoproterozoic Brasiliano event. The Macaúbas Group includes the pre-glacial Matão, Duas Barras and Rio Peixe Bravo formations, the glaciogenic Serra do Catuni, Nova Aurora and Lower Chapada Acauã formations, and the post-glacial Upper Chapada Acauã...
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Series: Geological Society, London, Memoirs
Published: 01 January 2011
DOI: 10.1144/M36.47
EISBN: 9781862394117
... metasedimentary rocks of the Chapada Diamantina Group. The overlying carbonate succession (Salitre Fm.) is informally subdivided into five mappable units. Unit C, at the base, is composed of red argillaceous dolostone with typical negative δ 13 C signatures averaging –5.1‰ (VPDB). Unit B consists of grey...
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Journal Article
Journal: Clay Minerals
Published: 01 September 2015
Clay Minerals (2015) 50 (4): 431–440.
... or gently undulating with large flat areas known as chapadas (‘high plains’) that are dissected by rivers forming swamps known locally as veredas (‘paths’). The present study is concerned mainly with a representative toposequence in the watershed of the Lagoa do Leandro vereda, a swamp near the city...
Journal Article
Published: 27 November 2019
Journal of Sedimentary Research (2019) 89 (11): 1140–1170.
... previously been proposed for the Bokkeveld Group. Sequence-stratigraphic analysis of the Bidouw Subgroup suggests that although sedimentation occurred during two large-scale second-order transgressive events, the succession was predominantly regressive. Third-order and fourth-order transgressive–regressive...
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Journal Article
Published: 09 December 2010
Geological Magazine (2011) 148 (2): 334–339.
...ERIC BUFFETAUT; ATTILA ŐSI; EDINA PRONDVAI Abstract The fragmentary pterosaur material from the Campanian Grünbach Formation (Gosau Group) of Muthmannsdorf (Austria), previously identified as Ornithocheirus buenzeli Bunzel, 1871, is revised. A lower jaw fragment shows a helical type of articulation...
Journal Article
Published: 01 April 2015
Mineralogical Magazine (2015) 79 (2): 269–283.
... 1.43 (Ti 13.02 Fe 4.98 3 + ) Σ18.00 ( Fe 0.32 3 + Mn 0.15 ) Σ0.47 [O 37.18 (OH) 0.82 ] Σ38.00 . It is trigonal, space group R 3İ, with the unit-cell parameters a = 10.4359(2), c = 21.0471(4) Å, V = 1985.10(7) Å 3 and Z = 3. The crystal structure was solved ( R 1 = 0.039) using 2110 unique reflections...
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Journal Article
Published: 01 September 2008
South African Journal of Geology (2008) 111 (2-3): 281–304.
... set thicknesses within the Mogalakwena Formation, Main Basin, Palaeoproterozoic Waterberg Group in South Africa are presented. These data are compared to similar, published data, derived from two other Waterberg units, the Blouberg Formation (northeast of Main Basin) and the Wilgerivier Formation...
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Journal Article
Journal: Palynology
Published: 22 December 2017
Palynology (2017) 41 (0): 121–137.
... discussed. Devonian deposits of the Paraná basin in Uruguay, locally known as the Norte Basin (Cuenca Norte), were first identified by Terra Arocena ( 1926 ) from wells drilled at Rincón de Alonso. Bossi ( 1966 ) introduced the name Durazno Group for all the Devonian sedimentary rocks of the Durazno...
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Journal Article
Published: 01 December 2013
Mineralogical Magazine (2013) 77 (8): 3197–3215.
... phyllite within the São João da Chapada Formation near Diamantina. The hematitic phyllite is a metamorphosed and metasomatized volcanic rock ( Cabral et al ., 2012 ). The coincident ages for the hematitic phyllite from the São João da Chapada Formation and the metarhyolite from the Itapanhoacanga...
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Journal Article
Published: 01 March 2013
Journal of the Geological Society (2013) 170 (2): 353–363.
... in volcanic rocks from the Chela Group (this study) and the lower part of the Espinhaço Supergroup of eastern Brazil ( Pedreira & de Waele, 2008 ). In the São João de Chapada Formation of the southern Espinhaço Range zircon ages of 1715 ± 12 Ma and 1710 ± 12 Ma have been reported (for details, see...
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Journal Article
Journal: Economic Geology
Published: 01 December 2009
Economic Geology (2009) 104 (8): 1265–1276.
... is a banded iron-formation unit that grades upward into dolomitic rocks of the Gandarela Formation. The Cauê Formation and the Gandarela Formation form the Paleoproterozoic Itabira Group, which overlies clastic metasedimentary rocks of the Caraça Group, the basal sequence of the Minas Supergroup (e.g...
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Series: Geological Society, London, Special Publications
Published: 01 January 2008
DOI: 10.1144/SP294.3
EISBN: 9781862395428
... dos Remédios, Paraguaçu and Chapada Diamantina groups, modified from Pedreira (1994) and Pedreira & Rocha (2004) . Several sedimentary successions occur on the Congo Craton (Fig.  2 ), from west to east, the Chela Group in Angola, the Kibaran Supergroup in the Mesoproterozoic Kibaran Belt...
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Journal Article
Published: 01 February 2018
Mineralogical Magazine (2018) 82 (1): 133–144.
... ) 3 F 2 , occurs in a hydrothermal vein crosscutting a metarhyolite of the Rio dos Remédios Group, at the Mula mine, Tapera village, Novo Horizonte county, Bahia, Brazil, associated with hematite, rutile, almeidaite, fluocerite-(Ce), brockite, monazite-(La), rhabdophane-(La) and bastnäsite-(La...
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Geological context of the study area.  A ) Geologic map of the Mato Grosso ...
in > PALAIOS
Published: 01 April 2017
section locations. C ) General stratigraphic chart of the Chapada Group, from Alto Garças sub-basin of the Paraná Basin (based on Grahn et al. 2013 and references therein). D ) Stratigraphic section analyzed located in view B.
Image
Conceptual overview of fossilization mechanism for Devonian fossils of the ...
in > PALAIOS
Published: 01 April 2017
Fig. 10.— Conceptual overview of fossilization mechanism for Devonian fossils of the Chapada Group. A ) Originally calcite shell. B ) Originally phosphatic shell. C ) Pyritization processes explained in Equation 1 . D ) Pyritization and phosphatization processes ( Eq. 2 ) forming phosphatic
Journal Article
Journal: AAPG Bulletin
Published: 01 August 1960
AAPG Bulletin (1960) 44 (8): 1316–1370.
... and marine transgressions, the Upper Pennsylvanian coal-bearing beds and marine transgressional deposits, the Lower Permian group with the bituminous shales, the Upper Permian group with brackish to fresh-water formations, the Upper Triassic continental eolian deposits, and the Juro-Triassic extrusive lavas...
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Journal Article
Journal: Paleobiology
Published: 26 April 2018
Paleobiology (2018) 44 (3): 402–433.
...John T. Clarke; Matt Friedman Abstract Comprising Holostei and Teleostei, the ~32,000 species of neopterygian fishes are anatomically disparate and represent the dominant group of aquatic vertebrates today. However, the pattern by which teleosts rose to represent almost all of this diversity, while...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1945
AAPG Bulletin (1945) 29 (5): 495–563.
... petroliferous, and an attempt has been made to classify them into three groups: (a) most favorable, (b) moderately favorable, and (c) possibly petroliferous but for various reasons less promising than the two preceding groups. An unexpected result of the study was the suggestion that the eastern half...
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