Rio Trombetas

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Journal Article
Published: 01 January 2002
Bulletin de la Société Géologique de France (2002) 173 (1): 67–75.
... and the northern basin rivers (Rio Negro, Rio Branco, Rio Trombetas). In the latter, kaolinites are the dominant clays and exhibit close crystal chemistry characters such as degree of disorder. FT-IR of colloids exhibits similar signatures of humic substances in all rivers. By contrast, EPR reveals various species...
Series: AAPG Studies in Geology
Published: 01 January 1978
DOI: 10.1306/St6398C8
EISBN: 9781629812007
... the following sedimentary units: Trombetas Formation (Silurian, marine); Botucatu Formation (Jurassic, continental); Rio do Rasto Formation (Permian, continental); Irati Formation (Permian, marine); Rio Bonito Formation (Permian, marine); Sepotuba Formation (Cambrian, marine); Estancia Formation (Cambro...
Journal Article
Published: 01 April 2010
Earth Sciences History (2010) 29 (1): 52–68.
... for assistance in preparing her second monograph for the Brazilian Survey because she recognized that she was “quite out of my latitudes in the Silurian”. Rio Trombetas graptolites from the State of Pará were described in the monograph, correlated with basal Silurian graptolite zones in Britain, Bolivia, Peru...
Journal Article
Journal: Economic Geology
Published: 01 August 2016
Economic Geology (2016) 111 (5): 1277–1290.
... in the Parnaíba basin in the Paragominas region. The Trombetas deposit was the first to be discovered, and the mining company Mineração Rio do Norte (MRN) began mining operations there in 1979. More recently, in 2007, Vale (actually led by Norsk Hydro) began mining activities in the Paragominas deposit, and two...
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Journal Article
Published: 01 July 2006
Geological Magazine (2006) 143 (4): 509–529.
... from the Kirusillas and Tarabuco formations in the Rio Pilaya, Sella, Sobo-Sobo and Tarabuco sections. Liachenko (1994) discussed Upper Silurian and Lower Lochkovian chitinozoans from three sections in the Kirusillas and Tarabuco formations along Rio Chimoré. However, the quality of her...
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Journal Article
Published: 01 August 2002
Clays and Clay Minerals (2002) 50 (4): 494–503.
..., for instance, for the bauxite deposits of Paragominas, Trombetas and Carajás, in Pará State and the kaolin deposits of Manaus (Amazon), Rio Jari (Amapá) and Rio Capim (Pará). The kaolin deposits of the Amazon region are the most important in Brazil and constitute one of the world’s largest reserves...
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Journal Article
Journal: AAPG Bulletin
Published: 01 September 1964
AAPG Bulletin (1964) 48 (9): 1475–1512.
... of sandstones at the village of Cabeças, Piauí. The name Longá Formation was first applied by Albuquerque (1946) to the dark shales in the valley of the Rio Longá near Campo Maior, Piauí. The name Potí was originally introduced by Lisboa (1914) for carbonaceous sandstones exposed in the Rio Potí valley...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 1950
AAPG Bulletin (1950) 34 (7): 1393–1428.
... Petroliferos Fiscales (Y.P.F.), carried out the only exploratory work, which consisted of several parties engaged in geological and geophysical surveys. A gas field was discovered in Tierra del Fuego, 10 miles north of the port of Rio Grande ( Fig. 1 ). The discovery well produced gas at the rate of about...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1962
AAPG Bulletin (1962) 46 (10): 1773–1814.
... reaches of the Rio Duda, Eastern Cordillera of Colombia ( Harrington and Kay, 1951 ), and (3) Upper Cambrian limestones exposed in a single small locality west of Mendoza, in the Precordillera of western Argentina ( Poulsen, 1958 ). The Middle Cambrian faunas are characterized by genera belonging...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 1947
AAPG Bulletin (1947) 31 (7): 1194–1241.
... .) Clarke , J. M. ( 1899 ), “ A fauna siluriana superior do Rio Trombetas, ” ibid. , 10 . ( Portug. u. Engl. text ). Clarke , J. M. ( 1899 ), “ Molluscos devonianos do Estado do Para, ” ibid . Clarke , J. M. ( 1913 ), “ Fosseis Devonianos do Paraná, ” Serv. Geol. do Brasil...
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Journal Article
Journal: Palynology
Published: 01 January 2000
Palynology (2000) 24 (1): 147–176.
....), Ordovician–Devonian palynostratigraphy in Western Gondwana: update, problems and perspectives . Faculdadede Geologia, Universidade do Estado do Rio de Janeiro , pp. 147 – 163 . GRAHN , Y. , and PARIS , F. 1992 Age and correlation of the Trombetas Group, Amazonas Basin, Brazil . Revue de...
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Journal Article
Journal: Palynology
Published: 22 December 2017
Palynology (2017) 41 (0): 138–157.
... . Revista de la Ascociación Argentina de Sedimentología 4 : 97 – 109 . Cardoso TRM , Rodrigues MAC . 2005 . Acritarcos e prasinófitas do Siluriano da bacia do Amazonas: um poderoso auxílio na calibração bioestratigráfica do Grupo Trombetas . Anuário do Instituto de Geociências 28 : 131...
Journal Article
Published: 07 July 2010
Geological Magazine (2011) 148 (2): 226–236.
... to their extinction. Yngve Grahn thanks the Faculty of Geology at Universidade do Estado do Rio de Janeiro (UERJ), and Dr C. S. Valladares, head of the post-graduate progam at the Faculty of Geology for access to the facilities, and the Conselho Nacional de Desenvolvimento Cientifico e...
Series: AAPG Memoir
Published: 01 January 2000
DOI: 10.1306/M73705C13
EISBN: 9781629810706
... the Trombetas Group, is bounded at the top by a Lower Devonian unconformity and comprises glacial and marine clastic sedimentary rocks. This group is subdivided into the following formations (from bottom to top): the Autás–Mirim, represented by Lower Ordovician fluvial–marine sandstones and neritic shales...
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Series: SEPM Concepts in Sedimentology and Paleontology
Published: 01 January 2013
DOI: 10.2110/sepmcsp.11.031
EISBN: 9781565762893
..., present in the sub-Mamuniyat Formation. Mauritania, Rio de Oro, Senegal Deynoux and Trompette ( in Hambrey and Harland, 1981, pp. 89-96; see also Deynoux, 1985, and Blanpied et al., 1998) discussed tillites (T153: 15°N, 8°W) and related phenomena of the Tichit Group, including some glaciated...
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Series: Economic Geology
Published: 01 January 2005
DOI: 10.5382/AV100.21
EISBN: 9781934969519
... have not been demonstrated to form economic deposits, they can, however, significantly upgrade orthobauxites to economic thresholds. The most representative cryptobauxites occur in the region of Manaus, Juriti, and Trombetas in Brazil ( Kronberg et al., 1982 ; Aleva, 1984 ; Kotschoubey...