The Role of Tectonics on the Preservation of Incised-Valley Estuaries in Areas with Low Accommodation Rates: Examples from Upper Cretaceous and Miocene Successions in Northern Brazil

2006 ◽  
pp. 199-217 ◽  
Author(s):  
DILCE DE FÁTIMA ROSSETTI
Keyword(s):  
Upper Cretaceous ◽  
Incised Valley ◽  
Northern Brazil

scholarly journals “Civilizing” the Amazon: Amerindians and the Portuguese Crown’s Struggle for Sovereignty, 1650-1777

2008 ◽  
Vol 18 (2) ◽  
pp. 226-253
Author(s):  
Helena Nunes Duarte
Keyword(s):  
Economic Independence ◽  
The Enlightenment ◽  
Northern Brazil ◽  
Native Policy

Abstract This article examines Portuguese colonization techniques in northern Brazil and subsequent changes during the regime of the Marquis of Pombal (1750-1777), which centred on restructuring defence, settlement, and the role of natives in the colonies. Focusing on the 1758 Indian Directorate, a collection of laws on native policy, the article examines how, despite the Enlightenment humanitarian trappings of the reform, it had a far more complex purpose than merely converting Indians into loyal subjects of the Portuguese crown. The legislation was just one part of a multi-faceted attempt to establish the crown’s sovereignty in the Amazon, which included taking power from the Jesuits, subjugating the natives, defining imperial territory, and asserting economic independence.

scholarly journals Tectonic control on the stratigraphic framework of Late Pleistocene and Holocene deposits in Marajó Island, State of Pará, eastern Amazonia

2010 ◽  
Vol 82 (2) ◽  
pp. 439-449 ◽  
Author(s):  
Dilce F. Rossetti
Keyword(s):  
Late Quaternary ◽  
Fault Reactivation ◽  
Passive Margin ◽  
Stratigraphic Correlation ◽  
Sedimentary Records ◽  
Stratigraphic Framework ◽  
Island State ◽  
Marajó Island ◽  
Northern Brazil

The traditional view that the Brazilian Amazonia is located in a tectonically stable area since the Cretaceous is changing in front of the increasing documentation of fault reactivations even during the Holocene. How the sedimentary record has responded to these events is an issue that remains to be approached with basis on field data. This work focuses on the stratigraphic correlation of late Quaternary deposits from eastern Marajó Island, with the goal of demonstrating the role of fault reactivation on the origin and preservation of these deposits. Despite the location in a stable platform of a continental passive margin, three studied stratigraphic units display significant vertical offsets that define two depocenters that are better explained through tectonic displacements. This interpretation is reinforced by several morphostructural features related to faults that occur between the studied drills. Without the influence of tectonics, sediment preservation in this characteristically low-lying terrain would have been negligible. The results of the present work motivate to look for other tectonically-influenced areas in Amazonia, which similarly might have acted as sites for sediment accommodation during the late Quaternary. These sedimentary records have great potential to be the source of valuable information for reconstructing Quaternary geological events in Northern Brazil.

Mining, processing and applications of the Capim Basin kaolin, Brazil

Clay Minerals ◽  
2007 ◽  
Vol 42 (2) ◽  
pp. 145-151 ◽  
Author(s):  
H. H. Murray ◽  
C. A. Alves ◽  
C. H. Bastos
Keyword(s):  
Particle Size ◽  
Upper Cretaceous ◽  
The Other ◽  
South American ◽  
Paper Coating ◽  
High Quality ◽  
Mine Site ◽  
Northern Brazil ◽  
North And South ◽  
Spray Dried

AbstractHigh-quality kaolins are produced from two sites in the Capim River area in Pará State, northern Brazil. One mine is operated by Rio Capim Caulim (RCC) owned by Imerys and the other by Pará Pigmentos S.A. (PPSA) owned by Caemi (CVRD Group). The kaolin deposits are located on low-relief plateaux with a lateritic cap. The kaolin strata are in the Ipixuna Formation of Upper Cretaceous Age. There are two distinct kaolin layers, a 4–5 m thick soft kaolin which is overlain in the southern portion of the basin by a 4–5 m thick hard kaolin. The soft and hard designations refer to particle size, with the soft kaolin being relatively coarse and the hard kaolin very fine. The kaolin is mined, partially beneficiated, and pumped through pipelines to the port at Barcarena on the Guama River, a large tributary of the Amazon River. The PPSA kaolin is fully processed at the plant near the mine site and pumped to Barcarena where it is spray dried. The RCC kaolin is only partially processed at the mine site. This partially processed kaolin is pumped to Barcarena where it is beneficiated. The finished kaolin is high quality and is shipped to North and South American, European, and Asian paper-coating markets. More than 1.6M tons were shipped from Barcarena in 2005.

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