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canga

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Journal Article
Journal: The Leading Edge
Published: 01 December 1999
The Leading Edge (1999) 18 (12): 1384-1388.
...A. Frasheri; P. Nishani; L. Kapllani; E. Xinxo; B. Canga; F. Dhima GeoRef, Copyright 2004, American Geological Institute. 1999 ...
Journal Article
Journal: Economic Geology
Published: 01 September 2004
Economic Geology (2004) 99 (6): 1197-1213.
... by mine geologists to describe an enigmatic Fe oxide horizon) → black saprolite → yellow laterite → red laterite. The sequence is then capped by a magnetic to nonmagnetic ferricrete known locally as "canga." The succession in pit 2 is from serpentinized peridotite → saprolitized peridotite → brown...
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Journal Article
Journal: Economic Geology
Published: 01 November 1964
Economic Geology (1964) 59 (7): 1203-1240.
... than 7 percent silica), and canga (average 62 percent Fe). Enriched itabirite is typically disaggregated and porous, due to partial solution and removal of quartz; iron oxide is hydrated to varying degree, and enrichment is primarily residual. In intermediate-grade ore, leaching of silica is more...
Image
( A ) Google map image showing a kilometre-scale <b>canga</b> deposit in Carajás, ...
in > Elements
Published: 01 October 2015
F igure 5 ( A ) Google map image showing a kilometre-scale canga deposit in Carajás, Brazil ( B ) Field photograph of ridge within (A), highlighting the arid landscape and the scrub vegetation that grows on the iron oxide. ( C ) Photograph of stromatolite-like texture observed along an ephemeral
Image
Elevation profile along ridgeline (shown in  Fig. 2B ) containing the <b>Canga</b>...
Published: 01 August 2014
Figure 3. Elevation profile along ridgeline (shown in Fig. 2B ) containing the Cangalli Formation ( Fornari et al., 1987 ; Guarachi et al., 2001 ; Mosolf et al., 2011 ) (areas shown in gray). The profile is not drawn perpendicular to the escarpment front. The Tipuani River profile is projected
Image
Location of 16 stratigraphic sections between <b>Cangas</b> de Onís and Panes in ...
Published: 01 November 2000
Figure 3 Location of 16 stratigraphic sections between Cangas de Onís and Panes in the Picos de Europa Province. Outcrop areas of uppermost Moscovian-Kasimovian rocks indicated by shading. Geological map from Marquínez (1989) .
Journal Article
Journal: Palynology
Published: 03 July 2018
Palynology (2018) 42 (3): 311-323.
... A detailed assessment of Poaceae pollen morphology was performed using light and scanning electron microscopy (LM and SEM, respectively), digital image processing and multivariate data analysis of species from the montane savanna (canga vegetation) of the Serra dos Carajas region in the southeastern Amazon...
Series: Society of Exploration Geophysicists Geophysical Monograph Series
Published: 01 January 1991
DOI: 10.5382/Mono.08.15
EISBN: 9781629490038
... and photogeologic anomalies were observed on aerial photographs of a remote region south of the Itacaiunas River and were scheduled for field examination as soon as helicopter access could be arranged. Ground inspection showed the anomalies to be high plateaus covered by a ferruginous crust (canga) containing...
Image
Schematic illustration of the development of different types of goethite ca...
Published: 01 March 2008
with lush vegetation. Canga indicated by small ovoids.
Image
( a ) Zoning of the Iberian Massif, CZ, Cantabrian Zone; WALZ, West Asturia...
Published: 08 April 2016
, Montes de Toledo. ( b ) Geological map of the Narcea antiform in the Iberian Massif. BL, Barrios de Luna; CN, Cangas del Narcea; M, Mieldes; PV, Parada la Vieja; VC, Vega de los Caballeros.
Image
F ig  11. Plot of Ni enrichment vs. the bulk density (ρ) change of various ...
Published: 01 September 2004
is represented by ϵ and is calculated from element concentration and bulk density data. Positive strain suggests dilation of the profile and negative values indicate profile collapse has occurred ( Brimhall and Dietrich, 1987 ). BlS = black saprolite, BrS = brown saprolite, C = canga, GS = green saprolite (ore
Image
Schematic model for iron ore formation in the western Iron Ore Group. (A) H...
Published: 01 March 2008
by the formation of goethite. Mechanical erosion of iron ores and host rocks is expressed by the accumulation of modern canga deposits.
Journal Article
Journal: Elements
Published: 01 October 2015
Elements (2015) 11 (5): 337-342.
...F igure 5 ( A ) Google map image showing a kilometre-scale canga deposit in Carajás, Brazil ( B ) Field photograph of ridge within (A), highlighting the arid landscape and the scrub vegetation that grows on the iron oxide. ( C ) Photograph of stromatolite-like texture observed along an ephemeral...
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Journal Article
Journal: Elements
Published: 01 April 2011
Elements (2011) 7 (2): 119-120.
... is undesirable because it makes steel brittle and is hard to remove. Some ores that originated through surface oxidation are not soft at all but form duricrusts, such as the canga of Brazil. Others are found along unconformities that represent long-vanished paleosurfaces; an example is the Sishen...
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Series: Reviews in Economic Geology
Published: 01 January 2008
DOI: 10.5382/Rev.15.11
EISBN: 9781629490229
... laterite), and canga. Soft or friable hematite-martite ores become cemented by goethite near this lateritic cover, commonly resulting in an upward transition from partially leached, soft saprolitic hematite-martite ore to partly indurated flaky goethitic ore to irregularly banded goethitic ore. Hard...
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Journal Article
Published: 01 April 1996
Journal of the Geological Society (1996) 153 (2): 287-299.
..., J.A. 1980. Mapa Geológico de España E 1:50000 2° Serie, Hoja n° 50 (Cangas del Narcea). Instituto Geologico y Minero de España. Martin Parra, L.M. & Bardají, T. 1989. Mapa Geológico de España E 1:50000 2° Serie, Hoja n o 128 (Riello). Instituto Tecnológico Geominero de España...
Journal Article
Journal: Palynology
Published: 01 June 2014
Palynology (2014) 38 (1): 78-89.
... elevations where soils are shallow, rock outcrops are visible and water from rain drains quickly. The vegetation over rock outcrops – iron deposits – has been referred to as “canga vegetation” ( Secco & Mesquita 1983 ; Silva & Rosa 1989 ) and “campo rupestre” ( Joly 1970 ). Both terms can be used...
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Journal Article
Journal: Economic Geology
Published: 01 March 2008
Economic Geology (2008) 103 (2): 365-386.
... with lush vegetation. Canga indicated by small ovoids. ...
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Journal Article
Published: 01 September 2003
Seismological Research Letters (2003) 74 (5): 618-624.
... appreciate the contributions of our students in the introductory geophysics course at Boston College in 2001 and 2002: Jim Bride, Burak Canga, Matt Capstick, Dan Mooney, Tim O'Connor, Kanya Rhedrick, J. Paul Rinehimer, and Joni Swartz. These students were patient and good-natured about participating in a lab...
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Journal Article
Journal: Interpretation
Published: 16 February 2015
Interpretation (2015) 3 (2): SL1-SL13.
... resulting from such mapping investigations and extensive drilling programs. Drillholes and previous exploration campaigns were planned primarily based on the known surficial orientation of iron formation and the presence of canga, which is a cemented, iron-formation derived surficial layer. The improved...
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