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Casas Velhas Formation

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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP435.1
EISBN: 9781786202901
... environments and during sediment diagenesis ( Gac et al . 1977 ; Stoessell & Hay 1978 ; Darragi & Tardy 1987 ; Pozo & Casas 1999 ). Gel dehydration was invoked as a main driver for the formation of kerolite associated with microbial mats in speleothems in basaltic caves found in Hawaii...
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Journal Article
Published: 01 May 2010
Journal of the Geological Society (2010) 167 (3): 519-538.
... is necessary to place the older palaeo-markers close to or below the present sea level, as their resulting vertical displacement is somewhat less than the minimum Quaternary displacement of 75 m. For example, the Casas Velhas Formation has a passage zone between subaerial and submarine facies at 35–40 m a.s.l...
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Series: Reviews in Economic Geology
Published: 01 January 2008
DOI: 10.5382/Rev.15.09
EISBN: 9781629490229
... ( 2005 ). F ig . 5. Carbon and oxygen isotope data of dolomite from itabirite of the Cauê Formation and dolostone of the Gandarela Formation at the Quadrilátero Ferrífero. Dolomitic itabirite of the Cauê Formation (own data and from Spier, 2005 , and Spier et al., 2007 ); data for Gandarela...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2012
GSA Bulletin (2012) 124 (5-6): 800-816.
... and Eocene phases of uplift led to almost complete removal of these deposits by river erosion to base level and to formation of a peneplain (the higher surface) with a deeply weathered surface ( Fig. 8B ). Japsen et al. (2012) suggested that landscapes typical of elevated passive continental margins around...
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Journal Article
Journal: Economic Geology
Published: 01 May 2004
Economic Geology (2004) 99 (3): 611-624.
.... These solutions were also likely responsible for the initial oxidation of the iron formations and the development of hematite I. Subsequent uplifted hot basement rocks or post-tectonic plutons were probable heat sources for the regional metamorphism and development of a granoblastic fabric of hematite II grains...
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Journal Article
Published: 01 January 2015
Journal of the Geological Society (2015) 172 (1): 45-61.
... previously in an accretionary prism. Below this unit, the Lower Parautochthon is a less pervasively deformed tectonic slice including two lithostratigraphic units (Travanca and Vila Chã formations) composed of Culm-type synorogenic low-grade metasediments deposited in a tectonic trench located between...
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Journal Article
Published: 12 December 2017
Journal of Sedimentary Research (2017) 87 (12): 1285-1313.
... and seem to replace stevensite like spherulites inside unconsolidated sediments. Intraclastic grainstones and rudstones have average porosities of 6.34% (0.1–19%) and average permeability of 10.45 mD (< 0.001–523 mD). Pozo and Casas (1999) suggested that gel coagulation would result in granular clay...
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Journal Article
Journal: Economic Geology
Published: 01 June 2017
Economic Geology (2017) 112 (4): 941-982.
... the footwall. The significant chemical influence and importance of country-rock lithologies as a possible elemental source, for example, must be taken into account when interpreting whole-rock geochemical data and investigating an itabirite-/banded iron formation-hosted iron ore system. The itabirite and iron...
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Journal Article
Journal: Lithosphere
Published: 30 June 2017
Lithosphere (2017) 9 (5): 726-744.
..., an increasing amount of geochronological data suggests that their formation took place over a short time interval, from ca. 315 to 300 Ma ( Regêncio Macedo, 1988 ; Rodríguez et al., 2003 ; Valle Aguado et al., 2005 ; Gutiérrez-Alonso et al., 2015 ; Díez Fernández and Pereira, 2016 ). Consequently, models...
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