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Guadalupe Group

The Guadalupe Group (Spanish: Grupo Guadalupe, K2G, Ksg) is a geological group of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The group, a sequence of shales and sandstones, is subdivided into three formations; Arenisca Dura, Plaeners and Arenisca Labor-Tierna, and dates to the Late Cretaceous period; Campanian-Maastrichtian epochs and at its type section has a thickness of 750 metres (2,460 ft).

Guadalupe Group
Stratigraphic range: Campanian-Maastrichtian
~80–70 Ma
Santuario de Guadalupe vista desde Monserrate.JPG
Guadalupe Hill
Type locality of the Guadalupe Group
Type Geological group
Sub-units Arenisca Labor-Tierna
Plaeners
Arenisca Dura
Underlies Guaduas Formation
Overlies Villeta Group
 Conejo Fm. & Chipaque Fm.
Lithology
Primary Sandstone, shale
Other Salt (allochtonous)
Location
Coordinates 4°35′31″N 74°03′15″W / 4.59194°N 74.05417°W / 4.59194; -74.05417Coordinates: 4°35′31″N 74°03′15″W / 4.59194°N 74.05417°W / 4.59194; -74.05417
Region Altiplano Cundiboyacense
Eastern Ranges, Andes
Country  Colombia
Type section
Named for Guadalupe Hill
Named by Pérez & Salazar
Year defined 1978
Coordinates 4°35′31″N 74°03′15″W / 4.59194°N 74.05417°W / 4.59194; -74.05417
Region Cundinamarca, Boyacá
Country  Colombia
Thickness at type section 750 metres (2,460 ft)
Blakey 065Ma - COL.jpg
Paleogeography of Northern South America
65 Ma, by Ron Blakey

Contents

EtymologyEdit

The group was published in 1978 by Pérez and Salazar and named after its type locality Guadalupe Hill in the Eastern Hills of Bogotá.[1]

DescriptionEdit

LithologiesEdit

The Guadalupe Group is characterised by three formations; two sandstone sequences, Arenisca Dura and Arenisca Labor-Tierna, and an intermediate shale formation; Plaeners.[1]

Stratigraphy and depositional environmentEdit

The Guadalupe Group overlies the Conejo Formation in the central part of the Altiplano Cundiboyacense and the Chipaque Formation in the eastern part and is overlain by the Guaduas Formation. Some authors define the Guadalupe Group as a formation and call the individual formations members.[2] The thickness of the Guadalupe Group in its type locality Guadalupe Hill and the El Cable Hill is 750 metres (2,460 ft).[3] The age has been estimated to be Campanian-Maastrichtian.[4] The Guadalupe Group has been deposited in a marine environment.[5]

OutcropsEdit

 
 
Type locality of the Guadalupe Group to the east of the Bogotá savanna

The formations of the Guadalupe Group are apart from its type locality at Guadalupe Hill, Bogotá, found in other parts of the Eastern Hills of Bogotá, the Ocetá Páramo and many other locations, such as the Piedras del Tunjo in the Eastern Ranges.[4][6]

At present, the Guadalupe Group in the anticlinals of Zipaquirá and Nemocón contains rock salt. These halite deposits are not originally deposited in the Late Cretaceous Guadalupe Group, yet are allochtonous diapirs formed when the Jurassic-Lower Cretaceous normal faults were reactivated as reverse faults during the mayor Miocene tectonic movements of the Eastern Ranges.[7] The salt had been deposited during the Early Cretaceous (Valanginian-Barremian, approximately 135 to 125 Ma),[8] intruding into the overlying formations of the Upper Cretaceous.[9]

PanoramaEdit

The Cerro de Águilas on the Ocetá Páramo is composed of sediments belonging to the Guadalupe Group

See alsoEdit

ReferencesEdit

  1. ^ a b Montoya Arenas & Reyes Torres, 2005, p.37
  2. ^ Guerrero Uscátegui, 1992, p.4
  3. ^ Guerrero Uscátegui, 1992, p.5
  4. ^ a b Montoya Arenas & Reyes Torres, 2005, pp.38-50
  5. ^ Villamil, 2012, p.164
  6. ^ Plancha 227, 1998
  7. ^ Montoya Arenas & Reyes Torres, 2005, p.98
  8. ^ Guerrero Uscátegui, 1993, p.12
  9. ^ García & Jiménez, 2016, p.24

BibliographyEdit

  • García González, Mario; Ricardo Mier Umaña; Luis Enrique Cruz Guevara, and Mauricio Vásquez. 2009. Informe Ejecutivo - evaluación del potencial hidrocarburífero de las cuencas colombianas, 1-219. Universidad Industrial de Santander.
  • García, Helbert, and Giovanny Jiménez. 2016. Structural analysis of the Zipaquirá Anticline (Eastern Cordillera, Colombia). Boletín de Ciencias de la Tierra, Universidad Nacional de Colombia 39. 21-32.
  • Guerrero Uscátegui, Alberto Lobo. 1993. Informe sobre la Cuenca Petrolífera de la Sabana de Bogotá, Colombia, 1–29.
  • Guerrero Uscátegui, Alberto Lobo. 1992. Geología e Hidrogeología de Santafé de Bogotá y su Sabana, 1–20. Sociedad Colombiana de Ingenieros.
  • Montoya Arenas, Diana María, and Germán Alfonso Reyes Torres. 2005. Geología de la Sabana de Bogotá, 1–104. INGEOMINAS.
  • Villamil, Tomas. 2012. Chronology Relative Sea Level History and a New Sequence Stratigraphic Model for Basinal Cretaceous Facies of Colombia, 161–216. Society for Sedimentary Geology (SEPM).

MapsEdit

External linksEdit