Balanced cross section, kinematic deformation model, and palinspastic facies analysis for the Bogota fold belt, Eastern Cordillera, Colombia
- Univ. of Colorado, Boulder (United States)
- Univ. of Arizona, Tucson (United States)
- Cogniseis Development, Boulder, CO (United States)
The Bogota fold belt of the Eastern Cordillera, Colombia has long been considered a relatively simple zone of Tertiary-aged folding. To a large degree this picture is due to the presence of a monotonous sequence of turbidites which containes very few distinct formation boundaries useful for delineating the structural geometry. However, new surface mapping together with biostratigraphic and sequence stratigraphic zonation have been used to define a complex thrust system involving southeast vergent imbricate and duplex structures. Biozone and facies boundaries are recognizable throughout the mapped area and provide a high resolution stratigraphic template for structural analysis. The thrustbell architecture is illustrated by a 17 km long balanced cross section which has been constructed using kinematic fault bend and fault propagation fold models. The use of balanced section construction techniques has in turn allowed further refinement of the stratigraphic model and facies analysis in the palinspastic restoration. The cross section constrains an overall breakforward sequence of thrust initiation with a lower detachment in shales at the base of the Cretaceous Caqueza Group. There are a minimum of 16 major ramps through the Cretaceous section and an irregularly developed upper detachment near the top of the Caqueza Group. The deformation has resulted in a minimum of 13 km of horizontal shortening in this portion of the Eastern Cordillera.
- OSTI ID:
- 6105394
- Report Number(s):
- CONF-930306-; CODEN: AABUD2
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 77:2; Conference: International congress of the American Association of Petroleum Geologists (AAPG), Caracas (Venezuela), 14-17 Mar 1993; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
COLOMBIA
GEOLOGIC HISTORY
DEFORMATION
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
SIMULATION
CRETACEOUS PERIOD
CROSS SECTIONS
DATA ANALYSIS
GEOMORPHOLOGY
MAPPING
RESOLUTION
SHALES
STRATIGRAPHY
TERTIARY PERIOD
CENOZOIC ERA
DEVELOPING COUNTRIES
GEOLOGIC AGES
GEOLOGY
LATIN AMERICA
MESOZOIC ERA
ROCKS
SEDIMENTARY ROCKS
SOUTH AMERICA
020200* - Petroleum- Reserves
Geology
& Exploration
580000 - Geosciences