Solimoes megashear: Intraplate tectonics in northwestern Brazil
- Petroleo Brasileiro S.A.-Petrobras, Belem, Para (BRAZIL)
A belt of deformation in the Solimoes basin of northwestern Brazil extends east-northeast from near the Peruvian border for about 1300 km. The belt is characterized by the en echelon arrangement of folds and faults interpreted as the result of right-slip displacements in a transpressive regime. The structures were formed during Late Jurassic time, probably due to collision of South America with allochthonous terranes as the opening of the South Atlantic Ocean began. The Iquitos arch near the western end of the megashear separates the Solimoes basin from Subandean basins. The development of the Iquitos arch is interpreted to be related to orogenic loading along western South America by the Andean mountain belt. In Brazil, folds and faults associated with the Solimoes megashear hold hydrocarbons within Paleozoic strata, and 15 gas and oil fields have so far been discovered.
- OSTI ID:
- 5629425
- Journal Information:
- Geology; (USA), Journal Name: Geology; (USA) Vol. 19:3; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
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ATLANTIC OCEAN
BRAZIL
DEFORMATION
DEVELOPING COUNTRIES
DIMENSIONS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FORMATIONS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRATA
GEOLOGIC STRUCTURES
GEOLOGY
HYDROCARBONS
JURASSIC PERIOD
LATIN AMERICA
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
OIL FIELDS
ORGANIC COMPOUNDS
ORIGIN
OROGENESIS
PALEOZOIC ERA
PETROLEUM DEPOSITS
PLATE TECTONICS
RESOURCES
SEAS
SEDIMENTARY BASINS
SOUTH AMERICA
STRATIGRAPHY
SURFACE WATERS
TECTONICS