Zongo-San Gaban zone: Eocene foreland boundary of the Central Andean orogen, northwest Bolivia and southeast Peru
Journal Article
·
· Geology; (United States)
Discordant muscovite and biotite K-Ar dates of samples taken in six transects through the Cordillera Oriental of southeast Peru and northwest Bolivia, combined with /sup 40/Ar//sup 39/Ar age spectra, reveal a northwest-trending, structurally cryptic, tectonothermal zone of late Eocene age (ca. 38 Ma) that overprints Triassic and older igneous and metamorphic rocks. The zone is at least 450 km long but is less than 25 km wide; temperatures along its northeast boundary are estimated to have reached 350/sup 0/C. No Paleogene magmatism has been recognized that could account for the thermal resetting of the K-Ar isotopic system. Uplift, erosion, and southwest-verging thrusting accompanied the development of this domain, which defined the foreland boundary of the orogen prior to inception of northeast-verging Andean thrusting in Miocene time. It is proposed that this tectonothermal zone, the Zongo-San Gaban zone (ZSGZ), which involves thrusting and basement shortening, is the southerly manifestation of the Incaic compressional deformation, which produced the thin-skinned Maranon thrust and fold belt (MTFB) north of the Abancay deflection of central Peru.
- Research Organization:
- Queen's Univ., Kingston, Ontario (Canada)
- OSTI ID:
- 5334962
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 16:1; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
AGE ESTIMATION
ALKALI METALS
ANDES
ARGON
ARGON 39
ARGON 40
ARGON ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOTITE
BOLIVIA
DEVELOPING COUNTRIES
ELEMENTS
EROSION
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
GASES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOTHERMAL GRADIENTS
GROUND UPLIFT
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
LATIN AMERICA
LIGHT NUCLEI
METALS
MICA
MINERALS
MOUNTAINS
MUSCOVITE
NONMETALS
NUCLEI
OROGENESIS
PERU
POTASSIUM
RADIOISOTOPES
RARE GASES
SILICATE MINERALS
SOUTH AMERICA
STABLE ISOTOPES
TEMPERATURE GRADIENTS
YEARS LIVING RADIOISOTOPES
580100* -- Geology & Hydrology-- (-1989)
AGE ESTIMATION
ALKALI METALS
ANDES
ARGON
ARGON 39
ARGON 40
ARGON ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOTITE
BOLIVIA
DEVELOPING COUNTRIES
ELEMENTS
EROSION
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
GASES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOTHERMAL GRADIENTS
GROUND UPLIFT
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
LATIN AMERICA
LIGHT NUCLEI
METALS
MICA
MINERALS
MOUNTAINS
MUSCOVITE
NONMETALS
NUCLEI
OROGENESIS
PERU
POTASSIUM
RADIOISOTOPES
RARE GASES
SILICATE MINERALS
SOUTH AMERICA
STABLE ISOTOPES
TEMPERATURE GRADIENTS
YEARS LIVING RADIOISOTOPES