Lithotectonic units in the Golconda allochthon, Nevada
- Stanford Univ., CA (United States)
- Geological Survey, Menlo Park, CA (United States)
The Golconda allochthon can be divided into several regional lithotectonic units. Each consists of an imbricate thrust stack of similar, but variably deformed, depositional sequences and represents a paleogeographic-depositional province of the basin(s) that existed prior to the Sonoma orogeny. At least four lithotectonic units are recognized. (1) An eastern unit consists of Upper Mississippian( ) to Middle Pennsylvanian chert, Middle Pennsylvanian to Lower Permian argillite and calcarenite turbidites, and Permian phosphatic sandstones, calcarenites, and chert. (2) The second unit consists of Middle Pennsylvanian greenstone, Middle Pennsylvanian to Lower Permian argillite and minor chert, middle Leonardian calcarenite, upper Leonardian chert and minor phosphatic, chert- and volcanic-lithic-rich sandstone, and Upper Permian sponge spicule chert turbidites. (3) The third unit consists of Lower Mississippian basalts, Upper Mississippian to Middle Pennsylvanian clastic rocks and radiolarian chert, and Lower Permian calcarenites and calcareous sandstone. (4) The fourth unit consists of Mississippian to permian volcaniclastic rock-bearing sections. Units 1, 2 and 3 have rocks indicating they were deposited within or adjacent to the continental margin. Rocks in unit 4 have a volcanic terrane affinity. In each lithotectonic unit the youngest rocks of Leonardian or Guadalupian age are involved n the deformation and are conformable or paraconformable on older rocks indicated the shortening history in the allochthon is entirely post-deposition and represents a short-lived Permian-Triassic event.
- OSTI ID:
- 5170881
- Report Number(s):
- CONF-9103128-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:2; Conference: American Association of Petroleum Geologists (AAPG)/Society of Economics, Paleontolgists, and Mineralogists (SEPM)/Society of Exploration Geophysicists (SEG)/Society of Professional Well Log Analysts (SPWLA) Pacific Section annual meeting, Bakersfield, CA (United States), 6-8 Mar 1991; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sedimentology and tectonics of Devonian Nation River Formation, Alaska, part of yet another allochthonous terrane
Tectonic implications of newly documented early( ) through late Paleozoic age strata, Black Rock Desert region, northwest Nevada
Related Subjects
NEVADA
SEDIMENTARY BASINS
GEOLOGIC HISTORY
TECTONICS
SEDIMENTARY ROCKS
DEPOSITION
CARBONIFEROUS PERIOD
DEFORMATION
GEOLOGIC FAULTS
GEOLOGIC FORMATIONS
LITHOLOGY
PERMIAN PERIOD
PETROLOGY
DEVELOPED COUNTRIES
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
NORTH AMERICA
PALEOZOIC ERA
ROCKS
USA
580000* - Geosciences