Part A. Integrated Mesozoic biochronology and magnetochronology. Part B. Studies of Cretaceous black shales
Thesis/Dissertation
·
OSTI ID:6449007
In Part A, an integrated Mesozoic timescale has been constructed combining the biochronology of numerous fossil groups and magnetochronology. The nannofossil biostratigraphy of numerous European and DSDP sections with magnetostratigraphic control has been investigated and the results enable direct biostratigraphic correlation of Chrons CMO to CM22. In most cases nannofossil stratigraphy resembles previously proposed zonations. A new, higher resolutions nannofossil biostratigraphy is proposed for the Jurassic-Cretaceous boundary interval consisting of six zones, eleven subzones and 48 biohorizons in an interval previously divided into six zones. Part B concerns the paleoceanography, biostratigraphy and geochemistry of Middle Cretaceous black shale. Transition metal accumulation rates have been estimated for Aptian-Cenomanian DSDP intervals and are higher than in most Holocene environments. Possible reasons for these high rates include hydrothermal input, precipitation of metal sulfides in a euxinic water column or diagenetic enrichment. The nannofossil biostratigraphy of Cenomanian-Turonian boundary sequences has been studied and a higher resolution zonation proposed. This zonation is used to compare lithologic variability, the timing of black shale deposition and of carbon isotopic excursions in different sequences. Nannofossil assemblages and preservation change markedly in the Cenomanian-Turonian boundary interval.
- Research Organization:
- California Univ., San Diego (USA)
- OSTI ID:
- 6449007
- Country of Publication:
- United States
- Language:
- English
Similar Records
High resolution stratigraphy at the Cenomanian/Turonian boundary and the timing of paleoceanographic events
Oceanwide anoxia in the early Aptian
Cenomanian-Turonian oceanic anoxic event: Local perturbations on a global theme
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6649789
Oceanwide anoxia in the early Aptian
Conference
·
Tue May 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:6742260
Cenomanian-Turonian oceanic anoxic event: Local perturbations on a global theme
Conference
·
Thu Dec 31 23:00:00 EST 1987
·
OSTI ID:6639169
Related Subjects
04 OIL SHALES AND TAR SANDS
040201* -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
BITUMINOUS MATERIALS
BLACK SHALES
BOUNDARY CONDITIONS
CARBON
CARBONACEOUS MATERIALS
CHATTANOOGA FORMATION
CHEMISTRY
CRETACEOUS PERIOD
DEPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FOSSILS
FUELS
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
GEOPHYSICAL SURVEYS
JURASSIC PERIOD
MAGNETIC SURVEYS
MATERIALS
MESOZOIC ERA
METALS
MINERAL RESOURCES
NONMETALS
OIL SHALE DEPOSITS
OIL SHALES
ORGANIC COMPOUNDS
RESOURCES
STRATIGRAPHY
SURVEYS
TRANSITION ELEMENTS
040201* -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
BITUMINOUS MATERIALS
BLACK SHALES
BOUNDARY CONDITIONS
CARBON
CARBONACEOUS MATERIALS
CHATTANOOGA FORMATION
CHEMISTRY
CRETACEOUS PERIOD
DEPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FOSSILS
FUELS
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
GEOPHYSICAL SURVEYS
JURASSIC PERIOD
MAGNETIC SURVEYS
MATERIALS
MESOZOIC ERA
METALS
MINERAL RESOURCES
NONMETALS
OIL SHALE DEPOSITS
OIL SHALES
ORGANIC COMPOUNDS
RESOURCES
STRATIGRAPHY
SURVEYS
TRANSITION ELEMENTS