Superimposed platform carbonate cycles
Conference
·
OSTI ID:6592380
The Middle Triassic Latemar carbonate buildup of the Dolomites (Italy) records high-frequency stratigraphic cyclicity (fourth and fifth order) superimposed on low-frequency (third order) cyclicity. The Latemar platform contains four facies stacked vertically: (1) lower platform facies (LPF), 250 m of subtidal grainstones with abundant early marine diagenesis, noncyclic, subaerial exposure horizons every 10-15 m; (2) lower cyclic facies (LCF), 90 m of meter-scale cycles each composed of subtidal deposits overlain by a vadose diagenetic cap; (3) tepee facies (TF), 120 m of meter-scale cycles periodically interrupted by tepee zones depicting extended subaerial exposure; (4) upper cyclic facies (UCF), 210 m of meter-scale cycles similar to the LCF. High-frequency cyclicity is represented by at least 500 meter-scale cycles (average 0.65 m/cycle) occurring within the LCF, TF, and UCF, each of which records subaerial exposure on a 10/sup 4/ year scale (approximately 20,000 years average). Five meter-scale cycles (fifth order) are grouped into asymmetric megacycles (fourth order). This 5:1 ratio of the superimposed high-frequency orders and the asymmetry of the 10/sup 5/ year fluctuation are predicted by a Milankovitch glacio-eustatic mechanism. Lower frequency cyclicity (third order) is expressed by the Latemar facies succession (LPF in equilibrium LCF in equilibrium TF), which records progressive increase in platform subaerial exposure and decrease in cycle thickness, reflecting a progressive decline in relative subsidence rate.
- OSTI ID:
- 6592380
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sequence stratigraphy and systems tract development of the Latemar platform, Middle Triassic of the dolomites: Outcrop calibration keyed by cycle stacking patterns
Platform/foreslope facies and buildup geometry resulting from short-term and long-term eustatic sea level fluctuations: latemar buildup (Middle Triassic), Dolomites, northern Italy
Identification of Milankovitch Signals in Middle Triassic Platform carbonate cycles using a super-resolution spectral technique
Conference
·
Thu Feb 28 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:5739498
Platform/foreslope facies and buildup geometry resulting from short-term and long-term eustatic sea level fluctuations: latemar buildup (Middle Triassic), Dolomites, northern Italy
Conference
·
Fri May 01 00:00:00 EDT 1987
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:6221073
Identification of Milankovitch Signals in Middle Triassic Platform carbonate cycles using a super-resolution spectral technique
Conference
·
Thu Dec 31 23:00:00 EST 1987
·
OSTI ID:6591669
Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
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& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CATAGENESIS
DOLOMITE
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGY
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MESOZOIC ERA
MINERAL RESOURCES
MINERALS
NATURAL GAS DEPOSITS
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
STRATIGRAPHY
TRIASSIC PERIOD
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CATAGENESIS
DOLOMITE
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGY
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MESOZOIC ERA
MINERAL RESOURCES
MINERALS
NATURAL GAS DEPOSITS
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
STRATIGRAPHY
TRIASSIC PERIOD