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Title: Identification of Milankovitch Signals in Middle Triassic Platform carbonate cycles using a super-resolution spectral technique

Abstract

The Middle Triassic Latemar carbonate buildup of the Dolomites (northern Italy) contains 500 meter-scale cycles (average 0.65 m/cycle) each composed of subtidal deposits overlain by a thin vadose diagenetic cap. The cycles record depositional and early diagenetic responses to glacio-eustatic sea level oscillations with superimposed -- 20,000 year and -- 100,000 year periodicities. Previously, documentation of these Milankovitch periodicities was limited to autocorrelation analyses of truncated sequences (i.e. less than or equal to 45 consecutive cycles) of cycle thicknesses and modeling sedimentation dynamics. To improve the resolution and statistical measure of nonrandom variability in cycle thicknesses, the authors approach Latemar cyclicity using a spectral technique that produces super-resolution spectra of discrete time series. The technique differs from other spectrum estimation procedures in that the time series is ''multitapered'' as a consequence of expanding its Fourier transform by an ordered set of spheroidal functions. The resulting high-resolution spectrum estimates have a greatly enhanced statistical stability that permits the detection of extremely narrow-band signals in noisy data sets that are likely to be missed by traditional spectral analysis. The application of this multitapering algorithm on 140 consecutive Latemar cycles reveals nine statistically significant harmonies controlling cycle development, all with periodicities corresponding tomore » those of Berger's modeled series for the Earth's orbital eccentricity and axial tilt. The authors believe this to be the first report of evidence for multiple, superimposed high-resolution Milankovitch spectra in the pre-Pleisocene shallow marine, platform carbonate record.« less

Authors:
;
Publication Date:
OSTI Identifier:
6591669
Report Number(s):
CONF-880301-
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting of the American Association of Petroleum Geologists, Houston, TX, USA, 20 Mar 1988
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; CARBONATE ROCKS; SEDIMENTATION; DOLOMITE; NATURAL GAS DEPOSITS; COMPUTERIZED SIMULATION; PETROLEUM DEPOSITS; SOURCE ROCKS; ALGORITHMS; CATAGENESIS; DEPOSITION; EXPLORATION; GEOLOGIC MODELS; PETROLEUM GEOLOGY; PLEISTOCENE EPOCH; SPECTRA; TRIASSIC PERIOD; ALKALINE EARTH METAL COMPOUNDS; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; CENOZOIC ERA; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGY; MAGNESIUM CARBONATES; MAGNESIUM COMPOUNDS; MATHEMATICAL LOGIC; MESOZOIC ERA; MINERAL RESOURCES; MINERALS; OXYGEN COMPOUNDS; QUATERNARY PERIOD; RESOURCES; ROCKS; SEDIMENTARY ROCKS; SIMULATION; 020200* - Petroleum- Reserves, Geology, & Exploration; 030200 - Natural Gas- Reserves, Geology, & Exploration; 990220 - Computers, Computerized Models, & Computer Programs- (1987-1989)

Citation Formats

Hinnov, L, and Goldhammer, R K. Identification of Milankovitch Signals in Middle Triassic Platform carbonate cycles using a super-resolution spectral technique. United States: N. p., 1988. Web.
Hinnov, L, & Goldhammer, R K. Identification of Milankovitch Signals in Middle Triassic Platform carbonate cycles using a super-resolution spectral technique. United States.
Hinnov, L, and Goldhammer, R K. 1988. "Identification of Milankovitch Signals in Middle Triassic Platform carbonate cycles using a super-resolution spectral technique". United States.
@article{osti_6591669,
title = {Identification of Milankovitch Signals in Middle Triassic Platform carbonate cycles using a super-resolution spectral technique},
author = {Hinnov, L and Goldhammer, R K},
abstractNote = {The Middle Triassic Latemar carbonate buildup of the Dolomites (northern Italy) contains 500 meter-scale cycles (average 0.65 m/cycle) each composed of subtidal deposits overlain by a thin vadose diagenetic cap. The cycles record depositional and early diagenetic responses to glacio-eustatic sea level oscillations with superimposed -- 20,000 year and -- 100,000 year periodicities. Previously, documentation of these Milankovitch periodicities was limited to autocorrelation analyses of truncated sequences (i.e. less than or equal to 45 consecutive cycles) of cycle thicknesses and modeling sedimentation dynamics. To improve the resolution and statistical measure of nonrandom variability in cycle thicknesses, the authors approach Latemar cyclicity using a spectral technique that produces super-resolution spectra of discrete time series. The technique differs from other spectrum estimation procedures in that the time series is ''multitapered'' as a consequence of expanding its Fourier transform by an ordered set of spheroidal functions. The resulting high-resolution spectrum estimates have a greatly enhanced statistical stability that permits the detection of extremely narrow-band signals in noisy data sets that are likely to be missed by traditional spectral analysis. The application of this multitapering algorithm on 140 consecutive Latemar cycles reveals nine statistically significant harmonies controlling cycle development, all with periodicities corresponding to those of Berger's modeled series for the Earth's orbital eccentricity and axial tilt. The authors believe this to be the first report of evidence for multiple, superimposed high-resolution Milankovitch spectra in the pre-Pleisocene shallow marine, platform carbonate record.},
doi = {},
url = {https://www.osti.gov/biblio/6591669}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

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