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Evidence of precessional and eccentricity orbital cycles in a Tithonian source rock: The mid-outer carbonate ramp of the Vaca Muerta Formation, northern Neuquén Basin, Argentina.

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Kietzmann, Diego A. and Martín Chivelet, Javier and Palma, Ricardo Manuel and López Gómez, José and Lescano, Marina and Concheyro, Andrea (2011) Evidence of precessional and eccentricity orbital cycles in a Tithonian source rock: The mid-outer carbonate ramp of the Vaca Muerta Formation, northern Neuquén Basin, Argentina. AAPG bulletin, 95 (9). pp. 1459-1474. ISSN Online ISSN 1558-9153 ; Print ISSN 0149-1423

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Official URL: https://www.aapg.org/publications/journals/bulletin



Abstract

Basin to mid-ramp cyclic facies of the Tithonian Vaca Muerta Formation are exposed in the Loncoche Creek section of the Neuquén Basin, Mendoza province, Argentina. This unit is characterized by a decimeter-scale rhythmic alternation of marls, shales and limestones and extends from the lower Tithonian to the upper Berriasian. Cyclostratigraphic studies based on a detailed facies analysis allowed the identification of cyclic patterns with frequencies within the Milankovitch band. According to biostratigraphic data, the dominant cycle in the studied section has a period of 20 k.y., which correlates with the Earth’s axis precession element. Spectral analysis based on a series of compacted and decompacted cycle thick-ness identified a subordinate frequency of about 90 to 120 k.y., which we interpret as the modulation of the precessional cycle caused by the Earth’s orbital eccentricity. The strength of the precession signal, together with the absence of a well-defined cyclicity attributable to the obliquity orbital cycle (i.e., ∼40 k.y.), is in agreement with previous data from the Northern Hemisphere.


Item Type:Article
Uncontrolled Keywords:Vaca Muerta Formation; Argentina
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:58051
Deposited On:11 Dec 2019 08:59
Last Modified:11 Dec 2019 11:32

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