An integrated sequence stratigraphic and chronostratigraphic analysis of the Pliocene, Tiburon Basin succession, Mejillones Peninsula, Chile.

Tapia, Claudio A., Wilson, Gary S., Ishman, Scott E., Wilke, Hans G., Wartho, Jo-Anne , Winter, Diane and Martínez-Pardo, Rubén (2015) An integrated sequence stratigraphic and chronostratigraphic analysis of the Pliocene, Tiburon Basin succession, Mejillones Peninsula, Chile. Global and Planetary Change, 131 . pp. 124-147. DOI 10.1016/j.gloplacha.2015.05.005.

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Abstract

Highlights

• Tiburon Basin sedimentology indicates continental shelfal setting.
• Sequence stratigraphy denotes periodic sea-level rise and fall.
• High-resolution chronology constrains the lower section between 4.2 Ma and 2.8 Ma.
• The record is controlled in part by sea level change with orbital obliquity periods.
• A 3.2–2.9 Ma high-amplitude sea level fall is linked to global climatic cooling.

Abstract

We present new findings from Pliocene marine sediments from the Mejillones Peninsula Tiburon Basin of the northern Chile continental margin that provide constraints for the global sea level record. Sedimentologic and sequence stratigraphic studies reveal facies associations of a continental shelf setting. Textural variations indicate that coarsening and fining up of the succession are due to relative sea level rise and fall, respectively. Magnetostratigraphy was integrated with bio- and tephro- stratigraphic data to construct a record of high-resolution chronology. The age model constrains the Tiburon Basin lower section between 4.2 Ma and 2.8 Ma. The record is likely to be controlled in part by sea level change with orbital periodicities of obliquity (∼ 40 ka of frequency) and, between 3.2 Ma and 2.9 Ma a high-amplitude sea level fall is correlated to global climatic deterioration and the onset of major Northern Hemisphere glaciations.

Document Type: Article
Keywords: Pliocene; Marine sediments; Tiburon Basin; Magnetostratigraphy; Tephro-stratigraphy; Sea level
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.gloplacha.2015.05.005
ISSN: 0921-8181
Date Deposited: 09 Nov 2015 08:26
Last Modified: 09 Nov 2015 08:26
URI: http://oceanrep.geomar.de/id/eprint/30180

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