Eustatic signals in deep-marine sedimentary sequences recovered at ODP Site 978, Alboran Basin, western Mediterranean Sea

Marsaglia, KM; Fukusawa, H; Cornell, WC; Skilbeck, CG; Meyers, PA; Prasad, M; Klaus, A

Eustatic signals in deep-marine sedimentary sequences recovered at ODP Site 978, Alboran Basin, western Mediterranean Sea

Marsaglia, KM Fukusawa, H Cornell, WC Skilbeck, CG

Meyers, PA Prasad, M Klaus, A

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Publication Type:: Journal Article
Citation:: Journal of Sedimentary Research, 2004, 74 (3), pp. 378 - 390
Issue Date:: 2004-05-01

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Field	Value	Language
dc.contributor.author	Marsaglia, KM	en_US
dc.contributor.author	Fukusawa, H	en_US
dc.contributor.author	Cornell, WC	en_US
dc.contributor.author	Skilbeck, CG https://orcid.org/0000-0003-1634-963X	en_US
dc.contributor.author	Meyers, PA	en_US
dc.contributor.author	Prasad, M	en_US
dc.contributor.author	Klaus, A	en_US
dc.date.issued	2004-05-01	en_US
dc.identifier.citation	Journal of Sedimentary Research, 2004, 74 (3), pp. 378 - 390	en_US
dc.identifier.issn	1527-1404	en_US
dc.identifier.uri	http://hdl.handle.net/10453/656
dc.description.abstract	A continuous section of Pliocene marine sediments was recovered at Ocean Drilling Program Site 978, located in the Alboran Sea between Spain and Morocco. Three Pliocene subunits have been defined at Site 978: the lowermost (Subunit IC, 129.2 m thick) is characterized by alternating beds of lighter, more calcareous, and darker less calcareous, claystone with bioturbated upper and lower contacts (Type 1 cycles); the middle (Subunit 1B, 67.1 m thick) is composed of relatively homogeneous nannofossil claystone; and the uppermost (Subunit IA, 211.6 m thick) contains abrupt-based darker, terrigenous layers interpreted as turbidites that are interstratified with lighter nannofossil claystone (Type 2 cycles). The rhythmically bedded light and dark layers in Subunit IC correlate with those in the Rosello Composite Section of Sicily, a global reference standard for the Pliocene time scale. These sedimentary cycles are products of variations in precession and resulting continental runoff. Missing cycles occur during eustatic highstands. The shift to more homogeneous sedimentation in Subunit IB is represented in similar-aged sequences throughout the Mediterranean which display evidence of submarine mass wasting. Mediterranean-wide slope degradation was likely a response to rapid sea-level change at approximately 3 Ma. This change in sedimentation style was accompanied by an upsection increase in sediment accumulation rates associated with turbidite influx in Subunit IA. Turbidite frequency throughout the Pliocene section can be linked to eustatic changes in sea level, with turbidite maxima corresponding with mid-sequence downlap surfaces and their associated condensed sections. © 2004, SEPM (Society for Sedimentary Geology).	en_US
dc.relation.ispartof	Journal of Sedimentary Research	en_US
dc.relation.isbasedon	10.1306/092403740378	en_US
dc.subject.classification	Geology	en_US
dc.title	Eustatic signals in deep-marine sedimentary sequences recovered at ODP Site 978, Alboran Basin, western Mediterranean Sea	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	74	en_US
utslib.for	0403 Geology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Research)
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	74	en_US

Abstract:

A continuous section of Pliocene marine sediments was recovered at Ocean Drilling Program Site 978, located in the Alboran Sea between Spain and Morocco. Three Pliocene subunits have been defined at Site 978: the lowermost (Subunit IC, 129.2 m thick) is characterized by alternating beds of lighter, more calcareous, and darker less calcareous, claystone with bioturbated upper and lower contacts (Type 1 cycles); the middle (Subunit 1B, 67.1 m thick) is composed of relatively homogeneous nannofossil claystone; and the uppermost (Subunit IA, 211.6 m thick) contains abrupt-based darker, terrigenous layers interpreted as turbidites that are interstratified with lighter nannofossil claystone (Type 2 cycles). The rhythmically bedded light and dark layers in Subunit IC correlate with those in the Rosello Composite Section of Sicily, a global reference standard for the Pliocene time scale. These sedimentary cycles are products of variations in precession and resulting continental runoff. Missing cycles occur during eustatic highstands. The shift to more homogeneous sedimentation in Subunit IB is represented in similar-aged sequences throughout the Mediterranean which display evidence of submarine mass wasting. Mediterranean-wide slope degradation was likely a response to rapid sea-level change at approximately 3 Ma. This change in sedimentation style was accompanied by an upsection increase in sediment accumulation rates associated with turbidite influx in Subunit IA. Turbidite frequency throughout the Pliocene section can be linked to eustatic changes in sea level, with turbidite maxima corresponding with mid-sequence downlap surfaces and their associated condensed sections. © 2004, SEPM (Society for Sedimentary Geology).

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http://hdl.handle.net/10453/656