Citation:

23231

Name: (Table 1) Age control for magnetic reversals in ODP Hole 138-853B
Published: 1999
License: https://creativecommons.org/licenses/by/3.0/

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Published: 1999 (exact date unknown) • DOI registered: 2011-11-09

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Abstract:

The Messinian salinity crisis is widely regarded as one of the most dramatic episodes of oceanic change of the past 20 or so million years (Hsü et al., 1973, doi:10.1038/242240a0; Ryan et al., 1973, doi:10.2973/dsdp.proc.13.1973; Hilgen et al., 1995, doi:10.1016/0012-821X(95)00207-S). Earliest explanations were that extremely thick evaporites were deposited in a deep and desiccated Mediterranean basin that had been repeatedly isolated from the Atlantic Ocean (Ryan et al., 1973, doi:10.2973/dsdp.proc.13.1973; Hilgen et al., 1995, doi:10.1016/0012-821X(95)00207-S), but elucidation of the causes of the isolation - whether driven largely by glacio-eustatic or tectonic processes - have been hampered by the absence of an accurate time frame. Here we present an astronomically calibrated chronology for the Mediterranean Messinian age based on an integrated high-resolution stratigraphy and 'tuning' of sedimentary cycle patterns to variations in the Earth's orbital parameters. We show that the onset of the Messinian salinity crisis is synchronous over the entire Mediterranean basin, dated at 5.96 +/- 0.02 million years ago. Isolation from the Atlantic Ocean was established between 5.59 and 5.33 million years ago, causing a large fall in Mediterranean water level followed by erosion (5.59-5.50 million years ago) and deposition (5.50–5.33 million years ago) of non-marine sediments in a large 'Lago Mare' (Lake Sea) basin. Cyclic evaporite deposition is almost entirely related to circum-Mediterranean climate changes driven by changes in the Earth's precession, and not to obliquity-induced glacio-eustatic sea-level changes. We argue in favour of a dominantly tectonic origin for the Messinian salinity crisis, although its exact timing may well have been controlled by the ~400-kyr component of the Earth's eccentricity cycle.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 7.211010 * Longitude: -109.751400

Date/Time Start: 1991-06-25T11:35:00 * Date/Time End: 1991-06-25T21:25:00

Minimum DEPTH, sediment/rock: 32.67 m * Maximum DEPTH, sediment/rock: 48.25 m

Event(s):

138-853B * Latitude: 7.211010 * Longitude: -109.751400 * Date/Time Start: 1991-06-25T11:35:00 * Date/Time End: 1991-06-25T21:25:00 * Elevation: -3715.5 m * Penetration: 72.4 m * Recovery: 77.68 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 72.4 m cored; 0 m drilled; 107.3 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Ageprofile Datum Description	Ageprof dat des		Krijgsman, Wout
2	Age model	Age model	ka	Krijgsman, Wout	derived of ODP Site 154-926
3	DEPTH, sediment/rock	Depth sed	m		Geocode – mbsf
4	Chronozone	Chronozone		Krijgsman, Wout
5	Depth, composite	Depth comp	mcd	Krijgsman, Wout
6	Age model, optional	Age model opt	ka	Krijgsman, Wout	interpolated age

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

18 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Ageprof dat des	2 Age model [ka]	3 Depth sed [m]	4 Chronozone	5 Depth comp [mcd]	6 Age model opt [ka]
LO Discoaster quinqueramus	5537	32.67	C3An.1n (y)	38.45	6020
LCO Amaurolithus amplificus	6020	38.50	C3An.1n (o)
crossover between Amaurolithus amplificus (includes transitional forms) and Triquetrorhabdulus rugosus	6897	47.80	C3An.2n (y)	43.60	6450
FO Amaurolithus amplificus	6840	48.25	C3An.2n (o)	46.50	6690