Age model of ODP Hole 107-654A
Cobertura |
LATITUDE: 40.579300 * LONGITUDE: 10.696700 * DATE/TIME START: 1986-02-03T10:40:00 * DATE/TIME END: 1986-02-08T15:15:00 |
---|---|
Data(s) |
24/09/1992
|
Resumo |
It has long been speculated that glacio-eustatic sea level drop may have caused or contributed to the isolation and consequent desiccation of the Mediterranean in the late Miocene (the 'Messinian salinity crisis'). Ocean Drilling Program site 654 on the Sardinia margin of the Tyrrhenian Sea is the first deep-sea drill site to penetrate through upper Messinian evaporites into lower Messinian/upper Tortonian open marine sediments, and thus offers a unique opportunity to date the onset of the salinity crisis. A reexamination of the magnetostratigraphic, biostratigraphic, and stable isotope-stratigraphic constraints on the preevaporite sediments of site 654 has yielded two possible ages for the contact between salinity crisis sediments and the underlying normal marine sediments. One magnetostratigraphic interpretation plus the biostratigraphically determined position of the Tortonian/Messinian boundary imply a date of about 6.2 Ma for the youngest presalinity crisis sediments. An alternative magnetostratigraphic interpretation plus the carbon isotope stratigraphy imply a date of about 5.2 Ma. The younger of these dates coincides with a delta18O spike in open ocean sediments [Keigwin, 1987 doi:10.1029/PA002i006p00639], which is attributed to increased ice volume. |
Formato |
application/zip, 2 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.728095 doi:10.1594/PANGAEA.728095 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Kastens, Kim A (1992): Did glacio-eustatic sea level drop trigger the Messinian salinity crisis? New evidence from Ocean Drilling Program Site 654 in the Tyrrhenian Sea. Paleoceanography, 7(3), 333-356, doi:10.1029/92PA00717 |
Palavras-Chave | #107-654A; Age model; Ageprof dat des; Ageprofile Datum Description; Depth; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Depth bot; Depth top; DRILL; Drilling/drill rig; FAD = first abundance datum, LAD = last abundance datum, FO = first occurrence, FOD = first occurrence datum, FCO = first common occurrence, LO = last occurrence, LOD = last occurrence datum, LCO = last common occurrence; Joides Resolution; Leg107; occurrence described by:; Ocean Drilling Program; ODP; Reference; Reference/source; Tirreno Sea |
Tipo |
Dataset |