Magnetobiostratigraphy of Planktonic Foraminiferal Datums: Deep Sea Drilling Project Leg 94, North Atlantic

Weaver, P. P. E.; Clement, Bradford M.

doi:10.2973/dsdp.proc.94.120.1987

Cited by 40 publications

(42 citation statements)

References 27 publications

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“…6). This age fits remarkably well within the reported age range of 3.08 to 2.98 Ma for this datum level in magnetobiostratigraphic records from the open ocean (Hays et al, 1969;Saito et al, 1975;Mazzel et al, 1979;Keigwin, 1982b;Weaver and Clement, 1987 (Fig. 6).…”

Section: Ages Of Early Late Pliocene Bioeventssupporting

confidence: 89%

“…6). Also this age estimate compares well with the age-range of 3.10 to 2.85 Ma for the LOD of Globoquadrma alt~splra in the open ocean (Hays et al, 1969;Saito et al, 1975;Mazzei et al, 1979;Orr and Jenkins, 1980;Keigwm, 1982b;Weaver and Clement, 1987 (Weaver and Clement, 1987). In the Mediterranean, Globorotalia punct~culata also arrives in the Nunivak subchron at 4.13 Ma (Zijderveld et al, 1986), but without Globorotaha crassaformts, which enters the Mediterranean not before 3.40 Ma.…”

Section: Ages Of Early Late Pliocene Bioeventssupporting

confidence: 79%

See 1 more Smart Citation

Early Late Pliocene biochronology and surface water temperature variations in the Mediterranean

Zachariasse¹,

Zijderveld²,

Langereis³

et al. 1989

Marine Micropaleontology

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A high-resolution magnetoblostratlgraphy is presented for the early Late Phocene m Sicily Paleomagnetm measurements on samples from 100 stratlgraphm levels provide an unprecedented high-quality polamty sequence whmh extends from the upper reversed Gilbert to the upper normal Gauss subchron. The resultant chronology for the early Late Phocene provides ages for the following principal Mediterranean bloevents: (1) FOD Globorotaha crassaformls at 3.40 Ma, (2) prolonged absence of Globorotaha punct~culata between 3.38 and 3 16 Ma, (3) LOD Uwgerma rutda at 3 16 Ma, (4) LOD Sphaero~dmellops~s semmuhna at 3.07 Ma, (5) LOD Globoquadrma altzsp~ra at 3 04 Ma and (6) LOD C~blc~des ~tahcus at 2.96 Ma.Summer and winter surface water temperature estimates for the period 3 50 to 2 92 Ma are based on the abundances of Glob~germo~des saccuhfer and Globorotaha punctwulata m 111 samples with an average resolutmn of some 5000 years Short-term varmtmns m temperature of the surface water and m colour and carbonate content of the sediment are primarily controlled by the equmoxal precession A higher seasonahty during deposltmn of the grey-coloured, carbonate-poor facms suggests that at that time the summer solstice occurred near penhehon, whereas an reverse ahgnment occurred at the time of deposltmn of whlte-coloured, carbonate-inch layers Thin phase-relatmnshlp between the precessmn cycle and grey-coloured layers is also vahd for the sapropels whmh began to intercalate m the grey-coloured layers at 2 94 Ma Long-term changes m surface water temperatures include a warmmg between 3 38 and 3 18 Ma followed by a coohng from 3 18 to 3 03 Ma. The warming of Mediterranean surface waters at 3 38 Ma is beheved to be assocmted w~th the final closure of the Isthmus of Panama. Consequent strengthening of the Gulf Stream rejected larger volumes of warm surface water into the North Atlantm Drift and eastern boundary current and thin caused surface water temperatures m the mid to high-latitude northeast Atlantic and Mediterranean to rose. The subsequent chmatm coohng at 3 18 Ma is hnked to a first stage of Northern Hemmphere continental me growth.

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Section: Ages Of Early Late Pliocene Bioeventssupporting

confidence: 89%

Section: Ages Of Early Late Pliocene Bioeventssupporting

confidence: 79%

Early Late Pliocene biochronology and surface water temperature variations in the Mediterranean

Zachariasse¹,

Zijderveld²,

Langereis³

et al. 1989

Marine Micropaleontology

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“…The intensification of the AMOC is also in concert with the disappearance of N. atlantica (sin.) in the Mediterranean Sea and the North Atlantic up to at least 52 • N after ∼ 2.4 Ma (Lourens and Hilgen, 1997;Weaver and Clement, 1987). This suggests the reduction in southward protrusion of colder water masses and hence the N. atlantica (sin.)…”

Section: Did Mow Contribute To the Early Pleistocene Climate Transition?mentioning

confidence: 98%

Mediterranean Outflow Water variability during the Early Pleistocene

2017

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Abstract. Gaining insights into the evolution of Mediterranean Outflow Water (MOW) during the Early Pleistocene has been so far hampered by the lack of available palaeoclimatic archives. Here we present the first benthic foraminifera stable oxygen and carbon isotope records and grain-size data from IODP Expedition 339 Site U1389 presently located within the upper core of the MOW in the Gulf of Cadiz for the time interval between 2.6 and 1.8 Ma. A comparison with an intermediate water mass record from the Mediterranean Sea strongly suggest an active MOW supplying Site U1389 on glacial-interglacial timescales during the Early Pleistocene. We also find indication that the increasing presence of MOW in the Gulf of Cadiz during the investigated time interval aligns with the progressive northward protrusion of Mediterranean sourced intermediate water masses into the North Atlantic, possibly modulating the intensification of the North Atlantic Meridional Overturning Circulation at the same time. Additionally, our results suggest that MOW flow strength was already governed by precession and semi-precession cyclicity during the Early Pleistocene against the background of glacial-interglacial variability.

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“…F7). Because FOs and LOs of planktonic foraminifers are diachronous across the temperate to subpolar North Atlantic (Weaver and Clement, 1987; Spencer-Cervato and Thierstein, 1997), we did not assign absolute ages to these occurrences. Taxonomic concepts for Neogene taxa were adopted from Kennett and Srinivasan (1983).…”

Section: Foraminifersmentioning

confidence: 99%

“…The zonal schemes of Weaver and Clement (1987) were applied to the late Neogene and Quaternary samples of Expedition 303 (Fig. F7).…”

Section: Foraminifersmentioning

confidence: 99%

Site U1302–U1308 methods

Channell¹,

Kanamatsu²,

Sato³

et al. 2006

Proceedings of the IODP

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Magnetobiostratigraphy of Planktonic Foraminiferal Datums: Deep Sea Drilling Project Leg 94, North Atlantic

Cited by 40 publications

References 27 publications

Early Late Pliocene biochronology and surface water temperature variations in the Mediterranean

Early Late Pliocene biochronology and surface water temperature variations in the Mediterranean

Mediterranean Outflow Water variability during the Early Pleistocene

Site U1302–U1308 methods

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