The Astronomical Theory of Climatic Change: Barbados Data

Mesolella, Kenneth J.; Matthews, R. K.; Broecker, Wallace S.; Thurber, David L.

doi:10.1086/627434

Cited by 429 publications

(180 citation statements)

References 25 publications

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“…Past sea level estimates from ␣-counted 230 Th dates on raised coral terraces from Barbados supported the Milankovitch hypothesis on the relation between glacier ice volume and insolation (Broecker et al, 1968;Mesolella et al,1969). Later, more precise and accurate thermal ionization mass spectrometry (TIMS) confirmed this result in a variety of locations (Edwards et al, 1987a,b;Gallup et al, 1994;Muhs et al, 1994;Stirling et al, 1995;Szabo et al, 1994).…”

Section: Introductionmentioning

confidence: 85%

U-Th dating of deep-sea corals

Cheng

Adkins

Edwards

et al. 2000

Geochimica et Cosmochimica Acta

217

162

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Abstract- 230 Th, 232 Th, 234 U and 238 U compositions of several deep-sea solitary corals, mainly the species Desmophyllum cristagalli, were determined by thermal ionization mass spectrometry (TIMS). It is possible to obtain high precision ages on modern pristine corals that have low [ 232 Th] (5 to a few hundred ppt). However, because older deep-sea corals tend to have higher [ 232 Th] compared to surface corals, and the initial 230 Th/ 232 Th ratio is uncertain, older deep-sea corals have larger age uncertainties (Ϯseveral hundred years for samples with a few thousand ppt 232 Th). Therefore, the key hurdle for precise U-Th dating is to remove or account for contaminants which contain elevated 232 Th and associated 230 Th not due to closed system decay within the coral lattice. A modification of the trace metal cleaning methods used for foraminifera and surface corals can significantly reduce this contamination. By counting the visible growth bands and measuring the mean age of a single septum, the extension rate of D. cristagalli was estimated to be between 0.1 and 3.1 mm/year. In a mean sense, bands appear to be precipitated annually, but this estimate has a large uncertainty. If appropriate tracer calibrations can be established, these corals are therefore suitable to record decadal or sub-decadal oceanographic changes over the course of their lifetime. The ␦ 234 U values of all modern samples from different localities and different depths are similar (mean 145.5 Ϯ 2.3‰) and indistinguishable from the data obtained from surface corals. At a precision of about Ϯ2‰, we find no structure in the oceanic profile of ␦ 234 U ratios over the top 2000 m of the water column.

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Section: Introductionmentioning

confidence: 85%

U-Th dating of deep-sea corals

Cheng

Adkins

Edwards

et al. 2000

Geochimica et Cosmochimica Acta

217

162

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“…First, data for the last few hundred thousand years show that vertical tectonic movements have been not oscillatory, but unidirectional (Bloom et at., 1974;Ghani, 1974Ghani, , 1978Lensen and Vella, 1971;Mesolella et at., 1969). Second, glacio-eustatic sea-level changes certainly must have affected all sedimentation close to sea-level (terrestrial or marine) during the Quaternary Period.…”

Section: Conditions Of Depositionmentioning

confidence: 99%

Hautotara, Te Muna and Ahiaruhe Formations, middle to late Pleistocene, Wairarapa, New Zealand.

Collen¹,

Vella

1984

Journal of the Royal Society of New Zealand

109

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The Hautotara, Te Muna and Ahiaruhe Formations are formally described for the first time. The Hautotara Formation contains the littoral marine and estuarine deposits of the Huangarua Cyclothem together with underlying freshwater deposits which have been added for mapping convenience, and is considered to be late Marahauan (c. 1.2 to 1.05 Myr) in age. The Te Muna Formation is a conformable sequence, 366 m thick, containing fifteen members. Alluvial gravels alternate with freshwater blue-grey silt and sand with lignite layers, tree roots in growth position and occasional paleosols. The Te Muna Formation also contains loess at one horizon, and localised rhyolitic tephra beds. The tephras and preliminary paleomagnetism indicate a Castlecliffian age (c. 1.0 to 0.4 Myr). The Ahiaruhe Formation consists of alluvial gravel varying from a few metres to more than 80 m in thickness, interbedded with water-laid, partly loessic silts locally containing Mount Curl Tephra (c. 0.23 ± 0.04 Myr; equals Ahiaruhe Tephra). It has a tilted but still well-defined depositional surface at the top forming terraces, and passes laterally westward to thick blue-grey lacustrine silt with a moa footprint and also containing Mount Curl Tephra. The tephra indicates an age greater than 0.2 Myr for the the base of the Ahiaruhe Formation and less than 0.26 Myr for the top. Kawakawa Tephra in overlying loess indicates an age greater than 0.02 Myr. The three formations correspond to most of the time represented by the late Nukumaruan Stage, Castlecliffian Stage and early Hawera Series. We infer that their deposition was controlled by climatic fluctuations and associated glacioeustatic sea-level changes coincident with Milankovitch cycles, superimposed on secular vertical tectonic movements.

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“…Here, they cite a recent paper (Gusev and Molodkov, 2012) on substage 5a whereas a considerable number of papers have previously been published on this period. Among them, the paper by of TIMS U-series coral dates from Barbados is of particular interest since they show that MIS 5a may actually consist of two distinct high stands one of which is Their assertion that, "Shorelines related to other substages of MIS 5 can only be seen in areas with fast tectonic uplift", is not accurate as MIS 5 sea-levels are readily observed at moderately uplifting areas such as Barbados (Broecker et al, 1968;Mesolella et al, 1969;Gallup et al, 1994) and Haiti (Dodge et al, 1983;Dumas et al, 2006). Dogan et al frequently refer to a paper by Schellmann et al (2004), and in section 5.1, "MIS 5a and 3 shorelines on the Samandagı coasts" they state: "The numerical ESR-OS ages indicate that in the Eastern Mediterranean, the MIS 5a sealevel high stand occurred at about 72 ka, which is comparable to those on Barbados dated to 74 ka by ESR on corals."…”

Section: Previous Resultsmentioning

confidence: 99%

Comment on “MIS 5a and MIS 3 relatively high sea-level stands on the Hatay-Samandağı coast, Eastern Mediterranean, Turkey”. U. Doğan, A. Koçyiğit, B. Varol, İ. Özer, A. Molodkov, E. Zöhra. Quaternary International (2012), 262, 65–79

Bekaroğlu

2012

Quaternary International

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The Astronomical Theory of Climatic Change: Barbados Data

Cited by 429 publications

References 25 publications

U-Th dating of deep-sea corals

U-Th dating of deep-sea corals

Hautotara, Te Muna and Ahiaruhe Formations, middle to late Pleistocene, Wairarapa, New Zealand.

Comment on “MIS 5a and MIS 3 relatively high sea-level stands on the Hatay-Samandağı coast, Eastern Mediterranean, Turkey”. U. Doğan, A. Koçyiğit, B. Varol, İ. Özer, A. Molodkov, E. Zöhra. Quaternary International (2012), 262, 65–79

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