When the Ice Melts: A New Perspective on the Causes of Quaternary Glacial Terminations

DQPB: software for calculating disequilibrium U-Pb ages

T Pollard, J Woodhead, J Hellstrom, J Engel, R Powell, R Drysdale

2023-04-20

Initial radioactive disequilibrium amongst intermediate nuclides of the U decay chains can have a significant impact on the accura..

New chronological constraints from hypogean deposits for late pliocene to recent morphotectonic history of the alpi apuane (NW Tuscany, Italy)

I Isola, F Mazzarini, G Molli, L Piccini, E Zanella, G Zanchetta, R Drysdale, J Hellstrom, J Woodhead, A Roncioni, F Milazzo, D Pieruccioni, E Regattieri

2021-02-01

A sedimentary sequence of fluvial deposits preserved in the Corchia Cave (Alpi Apuane) provides new chronological constraints for ..

Magnesium in subaqueous speleothems as a potential palaeotemperature proxy

R Drysdale, I Couchoud, G Zanchetta, I Isola, E Regattieri, J Hellstrom, A Govin, PC Tzedakis, T Ireland, E Corrick, A Greig, H Wong, L Piccini, P Holden, J Woodhead

2020-12-01

Few palaeoclimate archives beyond the polar regions preserve continuous and datable palaeotemperature proxy time series over multi..

Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition

P Bajo, RN Drysdale, JD Woodhead, JC Hellstrom, D Hodell, P Ferretti, AHL Voelker, G Zanchetta, T Rodrigues, E Wolff, J Tyler, S Frisia, C Spötl, AE Fallick

2020-03-13

Radiometric dating of glacial terminations over the past 640,000 years suggests pacing by Earth's climatic precession, with each g..

Most Earth-surface calcites precipitate out of isotopic equilibrium

M Daëron, RN Drysdale, M Peral, D Huyghe, D Blamart, TB Coplen, F Lartaud, G Zanchetta

2019-12-01

Oxygen-isotope thermometry played a critical role in the rise of modern geochemistry and remains extensively used in (bio-)geoscie..

Speleothem U/Th age constraints for the Last Glacial conditions in the Apuan Alps, northwestern Italy

I Isola, A Ribolini, G Zanchetta, M Bini, E Regattieri, RN Drysdale, JC Hellstrom, P Bajo, P Montagna, E Pons-Branchu

2019-03-15

During the Quaternary several glaciations occurred in the mountain regions around the Mediterranean and, in recent years, new ages..

Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution

Petra Bajo, Andrea Borsato, Russell Drysdale, Quan Hua, Silvia Frisia, Giovanni Zanchetta, John Hellstrom, Jon Woodhead

2017-08-01

In this study, the ‘dead carbon proportion’ (DCP) calculated from combined U-Th and radiocarbon analyses was used to explore the c..

Environmental variability between the penultimate deglaciation and the mid Eemian: Insights from Tana che Urla (central Italy) speleothem trace element record

E Regattieri, G Zanchetta, RN Drysdale, I Isola, JD Woodhead, JC Hellstrom, B Giaccio, A Greig, I Baneschi, E Dotsika

2016-11-15

A trace element record (Mg, Sr, Ba, Al, Si, P, Y, Zn) covering the ca. 133 ka to ca. 124 ka time interval was acquired from a flow..

"Cryptic" diagenesis and its implications for speleothem geochronologies

Petra Bajo, John Hellstrom, Silvia Frisia, Russell Drysdale, Jay Black, Jon Woodhead, Andrea Borsato, Giovanni Zanchetta, Malcolm W Wallace, Eleonora Regattieri, Ralf Haese

2016-09-15

Speleothems are usually considered as one of the most amenable palaeoclimate archives for U-series dating. A number of studies in ..

A continuous stable isotope record from the penultimate glacial maximum to the Last Interglacial (159-121ka) from Tana Che Urla Cave (Apuan Alps, central Italy)

E Regattieri, G Zanchetta, RN Drysdale, I Isola, JC Hellstrom, A Roncioni

2014-01-01

Relatively few radiometrically dated records are available for the central Mediterranean spanning the marine oxygen isotope stage ..

Lateglacial to Holocene trace element record (Ba, Mg, Sr) from Corchia Cave (Apuan Alps, central Italy): Paleoenvironmental implications

E Regattieri, G Zanchetta, RN Drysdale, I Isola, JC Hellstrom, L Dallai

2014-01-01

In this study, Mg/Ca, Sr/Ca and Ba/Ca ratios in a Lateglacial to Holocene stalagmite (CC26) from Corchia Cave (central Italy) are ..

High-resolution U-Pb dating of an Early Pleistocene stalagmite from Corchia Cave (central Italy)

P Bajo, R Drysdale, J Woodhead, J Hellstrom, G Zanchetta

2012-12-01

Recent developments in the uranium-lead (U-Pb) dating of speleothems have opened up new opportunities in palaeoclimate research. A..

Precise microsampling of poorly laminated speleothems for U-series dating

RN Drysdale, BT Paul, JC Hellstrom, I Couchoud, A Greig, P Bajo, G Zanchetta, I Isola, C Spötl, I Baneschi, E Regattieri, JD Woodhead

2012-12-01

One of the principal reasons why speleothems are recognised as important palaeoclimate archives is their suitability for accurate ..

U and Pb variability in older speleothems and strategies for their chronology

J Woodhead, J Hellstrom, R Pickering, R Drysdale, B Paul, P Bajo

2012-12-01

Speleothem proxy records, coupled with U-Th chronologies, are widely used in studies of palaeoclimate, landscape and faunal evolut..

13C18O clumping in speleothems: Observations from natural caves and precipitation experiments

M Daëron, W Guo, J Eiler, D Genty, D Blamart, R Boch, R Drysdale, R Maire, K Wainer, G Zanchetta

2011-06-15

The oxygen isotope composition of speleothems is an important proxy of continental paleoenvironments, because of its sensitivity t..