Matthew Horstwood

British Geological Survey

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Randall R. Parrish

University of Portsmouth

Nick M.W. Roberts

British Geological Survey

Vanessa Pashley

King's College Hospital

Daniel J. Condon

British Geological Survey

M. P. Searle

Memorial University of Newfoundland

David J. Waters

University of Oxford

Martin J. Whitehouse

Swedish Museum of Natural History

R. R. Parrish

University of Portsmouth

Robert J. Thomas

Council for Geoscience

John M. Cottle

University of California, Santa Barbara

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British Geological Survey

University of Nottingham

University of Oxford

Natural Environment Research Council

The Open University

Durham University

University of Cambridge

King's College Hospital

University of Leicester

University of Bristol

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Development of a Correlated Fe‐Mn Crust Stratigraphy Using Pb and Nd Isotopes and Its Application to Paleoceanographic Reconstruction in the Atlantic

Paleoceanography and Paleoclimatology (2020)

Pierre Josso Matthew Horstwood Ian Millar Vanessa Pashley Paul Lusty

Abstract Eight ferromanganese crust samples spanning the complete depth range of Tropic Seamount in the northeast Atlantic were analyzed for Pb and Nd isotopes to reconstruct water mass origin and mixing over the last 75 Ma. Pb isotopes were determined by laser ablation multicollector inductively coupled plasma mass spectrometer (LA‐MC‐ICP‐MS), which enables the rapid production of large, high spatial resolution data sets. This makes it possible to precisely correlate stratigraphy between different samples, compare contemporaneous layers, and create a composite record given the abundance of hiatuses in crusts. Pb and Nd isotope data show the influence of various oceanic and continental end‐members in the northeast Atlantic Ocean. This reflects its evolution from a restricted, isolated basins in the Late Cretaceous with influxes from the Tethys Ocean, to an increasingly well‐mixed, large‐scale basin, with a dominant Southern Ocean signature until the Miocene. Less radiogenic Nd isotope signatures suggest Labrador Sea Water influenced the northeast Atlantic basin as early as 17–15 Ma, flowing through a northern route such as the Charlie‐Gibbs Fracture Zone. Pb and Nd isotopes highlight the increasing influence of Saharan eolian dust input about 7 Ma, imparting a less radiogenic excursion to the binary mixing between North Atlantic water masses and riverine discharge from West and Central Africa. This highlights the influence of eolian dust input on the open ocean Pb and Nd budget and supports an early stage of North African aridification in the Late Miocene. This signature is overprinted about 3 Ma to the present by a strong North Atlantic Deep Water signature following the onset of Northern Hemisphere glaciation.

Radiogenic nuclide

Geochronology

Isotope Geochemistry

Isotopic signature

10.1029/2020pa003928

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Empirical Constraints on Extrusion Mechanisms Derived From Pressure-Temperature-Time Histories From the Himalayan Metamorphic Core (Sutlej Valley, NW India)

AGUFM (2007)

Jennifer Chambers Mark J. Caddick Tom Argles Matthew Horstwood Nigel Harris

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A new method for analysing thin (≥2μm) zircon rims by LA-ICP-MS

GeCAS (2008)

John M. Cottle R. R. Parrish Matthew Horstwood

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In-situ zircon U–Pb, oxygen and hafnium isotopic evidence for magma mixing and mantle metasomatism in the Tuscan Magmatic Province, Italy

Earth and Planetary Science Letters (2011)

D. Gagnevin J. Stephen Daly Matthew Horstwood Martin J. Whitehouse

Igneous differentiation

10.1016/j.epsl.2011.02.039

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The age and degree of diachroneity of India-Asia collision determined from the sedimentary record: a comparison of new evidence from the east (Tibet) and west (Ladakh) of the orogen

Yani Najman MK Boudagher-Fadel Laurent Godin R. Parrish Paul R. Bown

The age and degree of diachroneity of India-Asia collision is critical to construction of models of orogenesis and to understanding the causes of spatial variations in Himalayan evolution along strike. The age of collision is quoted between 65-34 Ma (Jaeger et al 1989; Aitchison et al 2007) and the degree of dichroneity is considered negligible (Searle et al 1997) to substantial (Rowley 1998). We studied the youngest Tethyan succession in the east (Tingri, Tibet) and west (Ladakh, India) of the orogen and used two approaches to date collision: 1) timing of closure of Tethys, by dating the youngest marine strata and 2) first evidence of Asian detritus deposited on the Indian plate, using U-Pb ages of detrital zircon to assess provenance. Both these approaches provide a minimum age to collision. In Ladakh, Indian plate passive margin limestones of the Paleocene Dibling Fm are overlain by the youngest marine facies of the region, the marine Kong Fm and fluvio-deltaic Chulung La Fm (Garzanti et al 1987). The age of the Kong and Chulung La Formations is disputed, from P5/6 (Fuchs & Willems 1990) to P8 (Garzanti et al 1987) the discrepancy possibly the result of research at different locations. Provenance is considered to be either ophiolitic from the Indian plate (Fuchs & Willems 1990) or containing detritus from the Trans-Himalayan arc of the Asian plate (Garzanti et al 1987; Critelli & Garzanti 1994). Our samples from the Kong Fm contained planktic foraminifera indicating a Middle to Early P6 age (54-56 Ma) and larger benthic foraminifera indicating Middle SBZ8 age (53-54 Ma). U-Pb dating of detrital zircons allows discrimination between Asian provenance (dominated by Mesozoic grains from the Trans-Himalayan arc) and Indian provenance (characterized by Precambrian grains and an absence of Mesozoic grains). Our data from the Kong and Chulung La Fms shows a primary provenance from the Asian plate. Thus collision is constrained by arrival of Asian detritus on the Indian plate by 54 Ma. In Tingri, Tibet, Indian plate passive margin limestones of the Zephure Shan Fm extend to the early Eocene, overlain by marine facies of the Pengqu Fm. The youngest marine facies have been dated at 34 Ma (Wang et al. 2002), but this age is disputed by other workers who assign an age of 50 Ma (Zhu et al. 2005). Our new biostratigraphic data from the Pengqu Fm show that calcareous nannofossil species are compatible with an age corresponding to Zones NP11-12 (50.6-53.5 Ma). The dominant population of detrital zircons have Cretaceous-Paleocene ages, derived from the Asian plate, thus indicating that contact between India and Asia had occurred by this time. We therefore conclude that India-Asia collision occurred by 54 Ma in the west, with only extremely limited, if any diachroneity eastward.

Detritus

continental collision

Collision zone

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Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and northern Madagascar

Precambrian Research (2011)

Bert De Waele Ronald J. Thomas P.H. Macey Matthew Horstwood Robert D. Tucker

Dharwar Craton

Geochronology

10.1016/j.precamres.2011.04.004

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Citations (64)

New directions in LA-ICP-MS U-(Th-)Pb geochronology (Invited)

AGU Fall Meeting Abstracts (2009)

Matthew Horstwood

Geochronology

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The source of granitic gneisses and migmatites in the Antarctic Peninsula: a combined U–Pb SHRIMP and laser ablation Hf isotope study of complex zircons

Contributions to Mineralogy and Petrology (2006)

Michael J. Flowerdew Ian Millar Alan P. M. Vaughan Matthew Horstwood C. Mark Fanning

Migmatite

10.1007/s00410-006-0091-6

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Citations (168)

An integrated in-situ O, U-Pb and Hf isotope approach to decipher the petrogenetic evolution of granites

Geochimica et Cosmochimica Acta (2007)

Sarah Appleby Martin R. Gillespie R. W. Hinton G. J. H. Oliver Matthew Horstwood

DECIPHER

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Changing provenance areas of the Cenozoic Central Myanmar Basin sediments discriminated using Hf values of detrital zircons

EGU General Assembly Conference Abstracts (2010)

Cynthia A. Brezina R. A. J. Robinson R. R. Parrish Matthew Horstwood Michael I. Bird

(1) School of Geography & Geosciences, University of St Andrews, St Andrews, United Kingdom (rajr@st-andrews.ac.uk, +44 1334 463949), (2) NERC Isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth, Nottingham, UK, (3) School of Earth and Environmental Sciences, James Cook University, Carins, Queensland, Australia , (4) Department of Geography, University of Pyay, Pyay, Myanmar, (5) Department of Geology, University of Mandalay, Mandalay, Myanmar

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