Conall Mac Niocaill

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High northern geomagnetic field behavior and new constraints on the Gilsá event: Paleomagnetic and 40Ar/39Ar results of ∼0.5–3.1 Ma basalts from Jökuldalur, Iceland

Arne Døssing, Adrian R. Muxworthy, Radchagrit Supakulopas, Morten S. Riishuus, more

Earth and Planetary Science Letters > 2016 > 456 > C > 98-111

Recent paleomagnetic results of extrusive rocks from high southern latitudes (>60°S) and high northern latitudes (>60°N) have been suggested to reflect a hemispheric asymmetry of the geomagnetic field on time-scales of 10⁵ to 10⁶ yrs, with higher and more stable fields in the north. This interpretation, however, is based on only a few modern-standard paleodirectional data sets and on high northern...

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Long duration (>4 Ma) and steady-state volcanic activity in the early Cretaceous Paraná–Etendeka Large Igneous Province: New palaeomagnetic data from Namibia

Sarah C. Dodd, Conall Mac Niocaill, Adrian R. Muxworthy

Earth and Planetary Science Letters > 2015 > 414 > Complete > 16-29

There is long-standing correlation between Large Igneous Provinces (LIPs) and major mass extinction events in the Geological Record, postulated to be due to the emission of large quantities of volcanic gases over a geologically short period of time causing major climatic perturbations within the Earth system. The ∼135 Ma Paraná–Etendeka volcanic province of Brazil and Namibia represents something...

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Phanerozoic polar wander, palaeogeography and dynamics

Trond H. Torsvik, Rob Van der Voo, Ulla Preeden, Conall Mac Niocaill, more

Earth-Science Reviews > 2012 > 114 > 3-4 > 325-368

A significant number of new palaeomagnetic poles have become available since the last time a compilation was made (assembled in 2005, published in 2008) to indicate to us that a new and significantly expanded set of tables with palaeomagnetic results would be valuable, with results coming from the Gondwana cratonic elements, Laurentia, Baltica/Europe, and Siberia. Following the Silurian Caledonian...

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Rapid directional changes associated with a 6.5kyr-long Blake geomagnetic excursion at the Blake–Bahama Outer Ridge

Mark Bourne, Conall Mac Niocaill, Alex L. Thomas, Mads Faurschou Knudsen, more

Earth and Planetary Science Letters > 2012 > 333-334 > Complete > 21-34

Geomagnetic excursions are recognized as intrinsic features of the Earth's magnetic field. High-resolution records of field behaviour, captured in marine sedimentary cores, present an opportunity to determine the temporal and geometric character of the field during geomagnetic excursions and provide constraints on the mechanisms producing field variability. We present here the highest resolution record...

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Corrigendum: A well‐established Early–Middle Pleistocene marine sequence on south‐east Zakynthos island, western Greece: magneto‐biostratigraphic constraints and palaeoclimatic implications

Maria D. Papanikolaou, Maria V. Triantaphyllou, Ellen S. Platzman, Philip L. Gibbard, more

Journal of Quaternary Science > 26 > 7 > 767 - 767

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Large tectonic rotations in a wide zone of Neogene distributed dextral shear, northeastern South Island, New Zealand

Karen Randall, Simon Lamb, Conall Mac Niocaill

Tectonophysics > 2011 > 509 > 3-4 > 165-180

The New Zealand plate-boundary zone in the northern part of South Island, New Zealand, comprises a series of active dextral strike-slip faults, referred to as the Marlborough Fault Zone (MFZ), which link oblique continental convergence farther south, along the Alpine Fault, to subduction of the Pacific plate along the Hikurangi margin. New paleomagnetic data are presented which, together with previous...

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A well‐established Early–Middle Pleistocene marine sequence on south‐east Zakynthos island, western Greece: Magneto‐biostratigraphic constraints and palaeoclimatic implications

Maria D. Papanikolaou, Maria V. Triantaphyllou, Ellen S. Platzman, Philip L. Gibbard, more

Journal of Quaternary Science > 26 > 5 > 523 - 540

The chronostratigraphy of a long, onshore Early–Middle Pleistocene marine sedimentary sequence on the south‐east part of Zakynthos island, Greece, is presented. Correlation of the succession with the isotope record of Ocean Drilling Program Site 963 reveals the combined influence of tectonics and eustacy in this area. The sequence is divided into three formations by two main unconformities that apparently...

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Emplacement temperatures of pyroclastic and volcaniclastic deposits in kimberlite pipes in southern Africa

Giovanni Fontana, Conall Mac Niocaill, Richard J. Brown, R. Stephen J. Sparks, more

Bulletin of Volcanology > 2011 > 73 > 8 > 1063-1083

Palaeomagnetic techniques for estimating the emplacement temperatures of volcanic deposits have been applied to pyroclastic and volcaniclastic deposits in kimberlite pipes in southern Africa. Lithic clasts were sampled from a variety of lithofacies from three pipes for which the internal geology is well constrained (the Cretaceous A/K1 pipe, Orapa Mine, Botswana, and the Cambrian K1 and K2 pipes,...

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Palaeogeographic implications of differential inclination shallowing in permo-carboniferous sediments from the donets basin, Ukraine

Alexandr G. Iosifidi, Conall Mac Niocaill, Alexei N. Khramov, Mark J. Dekkers, more

Tectonophysics > 2010 > 490 > 3-4 > 229-240

We present new palaeomagnetic data from Upper Carboniferous and Lower Permian grey and red sediments from the Donets Basin, Ukraine, part of the Palaeozoic East European Platform. Detailed demagnetization of these units reveals two ancient components of magnetization: component “B”, which is carried by magnetite and pigmentary haematite, and a high unblocking temperature component “C”, present only...

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Paleomagnetic determination of emplacement temperatures of pyroclastic deposits: an under-utilized tool

Greig A. Paterson, Andrew P. Roberts, Conall Mac Niocaill, Adrian R. Muxworthy, more

Bulletin of Volcanology > 2010 > 72 > 3 > 309-330

Paleomagnetic data from lithic clasts collected from Mt. St. Helens, USA, Volcán Láscar, Chile, Volcán de Colima, Mexico and Vesuvius, Italy have been used to determine the emplacement temperature of pyroclastic deposits at these localities and to highlight the usefulness of the paleomagnetic method for determining emplacement temperatures. At Mt. St. Helens, the temperature of the deposits (T _dep...

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In-phase anomalies in Beryllium-10 production and palaeomagnetic field behaviour during the Iceland Basin geomagnetic excursion

Mads Faurschou Knudsen, Gideon M. Henderson, Martin Frank, Conall Mac Niocaill, more

Earth and Planetary Science Letters > 2008 > 265 > 3-4 > 588-599

Increases in the production rate of cosmogenic radionuclides associated with geomagnetic excursions have been used as global tie-points for correlation between records of past climate from marine and terrestrial archives. We have investigated the relative timing of variations in ¹⁰ Be production rate and the corresponding palaeomagnetic signal during one of the largest Pleistocene excursions,...

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High-resolution data of the Iceland Basin geomagnetic excursion from ODP sites 1063 and 983: Existence of intense flux patches during the excursion?

Mads Faurschou Knudsen, Conall Mac Niocaill, Gideon M. Henderson

Earth and Planetary Science Letters > 2006 > 251 > 1-2 > 18-32

Based on discrete samples, we report new high-resolution records of the ∼ 185 kyr Iceland Basin (IB) geomagnetic excursion from Ocean Drilling Project (ODP) Site 1063 on the Bermuda Rise (sedimentation rate 32 cm kyr ⁻¹ ) and from ODP Site 983 in the far North Atlantic (sedimentation rate 18 cm kyr ⁻¹ ). Two records from Holes 1063A and 1063B are very consistent, and provide the highest...

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Preface

Conall Mac Niocaill, Trond Torsvik, Ben van der Pluijm

Tectonophysics > 2003 > 362 > 1-4 > vii-x

article

Rob Van der Voo-an appreciation

Conall Mac Niocaill, Trond Torsvik, Ben van der Pluijm

Tectonophysics > 2003 > 362 > 1-4 > xi-xii

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True polar wander during the Permo ^T riassic

Maria C. Marcano, Rob Van der Voo, Conall Mac Niocaill

Journal of Geodynamics > 1999 > 28 > 2-3 > 75-95

The apparent polar wander path for the Pangea supercontinent is about 35 ^o long for the interval of 295-205Ma, which means that in that interval Pangea rotated over an angle of 35 ^o with respect to the rotation axis about an Euler pole located at the equator. If the rest of the world, largely comprised of the Panthalassa Ocean, rotated about the same Euler pole in the same sense as...

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The Proterozoic supercontinent Rodinia: paleomagnetically derived reconstructions for 1100 to 800 Ma

Arlo B. Weil, Rob Van der Voo, Conall Mac Niocaill, Joseph G. Meert

Earth and Planetary Science Letters > 1998 > 154 > 1-4 > 13-24

Well-dated paleomagnetic poles for the interval 1100-800 Ma have been compiled for the Laurentia, Baltica, Sao Francisco, Congo and Kalahari cratons in order to construct apparent polar wander paths (APWPs) for this interval. Laurentia's APWP consists of a well-determined Keweenawan track for 1100-1000 Ma and a 1000-800 Ma Grenville loop. We use a counterclockwise APW loop for the Grenville poles...

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Late Cenozoic magnetostratigraphy (11 – 0 Ma) of the Dongshanding and Wangjiashan sections in the Longzhong Basin, western China

Ji-Jun Li, Xiao-Min Fang, Rob Van der Voo, Jun-Jie Zhu, more

Geologie en Mijnbouw > 1997 > 76 > 1-2 > 121-134

A paleomagnetic study of the 510-m-thick Wangjiashan section of Late Miocene and Pliocene terrestrial sediments reveals a fairly complete reversal record with ages from 11 to 1.8 Ma. The magnetostratigraphy of the Dongshanding section, located nearby, reveals a partially overlapping reversal record with ages from 2.2 to 0 Ma, and facilitates correlation of the Wangjiashan section with the global polarity...

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A record of the Blake Event during the last interglacial paleosol in the western Loess Plateau of China

Xiao-Min Fang, Ji-Jun Li, Rob Van der Voo, Conall Mac Niocaill, more

Earth and Planetary Science Letters > 1997 > 146 > 1-2 > 73-82

A high-resolution record of the Blake Event has been obtained from a 40 m well dug in a loess section at Jiuzhoutai in the City of Lanzhou in the western Loess Plateau of China. The paleomagnetic signal is principally carried by magnetite both in loess and paleosols. The Blake Event is located at the boundary between paleosol S1-c of the last interglacial (equivalent to MIS 5e in deep-sea records)...

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Search results for: Conall Mac Niocaill

High northern geomagnetic field behavior and new constraints on the Gilsá event: Paleomagnetic and 40Ar/39Ar results of ∼0.5–3.1 Ma basalts from Jökuldalur, Iceland

Long duration (>4 Ma) and steady-state volcanic activity in the early Cretaceous Paraná–Etendeka Large Igneous Province: New palaeomagnetic data from Namibia

Phanerozoic polar wander, palaeogeography and dynamics

Rapid directional changes associated with a 6.5kyr-long Blake geomagnetic excursion at the Blake–Bahama Outer Ridge

Corrigendum: A well‐established Early–Middle Pleistocene marine sequence on south‐east Zakynthos island, western Greece: magneto‐biostratigraphic constraints and palaeoclimatic implications

Large tectonic rotations in a wide zone of Neogene distributed dextral shear, northeastern South Island, New Zealand

A well‐established Early–Middle Pleistocene marine sequence on south‐east Zakynthos island, western Greece: Magneto‐biostratigraphic constraints and palaeoclimatic implications

Emplacement temperatures of pyroclastic and volcaniclastic deposits in kimberlite pipes in southern Africa

Palaeogeographic implications of differential inclination shallowing in permo-carboniferous sediments from the donets basin, Ukraine

Paleomagnetic determination of emplacement temperatures of pyroclastic deposits: an under-utilized tool

In-phase anomalies in Beryllium-10 production and palaeomagnetic field behaviour during the Iceland Basin geomagnetic excursion

High-resolution data of the Iceland Basin geomagnetic excursion from ODP sites 1063 and 983: Existence of intense flux patches during the excursion?

Preface

Rob Van der Voo-an appreciation

True polar wander during the Permo ^T riassic

The Proterozoic supercontinent Rodinia: paleomagnetically derived reconstructions for 1100 to 800 Ma

Late Cenozoic magnetostratigraphy (11 – 0 Ma) of the Dongshanding and Wangjiashan sections in the Longzhong Basin, western China

A record of the Blake Event during the last interglacial paleosol in the western Loess Plateau of China

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