Results 51 to 60 of about 41,082 (236)

U–Pb dating and Sm–Nd isotopic analysis of granitic rocks from the Tiris Complex : new constaints on key events in the evolution of the Reguibat Shield, Mauritania [PDF]

, 2012
The Reguibat Shield of N Mauritania and W Algeria represents the northern exposure of the West African Craton. As with its counterpart in equatorial West Africa, the Leo Shield, it comprises a western Archaean Domain and an eastern Palaeoproterozoic ...
Abdouloye, T.B., Darbyshire, F., Gillespie, M., Horstwood, M.S.A., O'Connor, E.A., Pitfield, P.E.J., Schofield, D.I.   +6 more
core   +1 more source

Cordilleran Ice Sheet early deglaciation inferred from evolution of Late‐Pleistocene glacial Lake Dzulh Stun in east‐central British Columbia, Canada

Journal of Quaternary Science, EarlyView.
Abstract We document the early decay of the Late‐Pleistocene Cordilleran Ice Sheet in the central portion of the Rocky and Cariboo Mountains and the Rocky Mountain Trench in east‐central British Columbia. Glacial lakes impounded at the eastern margin of the ice sheet occupied watersheds on the west flank of the central Rocky Mountains, leaving ...
Brendan G. N. Miller, John J. Clague, Andrée Blais‐Stevens   +2 more
wiley   +1 more source

Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina

Journal of geomagnetism and geoelectricity, 1980
Palaeomagnetic data from samples collected in a rock sequence of tuffs and shales (Suri Formation), exposed in northwestern Argentina, indicate that the geomagnetic field had reversed polarity in Llanvirnian time. The samples from the top of the sequence also record, at least, an excursion of the geomagnetic field.The palaeomagnetic study carried out ...
openaire   +2 more sources

Assessing the Vulnerability of an Inuit Archaeological Site in a Changing Periglacial Environment: A Novel Multimethod Geophysical Approach in Arctic Geoarchaeology

Archaeometry, EarlyView.
ABSTRACT With northern regions warming at twice the global rate, assessing the state of archaeological sites in these areas is critically important. In this study, we used a multimethod geophysical approach (ERT, GPR, and EMI) to characterize the current geocryological conditions of an Inuit archaeological site on South Aulatsivik Island (Labrador ...
Rachel Labrie, Dominique Todisco, Najat Bhiry, Cécile Finco, Héloïg Barbel Le Page, Armelle Couillet   +5 more
wiley   +1 more source

Earth's middle age [PDF]

, 2014
This research was funded through Natural Environment Research Council (grant NE/J021822/1) and the APC was paid through the RCUK OA block grant.Earth's middle age, extending from 1.7 to 0.75 Ga, was characterized by environmental, evolutionary, and ...
Cawood, Peter Anthony, Hawkesworth, Chris   +1 more
core   +1 more source

Thorncliffe Formation: A proglacial to subglacial lacustrine basin sequence, Greater Toronto Region, Canada

Boreas, EarlyView.
Map of Lower sediment (LS) thickness is a surrogate for the distribution of Thorncliffe Formation (TF) and ~75% of TF thickness from the slope of Niagara Escarpment east to Brighton. Inset images show the LS sequence at the Don Valleys brickyards (DVBY) and undeformed TF sand and gravel (~15 m) below Newmarket Till (NT) at sites L and Co.
David R. Sharpe, Charles E. Logan, Ross D. Knight, Andre J.‐M. Pugin   +3 more
wiley   +1 more source

Topographic Development History of the Alaska Range [PDF]

, 2013
he overall goal of this project is to use variations in sediment source through time as a proxy for deciphering the uplift history of the Alaska Range (Fig. 1).
Davis, Kailyn
core  

Timing of Metamorphism and Deformation in the Neoarchean Quetico Metasedimentary Belt, Superior Craton, Constrained by Garnet Trace‐Element Mapping and Lu–Hf Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The Quetico subprovince of the Superior Province is among the largest metasedimentary belts globally and provides evidence of tectonic processes at play during the final stages of Archean cratonization. Although previous studies have shown that deformation and metamorphism of the 2.7‐Ga turbiditic protolith resulted in regional subvertical ...
Adrian G. Rehm, Antoine Godet, Doug Tinkham, Carl Guilmette, Matthijs A. Smit   +4 more
wiley   +1 more source

Boron abundance and localization in granulites and the lower continental crust [PDF]

Bulletin of the Geological Society of Finland, 1986
Fifty-five Precambrian ultramafic to felsic granulites from Pikwitonei, Westport, Adirondack Mountains, Orissa, Madras, and Minnesota and granulite xenoliths from Montana have been analyzed by Prompt Gamma Neutron Activation Analysis and alpha-track ...
M.G. Truscott, D.M. Shaw, J.J. Cramer
doaj   +1 more source

Deep structure of the Baringo Rift Basin (central Kenya) from three-dimensional magnetotelluric imaging: Implications for rift evolution [PDF]

, 2000
Three-dimensional modeling of data from 31 vertical electrical and 24 magnetotelluric soundings collected in the Baringo-Bogoria Basin (central Kenya Rift Valley) shows a thick succession of well-defined tectonostratigraphic units beneath the Recent ...
Achauer, Andrews, Beer, Beer, Bernard Le Gall, Bishop, Bosworth, Caroline Le Turdu, Chapman, Chapman, Chave, Clark, Counil, Deino, Fisher, Griffiths, Grimaud, Groom, Hautot, Hay, Hill, Jean-Jacques Tiercelin, Jiracek, Kathy Whaler, King, KRISP Working Party, Ku, La Torraca, Le Gall, Le Turdu, Mackie, Mackie, Mackie, Maguire, McConnell, Morley, Morley, Mugisha, Nicol, Nolasco, Pascal Tarits, Pickford, Renaut, Richert, Ritter, Rooney, Smith, Smith, Sophie Hautot, Swain, Swain, Swain, Tiercelin, Tiercelin, Tongue, Williams   +55 more
core   +2 more sources