Browsing Geology by Author "Chew, David"
Now showing items 1-20 of 36
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A multi-radioisotope approach to dating sedimentation : applying Re-Os organic-rich shale and U-Pb authigenic xenotime dating to the Shannon and Pennine Basins
Stanislawska, Maja Anna (Trinity College (Dublin, Ireland). Department of Geology, 2013)Sedimentary rocks are the most abundant hthologies on the Earth, covering over 70% of the planet’s surface. Quantitative dating of sedimentary rocks (especially those devoid of fossils) is critical to understanding the ... -
The basement geology of the Porcupine High - a key transatlantic link between the Caledonides and Appalachians
Dennehy, Shannon Raftery (Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2023)In order to better reconstruct the basement geology of the western Irish offshore and the North Atlantic, constraining the geologic evolution of the Porcupine High region is key. Located 200 km west of Ireland, the Porcupine ... -
Basic volcanism contemporaneous with the Sturtian glacial episode in NE Scotland
Chew, David (2010)The Dalradian Supergroup contains three distinct glacigenic units, formerly termed `Boulder Beds?, which are correlated with widespread Neoproterozoic glaciations. The oldest and thickest unit, the Port Askaig Formation, ... -
Broadband Surface Wave Tomography of Ireland, Britain and Other Regions
BONADIO, RAFFAELE (Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2019)Over the last decades, seismic surface-wave studies have produced increasingly detailed images of the Earth s structure at a regional scale. In this study, we have tuned well-established techniques and when required ... -
Chemical Abrasion Applied to LA-ICP-MS U-Pb Zircon Geochronology
Crowley, Quentin; Chew, David (2014)Zircon (ZrSiO4) is the most commonly used mineral in U–Pb geochronology. Although it has proven to be a robust chronometer, it can suffer from Pb-loss or elevated common Pb, both of which impede precision and accuracy of ... -
Combined apatite fission track and U-Pb dating by LA-ICPMS and its application in apatite provenance analysis
Chew, David (Mineralogical Association of Canada Short Course (v42), 2012) -
Constructing global carboniferous climatic fluctuations using high resolution geochronology
Pointon, Michael (Trinity College (Dublin, Ireland). Department of Geology, 2012)The Carboniferous Period was a time of substantial climatic change, during which occurred the transition from a greenhouse (ice-free) environment into major continental glaciation. The onset of major Carboniferous glaciation ... -
Deciphering geochemical signals across a Cambro-Ordovician carbonate platform
COAKLEY, STEPHEN PATRICK (Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2020)Sulfur isotopes (δ34S) preserve a geological record of seawater sulfate that permit insights into biogeochemical cycling, surface redox conditions and microbial activity over geological time. However, isotopic records from ... -
Early mafic magmatism and crustal anatexis on the Isle of Rum: evidence from the Am M?m intrusion breccia
Chew, David (2009)The Rum Igneous Centre comprises two early marginal felsic complexes (the Northern Marginal Zone and the Southern Mountains Zone), along with the later central ultrabasic?basic layered intrusions. These marginal complexes ... -
Elemental and isotopic behaviour of Zn in Deccan basalt weathering profiles: Chemical weathering from bedrock to laterite and links to Zn deficiency in tropical soils
SUHR, NILS THORSTEN; Schoenberg, Ronny; Chew, David; Rosca, Carolina; Widdowson, Mike; Kamber, Balz S. (2018)Zinc (Zn) is a micronutrient for organisms and essential for plant growth, therefore knowledge of its elemental cycling in the surface environment is important regarding wider aspects of human nutrition and health. To ... -
Estimating exhumation from seismic stacking velocity data : a case study from the Slyne Basin, offshore NW Ireland
Biancotto, Frédéric (Trinity College (Dublin, Ireland). Department of Geology, 2012)Exhumation describes the vertical upward displacement of rocks due to the removal of overburden material. In this study, seismic velocity profiles from 2D and 3D seismic reflection datasets have been inverted to constrain ... -
Furthering the potential of apatite as a provenance indicator in sedimentary systems
O'SULLIVAN, GARY JOHN (Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2019)As a mineral that has only recently become possible to date routinely by the U-Pb method, apatite geochemistry (U-Pb isotopes and trace elements) has until now attracted less attention than longer-established detrital ... -
Geochronology of the Tardree Rhyolite Complex, Northern Ireland: Implications for zircon fission track studies, the North Atlantic Igneous Province and the age of the Fish Canyon sanidine standard
Chew, David (2011)The British-Irish Palaeogene Igneous Province (BIPIP) is part of the larger North Atlantic Igneous Province and includes the lava fields of Antrim, Mull, and Skye. The Tardree Rhyolite Complex (TRC) in Northern Ireland ... -
Hidden Archaean and Palaeoproterozoic crust in NW Ireland? Evidence from zircon Hf isotopic data from granitoid intrusions
Chew, David (2009)The presence of major crystalline basement provinces at depth in NW Ireland is inferred from in situ Hf isotope analysis of zircons from granitoid rocks that cut structurally overlying metasedimentary rocks. Granitoids in ... -
High temperature (>350?C) thermochronology and mechanisms of Pb loss in apatite
Chew, David (2014) -
LA-ICP-MS U-Pb apatite dating of Lower Cretaceous rocks from teschenite-picrite association in the Silesian unit (southern Poland)
Chew, David (2014)The main products of volcanic activity in the teschenite-picrite association (TPA) are shallow, sub-volcanic intrusions, which predominate over extrusive volcanic rocks. They comprise a wide range of intrusive rocks which ...