A5107656345- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Geophysics and Gravity Measurements
- Geological and Geophysical Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Offshore Engineering and Technologies
- Geological Studies and Exploration
- Geomagnetism and Paleomagnetism Studies
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Drilling and Well Engineering
- Reservoir Engineering and Simulation Methods
- Geological Modeling and Analysis
- Seismic Imaging and Inversion Techniques
- Geological formations and processes
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
Cardiff University
2014-2024
Natural History Museum
2023-2024
University of Wales Institute Cardiff
2023
International Ocean Discovery Program
2015
University Hospital of Wales
2014
Universidad Complutense de Madrid
2007
British Geological Survey
2000-2006
Durham University
1991-2000
Graphic Science (United Kingdom)
1992
United States Geological Survey
1992
Granites may be subdivided according to their intrusive settings into four main groups—ocean ridge granites (ORG), volcanic arc (VAG), within plate (WPG) and collision (COLG)—and the each group further precise petrological characteristics. Using a data bank containing over 600 high quality trace element analyses of from known settings, it can demonstrated using ORG-normalized geochemical patterns element-SiO2 plots that most these granite groups exhibit distinctive Discrimination ORG, VAG,...
Brachiopods are (perhaps all too) familiar to any geology student who has taken an invertebrate paleontology course; they may well be less biology students. Even though brachiopods among the most significant components of marine fossil ...Read More
Granitic rocks can have a wide range of sources, over all parts the spectrum from pure mantle to crust. These sources show significant correlation with tectonic setting. Granites ocean ridges usually characteristics that indicate depleted sources. in volcanic arcs modified by component subducted oceanic crust and sediment. intraplate settings evidence enriched (lithosphere andlor asthenosphere) together rare crustal melts. syn-collision are characterised or containing large components....
Summary This paper reports the results of a systematic geochemical study intermediate and acid intrusive rocks from number continent-continent collision zones Phanerozoic age. Four groups intrusions can be recognized, each associated with particular stage in tectonic evolution zone. Pre-collision calc-alkaline (volcanic-arc) which are mostly derived mantle modified by subduction component characterized selective enrichments LIL elements. Syn-collision peraluminous (leucogranites) may...
Summary Supra-subduction zone (SSZ) ophiolites have the geochemical characteristics of island arcs but structure oceanic crust and are thought to formed by sea-floor spreading directly above subducted lithosphere. They differ from ‘MORB’ not only in their geochemistry also more depleted nature mantle sequences, common presence podiform chromite deposits, crystallization clinopyroxene before plagioclase which is reflected high abundance wehrlite relative troctolite cumulate sequences. Most...
Many diagrams conventionally used to classify igneous rocks utilize mobile elements, which commonly renders them unreliable for classifying from the geological record. The K2O–SiO2 diagram, subdivide volcanic arc into rock type (basalts, basaltic andesites, dacites and rhyolites) series (tholeiitic, calc-alkaline, high-K calc-alkaline shoshonitic), is particularly susceptible effects of alteration. However, by using Th as a proxy K2O Co SiO2 it possible construct topologically similar...
A new ICP‐MS database for glasses from the Mariana Trough, together with published and data arc, provides basis geochemical mapping of arc‐basin system. The maps presented here are based on graphic representation spatial variations in proxies principal mantle subduction components. focus is three elements high similar partition coefficients but different behavior systems, namely, Ba, Th, Nb. Two coefficients, Ta Yb, used as normalizing factors. Ratio (Ta/Yb, Nb/Ta, Th/Ta, Ba/Ta, Ba/Th)...
Abstract Understanding mantle melting above subduction zones requires an evaluation of the behaviour elements for which contribution greatly exceeds any contribution. In this paper we present a compilation partition coefficients suite these (Nb, Zr, Y, Yb, Ca, Al, Ga, V, Sc, Fe, Mn, Co, Cr, Mg, Ni) temperatures 1200–1300°C, oxygen fugacities QFM ± 1 and sub-alkaline compositions. These yield good-fit depletion trends abyssal, orogenic trench-wall peridotites. Modelling pooled melts from...
Research Article| April 01, 2014 Immobile Element Fingerprinting of Ophiolites Julian A. Pearce *School Earth and Ocean Sciences, Cardiff University, CF10 3AT, UKE-mail: PearceJA@cardiff.ac.uk Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Mineralogical Society America First Online: 09 Mar 2017 Online ISSN: 1811-5217 Print 1811-5209 © the Elements (2014) 10 (2): 101–108. https://doi.org/10.2113/gselements.10.2.101 history Cite View This...
This paper develops methods for using the integrated study of Hf-Nd element and isotope covariations to define nature provenance mantle subduction inputs systems. In particular, it can be demonstrated that (1) space permits discrimination between Pacific Indian provenance, (2) displacements from arrays on trace projections related magnitude, source composition input, (3) used interpret high field strength (HFSE) anomalies [specifically, Hf extended rare earth (REE) patterns] in...
The volcanoes of the South Sandwich island arc follow three distinct series: low-K tholeiitic (followed by Zavodovski, Candlemas, Vindication, Montagu and Bristol), Visokoi, Saunders Bellinghausen) calcalkaline Leskov, Freehand part Cook Thule). Flux calculations indicate that percentage contribution subduction component to mantle source all series varies from undetectable (e.g. Zr) through small Nd=20%) moderate La, Ce, Sr=50–80%) dominant Pb, K, Ba, Rb, Cs >90%) with little change along...