A5059306185- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Paleontology and Stratigraphy of Fossils
- Geological Studies and Exploration
- earthquake and tectonic studies
- Hydrocarbon exploration and reservoir analysis
- Geological formations and processes
- Geological and Geophysical Studies
- High-pressure geophysics and materials
- Polar Research and Ecology
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Geochemistry and Elemental Analysis
- Isotope Analysis in Ecology
- Pleistocene-Era Hominins and Archaeology
- Biocrusts and Microbial Ecology
- Lichen and fungal ecology
- Marine and environmental studies
- Paleontology and Evolutionary Biology
- Coastal and Marine Management
- Evolution and Paleontology Studies
- Indigenous Studies and Ecology
- Fish Ecology and Management Studies
- Geographic Information Systems Studies
British Antarctic Survey
2007-2017
University of Cambridge
2013-2014
Swedish Museum of Natural History
2005-2013
Natural Environment Research Council
2006-2011
Earth University
2011
University College Dublin
2000-2005
British Geological Survey
2005
King's College Hospital
2005
Research Article| March 01, 2007 Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica M.J. Flowerdew; Flowerdew 1Natural Environmental Council (NERC) Isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK Search for other works by this author on: GSW Google Scholar I.L. Millar; Millar M.L. Curtis; Curtis 2British Antarctic Survey, High Cross,...
New geological mapping combined with U–Pb ion microprobe zircon geochronology on the isolated but locally extensive exposures of crystalline basement inliers eastern Graham Land has greatly improved our understanding region’s early crustal evolution and allowed a more thorough evaluation Patagonia–Antarctic Peninsula connections prior to Gondwana break-up. At Eden Glacier, diorite gneisses yield Early Ordovician protolith ages 487 ± 3 485 Ma represent oldest in situ rocks recorded Antarctic...
Late tectonic granitoids that cut a deformed sequence of volcanic and sedimentary rocks (Tha'lab Group) comprising the Al Mukalla terrane have been investigated by whole rock major trace element geochemistry, Sm-Nd feldspar Pb isotope compositions, U-Pb zircon geochronology. The 696 ± 12 Ma age determined for one such intrusion, granite, demonstrates arc had formed juxtaposed with Azania Mahfid before ca. 700 Ma. Its eNdt value −0.2 elevated values collectively indicate involvement some...
The Amlah terrane, northwest Yemen, comprises a suite of calc-alkaline tonalitic to granodioritic gneisses bounded by mafic volcanic and likely ophiolites. Occupying key location between the largely juvenile arc terranes Saudi Arabian Shield their correlatives in NW Yemen west continentally influenced central east, it allows evaluation models for final assembly Shield. A field, geochemical, isotopic geochronological study was undertaken order constrain evolution terrane its tectonic setting....
The middle Miocene climate optimum (c. 14.2 to 13.8 Ma), a significant warm period, was followed by series of step-wise global cooling and Antarctic ice-sheet expansion events visible in marine isotope records (e.g., Holbourn et al., 2013), the oldest which is termed mid-Miocene transition. Associated episodes instability iceberg calving are recorded ice-rafted debris mid- high-latitude sediment, accessible via deep-sea sediment cores around margin. Paleo-ice sheet models indicate that...
Feldspars are a common framework grain in sandstone reservoirs targeted for carbon capture and storage (CCS). They mechanically weak under reservoir conditions very likely to react with CO2 injected into saline aquifers or depleted hydrocarbon reservoirs.  Reactions could dissolve feldspar precipitate new minerals an extent that fundamentally changes properties potentially mineralises CO2. The current general consensus is these features unlikely impact fluid migration during the...
The Tyrone Central Inlier is a metamorphic terrane of uncertain affinity situated outboard the main Dalradian outcrop (south Fair Head–Clew Bay Line) and could represent sub-arc basement to part enigmatic Midland Valley Terrane. Using combination isotopic, structural petrographic evidence, tectonothermal evolution was investigated. Sillimanite-bearing assemblages ( c . 670 °C, 6.8 kbar) leucosomes in paragneisses are cut by granite pegmatites, which post-date two deformation fabrics. yield...
Early Jurassic silicic volcanic rocks of the Chon Aike Province (V1: 187 – 182 Ma) are recognized from many localities in southern Antarctic Peninsula and NE Patagonia essentially coeval with extensive Karoo (182 Ferrar (183 large igneous provinces pre-breakup Gondwana. Until recently, plutonic this age were considered either rare or absent batholith, which was thought to have been mainly constructed during Middle mid-Cretaceous. New U–Pb zircon geochronology recently published ages...
Abstract The continental margin of Gondwana preserves a record long-lived magmatism from the Andean Cordillera to Australia. crustal blocks West Antarctica form part this margin, with Palaeozoic–Mesozoic particularly well preserved in Antarctic Peninsula and Marie Byrd Land. Magmatic events on intervening Thurston Island block are poorly defined, which has hindered accurate correlations along margin. Six samples dated here using U-Pb geochronology cover geological history Island. basement...
Abstract Field observations from the Trinity Peninsula Group at View Point on Antarctic indicate that thick, southward-younging and overturned clastic sedimentary rocks, comprising unusually coarse conglomeratic lenses within a succession of fine-grained sandstone–mudstone couplets, are deposits debris turbidity flows or foot submarine slope. Three detrital zircons couplets date deposition 302 ± 3 Ma, shortly after Carboniferous–Permian boundary. Conglomerates predominantly consist quartzite...
New analysis of the relationships between geological structural data and radiometric ages for Lassiter Coast Intrusive Suite indicate that collisional mid‐Cretaceous Palmer Land Event orogeny in Antarctic Peninsula has had two kinematic phases, forming an intersection orocline, one which can be related to Cretaceous Southern Ocean plate motions. Both are compressional phases along Eastern Shear Zone: Phase 1 occurred at ∼107 Ma with a principal paleostrain axis 341°, is best expressed...
Abstract The development of laser ablation techniques using inductively coupled plasma mass spectrometry has enabled the routine and fast acquisition in situ U–Pb Pb–Pb isotope ratio data from single detrital grains or parts grains. Detrital zircon dating is a technique that increasingly applied to sedimentary provenance studies. However, sand routing information analysis alone may be obscured by repeated reworking cycles mineral fertility variations. These biases are illustrated two clear...
New U–Pb zircon ion-microprobe ages from the alluvial conglomerates and flood plain sediments of Botany Bay Group demonstrate that sedimentation occurred at c. 167 Ma, coeval with rift-related silicic volcanism in northern Antarctic Peninsula. In contrast, southern Peninsula (Latady Basin) 183 Ma. The new data indicate syn-rift was diachronous south to north, consistent early opening Weddell Sea embayment by anti-clockwise rotation Mid-Jurassic. A definitive date for floras has important...
Abstract New feldspar lead isotope compositions of crystalline rocks from the Indian Ocean sector East Antarctica, in conjunction with review data elsewhere within continent and continents formerly adjacent Gondwana, refine boundaries evolutionary histories terranes previously inferred geological mapping complementary studies. Coastal Archaean Vestfold Napier complexes have overlapping had Pb isotopes homogenized at 2.5 Ga sourced or already fractionated protoliths high variable U–Pb....
Research Article| January 22, 2018 Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula, and correlations along Gondwana margin Teal R. Riley; Riley † 1British Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK †trr@bas.ac.uk Search for other works by this author on: GSW Google Scholar Alex Burton-Johnson; Burton-Johnson Michael J. Flowerdew; Flowerdew 2CASP (formerly known as Cambridge Arctic...
Abstract Silicic volcanism at c. 168 Ma has been identified previously on the Antarctic Peninsula, and Mapple Formation, which includes those volcanic rocks, defined documented from one area of east coast Graham Land. Based age geochemical criteria, correlations have made to extensive Chon Aike Province South America, demonstrated be largest silicic provinces in world. Rhyolitic intermediate composition successions six separate localities Peninsula are described here confirmed as...
The Antarctic Peninsula (AP) consists of a long lived and uniquely well preserved magmatic arc system. broad tectonic structure the AP is understood. However, processes occurring along are only constrained by regional geophysical relatively sparse geological data. Key questions remain about timing, volume, structural controls on magma emplacement. We present new high resolution aeromagnetic data across Adelaide Island, western margin revealing complex arc/forearc boundary. Using digital...