A5039596400- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Geological formations and processes
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Paleontology and Stratigraphy of Fossils
- Geological and Geophysical Studies Worldwide
- Mineralogy and Gemology Studies
- Hydrology and Watershed Management Studies
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Geological Formations and Processes Exploration
- Hydrology and Sediment Transport Processes
- Flood Risk Assessment and Management
- Rock Mechanics and Modeling
- Granular flow and fluidized beds
- Building materials and conservation
- Fecal contamination and water quality
- Historical and Cultural Archaeology Studies
- Archaeology and ancient environmental studies
- Marine Biology and Ecology Research
- Environmental Justice and Health Disparities
National Park Service
2017-2021
New Mexico State University
2007
University of Canterbury
1992-2005
University of South Carolina
2005
University of Liverpool
1966
University of Bristol
1966
The Median Tectonic Zone in Eastern Fiordland, SW New Zealand, comprises a tectonically disrupted belt of Mesozoic magmatic arc rocks related to subduction along the palaeo-Pacific margin Gondwana. ion microprobe (SHRIMP) U–Pb zircon ages confirm that bulk plutonic eastern Fiordland range from Mid-Jurassic Early Cretaceous (168–137 Ma) age. Carboniferous age granitoids occur western side of, and within zone. Triassic appear be restricted Mid-Jurassic–Early igneous (collectively referred as...
Abstract Detailed geological mapping, petrography, geochemistry, and geochronological studies in the Hohonu Batholith, North Westland, have identified 10 granitoid plutons emplaced during three intrusive episodes. The earliest episode is represented by a single dated Paleozoic pluton, Summit Granite (new) (381.2 ± 7.3 Ma), which correlated with discrete pulse of Mid—Late Devonian plutonism recognised Karamea Batholith. undated Mount Graham also likely to be Paleozoic, based on chemical...
Abstract The Greenland Group of the Reefton area, probable pie-Devonian age, consists alternating beds indurated mudstone and sandstone, is interpreted as a turbidite succession. Sedimentary features sandstone include common graded bedding, sharp basal contacts, directional sole marks, load casts, flame structures, internal cross- parallel-laminations, top surface ripple marks. sediments cannot be differentiated on either lithology or facies from succession in Paparoa Range to west, rocks...
Abstract Intermittent floodplain channels are low‐relief conduits etched into the surface and remain dry much of year. These comprise expansive systems important because during low‐level inundation they facilitate lateral hydraulic connectivity throughout floodplain. Nevertheless, few studies have focused on these due to uncertainty in how identify characterize digital elevation models (DEMs). In particular, their automatic extraction from widely available DEMs is challenging...
Research Article| March 01, 1972 Porphyroblasts and ‘Crystallization Force’: Some Textural Criteria: Discussion DAVID SHELLEY Department of Geology, University Canterbury, Christchurch, New Zealand Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Geological Society America Received: 17 Aug 1971 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print 0016-7606 Copyright © 1972, The America, Inc. is not claimed on any material prepared U.S....
Abstract The Early Cretaceous Darran Complex of the Median Tectonic Zone near Milford, South Island, New Zealand, consists dominantly biotite ‐ two‐pyroxene diorites cut by biotite‐hornblende microdiorite and quartz monzodiorite dikes. host diorite gives a 138 ± 2.9 Ma SHRIMP age on zircons, which is interpreted to be igneous crystallisation. calc‐alkaline geochemistry microdiorites attributed melting mantle wedge source fluxed slab‐derived fluids. Ductile deformation (D1) dikes took place...
Plagioclase in quartzofeldspathic schists from New Zealand has a preferred orientation as follows: optic direction Y (approximately [001]), maximum parallel to the lineation and grain elongation and/ or girdle schistosity; Z [010]), an ac girdle; X [100]), little no orientation. Elongate albite with prominent dimensional range of length/width ratios that does not vary crystallographic indicating neither nor result plastic deformation. Grain size data are compatible rate crystallization model...
The Potrerillos minibasin of the La Popa basin, Mexico, is defined by Carroza syncline and bounded El Gordo anticline salt weld. Stratigraphic geometries facies distribution upper sandstone member Formation within indicate that diapirism, shortening, deposition were simultaneous complexly interrelated during Paleocene. a regressive succession marginal marine, siliciclastic deposits. Wave-dominated shoreface deposits consist mudstone, siltstone, are interpreted to represent offshore...
Abstract The Constant Gneiss near Charleston is very variable in composition and texture. In some parts of the area, original greywacke-mudstone type sediments are represented by migmatites which granite-gneiss layers separate more refractory hornfelsed greywacke beds. centre area particularly, intense plutonism completely melted sediments, forming a complex assemblage granitic rocks quartz diorite. Three phases structural development may be distinguished: first phase, possibly Tuhuan age,...
Abstract Recreational waters are primary attractions at many national and state parks where feral swine populations established, thus possible hotspots for visitor exposure to contaminants. Microbial source tracking (MST) was used determine spatial temporal patterns of fecal contamination in Congaree National Park (CONG) South Carolina, U.S.A., which has an established population is a popular destination water-based recreation. Water samples were collected between December 2017 June 2019...
Summary Myrmekite-like intergrowths in the Lewisian gneiss and igneous complex of Loch Borolan are described. The diverse mineral composition but have many features common with myrmekite it is shown that they result from constriction a previously existing during growth, solid state, host mineral. More than one stage intergrowth often found these stages can be correlated geological events.
Summary Zonal myrmekitic and granophyric intergrowths in plagioclase K-feldspar phenocrysts are described. There two such zones the feldspars of Late Granite, G2, but only one Early G1. The zonal end-product replacement plagioclases by K-feldspar. Transitional stages this replacement, which took place solid state, represented numerous examples. myrmekite, also represent growth occur between magmatic plagioclase, is oscillatory-zoned. It concluded that granites evolved at depth under...
This study investigates the production and distribution of ceramics across islands Hispaniola Puerto Rico during Ceramic Age (ca. 800–500 BCE to 1500 CE). The ceramic assemblage from El Frances, Dominican Republic, is analyzed compared with five other sites (Hacienda Grande, Tecla, La Gallera, Dorado-42, Sorcé). Petrographic analysis clarifies origin raw materials preparation clay body. Results show an initial phase 350–900 CE) Saladoid at Frances that appears be similar Rican in processing...