Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Shaun L.L. Barker"'
Publikováno v:
Economic Geology. 116:803-819
Mineral distributions can be determined in drill core samples from a Carlin-type gold deposit, using micro-X-ray fluorescence (µXRF) raster data. Micro-XRF data were collected using a Bruker Tornado µXRF scanner on split drill core samples (~25 ×
Autor:
Rocky D. Barker, Shaun L.L. Barker, Matthew J. Cracknell, Elizabeth D. Stock, Geoffrey Holmes
Publikováno v:
Economic Geology. 116:821-836
Long-wave infrared (LWIR) spectra can be interpreted using a Random Forest machine learning approach to predict mineral species and abundances. In this study, hydrothermally altered carbonate rock core samples from the Fourmile Carlin-type Au discove
Autor:
Jasmine M. Robinson, Shaun L.L. Barker, Samuel R. McNally, Vickery L. Arcus, Louis A. Schipper
Publikováno v:
Biogeochemistry. 150:45-59
Accurate description of temperature response and sensitivity of different carbon pools within soil is critical for accurately modelling soil carbon stocks and changes. Inconsistent sampling, incubation and fractionation methods highlights the need fo
Autor:
Shaun L.L. Barker, Kathleen A. Campbell, Ayrton R. Hamilton, Diego Martin Guido, Julie V. Rowland
Publikováno v:
Journal of Volcanology and Geothermal Research. 381:209-226
The Late Miocene Whitianga Volcanic Centre of the Coromandel Volcanic Zone, North Island, New Zealand, is host to 18 known, siliceous and intensely silicified deposits including: silicified volcanics; sediments of inferred lacustrine, fluvial and mud
Publikováno v:
New Zealand Journal of Geology and Geophysics. 63:210-226
Maungatautari is an extinct, andesitic-dacitic composite cone situated 35 km southwest of Hamilton, New Zealand. This study examines the volcanic history and petrologic evolution of Maungatautari using field mapping, petrography of pyroclastic succes
Publikováno v:
New Zealand Journal of Geology and Geophysics. 62:513-530
Whole rock lithogeochemical data from the andesite rocks which host low-sulfidation epithermal gold veins in the Waihi district, New Zealand have been used to interpret hydrothermal alteration processes that variably altered the andesite rocks. The a
Publikováno v:
Geothermics. 80:31-43
The physiochemical evolution of active geothermal systems is important for assessing their long-term viability. Although discharge fluid chemistry provides information on geothermal well conditions, it only typically reflects the current state of the
Autor:
Shaun L.L. Barker, John C. Lassiter, Sarah C. Penniston-Dorland, Jaime D. Barnes, Andreas Klügel, Samuele Agostini, Jeffrey T. Cullen, Laura M. Wallace
Publikováno v:
Geosphere. 15:642-658
In order to trace the cycling of fluid-mobile elements (FMEs) through subduction zone forearcs, we collected water samples from two warm and 16 cold springs along the subaerially exposed forearc of the Hikurangi subduction zone in New Zealand. Water
Autor:
Shaun L.L. Barker, Gregory M. Dipple
Publikováno v:
Ore Deposits
Carbonate‐hosted ore deposits often have very limited mineralogical and lithogeochemical alteration halos, as the highly reactive carbonate host rocks neutralize acidic hydrothermal fluids, limiting the ability of those fluids to cause hydrothermal
Publikováno v:
Economic Geology. 114:375-396
Carbonate-hosted hydrothermal deposits typically show narrow visible mineralogical and textural alteration halos, which inhibit exploration targeting. In contrast, hydrothermal modification of the country rock’s stable isotope composition usually e