Importance of equilibration time in the partitioning and toxicity of zinc in spiked sediment bioassays

The influences of spiked Zn concentrations (1-40 micromol/g) and equilibration time (approximately 95 d) on the partitioning of Zn between pore water (PW) and sediment were evaluated with estuarine sediments containing two levels (5 and 15 micromol/g) of acid volatile sulfides (AVS). Their influence on Zn bioavailability was also evaluated by a parallel, 10-d amphipod (Leptocheirus plumulosus) mortality test at 5, 20, and 85 d of equilibration. During the equilibration, AVS increased (up to twofold) with spiked Zn concentration ([Zn]), whereas Zn-simultaneously extracted metals ([SEM]; Zn with AVS) remained relatively constant. Concentrations of Zn in PW decreased most rapidly during the initial 30 d and by 11-...

Categories: Publication; Types: Citation; Tags: Amphipoda, Animals, Biological Assay, Biological Availability, Geologic Sediments, All tags... Kinetics, Lethal Dose 50, Reproducibility of Results, Sulfides, Volatilization, Zinc, adsorption, water, Fewer tags

Analyses of historic U.S. Bureau of Mines rock and heavy mineral concentrate samples for geochemical trace-element and rare-earth element data--Ray Mountains and Kanuti-Hodzana uplands area, Alaska

Re-analyses of sample pulps and bulk rejects from historic USBM rock and heavy-mineral-concentrate samples were conducted by the Alaska Division of Geological & Geophysical Surveys (DGGS) as part of the State of Alaska's Strategic and Critical Minerals Assessment project, which is designed to evaluate Alaska's potential for these resources. The objective of this resource assessment is to expand the state's geochemical database by obtaining and publishing modern, quantitative geochemical analyses for historic USBM samples, where available. Highlights of this re-analysis project include heavy mineral concentrates with up 7,220 ppm Sn, 5,870 ppm Cr, and 17,000 ppm Mn.

Tags: Aluminum, Antimony, Arsenic, Barium, Basalt, All tags... Base Metals, Beaver Quadrangle, Bedrock, Beryllium, Bettles Quadrangle, Bismuth, Bonanza Creek, Cadmium, Calcium, Caribou Mountain, Cerium, Cesium, Chlorite, Chromium, Coal Creek, Cobalt, Copper, Critical Minerals, Dall River, Dalton Highway, Dysprosium, Economic Geology, Erbium, Europium, Exploration, Felsic, Fish Creek, Fluorine, Fort Hamlin Hills, Gadolinium, Galena, Gallium, Geochemical Data, Geochemical Surveys, Geochemistry, Germanium, Gobblers Knob, Gold, Granite, Greisen, Hafnium, Heavy Metals, Holmium, Igneous Rocks, Iron, Ishtalitna Creek, Kanuti Hot Springs, Kanuti Kilolitna River, Kanuti River, Kilo Hot Springs, Koyukuk Mining District, Lanthanide Elements, Lanthanum, Livengood Quadrangle, Lode, Lower Ray Hot Springs, Lutetium, Magnesium, Manganese, McQuesten Creek, Metabasite, Metals, Metamorphic Rocks, Metasedimentary rocks, Metavolcanic rocks, Mineral Assessment, Mineral Deposit, Mineral Resources, Molybdenum, Monazite, Mount Henry Eakin, Mount Tozi, Neodymium, Nickel, Niobium, No Name Creek, Non-Metals, Palladium, Pan Concentrates, Phosphorus, Placer, Placer Gold, Platinum, Platinum Group Elements, Potassium, Praseodymium, Precious Metals, Promethium, Prospect Creek, Rare Earth Elements, Ray Mountains, Ray River, Ray River Hot Springs, Ree, Resource Assessment, Resources, Rubidium, Samarium, Scheelite, Schist, Selenium, Silica, Silver, Sithylemenkat Lake, Sodium, Sphalerite, Strategic Minerals, Stream Sediments, Strontium, Sulfides, Sulfur, Tanana Quadrangle, Tantalum, Thallium, Thorium, Tin, Titanium, Tokusatatquaten Lake, Torment Creek, Tourmaline, Trace Elements, Trace Geochemical, Trace Metals, Trans-Alaska Pipeline, Tungsten, Upper Ray Hot Springs, Uranium, Vanadium, Ytterbium, Zeunerite, Zinc, Zirconium, geoscientificInformation, Fewer tags

Mofete and San Vito geothermal field ore mineralization data

The Mofete and San Vito geothermal fields, located west of Naples, Italy, are part of the Campi Flegrei volcanic complex. A joint venture in the 1970s between AGIP and ENEL, the Italian National electric and petroleum utilities, respectively, drilled exploratory wells to a depth of ~3000 m in an attempt to locate high-enthalpy fluids for potential power production. Drill core samples from Mofete wells (MF1, MF2, and MF5) and from San Vito wells (SV1 and SV3) contain authigenic ore mineralization. Pyrite, pyrrhotite, and galena are abundant. Less common are chalcopyrite, sphalerite, arsenopyrite, scheelite, and rare are millerite, violarite, native bismuth, tellurobismuthite, cassiterite, molybdenite, and acanthite....

Categories: Data; Tags: Energy Resources, Italy, Ore deposits, USGS Science Data Catalog (SDC), geothermal fields, All tags... pyrite, pyrrhotite, sulfides, Fewer tags

Major-oxide, minor-oxide, and trace-element geochemical data from rocks in the Styx River area, Lime Hills C-1 Quadrangle, Lime Hills, McGrath, Talkeetna, and Tyonek quadrangles, Alaska

Geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) Mineral Resources Section conducted four weeks of helicopter-supported mapping and fieldwork from June 26 through July 24, 2013. The Styx River project in the Lime Hills C-1 Quadrangle was part of the State-funded Airborne Geophysical/Geological Mineral Inventory (AGGMI) program as part of the State's Strategic Minerals Assessment Project, an initiative designed to evaluate Alaska's potential for rare-earth elements, PGEs, and other similarly supply-challenged resources. The Styx River project area has active and ongoing mineral exploration for deposit types including porphyry copper/molybdenum/gold, reduced intrusion-related gold, and...

Tags: Alaska Range, Aluminum, Antimony, Arsenic, Barium, All tags... Basalt, Base Metals, Bedrock, Beryllium, Bismuth, Cadmium, Calcium, Cerium, Cesium, Chalcopyrite, Chlorite, Chromium, Cobalt, Copper, Critical Minerals, Dysprosium, Economic Geology, Erbium, Europium, Exploration, Felsic, Fluorine, Gadolinium, Galena, Gallium, Geochemical Data, Geochemical Surveys, Geochemistry, Geology, Germanium, Gold, Granite, Greisen, Hafnium, Heavy Metals, Holmium, Hornfels, Igneous Rocks, Iron, Lime Hills Quadrangle, Lode, Lutetium, Magnesium, Major Oxides, Manganese, McGrath Quadrangle, Metals, Mineral Assessment, Mineral Deposit, Mineral Localities, Mineral Resources, Minor Oxides, Molybdenum, Neodymium, Nickel, Niobium, Non-Metals, Palladium, Phosphorus, Platinum, Platinum Group Elements, Plutons, Potassium, Precious Metals, Promethium, Rubidium, Selenium, Silica, Silver, Sodium, Sphalerite, Strategic Minerals, Strategic and Critical Minerals Assessment Project, Strontium, Sulfides, Sulfur, Talkeetna Quadrangle, Tantalum, Thallium, Thorium, Tin, Titanium, Tourmaline, Trace Elements, Trace Metals, Tungsten, Tyonek Quadrangle, Uranium, Vanadium, Volcanic, Zinc, Zirconium, geoscientificInformation, Fewer tags

Geochemical major-oxide, minor-oxide, trace-element, and rare-earth-element data from rocks and streams sediments collected in 2012 in the Ray Mountains area, Beaver, Bettles, Livengood, and Tanana quadrangles, Alaska

Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a helicopter-supported geological and geochemical resource assessment project in the Beaver, Bettles, Livengood, and Tanana quadrangles from June 23 through August 5, 2012. The objectives of DGGS's resource assessment are to improve the trace-element geochemical coverage of selected watersheds; to obtain modern, quantitative geochemical analyses; to understand the petrogenesis of the granites; and to better document established mineral occurrences. Stream-sediment, pan-concentrate, and rock sampling were conducted as part of the State's Rare Earth Elements and Strategic Minerals Assessment project, which is...

Tags: Aluminum, Antimony, Arsenic, Augen Gneiss, Barium, All tags... Basalt, Base Metals, Batholith, Beaver Quadrangle, Bedrock, Beryllium, Bettles Quadrangle, Bismuth, Bonanza Creek, Cadmium, Calcium, Caribou Mountain, Cerium, Cesium, Chalcopyrite, Chlorite, Chromium, Coal Creek, Cobalt, Copper, Critical Minerals, Dall River, Dalton Highway, Dysprosium, Economic Geology, Erbium, Europium, Exploration, Felsic, Fish Creek, Fleshlanana Creek, Fluorine, Fort Hamlin Hills, Gadolinium, Galena, Gallium, Geochemical Data, Geochemical Surveys, Geochemistry, Geology, Germanium, Gishna Creek, Gneiss, Gobblers Knob, Gold, Granite, Greisen, Hafnium, Halu Creek, Heavy Metals, Holmium, Hornfels, Igneous Rocks, Iron, Ishtalitna Creek, Kanuti Hot Springs, Kanuti Kilolitna River, Kanuti River, Kilo Hot Springs, Koyuk Mining District, Lanthanide Elements, Lanthanum, Livengood Quadrangle, Lode, Lower Ray Hot Springs, Lutetium, Magnesium, Major Oxides, Manganese, McQuesten Creek, Metabasite, Metals, Metamorphic Rocks, Metasedimentary rocks, Metavolcanic rocks, Mineral Assessment, Mineral Deposit, Mineral Localities, Mineral Resources, Minor Oxides, Molybdenum, Monazite, Mount Henry Eakin, Mount Tozi, Neodymium, Nickel, Niobium, No Name Creek, Non-Metals, Palladium, Pan Concentrates, Phosphorus, Placer, Placer Gold, Platinum, Platinum Group Elements, Potassium, Praseodymium, Precious Metals, Promethium, Prospect Creek, Rare Earth Elements, Ray Mountains, Ray River, Ray River Hot Springs, Ree, Resource Assessment, Resources, Rhyolite, Rubidium, Samarium, Scheelite, Schist, Selenium, Silica, Silver, Sithylemenkat Lake, Sodium, Soil Chemistry, Soil Sampling, Sphalerite, Strategic Minerals, Stream Sediments, Strontium, Sulfides, Sulfur, Tanana Quadrangle, Tantalum, Thallium, Thorium, Tin, Titanium, Tokusatatquaten Lake, Torment Creek, Tourmaline, Trace Elements, Trace Geochemical, Trace Metals, Trans-Alaska Pipeline, Tungsten, Upper Ray Hot Springs, Uranium, Vanadium, Volcaniclastics, Ytterbium, Zeunerite, Zinc, Zirconium, geoscientificInformation, Fewer tags

Importance of equilibration time in the partitioning and toxicity of zinc in spiked sediment bioassays

The influences of spiked Zn concentrations (1-40 micromol/g) and equilibration time (approximately 95 d) on the partitioning of Zn between pore water (PW) and sediment were evaluated with estuarine sediments containing two levels (5 and 15 micromol/g) of acid volatile sulfides (AVS). Their influence on Zn bioavailability was also evaluated by a parallel, 10-d amphipod (Leptocheirus plumulosus) mortality test at 5, 20, and 85 d of equilibration. During the equilibration, AVS increased (up to twofold) with spiked Zn concentration ([Zn]), whereas Zn-simultaneously extracted metals ([SEM]; Zn with AVS) remained relatively constant. Concentrations of Zn in PW decreased most rapidly during the initial 30 d and by 11-...

Categories: Publication; Types: Citation; Tags: Amphipoda, Animals, Biological Assay, Biological Availability, Geologic Sediments, All tags... Kinetics, Lethal Dose 50, Reproducibility of Results, Sulfides, Volatilization, Zinc, adsorption, water, Fewer tags

Will fluctuations in salt marsh - mangrove dominance alter vulnerability of a subtropical wetland to sea-level rise?

To avoid submergence during sea-level rise, coastal wetlands build soil surfaces vertically through accumulation of inorganic sediment and organic matter. At climatic boundaries where mangroves are expanding and replacing salt marsh, wetland capacity to respond to sea-level rise may change. To compare how well mangroves and salt marshes accommodate sea-level rise, we conducted a manipulative field experiment in a subtropical plant community in the rapidly subsiding Mississippi River Delta. Experimental plots were established in spatially equivalent positions along creek banks in monospecific stands of Spartina alterniflora (smooth cordgrass) or Avicennia germinans (black mangrove) and in mixed stands containing...

Categories: Data; Types: Citation; Tags: Ecology, Geomorphology, Louisiana, Port Fourchon, USGS Science Data Catalog (SDC), All tags... accretion, bulk density, disturbance, elevation change, mangrove, mangrove, salinity, salt marshes, sea-level rise, subsidence, sulfides, water pH, Fewer tags