Search Results - "APPEL, PETER W. U."

Hadean mantle melting recorded by southwest Greenland chromitite 186Os signatures by Coggon, Judith A., Luguet, Ambre, Nowell, Geoffrey M., Appel, Peter W. U.

“…Earth’s crust formed from melted mantle, yet the earliest record of this process is recorded only in crustal rocks. Isotopic dating of mantle rocks in the…”
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Introduction of Mercury-free Gold Extraction Methods to Medium-Scale Miners and Education of Health Care Providers to Reduce the use of Mercury in Sorata, Bolivia by Appel, Peter W U, Andersen, Astrid, Na-Oy, Leoncio D, Onos, Rudy

“…Artisanal and small-scale miners in Bolivia release on the order of 120 tons of mercury annually. The mercury finds its way to the Amazon with catastrophic…”
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New age (ca. 2970 Ma), mantle source composition and geodynamic constraints on the Archean Fiskenæsset anorthosite complex, SW Greenland by Polat, Ali, Frei, Robert, Scherstén, Anders, Appel, Peter W.U.

“…The Archean Fiskenæsset Complex, SW Greenland, consists of an association of ca. 550-meter-thick layered anorthosite, leucogabbro, gabbro, and ultramafic rocks…”
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Metamorphic fluid flow in the northeastern part of the 3.8–3.7 Ga Isua Greenstone Belt (SW Greenland): A re-evalution of fluid inclusion evidence for early Archean seafloor-hydrothermal systems by Heijlen, Wouter, Appel, Peter W.U., Frezzotti, Maria-Luce, Horsewell, Andy, Touret, Jacques L.R.

“…Fluid inclusions in quartz globules and quartz veins of a 3.8–3.7 Ga old, well-preserved pillow lava breccia in the northeastern Isua Greenstone Belt (IGB)…”
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Comparison of Gold Yield with Traditional Amalgamation and Direct Smelting in Artisanal Small-Scale Gold Mining in Uganda by Stoffersen, Birgitte, Køster-Rasmussen, Rasmus, Cardeño, Jorge Ivan Contreras, Appel, Peter W U, Smidth, Margrethe, Na-Oy, Leoncio D, Lardizabal, Debbie Libua, Onos, Rudy W

“…The amalgamation method used by artisanal small-scale miners is the single largest source of global mercury emission. The goal of the 'Free Your Mine' project…”
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A matter of approach: the retort's potential to reduce mercury consumption within small-scale gold mining settlements in Tanzania by Jønsson, Jesper Bosse, Appel, Peter W.U., Chibunda, Raphael Tihelwa

“…The mercury-based gold extraction processes prevalent within small-scale mining are both efficient and harmful. While ensuring relatively high levels of gold…”
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Mercury and gold concentrations of highly polluted environmental samples determined using prompt gamma-ray analysis and instrument neutron activation analysis by Osawa, Takahito, Hatsukawa, Yuichi, Appel, Peter W.U., Matsue, Hideaki

“…The authors have established a method of determining mercury and gold in severely polluted environmental samples using prompt gamma-ray analysis (PGA) and…”
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Introduction of Mercury-Free Gold Extraction to Small-Scale Miners in the Cabo Delgado Province in Mozambique by Stoffersen, Birgitte, Appel, Peter Wu, Na-Oy, Leoncio D, Sekamane, Asta Selloane, Ruiz, Ivan Zahinos, Køster-Rasmussen, Rasmus

“…The majority of small-scale gold miners worldwide, including those in Mozambique, use mercury to extract gold. Over the last fifty years, gold production from…”
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A review of structural patterns and melting processes in the Archean craton of West Greenland: Evidence for crustal growth at convergent plate margins as opposed to non-uniformitarian models by Polat, Ali, Wang, Lu, Appel, Peter W.U.

“…The Archean craton of West Greenland consists of many fault-bounded Eoarchean to Neoarchean tectonic terranes (crustal blocks). These tectonic terranes are…”
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An overview of the geochemistry of Eoarchean to Mesoarchean ultramafic to mafic volcanic rocks, SW Greenland: Implications for mantle depletion and petrogenetic processes at subduction zones in the early Earth by Polat, Ali, Appel, Peter W.U., Fryer, Brian J.

“…This study reviews the geochemical characteristics of Eoarchean to Mesoarchean ultramafic to mafic volcanic rocks (now amphibolites) in SW Greenland and…”
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Geochemistry of ultramafic rocks and hornblendite veins in the Fiskenæsset layered anorthosite complex, SW Greenland: Evidence for hydrous upper mantle in the Archean by Polat, Ali, Fryer, Brian J., Samson, Iain M., Weisener, Chris, Appel, Peter W.U., Frei, Robert, Windley, Brian F.

“…[Display omitted] ► Ultramafic rocks in the Archean Fiskenæsset Complex, SW Greenland, contain abundant igneous amphibole. ► Ultramafic rocks are intruded by…”
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Trace element systematics of the Neoarchean Fiskenæsset anorthosite complex and associated meta-volcanic rocks, SW Greenland: Evidence for a magmatic arc origin by Polat, Ali, Appel, Peter W.U., Fryer, Brian, Windley, Brian, Frei, Robert, Samson, Iain M., Huang, Hua

“…New major and high-precision ICP-MS trace element data on the Neoarchean (ca. 2970 Ma) layered Fiskenæsset Complex and associated volcanic rocks, southern West…”
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Geochemistry of anorthositic differentiated sills in the Archean (~ 2970 Ma) Fiskenæsset Complex, SW Greenland: Implications for parental magma compositions, geodynamic setting, and secular heat flow in arcs by Polat, Ali, Fryer, Brian J., Appel, Peter W.U., Kalvig, Per, Kerrich, Robert, Dilek, Yildirim, Yang, Zhaoping

“…The Fiskenæsset Complex, SW Greenland, is one of the best preserved layered Archean intrusions in the world, consisting of an association of ca…”
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Understanding Re–Os systematics and model ages in metamorphosed Archean ultramafic rocks: A single mineral to whole-rock investigation by Coggon, Judith A., Luguet, Ambre, Fonseca, Raúl O.C., Lorand, Jean-Pierre, Heuser, Alexander, Appel, Peter W.U.

“…187Rhenium–187Os model ages are used to infer the timing of crust-mantle differentiation events and evolution of lithospheric mantle. However, ancient samples…”
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Age constraints on Late Paleozoic evolution of continental crust from electron microprobe dating of monazite in the Peloritani Mountains (southern Italy): another example of resetting of monazite ages in high-grade rocks by Appel, Peter, Cirrincione, Rosolino, Fiannacca, Patrizia, Pezzino, Antonino

“…In situ monazite microprobe dating has been performed, for the first time, on trondhjemite and amphibolite facies metasediments from the Peloritani Mountains…”
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Geochemistry of the Mesoarchean Fiskenæsset Complex at Majorqap qâva, SW Greenland: Evidence for two different magma compositions by Huang, Hua, Polat, Ali, Fryer, Brian J., Appel, Peter W.U., Windley, Brian F.

“…The Mesoarchean Fiskenæsset Complex was emplaced as multiple sills and dykes of magma and crystal mush into oceanic crust, forming an association of ca…”
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The origin of geochemical trends and Eoarchean (ca. 3700 Ma) zircons in Mesoarchean (ca. 3075 Ma) ocelli-hosting pillow basalts, Ivisaartoq greenstone belt, SW Greenland: Evidence for crustal contamination versus crustal recycling by Polat, Ali, Frei, Robert, Fryer, Brian, Appel, Peter W.U.

“…The Mesoarchean Ivisaartoq greenstone belt consists of tholeiitic pillow basalts, picrites, boninites, gabbroic to dioritic dykes and sills, actinolite schists…”
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Field and geochemical characteristics of the Mesoarchean (∼ 3075 Ma) Ivisaartoq greenstone belt, southern West Greenland: Evidence for seafloor hydrothermal alteration in supra-subduction oceanic crust by Polat, Ali, Appel, Peter W.U., Frei, Robert, Pan, Yuanming, Dilek, Yıldırım, Ordóñez-Calderón, Juan C., Fryer, Brian, Hollis, Julie A., Raith, Johann G.

“…The Mesoarchean (ca. 3075 Ma) Ivisaartoq greenstone belt in southern West Greenland includes variably deformed and metamorphosed pillow basalts, ultramafic…”
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Dacitic ocelli in mafic lavas, 3.8–3.7 Ga Isua greenstone belt, West Greenland: Geochemical evidence for partial melting of oceanic crust and magma mixing by Appel, Peter W.U., Polat, Ali, Frei, Robert

“…Mafic volcanic rocks in the 3.8–3.7 Ga Isua greenstone belt, southern West Greenland, contain randomly distributed 1 to 10-centimeters long white spheroidal…”
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Contrasting geochemical patterns in the 3.7–3.8 Ga pillow basalt cores and rims, Isua greenstone belt, Southwest Greenland: implications for postmagmatic alteration processes by Polat, Ali, Hofmann, Albrecht W., Münker, Carsten, Regelous, Marcel, Appel, Peter W.U.

“…Pillow basalts from the early Archean (3.7 to 3.8 Ga) Isua greenstone belt, West Greenland, are characterized by well-preserved rims and concentric core…”
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