45 Result(s)
within
T. L. **
Earth Sciences
Mineralogy
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Article
XV. Die mandelsteinartigen Kersantitgänge
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Article
Deformation measurements on Kilauea volcano, Hawaii
Repeated electronic distance measurements across Kilauea Caldera with Tellurometers and Geodimeter show definite horizontal expansion related to the vertical uplift and outward tilting of the summit prior to a...
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Article
Crystallization of tholeiitic basalt in Alae Lava Lake, Hawaii
The eruption of Kilauea Volcano August 21–23, 1963, left 600,000 cubic meters of basaltic lava in a lava lake as much as 15 meters deep in Alae pit crater. Field studies of the lake began August 27 and include...
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Article
Deformation measurements on Mauna Loa Volcano, Hawaii
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Chapter
Exsolution in Metamorphic Bytownite
It is not possible to investigate the exsolution in calcic plagioclases using synthetic materials and standard phase equilibria experiments. The kinetics of the exchange NaSi⇌CaAl involved in the unmixing are ...
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Article
Petrology of Hualalai volcano, Hawaii: Implication for mantle composition
Hualalai is one of five volcanoes whose eruptions built the island of Hawaii. The historic 1800–1801 flows and the analyzed prehistoric flows exposed at the surface are alkalic basalts except for a trachyte co...
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Article
Use of FePt alloys to eliminate the iron loss problem in 1 atmosphere gas mixing experiments: Theoretical and practical considerations
Theoretical and practical considerations are combined to place limits on the iron content of an FePt alloy that is in equilibrium with silicate melt, olivine and a gas phase of known
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Article
Origin of calc-alkaline series lavas at Medicine Lake volcano by fractionation, assimilation and mixing: Corrections and clarifications
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Article
Fractionation of pyroxene-phyric MORB at low pressure: An experimental study
One-atmosphere melting experiments are used to assess the role of clinopyroxene in producing the compositional variations observed in mid-ocean-ridge basalts (MORBs) from the North Atlantic. Analog models of n...
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Article
Geological features and origin of the chromite deposits of sukinda valley, Orissa, India
The chromiferous ultramafic rocks of Sukinda Valley (21°0'–21°5'N:85°43'–86°0'E) of Orissa are intrusive into the Iron-Ore Supergroup (2,950–3,200 Ma) at the eastern periphery of the Indian Precambrian shield....
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Article
The evolution of young silicic lavas at Medicine Lake Volcano, California: Implications for the origin of compositional gaps in calc-alkaline series lavas
At Medicine Lake Volcano, California, the compositional gap between andesite (57–62 wt.% SiO2) and rhyolite (73–74 wt.% SiO2) has been generated by fractional crystallization. Assimilation of silicic crust has al...
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Article
Experimental petrology of normal MORB near the Kane Fracture Zone: 22°–25° N, mid-Atlantic ridge
Melting experiments carried out at 1-atm and at 2 kbar on mid-ocean ridge basalts dredged from the mid-Atlantic ridge near the Kane Fracture Zone (KFZ, 22° to 25° N. latitude) provide a basis for evaluating th...
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Chapter and Conference Paper
DOSECC’s Deep Scientific Drilling Project at Cajon Pass, California
The San Andreas fault in California presented an ideal target for the first deep scientific drilling project in the U.S. under DOSECC management. The San Andreas, one of only a handful of transform faults worl...
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Chapter and Conference Paper
A Pilot Vertical Seismic Profiling Experiment in the Cajon Pass Deep Scientific Drillhole
The Cajon Pass Deep Scientific Drillhole (see Henyey et al., this volume) is expected to provide one of the first opportunities for a comprehensive study of the crystalline crust using the vertical seismic pro...
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Article
Assimilation of granite by basaltic magma at Burnt Lava flow, Medicine Lake volcano, northern California: Decoupling of heat and mass transfer
At Medicine Lake volcano, California, andesite of the Holocene Burnt Lava flow has been produced by fractional crystallization of parental high alumina basalt (HAB) accompanied by assimilation of granitic crus...
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Article
Experimental investigations of low-Ca pyroxene stability and olivine-pyroxene-liquid equilibria at 1-atm in natural basaltic and andesitic liquids
This paper reports experiments carried out at 1-atm under conditions of controlled oxygen fugacity, using natural andesites and andesite mixed with augite+synthetic pigeonite or augite+orthopyroxene. The exper...
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Article
Experimental and major element constraints on the evolution of lavas from Lihir Island, Papua New Guinea
The major element chemistry of SiO2-undersaturated arc lavas from Lihir Island, Papua New Guinea, and 1 atmosphere experiments on an alkali basalt from this island show complex polybaric fractionation affected th...
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Article
Mineralogy of PGE in the mafic-ultramafic massifs of the Kola region
During the last few years nearly 50 minerals and unnamed platinum-group element (PGE) phases have been identified by the authors in nickel-bearing mafic-ultramafic massifs of the Kola region. About 20 establis...
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Article
Experimental investigations of the role of H2O in calc-alkaline differentiation and subduction zone magmatism
Phase relations of natural aphyric high-alumina basalts and their intrusive equivalents were determined through rock-melting experiments at 2 kb, H2O-saturated with fO2 buffered at NNO. Experimental liquids are l...
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Article
Temperatures and H2O contents of low-MgO high-alumina basalts
Experimental evidence is used to estimate H2O contents in low-MgO high-alumina basalts (HABs) (<6 wt.% MgO) and basaltic andesites (BAs) (<5 wt.% MgO) that occur worldwide in magmatic arcs. Wholerock compositions...
