Results 221 to 230 of about 30,877 (270)

Hydrogen Production from Mafic/Ultramafic Rocks

SPE Annual Technical Conference and Exhibition
Abstract Hydrogen is a clean fuel which can be burnt without any carbon emissions. To minimize greenhouse gas emissions, humanity would need a significant amount of hydrogen as a fuel. The goal of this work is to understand the mechanisms of geological production of hydrogen in mafic and ultramafic rocks.
K. Panthi, C. V. Oeiyono, K. K. Mohanty
openaire   +1 more source

Metasomatic Alteration of Ultramafic Rocks

1989
Metasomatized ultramafic rocks from the 3800 Ma Isua supracrustal belt have been preferentially enriched in calcium, aluminium and silica, but show no or only little addition of potassium and rubidium. This unusual geochemical response to fluid infiltration can be explained in the light of a low buffered activity of aqueous silica during progressive ...
openaire   +1 more source

On the Origin of Ultramafic Rocks

Geological Society of America Bulletin, 1971
It is argued that most alpine ultramafic bodies originated as cumulates in basic magma chambers high in the crust. From some of these chambers, magmas were intruded upward or extruded, leaving sill-like ultramafites behind. These were subsequently folded or dismembered by faulting, and, because of their high density, subsided during tectonism, to form ...
openaire   +1 more source

Alpine ultramafic rocks of southwestern British Columbia

Canadian Journal of Earth Sciences, 1982
Ultramafic rocks of the Hozameen, Bridge River, and Cache Creek ophiolite assemblages show much variety. The Coquihalla belt of the Hozameen ophiolite assemblage, almost completely serpentinized, is elongate, narrow, and lies along a major fault. Three ultramafic bodies from the Bridge River ophiolite differ markedly from each other.
R. L. Wright, Joe Nagel, K. C. McTaggart
openaire   +1 more source

Ultramafic rocks in Angleseytheir non-tectonic emplacement

Journal of the Geological Society, 1975
The ophiolitic suite of Monian rocks in Anglesey has been regarded as segments of oceanic crust or upper mantle and sediments that were tectonically emplaced by cold shearing or thrusting during plate subduction. These processes are inconsistent with the field evidence.
openaire   +1 more source

Mineral Carbonation in Ultramafic and Basaltic Rocks

2016
Carbon capture and storage in the form of mineral carbonation in ultramafic and basaltic rocks offers a geologically stable repository of anthropogenic CO2. This chapter provides fundamental, theoretical and applied concepts relevant to mineral carbonation in peridotite, serpentinite and basaltic rocks.
Pablo García del Real, V. Vishal
openaire   +1 more source

The origin of ultramafic and ultrabasic rocks

Tectonophysics, 1969
Ultramafic rocks are classified in terms of their field associations and tectonic environment. Eleven associations are distinguished, some with subdivisions. The major features of each association are described in turn, and it is emphasized that the variety of field and petrographic associations indicates that a variety of processes is involved in the ...
openaire   +2 more sources

Chlorine and fluorine abundances in ultramafic rocks

Geochimica et Cosmochimica Acta, 1968
Abstract A total of 55 ultramafic rocks of various modes of occurrence has been analysed for chlorine and fluorine by a rapid spectrophotometric method. The different modes of occurrence seem to have different abundance levels of Cl and F, but this may be due to secondary effects.
A.M. Stueber, W.H. Huang, W.D. Johns
openaire   +1 more source

Peridotites and other ultramafic rocks

Geology Today
Peridotites are a group within the category of ultramafic rocks. These are usually dark‐coloured rocks rich in magnesium, poor in silica and lacking feldspars. Earth's mantle, which makes up 83 percent by volume and 67 percent by weight of the planet, consists largely of peridotite, which, although relatively sparse at the surface, therefore, is Earth ...
openaire   +1 more source

Ultramafic inclusions in basaltic rocks from Hawaii

Contributions to Mineralogy and Petrology, 1966
Ultramafic inclusions and the enclosing basaltic rocks were collected from a number of localities in the Hawaiian Islands; these and other specimens were studied by standard petrographic techniques and with an electron microprobe. Emphasis was on determination of mineral assemblages, mineral compositions, and variations in composition.
openaire   +1 more source