Results 191 to 200 of about 910 (212)
Some of the next articles are maybe not open access.
High‐precision relative thermobarometry: theory and a worked example
Journal of Metamorphic Geology, 2000A number of sources of uncertainty are involved in thermobarometric calculations, the most important of which are associated with analytical precision, activity–composition (a–x) relationships, and thermodynamic data. Statistical treatment of these uncertainties results in relatively large uncertainties on the calculated values of pressure and ...
null Worley, null Powell
openaire +1 more source
Clinopyroxene in postshield Haleakala ankaramite: 1. Efficacy of thermobarometry
Contributions to Mineralogy and Petrology, 2015Magma storage depth is a fundamental aspect of a volcano’s magmatic plumbing system that may be resolved using mineral-melt thermobarometry, assuming crystal growth occurs at near-equilibrium conditions. We acquire major and minor element compositional analyses of whole rock, groundmass separates, and clinopyroxene in ankaramite erupted ca.
Julia Hammer +4 more
openaire +1 more source
GEOTHERMS OF CONTINENTAL LITHOSPHERE BASED ON XENOLITH THERMOBAROMETRY
International Geology Review, 1993The thermobarometry of garnet lherzolite and pyroxenite xeno-liths from kimberlitic explosion pipes and volcanoes has been used to determine the geotherms, values of the surface heat flow, and the thickness of the lithosphere in regions of Archean orogeny (the Kaapvaal Craton, South Africa and Lesotho, and the Siberian Platform in the vicinity of the ...
openaire +1 more source
The Granulite Uncertainty Principle: Limitations on Thermobarometry in Granulites
The Journal of Geology, 1989There are three geothermometers based on reversed experimental data and applicable to granulites: the two-pyroxene, two-oxide, and garnet-clinopyroxene thermometers. All have apparent closure temperatures below those of the granulite facies. This casts significant doubt on the concept that "peak" temperatures are routinely obtained from ion-exchange ...
B. Ronald Frost, Thomas Chacko
openaire +1 more source
The current status of thermobarometry in metamorphic rocks
Geological Society, London, Special Publications, 1989SummaryInformation on pressure (P) and temperature (T) is a fundamental aspect of research on metamorphic terrains. Unfortunately, many workers employ thermobarometers that are not experimentally calibrated, are insensitive or too sensitive toP-Tchanges, depend on a priori assumptions of water pressure (such as most petrogenetic grids), or are rapidly ...
openaire +1 more source
Thermobarometry of the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway
Mineralium Deposita, 1998The Bleikvassli massive sulfide ore deposit is hosted by Proterozoic pelitic, quartzofeldspathic, and amphibolitic rocks of the Uppermost Allochthon of the Scandinavian Caledonides. Staurolite-garnet-biotite and kyanite-staurolite-biotite assemblages indicate that metamorphism reached the kyanite zone of the amphibolite facies.
J. L. Rosenberg +4 more
openaire +1 more source
Relative thermobarometry and metamorphic P-T, paths
Geological Society, London, Special Publications, 1989Summary Relative thermobarometry involves the determination of changes in P and T experienced by a rock through analysis of mineral zoning, inclusion suites and reaction textures. For this purpose, the differential forms of the thermodynamic equations and mass balance constraints ...
openaire +1 more source
EosFit-Pinc: A simple GUI for host-inclusion elastic thermobarometry
American Mineralogist, 2017Elastic geothermobarometry is a method of determining metamorphic conditions from the excess pressures exhibited by mineral inclusions trapped inside host minerals. An exact solution to the problem of combining non-linear Equations of State (EoS) with the elastic relaxation problem for elastically isotropic spherical host-inclusion systems without any ...
ANGEL, ROSS JOHN +3 more
openaire +3 more sources
Zircons: Age, Thermobarometry, and Source Inheritance
2021Dustin Trail +2 more
openaire +1 more source
Magma transport at Hawaii: Inferences based on igneous thermobarometry
Geology, 1997Pyroxene + liquid equilibrium in Hawaiian lavas occurs at a range of pressures for each volcano. Ranges are systematic and may be related to the stage of development of the magma conduit system. Kilauea, which is in its shield-building phase, yields relatively shallow storage estimates.
openaire +1 more source