Results 161 to 170 of about 2,038 (207)

Machine Learning Thermobarometry for Biotite-Bearing Magmas

Journal of Geophysical Research: Solid Earth, 2022
AbstractBiotite (sensu lato) is a widespread rock‐forming mineral in magmatic rocks that can be stable in a broad range of pressure and temperature, but appropriate biotite thermometers or barometers are lacking. Based on a collected experimental dataset (n = 839, T = 625–1,325°C, P = 1–48 kbar) containing biotites that span a wide compositional range [
Chao Zhang, Xiaoyan Li
exaly   +3 more sources

Reconstruction of the Talkeetna intraoceanic arc of Alaska through thermobarometry [PDF]

Journal of Geophysical Research: Solid Earth, 2008
The Talkeetna arc is one of two intraoceanic arcs where much of the section from the upper mantle through the volcanic carapace is well exposed. We reconstruct the vertical section of the Talkeetna arc by determining the (re)crystallization pressures at various structural levels. The thermobarometry shows that the tonalites and quartz diorites intruded
Peter Luffi, Mark D. Behn, Bradley R. Hacker   +2 more
exaly   +5 more sources

Elastic thermobarometry of ultrahigh-pressure metapelites from the Brossasco-Isasca Unit (Dora-Maira Massif, Western Alps)

Lithos, 2023
We applied zircon-in-garnet (ZiG) and chemical thermobarometry to garnet-bearing metapelites from the ultrahigh-pressure (UHP) Brossasco-Isasca Unit in the Dora-Maira Massif (Western Alps, Italy).
Christian Chopin, Matteo Alvaro, Mattia Gilio   +2 more
exaly   +2 more sources

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A Windows program for pyroxene-liquid thermobarometry

Periodico di Mineralogia, 2018
A Windows program (WinPLtb) has been developed to calculate wet–chemical and microprobe  pyroxene analyses based on the standard International Mineralogical Association (IMA-88) nomenclature scheme. The program allows the user to enter clinopyroxene, orthopyroxene and associated composition of liquid or whole-rock and some calculated components  in the
Yavuz, Fuat, Yıldırım, Demet Kıran
openaire   +1 more source

Thermobarometry in granulites: pitfalls and new approaches

Precambrian Research, 1992
Abstract Computer models of cooling granulite-facies rocks with the assemblage garnet+biotite+sillimanite+K-feldspar±plagioclase+quartz are presented that incorporate simultaneous reaction (net transfer and exchange) and multicomponent diffusion in garnet.
Frank S. Spear, Frank P. Florence
openaire   +1 more source

Mineral chemistry and thermobarometry of Eocene monzogabbroic stocks from the Bafra (Samsun) area in Turkey: implications for disequilibrium crystallization and emplacement conditions

International Geology Review, 2014
Monzogabbro stocks including felsic enclaves (monzosyenite) around the Bafra (Samsun) area at the western edge of the Eastern Pontides cut Eocene-aged volcanic and sedimentary units.
Emel Abdioglu Yazar, Cem Yücel, Irfan Temizel   +2 more
exaly   +2 more sources

Thermodynamic Modeling and Thermobarometry of Metasomatized Rocks

2012
Determining the P-T conditions at which metasomatism occurs provides insight into the physical conditions at which fluid-rock interaction occurs in the crust. However, application of thermodynamic modeling to metasomatized rocks is not without pitfalls.
Goncalves, Philippe, Marquer, Didier, Oliot, Emilien, Durand, Cyril   +3 more
openaire   +3 more sources

Single-pyroxene thermobarometry

Tectonophysics, 1980
Abstract Enstatites in peridotites from the Vourinos ophiolites, Greece, have exceptionally high Cr/Al ratios, though the pyroxenes are in equilibrium with picotite. Phase-chemistry data yield new empirical relations for the critical effect of Cr on Al solubility, in full agreement with local Cr/Al ratio variations observed in some massifs. These new
openaire   +1 more source

The Granulite Uncertainty Principle: Limitations on Thermobarometry in Granulites

The Journal of Geology, 1989
There 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
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Status of thermobarometry in granitic batholiths

Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 1996
ABSTRACT:Most granitic batholiths contain plutons which are composed of low-variance mineral assemblages amenable to quantification of the P– conditions that characterise emplacement. Some mineral thermometers, such as those based on two feldspars or two Fe–Ti oxides, commonly undergo subsolidus re-equilibration.
openaire   +1 more source