Results 121 to 130 of about 3,336,558 (167)

The Archean Craton of Southern India: Metamorphic evolution and P-T conditions

Geologische Rundschau, 1982
The Archaean craton of southern India is characterized by a highly complicated and not yet fully understood geological history comprizing several cycles of sedimentation and volcanism, deformation and metamorphism in the span between about 3400 and 2500 m. y.
Ackermand, D., Raase, P., Raith, M., Lal, R. K.   +3 more
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Transformation of Arthropod Biopolymers in High P-T Conditions

2013
Modern arthropod cuticles consist of chitin fibres in a protein matrix, but fossil arthropods, particularly those earlier than Tertiary, yield an aliphatic composition. This apparent contradiction is addressed in this chapter. Modern cockroach, scorpion and shrimp cuticle were subjected to artificial heating (maturation) techniques (350 °C/700 Bars/24 ...
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Metamorphic ultrahigh-pressure tourmaline: Structure, chemistry, and correlations to P-T conditions

American Mineralogist, 2009
Tourmaline grains extracted from rocks within three ultrahigh-pressure (UHP) metamorphic localities have been subjected to a structurally and chemically detailed analysis to test for any systematic behavior related to temperature and pressure. Dravite from Parigi, Dora Maira, Western Alps (peak P-T conditions ~3.7 GPa, 750 °C), has a structural formula
Ertl, A, Marschall, HR, Giester, G, Henry, DJ, Schertl, H-P, Ntaflos, T, Luvizotto, GL, Nasdala, L, Tillmanns, E   +8 more
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P-T-a(H2O) Conditions in the Thermal Aureole

1991
In this chapter estimates are made of the pressure of emplacement of the Ballachulish Igneous Complex and the range of maximum temperatures in the surrounding thermal aureole. Using these P-T estimates, quantitative estimates of a(H2O) are made for pelites at different grades in the aureole.
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P-T conditions in the Moines of the Central Highlands, Scotland

Journal of the Geological Society, 1979
P-T conditions of regional Caledonian metamorphism recorded by calc-silicate assemblages in Moine rocks from the Central Highlands vary from 550°C, 7 ± 2 kbar, near Loch Laggan, to 670°C, 10 ± 2 kbar in the central Spey valley. The pressure conditions correspond to 30–35 km of tectonic cover in the Central Highlands during the metamorphic temperature ...
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Molecular Transformation of Bacteria at High P-T Conditions

2013
Analysis of the solvent insoluble residue of a cyanobacterium (Oscillatoria sp.) subjected to simulated diagenesis under hydrothermal conditions (350 and 260 °C and hydrostatic pressure of 700 atmospheres) affords a macromolecule with significant aliphatic content that is similar to that found in hydrogen rich kerogen.
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P-T conditions of the Jandagh metapelitic schists, Northeastern Isfahan Province, Iran

Petrology, 2010
The metapelitic schists of Jandagh or simply Jandagh metapelites can be divided into four groups based on mineral assemblages: (1) quartz-muscovite schists, (2) quartz-muscovite-biotite schists, (3) garnet-muscovite-chlorite schists, and (4) garnet-muscovite-staurolite schists.
S. M. Tabatabaei Manesh, M. Sharifi, A. Romanko   +2 more
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Molecular Transformation of Plant Biopolymers in High P-T Conditions

2013
Experimental heating of plant tissues (350 °C, 700 bars) generated a resistant non-hydrolysable aliphatic macromolecule similar to that comprising organic matter in ancient sediments and fossil leaves. Comparison of the products derived from such heating of different pre-treated plant tissues clearly demonstrates that solvent-extractable and ...
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Electrical conductivity measurement of gneiss under mid- to lower crustal P–T conditions

Tectonophysics, 2007
Abstract We conducted electrical conductivity measurements perpendicular and parallel to mineral foliation in dry gneiss at up to 1000 K and a constant pressure of 1 GPa. The analyzed gneisses were obtained from the Higo metamorphic belt, Kyushu, Japan.
Kiyoshi Fuji-ta, Tomoo Katsura, Takuya Matsuzaki, Masahiro Ichiki, Tomoyuki Kobayashi   +4 more
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Pargasite at extreme conditions: a comprehensive P-T study

2017
Pargasite is a Ca-amphibole associated to medium- or high-pressure/high-temperature conditions. The occurrence of hydroxyl groups into the amphibole’s structure has proved to be a significant agent in the water cycle within the upper mantle (e.g., Gill 1981). In order to better understand the water cycle in the upper and potentially lower mantle, it is
Comboni, Davide, Gatta, G. Diego, Lotti, Paolo, Merlini, Marco, Liermann, Hanns-Peter, Frost, Daniel J.   +5 more
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