Results 31 to 40 of about 110,511 (334)

Spatio-Temporal Evolution of Intermediate-Depth Seismicity Beneath the Himalayas: Implications for Metamorphism and Tectonics

open access: yesFrontiers in Earth Science, 2021
Intermediate-depth earthquakes (>40 km) have been observed beneath the central Himalayas over decades, with little known about their nature and characteristics.
Konstantinos Michailos   +3 more
doaj   +1 more source

Late Precambrian U-Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland [PDF]

open access: yes, 2003
There has been controversy over the number and timing of orogenies in the Precambrian Moine block in the Scottish Caledonides since the earliest radiometric dating in the 1960s. This work challenges a recent hypothesis, that this sector of the Laurentian
Evans, J.A., Tanner, P.W.G.
core   +1 more source

ORE GEOLOGY PROBLEMS AND THE HUMAN FACTOR. PART 3. METAMORPHISM AND MESOTHERMAL OREFORMATION

open access: yesИзвестия Томского политехнического университета: Инжиниринг георесурсов, 2019
The relevance of the research. The conditions of the known large mesothermal gold deposits formation into black shales states of different age form the subject of animated discussion which often acquires the signs of substitute and probably therefore the
Igor V. Kucherenko
doaj   +1 more source

Late Cenozoic metamorphic evolution and exhumation of Taiwan [PDF]

open access: yes, 2007
The Taiwan mountain belt is composed of a Cenozoic slate belt (Hsuehshan Range units, HR, and Backbone Slates, BS) and of accreted polymetamorphic basement rocks (Tananao Complex, TC).
Avouac, Jean-Philippe   +6 more
core   +4 more sources

Experimental study and weighting analysis of factors influencing gas desorption

open access: yesFrontiers in Earth Science, 2023
Gas is one of the necessary contributing factors for coal and gas outburst accidents, and the gas desorbed in coal is the energy carrier in the outburst process.
Xin He   +6 more
doaj   +1 more source

The effect of aqueous alteration and metamorphism in the survival of presolar silicate grains in chondrites [PDF]

open access: yes, 2008
Relatively small amounts (typically between 2-200 parts per million) of presolar grains have been preserved in the matrices of chondritic meteorites.
Bischoff   +31 more
core   +2 more sources

The 1.79 Ga Särkilahti leucogranite – a horizontal magma layer below granulite-grade migmatites in SE Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 2019
The heterogeneous, peraluminous Särkilahti garnet-cordierite leucogranite occupies ~ 75 km2 area in Svecofennian granulite-grade terrain of SE Finland. Country rocks are metasedimentary garnet-cordierite-biotite migmatites with some orthopyroxenegarnet ...
Hannu Mäkitie   +3 more
doaj   +1 more source

Zircon ages in granulite facies rocks: decoupling from geochemistry above 850 °C? [PDF]

open access: yes, 2018
Granulite facies rocks frequently show a large spread in their zircon ages, the interpretation of which raises questions: Has the isotopic system been disturbed? By what process(es) and conditions did the alteration occur?
A Boriani   +120 more
core   +1 more source

Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizário ultramafic amphibolite, Encantadas Complex, southernmost Brazil

open access: yesAnais da Academia Brasileira de Ciências, 2003
The integrated investigation of metamorphism and zircon U-Pb SHRIMP geochronology of the Belizário ultramafic amphibolite from southernmost Brazil leads to a better understanding of the processes involved in the generation of the Encantadas Complex ...
Léo A. Hartmann   +4 more
doaj   +1 more source

Constraining the long-term evolution of the slip rate for a major extensional fault system in the central Aegean, Greece, using thermochronology [PDF]

open access: yes, 2006
The brittle/ductile transition is a major rheologic boundary in the crust yet little is known about how or if rates of tectonic processes are influenced by this boundary.
Altherr   +57 more
core   +1 more source

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