Results 11 to 20 of about 1,607 (230)

DERIVATIVES AND ANALYTIC SIGNALS: Improved Techniques for Lithostructural Classification. [PDF]

Malaysian Journal of Geosciences, 2018
In this study, derivatives and Analytic Signal (AS) techniques were employed to reveal the nature of rocks and lithostructural relationships that exist within the basement complexes around Ekiti and Ondo States.
Akingboye A. Sunny
doaj   +1 more source

PETROGRAPHIC STUDIES AND PHYSICO-MECHANICAL PROPERTIES OF BIRIMIAN GRANITOIDS – A CASE STUDY OF OYOKO GRANITOIDS COMPLEX IN KOFORIDUA [PDF]

Geological Behavior, 2022
The study investigated the physico-mechanical and petrographic properties of the basin-type granitoids of the Oyoko granitoid complex, to establish their strengths for engineering properties.
Matthew Coffie Wilson, Rosalia Appiah Mangue Amankwah, Samuel Kow Ansah, Selase Nani, Dennis Asante   +4 more
doaj   +1 more source

Study of mineral chemistry, thermobarometry and petrogenesis of migmatitic rocks of Hamedan area [PDF]

پترولوژی, 2018
In the Hamedan region, migmatitic rocks occur with various structures. In the Simin area (South Hamedan) stromatic and in the Darreh-Omar (Toyserkan) area ophtalmitic structures are abundant.
Ali Asghar Sepahi Gerow, Seyedeh Razieh Jafari, Mohssen Moazzen, Hossein Shahbazi   +3 more
doaj   +1 more source

An example of migmatite origin by dehydrating metamorphism [PDF]

Bulletin of the Geological Society of Finland, 1979
An unusual type of garnetiferous migmatite has been studied at Tåbor (Moldanubicum of southern Bohemia) characterized by a coarse patchy quartzo-felspathic neosome with conspicuously large garnet crystals and a biotite paragneiss paleosome.
E. Fediuková, M. Suk
doaj   +1 more source

Carboniferous-Permian tectono-metamorphic evolution of the Pelvoux Massif (External Crystalline Massif, Western Alps), with discussion on flow kinematics of the Eastern-Variscan Shear Zone

BSGF - Earth Sciences Bulletin, 2022
Based on new structural, petrological and U-Th-Pb geochronological data, a reappraisal of the Variscan tectono-metamorphic history of the Pelvoux Massif (External Crystalline Massif, French Alps) is proposed with the aim to understand the flow pattern ...
Fréville Kévin, Trap Pierre, Vanardois Jonas, Melleton Jérémie, Faure Michel, Bruguier Olivier, Poujol Marc, Lach Philippe   +7 more
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Deformation Behavior and Inferred Seismic Properties of Tonalitic Migmatites at the Time of Pre‐melting, Partial Melting, and Post‐Solidification

Geochemistry, Geophysics, Geosystems, 2021
As seismic data from the lower crust becomes more readily available, it is important to link seismic properties to the ongoing processes within lower crustal evolution.
Yilun Shao, Sandra Piazolo, Yongjiang Liu, Amicia L. Lee, Wei Jin, Weimin Li, Chenyue Liang, Quanbo Wen   +7 more
doaj   +1 more source

Physical Conditions of the Formation of Plagioclase Crystals Using Crystal Size Dispersion (CSD) in the Mafic Migmatites of Northeastern Takab

Journal of Economic Geology, 2023
The Zanjan-Takab complex is a metamorphic belt with NW-SE trend that includes gneiss, amphibolite and gneissic amphibolite, old metagranites, pelitic schists with migmatites and metaophiolites.
Haleh Ghorbani, Robab Hajialioghli, Mohsen Moazzen   +2 more
doaj   +1 more source

Petrogenesis of Mesoproterozoic Granites of the Swartoup Hills Region, Kakamas Domain, Namaqua Belt, South Africa

Frontiers in Earth Science, 2021
The Swartoup and Polisiehoek plutons in the Swartoup Hills (South Africa) formed during an episode of significant magma emplacement in the Mesoproterozoic Namaqua Sector of the Namaqua Metamorphic Province.
Steffen Hermann Büttner, Stephen Anthony Prevec, Graeme Alvin Schmeldt   +2 more
doaj   +1 more source

Metasedimentary Metatexites with Trondhjemitic Leucosomes from NE Sicily: Another Example of Prograde Water-fluxed Melting in Collisional Belts

Geosciences, 2020
Trondhjemitic leucosomes, hosted in late Variscan metasedimentary migmatites from the upper amphibolite-facies basement of the north-eastern Peloritani Mountains (southern Italy), have petrographic and geochemical features consistent with their origin as
Patrizia Fiannacca, Rosolino Cirrincione
doaj   +1 more source

Comparison of oil-bearing properties and oil mobility of shale with different lithologies in continental basins: a case study of the upper fourth member of Paleogene Shahejie Formation in Dongying Sag, Bohai Bay Basin

Shiyou shiyan dizhi, 2020
The shale in the upper part of the 4th member of Paleogene Shahejie Formation in the Dongying Sag of Bohai Bay Basin can be divided into two lithology types: calcareous mudstone and argillaceous limestone. The differences of organic matter abundance, oil-
Zheng LI
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