Results 81 to 90 of about 5,077 (206)

Discovery of an albite gneiss from the Ile de Groix (Armorican Massif, France): geochemistry and LA-ICP-MS U-Pb geochronology of its Ordovician protolith [PDF]

, 2011
International audienceFor the first time, an albite orthogneiss has been recognised and dated within the HP-LT blueschist facies metabasites and metapelites of the Ile de Groix.
El Korh, Afifé, Schmidt, Susanne Theodora, El Korh, A., Ulianov, Alexey, Bruguier, Olivier, Schmidt, Susanne, Th., Schmidt, Susanne,, Schmidt, S.Th., Olivier Bruguier, Afifé El Korh, Alexey Ulianov, El Korh, Alifé, Michel Ballèvre, Ballèvre, M., Ulianov, A., Ballevre, Michel, Bruguier, O., Susanne Th. Schmidt, El Korh, A.S., Schmidt, S.T.   +19 more
core   +2 more sources

Petrochemistry and P–T path for garnet mica schists from Patharkhola, Almora

Discover Geoscience
This study presents petrographic, geochemical and thermobarometric analyses of garnet mica schists from Patharkhola area to understand their petrogenesis, protolith characteristics and pressure–temperature evolution.
Haritabh Rana, Harel Thomas
doaj   +1 more source

On the Rhodopean protoliths and their Middle Jurassic to Early Cretaceous evolution. A review

Geologica Balcanica
The Rhodope Massif represents a large high-grade metamorphic complex situated in the Balkan Peninsula, straddling the border between Bulgaria and Greece. Geological studies carried out during the last thirty years clearly established that the complex is composed of three major lithotectonic units characterized by differing protolith ages and Alpine ...
Kounov, Alexandre, Gerdjikov, Ianko
openaire   +3 more sources

Flow-stratigraphy and geochemical variants of Bhadrajan volcanics, Jalore district, Rajasthan: Implications for a heterogeneous protolith

, 1998
The Malani volcanics exposed in a curvilinear pattern around Bhadrajan are characterised by the presence of eight flows of rhyolitic to dacitic composition and have chemical characteristics similar to within plate, A-type granitic rocks.
MAHESHWARI A, COLTORTI, Massimo, CHITTORA V. K   +2 more
core  

High-pressure melanocratic rocks of Anrakhai sialic massif (Southern Kazakhstan): the features of mineral, chemical compositions and metamorphism paths

Известия высших учебных заведений: Геология и разведка, 2015
In the structure of Anrakhai massif of Chu-Ili region (Southern Kazakhstan) metamoiphic formations of high-pressure conditions derivation (under eclogite facies field) were identified; the rocks are represented by eclogites and garnet clinopiroxenites ...
A. V. Pilitsyna, A. A. Tretyakov, K. E. Degtyarev, E. V. Kovalchuk   +3 more
doaj   +2 more sources

Triassic Retrograde Metamorphism and Anatexis in the Sulu Orogenic Zone, Central China: Constraints from U–Pb Ages, Trace Elements, and Hf Isotopic Compositions of Zircon

Applied Sciences
We report information on the protolith, the Triassic retrograde metamorphism, and anatexis recorded in zircons extracted from granitic gneiss and biotite schist in the Sulu orogenic zone, central China.
Yongkang Ye, Hengcong Lei, Fei Xia, Hui Zhang, Congjun Yu   +4 more
doaj   +1 more source

What Controls Finger‐Shaped Transformation Patterns? A Numerical Approach to Eclogitization

Geochemistry, Geophysics, Geosystems
Metamorphic transformations in subduction lithosphere are triggered by pressure and temperature changes occurring under stress. This anisotropic stress field can in turn be locally altered by the transformation pattern, as reactions induce significant ...
A. Cochet, P. Yamato, M. Baïsset, T. Duretz, L. Labrousse   +4 more
doaj   +1 more source

Geochemistry and petrogenesis of quartz biotite schist hosting mineralized pegmatite in Falansa Southwestern Nigeria

Discover Geoscience
Metamorphic processes during the Proterozoic era, undoubtedly, played significant roles in shaping the mineralized schist belts within the polycyclic Precambrian basement complex of southwest Nigeria. This study investigated the petrological, geochemical
Razak O. Jimoh, Adegoke O. Afolabi, Rofiat R. Isiaq, Rufai Ayuba, Razak G. Oladimeji   +4 more
doaj   +1 more source

Rare-earth element contents of Kizildag and Kemiklitepe bauxite deposits, central Tauride, Turkey: implications for REE potential in bauxites

, 2021
The Kizildag and the Kemiklitepe bauxite deposits are located in the Bolkardag bauxite province, which is the second most important Turkish province for bauxite production after Seydisehir-Akseki.
Hepvidinli, Bihter, Hanilci, Nurullah
core  

Trace Element Systematics and Zoning in Rutile: Implications for Thermometry & Protolith Applications in High-Pressure/Low-Temperature (HP/LT) Metamorphic Rocks

This study aims to resolve inconsistencies in using the mineral rutile as a geothermometer and protolith indicator in subduction zone environments by investigating how pressure-temperature paths, thermal gradients, protoliths, and fluid-rock interaction ...
Adansi, Mabel
core   +1 more source