Results 21 to 30 of about 3,223 (190)

Multiple growth mechanisms of jadeite in Cuban metabasite

European Journal of Mineralogy, 2012
Samples of rocks reported in the literature to be jadeite jade from the subduction-zone complex of the Escambray Massif in central Cuba have been studied by optical and transmission electron microscopy, electron microprobe and hot-cathode cathodoluminescence (CL) microscopy.
Walter V. Maresch, Christiane Grevel, Klaus Peter Stanek, Hans-Peter Schertl, Michael A. Carpenter   +4 more
openaire   +1 more source

Mineral chemistry and geothermobarometry of metabasites of the Majerad igneous-metamorphic complex (SE of Shahrood)

Journal of Economic Geology, 2020
Introduction Thermobarometric models based on the chemical equilibrium among coexisting mineral-mineral or mineral-melts pairs are useful tools widely used to estimate the P-T path and chemical evolution during igneous processes. The high sensitivity of
Marzieh Veiskarami, Mahmoud Sadeghian, Habibollah Ghasemi, Minggou Zhai   +3 more
doaj   +1 more source

Structural history of the southwestern corner of the Kaapvaal Craton and the adjacent Namaqua realm: new observations and a reappraisal [PDF]

, 1991
The rocks along the southwestern margin of the Kaapvaal Craton were deformed up to 7 times during the Early to Middle Proterozoic. The oldest deformation D1 is recorded in the N-S-trending Uitkoms cataclasite of pre-Makganyene age (>2.24 Ga) on the ...
Altermann, Wladyslaw, Hälbich, Ingo W.
core   +1 more source

Careón ophiolite, NW Spain: Suprasubduction zone setting for the youngest Rheic Ocean fl oor [PDF]

, 2007
The Careón ophiolite (Galicia, NW Iberian Massif) shows lithological and geochemical features suggestive of an origin in a suprasubduction zone setting.
Arenas Martín, Ricardo, Díaz García, Florentino, Gómez Barreiro, Juan, Martínez Catalán, José Ramón, Pearce, Julian A., Sánchez Martínez, Sonia   +5 more
core   +1 more source

Petrogenetic and mineralogical constraints in metamorphic-plutonic complex of N-Bijar, Kordestan, Iran [PDF]

پترولوژی
IntroductionThe Sanandaj-Sirjan metamorphic-magmatic zone (SSZ) (with 1500 km in length and 150-200 km in width) along with the Urumieh-Dokhtar magmatic arc as well as the folded-thrust belt of Zagros comprise the Zagros orogeny in south west of Iran ...
Maryam Bafandeh, Abbas Asiabanha, Mohsen Nadrabady   +2 more
doaj   +1 more source

Ophiolitic Remnants from the Upper and Intermediate Structural Unit of the Attic-Cycladic Crystalline Belt (Aegean, Greece): Fingerprinting Geochemical Affinities of Magmatic Precursors

Geosciences, 2017
The ophiolitic rocks of the Attic-Cycladic crystalline belt are considered of key importance for understanding the Mesozoic tectonic evolution of the Aegean region. Unresolved questions concern their tectono-stratigraphic relationships across the region.
Christina Stouraiti, Iakovos Pantziris, Charalampos Vasilatos, Christos Kanellopoulos, Panagiotis Mitropoulos, Panagiotis Pomonis, Robert Moritz, Massimo Chiaradia   +7 more
doaj   +1 more source

Geology of the Sandercock Nunataks in Enderby Land, East Antarctica (Reports of the Japanese Antarctic Research Expedition)

Antarctic Record, 1972
The Sandercock. Nunataks (68°33'S, 52°07'E) are composed of several small nunataks which are tentatively named A, B, C and D. Nunatak "A" consists mainly of hornblende-biotite gneiss and Nunatak "B" of hypersthene-garnet gneiss and garnet gneiss. Nunatak
Kazuyuki SHIRAISHI, Okitsugu WATANABE, Koshiro KIZAKI   +2 more
doaj   +1 more source

Stratigraphy of the metamorphic rocks of Niğde Massif and new evidence of Triassic rifting of the Inner Tauride Ocean (Central Anatolia, Türkiye)

Bulletin of the Mineral Research and Exploration, 2023
Metamorphites of Niğde Massif, which form the basis of study area covering the Niğde vicinity in Central Anatolia, are composed of Late Devonian Gümüşler, Carboniferous-early Permian Kaleboynu late Permian Kızıldağ formation and unconformable Triassic ...
Halil Yusufoğlu, Meftun Kerem Sönmez, Osman Ersin Koralay, Osman Candan, Muhamed Çoban, Ali Ekber Akçay, Metin Beyazpirinç, Mustafa Kemal Özkan   +7 more
doaj   +1 more source

Geochemistry, metamorphic evolution and tectonic significance of metabasites from Caçapava do Sul, southern Brazil

Brazilian Journal of Geology, 2019
This paper proposes the generation and closure of a proto-ocean and formation of an island arc in the Neoproterozoic Passo Feio Metamorphic Complex (PFMC), Caçapava do Sul region, southern Brazil.
Victor Bicalho, Marcus Vinicius Dorneles Remus, Rafael Rizzardo, Norberto Dani   +3 more
doaj   +1 more source

The new age data and pre-Paleogene stratigraphy of the Kırşehir Massif, Central Anatolia

Bulletin of the Mineral Research and Exploration, 2022
The metamorphics belonging to the Kırşehir Massif, which form the pre-Paleogene basement units in Central Anatolia around Kırşehir, are formed from bottom to top by conformable and transitional Late Devonian Kalkanlıdağ, Carboniferous-Early Permian ...
Metin Beyazpirinç, Ali Ekber Akçay, Mustafa Kemal Özkan, Meftun Kerem Sönmez, Mustafa Dönmez   +4 more
doaj   +1 more source