Results 41 to 50 of about 75 (67)

In‐situ migmatite and hybrid diatexite at Mt Stafford, central Australia

Journal of Metamorphic Geology, 1996
Metasedimentary gneisses show a rapid change in grade within a 10‐km‐wide low‐P/high‐T  regional aureole at Mt Stafford, Arunta Block, central Australia. Migmatites occur in all but the lowermost of five metamorphic zones, which are characterized by: (1) muscovite–quartz schist; (2) andalusite–cordierite–K‐feldspar granofels with small melt ...
J. E. GREENFIELD, G. L. CLARKE, M. BLAND, D. J. CLARK   +3 more
openaire   +1 more source

Schlieren formation in diatexite migmatite: examples from the St Malo migmatite terrane, France

Journal of Metamorphic Geology, 2003
AbstractSchlieren are trains of platy or blocky minerals, typically the ferromagnesian minerals and accessory phases, that occur in granites and melt‐rich migmatites, such as diatexites. They have been considered as: (1) unmelted residue from xenoliths or the source region; (2) mineral accumulations formed during magma flow; (3) compositional layering;
I. Milord, E. W. Sawyer
openaire   +1 more source

GEOCHEMICAL SIGNATURES OF METATEXITE AND DIATEXITE MIGMATITE WITHIN GWARZO LOW GRADE METASEDIMENTS NW NIGERIA

Science Forum (Journal of Pure and Applied Sciences), 2020
The study area shows a distinctive morphological and geochemical continuity from the early formed metasediments, to the metatexite (i.e. the banded orthogneiss and stromatic migmatite), to diatexite (i.e. nebulitic and nebulitic patch migmatite). The geochemistry indicates the decrease in Fe2O3, MgO, and TiO2 in the metatexite and diatexite with ...
Ahmed Sarki, Ahmed Haruna, Nasir Maiauduga   +2 more
openaire   +1 more source

A preliminary study of the siliceous and femic rock blocks in the Neoproterozoic diatexitic granite at Fuhu Hill in southwestern Guangdong, China

Geological Journal, 2021
The crystalline basement of Cathaysia Block is commonly believed to have formed before the Middle Neoproterozoic; however, the basement rock has seldom been reported in the eastern Cathaysia. Recently, numerous siliceous and femic rock blocks distributed in the diatexitic host granite were observed on the rocky beach of Fuhu Hill ...
Zhen Chen, Yongjiang Liu, Wei Jin, Feng Lou, Guoneng Chen   +4 more
openaire   +1 more source

Determination of the source rocks for the diatexites from the Edough Massif, Annaba, NE Algeria

Journal of African Earth Sciences, 2012
Abstract The crystalline Edough Massif is located in the oriental part of the Algerian coastline. It consists of two tectonically superposed units of gneisses, augen-gneisses and migmatitic gneisses in the lower unit and micaschists in the upper unit.
Zobir, Soraya Hadj, Mocek, Beate
openaire   +2 more sources

An in situ metatexite–diatexite transition in upper amphibolite facies rocks from Broken Hill, Australia

Journal of Metamorphic Geology, 2005
AbstractUpper amphibolite facies felsic gneiss from Broken Hill records the metatexite to schlieren diatexite to massive diatexite transition in a single rock type over a scale of tens to hundreds of metres. The metatexites are characterized by centimetre‐scale segregation of melt into leucosomes to form stromatic migmatite.
R. W. WHITE, N. E. POMROY, R. POWELL
openaire   +1 more source

Nd–Sr isotopic constraint to the formation of metatexite and diatexite migmatites, Higo metamorphic terrane, central Kyushu, Japan

International Geology Review, 2015
ABSTRACTMetatexite and diatexite migmatites are widely distributed within the upper amphibolite and granulite-facies zones of the Higo low-P/high-T metamorphic terrane. Here we report Nd–Sr isotopic and whole rock composition data from an outcrop in the highest-grade part of the granulite-facies zone, in which diatexite occurs as a 3 m-thick layer ...
Kenshi Suga, Tzen-Fu Yui, J. Gregory Shellnutt, Tsay-Way Wu, Yasushi Mori, Kazuhiro Miyazaki, Bor-Ming Jahn   +6 more
openaire   +1 more source

Morphological Studies and Petrogenetic Relationship of Metatexite Cum Diatexite Migmatites Around Buzaye Area, Bauchi, Nigeria

2022
The geology and petrogenetic studies of migmatites around Buzaye area were conducted to evaluate their morphological units and geochemical affinity. Field mapping revealed migmatite with stromatic structures represented the metatexite while parts of the migmatite with schollen and schlieren structures with granitic component represent the diatexite ...
SALISU, Sadiq Mohammed, HARUNA, Ahmed Isah, HALILU, Maimunatu, ABDULLAHI, Faisal, AHMAD, Tahir Garba   +4 more
openaire   +1 more source

Petrological and geochemical variations of a turbidite-like metasedimentary sequence over the metatexite to diatexite transition within the Pampean Orogen, Argentina

International Journal of Earth Sciences, 2019
Large masses of turbidite systems have been metamorphosed in orogenic systems during Earth’s history. Under granulite-facies conditions, the transformation of turbidite sedimentary successions into metasedimentary sequences drives intracrustal differentiation by anatexis and melt–residuum separation.
Juan E. Otamendi, Matías G. Barzola, Alina M. Tibaldi, Eber A. Cristofolini, Antonio M. Álvarez-Valero, Alejandro H. Demichelis   +5 more
openaire   +2 more sources

Petrogenesis of metatexite and diatexite migmatites determined using zircon U–Pb age, trace element and Hf isotope data, Higo metamorphic terrane, central Kyushu, Japan

Journal of Metamorphic Geology, 2014
AbstractMetatexite and diatexite migmatites are widely distributed within the upper amphibolite and granulite facies zones of the Higo low‐P/high‐Tmetamorphic terrane. Here, we report data from an outcrop in the highest grade part of the granulite facies zone, in which diatexite occurs as a 3 m thick layer between 2 m thick layers of stromatic ...
K. Maki, T‐F. Yui, K. Miyazaki, M. Fukuyama, K‐L. Wang, U. Martens, M. Grove, J. G. Liou   +7 more
openaire   +1 more source