Results 21 to 30 of about 75 (67)

Geochemistry and petrogenetic evolution of the diatexites of Central Kerala, India

Journal of Earth System Science, 1984
The hornblende-biotite gneisses of Central Kerala which cover approximately 490km2 exhibit schlieric and nebulitic structures, tending towards a homophanous nature and are classified here as diatexites. Mafic protoliths and restite biotite, each representing the refractory residuum of two independent partial melting episodes are widely present in the ...
P K Rajan, M Santosh, K K Ramachandran
openaire   +2 more sources

Formation and Evolution of Granite Magmas During Crustal Reworking: the Significance of Diatexites [PDF]

Journal of Petrology, 1998
(Taylor & McLennan, 1985), the physical processes inA continuous section through reworked Archaean crust records the volved, particularly how granite magma is formed, remain generation of granitic magma and its subsequent development in the controversial (Miller et al., 1988; White & Chappell, Opatica subprovince in the Canadian shield.
openaire   +1 more source

Formation of Diatexite Migmatite and Granite Magma during Anatexis of Semi-pelitic Metasedimentary Rocks: an Example from St. Malo, France [PDF]

Journal of Petrology, 2001
Abstract Petrological and geochemical variations are used to investigate the formation of granite magma from diatexite migmatites derived from metasedimentary rocks of pelitic to greywacke composition at St. Malo, France. Anatexis occurred at relatively low temperatures and pressures (<800°C, 4–7 kbar), principally through ...
I. MILORD, E. W. SAWYER, M. BROWN
openaire   +1 more source

Hornblende Chemistry in Meta- and Diatexites and its Retention in the Source of Leucogranites: an Example from the Karakoram Shear Zone, NW India [PDF]

Journal of Petrology, 2012
A suite of calc-alkaline arc rocks in the Pangong Metamorphic Complex in the Karakoram Shear Zone, Ladakh, NW India, was migmatized at upper amphibolite facies under water-fluxed conditions. Metaand diatexites contain abundant hornblende in both leucosome and melanosome.These form idiomorphic, poikilitic megacrysts in the leucosome and in melanosome ...
Henning Reichardt, Roberto F. Weinberg
openaire   +1 more source

Confronting Episodic vs. Continuous Heat Sources in Long‐Lived Hot Orogens: Insights From Petrochronological Studies in the Nova Venecia Complex, Araçuaí Orogen (SE Brazil)

Journal of Metamorphic Geology, Volume 43, Issue 9, Page 863-890, December 2025.
ABSTRACT Orogenic belts that sustain elevated temperatures at intermediate crustal depths for tens of millions of years are known as hot orogens. The evolution of these hot orogens is largely influenced by thermal maturation, primarily driven by the distribution of heat‐producing elements (HPEs), such as K, Th and U in the overthickened crust.
Lucas R. Schiavetti, Vinicius T. Meira, Sean Mulcahy, Jeffrey D. Vervoort, Peter L. Baker, George L. Luvizotto, Ricardo I. F. Trindade   +6 more
wiley   +1 more source

Applications and limitations of thermobarometry in migmatites and granulites using as an example rocks of the Araçuaí Orogen in southern Bahia, including a discussion on the tectonic meaning of the current results

Brazilian Journal of Geology
In southern Bahia, there are outcrops of migmatites and granulites in the Jequitinhonha Complex, which is part of the northern portion of the Araçuaí Orogen.
Renato Moraes, Christian Nicollet, Johildo Salomão Figueiredo Barbosa, Reinhardt Adolfo Fuck, Antônio Rabelo Sampaio   +4 more
doaj   +1 more source

Fast and Spatially Heterogeneous Cooling Rates at Amphibolite‐Facies Conditions in the Lepontine Alps (Switzerland)

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 11, November 2025.
Abstract The Lepontine dome (European Central Alps) is constituted by basement nappes under Alpine regional Barrovian metamorphism, yet the duration and pattern of its post‐peak amphibolite‐facies cooling remain uncertain. We examine garnet‐rim compositional re‐adjustment and employ inverse multicomponent diffusion modeling to estimate apparent cooling
A. Tagliaferri, E. Moulas, S. M. Schmalholz, F. L. Schenker   +3 more
wiley   +1 more source

Large Contact Aureole Overprinting the Ryoke Regional Metamorphic Zoning: Insights From the Takato–Komagane Area, Central Japan

Island Arc, Volume 34, Issue 1, January/December 2025.
ABSTRACT The Ryoke metamorphic belt records the conditions of the middle–upper crust during Cretaceous crustal deformation and magmatism. To understand the development and evolution of the middle–upper crust, it is important to investigate the thermal structure of the Ryoke metamorphic belt.
Takuro Yoshioka, Hideo Takagi, Hiroyuki Nagahama, Tomoki Taguchi   +3 more
wiley   +1 more source

Carboniferous Barrovian to Permian Buchan‐type metamorphic cycles in the Mongolian Altai Zone: Implication for pressure cycles in accretionary orogens

Journal of Metamorphic Geology, Volume 42, Issue 7, Page 979-1033, September 2024.
Abstract In the Altai Accretionary Wedge, several periods of Barrovian‐ and Buchan‐type metamorphic cycles were dated from Ordovician to Permian. However, the timing and link between these cycles are not clear, and their causes are debated. In order to contribute to the understanding of Barrovian‐ to Buchan‐type evolution of the accretionary wedges, we
Carmen Aguilar, Pavla Štípská, Karel Schulmann, Andrew R. C. Kylander‐Clark, Ondrej Lexa, Turbold Sukhbaatar, Vít Peřestý, Yingde Jiang, Pavel Hanžl   +8 more
wiley   +1 more source

Circa 1.9 Ga Rae‐Hearne collision from Lu–Hf garnet chronology in eclogites

Terra Nova, Volume 36, Issue 4, Page 284-291, August 2024.
Abstract Canada's northern cratons record a complex poly‐metamorphic evolution in response to multiple orogenic events. The Snowbird Tectonic Zone (STZ), the principal suture between the Archean Rae and Hearne cratons, is a highly debated structure; it is argued to have accommodated modern‐style accretion in either the Neoarchean (2.6–2.5 Ga) or ...
J. A. Cutts, D. Regis, S. J. Pehrsson, R. Graziani, D. C. Petts, M. A. Smit, B. Knox   +6 more
wiley   +1 more source