Results 71 to 80 of about 10,226 (223)
High‐Titanium Zircon Rims in Rhyolite – A Reflection of Adiabatic Ascent?
Geological Journal, Volume 61, Issue 4, Page 1029-1040, April 2026.The ascent of granitic magma from source to emplacement is rapidly achieved through dyking, resulting in negligible heat loss to the surrounding wallrock (i.e., adiabatic). Zircon growth during ascent can record the changing magma conditions including adiabatic cooling and heating, resulting in high titanium rims on low titanium cores without ...
Carson Kinney +2 more
wiley +1 more source
P-T path fluid evolution in the Gross Spitzkoppe granite stock, Namibia [PDF]
Bulletin of the Geological Society of Finland, 2002 The Gross Spitzkoppe granite stock (GSS) is a zoned 30 km2 epizonal intrusion that consists of three main granites: 1) medium-grained biotite granite (marginal), 2) a coarse-grained biotite granite, and 3) a central, porphyritic granite.
S. Frindt, M. Poutiainen
doaj +1 more source
Rifting and arc-related early Paleozoic volcanism along the North Gondwana margin: geochemical and geological evidence from Sardinia (Italy) [PDF]
, 2012 Three series of volcanic rocks accumulated during the Cambrian to Silurian in the metasediment-dominated Variscan basement of Sardinia. They provide a record of the changing geodynamic setting of the North Gondwana margin between Upper Cambrian and ...
BUZZI L +3 more
core +1 more source
Episodic Rifting of a Large Igneous Province Concentrated Along a Microcontinent Boundary
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.Abstract Many large igneous provinces (LIPs) comprise once contiguous magmatic products that are now fragmented across multiple tectonic plates. Emplacement of these voluminous magmatic products is commonly coeval with, or shortly followed by, fragmentation into constituent domains.
Jeremy L. Asimus +11 more
wiley +1 more source
The Oripää granite, SW Finland: characterization and significance in terms of Svecofennian crustal evolution [PDF]
, 2001 Granitoid rocks of the Finnish Svecofennian have recently been at the focus of active research and new ideas regarding their petrogenesis and tecton-ic evolution have been presented by several ...
Mikko Nironen, Tapani Rämö
core +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.Abstract Comprehension of the ophiolitic mélange plays a key role in the tectonic reconstruction of an ancient orogenic belt in terms of plate tectonics. The tectonic nature of the NNW‐trending southern Jinshajiang ophiolitic mélange is still controversial.
Di Xin +4 more
wiley +1 more source
The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)
Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti +5 more
wiley +1 more source
Geochemistry of apatite in various felsic rocks of the Piranshahr plutonic complex: an approach to investigate magmatic evolution [PDF]
علوم زمین خوارزمی, 2023 The felsic intrusive rocks in the Piranshahr plutonic complex consist of three groups: syenite, nepheline-syenite, and alkali-feldspar granite. They are co-genetic and formed approximately 40 million years ago.
Seyed Ali Mazhari, Kwan-Nang Pang
doaj
Geochemistry of syenite of the Phalaborwa Carbonatite Complex, South Africa [PDF]
, 2003 We surveyed the Spitskop syenite pipe,one of the satellite bodies of the Phalaborwa Carbonatite Complex located in northeastern Transvaal,South Africa. This pipe is composed of the inner cumulus syenite and outer ring syenite.The brecciation zone between
Hiroo Kagami +4 more
core +1 more source
Terra Nova, Volume 38, Issue 2, Page 97-105, April 2026.ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito +4 more
wiley +1 more source