نتایج جستجو برای: monzogranite

تعداد نتایج: 108  

آهین, بهروز, سیاه چشم, کمال, علی جانی, لیلا, کلاگری, علی اصغر,

The study area is located about 25 km northwest of Takestan city, within Tarom-e-Sofla metallogenic belt. This area is covered by a widespread Eocene andesite to dasite volcanic rocks affected by Oligo-Miocene monzogranite to granodiorite igneous bodies which altered them to silicic, argillic zones as long as hypogene sulfide vein-veinlet mineralization (e.g. galena, sphalerite, pyrite, rare ch...

طهماسبی, زهرا ,

Based on the field observations host rock of tourmaline nodules in the Dehgah and Sarsakhti area are acidic dikes (Aplite) and monzogranite respectively. In these areas, nodules composed of tourmaline, quartz, alkali-feldspar, but leuco minerals component in Dehgah nodule are less than Sarsakhti area. The negative anomaly of Eu, enrichment in the light REE (LREE), decrease of HREE, and  fractio...

Journal: :Lithos 2021

We describe the Jebel Aja igneous intrusion (JAII), which sits at farthest northeastern edge of exposed Arabian Shield in Saudi Arabia. The JAII consists late Neoproterozoic post-collisional A-type granites, and was emplaced during tectonic extension. It is a composite pluton consisting granitic core (monzogranite, syenogranite alkali feldspar granite) surrounded by later phase alkaline peralka...

Journal: :Geological Magazine 2021

Abstract The southeastern Central Asian Orogenic Belt (CAOB) records the assembly process between several micro-continental blocks and North China Craton (NCC), with consumption of Paleo-Asian Ocean (PAO), but whether S-wards subduction PAO beneath northern NCC was ongoing during Carboniferous–Permian time is still being debated. A key issue to resolve this controversy Carboniferous magmatism i...

Journal: :Frontiers in Earth Science 2022

South China is a well-known grand felsic igneous rocks province. However, it still controversial and not well understood whether the Mesozoic tectono-magmatic pattern dominated by subduction of paleo-Pacific oceanic plate. In this study, we address question concentrating on long-term evolutionary Guandimiao batholith, which has complex lithofacies with different formation ages can be superb rec...

2003
F. A. Macdonald J. A. Bunting Sara E. Cina

Introduction: Shock-metamorphic effects including shatter cones, planar deformation features (PDFs) in quartz grains, and both E-and S-type pseu-dotachylites were discovered in deeply eroded Ar-chean granites near the Yarrabubba homestead in Western Australia (119°50'E, 27°10'S). Preliminary estimates indicate that the Yarrabubba impact structure is of a Paleoproterozoic age and at least 30 km ...

Journal: :Geological Society of America Bulletin 2021

Abstract Bulk rock geochemistry and sensitive high-resolution ion microprobe zircon geochronology of igneous metaigneous rocks the Évora gneiss dome, located to north reworked Rheic Ocean suture zone in southwest Iberian Variscan belt, reveal a succession magmatic melting events lasting ~30 m.y. between ca. 341–314 Ma. The study detailed field relationships orthomigmatites (i.e., migmatites fro...

Introduction Sand ramp is a kind of sand dune located on or in the foot of some mountains slopes of arid and semi-arid regions. Although these landforms does not differ from other types of sand dunes in these areas apparently, but, there are significant differences between them from the point of view of slope, sediment grain size, Morphology, sediment homogeneous, stratigraphy, laminatio...

A.A.T. Shabani

Compositions of biotite from three different rock types of Mashhad granitoids, i.e., granodiorite, monzogranite and leucogranite in NE of Iran have been documented by electron microprobe and wet chemistry for Fe3+ and Fe2+. Mashhad granitoids have been geochronologically and petrologically grouped into G1 and G2 phases. Microprobe data show that the total Fe contents in biotite from G2 leucogra...

Journal: :Lithos 2021

At Hadhb't Ad-Dayheen, in the central Arabian Shield, a post-collisional igneous complex called Ad-Dayheen intrusion is exposed. It was emplaced Early Ediacaran (613–625 Ma), during final tectono-magmatic stage of Shield development. Despite limited and discontinuous ring-shaped outcrops due to alluvial cover later faulting, three pulses can be recognized field: an early pulse monzogranite; sec...

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