the lalezar granitoids crop out within volcanic successions of the urumieh-dokhtar magmatic assemblage (udma). these granitoids have a range from gabbro-diorites to granites in composition. the mineral compositions of the most felsic rocks are characterized by the abundances of na-plagioclase, quartz, alkali feldspar, biotite and hornblende. in the gabbro-diorite rocks, plagioclase (ca-rich), h...

The Lalezar granitoids crop out within volcanic successions of the Urumieh-Dokhtar Magmatic Assemblage (UDMA). These granitoids have a range from gabbro-diorites to granites in composition. The mineral compositions of the most felsic rocks are characterized by the abundances of Na-plagioclase, quartz, alkali feldspar, biotite and hornblende. In the gabbro-diorite rocks, plagioclase (Ca-rich), h...

The Peninsular Ranges batholith of southern California and Baja California, México, is well recognized as a prime example of an I-type Cretaceous batholith. Often overlooked, however, is a volumetrically signiÞ cant amount of pre-Cretaceous gneissic granite in the axial zone of the batholith. New U-Pb zircon age data conÞ rm that the metaluminous and peraluminous plutonic bodies were emplaced d...

the late eocene-early oligocene sarnowsar granitic rocks and many dacitic to rhyolitic dykesintruded in metamorphosed and metasomatized shale, sandstone, calcite and dolomite marbles andvolcaniclastic and pyroclastic rocks. as a result several million tons of iron ores formed within carbonaterocks in the sangan area. the sarnowsar granitic rocks are mainly granite to granodiorite, metaluminous,...

Abstract The Sao Joao do Sabugi Pluton (SJSP) (∼579 Ma) is one of the most expressive occurrences Ediacaran, syn- to post-collisional shoshonitic rocks in Rio Piranhas-Serido Domain, Borborema Province, NE Brazil. petrography, whole rock and mineral composition this pluton were investigated characterize its open-system magmatic differentiation processes. composed three groups: gabbro-diorite, w...

We present new viscosity measurements for melts spanning a wide range of anhydrous compositions including: rhyolite, trachyte, moldavite, andesite, latite, pantellerite, basalt and basanite. Micropenetration and concentric cylinder viscometry measurements cover a viscosity range of 10 to 10 Pas and a temperature range from 700 to 1650 °C. These new measurements, combined with other published da...

The widely distributed granitic intrusions in the Nubian Shield can provide comprehensive data for understanding its crustal evolution. We present new bulk-rock geochemistry and isotopic (zircon U-Pb Lu-Hf) from Haweit granodiorites Gabgaba Terrane (NE Sudan). dated zircons presented a 206Pb/238U Concordia age of 718.5 ± 2.2 Ma, indicating that they crystallized during Cryogenian. contain both ...

This work presents a considerable volume of new and compiled data indicating that arc magmatism in the western paleomargin Gondwana began Carboniferous continued during Permian Early Triassic. Subsequently, reactivated Middle Jurassic due to subduction Farallon Plate under continental paleomargin. The pluton belts are distributed from edge toward interior continent same orientation as slab (wes...