The Chadegan metamorphic complex is a WNW-ESE- trending antiformal structure located in Sanandaj-Sirjan structural zone, Iran.The inner core of the structure is made of orthogneiss, containing eclogitic lenses. Schists and marbles lie structurally above theorthogneiss and crop out in the external limbs of the antiformal dome. Two main deformational episodes have been documented in theschists an...

, ABSTRACT Metabasaltic rocks in the Klamath Mountains of California with 'komatiitic' major element concentrations were investigated in order to elucidate the origin of the magnesian signature. Trace-element concentrations preserve relict igneous trends and suggest that the rocks are not komatiitic basalts, but im~at~re arc rocks and within-plate alkalic lavas. Correlation of 'excess' MgO with...

In the Western Gneiss Region in Norway, mafic eclogites form lenses within granitoid orthogneiss and contain best record of pressure temperature evolution this ultrahigh-pressure (UHP) terrane. Their exhumation from UHP conditions has been extensively studied, but their prograde rarely quantified although it represents a key constraint for tectonic history area. This study focused on well-prese...

Abstract The Brenner normal fault bounds the Tauern Window to west and accommodated a significant portion of orogen-parallel extension in Eastern Alps. Here, we use zircon (U–Th)/He, apatite fission track, (U–Th)/He dating, thermokinematic modeling, topographic analysis constrain exhumation history western footwall fault. ZHe ages from an E–W profile (parallel slip direction fault) decrease wes...

the eocene volcanic rocks from the southwest of the jandaq (kuh-e-godar-e-siah, central-east iran micro-continent) are andesitic basalt and andesite in composition. these rocks contain xenoliths with granulitic mineralogy. mineral assemblage of these xenoliths is plagioclase + phlogopite + corundum + sillimanite + chlorite + phengite with granublastic, poiklioblastic and foliated textures in th...

the chadegan metamorphic complex is a wnw-ese- trending antiformal structure located in sanandaj-sirjan structural zone, iran.the inner core of the structure is made of orthogneiss, containing eclogitic lenses. schists and marbles lie structurally above theorthogneiss and crop out in the external limbs of the antiformal dome. two main deformational episodes have been documented in theschists an...

As one of the youngest back-arc basins, evolutionary behavior magmatic volatiles in Eastern Manus Basin has been poorly studied. Recently, apatite received widespread attention for its powerful function recording information on volatiles. In this paper, by determining major element compositions and primary volatile abundances (F, Cl, SO3) apatites dacite, we analyze before magma eruption Basin,...