Synneusis, the drifting together and systematic attachment of crystals in a melt, is involved in three of the known origins for mantled feldspars: (1) overgrowth, (2) exsolution, and (3) filling of skeletal plagioclase. Quartz latite dikes of the Chocolate Mountains, California, contain plagioclase crystals in parallel and twinned synneusis. Sanidine mantles consisting of segments, each crystal...

[1] Garnet pyroxenites are the most common deep lithospheric xenolith assemblages found in Miocene volcanic rocks that erupted through the central part of the Sierra Nevada batholith. Elemental concentrations and isotope ratios are used to argue that the Sierra Nevada granitoids and the pyroxenite xenoliths are the melts and the residues/cumulates, respectively, resulting from partial melting/f...

This study analyses the joint system of Middle Miocene Osumi granodiorite batholith in southern Kyushu, Southwest Japan. The analysis included 916 joints at 96 localities covering northern, middle, and domains exposed area batholith. Two major sets steep striking NNW ENE a minor set gentle are recognized northern middle domains. further NS EW with domain. Previous paleomagnetic studies indicate...

Abstract The detrital zircons in tills overlying the Guichon Creek batholith, British Columbia, Canada, have trace element concentrations and ages similar to those of from bedrock samples which they are interpreted been sourced. Rocks core batholith that host porphyry copper mineralization distinct zircon compositions relative distal, barren margin. We analyzed 296 separated 12 subglacial till ...

Although the voluminous granitoids that constitute upper crust of Sierra Nevada batholith (California) have been investigated in detail, comparatively few studies focus on origin mafic bodies at similar crustal levels. Here, we present field and petrographic observations, geochronology, geochemistry Hidden Lakes complex central-eastern batholith. Our results show comprises norites, gabbros, mon...

three granitoid bodies, shirkuh batholith, kaffe abad and ader bolandan are exposed in nw yazd, cutting across the naiband formation (upper triassic), and overlain by cretaceous formations. shirkuh batholith is most likely of jurassic age. it seems to be the first and the most significant episode of magmatism in studied area which occurred in middle jurassic (late cimmerian) time. on the other ...

structural study by Glover (19%). His 1:25 000-scale map of the Sununit Pass area overlaps thc western pan of the Creston map. area and has been incorporated in this study (Figure 1). Stratigraphic divisions adopted by Glover (following those of Rice, 1941) are largely maintained here. A thesis by 13arrett (1982) describes structures in the Bayonne batholith, along the northern edge of the Cr...