Oxygen isotope ratios of zircon (Zc) from intrusives exposed in the Tehachapi Mountains, southern California, reveal large inputs of high-dO supracrustal contaminant into gabbroic and tonalitic magmas deep (N30 km) in the Cretaceous Sierra Nevada batholith. High dO(Zc) values (7.8F0.7x) predominate in the deep parts of the batholith, but lower values (6.1F0.9x) occur in shallower parts. This in...

The Jura-Cretaceous Peninsular Ranges batholith (PRb) of southern and Baja California is a remarkable example of a zoned batholith containing distinct oceanic (western) and continental (eastern) basements. The transition between these basements is marked by a crustal-scale boundary along which distinct volcanosedimentary, structural, and metamorphic histories evolved during Mesozoic orogenesis....

The Altiplano-Puna Magma Body (APMB) in the Central Andes is the largest imaged magma reservoir on Earth, and is located within the second highest orogenic plateau on Earth, the Altiplano-Puna. Although the APMB is a first-order geologic feature similar to the Sierra Nevada batholith, its role in the surface uplift history of the Central Andes remains uncertain. Here we show that a long-wavelen...

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...

Background: High concentrations of various heavy metals of mine tailings can easily contaminate the environment. Such materials need monitoring and remediation to prevent them from polluting the environment and food chain. Materials & Methods: The concentrations of certain metals were evaluated in the soil samples at Sorkheh and Mazraeh copper mining areas in northwestern Iran, using three r...

[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...