The Iron Mask batholith is an Early Jurassic composite alkaline intrusion located southwest of Kamloops in southcentral British Columbia (Figure 2-6-l). It lies in the southern portion of the Quesnel trough in the lntermontane tcctonic belt. It is a northwest-trending body approximately 22 kilomctres long and 5 kilometres wide intruding volcanic and sedimentary rocks of the eastern belt of the ...

Detrital zircon U-Pb ages for 30 Late Jurassic and Cretaceous sandstones from the Eastern Province of eastern New Zealand, combined with previously-published geochronological and palaeontological data, constrain the time of deposition in the Pahau and Waioeka terranes of the Cretaceous accretionary margin of Zealandia, and their adjacent cover strata. The zircon age patterns also constrain poss...

Cretaceous plutonic rocks of the southern Sierra Nevada batholith between latitudes 35.5°N and 36°N lie in a strategic position that physically links shallow, subvolcanic levels of the batholith to lower-crustal (~35 km deep) batholithic rocks. This region preserves an oblique crustal section through the southern Sierra Nevada batholith. Prior studies have produced large U/Pb zircon data sets f...

We present an original geological map of the north-eastern Serre Batholith (southern Italy), together with new field and petrographic data its main five granitoid units. Our study provides overall picture a c. 13-thick floor-to-roof batholith exposure, focusing on relationships between magmatic units, which were sequentially emplaced at depth from 23 to 6 km, in time interval 297 Ma 292 Ma. Ind...

We present evidence for a thick ( 100 km) sequence of cogenetic rocks which make up the root of the Sierra Nevada batholith of California. The Sierran magmatism produced tonalitic and granodioritic magmas which reside in the Sierra Nevada upperto midcrust, as well as deep eclogite facies crust/upper mantle ma®c±ultrama®c cumulates. Samples of the ma®c±ultrama®c sequence are preserved as xenolit...

Abstract Accurate reconstruction of the Late Cretaceous paleogeography and tectonic evolution western North American Cordilleran margin is required to resolve long-standing debate over proposed large-scale, orogen-parallel terrane translation. The Nanaimo Basin (British Columbia, Canada) contains a high-fidelity record orogenic exhumation basin subsidence in southwestern Canadian Cordillera tha...

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...

[1] Lateral variations of the crustal structure in southern California are determined from receiver function (RF) studies using data from the Southern California Seismic Network broadband stations and Los Angeles Regional Seismic Experiment surveys. The results include crustal thickness estimates at the stations themselves, and where possible, cross sections are drawn. The large-scale Moho dept...