The San Emigdio and related Pelona, Orocopia, Rand and Sierra de Salinas schists of southern California were underplated beneath the southern Sierra Nevada batholith and adjacent southern California batholith along a shallow segment of the subducting Farallon plate in Late Cretaceous to early Tertiary time. These subduction accretion assemblages represent a regional, deeply exhumed, shallowly d...

The Core Zone of the Southeastern Churchill Province, northeastern Laurentia, is a composite of Paleoproterozoic lithotectonic domains assembled in the vise between obliquely colliding Archean Superior and North Atlantic cratons between ca. 1860 and 1810 Ma. Detailed geological and U–Pb geochronological studies of domains in the southern Core Zone highlight significant differences in Archean an...

Structural analyses combined with new U-Pb zircon and titanite geochronology show how two Early Cretaceous transpressional shear zones initiated grew through a nearly complete section of continental arc crust during oblique convergence. Both reactivated Carboniferous faults that penetrated the upper mantle below Zealandia's Median Batholith but opposite growth patterns dissimilar relationships ...

The South Mountain Batholith (SMB; Nova Scotia, Canada) is the largest composite batholith exposed in Appalachians and lies entirely within most outboard Meguma terrane. In situ CA–TIMS U–Pb dating isotopes (Lu–Hf, O) geochemistry for zircon from all phases of SMB constrain its source as well evolution. CA–ID–TIMS yields emplacement (autocryst) ages, indicating a transition granodiorite (378.7 ...

The texture and morphology of igneous zircon indicates magmatic conditions during crystallization can be used to constrain provenance. Zircons from porphyry copper deposits are typically prismatic, euhedral, strongly oscillatory zoned which may differentiate them zircons associated with unmineralized systems. Here, cathodoluminescence images the Quellaveco district, Southern Peru, were collecte...