a particular feature of biotite grains from some of the canadian appalachian granitic rocks is the presence of lenses of ca-al silicates developed along cleavage planes. these from the more to less common are prehnite, pumpellyite and grandite garnet, an intermediate composition between andradite and grossular. rarely all three minerals can be observed together in one single biotite grain. micr...

A particular feature of biotite grains from some of the Canadian Appalachian granitic rocks is the presence of lenses of Ca-Al silicates developed along cleavage planes. These from the more to less common are prehnite, pumpellyite and grandite garnet, an intermediate composition between andradite and grossular. Rarely all three minerals can be observed together in one single biotite grain. Micr...

Abstract Continental-scale recycling of detrital zircon (DZ) grains and associated sediment across North American is not well understood. We trace a through line following the DZ proxy for detritus originally sourced from Grenville Appalachian orogens. This paper lays out an antecedent framework one greatest sedimentation episodes Phanerozoic: initial dispersal Appalachian- Grenville-age to wes...

Abstract Grenville-age (1.3–0.9 Ga) zircons represent one of the most ubiquitous detrital zircon (DZ) age modes on Earth. In North America, given widespread occurrence Grenville basement, DZs are commonly viewed as nondiagnostic with regard to source region in provenance studies. Systematic recovery DZ core-rim U-Pb ages makes it possible identify and differentiate previously indistinguishable ...

Abstract Suprasubduction zone (SSZ) ophiolites of the northern Appalachians (eastern North America) have provided key constraints on fundamental tectonic processes responsible for evolution Appalachian orogen. The central and southern Appalachians, which extend from New York to Alabama (USA), also contain numerous ultramafic-mafic bodies that been interpreted as ophiolite fragments; however, th...