Introduction: Many new meteorites representing rare achondrite groups are being recovered from both hot and cold deserts. A significant fraction of these meteorites are both coarse-grained in texture and small in size, making accurate determinations of bulk rock compositions rather challenging. We successfully obtained elemental analyses of several angrites using ~1 mm 2 rasters of polished sec...

The Sanak-Baranof plutonic belt (SBPB) includes a series of biotite tonalite, granodiorite, and granite neartrench plutons that intrude the Campanian to Eocene flysch of the Chugach-Prince William terrane (CPW) for 2100 km along the southern Alaskan margin (Hudson et al., 1979; Hill et al., 1981; Bradley et al., 2003; Haeussler et al., 2003). SBPB intrusions have been interpreted to be the resu...

The purpose of this study is to determine the geometry and timing of movement on internal and bounding structures of the Bridge River terrane in the vicinity of one segment of the 1988 LITHOPROBE southern Cordilleran transect, near Lilloo&, British Columbia (Figure l-12-1). Specifically, the orientation of the major faults (Yalakom, Marshall Creek and others) is addressed in order to assist in ...

[1] One process for the formation of continental crust is the accretion of arc terranes at continental margins. A longstanding problem with this model is that although the composition of the continental crust is andesitic, the majority of arc lavas are basaltic. Moreover, those arc lavas that are andesitic tend to be evolved (lower Mg #) compared to the continental crust. Continental crust can ...

This article discusses the geochemical and petrological evolution of São José do Campestre granite complex (SJCgr), last Neoarchean plutonic event so far described in massif NE Brazil. We report field, petrographic, zircon U-Pb dating, whole rock mineral chemistry for representative SJCgr samples. Laser ablation data indicate that emplacement took place at 2664 ± 13 Ma. The rocks comprising hav...

Jiama is a super-large porphyry copper–polymetallic deposit located in the Gangdese metallogenic belt of southern Tibet. The consists combination polymetallic skarn, Cu–Mo mineralization at contact between Porphyry and hornfels, distal Au fault. current metal reserves are 7.4 Mt Cu, 0.6 Mo, 1.8 Pb–Zn, 6.65 Moz Au, 360.32 Ag, with skarn to porphyry–hornfels host-rock ratio ~3:1. Based on detaile...