Samarium-Neodymium Isotope and Trace-Element Analysis of Metavolcanic Rocks from the Vicinity of Fort Bragg, North Carolina: A Pilot Study of Artifact Source Quarry Discrimination

Research Design: A Pilot Study for Identifying Raw Material Source Areas for Prehistoric Artifacts from Fort Bragg, North Carolina

As outlined in the scope of work, the goal of this investigation is to characterize the compositional variation in the metavolcanic rocks and the ceramic clays that would have been used by the prehistoric inhabitants of the Fort Bragg vicinity. This goal will be achieved by examining the chemical and mineralogical composition of 50 rock samples from various quarries in central North Carolina, a...

Neutron Activation Analysis of Woodland Period Pottery from the Vicinity of Fort Bragg, North Carolina

Origin of the sudbury complex by meteoritic impact: neodymium isotopic evidence.

Samarium-neodymium isotopic data on whole rocks and minerals of the Sudbury Complex in Canada gave an igneous crystallization age of 1840 +/- 21 x 10(6) years. The initial epsilon neodymium values for 15 whole rocks are similar to those for average upper continental crust, falling on the crustal trend of neodymium isotopic evolution as defined by shales. The rare earth element concentration pat...

Rb–Sr and Sm–Nd isotope systematics and geochemical studies on metavolcanic rocks from Peddavura greenstone belt: Evidence for presence of Mesoarchean continental crust in easternmost part of Dharwar Craton, India

Linear, north–south trending Peddavura greenstone belt occurs in easternmost part of the Dharwar Craton. It consists of pillowed basalts, basaltic andesites, andesites (BBA) and rhyolites interlayered with ferruginous chert that were formed under submarine condition. Rhyolites were divided into typeI and II based on their REE abundances and HREE fractionation. Rb–Sr and Sm–Nd isotope studies we...

توزیع عناصر کمیاب و خاکی نادر در میان فازهای دگرگونی و کلینوپیروکسن‌های باقیمانده در اپیدوت- آمفیبولیت‌های شمال ارومیه- شمال‌غرب ایران

Rare earth and trace element concentrations of mineral assemblages including amphibole, plagioclase, epidote group minerals (zoisite and clinozoisite) and relict clinopyroxenes from parental rock of epidote amphibolite from north of Urumia were obtained in situ by LA-ICP-MS analysis. The obtained data were used to study distribution of trace elements among metamorphic phases and relict clinopyr...