Origin of the Nizhny Tagil Clinopyroxenite–Dunite Massif, Uralian Platinum Belt, Russia: Insights from PGE and Os Isotope Systematics

the role of russia in transmission of energy from central asia and caucuses to european union

پس ازفروپاشی شوروی،رشد منابع نفت و گاز، آسیای میانه و قفقاز را در یک بازی ژئوپلتیکی انرژی قرار داده است. با در نظر گرفتن این منابع هیدروکربنی، این منطقه به یک میدانجنگ و رقابت تجاری برای بازی های ژئوپلتیکی قدرت های بزرگ جهانی تبدیل شده است. روسیه منطقه را به عنوان حیات خلوت خود تلقی نموده و علاقمند به حفظ حضورش می باشد تا همانند گذشته گاز طبیعی را به وسیله خط لوله مرکزی دریافت و به عنوان یک واس...

The Origin of Platinum Group Minerals from the Freetown Intrusion, Sierra Leone, Inferred from Osmium Isotope Systematics

The origin of certain alluvial platinum-group mineral (PGM) grains is controversial, with two major proposed models. One involves primary formation within ultramafic intrusions, followed by weathering into laterites with no further alteration prior to alluvial concentration. The other involves in addition, solution of the platinum-group elements (PGE) during weathering of the ultramafic source ...

New insights into the origin of O–Hf–Os isotope signatures in arc lavas from Tonga–Kermadec

a GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney NSW 2109, Australia b School of Geography, Environment and Earth Sciences, Victoria University of Wellington, PO Box 600, New Zealand c Department of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403, USA d Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technolo...

Re-Os Abundance and Isotope Systematics of Al-undepleted Komatiites in the Kidd-Munro Assemblage: Results From Dundonald Beach, Abitibi Greenstone Belt, Canada

Re-Os isotopic systematics and platinum group element composition of the Tagish Lake carbonaceous chondrite

The Tagish Lake meteorite is a primitive C2 chondrite that has undergone aqueous alteration shortly after formation of its parent body. Previous work indicates that if this type of material was part of a late veneer during terrestrial planetary accretion, it could provide a link between atmophile elements such as H, C, N and noble gases, and highly siderophile element replenishment in the bulk ...