a brief account of the representative and workable industrial minerals namely magnesite, talc and barite in lesser himalaya, is presented here emphasizing their genesis. deposits of magnesite and talc are found associated with neoproterozoic, plateform type, shelf-slope limestone-dolomite host rocks from inner lesser himalayan sequences. field, textural, geochemical signatures and fluid inclusi...

Eclogites from the Guanshan and Yangkou areas of Sulu orogen consist garnet, omphacite, phengite, amphibole, quartz/coesite, rutile, ilmenite. Garnet exhibits weak compositional zoning where Xgr decreases core to mantle then increases towards rim, coupled with an increase in Xpy decrease rim. Phase equilibria modelling pseudosections calculated using THERMOCALC NCKFMASHTO system for eclogites r...

The article considers the geological features and ore composition of Dyusembay Central (Sayakhat) leadzinc deposit in Karsakpai metallogenic complex Kazakhstan. Historically, was considered industrially significant terms iron ores, rather than lead, zinc, copper. It is shown that composed tuffaceous, silty-sandstone, carbonaceous-terrigenous (ore-hosting), terrigenous, volcanogenic rocks assign...

IMPLICATIONS FOR SHOCK METAMORPHISM AND THE EARTH’S LOWER MANTLE; A. El Goresy1, T. G. Sharp2, B. Wopenka3, and M. Chen4; 1Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany; 2Dept. of Geology, Arizona State University, Tempe, AZ 85287 USA; 3Dept. of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, USA; 4Guangzhou Institute of Geochemistry, A...

Almost all meteorites (about 99% by number) are samples from a few hundreds of asteroids that are leftover from planetesimals and protoplanets formed within several million years after the birth of the Solar System. These meteorites record detailed evolutionary history of dust to planets, including condensation, accretion, aqueous alteration, thermal metamorphism, partial and total melting.

Knowledge of metal complexes in natural hydrothermal fluids is fundamental to our understanding of ore formation as well as other processes involving interactions between aqueous solutions and solids such as metamorphism. Our present understanding of the structure of metal complexes in natural hydrothermal fluids is incomplete due to the paucity of solubility and spectroscopic studies on geolog...

During the COUIX of I :50 000 scale regional mapping in the Northern Selkirk Mountains (NTS 082M) various granitic rocks were sampled for U-Pb geochronology. This report presents new U-Pb data, interpreted ages, and the implications of these results for hvo such samples from the Selkirk Allochthon: the Downie Creek otihogneiss, and the Goldstream Pluto”. The Downie Creek orthogneiss consists of...

Introduction: Organic matter in primitive meteorites may have mostly been formed in the interstellar medium [e.g. 1-3]. After formation of the solar system these molecules have been incorporated into the parent bodies of the various primitive meteorites [2]. Subsequent aqueous alteration and thermal metamorphism have altered the initially similar set of compounds including their carbonaceous mi...