Generalization of the results study placer gold and mechanisms its distribution in east Siberian Platform made it possible for first time to reveal that ore sources gold-bearing placers were mainly mineralization gold-sulfide formation formed under influence hydrothermal metasomatic processes occurred deep fault zones. It is determined hydrothermal-metasomatic formations rock are amagmatic, nea...

the area is located 20 km northwest of kashmar and about 4 km of kalateh taimour in khorasan razavi province. the study area is part of tertiary volcanic-plutonic belt north of daruneh fault and its situation in tectonic inliers between two important active faults, doruneh and taknar. volcanic rocks are mainly intermediate to acid pyroclastic type. they formed during early tertiary. the volcani...

Décollement zones within the organic-rich black shale members of the basal Marcellus Formation in New York and Pennsylvania have been recognized for some time (Nickelsen, 1986; Evans, 1994, among others). Outcrop study of the upper Onondaga Formation-Marcellus Formation contact at three localities in the central New York outcrop belt (Figure 1) demonstrates that thrust fault structures are pres...

While riparian forests have a demonstrated ability to remove nitrate (NO3-) moving from uplands before it enters streams, there is considerable uncertainty as to the mechanisms of NOr removal in these areas. We characterized spatial and temporal variation in denitrification enzyme activity (DEA), microbial biomass C and N content, soil respiration and potential net N mineralization and nitrific...

kuh-e-faryadoon and kouli kosh iron deposits are hosted by regional metamorphic rocks of sanandaj-sirjan zone around deh-bid area. plugs and domes of acid rocks protrude these metamorphic rocks. a mylonitization event is super imposed on acid rock and metamorphic complexes. field, petrological and geochemical studies have shown that (1) iron mineralization have occurred during mylonitization in...

Abstract The punctuated distribution of major gold deposits along orogenic belts is poorly understood. In northern Perú, cluster trends that transect the subparallel Phanerozoic accreted onto western margin Archean–Proterozoic Amazonian craton. This suggests influence as yet unrecognized pre-Andean basement structures in controlling localization deposits. We report newly discovered Tomac ophiol...

Kuh-E-Faryadoon and Kouli Kosh iron deposits are hosted by regional metamorphic rocks of Sanandaj-Sirjan zone around Deh-Bid area. Plugs and domes of acid rocks protrude these metamorphic rocks. A mylonitization event is super imposed on acid rock and metamorphic complexes. Field, petrological and geochemical studies have shown that (1) Iron mineralization have occurred during mylonitization in...