نتایج جستجو برای: amphibole group
تعداد نتایج: 980164 فیلتر نتایج به سال:
This study involved the development and application of a protocol using transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), selected area electron diffraction (SAED), and field emission scanning electron microscopy (FESEM) techniques for the particle-byparticle characterization (i.e., chemistry, crystallography, and morphology) of mixed mineral dust. This protoco...
Asbestos is a generic term for a group of six naturally-occurring, fibrous silicate minerals that have been widely used in commercial products. These minerals are more commonly found in nonfibrous forms that are not asbestos. Asbestos minerals fall into two groups or classes, serpentine asbestos and amphibole asbestos. Chrysotile, a serpentine asbestos, possesses relatively long and flexible cr...
Introduction: Over the past year, tremoliteasbestos and vermiculite mining in Libby, Montana have gone from obscurity to the forefront of the national media. The Seattle Post-Intelligencer “broke” the story in November 1999 about the world’s largest vermiculite mine and the problems associated with its asbestos exposure. As the stories point out, several hundred miners, their families, and non-...
Arc magmas are distinguished from those of other tectonic settings by several first order characteristics; 1) they tend to be realtively differentiated with even the most mafic rocks in a suite typically ≥50% SiO2, 2) they typically contain high H2O contents and 3) they have distinctive trace element signatures. The “standard” model for arc petrogenesis involves melting of a mantle wedge, preco...
This paper aims to examine the process through which a total ban on asbestos was achieved in Japan. We reconstructed the process, analyzed the roles of involved parties/events, and drew lessons from the Japanese experience of achieving the ban. In Japan, a bill to phase out asbestos was proposed in 1992 but rejected without deliberation. Wide support for such a ban subsequently grew, however, l...
The studied bodies are located in the west of Urumieyeh Lake and northeast of Oshnavieyeh, in the Sanandaj-Sirjan structural zone. Compositionaly, these bodies are formed from gabbro-diorite (Dourbeh) and granite (Nari). Gabbrodiorite rocks are composed of plagioclase (andesine to bytownite), amphibole (calcic group and magnesio-hornblende-tschermakite-hornblende type) and pyroxene (augite) as ...
All samples of Shanderman eclogites contain amphibole. Epidote group minerals and chlorite formed during retrograde phases of metamorphism. Amphiboles show zoning with high FeO and Al2O3 content at the rims and high MgO in the cores in some samples. In these samples, the amphibole compositions vary from tremolitic hornblende to tschermakite and edenitic hornblende from core to rim, respectively...
کمپلکس دگرگونی خواجو در جنوب شرق زون سنندج-سیرجان و کمپلکس دگرگونی سورسات در شمال غرب زون سنندج-سیرجان برونزد دارند. در این کمپلکسها کانی آمفیبول در سنگهای دگرگونی مانند گارنت آمفیبولیتها و آمفیبول شیستها حضور دارد. انواع فابریک آمفیبولها در این سنگها شامل نماتوبلاستی، برشی، کاتاکلاستی، رشد تجمعی و پاپیونی با طویل شدگی در امتداد محور c میباشند. حالتهای تجمعی و پاپیونی کانی آمفیبول، در ا...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید