Hydrothermal noble opal: Structure and genesis

Autor:	E. A. Chusovitin, A. V. Barkar, P. P. Safronov, S. V. Vysotsky, V. G. Kuryavy, A. A. Karabtsov
Rok vydání:	2010
Předmět:	Nanostructure Chalcedony Annealing (metallurgy) Thermal effect Mineralogy Nanoparticle Geology engineering.material Hydrothermal circulation Iridescence Chemical engineering Geochemistry and Petrology engineering Economic Geology Thin film
Zdroj:	Geology of Ore Deposits. 52:815-820
ISSN:	1555-6476 1075-7015
DOI:	10.1134/s1075701510080131
Popis:	The results of the study of hydrothermal noble opal are discussed. it has been established that hydrothermal opal differs in its nanostructure and formation conditions from exogenic noble opal. The former is composed of smaller globules without any structuring of closely packed nanoparticles characteristic of exogenic opal. In the course of formation, hydrothermal opal is affected by pneumatolytic annealing related to the effect of high-temperature vapors under an elevated pressure. At the same time, the thermal effect results in the formation of two-dimensional photon zones in the chaotic opal matrix. These photon zones are produced by grids, the cells of which arose from a thermal effect similar to what related to Benard cells. Precisely, these structured blocks and thin films lead to spectral dispersion of light and appearance of iridescence.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7c49e43ac1fb5fc0e6e96fd5396de295 https://doi.org/10.1134/s1075701510080131 Zobrazit plný text záznamu Full text from SpringerLink