Gold in Accessory Zircon (the Kozhim Massif, Subpolar Urals)

World Multidisciplinary Earth Sciences Symposium 2017

Denisova, Yuliya^1 ; Pystin, Aleksandr^1

Institute of Geology of the Komi Science Center, Ural Branch, Russian Academy of Sciences, Pervomayskaya 54, Syktyvkar, Russia^1

关键词: Mineral inclusions;    Prismatic crystals;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/3/032025/pdf
DOI  :  10.1088/1755-1315/95/3/032025

来源: IOP

【 摘 要 】

The crystals of zircon due to their resistance to external impact of various processes can reveal information about the environment of their formation and the inclusions observed of them. Zircon contains different mineral inclusions: biotite, plagioclase, quartz, apatite, etc. However, there is no information about gold inclusions in the zircons from granites of the Sudpolar Urals. The study results of the inclusions of gold in accessory zircon of the Kozhim granitic massif are presented in this paper. The studied mineral is a dark-brown translucent short-prismatic crystal containing the inclusion of gold and the allocations of quartz. According to studies, the inclusion of gold formed during the growth of zircon and it is the gold covered with a thin film of oxide gold. It was confirmed that the crystallization of the studied zircon occurred at a temperature of 800°C and above on the stage of formation of granites of Kozhim massif. The assumption is made about the additional temperature in the course of which was caused by decreasing of temperature up to 700° C and below during postmagmatic stage.