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The inclusions of Huanggangliang quartz crystal in Inner Mongolia were observed and tested by microscope, electron probe, laser Raman spectrometer, hot and cold stage, etc. The genesis of the crystal was preliminarily discussed. There are two types of quartz crystals: green and smokey crystal. The growth annulus in the crystal is obvious. The core of the crystal is relatively clean, with only sporadic gas-liquid two-phase inclusions. A large number of acicular ferroactinolite inclusions are scattered in the outer ring of the green crystal, and another number of gas-liquid inclusions rich in CO2 and N2 can be seen in the middle and outer ring of the smokey crystal. The homogenization temperatures of the green crystal from the core, middle ring to outer ring are 300, 330 and 260 ℃, respectively. The salinity(w(NaCl eq ))is 0. 18%-5. 71%. The homogenization temperature of the smokey crystal from the core to the middle and outer rings is about 260 and 350 ℃, respectively, and the salinity is 18. 22%-23. 18%. The growth environment of Huanggangliang quartz crystal is complex and multi-stage. According to the change of inclusion temperature and salinity, the crystallization of smokey crystal is earlier than that of green crystal. At the initial stage, the smokey crystal grew under relatively stable mesothermal hydrothermal conditions. The intrusion of magmatic hydrothermal solution and the mixing of a small amount of atmospheric precipitation increased the temperature rise of the ore-forming fluid and immiscibility. The fluid rich in CO2 and N2 was wrapped by the growing crystal. The green crystal grew in a relatively stable high-temperature hydrothermal solution, in the early stage. The addition of atmospheric precipitation in the later stage decreased the temperature of the fluid. The acicular ferroactinolite was mixed in the fluid and wrapped by the later growing crystal. [ABSTRACT FROM AUTHOR]

Trapiche-like quartz, which is found in Huanggangliang area, Chifeng City, Inner Mongolia, China, has a short columnar euhedral shape. Arms of trapiche-like phenomena are formed by six radial dark bands located along the a-axis of crystals, and their cores are formed by color zones. Various methods were used to investigate the conventional gemological characteristics, trapiche pattern features, chemical compositions, and spectral characteristics of the trapiche-like quartz. CL images and EPMA results reveal they were formed at high temperature conditions and originated from pegmatite. The hexagonal darker zones with high FeO and very little TiO2 contents indicate the trapiche-like patterns are due to spatial distribution of color-inducing elements. According to the position and interpenetration relationship between inclusions, fibrous and spherical inclusions are identified as protogenetic inclusions, which were respectively identified to be ferro-actinolite and iron oxide by EPMA and Raman spectra.

Trapiche-like quartz, which is found in Huanggangliang area, Chifeng City, Inner Mongolia, China, has a short columnar euhedral shape. Arms of trapiche-like phenomena are formed by six radial dark bands located along the a-axis of crystals, and their cores are formed by color zones. Various methods were used to investigate the conventional gemological characteristics, trapiche pattern features, chemical compositions, and spectral characteristics of the trapiche-like quartz. CL images and EPMA results reveal they were formed at high temperature conditions and originated from pegmatite. The hexagonal darker zones with high FeO and very little TiO2 contents indicate the trapiche-like patterns are due to spatial distribution of color-inducing elements. According to the position and interpenetration relationship between inclusions, fibrous and spherical inclusions are identified as protogenetic inclusions, which were respectively identified to be ferro-actinolite and iron oxide by EPMA and Raman spectra. [ABSTRACT FROM AUTHOR]

Two kinds of inclusions, fluid-melting inclusion and gas-liquid inclusion, are present in the Huanggangliang deposit in eastern Inner Mongolia. Temperature ranges from 1050°C of fluid-melting inclusion to 150°C of liquid inclusion. Away from intrusion, the inclusions of orebodies intend to be characterized by simpler type, lower temperature and lower salinity, as well as weakened relation to intrusion. The metallization of the Huanggangliang deposit is characterized by multiple activities of ore-forming fluid, multi-source, multi-stage accumulation of ore-forming material, F-rich environment, enrichment of F, organic gas, CO2 and N2, and involving of residual magma. [ABSTRACT FROM AUTHOR]