The δ ( 30 Si) value of weak pyrite mineralize_containing gold quartz vein is -0.1‰ in metamorphic hydrothermal type deposits and the δ ( 30 Si) value of sicicification_altered rock types and first ore_forming stage of quartz veined gold deposits is -0.2‰ in telescoping genesis gold deposits.
The metallogenetic temperature ranges from 325 -335℃ and the pressre from 1080×105to 1360× 105Pa. The ore fluid is of H2O-NaCl-CO2 system. The amount of peaks of decrepitation temperature curve of the fluid inclusions is in positive corre-lation with Au content of gold quartz vein.
Three samples of gold bearing quartz vein ore were tested using ic determination by SHRIMP for Zirconium,and the results show that the U-Pb isotopic ages of Zirconium are distributed in four areas,i. e. ,1 800~2 000Ma,800~1 000Ma,400~500Ma,and 300Ma.
To study genetic relationship between these dikes and gold orebodies, we determined the homogenization temperature, composition, salinity and hydrogen oxygen isotope of H 2O of fluid inclusions in quartz of gold bearing quartz vein, REE and trace elements of gold bearing quartz vein and rock of correlative dikes and country rock are detemined.
There are mainly four types of telluride bearing gold deposits in China, namely, gold bearing quartz vein type in Archaeozoic granite greenstone terrain, altered tectonite type in Proterozoic volcanic rocks, epithermal gold silver deposits in Meso Cenozoic volcanic rocks and gold deposits related with granite.
The zircons from sulfide-rich gold-bearing quartz vein have high common Pb concentration, 0.65~2.27%, the range of Th/U ration is narrow, 0.306~0.557, and the age is 152.5±3.1Ma, belonging to the Yanshanian epoch, and representing the age of the main mineralization epoch of the Hetai gold deposit.
The ores of gold-bearing quartz vein type has been pretreated by strong alkalifor 336 hours, then the leaching rate of gold has been increased from 74. 26 percent in directcyandidation to 88. 89 percent.
On the basis of the careful study on the ore composition, typomorphic characteristics of associated minerals and wall-rock alterations of the two main types of gold mineralization (gold-bearing quartz vein and altered rock type), the basic metallogenic regularities are discussed, and the regional metallogenic model for gold in the area has been established.
n order to solve the problem of formation age of gold-bearing quartz in ZhangjiakouXuanhua district, we have adopted fast-neutron activation method to test 40Ar/39Ar ages of five typical gold deposits in the district and obtained five age data:1362.0±24.8Ma, 963.7±22.3Ma, 579.6±8.5Ma, 570.8±24.2Ma and 167.9±1.2Ma.
Lead-step leaching analyzing results show that the ratios of 206 Pb / 204 Pb , 207 Pb / 204 Pb , and 208 Pb / 204 Pb of scheelite are in narrow variety with averages of 18.11, 15.1, and 38.6, respectively, and these ratios of scheelites are similar to the corresponding ratios of the pyrite from the same gold-bearing quartz veins, of the alternated host rocks, and of the regional slates of the Banxi Group.
B. Roberts (1987) discussed ore-bearing Rieded system of fiffures (D. P. R. R' and T. P') and pointed out that the emplacement mechanism of auriferous quartz has a quite difference in different type fissures.
chronolog ical study on subvolcanic rocks and gold bearing gold veins show that both the paleovolcanic apparatus and the gold deposit were formed during the Middle Carbo niferous with the Rb Sr isochron ages of rhyolite porphyry, dacite porphyry and fluid inclusions of quartz from the gold-bearing quartz veins to be 301±21Ma, 303±26 Ma and 298±28 Ma(95% confidence), respectively.
A fluid inclusion and light element stable isotope study of the gold-bearing quartz vein system, Falun, Sweden
Along with the Haida Gold and Highgrade occurrences, the Early Bird is interpreted to be a mesothemnl gold-bearing quartz vein.
No matter which scenario occurred, there is a definite magmatic signature associated with gold-bearing quartz vein deposits.
In this article the author put forward a new type of the golden quartz vein from the point of view of structure,and expounded the important characteristics of the ore bed of this type and the major evidences for its establishment as well as its minerogenetic mechanism.
The stratabound gold-bearing quartz vein ore deposits in South China possess the characteristics of polygenetic compound ore deposits.This paper deals with the ore formation and minerogenetic model of the gold-bearing quartz veins of the Caledonian regional metamorphic minerogenetic province in eastern Guangxi-Western Guangdong and the upwarping region of the are structure of Xue Feng Movement in eastern Guizhou-Southern Anhui. They display a striking similarity.
Many gold-bearing quartz veins occur in Xiao Qinling Mountain area. 92.88% of the gold reserve in these veins is concentrated in pyrite. The fine grained cataclastic pyrite with well-developed octahedral and pyritohedral crystals contains more gold than the other pyrite varieties.The colour, typomorphic elements and other typomorphic characteristics of pyrite can be used as effective prospecting indicators of gold-bearing quartz veins.