The content of Al2O3, K2O, Na2O and H3O+ in auriferous quartz is increasing with the depth of ore body, so it can be used for in dicating the buried depth of ore body, so it can be used for indicating the buried depth of ore body.
On the basis of the calculation of the gains and losses of major and minor elements in various altered diopsidites, SiO 2,Ca,Al 2O 3,Na 2O,CO,Cr and Pb are obviously depleted in various types of altered diopsidites, and are remarkably concentrated in mineralized altered rock and auriferous quartz veinlets;
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.
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.
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.
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.
Quartz from gold-bearing quartz veins of the Mayum gold deposit in the Ngari area, Tibet, was dated by using the 40Ar/39A fast-neutron activation technique, which gave a plateau age of 44.08±0.39 Ma and an isochron age of 44.10±0.20 Ma. The plateau age represents the age of quartz formation.
Auriferous quartz veins in the Bankuan gold deposit occur in the interlayer broken zone of the basal conglomerate of the Tietonggou Formation or at the unconformity between the Tietonggou Formation and the crystalline basement.
Auriferous quartz veins from the Dongping gold deposit, NW Hebei Province and Metallogenesis-Fluid inclusion Rb-Sr isochron evid
The Dongping gold deposit, situated on the northern margin of the North China Platform, is a composite deposit composed of auriferous quartz vein-type and altered rock-type ore bodies.
When brittle structures were formed locally in the ductile shear zone, the ore-forming fluids migrated to the structures along microfractures, and preciptated auriferous quartz because of reduction of pressure and temperature.
The extremely altered syenite enveloping auriferous quartz vein shows positive Ce anomaly and larger LREE/HREE ratio than that of the unaltered syenite.
The origin of Kibaran (late Mid-Proterozoic) tin, tungsten and gold quartz vein deposits in Central Africa: a fluid inclusions s
Fluids forming gold quartz veins and breccias are different from the first, especially by showing characteristics of a high-pressure environment.
The Falun gold quartz vein mineralization is located ca 230 km NW of Stockholm, Sweden, within the Early Proterozoic volcano-sedimentary sequence of Bergslagen.
Thrust-controlled, gold quartz-vein mineralisation at the Tom's Gully mine, Northern Territory, Australia
Arsenic, however, has a positive correlation with gold, and the two generations of arsenopyrite identified in the gold quartz veins are consistent with different mineralizing events, which gave rise to different gold grades.
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.