scholarly journals Gold metallogenic zoning and mineralized prospect in Dalat zone

2013 ◽  
Vol 16 (2) ◽  
pp. 85-96
Author(s):  
Hoang Kim Nguyen
Keyword(s):  
Gold Mineralization ◽  
Mineral Exploration ◽  
Tectonic Setting ◽  
Sedimentary Rocks ◽  
Mineral Deposits ◽  
Late Mesozoic ◽  
Main Factors ◽  
Gold Mineral ◽  
Granitoid Intrusions ◽  
Dalat Zone

Dalat structural zone was had formed in tectonic setting of continental margin arc in late Mesozoic, have given structural and metallogenic zoning. In this Dalat structural zone, gold is one of the few endogenous minerals is significant mineralization in the study and search - exploration. Endogenic gold distribution in Dalat zone are controlled by main factors such as: structure – locally tectonics (structural fold, brittle fault, structure of dome top of granitoid intrusions, tectonic setting), intrusion (related to gold mineralization), stratigraphy-lithology (environmental containments: volcanic, igneous, terrigenous sedimentary rocks, dykes). Based on analysis of factors of ore control, 138 gold mineral deposits, mineral occurrences and mineralized occurrences, and research several characteristic gold mineral doposits, and mineral occurrences, conducting gold metallogenic zoning, and evaluating the potential of these gold ore regions. These results mean a lot to innovated to next gold prospecting - mineral exploration.

scholarly journals GOLD MINERALIZATOIN FEATURES OF SUOILINH - SONGMADA (LINH SPRING - MADA RIVER) AREA AND ITS PROSPECTS

2009 ◽  
Vol 12 (10) ◽  
pp. 103-118
Author(s):  
Hoang Kim Nguyen
Keyword(s):  
Gold Mineralization ◽  
Active Continental Margin ◽  
Sulfide Mineral ◽  
Medium Temperature ◽  
Late Mesozoic ◽  
Magmatic Arc ◽  
Mineral Associations ◽  
Deposit Type ◽  
Dalat Zone ◽  
Host Rocks

Suoilinh-Songmada area is situated in Vinhan ore region, in the SW of Dalat zone. Gold mineralization in this region occurred mainly in granitoid of Dinhquan complex, some of them are found in terrigenous-carbonate sedimentary rocks of formations: Dakrong and Mada. The host rocks were strongly altered mainly by sericitization, quartization, chloritization, and epidotization. The ores deposits were formed in veins, zones of veins that their direction is different: mainly in NE-SW, and NW-SE; secondary in sub longitude and sub-latitude. They are related to main fault in NW-SE direction. The mineral associations are mainly presented by pyrite, arsenopyrite, galena, sphalerite, chalcopyrite, native gold, and electrum, occupying 10-20%. The gold mineralization genesis is low-medium temperature hydrothermal, (125-267ºC) related to calc-alkaline granitoid which was formed in magmatic arc of active continental margin of ancient East Asia type, developed in Late Mesozoic. The ore deposit type is vein-shaped gold-quartz-sulfide; mineral types are: gold quart-pyrite-arsenopyrite and gold-quartz-polymetallic sulfide. With the above-mentioned features of spatial distribution and mineralization, gold mineralization of the Suoilinh Songmada area has high potential which should be studied more.

Late Mesozoic—Cenozoic clay mineral successions of southern Iran and their palaeoclimatic implications

Clay Minerals ◽  
2005 ◽  
Vol 40 (2) ◽  
pp. 191-203 ◽  
Author(s):  
F. Khormali ◽  
A. Abtahi ◽  
H. R. Owliaie
Keyword(s):  
Electron Microscopy ◽  
Upper Cretaceous ◽  
Sedimentary Rocks ◽  
X Ray Diffraction ◽  
Humid Climate ◽  
X Ray ◽  
Late Mesozoic ◽  
Southern Iran ◽  
Transmission Electron

AbstractClay minerals of calcareous sedimentary rocks of southern Iran, part of the old Tethys area, were investigated in order to determine their origin and distribution, and to reconstruct the palaeoclimate of the area. Chemical analysis, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and thin-section studies were performed on the 16 major sedimentary rocks of the Fars and Kuhgiluyeh Boyerahmad Provinces.Kaolinite, smectite, chlorite, illite, palygorskite and illite-smectite interstratified minerals were detected in the rocks studied. The results revealed that detrital input is possibly the main source of kaolinite, smectite, chlorite and illite, whilein situneoformation during the Tertiary shallow saline and alkaline environment could be the dominant cause of palygorskite occurrences in the sedimentary rocks.The presence of a large amount of kaolinite in the Lower Cretaceous sediments and the absence or rare occurrence of chlorite, smectite, palygorskite and illite are in accordance with the warm and humid climate of that period. Smaller amounts of kaolinite and the occurrence of smectite in Upper Cretaceous sediments indicate the gradual shift from warm and humid to more seasonal climate. The occurrence of palygorskite and smectite and the disappearance of kaolinite in the late Palaeocene sediments indicate the increase in aridity which has probably continued to the present time.

Origin of quartzofeldspathic gneisses at Montauban-les-Mines, Quebec

1984 ◽  
Vol 21 (3) ◽  
pp. 336-345 ◽  
Author(s):  
M. K. Prabhu ◽  
G. R. Webber
Keyword(s):  
Discriminant Function ◽  
Mineral Deposits ◽  
Normative Quartz ◽  
Gold Mineral

Quartzofeldspathic gneisses near zinc–lead–gold mineral deposits at Montauban-les-Mines, Quebec, have been examined geochemically to determine whether their protoliths were dominantly sedimentary or igneous. The gneisses are generally similar in average compositions to both rhyolitic rocks and sandstones (greywackes in particular). The most useful methods of protolith discrimination were found to be: (1) log (SiO2/Al2O3) versus log [(CaO + Na2O)/K2O]; (2) Niggli si versus mg; (3) normative quartz; (4) Shaw's discriminant function. Application of these criteria indicates that the Montauban quartzo-feldspathic gneisses were derived dominantly from quartzose sandstone or greywacke protoliths (or both).

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