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1994 Vol.3 Issue.4,Published 1994-12-31
241 METALLOGENETIC AND GEOLOGICAL FEATURES OF WUFENG-WUXINGSHAN GOLD DEPOSIT IN JILIN PROVINCE
Feng Shouzhong
Wufeng-Wuxingshan gold deposit which occured in Mesozoic continental volcanic rock was a type of epi-hydrothermal deposit. The volcanic rock of Jingouling formation of Upper Jurassic system is the main source bed.Ore bodies are controlled by the ring and radiating fissures of the volcanic mechanism,the inner and outer contact zones of subvolcanic veins. Alkali-feldspar granite which intruded into the basal position of Jingouling formation provided the main thermal source for gold deposit Metallogenesis had mainly operated under low pressure-temperature, neutsal medium,weak oxidizing and ultra-stipergenesis conditions, Gold and silver relatively enriched in the following parts:that is①the upper part of the body;②the turning corner expanding part and the convergence of branchings of the ore vein;③strongly sericitized and adularized aItered rock;④containing fine-grained pyrite calciteqtiartz veins;⑤the concentric part of argentite.
1994 Vol. 3 (4): 241-247 [Abstract] ( 30 ) [HTML 1KB] [ PDF 552KB] ( 188 )
248 A STUDY ON THE INCLUUION OF MINERALS IN THE ANJIACHA GOLD DEPOSIT,GANSU PKOVINCE
Tan Liqun
The Anjiacha gold deposit is located in Xihe county,Gansu province,On the basis of the analytical data for inclusion composition in minerals and the measuring results of the homogenization temperatures for the inclusion in quartz,we have calculated the metallogenetic pressure for the deposit, the physico-chemical parameters of the ore-forming fluid and its characterastic ratios of the chemical composition etc,And then we discussed some problems about the gold mineralization together with local-geological features still further. These problems are(1)the variation regularity of the metallogenetic temperatures and some other physico-chemical parameters in different ore-forming stages of the gold mineralization;(2)the nature and source of the mineralizing solution;(3)the direction of flow for the hydrothermal mineralizing solution;(4) the migration-pricipitation of the gold in the hydrothermal fluid;and(5)the relationship between the gold mineralization with the chemical composition of the hydrothermal fluid etc. The results show that the Anjiacha gold deposit possess the genetic characteristic of the reworked strata-bound gold deposit.
1994 Vol. 3 (4): 248-261 [Abstract] ( 25 ) [HTML 1KB] [ PDF 974KB] ( 205 )
262 THRUST NAPPE STRUCTURE AND GOLD MINERALIZATION IN BAILONG JIANG AREA
Li Yadong
The thrust nappe structure system in the Beilongjiang area is composed of six basic structural units,i.e. Yaerma-Zhouqu thrust zone, Pohai-Baiyi-Wuping thrust zone, Xiqing mountin-south of Wuping nappe zone,Maqu-Nanping thrust zone,tensional basin in the northern foot of Guanggei mountin and Gahai-Langmusi basin。The thrusting restilts from muItiple subductions of ocean crust of Tethys and Indian plate beneath Sino-Korean plate since Hercinian-Indosinian, which produce the Hercinian-Indosinian folded belt in the margin of continent crust(south Qinling) and southward imbricate thrust nappe structures.It is formed that magmatic zones and gold mineralization zones migrate southwards in time and genetic type, including, in order,Qingkeyan-Yaerma-Zhouqu Indosinian hypabyssal calc-alkali magmatic zone and Yanshanian mid-epithermal fine disseminated As-Au mineralization zone, Pohai-Laerma-Baiyi early Yanshanian calc-alkali stiperhypabyssal subvolcanic and magmatic zone and early Hymalayan mid-epithermal hotwater cryptoexplosion-type fine disseminated gold mineralization zone,Maqu-Nanping latest Yanshanian magmaticzone and mid-late Hymalayan mid-epithermal hydrothermal and hot-spring-type gold mineralization zone.
1994 Vol. 3 (4): 262-269 [Abstract] ( 42 ) [HTML 1KB] [ PDF 612KB] ( 199 )
270 METALLOGENIC CHARACTERS AND PROSPE CTING DIRECTIONS OF SILVER DEPOSITS IN YUNKAI AREA
Jia Weiguang
The subduction of Pacific plate and Indian plate caused fierce magma actities and volcanic-subvolcanic activities in the Yunkai area of south Yangtze plate fringe in Mesozoicera. The activities induced a series of gold and silver metallogenic belt in Chian. There are 10 silver deposits which are over mesoscopic silver deposits in this belt. This paper will discuss the relation between silver mineralization and geotectonic cireumstance, hOst strata, magma evloution.
1994 Vol. 3 (4): 270-277 [Abstract] ( 28 ) [HTML 1KB] [ PDF 643KB] ( 218 )
278 THE GEOLOGICAL AND GEOCHEMICAL FEATURES OF GAOLONG GOLD DEPOSIT AND THEIR SIGNIFICANCE IN GOLD SEARCHING
Li Cunyou
Gaolong gold deposit is a typical impregnation gold deposit in northwestern GuangXi. In order to search GaoLong type gold deposit in this area, this paper studied the geological and geochemical diaracte-ristics of Gaolong gold deposit and came to this conclusion:the ring fault around the GaoLong swell is the gold minerogenetic control fault; some of metallo-genitic element came from the wall-rock (Trias arenaceous-pelitic rock and Permian System carbonatite);the gold hydrothermal is the circulation subsurface vvater that is made from rain (include karst water)and magmatic water; the minerogenetic environment was open and GaoLong gold deposit is hypogene circulation subsurface water infiItration type in genesis. Finally,this paper summarized the geological and geochemicel symbols in gold searching.
1994 Vol. 3 (4): 278-288 [Abstract] ( 22 ) [HTML 1KB] [ PDF 816KB] ( 240 )
289 THE TYPOMORPHIC CHARACTERS OF THE SUPER MICROGRAINED IMPREGNATION-TYPE GOLD DEPOSITS IN NORTHWESTERN GUANGXI
Guo Jiahui
This paper briefly sets out the type and ore-genetic typomorphic characteristics of the super micrograined impregnation-type gold deposits in Northwestern Guangxi,which consist of the way and times of the hydrothermal activity and alteration,the shape and occurrence and thickness of orebody and the gold tenor change of ore,petrology and fabric and mineral constitution and chemical composition of ore, and the gold exitence etc. At the same time, it also introduces the prospecting typomorphic characteristics,which are regarded as basise of seeking and apprasing the gold deposits, such as silification, pyritization,arsenopyritization, and carbotization——the typomorphic association of mineral,arsenopyrite——the typomorphic mineral, and various typomorphic characteristics of the quartz, pyrite, arsenopyrite, andstibnite.
1994 Vol. 3 (4): 289-292 [Abstract] ( 25 ) [HTML 1KB] [ PDF 397KB] ( 165 )
293 STUDY ON ORE-CONTROLLING ACTION OF GOLD DEPOSITS AND GEOCHEMISTRY OF STABLE ISOTOPE IN THE EAST AREA OF GUANGXI ZHUANG AUTONOMOUS REGION
Liu Tengfei
The gold deposits in this region occured in sandshale of Cambrian epimetamorphic rock series of Shuikou Group.Mineralization can be mainly classified into two types:altered rock type and quartz-vein type. Ore bodies were controlled by two groups of brittle-ductile shear zones trending nearly to east-west and northeast.Sulfur isotopic constitution indicates that sulfur source mainly came fromanatectic syntexis magmatic hytrothermal solution,partly from strata。Hydrogen and oxygen isotopic compositions reflects that the ore-forming solution is mostly magmatic water,mixed with a few of metamorphic and meteorological water.Lead isotopic constitution indicates that lead source is mostly anatectic source,mixed with a few of crustal source material. Gold deposit is characterized by multiple source mineralization. Stable isotopes of sulfur, lead,hydrogen and oxygen etc.and geological feature of ore deposit indicate that the gotd deposit in this district is characterized bymultiple source, multiple origin and multiple stage of mineralization. Ore deposiy origin includs magmatic hydrothermal,metamorphic hydrothermal composite surperimposition,the latter is the principal.
1994 Vol. 3 (4): 293-305 [Abstract] ( 28 ) [HTML 1KB] [ PDF 925KB] ( 192 )
306 THE EVOLUTION OF NATIVE GOLD COMPOSITION DURING THE FORMATON OF OXIDIZED ZONE IN SINIUKHIN COPPER-GOLD DEPOSIT,ALTAI
N. V. Rosliakova, L. N. Pospelova, V. B. Marshuk
The skarn type of copper-gold deposit occured in the contact zone of Salakoukeshen granitoid complex and Lower Cambrian Series volcanic sedimentary rock. Hydrothermal gold mineralization(360-130℃)mostly superimposed on skarn rock(400℃).Gold mineralization mostly distributed in garnet-wollastonite skarn rock.Oxidation resulted enrichment of secondary sulphide and the reducing of native gold,the reason for the latter was that the gold is more active than silver.At the same time,part of silver seperated out from native gold during oxidation,so the fractional percentage points of gold is similar to native gold in endogenetic ore;Because of the fractional percentage points of native gold in oxidized zone has widly discretation, we should pay more attention to it in evaluating deep seated ore.
1994 Vol. 3 (4): 306-311 [Abstract] ( 16 ) [HTML 1KB] [ PDF 525KB] ( 157 )
312
1994 Vol. 3 (4): 312-316 [Abstract] ( 18 ) [HTML 1KB] [ PDF 461KB] ( 154 )
317
1994 Vol. 3 (4): 317-319 [Abstract] ( 14 ) [HTML 1KB] [ PDF 323KB] ( 162 )
320
1994 Vol. 3 (4): 320-320,311 [Abstract] ( 13 ) [HTML 1KB] [ PDF 210KB] ( 189 )
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