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1994 Vol.3 Issue.3,Published 1994-09-30
161 THE METALLOGENIC EPOCH OF GOLD DEPOSITS IN CHINA
Wang Yiwen
The mineralizing ages of some typical gold deposits were discussed in Jiapigou,Liaoning, Eastern Hebei Zhangjiakou,Xiaoqinling,Jiaodong,Western Hunan,Western Guangdong-Hainan, Western Yunnan, Northern Xinjiang and Taiwan gold ore concentrated fields and so on. On the basis of this,the features of distributions,types and genesis of gold deopsits at various geologic periods were summarized. During the evolutionory history of gold mineralization,Late-Archeozoic or Early-Proterozoic Era and Mesozoic-Cenozoic Era are the two most important periods,the former is characterized by the greenstone formation type of gold deposits, but the latter is characterized by granite formation type of gold deposits. The most striking features of gold deposits in China are older ages of source of metallogenic material and younger fixed ages of deposits, that is, gold mineralization shows the distinct inherirance.
1994 Vol. 3 (3): 161-168 [Abstract] ( 36 ) [HTML 1KB] [ PDF 751KB] ( 180 )
169 THE MECHANISM OF MINERALIZATION IN CHONGLI-CHICHENG GOLD-BEARING SHEAR BELT,NORTHWEST OF HEBEI PROVINCE
Li Hongyang, Peng Lan, Wang Guofu
The unique gold-bearing shear belt is well developed in Northwest Hebei.The intensive ductile shearing deformation and complicated alkali metasomatism are well developed during Indosinian-Yanshanian period.The mylonites and alkali metasomatic complex as well as different gold deposits are the terminal evolution result of the shearing deformation and alkali metasomatism, The high Au element background in the greenstone and the intensive ductile shearing deformation as well as the evolution are the basis of gold concentration,the multiple dimensional-fracture type alkali metasomatism of gold-bearing and alkali-riched hydrothermal fluid which was associated with the deformation evolution from ductile to brittle is the key processes for ore-forming.
1994 Vol. 3 (3): 169-175 [Abstract] ( 31 ) [HTML 1KB] [ PDF 606KB] ( 151 )
176 STUDY ON THE TYPES OF GOLD DEPOSITS IN THE NORTHWESTERN HEBEI PROVINCE
Yin Jianzhao
Although the gold deposits in the gold metallogenic province of northwestern Hebei province have the same source bed,the main ore-controlling conditions and the geochemical characteristics among them are different.These differences determine that there are three basic types of gold deposits existing:Xiao-yingpan type, Zhang-quanzhuang type and Dongping type. All of these types are multi-genesis gold deposits.
1994 Vol. 3 (3): 176-185 [Abstract] ( 27 ) [HTML 1KB] [ PDF 796KB] ( 157 )
186 GEOCHEMICAL CHARACTERISTICS AND ORE SOURCE OF JINCHANGYU GOLD DEPOSIT
Liu Shaobo, Liu Liandeng
On the basis of gold analyses of 1080 samples in Jinchangyu district, gold abundance of differnt rocks was counted. The result shows that the gold abundance is similar to that of crust.S,Pb,C,O isotopes of ores are consistant with those of vein rocks and granite,but different from countryrock-amphibolite. Factor analysis of REE shows that ore,vein rocks and granite are correlated. Compared with other magmatic hydrothermal gold deposits, Jinchangyu gold deposit has magmatic element association. According to the proves above,it can be concluded that gold of the deposit is derived from the magma which has the same origin as the granite.
1994 Vol. 3 (3): 186-193 [Abstract] ( 42 ) [HTML 1KB] [ PDF 610KB] ( 150 )
194 THE CONTROL MINERALIZATION CONDITIONS OF THE XINDIAN GOLD DEPOSIT
Pang Qingbang, Ma Qibo, Shao Jun, Wang Konghai
The gold mineralization of Xindian gold deposit are very distinctly controlled by structure activities. Gaixian formation of Liaohe group offered the base of mineralised material for the gold deposit. Following metamorphism caused by motive force of the metamorphised rocks of Gaixian formation,the material in rocks occurred differentiation and formed silicified quartz veins. In this process,the mineralization material are firstly migrated and riched. Afterly,the metamorphised rocks are metasomated and resoulted,and formed porphyroid biotite-granite. In the post-magmatic hydrothermal, a great quantity mineralization material are riched. The hydrothermal riched mineral filled shear structure and formed a large number veins or bodies,The stage of shearing contrast with the stage of mineralization. Shear structure is a factor controlled veins and sites and shape of the bodies.
1994 Vol. 3 (3): 194-200 [Abstract] ( 30 ) [HTML 1KB] [ PDF 527KB] ( 182 )
201 ISOTOPIC COMPOSITIONS AND THEIR GEOLOGICAL SIONIFICANCE OF JINGQINGDING AND DENGGEZHUANG GOLD DEPOSITS.JIAODONG
Ying Hanlong
This paper has studied the isotopic compositions of oxygen and silica in altered system, the sulfur in sulphur minerals and the carbon,rubidium,samarium and neodymium in calaite of Jingqingding-Denggezhuang gold deposits,The results indicated that water in early mineralized hydrothermal fluid is non-meteroic mainly, meteroic water increases in late mineralization stage,mineralizing materials is derived from the crust.It's deduced that K-and Na-riched fluid by large scale and low-degree melting of the crust rework rock and leacheed mineralizing elements to form mineralized hydrothermal fluid which deposited gold with magmatic fluid at Yanshan period.
1994 Vol. 3 (3): 201-207 [Abstract] ( 31 ) [HTML 1KB] [ PDF 451KB] ( 143 )
208 THE MINERALIZATION ZONING FEATURE OFXIAOQINLING GOLD DEPOSIT ZONE IN LINGBAO COUNTY,HENAN PROVINCE
Wang Keyong, Lu Zuoxiang
The Xiaoqinling mineralization zone trending east to west included five gold mineralization abundant zons(subore zone),in Wenyu-Yangzhaiyu subore zone,the ore veins are the most dense,the quantities of ore deposit are the inost. There are two kinds of gold mineralization in this region, that is gold-bearing quartz vein type and altered rock type, they have the supplementary feature in space and certain zoning tendency. In the whole region,from west to east, quartz vein type of mineralization became weak, and altered rock type of mineralization became strong. At the east part of Xuejashan,rock body contributed some small deposits of altered rock type. Gold-bearing quartz vein type of mineralization developed mostly in the shallow part,while altered rock type of mineralization developed mostly in the deep part.
1994 Vol. 3 (3): 208-215 [Abstract] ( 32 ) [HTML 1KB] [ PDF 451KB] ( 486 )
216 GOLDD EPOSIT TYPE IN TONGBAI-SHANGCHENG AREA
Shao Jun, Pang Qingbang, Ma Qibo, Wang Konghai
The gold deposits in Tongbai-Shangcheng area are classified into three types,i.e. the magmatic hydrothermal deposit occurrenced in Carbonaceous-clay metamorphosed rocks and in granites, and the gold deposits occurreneed in shear zones. In this paper,the geological characteristics and mineralization conditions of each type gold deposit are summarized. And pointed out, the main auriferous formation in this area is the carbonaceous-clay terrigenous clasfics-carbonate rocks formation,in between that placed volcano-sedimentary. The formation offered mineralised material to gold deposits. The prospecting orientations are the areas of the auriferous formation occurred.
1994 Vol. 3 (3): 216-224 [Abstract] ( 27 ) [HTML 1KB] [ PDF 760KB] ( 126 )
225 A STUDY ON GEOLOGICAL BACKGROUND,GEOLOGICAL CONDITIONS AND GOLD MINERALIZATION IN THE NORTH HUAIYANG REGION,ANHUI PROVINCE
Xu Guizhong, Bian Qiantao, Wang Yifen, Qi Jinying, Gao Haozhong
A series of gold deposits and spots occured in Late Jurassic volcanic rock zone of north Huaiyang region, Anhui province.They can be divided into three types:hypabyssal magmatic, subvolcanic and volcanic hydrothermal types,The zone located in north of Dabie collision orogenic belt bounded by the Mozitan-Tongcheng,the Jinzai-Shucheng deepseated fault in south and north respectively, with truncated by Tancheng-Lujiang fault zone in east and extends westwards into Henan province, The basement of the volcanic rock zone consists of Paleoproterozoic Dabie Group complex and Sinian Foziling Group. Their primary rocks are a suite of basic volcanic-sedimentary rock formation with the mafic-ultramafic rock as a primary mineral source bed of gold. The tectonic development, Mesozoic magmatism and gold-mineralization are controlled by the Mozitan-Tongcheng deep fault.The distribution of the three types gold deposits is characterized by vertical zonation, similar to a building with three storeys,which has important significance for exploration of the gold deposit in this area.
1994 Vol. 3 (3): 225-232 [Abstract] ( 36 ) [HTML 1KB] [ PDF 754KB] ( 204 )
233 THE METALLOGENETIC CONDITIONS OF THE SUPERMICROGRAIN-TYPE GOLD DEPOSITS IN NORTHWESTERN GUANGXI AND ITS MINEROGENETIC PROGNOSES
Guo Jiahui
This paper summaryly introduced the regional geological characters of Northwestern Guangxi, geological characters of the typical deposits of the super micrograin-type gold deposits,and analysed the metallogenetic conditions of the gold deposits, which consist of:conditon of the source bed, control factors of sedimetary facies and formation,ore-controlling condition of the structure,physical and chemical conditions of the mineralization and conditions of the superficial oxidation leaching and enrichment and preservation, On the basis of these,it probed into mineralization and metallogenic model,and established prespecting model. Lastly, it conducted minerogenetic forecast on various scales,and defined the thinking of the prespecting the superbig-type gold deposit.
1994 Vol. 3 (3): 233-240,200 [Abstract] ( 26 ) [HTML 1KB] [ PDF 845KB] ( 193 )
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