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1997 Vol.6 Issue.1,
Published 1997-03-31
1
TEMPORAL AND SPATIAL DISTRIBUTION FEATURE OF THE EPITHERMAL GOLD DEPOSITS IN TETHYAN TECTON IC DOMAIN, SOUTHWESTERN CHINA
Wei Zhenhuan, Jing Chenggui, Yang Qingde, Wang Yuming
The epithermal gold deposits in Tethyan Tectonic Domain,Southwestern China,can be divided into 3 types which can be subdivided into 7 sub-types.They are:Ⅰ.volcanic-subvolcanic hydrothermal type,including (Ⅰ
1
)gold deposits related to volcanic rock and (Ⅰ
2
) gold deposits related to subvolcanic rock;Ⅱ.ground thermal brine type,including (Ⅱ
1
) gold deposits hosted in fine-grained clastic sedimentary rock,(Ⅱ
2
) gold deposits hosted in carbonate rock,(Ⅱ
3
) gold deposits hosted in volcanogenic clastic rock,and (Ⅱ
4
) gold deposits hosted in carbonacious,silicious and argillaceous rock;and Ⅲ.vocanic hot-spring type,i.e,the gold deposits occured in the hot-spring system The temporal and spatial distribution regularity of the epithermal gold deposits in the tectonic domain are as follow:1)The gold deposits which occured in the tectonic unit with long active history are generally in great number and large scale Structurally,the deep-seated fault controlls the concentrated area of gold mineralization;the second order faults,the gold fields and gold deposits;and the cataclastic zones,the distribution of the ore bodies.2)The Triassic system in the area is dominant stratum that hosts gold deposits,and then Cambrian and Permian systems.And 3)gold mineralization mainly took place in Yanshanian and Himalayan epoches Based on the discussion mentioned above,the Tethyan Tectonic Domain in Southwestern China is divided into 6 metallogenic provinces and 21 metallogenic belts,each of which and whose prospecting potentiality are discussed in detail.
1997 Vol. 6 (1): 1-12 [
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13
TECTONO-GEOCHEMICAL CHARACTERISTICS OF THE DUCTILE SHEAR ZONE TYPE GOLD DEPOSIT IN KAN GGUL, XINJIAN G
Zhang Lianchang, Zeng Zhangren, Yang Xingke, Ji Jinsheng, Zhao Lunshan
Kanggul gold deposit occurs in a second-order shear zone within a large-size ductile shear zone on the northern margin of Carboniferous island arc volcanic area.Orebodies,hosted by altered phyllonite and mylonitized volcanic rocks,are parallel to the steep-dipping mylonite zone.The wall rock alterations include silicification,chloritization,sericitization and pyritization.Geological studies show that the tectonic altered metallogenic characteristics have zoning phenomenon.The doposit is a product of polyphase evolution.The ore materials were derived from volcanic rocks.The ductile shearing is not only an ore controlling structure,but also a kind of mineralization by its ductile deformation and metamophism.A model of metollogenesis of ductile shear zone gold deposit of Kanggul is established.
1997 Vol. 6 (1): 13-21 [
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27
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22
ON THE METALLOGEN IC GEOCHEMISTRY OF PRECIOUS METAL OF KALATONGKE Cu-Ni DEPOSIT, XIN JIANG U. Z.
Parat Abdukadir, Huang Jianhua
Kalatongke sulphide copper and nickle deposit can be divided into three genetic types in intrusive sequence-liquation,injection and hydrothermal superposition types.The last two have a close relation to precious metal mineralization,especially the hydrothermal mineralization.For example, the precious metal(Au,Ag,Pt and Pd)is mainly enriched in high copper massive ore body that separated from the hydrothermal mineralized fluid.The deep melt time of ore-bearing magma in magma house is opposite to the intrusive sequence of each genetic type of ore body. Cu,Ni and precious metal ore body is formed through deep-liquation and mutiple pulsative mineralization.
1997 Vol. 6 (1): 22-26 [
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30
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27
GEOLOGICAL CHARACTERISTICS AND GENESIS OF CHAN GKENG GOLD DEPOSIT IN GUANGDONG
Guan Kang, Qiu Youshou, Yan Zhuyun
Through the research on the features of ore-bearing genetically complex breccia zone, gold minerals, trace elements, REE fluid inclusions, and S, H and O isotopes, the authors conclude that the ore-forming material were mainly derived from carbo nate rocks of lower Carboniferous. Superim position of detachment fault on unconfo rmable contact controlled the ore. The orebody is hosted mainly by the breccia zone. Mineralizing fluid was dominated by meteoric water. The genesis belongs to epithermal deposit.
1997 Vol. 6 (1): 27-37 [
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34
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38
SULFUR, LEAD, HYDROGEN AND OXYGEN ISOTOPIC GEOCHEMISTRY OF SHUIJIN GTUN GOLD DEPOSIT IN HEBEI PROVINCE
Shi Sen, Yang Tingdong
By comparing Shuijingtun gold deposit with typical gold deposits in the same region on S-Pb-H-O isotopic geochemistry, the authors conclude that metallogenetic material was derived mainly from Shuijingtun structural stratigraphic unit. Archeozoic regional metamophism only resulted in initial enrichment of gold. Structural-magmatic activity in Indo-Chinese-early Yanshan epoch helped to bring about the main body of quartzveins. The inherited structural-magmatic activity in Yanshan epoch was the main factor of gold mineraliza-tion. Mineralizing fluid was mainly originated from magmatic water. It's defined that Shuijingtun gold deposit is of stratabound magmatic hydrotherm altype. Its metallogenic modle is established.
1997 Vol. 6 (1): 38-46 [
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47
ON THE PECULIARITIES OF GOLD DEPOSITS AND THEIR SIGNIFICANCE IN GEOLOGICAL RESEARCHES AND EXPLORATIONS
Zhang Baolin, Cai Xinping, Wang Jie, Gao Haozhong
In the past, the peculiarities of gold deposits were not paid more attention and quite a lot of problems appear in the geological researches and explorations, which caused to some wrong conclusions on gold deposits. The paper discusses the peculiarities of gold deposits and theiri mportance to the researches and explorations of the deposits.
1997 Vol. 6 (1): 47-53 [
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54
FRACTAL DIMENSIONS OF GOLD-VEIN AND APPLICATIONS IN GOLD DEPOSIT PROSPECTING
Li Hongzhi, Song Yuguo
Fractal dimensions of gold-veins were analysed based on fractal dimensions (
D
), chunkiness (
C
) and compactness (
E
) of the gold-veins from different horizations of Lingshan gold deposit. An example for finding gold deposit was given to illustrate good a pplication of geology and fractal dimensions method.
1997 Vol. 6 (1): 54-62 [
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63
COMPARISON OF GOLD DEPOSITS BETWEEN NORTH CHINA AND WESTERN AUSTRALIA CRATONS AND ITS GUIDANCE TO GOLD EXPLORATION IN CHINA
Luo Zhenkuan, Miao Laicheng, Guan Kang, Huang Jiazhan
North China craton is a later-solidified and more active craton,from which more than 50% gold of China is mined.Ore-host rocks are mainly meso-hypometamorphic mafic rocks and granitoid.Large-cale gold deposits accour in the superimposed structural zones of ductile and brittle shearing.Granitoid rocks are broadly distributed in the craton.Ore bodies are in stratiform,lens,veins or pipes.Most of them are large quartz vein type.Mineral compositions are chiefly guartz,sericite,K-feldspar and pyrite.Au is associated with Cu,Pb,Zn,Ag,W,S,As,Bi and Sb.Wall-rock alteration types indude silicification,sericitization,pyritization,K-feldspathization,carbonation and chloritization.The mineralization age is 188~46Ma.
Western Australia craton is an earlier-solidified and stable one.Almost 70% gold of the continent comes from W.A.Most gold deposits occur in Archeozoic granite-greenstone terrains of Yilgarn block.Structurally,major deposits are distributed in the fransitional or superimposed zones of ductile brittle shearing.Granitoid rocks occupy Yilgarn block by 2/3 area.The occurences of ore bodies in W.A.craton have no difference from those in N.China craton.Shear zonal and metasamatic types of deposits are dominated in W.A.Main minerals in ore are quartz,sericite,albite,chlorite,amphibole,carbonate,pyrite and arsenopyrite.Alteration types include pyritization,silicification,sericitization,chloritization,carbonation,albitization and Cr-V-micatization-The mineralization age is 2640~2600Ma.
Comparing to its counterpart in W.A.craton,the mineralization in N.China craton is much later.The craton has undergone less denudation Many deposits have not outcropped.The exploration for gold in N China craton is promissing.
1997 Vol. 6 (1): 63-71 [
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72
R. H. Boer
1997 Vol. 6 (1): 72-76 [
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77
1997 Vol. 6 (1): 77-80 [
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14
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