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1998 Vol.7 Issue.2,
Published 1998-06-30
81
THE GEOCHEMICAL FEATURE OF AURIFEROUS VOLCANIC ROCK SERIES IN CENTRAL JILIN
Zhu Qun, Li Zhitong
The auriferous volcanic rocks in central Jilin may be divided into Early Carboniferous Yufutun stage and Late Triassic Nanloushan stage with RbSr ages of 301Ma and 222Ma respectively.Yufutun formation consists of spilite, spilitic porphyrite, keratophyre and quartz keratophyre.Nanloushan formation consists of andesite, dacite, rhyolite, basaltic andesite and latite.They both petrochemically belong to calcitealkaline volcanic rock series of subalkaline system. Yufutun formation is of sodium type;and Nanloushan formation, potassium type.The Σ REE content(111×10
-9
~256×10
-9
) is enriched in LREE, with a right sloping distribution pattern and negative Eu anomaly(WEu0.93~0.75).In the above two rock associations, the mean content of Au are 28×10
-9
and 72×10
-9
respectively, the initial volume of Sr are 0.70492 and 0.70533 respectively.The study shows that Yufutun stage volcanic rock formed in a tensional environment, that is MiddleLate Palaeozoic riftdepression syncline, and Nanloushan stage volcanic rock was the products of active continental margin beginning from Late Triassic.
1998 Vol. 7 (2): 81-90 [
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91
MECHANISM AND THE CHARACTERISTICS OF STRATABOUNDTYPE ORE DEPOSIT
Ling Qicong, Zhou Guibin, Huang Xuchen, Yan Yuqin
The stratabound type skarn ore deposits are commonly seen in Tongling,Anhui Province.As an example,Datuanshan Cu-Au ore deposit is discussed in the paper.The characteristics of this kind of ore deposit that are different from common skarn one are as follow:(1)The skarn and ore bodies occur along the strata of the country rock as mainly quasistratiform.No alteration zoning between skarn and magmatic rocks can be seen as that in common skarn.(2)The major factors controlling ore-forming processes are strata,lithology,magmatic rock and detachment among strata.(3)The ore-forming mechanism is infiltration-diffusion metasomatism.Other characteristics such as mineral assemblages,ore-forming stages and temperature,salinity of ore-forming fluid,etc.,are similar to those of common skarn ore deposits.
1998 Vol. 7 (2): 91-95,103 [
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96
CHARACTERISTICS OF MAGMATITE AND ITS RELATION TO GOLD MINERALIZATION OF TANJIANSHAN GOLD FIELD
Guo Jiahui
The magmatic rocks in Tanjianshan gold field are mainly intrusires with various features, which made up late Variscian Tanjianshan plagiogranite porphyry complex. The rocks of the complex are the product of comagma during different evolution stages. The complex is commonly altered. The mineralizing alteration is especially strong where the controlling faults cut through. Some of them form orebodies. The evolution sequence of magmatic rocks and gold mineralizing is plagioaplite or granite aplite→ plagiogranite-porphyry (main stage)→quartz diorite(stock) and diorite porphyrite porphyrite(vein)→minette(vein)→granite porphyry(vein)→gold mineraling alteration. The general tendency is tow ards acidic evolution, forming post-magmatic hydrothermal rich in materials, migrating to favourable geologic structure site and precipitating gold.
1998 Vol. 7 (2): 96-103 [
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104
STRESS FIELD EVOLUTION IN MESOZOIC ERA IN ERGUN REGION AND ITS RELATIONSHIP TO GOLD-LEAD-ZINC ORE DEPOSITS
Zhang Hong, Quan Heng, Zhang Jiongfei, Jin Chengzhu
In Ergun region, there are mainly three periods of stress fields during Mesozoic Era, i.e., Indosinian period (T
2
J
1
), Tamulangou periods of(J
3
)and Shang kuli period (K
1
).In Indosinian period, the orientation of primary stress is NNW-SSE, and two large ductile shear zones striking 0~20° were formed.In Tamulangou period, the orientation of primary stress is NWW-SEE, and two groups of conjugate joints striking respectively 60~90° and 320~340° were developed.In Shangkuli period, the orientation of primary stress is NNE-SSW, which made the conjugate joints formed in Tamulangou period remove as fractures, reverse faults, etc. There are many gold, lead and zinc ore deposits(spots)in Ergun.The attitudes of orebodies are identical with the structures formed in Tamulangouperiod and Shangkuli period.Therefore in Mesozoic Era, the master ore forming periods are Tamulangouand Shangkuli periods.The prospectimg for gold deposits in the region should be focused on or beside the two large shear zones.
1998 Vol. 7 (2): 104-113 [
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114
COMMERCIAL TYPES OF GOLD DEPOSITS IN CHINA
Li Jingchun, Pang Qingbang, Li Wenkang, Shao Jun, Li Shu
Aurifero us geological body is the major and direct factor to define the commerial value of a deposit. Based on the characteristics of auriferous bodies, the gold deposits in China can be commercially classified into 10 types, which are (1) auriferous quartz, (2) auriferous mylonite, (3) auriferous altered cataclasite, (4) auriferous adular-sericite quartz, (5)auriferous breccia, (6) auriferous skarn, (7) fine impregnated mineralization, (8) auriferous gossan, (9) auriferous laterite, and (10) auriferous sandy gravel.
1998 Vol. 7 (2): 114-120 [
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121
GOLD PROSPECTING IN CENTRAL JIANGXI PROVINCE
Qian Jiaofeng, Xu Jing
Central Jiangxi Province (27~28°N latitude) is rich in gold resources and with favorable mineralizing conditions.There is a series of source beds for gold.Multistage structural-magmatic activities have taken place.Some gold deposits and prospects were found recently.Based on the characteristics of known deposits, an empirical model for gold prospecting is established as follow'. Proterozoic-early Paleozoic (volcanic) sedimental-metamorphic rock series are regarded as the mineralizing background, in which the potential areas for gold are within the epimetamorphic rocks of the regional metamorphic belt, within the positions with developed faults, and within the places where there are both Caledonian Yanshanian acidintermediate intrusives or intermediate-basic dikes and gold mineralization.
1998 Vol. 7 (2): 121-129 [
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130
THE GENESIS OF JINPING GOLDSILVER DEPOSIT,FUJIAN PROVINCE
Su Youqing
Jinping Au-Ag deposit, occurred in the volcanic rock of Upper Jurassic Nanyuan formation on the east of the Mesoproterozoic metamorphic basemental tectonic window, is composed of No.Ⅰmineralized altered fracture zone, No.Ⅱ and Ⅲ quartz veinlet belts, and altered auriferous andesite.The ore-forming solution is characterized by low
18
O and high water/rock value, suggesting that the mineralizing medium should be meteoric water.The deposit is of heated meteoric water hydrothermal deposit.
1998 Vol. 7 (2): 130-133 [
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134
GEOLOGICAL CHARACTERISTICS AND METALLOGENIC MODEL OF THE SHIJIAPUZI GOLD DEPOSIT,JILIN
Feng Shouzhong, Yang Fuding
The Shijiapuzi gold deposit, tectonically located in the north of Liao-Ji rift in the north margin of North China platform, is the type of altered rock of stratabound fracture zone superimposed and reformed by postmagmatic hydrothermal. The deposit was formed during early Yanshanian period.The metallogenic temperature ranges from 180 to 300℃.The ore-forming material is derived from strata, partly from magmatic rocks.The ore bodies are controlled by faults. The Sisotopic composition shows that it is derived mainly from plutonic syntectic magma, partly from strata.The O and C isotopic composition indicates that the ore-forming solusion is mainly magmatic water, mixed with a little metamorphic and meteoric water.
1998 Vol. 7 (2): 134-142 [
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143
ON HYDROTHERMAL ROCK
Zhang Jiongfei, Ren Meiming
Hydrothermal rock is consisted of minerals formed by crystallization in hydrothermal solution.As magmatic rock, sedmertary rock and metamorphic rock, hydrothermal rock is a kind of independent rock.Hydrothermal rock is different from sedimentary rock formed by chemical action, e.g., in sloution temperature and genetic environment.Hydrothermal rock is formed in hydrothermal solution and space within rocks (e.g.fissure), while sedimentary rock is formed in normal temperature and deposit basin.The difference between hydrothermal rock and magmatic rock is that magmatic rock is the product of magma through cooling and coagulation.Hydrothermal rock is not influenced by metamorphism, that is different from metamorphic rock.Hydrothermal rock is more closely related to metasomatite.The main difference is that all minerals for hydrothermal rock are derived from hydrothermal solution, while metasomatite is formed by the metasomatism of hydrothermal solution with wall rocks.
1998 Vol. 7 (2): 143-148 [
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149
DISCUSSION ON THE ECONOMIC AND ENVIRONMENTAL RESULTS IN EXPLOITATION OF GOLD RESOURCES
Chen Shuwang
The author introduces the economic and environmental situation of gold exploitation in eastern Hebei Province as an example, and suggests that the comprehensive study of economic and enviromental states be important to perfect the relative legal system, utilize the resouces properly, protect the environment effictively, and develop the local economy sustainably.
1998 Vol. 7 (2): 149-151 [
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152
1998 Vol. 7 (2): 152-154 [
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155
1998 Vol. 7 (2): 155-158 [
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159
1998 Vol. 7 (2): 159-160 [
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