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2016 Vol.25 Issue.4,
Published 2016-08-31
309
FORMING AGE AND GEOCHEMICAL CHARACTERISTICS OF THE XINFATUN ROCK BODY IN HORQIN YOUYI ZHONGQI, INNER MONGOLIA
LI Zi-hao
The Xinfatun rock body, located in Horqin Youyi Zhongqi, Inner Mongolia, is dominated by granodiorite, with SHIRMP U-Pb dating age of 138±10 Ma, which belongs to Early Cretaceous. Geochemical data show that the rock body is of cale-alkaline series, with enrichment in K, Rb, Ba and Th and relative deficiency of Sr, Ta, Nb, P and Ti. The REE distribution curves are rightward inclined, showing obvious fraction of LREE and HREE and negative anomaly of Eu. These characteristics indicate that the Xinfatun rock body was formed in late orogenic environment and was the product of crustal uplift after plate collision.
2016 Vol. 25 (4): 309-316 [
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61
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317
STUDY ON THE MINERALOGICAL CHARACTERISTICS OF TOBERMORITE
HE Yan, YANG Hui-xuan, ZU En-dong
Tobermorite is a kind of calcium silicate hydrate. By electron microprobe analysis, the chemical formula of tobermorite from Nammaw jadeite orebody in Myanmar is(Ca
4.424
K
0.021
Mg
0.003
)
4.448
(Si
5.731
Al
0.728
)
6.465
O
16
(OH)
2
·4H
2
O, which is almost consistent with the classic chemical formula of Ca
5
Si
6
O
16
(OH)·
2
·4H
2
O. The result of X-ray diffraction analysis(XRD) shows that the studied tobermorite belongs to the 1.4 nm type. Through microscopic observation, XRD and electron microprobe method, this tobermorite occurs as radial fibrous aggregate in yellowish-brown color, with low positive relief and I-order yellow interference color. The mineral is optically biaxial positive with an optic axial angle of 53°.
2016 Vol. 25 (4): 317-321 [
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64
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322
GEOLOGICAL CHARACTERISTICS AND METALLOGENIC MODEL OF THE HUANGHUASHAN GOLD DEPOSIT IN JIANPING, LIAONING PROVINCE
LIANG You-wei
The Huanghuashan gold deposit is of important hydrothermal alteration rock type in Jianpng, Western Liaoning Province. The Neoarchean metamorphic basement of gneiss is the source bed for gold. The Mesoproterozoic intrusive rocks serve as the main host of gold ore. The Late Jurassic intrusive rocks are metallogenic rock bodies of the deposit. The imbricated thrust nappe structure from northwest to southeast was formed in Indosinian period in Huanghuanghua area, which provided space for the mineralization. Because of the intense Yanshanian magmatic activity, with which the intrusions remelted the underlying source bed or captured the high-Au strata, the ore-forming hydrothermal fluid run upward along the Huanghuashan imbricated thrust nappe structure and accumulated to form gold orebodies in the structural belt. With analysis of the ore-forming process, the metallogenic model of Huanghuashan gold deposit is set up.
2016 Vol. 25 (4): 322-326 [
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43
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451KB] (
220
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327
RESEARCH ON THE RELATIONSHIP BETWEEN THE LAMPROPHYRE AND GOLD MINERALIZATION IN BUSHANG GOLD DEPOSIT, EASTERN SHANDONG PROVINCE
MA Xiao-dong, SUN Bin, SONG Ying-xin, SUN Yu-qin, CHENG Wei, WANG giang, NIU Zhi-li, YIN Ji-guang
In order to reveal the inner relations and origins of the lamprophyre and gold ores in the Bushang gold deposit in Eastern Shandong Province, on the basis of geological and petrological researches, the authors adopt wet-chemical approach, volumetric method, non-aqueous titration and spectrophotometry to analyze major elements, with IPS-AES, ICPMS, AFS and AAS methods for trace elements and rare earth elements. Study shows that the lamprophyre and gold ore are both derived from the I-type enriched mantle source (EMI), although the gold ore is mixed with crustal source material. According to the tectonic features, it is considered that the lamprophyre is from EMI magma, while the gold is from the volatile and oxidable ore-forming gas-liquid fluid of EMI, showing the characteristics of gold mineralization in the area with deep-seating, multi-position, multi-period and diversity.
2016 Vol. 25 (4): 327-335 [
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65
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1225KB] (
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336
GEOLOGICAL FEATURES AND ORE-SEARCHING INDICATORS OF THE MAIDITIANXIN COPPER DEPOSIT IN YUNNAN PROVINCE
WANG Jia-yin, QI Chang-wei, LIU Lei, JIN Hao, ZHAO Lin-shan, ZHOU Jin
The small sized Maiditianxin copper deposit, located in Yangbi County, Yunnan Province, is mainly controlled by faults. The orebodies occur in the lower member of Jingxing Formation, Lower Cretaceous (K
1
j
1
). The ore veins are hosted in the medium-thick layered quartz sandstone, which is simply fading altered sandstone. The orebodies are small, with oxidation rate between 73.61% and 92.64%, belonging to high oxidation ore. By preliminary analysis, the genesis of the deposit is sedimentary-hydrothermal reformed type, closely related to the interbedded structural alteration zone in the "West Yunnan red beds".
2016 Vol. 25 (4): 336-338 [
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50
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339
CLASSIFICATION AND METALLOGENIC FLUID CHARACTERISTICS OF THE TUNGSTEN DEPOSITS IN SOUTHERN JIANGXI PROVINCE
XU Fan-chang, LI Bao-hua, LI Biao-peng, WANG Qiang, GAO Kun-li, DENG Dan-li
The Southern Jiangxi Province is the most important producing area of tungsten in China. The types and classifications of the tungsten deposits are numerous and inconsistent. Based on the analysis and summarization of previously and newly discovered tungsten ore resources, the authors brief the types and metallogenic geological characteristics of each type of tungsten deposits in the area. With study on the data involving fluid inclusion petrography, microthermometry, hydrogen and oxygen isotopes of different types of tungsten deposits, the characteristics of metallogenic fluid are discussed. It is concluded that the fluid inclusions are dominated by liquid-rich phase, rarely with daughter mineral-bearing three-phase inclusions, CO
2
inclusions and fluid-melt inclusions, with various levels of temperature values, showing the characteristics of multi-stage fluid overlapping. The ore-forming fluid belongs to high temperature, low salinity and low density NaCl-H
2
O-CO
2
system, mainly derived from magma, with later addition of atmospheric precipitation.
2016 Vol. 25 (4): 339-344 [
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] (
44
) [
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491KB] (
188
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345
GEOLOGICAL CHARACTERISTICS OF BAUXITE DEPOSIT IN THE DEEP OF YANLONG OREFIELD IN HENAN PROVINCE
LI Jian-quan, ZHOU Hong-chun, CAO Gao-she, ZHANG Qing, CHEN Guang, CHEN Yong-cai, YANG Yuan-yuan
The Yanlong bauxite deposit, which occurs in Carboniferous Benxi Formation on the Middle Ordovician erosion surface, is a typical concealed bauxite deposit in western Henan Province. The thickness of ore-bearing formation and shapes of bodies are controlled by the paleo-karst erosional surface, and are greatly influenced by structures. The dominant Al-bearing minerals include diaspore, kaolinite and illite. The upper and lower parts of the bauxitic mudstone are mainly based on kaolinite and illite respectively. The paragenetic minerals of bauxite have a great value, while the associated minerals need further study.
2016 Vol. 25 (4): 345-350 [
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48
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816KB] (
178
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351
GEOLOGICAL CHARACTERISTICS OF THE SHALLOW OREBODY IN THE WACHANGPING BAUXITE DEPOSIT IN GUIZHOU PROVINCE
ZHOU Qi, YU Wan-song
The Wachangping bauxite deposit is located in the Wuchuan-Zhengan-Daozhen bauxite metallogenic belt in Northern Guizhou Province, which belongs to middle mountain landform with intense dissection. The shallow orebody is on the eastern wing of the Luchi syncline between No. 7 and No. 17 exploration lines, with a length of 1000 m along the strike and 110-187 m in the direction of dip. The ore occurs in the Middle Permian Liangshan Formation, overlaid by the carbonate rock mountain body. The orebody is in bed form, in consistent occurrence with the wallrocks, with 2.55 m in average vertical thickness, 0-187 m in buried depth and 11-26° in dipping angle. The faults F1 and F2 enter and evanesce in the orebody.
2016 Vol. 25 (4): 351-355 [
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47
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224
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356
GEOCHEMICAL CHARACTERISTICS OF STREAM SEDIMENT AND ORE PROSPECTING OF THE DIBAONAMUGANG OREFIELD IN TIBET
ZHANG Wen-lei, YU Tao, LIU Tang, WANG Dong, XIONG Yi-jun
With the software of SPSS, the geochemistry data from 1:50 000 stream sediment survey in the orefield are analyzed. Adopting the average values plus or minus 3 times of standard deviation as bounds to eliminate the eigenvalues of original data, until the data obey normal distribution. Finally, taking the average values plus 2 times of standard deviation as anomaly thresholds(
T
), with 1
T
, 2
T
and 4
T
as concentration zonation, to draw element anomaly maps, involving single element anomaly of Cu, Au, Ag and Mo and assemblage anomaly of Au-Ag-Mo. The overlap analysis of ore deposits/occurrence with geological characteristics shows that the anomalies are controlled by strata, faults and wallrock alterations, which are indicators for the searching of orebodies. Eventually, two prospecting areas are selected.
2016 Vol. 25 (4): 356-359 [
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54
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360
ANOMALY OPTIMIZATION BY ELEMENT ENRICHMENT AND QUANTITATIVE EVALUATION FOR PROSPECTING
YANG Ji-quan, YANG Qin
With the example of Ershiyizhan orefield in Tahe County, Heilongjiang Province, this paper adopts element enrichment degree to optimize the soil anomaly. On this basis, the prospecting significance of the anomaly is quantitatively evaluated. With the variety of geological conditions in the orefield, the secondary halo anomalies of elements show a regular distribution, while the enrichment degrees of elements are obviously in regular changes. Therefore, according to the metal contents of surface rocks in geophysical and geochemical anomaly divisions, the element enrichment degrees can be defined. By sorting for absolute and relative degrees of enrichment, the most favorable anomaly for gold prospecting is optimized. With comparison to the anomalies of known deposit, the inferred mineralization possibility may be quantitatively interpreted.
2016 Vol. 25 (4): 360-364 [
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38
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324KB] (
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365
DISTRIBUTION AND CONNECTIVITY OF THE JURASSIC SKELETAL SAND BODIES IN THE EAST OF HALA'ALATE MOUNTAIN, JUNGGAR BASIN
WANG Xu-hui, WU Kong-you, WANG Ze-sheng, QIE Run-zhi
Skeletal sand body is one of the components of petroleum transportation system, in which the distribution of oil and gas is commonly affected by the sealing capacity of faults and the heterogeneity of sand. On the basis of regional stratigraphic framework and sedimentary facies, this paper studies the distribution and connectivity of the skeletal sand bodies in Jurassic Badaowan and Sangonghe formations. Analysis of the width-thickness ratio of sand body in the study area reveals that, when sand thickness in single well is above 30 m, the sand is considered as being connected between the wells. The regional connecting-well sections shows that the sand bodies in J
1
b
1
, J
1
b
3
and J
1
s
2
strata are large in size, with good connection. As the major Jurassic reservoir layer in the area, the differences of fault occurrences and sealing properties in the J
1
b
1
is the main reason for the variability of oil-gas distribution. The variation tendency of permeability in J
1
b
1
sand is consistent with that of porosity, but there is an obvious partition between the west and the east. The central junction zone has poor porosity. There is a good correlational dependence between the planar distribution of petroleum and the variation of micro-physical properties. This also proves that the micro-physical properties of sand body can affect the connection.
2016 Vol. 25 (4): 365-372,394 [
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38
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1287KB] (
220
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373
STUDY ON THE POTENTIAL ECOLOGICAL RISK ASSESSMENT OF TOXIC ELEMENTS BASED ON GEOCHEMICAL DATA:An Example from Aohan Qi, Inner Mongolia
LIU Qiang, MENG Yu-tuo, LI Wei, WANG Chang-qi, CHEN Jing-sheng
With growing environmental pollution, various pollutants enter the human bodies in different ways to threaten human health. Heavy metals are the dominant pollutants in soil. Among them, Hg, Cd, Pb, Cr and metalloid As have significant biotoxicity, while Zn, Cu, Ni, Co and Sn are with moderate biotoxicity. This paper adopts the 1:50 000 water and soil geochemical survey data of Aohan Qi sheet to evaluate single element pollution level with single factor pollution index. With the toxicity response coefficients of heavy metal elements, the potential risk areas of toxic elements are assessed. The result shows that the potential ecological risk elements in the study area are mainly Cd, Pb and As, of which Cd is the most harmful. The major potential pollution factors are human geological factors, such as quarries, mining sites and garbage dumps, and primary geological environmental factors.
2016 Vol. 25 (4): 373-379,400 [
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39
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851KB] (
188
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380
CHARACTERISTICS AND DEVELOPMENT OF THE THERMAL STORAGE SYSTEM IN THE NORTH OF SONGLIAO BASIN
GUO Ang-qing
The Songliao basin, which belongs to continental lacustrine basin formed by Meso-Cenozoic large fault depression, is a typical sedimentary basin type of within-plate geothermal belt. The northern part of Songliao basin is not only an extra-large sandstone type of oil and gas field, but also an extra-large stratiform geothermal field with low, medium and high temperature. Study and analysis on previous data confirm that there distributed four capping beds of mudstone and four thermal reservoirs from top to bottom in northern Songliao basin, which compose four thermal storage systems. Up to present, the geothermal resources in the north of Songliao basin have not been systematically studied on the evaluation of regional exploration, except for local exploration and evaluation. There is not any regional development and utilization plan yet, although some preliminary small-scale extensive activities were conducted. The development and utilization degree is low, with serious waste of resources. Based on the above analysis, countermeasures and suggestions for the development and utilization of geothermal resources in northern Songliao basin are put forward.
2016 Vol. 25 (4): 380-385 [
Abstract
] (
46
) [
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1KB] [
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292KB] (
183
)
386
RELATIONSHIP BETWEEN REMOTE SENSING INTERPRETED CIRCULAR STRUCTURES AND GEOCHEMICAL ANOMALY: Application in the Zhalaihe Farm Anomaly Area, Inner Mongolia
SHI Jian-min, YOU Hong-xi, WEI Ming-hui, ZHAO Chun-qiang, SHI Yi, SHI Shao-shan, SHI Zhe
Carboniferous strata are well developed in Fengshou area of Aohan Qi, Inner Mongolia. The Upper Carboniferous Jiujuzi Formation, composed of a set of terrigenous clastic rocks, is specific in the region. Based on the rock assemblage, fabrics and vertical variation regular pattern, one sequence of third-order is recognized, including two sequences of forthorder and five sequences of fifth-order(high frequency cyclic sequence).
2016 Vol. 25 (4): 386-394 [
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44
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1272KB] (
174
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395
PRESENT SITUATION AND POTENTIAL ANALYSIS OF GEOLOGICAL HAZARDS IN TIANCHI OF CHANGBAI MOUNTAIN BASED ON 3D IMAGE MODEL
FENG Yu-lin, YANG Jia-jia, CAI He
Through RS interpretation and field survey, the present situation and scale of geological hazards in Tianchi area, Changbai Mountain are recognized. With analysis of the hazard mechanism, the geological hazard zoning map is compiled, which can provide decision basis for the administration of disaster prevention and mitigation.
2016 Vol. 25 (4): 395-400 [
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48
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6855KB] (
287
)
401
DETERMINATION OF SILVER-BORON-TIN FROM MULTI-PURPOSE REGIONAL GEOCHEMICAL SURVEY BY EMISSION SPECTROMETRY
XIN Wen-fang, LI Wei, WU Xiao-meng
In order to determine the elements of Ag, B and Sn from the multi-purpose regional geochemical survey with emission spectrometry, we adopt the mixture of K
2
S
2
O
7
, NaF, Al
2
O
3
and carbon powder as solid buffer, Ge as internal standard, and blend the samples and buffers in the graphite electrode in a quality ratio of 1:1. This paper analyzes and summarizes the problems raised in the test and puts forward countermeasures. The method has obtained good results in practices.
2016 Vol. 25 (4): 401-403 [
Abstract
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32
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168KB] (
182
)
404
DIVISION OF THE MINING ECONOMIC ZONES FOR THE CHANGCHUN METALLOGENIC BELT
ZHANG Qiang, ZHANG Hai-long, HUANG Hao-ran
This paper details the geography, metallogenic characteristics and mineral resources in Changchun region, as well as the problems existing in the development and utilization of mineral resources. By the above study, based on the distribution of superior resources and the development and utilization layout of mineral resources, with the regional development planning of Changchun City, the authors propose the suggestion about the division of mining economic zones for the Changchun metallogenic belt, aiming to establish the core area of mining development, and comprehensively improve the utilization of mineral resources.
2016 Vol. 25 (4): 404-406 [
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29
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168KB] (
193
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