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2015 Vol.24 Issue.5,
Published 2015-10-31
399
DISCOVERY OF THE LARGE TIN POLYMETALLIC DEPOSIT IN THE PERIPHERAL AREA OF WEILASITUO Ag-Pb-Zn POLYMETALLIC DEPOSIT IN INNER MONGOLIA
FAN Zhi-yong, MA Li-jun, YANG Fan, WANG Yan
A large tin polymetallic deposit was found in the peripheral area of Weilasituo Ag-Pb-Zn polymetallic deposit. The estimated prospective reserves of tin is presently 93 127 t, with metal quantity of tungsten 15 800 t, zinc 32 540 t and copper 9 175 t. It is inferred that the deposit is genetically porphyry type.
2015 Vol. 24 (5): 399-401 [
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402
REVISION OF THE JURASSIC TAMULANGOU FROMATION IN THE JARUD QI AREA, INNER MONGOLIA
DING Qiu-hong, LI Xiao-hai, YAO Yu-lai, WANG Jie, ZONG Wen-ming, GAO Xiao-yong, LI Wen-bo
A suite of intermediate volcanic rocks in the Jarud Qi area of Inner Mongolia was defined as the Permian Dashizhai Formation and Qingfengshan Formation by previous researchers, but they were lack of paleontological and dating data. In the recent 1:250 000 regional geological survey, the isotopic dating samples are collected from the andesites of Dashizhai and Qingfengshan Formations defined in the former 1:200 000 geological survey. The chronology of volcanic rock samples is studied based on the laser
40
Ar/
39
Ar dating method. The result shows that the age is(172.7±2.0)-(165.2±1.3) Ma. In consideration of the clear characteristics of stratigraphic rock assemblages, sufficient time basis and certain extensibility and mapping possibility, this suite of volcanic strata is redefined as the Middle Jurassic Tamulangou Formation.
2015 Vol. 24 (5): 402-407 [
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408
GEOLOGY OF THE HADAYANG TECTONIC MELANGE IN INNER MONGOLIA:Discovery significance
FU Jun-yu, WANG yan, NA Fu-chao, YANG Fan, ZHANG Guang-yu, LIU Yin-cai, KANG Zhuang
The Hadayang tectonic melange is outcropped in the Nenjiang-Heihe tectonic belt. According to its regional geological setting and rock geological and geochemical characteristics, the tectonic melange is divided into three parts:matrix, autochthonous blocks and allochthonous blocks. The matrix is dominated by epidote-biotite-chlorite tectonic schist. The autochthonous blocks are composed of epidote-chlorite-biotite tectonic schist and possible conglomerates from outer slope of trench. The allochthonous blocks are mainly hornblendite, hybrid diorite and meta-acidic volcanic rocks. The lithogeochemical characteristics show that the hornblendite and hybrid diorite were formed in a marginal ocean expansion environment related to subduction, while the meta-acidic volcanic rocks have the characteristics of island arc calc-alkaline volcanic rocks. The characteristics above indicate that the Hadayang tectonic melange is related to the subduction-collision of plates. Combined with the feature that glaucophane appears in the Early Carboniferous meta-acidic volcanic rocks of Hongsanliang area and Paleozoic strata outcropped along the Hongsanliang-Hadayang-Yikete area are fault contact relationship between each other, the authors conclude that there is a tectonic melange belt of late Early Carboniferous along this line. The discovery of Hadayang tectonic melange belt is of important significance for understanding the NenjiangHeihe tectonic belt and its structure.
2015 Vol. 24 (5): 408-413 [
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35
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414
THE DERIWULANHADA CENTER-TYPE VOLCANIC EDIFICE IN HORQIN YOUYI ZHONGQI, INNER MONGOLIA
PAN Ming-chen, WANG Yong-mei, WANG Hai-peng, WANG Fu-jun, LIANG You-wei, LU Hong-feng, SUN Hai-long, LI Hong-mei, HU Hai-yan, MU Ya-nan, HONG Yan, XU Gui-yan
The Deriwulanhada center-type caldera edifice is the product of Late Jurassic volcanic activity, with periclinal introversion and developed annular and radial faults. The annular fractures are filled with a variety of dikes. The volcanic vent is occupied by trachyte, which is dated by isotopic age of 140.8 ±2.0 Ma.
2015 Vol. 24 (5): 414-417 [
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418
THE CRUSTAL MOVEMENT CHARACTERISTICS OF LIAODONG PENINSULA IN EARLY CRETACEOUS EPOCH:Evidence from the Lanheyu intrusive rock
WEI Ming-hui, SHI Shao-shan, YOU Hong-xi
With study on the zircon SHRIMP U-Pb age and geochemical characteristics of the Lanheyu intrusive rock in Liaodong peninsula, the high-K calc-alkali series rock is proved to be formed in Early Cretaceous Epoch. According to the formation pressure of 0.8-1.0 GPa of the Lanheyu rock body in Benxi region, it is speculated that the source materials of granite magma came from 30-40 km deep below the thin crust. In the Rb(-Y+Nb) and Y-Rb diagrams of granite, all the samples fall into the WPG (within plate granite) area, concluding the Liaodong block was in the post-orogenic stage with lithosphere thinning, which reflected an extensional tectonic environment. The Lanheyu granite provides a favorable evidence for the extensional environment during the Early Cretaceous Epoch of Liaodong continental block.
2015 Vol. 24 (5): 418-423 [
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424
THE MAIN SUBJECTS OF COMPREHENSIVE STUDY ON BASIC GEOLOGY OF METALLOGENIC BELT
ZHAO Ai-lin, OUYANG Zhao-zhuo, GAO Song
The comprehensive study on basic geology of metallogenic belt is an important foundation for metallogenic prediction. The main tasks include geological evolution and its restriction on mineralization, geological formation assemblage and genetic environment and their relation with mineralization, temporal-spatial distribution and evolution of ore-forming geological formations and assemblages. They also cover the analysis on ore-forming geological setting, involving formation assemblage and structural environment, delineation of ore prospective areas and suggestions on specific deployment of exploration. The conclusions should be expressed by the text report with series maps of geology, geophysical and geochemical anomalies, remote sensing images, as well as maps about metallogenic geological background, metallogenic prospect division and suggestions for geological work deployment.
2015 Vol. 24 (5): 424-427 [
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428
CONFIRMATION OF THE NW-TRENDING TECTONIC BELT ON THE RIGHT BANK OF HEILONGJIANG RIVER AND ITS CONTROL ON MINERALIZATION
YANG Ji-quan, YANG Qin
Based on the special geomorphology of basin-ridge structure, complex structural intersection, inheritance and continuity of multi-stage NW- and N-S-trending ore-forming structures, the control of Mesozoic granite belt and volcanic rock zone on mineralization and the unique structural trend of NW-runing geophysical anomaly, the authors confirm the existence of NW-trending tectonic-metallogenic belt on the right bank of Heilongjiang River. Many deposit examples indicate that the multi-stage NW-trending tectonic belt has several metallogenic functions like rock-controlling, ore-controlling, ore guide and host. The horizontal zonation of deposits/orebodies is obvious, which provides theoretical basis for exploration prediction on the right bank of Heilongjiang River.
2015 Vol. 24 (5): 428-432 [
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433
ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE EARLY CRETACEOUS GRANITIC ROCKS IN THE MIDDLE SECTION OF DAXINGANLING MOUNTAINS
CHEN Hui-jun, ZHANG Yan-long, WANG Qing-hai, YANG Hao, QIAN Cheng, CHEN Jing-sheng, QIN Tao, WANG Yan, WU Xin-wei, ZHANG Yu-jin
The Phanerozoic granites are widely distributed in the Daxinganling region, but the research on Mesozoic granites was relatively poor. The paper conducts a geochronological and geochemical study on the Early Cretaceous granites collected from Bijiadian pluton and Shenshan pluton on the west of Zhalantun in the middle section of Daxinganling Mountains, and discusses the petrogenesis and tectonic setting of the granitic rocks. The LA-ICP-MS zircon U-Pb dating indicates that the Bijiadian pluton is mainly composed of syenogranite and granite porphyry, with ages of 136±3 Ma, 139.5±0.9 Ma and 128.1±0.8 Ma, whereas the Shenshan pluton consists of mainly alkali-feldspar granites, with age of 119.3±0.8 Ma, which indicate that both of them were formed in the Early Cretaceous. The two plutons are geochemically characterized by high Si, low Ca, rich Alkali, negative Eu anomalies, enrichment of Rb, Th and U, and depletion of Nb and Ta, belonging to the weakly peraluminous high-K calc-alkaline series and quite similar to highly fractionated I-type granitoids. Combined with the petrological and geochronological features of the coeval granitoids in Daxinganling region, it is proposed that the formation of the Early Cretaceous granitic rocks was closely related to the delamination induced by the subduction of the Pacific plate.
2015 Vol. 24 (5): 433-443 [
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444
ZIRCON SHRIMP U-Pb AGE AND GEOCHEMISTRY OF THE TRIASSIC DIXIONGSHAN ROCK MASS IN LIAODONG PENINSULA:Geological Significance
SONG Yun-hong, HAO Li-bo, YANG Feng-chao, ZHAO Dong-fang
The zircon SHRIMP U-Pb dating result indicates that the Dixiongshan rock mass in Liaodong Peninsula, as a part of the Triassic granites found in the east of North China, was emplaced in the Triassic epoch (205.2±2.1 Ma). The whole rock chemical analysis shows that the Dixiongshan granites are characterized by high SiO 2, Al
2
O
3
and K
2
O and low TiO
2
, Na
2
, MnO and CaO, with K
2
O+Na
2
ranging from 7.88% to 9.28%, K
2
O/Na
2
≥1.16-1.46, CaO/Na
2
=0.08-0.23, A/CNK=0.95-1.10. Furthermore, muscovite appears in the mineral assemblage, which means the rock mass belongs to metaluminous-peraluminous granite. In the SiO
2
-Zr diagram, all the sample points fall in the S-type granite area. All the characteristics above suggest that the Dixiongshan granites be of metaluminous-peraluminous S-type. The REE curves and parameters show intense fractionation between LREE and HREE and distinct negative anomaly of Eu, suggesting that a fractional crystallization happened to plagioclase or other Ca-rich minerals after the formation of magma in this area, which are typical REE characteristics for metaluminous-peraluminous granites. In the primitive mantle-normalized trace element spider diagram, all the granites are enriched in Rb and Th, but distinctly depleted in Nb, Ta, Sr and Ti. For all samples, Rb=133×10
-6
-360×10
-6
, most of which are higher than the average value of granites(200×10
-6
). Sr(25×10
-6
-135×10
-6
) and Ba (48×10
-6
-507×10
-6
) are obviously lower than the average value of granites (Sr=300×10
-6
, Ba=830×10
-6
). The depletion of Ba and Sr reflects the magma experienced a relatively complete fractional crystallization. The enrichment of large ion lithophile elements (LILEs, such as Rb and Th) and the depletion of Nb and Ta indicate that the continental crust is the source rock of magma. The characteristics above show that the magma substance is from the terrigenous clastic rock. Combined with the history of regional geodynamical evolution, it is thought that the Dixiongshan rock mass is a product of the subduction of the Kula-Pacific plate towards Eurasia and response of weak extensional setting of North China lithosphere in the Late Indosinian epoch.
2015 Vol. 24 (5): 444-452 [
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453
ZIRCON U-Pb DATING OF THE NANGUSHANZI INTRUSIVE ROCK IN BENXI COUNTY, LIAONING PROVINCE:Tectonic implication
WANG Da-qian, SHI Shao-shan, YOU Hong-xi, LI Zhu-min
The Nangushanzi intrusive rock, located in the southeastern Benxi County of Liaoning Province, is lithologically medium-fine grained alkali-feldspar granite. The zircon U-Pb isotopic dating result shows that the rock was formed in the Early Cretaceous Epoch of 120-130 Ma, but not the Jurassic Epoch as previously thought. The major element features indicate that the rock belongs to high-K calc-alkaline series. The chondrite-normalized REE patterns show enrichment of LREEs, depletion of HREEs, and strongly negative Eu anomalies. The trace elements are characterized by enriched largeion lithophile elements (LILE, such as Rb, Th and K) and depleted high field strength elements (HFSE, such as Ta, P and Ti). The trace element compositions of alkali-feldspar granite suggest that the magma pressure be less than 0.8-1.0 GPa, derived from the depth of 30-40 km in the crust, belonging to thinning crust, when the Liaodong massif is under intracontinental extension environment. The study fully proves that the Early Cretaceous magmatism in eastern China developed in an extensional tectonic environment which was induced by thinning lithosphere.
2015 Vol. 24 (5): 453-460 [
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461
ZIRCON LA-ICP-MS U-Pb DATING AND ITS IMPLICATION OF UPPER PERMIAN LINXI FORMATION IN JARUD QI, INNER MONGOLIA
LI Xiao-hai, ZONG Wen-ming, SU Fei, LI Wen-bo
The study area is located in the north of Xar Moron River-Changchun-Yanji fault where the huge thick Upper Permian Linxi Formation is developed, with the lithologic assemblage of gray, grayish black and yellow-green sandy slate. The research on its chronological characteristics is of important significance for determination of the geotectonic setting. The authors analyze the sandstone samples from Linxi Formation with zircon LA-ICP-MS U-Pb dating. The results show that the ages are distributed in 5 age ranges: 252-300 Ma, 305-423 Ma, 431-555 Ma, 600-999 Ma and 1037-2460 Ma. The youngest age of 252 Ma indicates the lower limit of sedimentary time for Linxi Formation. The study above shows that the provenance of Late Permian Linxi Formation in Jarud Qi area reflects the information of both the metamorphic basement and following tectonomagmatic event in Northeast China and the northern margin of the North China Plate, suggesting that the Linxi Formation completed the final collision and collage along the northern margin of the Xar Moron River suture zone between North China Plate and the blocks on north in the Late Permian.
2015 Vol. 24 (5): 461-472 [
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473
THE OIL-GAS EXPLORATION DIRECTION OF FUXIN BASIN
WU Bing-wei, GUO Yan-min, WANG Xin, JIANG Li, WANG Hui, JI Zhen-kui
With nearly thirty years of oil-gas exploration activities, there has been no significant discoveries in Fuxin Basin. In order to further evaluate its resources potential and make new exploration ideas, based on the comprehensive study on petroleum geological condition and major controlling factors of hydrocarbon accumulation, the authors consider that the Fuxin Basin has the general conditions for conventional and unconventional oil-gas accumulation and the main exploration layers are Jiufotang, Shahai and Fuxin formations. According to the difference of hydrocarbon source rock condition among them, the upper Jiufotang and lower Shahai formations are conventional oil and gas exploration targets, the upper Shahai formation shale as gas exploration target and the Fuxin formation as coal bed methane exploration target. The hydrocarbon accumulation condition analysis indicates that the main controlling factors of hydrocarbon reservoir in Fuxin Basin are preservation and reservoir condition. The direction for oil-gas exploration in the area is searching for structural-lithologic and lithologic reservoir near sag.
2015 Vol. 24 (5): 473-477 [
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478
QUANTITATIVE EVALUATION ON THE UNCERTAINTY OF RESERVOIR GEOLOGICAL MODEL WITH DISTANCE METHOD
DAI Wei-yan, LI Shao-hua, LIU Shi-yu
Aiming at the main problems in the common evaluations on the uncertainty of reservoir geological model, this paper presents a method to calculate the differences between two models with distance function, then estimate the degree of uncertainty based on the differences. Taking the western WZ Oilfield for example, the facies-controlled physical parameters modeling technology and sequential Gauss stimulation method are used to establish 3D permeability models. Comparing and analyzing various distance functions, the results show that the Manhattan and Euclidean distance functions can describe the differences between models better. The principle of Euclidean distance function is calculating the quadratic sum of permeability value in each grid node between two models first, and then taking the square root to get a dissimilarity matrix characterized the differences between models. The difference between models can be directly obtained with the matrix:The greater the difference between models is, the greater the uncertainty of simulation result is. Finally, the comparative analysis results of intersection map and distance matrix show that this method is effective in evaluation of the uncertainty of reservoir geological model generated by stochastic simulation.
2015 Vol. 24 (5): 478-482 [
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25
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483
METHODS AND BASIS OF INTEGRATED GEOPHYSICAL INTERPRETATION OF FAULT STRUCTURES IN LIAONING PROVINCE
ZHANG Lian-zeng
With study on the Bouguer gravity anomaly Δ
g
and its potential field conversion field,aeromagnetic anomaly Δ
T
and its potential field conversion,seismic wave field and magnetotelluric field,combined with the topography and drilling data of Liaoning Province,the author comprehensively interprets the fault structures,which show the plane distribution characteristics of faults in the province.Together with the geophysical interpretation section,the vertical development characteristics of main fault structures can be recognized.The analysis reveals that the Tan-Lu fault zone is of left lateral strike slip.The faults can be divided into supracrustal fault,middle-lower crust fault and translithospheric fault.
2015 Vol. 24 (5): 483-488 [
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489
COMPARATIVE STUDY ON THE TRANSFORMATION EFFECTS OF FUSION ALGORITHM BASED ON MULTISOURCE REMOTE SENSING DATA
YANG Jia-jia, FENG Yu-lin, SUN Zhong-ren, GAO Tie
With the mature development of multisource remote sensing image fusion technology, how to improve the efficiency and quality of high resolution remote sensing data has become a bottleneck problem for its application effect. Aiming at the problem of low spectral resolution of QucikBird-2 high resolution remote sensing data, combining with ASTER multispectral remote sensing data, three fusion methods, namely PCA fusion, wavelet PCA fusion and IHS fusion based on wavelet are introduced to realize the fusion of multispectral and high resolution images and obtain multispectral high resolution imagery, which enhances the spatial resolution of image and at the same time retains the multispectral information as much as possible. Finally, qualitative and quantitative evaluation is conducted on the results of three fusion methods.
2015 Vol. 24 (5): 489-495 [
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42
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496
APPLICATION OF DEXP INVERSION METHOD IN THE SEARCH FOR KALI SALT
HUAN Heng-fei, JIA Li-guo, GAO Tie, GAO Fei, YANG Jia-jia
In order to verify the effect of DEXP inversion method in the search for kali salt, based on its principle, the method is applied in processing the surveyed Bouguer gravity anomaly data and determine the burial depth of potash deposit, which achieves good results. The results show that the application of DEXP inversion method in determination of burial depth of sources is feasible.
2015 Vol. 24 (5): 496-500 [
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41
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501
CONTENT DETERMINATION OF CERIUM, LANTHANUM, THORIUM AND OTHER ELEMENTS IN MONAZITE WITH SEM-EDS ANALYSIS
YIN Xiao
There are tiny content of fine-grained minerals like monazite and zircon in metamorphic rocks and they can be hardly tested by polarized reflecting microscope identification technology and X-ray diffraction analysis. With the SEM-EDS analysis technology, the main mineral components and element concentration can be determined. With the Casino and Quanta programs, the mass fraction (%) of each element can be calculated based on the element concentration. This study tests the trace minerals of 6 samples by SEM-EDS. The result shows that the main elements are composed of O, Ce, Nd, La, Al, P, Ca, Si, Ag and Th, which is consistent with the composition of monazite. Thus it can be concluded that the 6 samples belong to monazite.
2015 Vol. 24 (5): 501-506 [
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57
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507
APPLICATION OF D-InSAR IN THE LAND SUBSIDENCE MONITORING FOR PANJIN WETLAND
TIAN Hui, SUN Qi-fa, WANG Fu-gang, MA Shi-min, DU Ji-zhong
The two-pass D-InSAR method is adopted for the registration, filtering, flat-earth phase removal, phase unwrapping, differential processing of the SAR data in Panjin wetland, to obtain the vertical deformation map and realize the land subsidence monitoring. By calculation, the subsidence amounts of three subsidence centers, namely Dongguoweichang, Huanxiling and Xibaqianxiang, are -169, -78 and -105 mm, respectively. In respect of subsidence areas, Dongguoweichang (A) is 5.14 km
2
, in oval settlement area with NE-SW trending long axis; Huanxiling (B) is 0.42 km
2
, nearly circular plane shape; Xibaqianxiang (C) is 5.28 km
2
, in oval settlement area with NE-SW trending long axis.
2015 Vol. 24 (5): 507-510 [
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