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2015 Vol.24 Issue.4,
Published 2015-08-31
287
DETERMINATION OF THE GEOLOGICAL AGE OF LITHOSTRATIGRAPHIC TAIYUAN FORMATION IN LIAONING PROVINCE
WANG Hai-peng
With survey on lithology, paleontology and contact relationship of the Taiyuan Formation in three stratigraphic areas, namely Taizihe, Dalian and Western Liaoning, the author thinks that the geological ages of lithostratigraphic Taiyuan Formation vary from place to place in Liaoning Province. The age of Taiyuan Formation in Taizihe area is the Late Carboniferous, without diachronism; whereas that in Dalian and Western Liaoning, is the Late Carboniferous-Early Permian, with apparent diachroneity.
2015 Vol. 24 (4): 287-294 [
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295
SEQUENCE STRATIGRAPHY AND CHARACTERISTICS OF MIDDLE CAMBRIAN IN TAIZIHE AREA, EASTERN LIAONING PROVINCE
WU Zi-jie, PAN Yu-qi, BAO Hong-wei, WANG Hai-peng, LEI Guang-xin, CHENG Pei-qi
Middle Cambrian strata in Taizihe area of Eastern Liaoning Province, including Jianchang Formation and Mantou Formation, belongs to epicontinental deposit. According to the features such as lithological combination, sedimentary cycle and lithofacies, the Middle Cambrian stratum is divided into 3 third-order sequences, including 1 type-Ⅰ and 2 type-Ⅱ sequences, and 30 parasequences are identified. The condensed member is not developed and the sequences are all composed of transgressive system tract and high system tract.
2015 Vol. 24 (4): 295-300 [
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28
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301
DISCUSSION ON THE NEOARCHEAN GEOLOGICAL EVOLUTION IN ANSHAN-BENXI-FUSHUN REGION
TIAN Yi, YU Chao, WANG Guang-wei, DOU Shi-yong, BAO Dong-ming
Anshan-Benxi-Fushun is the main outcropped area and key study area for Archean rocks in China, where the metamorphic plutonic intrusion is dominant while the outcropped metamorphic supracrustal rocks are less than 20% by area. The metamorphic plutonic rocks are emplaced in different periods of the Eoarchean-Neoarchean, with the protolith composed of TTG and CA rock series. The typical metamorphic supracrustal rocks are magnetite quartzite and amphibolite. The protolith formations of the two types of rock experienced continuous temperature reduction and decompression process from granulite through amphibolite to greenschist facies in Archean. According to the outcropping characteristics of Neoarchean rocks, the authors divide the study area into three micro paleo-continent nucleuses, namely Anben, Qingyuan and Liaobei paleo-continent nucleuses. Mesoarchean and Neoarchean are the most important epeirogenetic periods, with the Anben micro paleo-continent nucleus as the earliest accretion center, going through matching and splitting transformation, then forming the current geological structure.
2015 Vol. 24 (4): 301-308 [
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39
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309
GEOLOGY AND REGIONAL TECTONIC EVOLUTION OF MIDDLE JURASSIC ADAKITE IN YIWULYUSHAN, LIAONING PROVINCE
KUAI Bing, WANG Li-xin
The authors confirm the existence of Middle Jurassic adakite which is rich in mafic microgranular enclaves (MMEs) in Yiwulyushan, Liaoning Province. With analysis of the petrological and geochemical characteristics of the rocks, the tectonic evolution process in the region is divided into four phases, of which the tectonic settings are studied based on recent research results.
2015 Vol. 24 (4): 309-316 [
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26
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317
EVENT STRATIGRAPHY OF THE PALEOZOIC ERATHEM IN BENXI-HUANREN REGION, EASTERN LIAONING PROVINCE:Division and Characteristics
WANG Xuan, PAN Yu-qi, WU Zi-jie, BAO Hong-wei
Benxi-Huanren in eastern Liaoning Province, where the Paleozoic strata are well developed, is a typical area for stratigraphic and sedimentological study. Based on the theory and concept of event stratigraphy and division of main geological events, with the 1:50000 regional geological survey and stratigraphic section measurement, the Paleozoic strata in the region is divided into 6 event stratigraphic units, i.e. tectonic uplift, depresion, transgression, hypoxia, windstorm and hot arid, and 8 event clusters. The authors describe each event stratigraphic unit individually, present the concepts of event individual, event cluster, event sediment and event cluster depositional segment, and discuss its correlation with sedimentary environment and sequence stratigraphy.
2015 Vol. 24 (4): 317-324 [
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37
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325
CHARACTERISTICS OF INTRUSIVE ROCKS IN HUAKUNTOUYINGZI VORTEX STRUCTURE IN LIAONING PROVINCE AND ITS RELATION WITH TECTONIC EVOLUTION
PAN Ming-chen, XU Gui-yan, LIU Wen-hai, LIANG You-wei, WANG Fu-jun, LU Hong-feng, HU Hai-yan, LI Hong-mei, SHAO Xue-feng, LIU Shuang
The Huakuntouyingzi intrusive rock, as an important part of the Huakuntouyingzi vortex structure, can be divided into four intrusive bodies, namely, the Early Carboniferous diabase, Early Triassic diorite, Middle Jurassic monzogranite and Early Cretaceous granite porphyry, and the latest invasion of rhyolitic porphyry dyke. The magma of Early Carboniferous diabase originated from the upper mantle; while those of the other rock bodies were derived from the lower crust, with fusion of partial continental crust material. The relation between the intrusive rocks and tectonic evolution is characterized by passive emplacement mechanism.
2015 Vol. 24 (4): 325-331 [
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332
METALLOGENIC MODEL OF GOLD DEPOSIT IN DANDONG-WULONG AREA, LIAONING PROVINCE
CHENG Pei-qi
The lithology of wall rocks of the gold deposits in Wulong-Gulouzi gold perspective area is mainly gneissic granite. The occurrence of massive sulfide vein is strictly controlled by the NNE- and NWW-trending fault structures. The gold deposits are genetically epi-mesothermal fluid filling quartz vein type. In the early stage, diorite magma inflatable diapiric emplacement happens and fills the structural fissures of wall rock to form dioritic porphyrite dyke. In the later, Au fluids fill the revived earlier fissures (filled by dioritic porphyrite) and new structural fissures to form gold-bearing sulfide quartz vein.
2015 Vol. 24 (4): 332-335 [
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41
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336
ELEMENT GEOCHEMISTRY OF QIDASHAN IRON DEPOSIT IN LIAONING PROVINCE
LENG Wen-fang, WANG En-de, WU Yue, LIU Lu-shan, FU Hai-tao, WANG Na
The Qidashan iron deposit is tectonically located in western Liaodong anteklise of North China Platform, with iron ore layers hosted in the Yingtaoyuan Formation of Anshan Group. The ore-bearing formation is sandy mudstonemudstone (Algoma type), with metamorphic facies of greenschist. By study on the REE geochemistry of ores and wall rocks, the REE patterns show enrichment of LREE in the ores with LREE/HREE of 3.43, whereas slight depletion of HREE in the wall rocks with LREE/HREE of 0.97. The primitive mantle-normalized REE spiderdiagram shows weak positive anomalies of Eu (
δ
Eu=1.03-1.50), without anomalies of Ce (
δ
Ce=0.54-1.15) in iron ores, which is consistent with the characteristics of submarine exhalative sedimentation. There is no significant anomalies of Eu (average
δ
Eu 1.16) and Ce (
δ
Ce=0.18-1.01) in the wall rocks. The features above suggest that the iron deposit should be the product of marine chemical deposition in Early Precambrian in the tectonic background of oceanic island arc and provenance type of uncut magmatic arc.
2015 Vol. 24 (4): 336-340 [
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51
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341
DISTRIBUTION AND GENESIS OF HIGH-GRADE IRON ORE IN ANSHAN-BENXI REGION
LIU Lu-shan, FU Hai-tao, LIU Zhong-yuan, LENG Wen-fang, WU Yue
The Anshan type sedimentary-metamorphic iron deposit in China is famous for "being large and poor". However, high-grade iron orebodies are hosted in many deposits in Anshan-Benxi region, among which the rich iron ore resources of Gongchangling deposit exceed one hundred million tons. With study on the distribution regularity and characteristics of typical high-grade iron orebodies, the authors recognize that the rich iron orebodies are formed by regional metamorphic reformation, distributed in the range of 85 km long from west to east and 25 km wide from north to south. The Mesozoic granites may also be involved in the formation of some rich iron orebodies.
2015 Vol. 24 (4): 341-346 [
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347
RESOURCE EVALUATION OF MAGNESITE IN EASTERN LIAONING PROVINCE WITH PROSPECTING PROBABILITY-GEOCHEMICAL BLOCK METHOD
LIU Chang-chun
Magnesite, as a very important mineral in Liaoning Province, is concentrated in the Liaoning-Jilin rift and characterized by large scale, distinct geochemical characteristics features and anomalies and good metallogenic conditions. Based on the favorable geological conditions, the author makes full use of various geological and geochemical prospecting indicators and prospecting probability-geochemical block method to make mineral prediction and evaluation of magnesite in the Liaoning-Jilin rift, divides geochemical block of magnesite and presents geochemical block pedigree with the theoretical basis of geochemical block, and finally delineates 11 prospective areas, including 2 grade Ⅰ, 7 grade Ⅱ and 3 grade Ⅲ prospects, with predicted resources of 11.41268 billion tons.
2015 Vol. 24 (4): 347-352 [
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31
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353
GEOCHEMISTRY AND GENESIS OF THE METAMORPHIC ROCKS OF LIAOHE GROUP IN HUANGQI AREA, LIAONING PROVINCE
YANG Zhong-jie, ZHANG Jing, LIU Chang-chun, YANG Xin-yu, WANG Cheng-long, JIANG Chun-yu
Huangqi area is tectonically located in the southeastern end of Yingkou-Kuandian anteclise of Jiao-Liao platform uprise in the east of Sino-Korean paraplatform. The study area belongs to the east of Early Precambrian tectonic division of Eastern Liaoning, where Mesozoic magmatic complex and Paleoproterozoic magmatite and strata occur and Paleoproterozoic Liaohe Group is widely developed. Metamorphic rocks are mainly schist, granulite, leucoleptite, arkose quartzite, calcsilicate rock and marble. The petrochemical characteristics of the metamorphic rocks are as follows: 1)The average content of SiO
2
in silicate rocks is 47.32%-78.6%, generally K
2
O>Na
2
; 2)Carbonate rocks are generally rich in Ca and Mg, with CaO>MgO. The metamorphic rocks in Liaohe Group take very similar trace element content, high content of F and Rb and relatively high Clarke values of concentration. The REE average ΣREE of the metamorphic rocks is 205.9×10
-6
, with average LREE/HREE of 12.8 and
δ
Eu of 0.56. The REE distribution pattern is gently gradient to the right, with better differentiation of LREE than that of HREE, enrichment in LREEs and negative Eu and slightly negative Ce anomalies. Combining with the characteristics of protolith formation of Liaohe Group regionally, it is concluded that the study area was a geosyncline tectonic setting in Paleoproterozoic Era, reflecting that Liaohe Group strata formed a complete volcanicsedimentary formation series on the whole.
2015 Vol. 24 (4): 353-361 [
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362
COMPARISON ON THE METALLOGENIC GEOLOGICAL CONDITIONS OF POLYMETALLIC DEPOSITS BETWEEN NORTHERN KOREAN PENINSULA AND EASTERN LIAONING PROVINCE
LI Hong-mei, SHAO Xue-feng
Northern Korean Peninsula and the Eastern Liaoning share almost the same metallogenic horizons and orecontrolling structure. However, the Jiande lead-zinc deposit and Yunshan and Dayudong gold deposits in DPRK are all large or even super-large deposits. There is great difference in mineral resources amount/reserves between Eastern Liaoning region and the North Korean side. With comparative study on typical gold, copper and lead-zinc polymetallic deposits, metallogenic geological background, mineral type and genesis in the two regions, the metallogenic prospective areas in Eastern Liaoning region are recognized and new breakthrough in prospecting in the region is expected.
2015 Vol. 24 (4): 362-364 [
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45
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365
COASTLINE VARIATION MONITORING AND ANALYSIS OF NORTHERN LIAODONG BAY BASED ON MULTI-SOURCE REMOTE SENSING DATA
WANG Da-peng, BING Zhi-wu, LI Yan-bin, CHEN Xi, YU Lang
The paper analyzes the regional change rule and trend in the northern Liaodong Bay from the two aspects of length and curvature with RS technology. Using multi-source RS data such as MSS/TM/ETM+ series data of US Landsat, French SPOT/4-5 series data and China Resources Satellite ZY-1 02C data, combining with the methods of artificial visual interpretation and computer automatic information extraction, the coastal changes in northern Liaodong Bay during 1973-2012 are monitored. The study shows that the length and curvature of coastline in northern Liaodong Bay are both increasing, especially after 1997 when they increase rapidly. The middle section of the coastline has the fastest increasing speed, followed by the west section and the east section. The main driving force for the change is human factors.
2015 Vol. 24 (4): 365-368 [
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44
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369
MAGNETIC ANOMALY AND METALLOGENIC PREDICTION IN THE XIN BARAG YOUQI AREA, INNER MONGOLIA
ZHOU Duo, DONG Zai-ming, CHEN An-xia
With the 1:50000 high-accuracy ground magnetic prospecting, the authors analyze the distributing features of local magnetic anomaly in the survey area and regional magnetic anomaly, summarize the magnetic field features of major geological units, delineate 14 magnetic anomalies and interpret 16 fault structures and 7 volcanic conduits. Combining with the geological conditions, the article comprehensively interprets the 14 magnetic anomalies and infers that C1, C2 and C13 magnetic anomalies are favorable targets for polymetallic ore prospecting. The C4, C9, C10, C12 and C14 magnetic anomalies have good geological conditions for formation of polymetallic ores.
2015 Vol. 24 (4): 369-372,324 [
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43
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373
STUDY ON THE SIMULATION OF MAGNETOTELLURIC STATIC EFFECT
SHI Bin, HUAN Heng-Fei, GAO Tie, ZHAO Yuan-dong
With analysis on the effect of parameters such as model width, thickness, depth and resistivity on apparent resistivity and apparent phase by numerical simulation, it is found that the TM mode is seriously affected by static effect. The static distortion caused by anomalous bodies increases while the burial depth becomes shallow. The distortion caused by surface anomaly is particularly serious. The greater the resistivity difference between the anomaly and wall rock is, the more obvious its static effect is. Compared to thickness, the change of anomaly width has a greater effect on apparent resistivity. The correlation function between the parameters and apparent resistivity based on curve fitting is used to estimate the influence of anomalies on resistivity for the purpose of correction.
2015 Vol. 24 (4): 373-377 [
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38
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378
APPLICATION OF GOCAD THREE-DIMENSIONAL VISUALIZATION IN DEEP GEOLOGICAL SURVEY
ZHAO Wen-ju, WANG Ying, TENG Shou-ren, ZHOU Jun-peng
By introducing the 3D geological modeling with principle and method of application of GOCAD software, taking deep geological survey in Benxi region for example, the authors analyze the stratum, structure and rock mass and establish 3D models. Each geological 3D model can reflect the distribution pattern of geological bodies in 3D space better, meanwhile the 3D shape of required target geological body can be established according to different research objects. Deep geology 3D modeling relies not only on surface information, but also the technical constraint of drilling and geophysical data to improve the model, which would conform to geological regularity and truly reflect geological phenomena, and could help geologists recognize geological occurrence and improve work efficiency in the future.
2015 Vol. 24 (4): 378-382,346 [
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383
APPLICATION OF 1:50000 THREE-DIMENSIONAL GEOLOGICAL MAPPING METHOD IN BENXI ORE CONCENTRATION AREA
TENG Shou-ren, DONG Zhe, WANG Ying, LI Wei, ZHAO Wen-ju, ZHOU Jun-peng
The 3D geological mapping in ore concentration areas adopts the 1:50000 survey scale and submits surface and deep geological maps with certain precision, which provides geological basis for the delineation of main geological targets like ore-bearing formation and ore-controlling structure. With the 3D geological mapping work in Benxi ore concentration area, the authors think that the structural mapping is the basis for 3D geological mapping. The authors also propose the 3D geological modeling method of "grading and blocking", and summarize the 3D geological mapping method and technique process in ore concentration areas.
2015 Vol. 24 (4): 383-387,361 [
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388
EVALUATION OF SHALLOW GROUNDWATER POLLUTION IN LIAOYANG-ANSHAN SECTION OF LOWER LIAOHE RIVER PLAIN
ZHAO Yan
With the expanded city scale, accelerated urbanization and improved industrialization, regional surface water and groundwater are polluted in varying degrees and freshwater resources for human survival is threatened. Since 1990s, China has focused on researches about agricultural pollution and organic contamination. Considering the situation in the study area, the evaluation mainly adopts single factor pollution index and comprehensive pollution index methods. After a comprehensive analysis on the various methods of groundwater evaluation, the evaluation selects single pollution index and comprehensive evaluation index of groundwater pollution for the region. The author collects 110 groups of shallow groundwater samples in the study area, and tests 35 indicators for each sample. The evaluation results show that 67.4% of the shallow groundwater are subject to contamination in different degrees, which basically reflects groundwater pollution status and provides the basis for targeted treatment in the study area.
2015 Vol. 24 (4): 388-393 [
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394
ASSESSMENT OF GROUNDWATER VULNERABILITY IN THE LOWER LIAOHE RIVER PLAIN WITH DRASTIC METHOD BASED ON GIS
ZHAO Xu, CHEN Xi
The authors evaluate the groundwater vulnerability in the Lower Liaohe River Plain with GIS-based DRASTIC method, analyze 7 major hydrogeological parameters that affect the vulnerability, and evaluate each factor respectively. Using merger analysis of spatial analysis function in GIS, the classification graphs for each single index are integrated to generate zone files and vulnerability map. The result shows that the areas with poor antifouling property are mainly distributed in the valleys of Lower Liaohe River Plain, with an area of 2993.51 km
2
, accounting for 12.78% of the total. The assessment result is beneficial to the rational utilization of land and effective protection of groundwater resources.
2015 Vol. 24 (4): 394-398 [
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