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2017 Vol.26 Issue.3,
Published 2017-06-30
221
THE EARLY JURASSIC ADAKITE IN SUNWU AREA, NORTHERN XIAOXINGANLING MOUNTAINS: Genetic Connection to the Activation of Nenjiang-Heihe Tectonic Belt
ZHENG Tao, JIN Zhe-yan, WANG Xing, LIU Xu-guang, SU Hang
The quartz monzodiorite in Sunwu area, Northern Xiaoxinganling Mountains, is systematically studied on chronology and geochemistry. The LA-ICP-MS zircon dating yields the emplacement age of 174.9±1.2 Ma (Early Jurassic). Petrological and geochemical study indicates that the rock contains high SiO
2
and Al
2
O
3
but low MgO, plus relatively enrichment of Na (Na
2
O/K
2
O in 1.51-2.53). It is high in Sr (>400×10
-6
), low in Y (≤ 18×10
-6
) and Yb (≤ 1.9×10
-6
), with notable fractionation between LREE and HREE, (La/Yb)
N
varying between 12.32 and 22.45. Besides, there is not significant negative Eu anomaly in the chondrite-normalized REE pattern. All of the geochemical characteristics above suggest that the quartz monzodiorite in Sunwu area belongs to adakite. The rock is originated from the partially melted thickened lower crust, and subject to the contamination of mantle material. Integrating with regional geology, it is concluded that the rock is formed under the tectonic system of Mongol-Okhotsk orogenic belt, affected by the activation of Nenjiang-Heihe tectonic belt. This area was in an intracontinental extension during the Early Jurassic Epoch.
2017 Vol. 26 (3): 221-228,233 [
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229
DIVISION AND CHARACTERISTICS OF THE GEOTECTONIC UNITS OF YUNLING EPICONTINENTAL ARC IN NORTHWEST YUNNAN
WANG Xue-wu, LIU Feng-xiang, LI Xin-ren, YAN Cheng-min, ZHOU Xi-lin, WANG Chang-bing
With field survey and data processing, the structural characteristics of the Yunling epicontinental arc in Northwest Yunnan are clarified. This region is divided into 6 four-grade tectonic units, i.e. Xuelongshan Rock Group (Pt
1
Xl), Deqing Blocks (Pz
1
), Pantiange acidic volcanic magmatic arc (T
2
), Gongnong inter-arc basin (T
2
), Cuiyibi intermediate-basic volcanic magmatic arc(T
1-2
), and Ludian volcanic arc-syn-collisional granite(T). The former two units belong to the basements of island arcs; while latter four, the main bodies. The rock associations and deformation-metamorphism of each unit are various obviously. The main bodies of island arcs were formed from Early Triassic to early Late Triassic, as a product of the westward subduction and collisional orogeny of Jinshajiang ocean basin. The main bodies of island arcs are covered by Upper Triassic strata in angular unconformity.
2017 Vol. 26 (3): 229-233 [
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234
ZIRCON U-Pb AGES AND GEOCHEMISTRY OF MIAROLITIC GRANITES IN JIQINHE LINCHANG AREA, INNER MONGOLIA
WU Xin-wei, LI Shi-chao, JIANG Bin, ZHANG Yu-jin, GUO Wei, CUI Tian-ri, LI Wei, SI Qiu-liang, LI Lin-chuan
With study on the geochemistry and zircon U-Pb isotopic geochronology of the miarolitic granites in middle Daxinganling Mountains, the age, petrogenesis and tectonic implication are discussed. The zircons from the miarolitic granites show oscillatory growth zonation and high Th/U ratios, indicating a magmatic origin. The LA-ICP-MS U-Pb age of 113.1~11.1 Ma suggests that the rock was formed in the late stage of Early Cretaceous. The granites are characterized by high SiO
2
and rich alkali, with negative Eu anomaly and weak peraluminous. The trace elements are enriched in Rb, Th, La, Zr and Hf and depleted in Ba, Sr, P and Ti. It is concluded that the miarolitic granites belong to highly fractionated I-type, formed in a post-collisional extensional setting after the convergence of North China, Siberian, North American and Pacific plates.
2017 Vol. 26 (3): 234-244,309 [
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245
ZIRCON U-Pb SHRIMP AGE OF THE DAPU INTRUSIVE ROCK IN FENGCHENG, LIAONING PROVINCE
AO Guang
The Dapu intrusive rock in Fengcheng, Liaoning Province, is composed of granodiorite, medium-fine-grained granite and medium-fine-grained porphyraceous granite. The SHRIMP age of the medium-fine-grained granite is 126.2 Ma, corresponding to Early Cretaceous.
2017 Vol. 26 (3): 245-247 [
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248
GEOLOGICAL CHARACTERISTICS AND PROSPECTING GUIDE OF THE YANGSHUGOU GOLD DEPOSIT IN EASTERN KUNLUN MOUNTAINS
TIAN Yong-ge, CHEN Bing-fang, HAN Xiao-long, LA Pin-xian
The Yangshugou gold deposit is situated in the east section of the Indosinian Kalike-Xiangride Zu-Pb-Zn-Fe-graphite (-Cu-RE-REE) mineralization belt, Eastern Kunlun metallogenic province. The orebodies are strictly controlled by the E-W-and NE-trending fault structures. The gold deposit is of structural altered rock type, with metallogenic epoch of Early Indosinian. The deep part of existed ore belts and the southeast part of the orefield where faults are developed are favorable areas for prospecting. Further exploration should focus on the ore-bearing fracture zones, with engineering and geochemical survey in the southeast and deep of the orefield, to find more gold orebodies.
2017 Vol. 26 (3): 248-252 [
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253
GEOCHEMICAL CHARACTERISTICS AND GEOLOGICAL IMPLICATION OF THE ORE-FORMING ROCKS OF THE CHANGANPU Mo (-Cu) DEPOSIT IN JILIN PROVINCE
ZHANG Di, JU Nan, ZHANG Sen, KOU Lin-lin, GU Yu-chao
To ascertain the metallogenic characteristics and regularity of the typical porphyry deposits in central Jilin Province, this paper studies the geological characteristics and ore-forming intrusive rocks of the Changanpu Cu-Mo deposit. The geochemical compositions of the metallogenic biotite monzogranite show the characteristics of high silicon, potassium and Al
2
O
3
, low total alkali, TiO
2
, Y and Yb contents, with relative enrichment in LILE and LREE, depletion in HFSE and HREE, negative Eu anomaly and high (La/Yb)
N
value. Two unaltered samples of biotite monzogranite show relatively low (Rb/La)
N
values. The characteristics of the rock bodies are similar to those of the island arc calc-alkaline igneous rocks in Northeast China.
2017 Vol. 26 (3): 253-259 [
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260
STRUCTURAL CONTROLLING CHARACTERISTICS AND PROSPECTING GUIDE OF THE JINNIUCHANG LEAD-ZINC DEPOSIT IN HUIZE COUNTY, YUNNAN PROVINCE
HONG Jian-lei, CHENG Yun-mao, FAN Liang-jun, SU Chang-xue
The orebodies in the Jinniuchang Pb-Zn deposit occur in the NWW-trending plumose fractures. Study shows that the Pingqing anticline, which is the results of regional NW-SE structural stress, serves as the main ore-controlling structure. The NE-trending Guancangqing reverse fault is the passage-way for ore fluid. The secondary NWW-trending tenso-shearing fault is the main host structure. The orebodies are obviously controlled by structures in the orefield, therefore the deep and surrounding areas are prospective for ore-searching.
2017 Vol. 26 (3): 260-264 [
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265
CHARACTERISTICS AND ORE-CONTROLLING FACTORS OF THE SANDSTONE TYPE OF URANIUM MINERALIZATION IN JIANPING COUNTY, LIAONING PROVINCE
CUI Jia-rui, LUO Min
With analysis on the distribution characteristics of the sandstone type of uranium deposits in Heishui area, Liaoning Province, on the basis of evaluation for the ore-controlling factors, such as uranium source, sand body, sedimentary environment, organic matter, geological structure and oxidation zone front, it is concluded that the uranium mineralization in this area is controlled mainly by fault, oxidation front and sub-sags.
2017 Vol. 26 (3): 265-267 [
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268
DISCOVERY OF THE SOURE ROCK FROM UPPER PERMAIN LINXI FORMATION IN TUQUAN BASIN, INNER MONGOLIA
SU fei, LI Zhen, ZHANG Jian, TANG You-jun, ZHANG Hai-hua
A suit of thick grayish-black mudstone is intersected in the TD2 well in the southern boundary of Tuquan Basin. Spores and pollen fossils of 26 species in 19 genera, including Klausipollenites schaubergeri et al., which indicate an age of Late Permian, are found in the mudstone. Comparison of biostratigraphy and lithostratigraphy confirms that the strata belong to Upper Permian Linxi Formation. Analysis on the abundance, type and maturity of organic matter shows a great hydrocarbon-generating potential of the dark mudstone from TD2. The organic matter abundance is medium-good, belonging to Type Ⅱ
1
, in overmature stage. This result suggests that the source rock of Linxi Formation in Tuquan Basin is promising for shale gas.
2017 Vol. 26 (3): 268-274 [
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275
AGE ASSIGNMENT OF THE MESOZOIC SOURCE ROCK IN LABUDALIN BASIN, NORTHERN DAXINGANLING MOUNTAINS
ZONG Wen-ming, ZHANG Hai-hua, SUN Lei, BIAN Xiong-fei, ZHANG Jian, YAO Yu-lai
The thick Mesozoic mudstones are well developed in the Labudalin Basin. The strata with characters of hydrocarbon source rock mainly occur in the middle and lower part of the 1st Member, Shangkuli Formation. A section of the 1st Member of Shangkuli Formation was surveyed at 491 km of the Labudalin-Xiakuli highway, in which tuff was found below thick muddy shale. LA-ICP-MS dating for the tuff sample yields an age of 156.7±1.8 Ma(MSWD=2.0), indicating that the source rocks were formed in Late Jurassic. Therefore it is assigned to Manketouebo Formation. This result adds a dating datum to the Mesozoic chronostratigraphic study in northern Daxinganling Mountains, and provides basic information for source rock strata searching in the volcanic rock-covered regions as well.
2017 Vol. 26 (3): 275-280 [
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281
CONNECTIVITY OF THE JURASSIC SKELETAL SAND BODIES IN THE WEST OF CHEPAIZI UPLIFT, JUNGGAR BASIN
WU Kong-you, LI Jing, TAN Xin-cheng
As an important component of the oil and gas transporting system, skeletal sand body controls the lateral migration and distribution of oil and gas in space. The effective connection is usually affected by the development of faults in the sand bodies as well as the microscopic heterogeneity of the sand bodies. By single well analysis for the main wells in the western area of the Chepaizi uplift in Junggar Basin, on the basis of regional stratigraphic framework and sedimentary facies, the Jurassic skeletal sand bodies are identified. With drawing of connection-well sections and planar distribution contour maps of skeletal sand bodies, the macro connectivity of the skeletal sand bodies is analyzing. Based on the connectivity research of porosity and permeability, with systematic sampling from sand bodies of each layer, the microscopic connectivity is qualitatively described. With geological statistics, the microscopic connectivity is quantitatively evaluated. Therefore, the skeletal sand bodies of Jurassic Toutunhe Formation and Badaowan Formation are comprehensively evaluated from three aspects, i.e. profile, plane and microcosmic view. The results indicate that the connectivity of skeletal sand bodies in the strata of J
2
t
3
and J
1
b
3
is relatively well.
2017 Vol. 26 (3): 281-289 [
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290
STUDY ON THE PRESENT STATUS AND CHANGING REGULARITY OF THE GROUNDWATER IN LIAOHE DELTA
TIAN Hui, JIN Hong-tao, SUN Qi-fa, LIANG Xiu-juan, MA Shi-min, DU Ji-zhong, LI Xu-guang, WANG Xiao-guang
The dynamic changes of the Quaternary pore groundwater quality in the Liaohe Delta are obtained from 10 monitoring sites for three years. The result shows that the mineralized degree of the groundwater is generally high, ranging from 1 to 31 g/L. In the western piedmont plain, the water quality is good, with low salinity. While in the area of southern coastal low plain, the groundwater is brined, with salinity between 12 and 31 g/L. The mineralized degree of groundwater in the east and north alluvial plain ranges from 1 to 3 g/L, as brackish water. In respect to the groundwater chemistry type, the HCO
3
-Na type is mainly distributed in the western piedmont plain; the Cl-Na type, in the southern low-lying coastal areas; the Cl-NaoCa type, in alluvial plains in the north and east; while the HCO
3
·Cl-Na type, in the northeast alluvial plain. The groundwater quality in the sloping piedmont plain is in good status, with rare changes in most areas. In the southern low plain, the contents of Cl
-
, SO
4
2-
and Na
+
as well as salinity keep increasing. The distribution of this type of water is spreading to the surrounding areas. The groundwater components and salinities in the northern alluvial plain fluctuate slightly, with little changes and becoming stable.
2017 Vol. 26 (3): 290-295 [
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296
POTENTIAL ASSESSMENT AND ENVIRONMENTAL BENEFIT ANALYSIS OF SHALLOW GEOTHERMAL ENERGY IN THE URBAN PLANNING AREA OF XUZHOU, JIANGSU PROVINCE
LIU Ai-bin, ZHAI Ru-wei, JING Jia-jun, TAO Wen-jie
Shallow geotherm is a kind of clean, safe and renewable energy. The urban planning area of Xuzhou City, Jiangsu Province, covers a total area of 3157km
2
, including 641km
2
of downtown area. Based on the hydrogeological and engineering geological drilling, thermal property test and thermal response test in the planning area, this paper recognizes the geological background, forming conditions, distribution and geothermal field characteristics, and divides the suitability zones for exploitation and utilization of shallow geothermal energy, then evaluates the resources potential and analyzes the environmental benefits. The results show that the energy saving and pollution reduction effect is considerable.
2017 Vol. 26 (3): 296-302 [
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303
CHARACTERISTICS OF LANDSLIDE DISASTER IN WENZHOU DURING TYPHOON SOUDELOR AND ANALYSIS OF EARLY WARNING RESULTS
ZHOU Ming-lang
The early-warning for geological hazard of landslide in Wenzhou takes village as unit, which is advantageous for high refinement and clear targets. Based on such principle, the early-warning and forecast system plays a significant role in prevention and control of geological hazards for Wenzhou government. Especially during No. 13 typhoon of Soudelor in the year of 2015, the early-warning for landslide in Wenzhou got a high success rate, when the city successfully prevented 6 incidents and avoided 95 deaths and 400 000 RMB loss of property. It is the most effective case of prevention and control of geological hazards in Wenzhou during the 12th Five-Year Plan.
2017 Vol. 26 (3): 303-309 [
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310
GEOPHYSICAL PROSPECTING EFFECT IN THE GRAPHITE-BEARING STRATA IN EASTERN LIAONING: A Case Study of the Diaoyutai Gold-Silver Deposit
LI Shu-jun, SUN Gang, ZHANG Guo, WANG Sheng-zhi, XU Hao
Due to the graphite contained in the Gaojiayu Formation in Eastern Liaoning area, the anomaly value of high polarizability is often higher than that of ore-induced anomalies, while that of low resistance is commonly lower. That seriously affects the prospecting results of geophysical methods. In this paper, the exploration in Diaoyutai Au-Ag deposit is analyzed as an example. On the basis of the stratigraphic and lithologic structure, metallogenic geological conditions and ore-controlling and ore-host structures, the electrical properties of rocks and ores are measured. With IP intermediate gradient and AMT combined method, the abnormal response model is established for the graphite-bearing strata, by which the ore-induced anomalies are correctly identified and classified. The verification drilling shows a good result.
2017 Vol. 26 (3): 310-316 [
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317
SOME UNDERSTANDINGS ABOUT GEOPHYSICAL DATA PROCESSING AND INTERPRETATION
JIANG Li-li
This is a learning note and understanding of the Seminar of Old Mine Prospecting Technology. With study and exchanges in the lectures on the present situation and application of geophysical exploration technology, the author summarizes a few issues on geophysical data processing and interpretation.
2017 Vol. 26 (3): 317-322 [
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323
THE APPLICATION AND RESEARCH OF X-RAY POWDER DIFFRACTION MATRIX FLUSHING METHOD IN QUANTITATIVE ANALYSIS
WU Yue, LIU Xin, ZHANG Bo, LIU Qi
In order to eliminate the influence of preferential orientation of layered silicate minerals on the detection results, matrix flushing method is adopted in X-ray powder diffraction quantitative analysis. Corundum is added as a flushing agent. Pure samples of talc and chlorite are used as references, with a ratio of 1:1 to the corundum. The reference diffraction intensities of corundum, talc and chlorite are measured to calculate the reference strength of talc and chlorite by the reference strength formula. Then the corundum and the definite sample (talc and chlorite mixture) are prepared in the ratio of 1:1 to test the main diffraction peak intensity values of corundum, talc and chlorite. Discarding discrete data, the contents of talc and chlorite are 81.5% and 14.6%, respectively. By EVA semi-quantitative analysis, the contents of talc and chlorite are 92.9% and 5.8%, respectively. The content of chlorite in the definite sample is about 13%, which is close to the definite value of chlorite by the matrix flushing method, but with great difference to that by semi-quantitative analysis. The results show that the analysis of matrix silicate mineral content in the mixture phase by matrix washing is accurate.
2017 Vol. 26 (3): 323-328 [
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329
NATIONAL BASIC GEOLOGICAL INFORMATION CONSTRUCTION IN BIG DATA ERA
LI Min, FU Jie, CHEN An-shu, LI Lei, PENG Li-na
Big data, as a result of new generation of information technology, is an application-driven service field, with unlimited potential. In the environment of big data, the information construction of National Basic Geological Database should focus on the information service value, with the thought of big data, to explore the big data mining and visualization technology, promote the information value, and achieve the maximum value of data. In this paper, a technology scheme for the integration of National Basic Geological Database is proposed on the basis of metadata, database and data warehouse technologies.
2017 Vol. 26 (3): 329-332 [
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