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2013 Vol.22 Issue.5,
Published 2013-10-31
347
GEOLOGY AND PETROGRAPHY OF THE GARNET GRANITE IN DAQINGSHAN AREA, INNER MONGOLIA
WU Xin-wei, XU Zhong-yuan, LIU Zheng-hong, SONG Hai-feng, CHEN Xiao-feng
The garnet granite in Daqingshan area, Inner Mongolia shows irregular zonal distribution along the structural unconformity between granulite series and khondalite series. Based on field geological survey and petrographical characteristics, the transitional relation between the garnet granite and surrounding rocks can be determined. The metamorphic supracrustal rocks and part of enclosures in the garnet granite can not only be compared with those of periphery similar rocks in lithology, but also show evident anatectic reformation. Existing evidence suggests that the garnet granite should be generally formed by in-situ melting of garnet biotite gneiss of khondalite series, as a product of anatexis, which provides a basis for the evolution of anatexis in this area.
2013 Vol. 22 (5): 347-354,359 [
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355
CHARACTERISTICS AND TECTONIC SETTING OF THE BAOLIGAOMIAO VOLCANIC FORMATION IN NORTHERN ERENHOT-ABAGAQI, INNER MONGOLIA
Baoyinwuliji, ZHAO Wen-tao, BAO Feng-qin
With a systematic study on the basic characteristics, lithogeochemistry and tectonic setting of the volcanic rocks of Baoligaomiao Formation distributed in northern Erenhot-Abagaqi, Inner Mongolia, it is concluded that the volcanic rocks belong to calc-alkaline rock series, formed in synorogenic setting under the control of compression, during the Late Carboniferous orogenic process of intense arc-arc convergence-collision. Due to the oblique convergence effect in the west earlier and east later, the northeast-trending strike slip fault system emerges under the principal compressive stress from northwest to southeast, which provides rising channel and space for the formation of volcanic rocks and leads to strong volcanic eruptions in the extensional tectonic regime of late orogenic stage.
2013 Vol. 22 (5): 355-359 [
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360
ZIRCON U-Pb AGE, GEOCHEMISTRY AND PETROGENESIS OF THE JIANSHETUN VOLCANIC ROCKS IN EASTERN INNER MONGOLIA
BIAN Xiong-fei, LI Yong-Fei, SUN Shou-liang, GAO Xiao-yong
The LA-ICP-MS zircon U-Pb dating for the Jianshetun volcanic rocks in Eastern Inner Mongolia yields an age of Early Triassic(248.4±4.8 Ma). According to the major element compositions, the volcanic rocks, with a high Na
2
O/K
2
O ratio (2.04), A/CNK of 0.81-1.40 and A/NK of 1.48-2.50, should be assigned to acidic-intermediate and intermediate calc-alkaline to high potassium calc-alkaline series. With respect to the features of Sr>300, Yb=1.37-2.91,
δ
Eu=0.62 (average), the rocks can be regarded as adakites, whose original magmas were most likely produced by the partial melting of granulite facies materials in the thickened lower crust. Considering the geochemical characteristics of the simultaneous Jianshetun granites and regional tectonic background, the volcanic rocks of this study should be the product of partial melting of the thickened newborn lower crust after the Late Permian closure of the Paleo-Asian Ocean along the Xar Moron suture zone.
2013 Vol. 22 (5): 360-366 [
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367
ORGANIC GEOCHEMISTRY OF THE SOURCE ROCKS IN UPPER PERMIAN LINXI FORMATION IN JARUD BASIN, INNER MONGOLIA
WANG Jie, LI Wei, CHEN Shu-wang, DING Qiu-hong, ZHANG Jian, SU Fei
A series of thick mudstone of the Upper Permian Linxi Formation, which is a potential layer for hydrocarbon source rock, is widely distributed in the Jarud Basin. Indexes such as organic abundance, type, source and maturity are used to analyze the outcrop samples from Linxi Formation. The testing result shows that the organic abundance of the mudstone is medium to relative-good degree, belonging to medium grade of hydrocarbon source rock, with organic type Ⅲ. The maximum pyrolysis temperature of organic matter varies from 363℃ to 581℃;The vitimite reflectance is distributed from 1.38% to 2.8% with average of 2,01%. The data suggest that the mudstone of Linxi Formation be in high-and overmature stage. The research reveals that the mudstone of Linxi Formation is a kind of favorable hydrocarbon source rock with good exploration prospect for gas resource.
2013 Vol. 22 (5): 367-370 [
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371
GEOLOGICAL CHARACTERISTICS AND PROSPECTING TARGETS OF THE QAGAN OBO Fe-Zn POLYMETALLIC DEPOSIT IN INNER MONGOLIA
CHANG Chun-jiao, CONG Run-xiang, LIU Gui-ge, QI Li-hua, WANG Zhi-hua, WANG Liang, ZHANG Hui-yu, KONG Yuan-yuan
The Qagan Obo Fe-Zn polymetallic deposit tectonically lies in the eastern part of the Early Paleozoic Qagan Obo-Aoyoute-Chaobuleng tectonomagmatic belt. The Middle Ordovician Duobaoshan Formation, serving as the main host, is closely related to the metallogenesis. The skarn zones with Fe-Zn and Mn layers commonly occur at the contact between Qagan Obo quartz diorite stock and the neritic facies sedimentary rocks of Duobaoshan Formation. The Fe-Zn orebodies are mainly hosted by the skarn in stratiform, banded or lenticular shapes. The Qagan Obo quartz diorite stock supplies not only the ore materials, but also the ore-forming fluid and dynamic. The regional NE-striking Qagan Obo-Dongwuqi deep fault controls the occurrences of rock bodies and polymetallic deposits. The secondary NE-and NW-trending fractures control the distribution Fe-Zn orebodies. The favorable areas for seeking Fe-Zn polymetallic deposits are the contact zones between the multi-staged acid-intermediate magmatic intrusions and the neritic facies sedimentary rocks of Middle Ordovician Duobaoshan Formation and the concentrated fissure belts in the wallrocks.
2013 Vol. 22 (5): 371-375 [
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376
METALLOGENESIS AND PROSPECT OF THE EASTERN LIAONING-SOUTHERN JILIN METALLOGENIC PROVINCE
ZHANG Guang-yu, OUYANG Zhao-huo
On the basis of a synthetic analysis of ore-forming conditions and regional mineralization characteristics in the Eastern Liaoning-Southern Jilin metallogenic province, it is proposed that the major target ore deposits are volcanic sedimentary-metamorphic type, marine volcanic exhalative sedimentation-metamorphic hydrothermal type, submarine exhalative sedimentary metamorphic-magmatic hydrothermal reformation type and volcanic hydrothermal sedimentarymetamorphic type. With the study on the geology and metallogeny as well as geophysical and geochemical exploration, 16 prospecting target areas for iron, copper, lead-zinc, gold, silver and boron are located.
2013 Vol. 22 (5): 376-382 [
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383
DEPOSITION RATE AND SEA-LEVEL FLUCTUATIONS OF THE MAJOR ESTUARINE AREAS IN THE COASTAL ZONE OF LIAONING DURING TEN THOUSAND YEARS
BING Zhi-wu, CHEN Xi, ZHAO Xu, ZHAO Yan
Based on the
14
C and OSL dating for cores from four drill holes in the major estuarine areas of the Liaoning coastal zone, the deposition rates of the recent 10 000 years are calculated, with analysis on the fluctuation of the sea level. It is revealed that the average deposition rate of the estuaries is low during a long term. Among them, the Yalu River Plain in the Yellow Sea coast in northeast Liaodong peninsula experienced an erosion environment in early Holocene. The average deposition rate of Yanghe Plain is 1.4 mm/a in Holocene; that of the Lower Liaohe Plain in the north of Liaodong Bay is 1.52 mm/a; while that of the Dalinghe alluvial fan in the Western Liaoning coast, 1.87 mm/a. The Holocene marine bed I or the marine-continental transitional bed represents a process of marine transgression, which corresponds to the Panshan marine transgression in Lower Liaohe Plain. However, the sea-level fluctuations vary in different areas.
2013 Vol. 22 (5): 383-387 [
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388
STUDY ON THE PORPHYRY DEPOSIT SYSTEM
LIU Hong-wei, ZHANG Shan-ming, FENG Gang, ZHANG Jian, LIU Ya-feng
In regional scale, porphyry copper systems have the following characteristics: 1) commonly occurring in belts, with deposits either as clusters or structurally controlled alignments; 2) mainly generated in island arc and continental margin environments, related to compressive or moderate extensional stress; 3) initiated by the invasion of oxidative Ssaturated and metal-rich magma, which provides ore-forming materials; and 4) with the size, grade and type of mineralization strongly influenced by the physical properties and chemical compositions of the host rocks. The depositscale characteristics of porphyry copper systems are as follows: 1) There is a close spatial-temporal and genesis relationship between porphyry copper deposit and porphyry stocks; 2) The volcanic breccia pipes either cut or occur alongside the porphyry copper mineralization in the deep, commonly with high-sulfidation Au mineralization contact zones; 3) The ore-related breccias in the ore-forming system include explosive breccia, intrusive breccia, explosiveintrusion breccia, hydrothermal breccias and hydrothermal pebble veins; 4) From bottom to top, the hydrothermal alterations are in the zonation of early barren sodic-calcic, ore-bearing potassic, chloritization-sericitization, sericitization and advanced argillic alteration; And 5) the lithocap, which is an important indicator for exploration, is a significant component of the hydrothermal-mineralization-alteration system in porphyry copper system.
2013 Vol. 22 (5): 388-396,430 [
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397
DISTRIBUTION OF SIGNIFICANT METAL MINERAL RESOURCES THE IN ADJACENT AREAS OF CHINA, RUSSIA AND MONGOLIA
CHAI Lu, ZHU Qun, ZHOU Yong-heng
With an introduction to the regional geological setting, metallogenic zoning and the significant metal mineral resources in the adjacent areas of China, Russia and Mongolia, the spatial and temporal distribution characteristics in the region are summarized as follows: The zonation of the metal deposits is obvious. The mineralization period is concentrated in Yanshanian. The metallogenesis is mainly related to the collisional orogeny of Mongol-Okhotsk orogenic belt.
2013 Vol. 22 (5): 397-402 [
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403
THE 3D MODELING METHOD BASED ON PROFILES AND ITS APPLICATION IN BENXI, LIAONING PROVINCE
ZHANG Wei, XUE Lin-fu, PENG Chong, CHAI Yuan, CHENG Wei
With the GOCAD software, the 3D modeling method based on profiles (3DMMBOP) is put forward for metallogenic belt modeling. In order to reveal the deep geological situation and concealed iron ores in Benxi area, the 3D geological modeling method is established based on profiles in a total area of 907 km
2
. The obtained 3D subsurface geological structures show developed broad and gentle folds, intense faulting and buried basement up to 4200 m deep. The areas with shallow metamorphic basement have a great potential for iron resources exploration. The practices prove that 3DMMBOP is an effective method for metallogenic belt three-dimensional modeling.
2013 Vol. 22 (5): 403-408 [
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APPLICATION OF X-RAY POWDER DIFFRACTOMETER IN THE IDENTIFICATION AND CLASSIFICATION OF PHYLLITE
CHI Guang-cheng, XIAO Gang, CHEN Ying-li, WU Yue, HU Jian-fei, WANG Hai-jiao, YUE Ming-xin, WANG Xin
Phyllite is traditionally classified and defined based on the microscopic observation of rock structure and mineral composition. Actually, it is quite difficult to distinguish the scaly chlorite from biotite, and microgranular quartz and K-feldspar from plagioclase in the slices of phyllite. In order to accurately identify the scaly and microgranular rockforming minerals and their relative contents in phyllite, the semi-quantitative technique of X-ray powder diffraction is adopted to analyze 19 pieces of phyllite samples. The results show that, by the obvious differences of X-ray diffraction (XRD) peaks between mica, chlorite, quartz, K-feldspar and plagioclase, in combination with the X-ray diffraction spectrum fitting technique, the minerals and their contents can be quickly detected. Practice has proved that the integrated application of field observation, slice identification and X-ray powder diffraction will determine the accurate name of phyllite.
2013 Vol. 22 (5): 409-414,434 [
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415
METADATA CONSTRUCTION FOR THE SPATIAL DATABASE OF 1:200000 REGIONAL GEOLOGIC MAP OF NORTHEAST CHINA
LIU Ying-cai
The metadata of the Spatial Database of 1:200 000 Regional Geologic Map of Northeast China is adopted from the 1:200 000 regional geologic reports and geologic maps of Liaoning, Jilin, Heilongjiang and Inner Mongolia in the database. The metadata construction of the database has been completed, with 201 sheets of maps, including 40 of Liaoning, 31 of Jilin, 61 of Heilongjiang and 69 of Eastern Inner Mongolia, generally covering the Daxinganling metallogenic belt and Eastern Liaoning-Southern Jilin metallogenic belt. This database is now published online for realtime application, with a broad prospect.
2013 Vol. 22 (5): 415-418 [
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419
PREPARATION METHOD OF GEOCHEMICAL REFERENCE MATERIALS
SONG Li-hua, HAO Yuan-fang, YANG Liu, HU Jian-fei
As the metrological standard for component analysis of geological materials, the geochemical reference materials are frequently used and play an increasingly important role in the quality controlling of analytical results, instrument calibration and method evaluation. Preparation and application of the geochemical reference materials is an essential work to promote the development of technology and methods of geological analysis. With a brief introduction to the preparation process and technical method of geochemical reference materials, it is discussed about the standard requirements and technical methods for sample preparation, homogeneity test, stability test and certification.
2013 Vol. 22 (5): 419-421 [
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422
MINERALIZATION AND PROSPECT OF THE SALINE RESOURCES IN HANDANXINGTAI REGION, HEBEI PROVINCE
SUN Fu-hai, KONG Yuan
Based on the exploration data of geology and petroleum, with a comprehensive analysis of the Cenozoic sedimentary basin in Handan-Xingtai region, it is preliminarily concluded that the second, third and fourth members of Shahejie Formation and the upper dolostone of Kongdian Formation of Paleogene are the major hosts for saline resources in the area. According to these mineralizing conditions, the prospective areas are suggested.
2013 Vol. 22 (5): 422-425 [
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426
DIAGENESIS AND PORE EVOLUTION OF THE LIUSHAGANG FORMATION IN WUSHI SAG
LIU Chong, ZHU Ding-jun, SU Wen-hui, CHEN Jin-ding
A detailed study is carried out on the diagenesis and pore evolution with thin section observation, X-ray diffraction, scanning transmission electron microscope and vitrinite reflectance. The results show that the rock type of the 2nd and 3rd members of Liushagang Formation in the Wushi Sag is dominated by quartz sandstone, with minor feldspathic quartz sandstone. The size fraction of grains is moderate to poor. The diagenesis of the sandstone has reached to Stage A of the middle diagenetic period. The pores are mainly primary intergranular and secondary dissolution types. The primary intergranular pores decrease with the compaction and cementation of sandstone, while the secondary pores increase with dissolution, which improve the physical property of reservoir.
2013 Vol. 22 (5): 426-430 [
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431
DISCUSSION ON THE DIGITALIZATION OF PRIMARY GEOLOGICAL DATA
LI Min, JI Hui-ying, LI Xiu-rong
With an introduction to the current situation and problems about the primary geological data of North China, the necessity of digitalization for the primary geological data is analyzed. The detailed procedures of the digitalization for primary geological data are summed up, with effective measures and suggestions for the improvement of public services.
2013 Vol. 22 (5): 431-434 [
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