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2011 Vol.20 Issue.6,Published 2011-12-31
401 METALLOGENY OF THE TECTONOMAGMATIC EMPLACING CONTACT STRCTURAL SYSTEMS OF THE METALLOGENIC BELT IN MIDDLE AND LOWER REACHES OF YANGTZE
PEI Rong-fu, LI Jin-wen, WANG Yong-lei, WANG Hao-lin
With discussion on the different contact structural systems of tectonomagmatic emplacement, the metallogeny in the Middle and Lower Reaches of Yangtze is studied. This metallogenic province belongs to the Yangtze marginal tectonic region of South China ancient continental marginal tectonic belt. The tectonomagmatic emplacement is in three steps: 1) forming of the tectonomagma in the deep of crust; 2) dynamic process for the initiative emplacement of magma; and 3) forming of metallogenic sites with different types of emplacing contact structural systems in supracrust of the earth. With two examples of Daye iron deposit and Tongling copper deposit, the authors introduce the roof-foundering contact structure system, which is formed by the initiative tectonomagmatic emplacement, and roof-pendent emplaced above the country rock to form the hinged ore-controlling structures in different depths. The concept of tectonomagmatic emplacing contact structure is a new understanding for the prospecting idea of "digging deeper".
2011 Vol. 20 (6): 401-412 [Abstract] ( 31 ) [HTML 1KB] [ PDF 2502KB] ( 227 )
413 ENDING OF THE MOUNTAIN-BUILDING MOVEMENT OF XING'AN-MONGOLIAN-JI-HEI OROGENIC BELT IN NORTHEAST CHINA: Evidence from Late Triassic molasse(geotectoinc phase)
XIN Yu-lian, REN Jun-li, PENG Yu-jing, SUN Xi-qing
The Late Triassic molasse formations are widely distributed in Xing'an-Mongolian-Ji-Hei orogenic belt in Northeast China. Three of them are the most representative:1) The Dajianggang formation in Shuangyan basin in the orogenic belt, with coarse terrestrial fragments more than 400 m thick in the bottom, and coal-bearing sediment containing Drepanzamites-Glossophyllum in the top. 2) The Xiaoyingzi formation in Baishuitan basin on the epicontinental orogenic belt of North China Landmass, with conglomerate over 351 m thick in lower member, and fine terrestrial fragment sediment in upper, with interbeds of carbonaceous siltstone and fossils of Cycadocarpidium? sp. Uniohuag bogouensis? 3) The Xiaohekou formation in Shiren basin on North China Landmass, with the Hongshilazi conglomerate up to 570 m thick in the lower member, and the upper coal-bearing Beishan member, containing Danaeopsis-Glossophyllum. These molasses formations contact the underlying Early/Middle Triassic or older strata with angular unconformity. Those thoroughly prove that the mountain-building movement of Xinmeng-Jihei orogenic belt was completed between Early/Middle and Late Triassic, which means it ended in Early Indosinian period.
2011 Vol. 20 (6): 413-419 [Abstract] ( 35 ) [HTML 1KB] [ PDF 837KB] ( 199 )
420 THE PALEOZOIC-EARLY MESOZOIC IGNEOUS ROCKS IN THE EAST SECTION OF XING'AN-MONGOLIAN OROGENIC BELT: Tectonic assemblage, division of tectonomagmatic stages and tectonic evolution
SHEN Long, LI Ti, ZHAO Han-dong
Based on the 1:50000 and 1:250000 regional geological survey in Jiayin, Yichun, Hegang, Jixi and Mudanjiang areas in recent years, with the concept of tectonic assemblage of igneous rocks, a preliminary plan on the division of Paleozoic tectonomagmatic stage is put forward, according to the zircon U-Pb age of the intrusive rocks. The igneous rocks that are related to oceanic crust subduction are divided into five stages, which are Caledonian Early Cambrian, Early-Middle Ordovician, Middle Silurian, Variscan Late Carboniferous and Late Permian. The igneous rocks that are related to continental collision is divided into two stages:Caledonian Early Cambrian and Variscan Middle Permian. The postorogenic A-type granite is recognized as two stages. On this basis, the Caledonian tectonomagmatic stage and Middle Variscan-Indosinian tectonomagmatic stage are set up. The point, which is different from the traditional view, will provide a new access to understand the tectonic evolution of this region.
2011 Vol. 20 (6): 420-425 [Abstract] ( 37 ) [HTML 1KB] [ PDF 682KB] ( 155 )
426 GEOLOGICAL FEATURES AND PROSPECTING ORIENTATION OF THE WEIZIGOU GOLD DEPOSIT IN HEILONGJIANG PROVINCE
ZHANG Yong, LIAN Yong-lao, JIN E-mu
The Weizigou gold deposit, occurring in the ancient metamorphic rocks of Jiamushi Uplift, Ji-Hei Geosynclinal System, is a migmatized hydrothermal gold deposit. Study on the geological features of the deposit, with analysis of the source of ore-forming material, type and genesis, shows that the deposit is mainly controlled by the NE-and NNE-trending faults in the region. The metallogenic substance is derived mainly from the Paleoproterozoic Jiantang formation and Liumao formation. On this basis, the metallogenic mechanism is discussed. The metallogenesis in the orefield is predicted. Then, the prospecting direction is pointed out.
2011 Vol. 20 (6): 426-429 [Abstract] ( 42 ) [HTML 1KB] [ PDF 325KB] ( 205 )
430 CHARACTERISTICS AND DIVISION OF THE NANHAU SYSTEM IN LIAONING, CHINA
QU Hong-xiang, BAO Qing-zhong, DONG Wan-de, LI Yan, QU Rou-da, HAO Ming
The Nanhau System, previously known as Hanhua Ice Age, is characterized by the broad occurrence of glacial actions. However, the glacial sedimentation has not found yet in the Nanhua System in Liaoning Province. In contrast, numerous macro algae fossils are developed in the Nanhua System in Liaoning, showing a warm and humid condition of ancient climate. The Pre-Cambrian glacial activities in the rest of the world occurred all in the regions with low paleolatitude. According to the paleomagnetic data, the Nanhua System in Liaoning is distributed in the areas with medium and high paleolatitude. Therefore, the Nanhua System in Liaoning would not produce glacial rock. The "warm type Nanhua System" is developed in Liaoning. This conclusion will provide a new idea for the division and correlation of the Nanhua System in China.
2011 Vol. 20 (6): 430-433 [Abstract] ( 28 ) [HTML 1KB] [ PDF 650KB] ( 188 )
434 STUDY ON THE ORE DRESSING EXPERIMENT OF THE WEILASITUO ZINC-COPPER DEPOSIT IN INNER MONGOLIA
CHANG Guo-xiong, LIU Hong-wei, GUO Yi-ping
The Weilasituo polymetal deposit in Inner Mongolia consists of various useful elements, of which Cu, Pb, Zn, As, Ag, W, Co etc. are valuable for comprehensive utilization. The ores belong to refractory type. With the technological processes of all-flotation for Cu-Pb-successive flotation for Zn-As(-Co)-re-flotation for W-repeated flotation(by shaking table) for W, the ore dressing conditions are tested on the pH value, types and amounts of agents. An ideal ore dressing result is achieved, which provides a technological support for the production of mine.
2011 Vol. 20 (6): 434-439 [Abstract] ( 29 ) [HTML 1KB] [ PDF 816KB] ( 201 )
440 CHARACTERISTICS AND TECTONIC SETTING OF LATE PALEOZOIC PLUTONS IN THE SOUTH OF WESTERN JUNGGAR
DANG Fei-peng, WANG Ju-li, YANG Meng, SONG Zi-sheng
Abundant Late Paleozoic granitoid, which emplaced during Early Carboniferous Visean to Early Permian Artinskian with zircon U-Pb ages ranging from 337 to 276 Ma, is distributed along both sides of the Dalabute fault in the south of Western Junggar. Based on the previous published geological and geochemical data about the granitoid in this area, this paper concludes the changing tendency of the granitoid from early to late: 1) In corresponding to the rock type change from diorite to granite and alkali feldspar granite, the genetic types show the variation of adakitic granite → arc I-type granite → A-type granite. 2) The rock series present a regular variation of CA → HKCA → SH, with the ratios of Na2O/K2O turning from Na2O/K2O > 1 to Na2O/K2O < 1, correspondingly. 3) The ∑REE, δEu, L/H and contents of Sr and Yb of the granitoid vary regularly, with relatively enriched LILE but depleted HFSE, such as Nb, Ta, etc. 4) All the granitoid have high εNd (t) and low (87Sr/86Sr)i values, with young Nd-model ages. 5) On the discrimination diagram for tectonic setting, that of the granitoid turns from compressional setting associated with subduction-collisional to extensional setting of postcollision. All of these suggest that the granitoid should be resulted from the transition from compression to extension. The early magmatism is probably related to the breakup of the subducted slab.
2011 Vol. 20 (6): 440-451 [Abstract] ( 32 ) [HTML 1KB] [ PDF 1426KB] ( 170 )
452 GEOCHEMISTRY OF VOLCANIC ROCKS OF THE LOWER PERMIAN WULANG FORMATION IN WULASITAI AREA, XINJIANG
PAN Ming-chen, YU Hai-feng, LIANG You-wei, WANG Fu-jun, WANG Fen-li, DING Wei, LI Yan, LI Hong-mei, ZHAO Li-jun, XU Gui-yan
The volcanic rock of Lower Permian Wulang formation, distributed in the Late Paleozoic Awulale rift of IliYisaikehu micro-plate, Kazakhstan-Junggar plate, is the assemblage of continental volcanic rocks and detrital rocks. Intense volcanic activities in the area left thick volcanic accumulation up to 4000 m, which belongs to the middle and upper layers of Wulang formation. The volcanic rocks are dominated by alkali-basic rocks and acidic rocks, characterized by bimodal. Lithogeochemistry shows a tectonic environment of intraplate basalt and continental rift basalt, which is in accordance with its tectonic location. The trachybasalt in the top layer is dated as Early Permian, with 207Pb/206Pb isotopic age of the 285±30 Ma. It is suggested that the volcanic activities of the Late Paleozoic Awulale rift tended to end in Early Permian. Then continental molasse was cumulated in Late Permian, marking the start of stable developing period of intracontinental basin.
2011 Vol. 20 (6): 452-457 [Abstract] ( 46 ) [HTML 1KB] [ PDF 976KB] ( 251 )
458 APPLICATION OF NONMETALLIC MATERIALS IN ENVIRONMENTAL PROTECTION
LIANG Kai
The structures and natures of the nonmetallic mineral materials of bentonite, zeolite, diatomaceous earth, sepiolite and attapulgite are introduced. Their application situation in the environmental protection is summarized. It is suggested to strengthen the basic and practical researches on nonmetallic minerals and develop the production of nonmetallic materials for purpose of environmental protection.
2011 Vol. 20 (6): 458-461 [Abstract] ( 26 ) [HTML 1KB] [ PDF 233KB] ( 424 )
462 REGIONAL METALLOGENIC REGULARITIES OF THE ION ADSORPTION TYPE OF RARE-EARTH DEPOSITS IN GUANGDONG PROVINCE
YANG Da-huan, XIAO Guang-ming
Guangdong is one of the important mineral sites for rare-earth resources in China. The ion adsorption type is the most characteristic of the rare-earth deposits in the province. The ore-bearing protolith is broadly distributed, with favorable metallogenic conditions. Based on the research of the metallogenic features, this paper preliminarily summarizes the oreforming regularities of the ion adsorption type of rare-earth deposits from the aspects of ore-controlling conditions, distribution and enrichment of orebodies to establish the regional metallogenic model.
2011 Vol. 20 (6): 462-468 [Abstract] ( 54 ) [HTML 1KB] [ PDF 541KB] ( 422 )
469 GEOLOGICAL FEATURES OF THE DEEP COAL BED IN THE HUXIANG COALFIELD AND ITS IMPACT ON THE OCCURRENCE OF GAS
ZHANG Lian-qiang, YANG Yi-dong
The Huxiang coalfield is a newly found large coal reserves base in Henan Province. Exploration reveals that, the coal measure strata of Lower Permian Shanxi formation (the second coal formation) occur in 960 to 1400 m below the surface, with two layers of medium to thick coal seams, belonging to peranthracite, lean coal and coke. Because the coal beds in the area are deeply buried, and well closed, a large number of gas is preserved in the coal seam and enriched in the whole area. The analysis on the geological features of deep coal seam and gas occurrence in the Huxiang coalfield will provide basic information for further study on the accumulation conditions and occurrence of gas.
2011 Vol. 20 (6): 469-472 [Abstract] ( 45 ) [HTML 1KB] [ PDF 440KB] ( 244 )
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