Li S.,China University of Geosciences |
Gao Y.,Makah Fisheries Management |
Luo J.,Geological Publishing House |
Cao Y.,China University of Geosciences |
And 5 more authors.
African Journal of Biotechnology | Year: 2011
This paper reports a pilot study on the thermoluminescence (TL) of carbonate minerals of carp otoliths from the heavily polluted Baiyangdian Lake (BYD) in Hebei Province and non-polluted Miyun Water Reservoir (MY) in Beijing Municipality of China. Analyses on trace elements of otoliths and water show that the heavy metal elements of BYD were much higher than those of MY, particularly on chromium (Cr), nickel (Ni), zinc (Zn) and rubidium (Rb) concentrations. These heavy metal elements could infiltrate into the otolith crystals as impurities or defeats, and were responsible for the different TL parameters and TL glow curves between BYD and MY samples. Such differences in carp otoliths would be applicable to other lakes or water reservoirs, and the TL technique could be used as fingerprint in identification of polluted and non-polluted lakes. Also, the TL characteristics of fish otoliths may provide a quick and qualitative means for environmental assessments in lake pollution. © 2011 Academic Journals.
Zhang G.,China University of Geosciences |
Zhang G.,East China Institute of Technology |
He Q.,Geological Publishing House |
Guo J.,China University of Geosciences
Geology Resource Management and Sustainable Development: Proceedings from the 2nd Academic Conference of Geology Resource Management and Sustainable Development 2010 | Year: 2010
Inner Mongolia lies in the joints of North China Plate, Mongolia Plate and Songliao Plate. The special geographical location contributes to the abundant geoheritage resources for this area. The geoheritages in Inner Mongolia cover 7 main types, 21 types, 34 subtypes. The geoheritage resources in Inner Mongolia are rich, typical and have high protection and development value. At present, 2 Global Geoparks, 3 National Geoparks, 3 Autonomous Region Geoparks (provincial) and 2 National Mining Parks are constructed. In this paper, tourist number and tourism income of Hexigten and Alxa Desert Global Geopark are analyzed in detail. Moreover, the social effect is studied as well. Results show that the brand effect of Geopark is significant. The protection of geoheritages should be further strengthened. The exploitation and utilization should be appropriate and sustainable.
Xue J.,Land Consolidation and Rehabilitation Center |
Xue J.,China Agricultural University |
Xue J.,Key Laboratory of Agricultural Land Quality |
Han J.,Geological Publishing House |
And 5 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014
As the material basis for the development of modern agriculture, well-facilitated capital farmland is the key to ensuring food safety in China By improving the comprehensive productivity of cultivated land and agricultural production conditions, the construction of well-facilitated capital farmland and its effective management and efficient utilization has great significance for food security and the development of modern agriculture. Taking Fujin city of Heilongjiang Province as an example, the paper conducted a study on the well-facilitated capital farmland construction sequence. The main conclusions of the study were as follows: It introduces the Four Quadrant model by a feasibility and spatial stability analysis on a well-facilitated capital farmland construction sequence. It comprehensively determined a well-facilitated capital farmland construction sequence combined with the construction scale and goal orientation. Evaluation of the construction feasibility is mainly used to reflect the feasibility of a well-facilitated capital farmland construction sequence. The evaluation index was selected from three aspects including natural quality, engineering construction, and economic society. It mainly included thickness of effective soil, field area, and the later maintenance funding levels. Spatial stability evaluation is mainly used to reflect the spatial stability after well-facilitated capital farmland is constructed. It selected the distance to the county seat, the distance to the township, the distance to the main roads, the distance to potential geological hazards, population density, local finance income, and other indicators from three aspects including location, ecology, and the construction land expansion force. The cultivated land to be evaluated was divided into three levels including high feasibility, medium feasibility, and low-grade feasibility based on the well-facilitated capital farmland construction feasibility evaluation model. The area of the highly feasible region was 13.18×104hm2 (22.69% of the total evaluation area), it was mainly in the state farms especially in the Qixing Farm and the Daxing Farm. The moderate feasible area was 22.72×104 hm2 (39.13% of the total evaluation area). It was distributed in the state farm and local government areas and the area was equal. It was mainly distributed in the Daxing Farm and the Qixing Farm of the state farms and Jinshan town of the local government; The low feasible area was 22.18×104hm2 (38.18% of the total evaluation area), all are located in the local government's area except for a little distribution in Qianjin Farm. On the issue of space stability, the area of highly stability, area of moderate stability, and area of low stability of well-facilitated capital farmland construction in Fujin City was 7.58×104hm2, 27.73×104hm2 and 22.77×104hm2. It occupied respectively 13.06%, 47.73%, and 39.21% of the evaluation area. Highly stable areas were mainly distributed in the farm on the east of Fujin city; moderate stability areas were mainly distributed in the local towns in the south and west of Fujin city; and low stability areas were mainly distributed in the township in the western northern and central areas of Fujin city. The unstable areas were mainly distributed in the Songhua River, Sanhuanpao Nature Reserve, and some important areas of the rivers and city construction expansion area. It was coupled to the feasibility and spatial stability of well-facilitated capital farmland construction by the Four Quadrant model. It determined the well-facilitated capital farmland construction sequence based on the goal orientation of spatial stability priority. Qixing Farm, Hongwei Farm, Qianjin Farm, and Qinglongshan Farm are priority areas of well-facilitated capital farmland construction.
Cao Y.,China University of Geosciences |
Zheng Z.,Geological Publishing House |
Du Y.,China University of Geosciences |
Gao F.,China University of Geosciences |
And 3 more authors.
Ore Geology Reviews | Year: 2016
The Hucunnan ore deposit is a representative skarn Cu-Mo deposit in the Tongling district, an important ore district of the renowned Middle-Lower Yangtze River metallogenic belt of China. The deposit shows distinct zonation of metals, with Cu mineralization distributed mainly in the exoskarn zone at shallow depths, and Mo mineralization occurring chiefly in the endoskarn zone located at deeper depths. Field evidence and petrographic observations indicate that the ore-forming processes can be divided into the skarn, quartz-molybdenite, quartz-chalcopyrite, and carbonate stages. Five types of fluid inclusions (FIs) are present in the deposit: solid-bearing (type 1), liquid-rich (type 2), vapor-rich (type 3), pure vapor (type 4), and CO2-bearing (type 5). The skarn stage contains mainly type 1 and 2, but also minor type 3 and 4 FIs; the FIs display homogenization temperatures of 434-570°C and salinities of 2.07-66.0wt.% NaCl equiv. The existence of hematite daughter minerals in the type 1 inclusions, together with the presence of magnetite in skarn, implies that the skarn-stage fluid was oxidizing. The skarnization of the granodiorite porphyry is commonly accompanied by potassic alteration, suggesting that the fluids were rich in alkali. Similar to the skarn stage, the quartz-molybdenite stage contains type 1 and 2, and minor type 3 and 4 FIs, which yield homogenization temperatures of 280-458°C and salinities of 1.40-54.2wt.% NaCl equiv. The presence of sulfide instead of hematite daughter minerals in the type 1 inclusions in quartz-molybdenite veins associated with sericitization indicates that the fluids of the quartz-molybdenite stage were more reducing and more acidic than the fluids in the skarn stage. The decrease in oxygen fugacity and increase in acidity could have resulted from magnetite crystallization and the consumption of alkali cations and OH-, respectively, during the skarn stage. The quartz-chalcopyrite stage contains all types of FIs, which show homogenization temperatures of 203-392°C and salinities of 1.22-46.6wt.% NaCl equiv. Observations of hematite-bearing type 1 FIs in quartz-chalcopyrite veins containing anhydrite associated with biotitization suggest that the fluids of the quartz-chalcopyrite stage were oxidizing and alkali-rich, probably on account of the inflow of meteoric water and boiling in an open system. In the carbonate stage, only type 2 FIs are present; these FIs yield the lowest homogenization temperatures of 156-276°C and the lowest salinities of 1.05-12.3wt.% NaCl equiv. Microthermometry and H-O isotope data indicate that the ore-forming fluids were dominated by magmatic water in the early stages (skarn and quartz-molybdenite stages), and that the magmatic water gradually mixed with circulating meteoric water during the late stages (quartz-chalcopyrite and carbonate stages). The coexistence of saline and vapor-rich FIs as internal trails or clusters within individual crystals, with similar homogenization temperatures but contrasting salinities and homogenization modes (to the liquid and vapor, respectively), in the first three stages strongly suggests that three episodes of fluid boiling occurred in these stages, as further supported by the hydrogen isotopic compositions of the fluids, which are lower than those of magmatic water. Based on the above data, we conclude that temporal changes in redox conditions, acidity, and temperature in the mineralizing fluids resulted in the temporal separation of Cu and Mo by selective sulfide precipitation in the Hucunnan skarn deposit. The competition among metals (e.g., Mo and Cu) for sulfur in magmatic fluids, along with vapor-brine immiscibility (fluid boiling), are major factors that contributed to the spatial separation of Cu and Mo in the deposit. © 2016 Elsevier B.V.
Li C.-L.,Heilongjiang Institute of Geological Survey |
Li C.-L.,China University of Geosciences |
Li S.-R.,China University of Geosciences |
Luo J.-Y.,Geological Publishing House |
And 2 more authors.
Geology in China | Year: 2011
The Yixingzhai gold deposit is located in Fansi County, Shanxi Province, whose mineralization belongs to quartz-vein type. The main gold mineral is single electrum, together with minor native gold. The gold minerals commonly assume rounded, wheat-like , irregular brecciated and veinlet forms, with grain size in the range of 10-50 μm in diameter. They occur mainly in gold-bearing minerals such as pyrite, chalcopyrite and quartz, in the form of inclusion gold, intercrystalline gold and fissure gold. The authors made statistical analysis of the shapes, grain sizes and modes of occurrence of gold minerals by using quantity statistical method and area statistical method, and the results indicate that different gold minerals show remarkable differences in occurrence rate and area distribution. Gold-bearing minerals generally contain iron, sulfur, copper, zinc and lead. Analytical results indicate that iron and sulfur show inverse correlation with gold, and have stable lead content and remarkably varying copper and zinc content. In combination with the relationship between the temperature and the Au and Ag content, the authors suggest that the gold minerals formed in medium-low temperature. The average gold fineness ranges from 510.7 to 887.9 with an average of 653.6, suggesting an epithermal metallogenic environment for the Yixingzhai gold deposit. From 1350 m level to 1070 m level, the average fineness of gold minerals gradually decreases from 778.4 to 651.7, showing characteristics of reverse zoning and indicating that there probably exist stable ore bodies below 1070 m level.
Mei H.Q.,Geological Publishing House |
Jie W.Y.,China University of Geosciences
Proceedings of the 3rd Academic Conference of Geology Resource Management and Sustainable Development, GRMSD 2015 | Year: 2015
Xinglong National Geopark of Hebei Province, China (XLNG) has a great quantity of geoheritage with significance on scientific research and geotourism. The paper described geodiversity of XLNG, including the characteristics, scientific significance and formation processes, which embraces geological structures, ROCK MASSES AND DIFFERENT TYPES OF GEOMORPHOLOGIC LANDSCAPES AND SO ON.. WHAT'S MORE, GEOTOURISM BASED ON geoconservation in XLNG are studied, which may provide important information for geopark development in China.
Liang Y.-P.,Geological Publishing House |
Zhang K.-X.,Hubei University |
Song B.-W.,Hubei University |
Wang G.-C.,Hubei University |
And 4 more authors.
Geological Bulletin of China | Year: 2013
Based on an integrated study of the geological maps and previous achievements, the authors analyzed the attributes, tectonic settings and lithofacies-stratigraphic sequences of the remnant basins in the Tibetan plateau. In Paleocene, the Tibetan Plateau was characterized by the erosional areas in western Kunlun, Altun, Qilian, western Qinling, Songpan-Garze and Gangdise, the Alxa and Indian ancient lands and the depressed basins (lakes and pluvial plains) in Xining-Lanzhou, Chengdu and Baingoin. There existed Neo-Tethyan remnant sea in western and southern Tibetan Plateau. It is held that the paleogeography of the Neo-Tethyan remnant sea was a remnant oceanic basin to the west of the Saga area and a foreland basin to the east of Saga during the Paleocene. The authors argue that the closure of the Neo-Tethys progressed from east to west.