Shandong Institute of Geological science
Shandong Institute of Geological science
Li G.-Q.,China University of Geosciences |
Cheng W.-B.,Chengdu University of Technology |
Zhang Y.-M.,China University of Geosciences |
Zhang Y.,Shandong Institute of Geological Science |
And 3 more authors.
Bulletin of Mineralogy Petrology and Geochemistry | Year: 2014
The Lower Jurassic Ridang Formation is an important ore-hosting layer and ore-source bed in the Zhaxikang Sb-Pb-Zn-Ag polymetallic ore-concentrated district in South Tibet. The initial enrichment mechanism for oreforming elements of the Ridang Formation has been discussed in this study. Geochemical study shows that the contents of SiO2, MgO, Rb and Zr in various rocks from the Ridang Formation are similar to the world's average shale on terrigenous background, and thus, the continental input could not serve as a major factor for the enrichment of ore-forming elements. For these rocks, the Fe3+/TFe ratios are less than 0. 5, the enrichment factor (EF) values of U, V, Cr, Co and Ni are less than 5, and Ce has no obvious negative anomaly, reflecting that they formed in the condition of oxidized to sub-oxidized bottom water during sedimentation and the ore-forming elements could not be concentrated by authigenous minerals under the condition of anoxic-sulfurized bottom water. The EF values of P and Ba that serve as indicators of productivity are less than 1, suggesting a low to normal ancient productivity condition and reflecting that the ore-forming elements are not the products of biological enrichment under high productivity condition. The enrichment of As, Sb and Ag, locally positive Eu anomalies, as well as the existence of altered andesite and hydrothermal sediments in the reginal Ridang Formation suggest that seafloor hydrothermal activity is likely responsible for the enrichment of ore-forming elements in the Ridang Formation of the Zhaxikang oreconcentrated district.
Han Z.,Shandong University of Science and Technology |
Zhang X.,Shandong University of Science and Technology |
Chi N.,Shandong Institute of Geological science |
Han M.,Shandong University of Science and Technology |
And 3 more authors.
Carbonates and Evaporites | Year: 2015
This study illustrates features of the Cambrian oncoids and provides a comparison with other microbial-related carbonate grains found in the Cambrian succession of the North China epeiric platform. Based on cortex structures, four types of oncoids were distinguished: thin-cortex (superficial) oncoids, laminated-cortex oncoids, clotted-cortex oncoids, and full-cortex (without nucleus) oncoids. Thin- and clotted-cortex oncoids are often associated with oolites, laminated-cortex oncoids are present within oolitic-bioclastic grainstones, and full-cortex oncoids occur in bioturbated wackestones. The oncoids with nucleus–cortex structures are easily distinguished from other carbonate grains due to the lack of nucleus–cortex structures, and from microbial-related ooids which have more circular shape and more continuous cortex than oncoids. Oncoids without nucleus and with only crudely laminated cortex (i.e., full-cortex oncoids) can be differentiated from microbialite intraclasts and microbial lumps by the following evidences: (1) microbialite intraclasts, either rounded or angular, are characterized by margins that sharply truncate the included calcified microbes or carbonate grains and, in addition, intraclast-bearing conglomerates commonly show clear sedimentary structures such as cross-stratification and normal grading; (2) microbial aggregates have irregular but smooth margins, and rather chaotic inner structures. © 2014, Springer-Verlag Berlin Heidelberg.
Song M.,Shandong Provincial Engineering Research Center for Geological Prospecting |
Song Y.,REPUBLIC RESOURCES |
Song Y.,Shandong Institute of Geological science |
Li J.,Shijiazhuang University of Economics |
Li S.,Shandong Institute of Geophysical and Geochemical Exploration
Geotectonica et Metallogenia | Year: 2015
Besides the famous and extensive gold mineralization, molybdenum, tungsten, copper, lead and zinc ore mineralization are also commonly found in the eastern Shandong Peninsula. In order to delineate the metallogeny of the ore deposits, characteristics of the typical deposits, temporal and spatial relationship of the ore deposits and the plutons, sources of ore-forming material, and ore-forming conditions are studied in this paper. The results show that the age of magmatism and ore-formation is mainly concentrated in the interval of 127.6-105 Ma, and the ore-forming material was originated from crustal and mantle sources. The density and size of the gold deposits decreased eastward in the eastern Shandong Peninsula, while those of the nonferrous metal deposits increase. The dominant ore metals change from molybdenum and wolfram-copper, lead, zinc, silver, polymetallic to gold from the interior of the Weideshan-type granite to exterior. The gold deposits are commonly occurred in various wall rocks intruded by the Weideshan granite. And the gold deposits include two major types. One is the Jiaojia-type that occurs in the altered rocks commonly related to fracture zones of large and gently-dipping faults. The other is the Linglong-type which occurs as quartz veins in steeply-dipping secondary fractures. The characteristics of the nonferrous metal deposits may conclude as "the same source of metallogenic material, two kinds of surrounding rocks, three types of ore-forming structural zones, and four alteration styles". Gold and nonferrous metal deposits are closely related genetically in the eastern Shandong Peninsula. The variety of the mineralization is due to different physiochemical condition of ore-formation and location of ore occurrence. These deposits are all the products of the Yanshanian magmatism. Their isotopic ages are very similar and consistent with the age of the Weideshan-type granite. These deposits form a metallogenic series of hydrothermal deposit which is related to the Weideshan-type granite. Based on the analysis above, we conclude that magmatism, fluid activity and extensional structures are key factors for ore-formation. During the lithospheric thinning in the Cretaceous at the Eastern China, the "thermal upwelling-extensional structures" caused by the large-scale magmatism in the eastern Shandong Peninsula provided favorable spaces for mineralization. The course of ore-forming can be summarized as follows: The metallic elements extracted by the magmatic fluids related to the Weideshan-type granite and the mantle-derived fluids, formed the molybdenum, molybdenum-wolfram and lead-zinc deposits of porphyry-skarn type. Whereas the metallic elements extracted by the compound fluids, which are composed of the magmatic fluids, the activated fluids of surrounding rocks and the mantle-derived fluids, formed the altered rocks type and the quartz vein type gold deposits and the vein-type polymetallic deposits. © 2015, Science Press. All right reserved.
Zhang G.,Shandong University |
Pan Z.,Shandong Institute of Geological science |
Wang X.,Shandong Environmental Protection Research Institute |
Mo X.,Shandong Environmental Protection Research Institute |
Li X.,Shandong University
Environmental Monitoring and Assessment | Year: 2015
The concentrations of polycyclic aromatic hydrocarbons (PAHs) were analyzed in water, sediment, and biota (aquatic plant, shrimp, and fish) of Nansi Lake by gas chromatography–mass spectrometry (GC–MS). The concentrations of total PAHs were 27.54–55.04 ng L–1 in water, 80.31–639.23 ng g−1 dry weight (dw) in sediments, 20.92–192.78 ng g−1 dw in aquatic plants, and 67.3–533.9 ng g–1 dw in fish and shrimp muscles. The ratios of phenanthrene to anthracene (Ph/An), fluoranthene to pyrene (Flu/Pyr), and low molecular weight to high molecular weight (LMW/HMW) in sediment indicated that the sources of the PAHs were a mixture of pyrolytic and petrogenic contamination at most sampling sites in Nansi Lake. The composition profile of PAHs in plants was similar to that in water and animals with 2–3 ring PAHs being dominant. The 4–6 ring PAHs were the dominant PAH compounds in sediment. There is a positive correlation between sediment and aquatic plants, but their PAH composition profiles were different, implying that aquatic plant absorption of PAHs from sediment is selective and the accumulation of PAHs in aquatic plants is different. The concentration of PAHs in fish showed a positive correlation with plants, reflecting that the PAHs in fish are mainly absorbed from aquatic plants rather than directly from the water. Bioaccumulation of LMW PAHs in aquatic biota was higher than HMW PAHs. The biota-sediment accumulation factor (BSAF) values of total PAHs in the plants Potamogeton lucens Linn and Ceratophyllum demersum Linn were higher than that in most animals. The BSAF values of total PAHs in animals were in the following order: Cyprinus carpio > Macrobrachium nipponense > Carassius auratus > Channa argus. There was no significant relationship between PAH bioaccumulation and trophic levels in Nansi Lake. Risk assessment of PAHs in water, sediment, and animals indicated that the water environment of Nansi Lake is safe at present. It is worthwhile to note that benzo [a] anthracene (BaA), benzo [a] pyrene (BaP), indeno [1,2,3-cd] pyrene (InP), dibenz [a, h] anthracene (DBA), and benzo [ghi] perylene (BghiP) were detected in sediment, plants, and animals at all sampling sites, and they have potential carcinogenicity to the organisms of Nansi Lake. © 2015, Springer International Publishing Switzerland.
Song M.-C.,Bureau of Mineral Resources |
Song M.-C.,Shandong Engineering Research Center for Geological Exploration |
Jiao X.-M.,Bureau of Mineral Resources |
Jiao X.-M.,Shandong Engineering Research Center for Geological Exploration |
And 5 more authors.
Geology in China | Year: 2016
The Jining Group is concealed low-grade metamorphosed strata in western Shandong Province. Based on isotopie ages and micropaleoplants analysis, combined with regional stratigraphie correlation and iron formations correlation, this paper discusses formation age of Jining Group. Results of isotopie age determination show that the genesis of zircon grains in dacite is complex, the upper intercept age of 7 points from 16 zircon analyzed points is 2522±7 Ma and the youngest age is 2487±7 Ma. In 30 pieces of rock samples, 11 samples were found to contain the microplants, which are mainly lower diversity simple spherical acritarchs, such as Leiosphaeridia, Trachysphaeridium and Stictosphaeridium. After comparison, it is considered that stratigraphie characteristics and metamorphic grade of Jining Group are similar to features of Proterozoic and Mesoproterozoic strata in North China, and are different from things of Neoarchean strata. Characteristics of seam of iron ore in Jining Group are unlike Neoarchean BIF in western Shandong Province and North China Craton; nevertheless, they are very similar to features of Yuanjiacun BIF in Shanxi Province. Synthetic analysis shows that Jining Group was formed in the transitional period from Archaean to Proterozoic. The thorough study is helpful to understanding the evolution of the regional geological environment in Archaean-Proterozoic period.
Peng N.,Chinese Academy of Geological Sciences |
Liu Y.-Q.,Chinese Academy of Geological Sciences |
Kuang H.-W.,Chinese Academy of Geological Sciences |
Xu H.,Chinese Academy of Geological Sciences |
And 4 more authors.
Geology in China | Year: 2015
Using the paleocurrents, gravels composition and detrital zircons age spectrum, the authors analyzed the provenance of Early Cretaceous Laiyang Group in Jiaolai basin and its geological significance. The paleocurrents show a stable northward direction in Wulian-Zhucheng, but gradually change from E-SE at the early stage to W-NW at the late stage in Laiyang-Rushan. Gravels in Wulian- Zhucheng- Jiaozhou comprise mainly granite gneiss, granite, marble and quartzite; in Laiyang- Rushan, however, granites are dominant at the early stage and multiple gravels are present at the late stage. Detrital zircons ages are primarily distributed in the ranges of 110-145 Ma, 150-180 Ma, 200-250 Ma, 600-950 Ma and 1700-2600 Ma, whereas Paleozoic zircons are rarely seen. All these features indicate that there existed three main sources for Early Cretaceous Jiaolai Basin: HP-UHP metamorphic rocks and shallow metamorphic complex of Sulu orogen, Yanshanian granites (J2-3-K1), and Metamorphic rocks from the Jiaobei uplift. Additionally, the regional difference of provenance is apparent, which suggests the southern part and the northern part of Sulu orogenic belt experienced different orogenic processes. The southern Sulu orogenic belt experienced large-scale uplift and was stable, whereas the northern Sulu orogenic belt was subjected to small-scale uplift and collapsed at the late stage. It is also concluded from the provenance that the ancient landform of Jiaolai basin in the southwest was higher than in the east during the sedimentation of Early Cretaceous Laiyang Group until the late stage of the sedimentation when the east part of the basin was uplifted.
Jiang H.-K.,Key Laboratory of Geological Processes for Mineralization of Metal Mineral and Resources Utilization in Shandong Province |
Jiang H.-K.,Key Laboratory of Ministry of Land and Resources for Mineralization of Gold Mine and Resources Utilization |
Jiang H.-K.,Shandong Institute of Geological science |
Xu W.-D.,Shandong Institute of Geological science |
And 9 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2015
The miniature neutron source reactor (MNSR) is based on highly enriched uranium (235U) as fuel and light water as moderator. Because of a larger share of epithermal neutron and fast neutron in irradiation channel, the reactor is suitable for epithermal neutron activation analysis (ENAA). In general neutron activation analysis the main component elements in complex geological samples such as aluminum, sodium, iron and so on affect the determination accuracy of some target elements. In order to reduce the interference of the background of main component elements and improve the precision and detection limit of the target element, the ENAA can be used in the test of geological samples. By using epithermal neutron irradiation channel made of cadmium, the Cd ratios of about 130 nuclides of 67 elements in the periodic table were measured. The advantage factors of some elements and the interferences of uranium fission and (n,p) reaction in ENAA were discussed. The practical application of MNSR ENAA method in testing of geological sample was verified. The results show that more than 20 kinds of elements can be ascertained in the sample measuring by this method. The detection limit, precision and accuracy are more significantly improved. The MNSR ENAA is a necessary and beneficial supplement of the conventional activation analysis method. ©, 2015, Atomic Energy Press. All right reserved.
Jiang H.,Key Laboratory of Geo Proc for Mineralization of Metal Mineral and Res Utilization in Shandong Province |
Jiang H.,Shandong Institute of Geological science |
Jiang Y.,Key Laboratory of Geo Proc for Mineralization of Metal Mineral and Res Utilization in Shandong Province |
Jiang Y.,Shandong Institute of Geological science |
And 2 more authors.
He Jishu/Nuclear Techniques | Year: 2014
Background: Instrument neutron activation analysis is a nondestructive analytic method. Some elements after irradiation produce short half-life radio-nuclides (<60 s), and others produce both long-lived and short-lived nuclides. For these short-lived nuclides, the single measurement has big error. Purpose: In order to reduce the error, cyclic neutron activation analysis can be used to improve the sensitivity. Methods: A device was designed to be connected to the sample transporter, detector and irradiation pipeline in the reactor, which can automatically control the irradiation time and counting time. According to the nuclear parameters of certain elements, irradiation time and counting time and cycle times were determined by experiment. Cyclic activation analysis method was established at the mini-reactor. Results: This paper studied cyclic activation analysis conditions of 17 kinds of element, and applied to the determination of actual samples. Cyclic epithermal neutron activation analysis (CENAA) method was discussed too. By the analysis of national standard reference materials, the reliability of this method was confirmed. Conclusion: Cyclic neutron activation analysis (CNAA) is an effective analytic method for only short life nuclide elements. For both short and long lived nuclides of elements, the cyclic activation analysis method can make the analytical cycle shorten, from a few days or several weeks to within a few minutes. Cyclic activation analysis has the advantages of high sensitivity, and its precision and accuracy are better than single short irradiation activation analysis.
Wang K.,China University of Mining and Technology |
Wang K.,Shandong Institute of Geological science |
Li N.,Shandong University |
Yu X.,Shandong Institute of Geological science |
And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014
In consideration of the eco-environmental status and the societal and economical characteristics of Shandong Peninsula, the ecological carrying capacity (ECC) evaluation index system based on 25 indexes was set up by using the pressure-state-response (P-S-R) concept model. The index weight was firstly defined according the analytic hierarchy process (AHP), and ECC of 6 cities in Shandong peninsula in 2009 and 2012 was then estimated by fuzzy comprehensive evaluation method. The result indicates that: (1) The ECC of Weihai was excellent (Grade I) and kept improving year by year; (2) The ECC of Qingdao, Yantai, and Rizhao were good (Grade II). ECC valuation of Qingdao and Yantai rose steadily from 2009 to 2012, but Rizhao dropped slightly; (3) The ECC of Weifang was medium (Grade III) and the ECC valuation dropped slightly year by year; (4) The ECC of Dongying rosesteadily (from Grade IV to III) from 2009 to 2012. By analyzing the ECC of each city, this study provides a scientific basis for ecological development.
Xia C.-B.,Shandong Institute of Geological science |
Xia C.-B.,Key Laboratory of Geological Processes for Mineralization of Metal Minerals and Resource Utilization in Shandong Province |
Zhao W.,Shandong Institute of Geological science |
Zhao W.,Key Laboratory of Geological Processes for Mineralization of Metal Minerals and Resource Utilization in Shandong Province |
And 6 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2016
After the magnesite sample was prepared with fusion method, the content of MgO, Al2O3, SiO2, P2O5, CaO, TiO2, MnO and Fe2O3 in magnesite was determined by X-ray fluorescence spectrometry(XRF), realizing the simultaneous determination of major and minor components. The calibration curve was plotted with the national certified reference materials of dolomite, brucite and limestone and artificially synthetic calibration sample, solving the determination problems of high content MgO and low content CaO. The loss on ignition of sample was firstly measured. Then, the burned sample was prepared for fuse pieces. The calibration curve was established by the content after correction of loss on ignition and the corresponding X-ray fluorescence intensity, and the matrix correction was also conducted. Finally, the content in burned sample was determined to calculate the content in actual sample. The dilution ratio between the burned sample and flux (Li2B4O7) was 1∶10. One drop of LiBr solution (1.0 g/mL) was added and used as releasing agent. The fuse piece was prepared at 1 050℃ for 9 min. The correlation coefficients of calibration curves of components were between 0.997 6 and 0.999 9. The detection limit of method was 10-320 μg/g. One actual magnesite sample was used for precision test. The relative standard deviation(RSD, n=12) of components were between 0.25% and 3.6%. The proposed method was applied to the determination of certified reference material and actual samples of magnesite, and the results were basically consistent with the certified values and those obtained by wet method. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.