Time filter

Source Type

Zhang W.,University of Jinan | Cao F.,University of Jinan | Yang L.,University of Jinan | Dai J.,Shandong Institute of Geological Survey | Pang X.,Shandong Institute of Geological Survey
Environmental Geochemistry and Health | Year: 2017

Nansi Lake is composed of four sub-lakes from north to south: Nanyang Lake, Dushan Lake, Zhaoyang Lake and Weishan Lake. An environmental pollution investigation was carried out to determine the fractionation, and pollution assessments of mercury (Hg) in surficial sediments from Nansi Lake. Results showed that the mean concentration of Hg was 3.1 times higher than its background value (0.015 mg kg−1), and the high concentration of Hg which even reached up to five times than the background value in the part of Dushan Lake and Weishan Lake, which indicated that there are obvious spatial differences. The content of Hg was positively correlated with that of total organic carbon, and negatively correlated with that of pH and SiO2 in surface sediments. An improved Tessier sequential extraction procedure was used to study the fractions of Hg in sediments. The results indicated that Hg existed primarily in the fraction of residual, which accounts for 58.4% of total mercury (THg), and the percentage of extractable Hg was only 1.93% of total mercury. High concentrations of mercury of non-residual phase were found in part lake area from the Nanyang Lake and the Weishan Lake, which indicating a higher potential ecological risk relative to the other lake areas. Based on the values of enrichment factor and geo-accumulation index, most part of Dushan Lake and Nanyang Lake and Weishan Lake were in a moderate pollution. And based on the fractionation of mercury, risk assessment code of Hg exhibited low risks to the environment in Nansi Lake. © 2017 Springer Science+Business Media Dordrecht

Wang W.,Chinese Academy of Geological Sciences | Zhai M.-G.,Chinese Academy of Sciences | Wang S.-J.,Shandong Institute of Geological Survey | Santosh M.,University of Adelaide | Santosh M.,China University of Geosciences
Precambrian Research | Year: 2016

The Neoarchean era is an important period for the formation of continental crust in the early earth. The North China Craton (NCC) records magmatism during 2.8–2.7 Ga and 2.6–2.5 Ga with the latter more extensive. However, the ∼2.7 Ga rock assemblages are significantly different from those of the ∼2.5 Ga rocks. Based on detailed field investigation, we present results of zircon geochronology by using SHRIMP and LA-ICP–MS techniques on the Shanggang pluton in the central belt of the western Shandong Province (WSP). The Shanggang pluton is composed of 2.71–2.69 Ga strongly deformed tonalite on the eastern and northern margins with the central part occupied by younger (2.67–2.65 Ga and 2.63–2.61 Ga) trondhjemite. Most zircon grains with apparent 207Pb/206Pb ages of 2.67–2.66 Ga in our samples have low Th/U ratios (0.05–0.20) resulted from low to moderate Th contents of 10–130 ppm and relatively higher U contents of 100–3000 ppm, consistent with those of anatectic zircons. Some of grains carry ∼2.7 Ga inherited cores. Our study reveals that the crustal re-working event at 2.67–2.66 Ga might have been more widespread than currently known, although the 2.67–2.66 Ga zircons have positive εHf(t) values close to that of coeval depleted mantle (Wan et al., 2014). Together with data from previous studies, it is notable that more trondhjemite and even some granite were generated during 2.67–2.60 Ga. Relative to the older TTG suites (2.72–2.69 Ga), the younger ones (2.67–2.60 Ga) are dominated by trondhjemite. The compositional variations of TTG suites through the early to middle Neoarchean suggest that the 2.67–2.60 Ga magmatic and anatectic events should be related to the compositional differentiation of the Archean continental crust of the WSP. © 2016 Elsevier B.V.

Yang L.-Q.,China University of Geosciences | Deng J.,China University of Geosciences | Guo L.-N.,China University of Geosciences | Wang Z.-L.,China University of Geosciences | And 2 more authors.
Ore Geology Reviews | Year: 2016

The Early Cretaceous Taishang gold deposit is the largest deposit in the Linglong goldfield, Jiaodong Peninsula, with a pre-mining endowment of 326. t of gold. It is hosted in the 165-150. Ma Linglong biotite granite and controlled by the NEE- to NE-trending Potouqing Fault near the northern end of the regional Zhaoping Fault system. Hydrothermal alteration is well developed in the footwall of the Potouqing Fault and is characterized by a narrow zone of sericitization, followed by a wider zone of silicification, and an even wider zone of potassic alteration. The main orebodies (No. I orebody) comprise disseminated and stockwork-veinlet systems, although about 5% of the resources are in larger quartz veins (No. II orebody). Four stages have been identified for both styles of mineralization, on the basis of cross-cutting relationships and mineralogical and textural characteristics: pyrite-quartz-sericite (stage 1), quartz-pyrite (stage 2), quartz-pyrite-base-metal-sulfide (stage 3) and quartz-carbonate (stage 4). Gold was mainly deposited in stages 2 and 3, with minor amounts in stage 1.Petrographical, microthermometric, and laser Raman spectroscopic studies on fluid-inclusion assemblages in quartz and calcite from the four stages reveal three types of primary fluid inclusions: type 1 H2O-rich aqueous-carbonic, type 2 CO2-rich aqueous-carbonic, and rare type 3 carbonic inclusions. Stage 1 quartz primary inclusions are only type 1 inclusions, with an estimated composition of 88% H2O, 10% CO2, 4.5 wt.% NaCl equiv., and 0.5% CH4, with trapping at ~336°C and ~1.7kbars. The gold-rich stages 2 and 3 from both orebodies typically contain primary fluid-inclusion assemblages with both type 1 and 2 inclusions, which show similar phase-transition temperatures and were trapped between 246° and 294°C. The stage 4 quartz and calcite contain only primary type 1 inclusions, which are estimated to have a composition of 93% H2O, 6.0% CO2, 3.6 wt.% NaCl equiv., and trace amount of CH4, and were trapped at temperatures of >236°C.The δ34S values of hydrothermal pyrite from the four stages have a narrow range from 4.5‰ to 8.0‰, and are within the ranges for whole-rock sulfides from the Archean Jiaodong Group, and magmatic pyrite from Mesozoic granitoid and intermediate-basic dikes. The δ18O values of hydrothermal quartz range mainly from 10.9 to 12.5‰ and remain constant for all four stages; calculated fluid δ18O values are 1.3-10.0‰. The δDwater values calculated from hydrothermal sericite range from -60 to -45‰. Considering the fluid inclusion compositions, δ18O and δD compositions of ore-forming fluids, and regional geological events, the most likely ultimate potential fluid and metal reservoirs would be the Paleo-Pacific oceanic slab and its overlying sediments, which were thrust below the high-grade metamorphic rocks of the Jiaodong Peninsula.The initial ore-forming fluids were medium-high temperature, CO2-rich, and low salinity H2O-CO2-NaCl±CH4 homogeneous fluids. Over the duration of the hydrothermal system, the fluid remained fairly consistent in P-T-X, although becoming slightly more water-rich during final post-ore activity. Fluid immiscibility occurred during stages 2 and 3 ore deposition at pressures that fluctuated strongly from 1700 to 580bars during hydrofracturing. The (HS)2 - ion was the most probable gold-transporting complex at Taishang. Wall-rock sulfidation and episodic pressure drops, with associated fluid unmixing and other chemical changes, were the two main mechanisms of ore deposition. © 2015 Elsevier B.V.

Xie H.Q.,Chinese Academy of Geological Sciences | Wan Y.S.,Chinese Academy of Geological Sciences | Wang S.,Shandong Institute of Geological Survey | Liu D.Y.,Chinese Academy of Geological Sciences | And 4 more authors.
Acta Petrologica Sinica | Year: 2013

∼2.5Ga and ∼ 1.9Ga metamorphic events are widely recorded all over the North China Craton, being important for understanding the formation and evolution of the craton. Eastern Shandong is located in the eastern North China Craton and contains metamorphic rocks with ca. 2.5Ga and ca. 1.9Ga metamorphic zircon ages. For further constraining the Early Precambrian tectono-thermal events in the area, we carried out detailed field observation and SHRIMP U-Pb zircon dating in a road cutting section near Tangezhuang, Laixi County, eastern Shandong. The outcrop consists of interlayered and folded trondhjemitic gneisses and amphibolites. The foliation of the rocks is completely parallel to each other and shows thin interlayer in strong deformation domain, suggesting that thin interlayers of different components cannot be considered as a fact that the protoliths are sedimentary in origin. SHRIMP U-Pb zircon dating yielded an age of 2496 ± 10Ma (MSWD =0.45) for magmatic zircons from a trondhjemitic gneiss sample (S1105), with metamorphic rims having ages of ca. 2.5Ga and ca. 1.9Ga. Two amphibolite samples (S1238 and S0812) contain metamorphic zircons with ages of 1842 ± 3Ma (MSWD = 1.6) and 1833 ± 13Ma (MSWD = 1.0), respectively, but no magmatic zircons have been identified. Combining with previous researches, we suggest that the Late Neoarchean metamorphism widespread over the whole Jiaodong terrane, leading to anatexis and recycling of older crust material, and the Late Paleoproterozoic metamorphism shows a zonal feature as a result of orogenesis.

Yang L.-Z.,Shandong Institute of Geological Survey | Qu W.-L.,Qingdao Geo engineering Exploration Institute | Zhang Y.,Shandong Institute of Geophysical and Geochemical Exploration | Liu C.-H.,Shandong Institute of Geological Survey
Acta Geoscientica Sinica | Year: 2013

Aimed at solving the geo-environmental problems such as land subsidence resulting from continuous falling of water table due to over-exploitation, the authors selected the area of deep groundwater in Dezhou City as the key study area and took water chemical composition and environmental isotopic information as the study targets to discuss origin and refreshing capacity of deep groundwater. The results show that deep groundwater in Dezhou was mainly derived from precipitation in the last glacial period characterized by cold climate. During its formation, it had the characteristics of leaching and was affected by evaporation and cation exchange action. Later, it was interfered by many times of seawater invasion. It was dominated by HCO3-Na type water characterized by high fluorine, high sodium, low calcium and alkalescence, together with low concentrations of hydrogen and oxygen isotopes and low tritium content. The deep groundwater in Dezhou is recycled slowly and its refreshing capability is weak.

Liang N.,University of Jinan | Yang L.,University of Jinan | Dai J.,Shandong Institute of Geological Survey | Pang X.,Shandong Institute of Geological Survey
Procedia Environmental Sciences | Year: 2011

The concentrations and distribution patterns of lead, mercury, zinc, copper, chromium, arsenic, cadmium in surface water of Linglong deposit area were discussed. The result shows that the surface water of Linglong mining area is seriously polluted by mercury, zinc and cadmium, which of the concentration are higher than the III class of National Surface Water Quality Standard, and moderately polluted by chromium and arsenic, which of the concentration conforms to the III class national surface water quality standard, and light polluted by lead and copper, which of the concentration conforms to the II class national surface water quality standard. The concentration of heavy metals in the gold deposit areas depends upon the distance from the pollution source and scalar transport in rivulet flows, decreases along the flow direction. The concentration and distribution of heavy metal pollutants in surface water are dominated by the geochemical situation and the pollution source, but seriously affected by mining leachate and chemical wastewater discharge. © 2011 Published by Elsevier Ltd.

Dai J.-R.,Shandong Institute of Geological Survey | Zhu D.-C.,Shandong Institute of Geological Survey | Pang X.-G.,Shandong Institute of Geological Survey | Wang X.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2014

Samples of near-surface atmosphere dust-fall and different pollution end-members were collected in the urban area of Jining City. The element characteristics of the near-surface atmosphere dust-fall and pollution end-members were analyzed systematically and the spatial distribution of the dust-fall and its pollution sources were studied. The results showed that the contents of elements varied obviously in different pollution end-members. The contents of As, Cd, Cu, F, Pb, S and Se within coal dust-fall were the highest, higher than those in atmosphere dust-fall and exerted great influence on the environment. The contents of Cd, Pb, Se, Zn, Hg and CaO within near-surface atmosphere dust-fall were affected by human activities in different degrees. Results of correlation analysis and factor analysis showed that Cd, Pb, Se and Zn mainly came from enterprise coal consumption, with a contribution ratio of 26.32%. The contents of the above four elements near chemical factories, steel factories and high populated regions were generally high, which was consistent with the spatial distribution of the coal pollution sources. CaO was related to traffic pollution, with a contribution ratio of 10.06%. Hg was mainly due to automobile emissions, with a contribution ratio of 8.12%. The contents of As, Cr, F and Ni within dust-fall were seldom influenced by human activities and mainly came from soil sedimentation (natural sources), with a contribution ratio of 30%. The above four pollution sources (enterprise coal consumption, traffic pollution, automobile emissions and soil sedimentation) were the main sources of atmosphere dust-fall in Jining city. The enrichment coefficients of As, Cr, F and Ni were smaller and the spatial correlations of the four elements were better; while the enrichment coefficients and variable coefficients of elements influenced by human activities, such as Cd, Pb, Se and Hg were larger, and the spatial distributions of these elements were consistent with those of the pollution sources.

Lv J.,Nanjing University | Liu Y.,Nanjing University | Zhang Z.,Shandong Normal University | Dai J.,Shandong Institute of Geological Survey
Journal of Hazardous Materials | Year: 2013

The knowledge about spatial variations of heavy metals in soils and their relationships with environmental factors is important for human impact assessment and soil management. Surface soils from Rizhao city, Eastern China with rapid urbanization and industrialization were analyzed for six key heavy metals and characterized by parent material and land use using GIS-based data. Factorial kriging analysis and stepwise multiple regression were applied to examine the scale-dependent relationships among heavy metals and to identify environmental factors affecting spatial variability at each spatial scale. Linear model of coregionalization fitting showed that spatial multi-scale variation of heavy metals in soils consisted of nugget effect, an exponential structure with the range of 12. km (short-range scale), as well as a spherical structure with the range of 36. km (long-range scale). The short-range variation of Cd, Pb and Zn were controlled by land use, with higher values in urban areas as well as cultivated land in mountain area, and were related to human influence; while parent material dominated the long structure variations of these elements. Spatial variations of Cr and Ni were associated with natural geochemical sources at short- and long-range scales. At both two scales, Hg dominated by land use, corresponded well to spatial distributions of urban areas, and was attributed to anthropic emissions and atmosphere deposition. © 2013 Elsevier B.V.

Jia Y.G.,Ocean University of China | Wu Q.,Ocean University of China | Shang H.,Shandong Institute of Geological Survey | Yang Z.N.,Ocean University of China | Shan H.X.,Ocean University of China
Bulletin of Engineering Geology and the Environment | Year: 2011

The effect of contamination by crude oil has been assessed using samples from hand dug trial pits in the Hai-gang region of the Yellow River Delta. In addition to electrical resistivity and in situ penetration tests, grain size analysis, Atterberg limits, compaction, direct shear test and a micro-structure scan were undertaken. The results show that contamination was in the shape of a plume and non-uniform to a depth of 1 m. The more heavily polluted soil had a higher clay particle content, liquid and plastic limit and compression coefficient. However, no notable correlations were found between oil contamination and shear strength parameters. © 2011 Springer-Verlag.

Lv J.,Nanjing University | Lv J.,Bedford Institute of Oceanography | Liu Y.,Nanjing University | Zhang Z.,Shandong Normal University | And 3 more authors.
Journal of Soils and Sediments | Year: 2014

Purpose: Identifying the sources of heavy metals in soils is a crucial issue for soil remediation and management. Most regions in China have been undergoing a rapid industrialization and urbanization since the last three decades. However, there is little information available on the spatial distribution of heavy metals in soils experiencing a rapid transition from agricultural-based to industrial-based economy. To resolve this problem and to provide references on similar regions, we carried out an investigation on heavy metals in soils in Ju country to identify potential sources and to map their spatial distributions.Materials and methods: A total of 646 samples including 511 samples in topsoils (0–20 cm, regular grid of 2 × 2 km2) and 135 samples in subsoils (150–200 cm, regular grid of 4 × 4 km2) were collected in Ju country, and the total contents of Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, V, and Zn were determined. Enrichment factor method and multivariate analyses (correlation analysis, principal component analysis, and cluster analysis) were applied to identify the sources of ten heavy metals in topsoils. Additionally, ordinary kriging was used to map the spatial distributions of heavy metals concentration in topsoils.Results and discussion: The overall levels of all heavy metals did not show high values, but the enrichment factor results suggested that Hg, Cd, Cu, Pb, and Zn in topsoils showed significant accumulation. Ten heavy metals can be grouped into three groups. Co, Cr, Mn, Ni, and V were associated with parent material and seemed to originate from a natural source. Cd, Cu, Pb, and Zn seemed to be related to the combination of parent material and anthropic inputs. Hg as an isolated element was dominated by atmospheric deposition inputs related to various human activities. Distribution maps derived by ordinary kriging suggested that Cd, Cu, Hg, Pb, and Zn were linked to the western part, corresponding well to the surroundings of urban areas located in the western part of Ju country.Conclusions: Hg, Cd, Cu, Pb, and Zn were the main metals affected by human inputs in Ju country, and the high risk resulting from human influence was mainly shown around urban areas, consistent with the spatial distribution of industrial and traffic sites. Agricultural practices did not have significant influence on the spatial distribution of metals. The combination of multivariate analysis and geostatistics was found to be an effective approach to identify the origins and spatial distribution of heavy metals in soils. © 2014, Springer-Verlag Berlin Heidelberg.

Loading Shandong Institute of Geological Survey collaborators
Loading Shandong Institute of Geological Survey collaborators