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Song M.,Bureau of Mineral Resources | Yi P.,Bureau of Mineral Resources | Xu J.,Bureau of Mineral Resources | Cui S.,No 6 Exploration Institute Of Geology And Mineral Resources | And 4 more authors.
Science China Earth Sciences | Year: 2012

Based on our study of the nature and variation of mineralization-controlling faults in their deep extension and the spatial distribution of gold orebodies in the northwestern Shandong Peninsula (NSP), here we propose that the gold deposits in the Jiaojia gold belt are controlled by listric faults and the gold deposits in the NSP are controlled by extensional fault system. We also suggest that there is a multiple mineralization space in the deep part of the NSP gold belt. As steps or benches occur along the deep extention of the listric fault where its dipping angle changes from steep to gentle, a number of gold deposits are correspondingly distributed as a steplike pattern, which is named as a step metallogenetic model for gold deposits in the NSP. The gold deposits in Shandong Peninsula were formed in the Cretaceous when the crust in the region experienced extention and thinning following the strong collision between North China Plate and Yangtze Plate during the Triassic. Crust anataxis, fluid remobilization, and extention-detachement of the crust are the leading factors for the gold mineralization. © 2012 Science China Press and Springer-Verlag Berlin Heidelberg. Source


Tian H.,Shandong Jianzhu University | Zhang Z.,Shandong Institute and Laboratory of Geological science | Zhang B.,Shandong Jianzhu University | Zhang B.,Shandong Normal University | And 3 more authors.
Acta Geologica Sinica | Year: 2013

The Yishu fault zone (mid-segment of the Tanlu fault zone) was formed in the Presinian. Periodic tectonic activities and strong seismic events have occurred along the fault zone. During the initial stage of the Caledonian Movement, with the proceeding of the marine transgression from the Yishu paleo-channel to the western Shandong, uneven thick sediments, composed mainly of sand, mud and carbonates of littoral, lagoon, and neritic facies, were deposited in the Yishu fault zone and western Shandong, and constructed the bottom part of the Lower Cambrian consisting of the Liguan and Zhushadong formations. Through field observations and the lab-examinations, various paleoseismic records have been discovered in the Liguan Formation and the Zhushadong Formations of the Yishu fault zone and its vicinity, including some layers with syn-sedimentary deformation structures that were triggered by strong earthquakes (i.e. seismite, seismo-olistostrome, and seismo-turbidite). Paleoseismic records developed in the Zhushadong Formation are mainly seismites with soft-sediment deformation structures, such as liquefied diapir, small liquefied-carbonate lime-mud volcano, liquefied vein, liquefied breccia, convolute deformation (seismic fold), graded fault, soft siliceous vein, and deformation stromatolite, as well as seismites with brittle deformation structures of semiconsolidated sediments. Paleoseismic records preserved in the Liguan Formation are not only seismo-olistostrome with a slump fold, load structure, and ball-and-pillows, but also seismo-turbidite with convolution bedding, graded bedding and wavy-bedding. However, in the western Shandong area, the closer to the Yishu fault zone, the greater the thickness of the Liguan Formation and the Zhushadong Formation, the greater the number and type of layers with paleoseismic records, and the higher the earthquake intensity reflected by associations of seismic records. This evidence indicates that tectonic taphrogenesis accompanied by strong earthquake events occurred in the Yishu fault zone during the initial stage of the Caledonian Movement, which embodied the break-up of the Sino-Korean Plate along the Paleo-Tanlu fault zone at that time. Source


Zhang G.,Shandong University | Pan Z.,Shandong Institute and Laboratory of Geological science | Hou X.,Shandong University | Wang X.,Shandong University | Li X.,Shandong University
Environmental Earth Sciences | Year: 2014

The concentrations of heavy metals (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) were investigated in water, sediment and biota (aquatic plant, fish and shrimp) of Nansi Lake by an inductively coupled plasma-atomic emission spectrometry. The lower concentrations of heavy metals in lake water and the higher concentrations of heavy metals in sediment implied that there were low-level, persistent inputs of heavy metals in the Nansi Lake. The concentrations of Cr and Fe in aquatic plants exceeded their corresponding toxic concentrations. The correlations among the concentrations of heavy metals in water, sediment, aquatic plants and animals were lower. The factor analysis and the correlation analysis of different heavy metals in water, sediment and aquatic biota samples showed that most heavy metals had the same source except As. This finding implied that As was of different source compared to the other heavy metals in Nansi Lake. The comparison of heavy metals in different samples from upper lake and lower lake showed that the contamination of heavy metals in upper lake was more serious than that in lower lake. The intensive coal mining and more coal thermal plants were an important reason leading to contamination of heavy metals in Nansi Lake. The heavy metals in aquatic organisms were not accumulated along food web except As and Zn. There was a positive correlation between the accumulation of As and Zn and food web based on bioaccumulation factors value in Nansi Lake. Risk assessment of heavy metals in water, sediment and animals indicated that the water environment of Nansi Lake is safe at present. However, people should pay more attention to the intake of As and Zn. © 2014 Springer-Verlag Berlin Heidelberg. Source


Li X.,Shandong University of Science and Technology | Liu Y.,Shandong University of Science and Technology | Guo J.,CAS Institute of Geology and Geophysics | Li H.,Shandong Institute and Laboratory of Geological science | Zhao G.,University of Hong Kong
Acta Petrologica Sinica | Year: 2013

The Paleoproterozoic HP mafic granulite and calc-silicate were found from Laixi, Jiaobei terrane, consisting of almandine dominated garnet-augite- ferrohypersthene and grossular-zoisite-prehnite-albite respectively. Mineralogical and petrological studies show that the calc-silicate formed after the HP mafic granulite by processes combined retrogressive metamorphism with Ca alteration. The HP mafic granulites records four stage geological processes, including pre-granulite facies, peak granulite facies, retrogressive combined with Ca alteration and complete Ca alteration processes with mineral assemblages as Cpx + PI + Qtz (M1), Grt + Cpx + Rt + Qtz (M2), Cpx + PI + Opx + Ilm + Mgt + Ep (M3) and Grs + Zo + Prh + Ab + Cal (M 4). The HP mafic granulite is rich in LIL elements Ba, Rb, K, Rb, Th and depleted in HFS elements Nb, Zr, Ti and Y, having LREE rich right-inclined REE pattern and showing island-arc basaltic characteristics. Further studies by using discrimination diagrams, the HP mafic granulite presents island-arc tholeiitic characteristics, probably formed in the back-arc extension tectonic setting. After formation of the mafic rock, it experienced granulitic facies metamorphism during collisional convergence of the Jiao-Liao-Ji orogenic belt and afterwards experienced retrogressive and Ca alteration processes during the lift of the belt. Source


Zhang G.,Shandong University | Pan Z.,Shandong Institute and Laboratory of Geological science | Bai A.,Centers for Disease Control and Prevention | Li J.,Shandong University | Li X.,Shandong University
Environmental Monitoring and Assessment | Year: 2014

The concentration of 12 organochlorine pesticides (OCPs) were measured in water, sediment, aquatic plant, and animal (shrimp and fish) of Nansi Lake by gas chromatography equipped with an electron capture detector. The total OCPs concentrations were 65.31-100.31 ng L-1 in water, 2.9-6.91 ng g -1 dry weight (dw) in sediments, 1.29-6.42 ng g-1 dw in aquatic plants and 7.57-17.22 ng g-1 dw in animals. The OCPs composition profiles showed that heptachlor compounds was also the predominant OCPs contaminants in addition to hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in Nansi Lake. According to the source of HCHs and DDTs in sediment samples, there was no new input and the HCHs pollution mainly came from the use of Lindane in Nansi Lake. Bioaccumulation of OCPs in aquatic biota indicated that DDTs and heptachlor compounds had a strong accumulation, followed by HCHs and drins. The accumulation abilities of fish for OCPs were higher than those of plants and shrimps. The OCPs biota-sediment accumulation factor values of Channa argus was the highest in fish samples, followed by Carassius auratus, and Cyprinus caspio. Risk assessment of sediment showed that heptachlor epoxide had a higher occurrence possibility of adverse ecological effects to benthic species. Based on the calculation of acceptable daily intake and hazard ratio, HCHs in fish and shrimps from Nansi Lake had a lifetime cancer risk of greater than one per million. The risk assessment of water, sediment, and fish indicated the water environment of Nansi Lake is at a safe level at present. © 2013 Springer Science+Business Media. Source

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