Development of peri-urban catchment hydrological model with the multi-outlet approach

The peri-urban catchments are distinguished by discontinuous urban extensions. They extend between the margins of the city and the borders of the rural space forming a mid-urban, mid rural mosaic. They experience unprecedented expansion movement since the end of the 60 years. When hydrological models for urban and for rural catchments have been developed, it was until recently impossible to apply those principles in a concrete manner to peri-urban catchments. The representation of the hydrological functioning of these surfaces can be done by considering both urban processes and rural processes. In this paper, we present the simulation model named “Multi-Outlets model”. This model allows taking into account the mixed nature of peri-urban areas. The model was applied to Yzeron catchment located in Lyon, France.     

Alteration of naruo porphyry Cu (Au) deposit in the duolong ore-concentration area,tibet北大核心CSCD

The Naruo Cu( Au) deposit is a large porphyry deposit in Bangonghu-Nujiang suture, and it is an important part of Duolong ore •concentration area. In this study, alteration and mineralization zoning were constrained by detailed field investigation and indoor petrography observation in order to characterize the alteration and establish alteration-zoning model for exploration. The deposit has typical porphyry hydrothermal alteration system with successively alteration zoning of potassium silicate zone( with later propylitization) to sericite zone( with later propylitization) , propylitic zone, and hornfel zone from inner outward. The mineralization is closely related to potassium silicification and sericitization.     

The spatial-Temporal distributions and migrations of mesozoic magmaism in South China and subduction process of the paleo-pacific plate北大核心CSCD

The spatial-Temporal distributions and migrations of Mesozoic magmatism suggest that Mesozoic igneous rocks in South China can be divided into "two regions and four belts" , which are thought to be the products of convergence of multiple blocks as well as multi-stages and multi-directional compressional-extensional orogeny. However, it is impossible that the single subduction of the paleo-Pacific plate to form multi-direction and wide( > I (KK) km) tectonic deformation and mag- matic rock belt. In this paper. We evaluated the model of the paleo-Pacific Plate subduction, which widely circulated on late Mesozoic magmatism in Cathaysian Block at present, to address the its main contribution and shortage. We put forward that approximately middle-Jurassic( 175±5 Ma) , the South China entered the paleo-Pacific tectonic system, roughly from south to north oblique subduction of the paleo-Pacific Plate. After 120 Ma, the subduction direction of paleo-Pacific Plate has changed to westward forward subduction dramatically. At the end of Mesozoic, the South China continent has become a passive margin so that there are the different tectonic setting roughly contemporary in southeastern China coast and east- em Taiwan. The former is the within-continent tectonic environment of the extensional-break up setting, where as and the latter is the arc tectonic environment with collision-compresive stress.     

The petrologic characteristics of carbonaceous shale and its significance of shale (las. Lucaogou formation,southern junggar basin北大核心CSCD

In the margin of southern Junggar basin, there is a potential of shale gas with the upper Permian l.uoaogou Formation. For a detailed understanding and evaluation with the shale gas geological characteristics of l.uoaogou Formation, the petrologic characteristics of the carbonaceous shale was researched, and the results show that: ( 1 ) in l.ucaogou Formation, the mean value of the brittle mineral percentages of the upper member, the middle member and the lower member are all more than 50%, but it is the highest in the middle member, and it is second in the lower member. At the same time, in the lower member, the mean value of the brittle mineral percentages is significantly lower than the upper and middle members; (2)the main brittle mineral in each member are quartz+feldspar, and there is a same change rule between the quartz+feldspar content and the total brittle mineral, that is; The quartz + feldspar content is the highest in the middle member, followed with the lower member, and it is obviously low in the upper member; (3 )from the lower member to the upper member, the content of carbonate in the carbonaceous shale are gradually reduced; (4) the clay mineral content of the carbonaceous shale of the upper member is far higher than the lower and middle members. And the clay mineral in each member are mainly constituted with illite and illite/Mongolia inter layer; ( 5 ) in the northern margin of the western part of the Bogda Mountain, south Junggar Basin, the brittle mineral content of the carbonaceous shale generally present as a decreasing trend from west to east to Fu Rang.     

Microscopic Pore characteristics and methane sorption capacity of the lower cambrian shales in yangtze platform北大核心CSCD

The lower Cambrian develops a set of organic-rich black shales in Yangtze Platform and is regarded as one of the key layers of shale gas exploration. The microscope pore structure characteristics and methane sorption capacity were investigated using scanning electron microscope, nitrogen adsorption and methane sorption experiments, and then their controlling factors combining with organic matter, mineral compositions were discussed for Niutitang shales in Zunyi area, Mufushan shales in Nanjing area and Huangboling shales in Chizhou area. The results show as below; ( I ) The pores in lower Cambrian shales are mainly dominated by organic pores, interlayer pores in clay minerals and micro-fractures, as well as containing some intergranular pores between brittle mineral grains, honeycomb poies formed by pyrite crystals falling out, and dissolution molds in fossils; ( 2) DKT pore size distributions show the pores is mainly concentrated in the range of less than 4 nm in lower Cambrian shales and kerogens, while a certain amount of pores are above 4 nm are also existed in lower Cambrian shales, which may be contributed by smectite; ( 3)The specific surface area, pore volume and Langmuir methane sorption capacity of the lower Cambrian shales are ranging from 5.58 to 31. 96 inVg, 0.026 to 0.088 mL/g and 1.36 to 5. 3 mL/g, respectively, which are mainly controlled by TOC and smectite contents, but the effect of TOC and smectite on physical properties are quite different for the lower Cambrian shales in different regions; ( 4)The specific surface area of two Niutitang kerogens are 7. 08 and 7. 92 times than that of the shales and methane sorp-Tion capacity of kerogens arc 5.81 and 7.09 times than that of the shales, suggesting that kerogen is a main carrier of methane gas occurrence in.     

Nd isotope systematics of the Vendian–Early Cambrian sedimentary ores in the northern segment of the Paleoasian Ocean

Isotope–geochemical studies of Mn, P, and Ba ores were performed in order to establish the influence of submarine hydrotherms on the formation of Early Cambrian sedimentary rocks of the southern environs of the Siberian Platform. Based on study of the geochemical and isotope (ε_Nd) characteristics of the shallow-water Mn and Ba ores and phosphorites of southern environs of the Siberian Platform with similar ages, two types of sedimentary basins of the different geodynamic origins were distinguished: intraplate oceanic and those of the active continental margin, for which the sources of ore materials differ by the proportions of the mantle and contaminated crustal matter.     

Contents,seasonal variations,and forms of migration of major and minor elements in surface waters in the area of the Tyrnyauz Tungsten–Molybdenum Combine (TTMC) and adjacent areas (Kabardino-Balkarian Republic,Russian Federation) and actions for recovery of the ecological environment

Anomalous concentrations of numerous major and minor elements significantly exceeding the threshold limit values (TLV) for drinking water were registered in the area of the Tyrnyauz Tungsten–Molybdenum Combine (TTMC). The maximal excess of the TLV (by one or two orders of magnitude) were obtained for Mo (up to 11 mg/L), W (4.4 mg/L), As (1.5 mg/L), Mn (8.4 mg/L), and Tl (up to 3.3 μg/L) in water of the Bolshoi Mukulan Brook flowing through the mines and three brooks flowing out from the base of the embankment of the tailing store no. 1. They are the major pollutants for water of the Baksan River. Upon flowing out to the plain, water of the Baksan River shows significant excess of the TLVs (in summer) for Al, Fe, Mn, Be, Si, Ti, Tl, and Hg.     

Evidence for the zircon origin of cadmium anomalies in bottom sediments from the littoral zone of the northern part of Lake Ladoga

The minor-element composition of bottom sediments from the littoral zone of the northern part of Lake Ladoga was studied. Close relationships between the anomalous Cd concentrations in lake sediments and Quaternary glacial formations on the territory of Karelia were shown. A negative correlation of Cd with other heavy metals and a positive correlation with Zr were observed. Most likely, Cd is an impurity in zircons from sandy and sandy loam sedimentary formations on the northern coastal area of Lake Ladoga.     

Mineral CuFe<Subscript>2</Subscript>S<Subscript>4</Subscript> from sulfide Copper–Nickel ores of the Lovnoozero deposit,Kola Peninsula

The unnamed mineral CuFe₂S₄ has been found from sulfide Cu–Ni ores of the Lovnoozero deposit in the Kola Peninsula, Russia. It occurs in norite composed of orthopyroxene (bronzite), Ca-rich plagioclase (66% An), pargasite, and phlogopite. The last two minerals are replaced by talc, chlorite and carbonates. Monoclinic pyrrhotite, pentlandite, chalcopyrite, and pyrite are associated ore minerals. Phase CuFe₂S₄ is enclosed predominantly in chalcopyrite, probably replacing it, and occurs in later carbonate veinlets together with redeposited sulfides. It is light yellow with a brownish tint and metallic luster. The Mohs hardness is 5–5.5; VHN 654 ± 86 kgs/mm². Density (calc.) = 4.524 g/cm³. The mineral is anisotropic, internal reflections are absent. Reflectance values (λ, nm R′ _g and R′ _p %) are: 440 30.3 29.5, 500 43.7 42.8, 560 50.9 49.6, 620 52.4 51.2, 640 52.6 51.4, 680 52.8 51.6, 700 52.7 51.4. CuFe₂S₄ is monoclinic, a = 6.260(4), b = 5.39(1), c = 13.19(1) Å, β = 94.88(7)°, V = 443(1) ų, Z = 4. The strongest reflections in the powder diffraction pattern are [d, Å (I) (hkl)]: 4.150 (10) (012), 3.559 (4) (\(11\bar 2\)), 3.020 (4) (\(10\bar 4\)), 2.560 (3) (\(21\bar 2\)), 2.500 (3) (\(10\bar 5\)), 2.340 (3) (\(12\bar 2\)), 1.817 (3) (215), 1.489 (3) (402). The chemical composition is as follows, wt %: 20.44 Cu, 35.85 Fe, 0.65 Ni, 0.14 Co, 43.15 S, total is 100.23. The empirical formula calculated on the basis of 7 atoms is Cu_0.969(Fe_1.934Ni_0.034Co_0.007)_1.975S_4.056. According to its mode of occurrence, the mineral was formed as a result of low temperature processes involving metamorphic hydrothermal solutions.