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1.
Twenty-six groundwater samples were collected from the Eastern Thessaly region and analysed by ICP-ES for these elements: Al, As, P, Pb, Zn, Mn, Fe, Cr, Sb, Cu, Na, Br, Cl, Si, Mg, Ag, Be, Bi, Dy, Er, Eu, Au, Ge, Ho, In, Ir, Os, Pt, Re, Rh, Ru, Lu, Hf, Hg, Tm, Zr and Nb. The objectives of the study were to assess the level of water contamination with respect to the EC and the USEPA health-based drinking water criteria. The geology of the studied area includes schists, amphibolites, marbles of Palaeozoic age, ophiolites, limestones of Triassic and Cretaceous age, Neogene and Quaternary deposits. The element ranges for groundwater samples are: Al 7–56 μg l−1, As 1–125 μg l−1, Br 6–60 μg l−1, Cl 500–25,000 μg l−1, Cr 1–6 μg l−1, Cu 1–15 μg l−1, Fe 10–352 μg l−1, Mg 2,940–40,100 μg l−1, Mn 0–8 μg l−1, Na 3,650–13,740 μg l−1, P 20–48 μg l−1, Pb 0–7 μg l−1, Sb 0–21 μg l−1, Si 3,310–13,240 μg l−1 and Zn 7–994 μg l−1. The results of groundwater analyses from the region of Eastern Thessaly showed elevated concentrations of As and Sb. Factor analysis explained 77.8% of the total variance of the data through five factors. Concentration of Br, Cl, Mg, Na and Si is directly related to the presence of saltwater in the aquifer, so grouping of these variables in factor 1 probably reflects the seawater intrusion. Al, As and Sb are known to form complexes in the environment, so grouping of these elements in factor 2 indicates their similar geochemical behaviour in the environment. The high negative loading of Mn in factor 2 indicates the presence of manganese oxides–hydroxides in the study area. Pb and Zn are associated together in sulphide mineralisation; so grouping of these elements in factor 3 reflects the sulphide mineralization paragenesis in the Melivoia area. P and Cu are associated together in phosphate fertilizers; so grouping of these variables in factor 4 could be related to agricultural practices. Cr, Fe, Mn and Mg are associated together in iron and manganese oxides–hydroxides and the weathering products of the olivine of the ultrabasic rocks; so grouping of these elements in factor 5 reflects the lithology of the area. There is a natural contamination of groundwaters with elevated concentrations of As and Sb due to the presence of the arsenopyrite and stibnite mineralisation in the Melivoia, Sotiritsa and Ano Polydendri areas. Contamination over the health-based drinking water guidelines given by EC and EPA has been investigated from nine sampling sites out of 26 of Eastern Thessaly region. 相似文献
2.
Rumex acetosella and Minuartia verna are confined to mineralized ground in Macedonia. These plants contain relatively high concentrations of heavy metals such as copper, zinc, lead and manganese, and are to that extent, valuable indicators of sulphide mineralization, either pyrite + chalcopyrite or pyrite + chalcopyrite + sphalerite + galena. There is a direct relationship between the metal content of the plant ash and the metal content of the soils and mineralized substrate. 相似文献
3.
Akindynos Kelepertsis Evangelos Tziritis Eustratios Kelepertzis Giorgos Leontakianakos Kostas Pallas 《Central European Journal of Geosciences》2009,1(3):241-250
Edipsos area, situated in northern Euboea, has been well known since ancient times for the existence of thermal springs. In order to assess the hydrogeochemical conditions, thermal and cold water samples were collected and analyzed by ICP method for major and trace elements. The results revealed the direct impact of seawater, a process which is strongly related to the major tectonic structures of the area. Seawater impact was confirmed by the Cl/Br and Na/Cl ionic ratios, as well as from statistical processing and graphical interpretation of the analytical results, which classified the sampled waters into three groups (two for cold waters and one for the thermal ones). Trace element ranges for thermal waters are: As (44–84 ppb), Pb (23–154 ppb), Ag (1–2 ppb), Mn (31–680 ppb), Cu (61–97 ppb), Cs (66–244 ppb), Se (0–76 ppb), Li (732–3269 ppb), Fe (0–1126 ppb), Sr (14000–34100 ppb), B (4300–9600 ppb). Compared with the chemical composition of other thermal springs from the Hellenic Volcanic Arc, Edipsos thermal waters are enriched in Ca2+, Na+, Cl?, SO4 2?, Li, B and K+, reflecting the influence from seawater. Cold waters are free of heavy metals compared with other natural waters and are characterized by good quality based on the major element chemistry. Finally, several geothermometers were applied in order to assess the reservoir temperatures, but none of them appear to be applicable, mainly due to the impact of seawater on the initial hydrogeochemistry of the geothermal fluids. 相似文献
4.
A.KELEPERTSIS 《中国地球化学学报》1996,15(1):20-32
A Tertiary non-marine stratigraphic sequence composed of carbonates(limestone),siliceous carbonates,coaly layers overlain by pyroclastic rocks and lavas,outcrops in the Gavatha area of northwestern Lesvos Island.Pure earbonates eonsist almost completely of calcite,the siliceous carbonate sediments of quartz,opal-CT and calcite,the shales of quartz,opal CT, K-feldspar,smecite-illite and ealcite,and the coaly layers of organic matter,quartz,opal-CT,feldspars and pyrite,Geochemical data indicate that smectite-illite,feldspars and associated elements(La,Zr,Y,Ba,Ce)are the products of alteration of volcanic rocks in a subtropical area A combination of sources in suggested for the formation of silica polymorphs:(a) biogenic or non-biogenic silica(opal-A) that was originally present in the form of diatiom frustules of in the form of inorganically prccipitated silica;(b)transformation o opall-A to opal-CT and quartz opal-C from alteration of volcanic glass of intercalated tuffites and overlying volcanics;and(c)opal-CT deposited primarily from hydrothermal solutions. 相似文献
5.
Panagiotis T. Nastos Dimitrios Alexakis Helen A. Kanellopoulou Akindinos E. Kelepertsis 《Journal of Atmospheric Chemistry》2007,58(2):167-179
The goal of this study is to determine the chemical composition of rain, in the wider region of Athens, Greece for the time
period 1st September 2001 to 31st August 2002. Two model automatic rain samplers were installed in the Meteorological Station
of Laboratory of Climatology (latitude: 37° 58′ N, longitude: 23° 47′ E) inside the Athens University Campus and in a site
at Heraklio Attica, a northern suburb of Athens (latitude: 38° 03′ N, longitude: 23° 45′ E). The concentrations (μeq l−1) of the major cations (H+, Na+, K+, Ca2+ and Mg2+) and anions (Cl−, , και ), as well as pH and conductivity of rain in 39 total samples were determined. The figures of pH range from 6.4 to 8.4 and
conductivity from 8 to 207 μS cm−1. The analysis showed that Ca2+ ions are abundant within all examined samples, while and present the highest concentrations from the anions. In order to find out the origin of the air masses, the air mass back
trajectories were calculated. Five sectors of the origin of air masses were revealed: the North, the South, the Local, the
West and the East sector. Multivariate methods included Factor Analysis and Discriminant Analysis were applied to the examined
ion concentrations and three main factors were extracted, which discriminated the ions according to their origin. The first
group of ions is interpreted as the result of the anthropogenic activity, the second group represents the acidity–alkalinity
independently of their source and the third one the marine influence. 相似文献
6.
7.
A.E.KELEPERTSIS 《中国地球化学学报》2002,21(3):193-205
A nickel laterite deposit occurs in the Vatera area of Lesvos Island,Greece ,and is transgressively developed on serpentinized basic rock (norite).The overlying sedimentary rocks include marls and marly limestones with sandstone intercalations and belong to the Pliocene sed-iments.The following alteritic zones are defined from the bottom to top layers:a)bedrock (norite);b)serpentinized zone;c)goethitic zone.The bedrock consists of the following pri-mary minerals:basic plagioclase,orthopyroxenes and clinopyroxenes.The serpentinized zone includes clinochrysotile,lizardite,antigorite clinoenstatite,calcite and dolomite while in the goethic zone there are goethite,quartz,pyrite,chromite,dolomite.Al2O3 ,Fe2O3,CaO,Na2O,K2O,Ba,Sr,Ni,C and S are enriched in the goethitic zone .Nickel enrichment is re-lated to the formation of nickeliferons minerals substituting for Mg or/and Fe in the goethite and pyrite.Enrichment of Ni in the matrix may be due to the presence of amorphous Ni-sili-cates(pimelite).There is a significant change(decrease)in the concentration of Ni from the top to bottom parts of the laterite formation,indicating that there was no tendency to migrate downwards(immature laterite).A second support of the immaturity of the Vatera laterite is the incomplete oxidation of ferrous iron to form ferric iron hydroxides.Under tropical/subtropical conditions,which dominated from the end of Miocene to the Pliocene the norite rocks of the Vatera area altered in response to reaction with acid solutions enriched in CO2.Due to hydrolysis and oxidation of pyroxenes,Mg^2 ,H4SiO4 and Ni^2 were removed in the continental acid solutions. 相似文献
8.
Dr. A. E. Kelepertsis E. Chatsidimitriadis 《International Journal of Earth Sciences》1983,72(1):167-190
Detailed chemical and mineralogical data are presented for 37 samples of surface sediments collected from the Kalloni gulf, (eastern half), Lesvos island, northern Greece. The sediments are largely carbonate-rich muds, though near the eastern and northern coast of the gulf higher proportions of biogenic and lithogenic sands and gravels occur. The main minerals are quartz, feldspar (andesine), clay minerals (montmorillonite, illite, Kaolinite) and the carbonate minerals (calcite, Mg-calcite, aragonite). The mathematical method of factor analysis was applied in order to explain the mineralogical and geochemical variations. These variations can be interpreted in terms of variations in provenance and depositional environment. Six factors were produced accounting for 83.6 % of the total data variance: (a) a Si-Al-Na-K-Ti-Rb-Ba-Y-Zr factor controlled by clays and detrital minerals such as feldspars and zircon opposed by a CaCO2-Cu-Sc-Sr-La association (carbonate, minerals), (b) an organic carbon factor (C-Fe-Ce-Zn-Rb-Ni-Y-Nb), (c) a Fe-Mg-Cr-Ni factor representing control by peridotite, (d) a Ce-Nd-Fe-Ni-Zn-La factor controlled by silicate minerals, (e) a Al-Fe-Ti-P-V factor controlled by chlorite amphiboles or pyroxenes of volcanic or basaltic intrusions, (f) a Mn-Fe-Zn-factor controlled by iron-manganese oxides. Similarities in trace element composition among Kalloni gulf bottom sediments, and source lithologies indicate that the trace elements are derived from the adjacent landmasses. The AI/Ti ratio of the sediments is consistent with the terrigenous nature of sendimentation in the Kalloni gulf. 相似文献
9.
Hydrothermal quartz veins associated with gold and silver mineralization and variable amounts of base metal sulfides have been discovered within an active geothermal system in the Megala Therma area of northern Lesbos. This geothermal system is probably a late evolutionary stage in the formation of this mineralization. The veins are hosted in Upper Miocene volcanic rocks of andesitic composition and consist of quartz, adularia, chlorite, sericite, illite, kaolinite, baryte, small amounts of jarosite and alunite, and native gold, pyrite, galena, sphalerite, chalcopyrite, bornite, chalcocite, covellite and goethite. The principal types of alteration which occur in the studied area are: silicification, propylitization, argillic alteration and potassic, phyllic alteration. 相似文献
10.
Environmental research of groundwater in the urban and suburban areas of Attica region,Greece 总被引：4，自引：0，他引：4
G. D. Bathrellos H. D. Skilodimou A. Kelepertsis D. Alexakis I. Chrisanthaki D. Archonti 《Environmental Geology》2008,56(1):11-18
In this study, 92 groundwater samples were collected from the Attica region (Greece). Moreover, geographical information system
database, geochemistry of groundwater samples and statistics were applied. These were used for studying the chemical parameters
(NO3
−, Mg2+, Ca2+, Cl−, and Na+) and conductivity spatial distribution and for assessing their environmental impact. The ranges of chemical parameters of
the water samples (in mg L−1) are: NO3
− 1–306, Mg2+ 2–293, Ca2+ 3–453, Cl− 5–1,988, and Na+ 4–475. The elevated concentrations of sodium, Mg2+, Cl− are attributed to natural contamination (seawater intrusion). On the other hand, NO3
− elevated concentrations are attributed to anthropogenic contamination (nitrate fertilizers). The results of the GIS analysis
showed that elevated values of Na+, Mg2+, Cl− are related to shrubby and sparsely vegetated areas, while elevated values of NO3
− are connected with urban and agricultural areas. 相似文献