Хх симпозиум по геохимии изотопов им. Виноградова А. П. 12-14 ноября 2013 года




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ХХ Симпозиум по геохимии изотопов им. Виноградова А.П.

12-14 ноября 2013 года

1. INVESTIGATION OF PRODUCTION OF THE THERAPEUTIC RADIOISOTOPE 165ER BY PROTON INDUCED REACTIONS ON ERBIUM IN COMPARISON WITH OTHER PRODUCTION ROUTES
Tárkányi F., Takács S., Ditrói F., Király B., Hermanne A., Baba M., Ohtsuki T., Kovalev S.F., Ignatyuk A.V.
Applied Radiation and Isotopes. 2009. Т. 67. № 2. С. 243-247.

2. LIMITATION OF THE LONG-LIVED 121TE CONTAMINANT IN PRODUCTION OF 123I THROUGH THE 124XE(P,X) ROUTE


Hermanne A., Adam Rebeles R., Tarkanyi F., Takacs S., Ignatyuk A., Spellerberg S., Schweikert R.
Applied Radiation and Isotopes. 2011. Т. 69. № 2. С. 358-368

3. HIGH YIELD PRODUCTION OF THE MEDICAL RADIOISOTOPE 167TM BY THE 167ER(D,2N) REACTION


Hermanne A., Adam Rebeles R., Tárkányi F., Takács S., Spahn I., Ignatyuk A.V.
Applied Radiation and Isotopes. 2011. Т. 69. № 2. С. 475-481.

4. Zaichick S., Zaichick V.


TRACE ELEMENTS OF NORMAL, BENIGN HYPERTROPHIC AND CANCEROUS TISSUES OF THE HUMAN PROSTATE GLAND INVESTIGATED BY NEUTRON ACTIVATION ANALYSIS//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 81-87.

5. Tárkányi F., Takács S., Ditrói F., Hermanne A., Spahn I., Ignatyuk A.V.


ACTIVATION CROSS-SECTIONS OF PROTON INDUCED NUCLEAR REACTIONS ON THULIUM IN THE 20-45MEV ENERGY RANGE//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 309-314

6. Al-Abyad M., Abdel-Hamid A.S., Seddik U., Tárkányi F., Ditrói F., Takács S., Bashter I.I.


CROSS-SECTION MEASUREMENTS AND NUCLEAR MODEL CALCULATION FOR PROTON INDUCED NUCLEAR REACTION ON ZIRCONIUM//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 257-262.

7. Krmar M., Jovančević N., Nikolić D.


MEASUREMENT OF56FE ACTIVITY PRODUCED IN INELASTIC SCATTERING OF NEUTRONS CREATED BY COSMIC MUONS IN AN IRON SHIELD//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 269-273

8. Chao J.H., Lee H.P., Lee M.C., Chiu Y.J.


DEPOSITION OF BERYLLIUM-7 IN HSINCHU, TAIWAN//
Applied Radiation and Isotopes. 2012. Т. 70. № 2. С. 415-422

9. Rossouw D.D., Breeman W.A.P.


SCALED-UP RADIOLABELLING OF DOTATATE WITH68GA ELUTED FROM A SNO2-BASED68GE/68GA GENERATOR//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 171-175.

10. Zlatopolskiy B.D., Kandler R., Neumaier B., Mottaghy F.M.


C-(4-[18F]FLUOROPHENYL)-N-PHENYL NITRONE: A NOVEL18F-LABELED BUILDING BLOCK FOR METAL FREE [3+2]CYCLOADDITION//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 184-192.

11. Wong R., Iwata R., Furumoto S., Ishikawa Y., Saiki H., Ozeki E.


REACTIVITY OF ELECTROCHEMICALLY CONCENTRATED ANHYDROUS [18F]FLUORIDE FOR MICROFLUIDIC RADIOSYNTHESIS OF18F-LABELED COMPOUNDS//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 193-199

12. Koźmiński P., Gniazdowska E., Fuks L., Kowalska S.


'2+1' TRICARBONYLTECHNETIUM(I)/TRICARBONYLRHENIUM(I) MIXED-LIGAND COMPLEXES WITH METHYL THIOSALICYLATE AND ISOCYANIDE LIGANDS AS POTENTIAL PRECURSORS OF RADIOPHARMACEUTICALS//
Applied Radiation and Isotopes. 2011. Т. 69. № 2. С. 436-442

13. Melquiades F.L., Parreira P.S., Appoloni C.R., Silva W.D., Lopes F.


QUANTIFICATION OF METALS IN RIVER WATER USING A PORTABLE EDXRFSYSTEM//
Applied Radiation and Isotopes. 2011. Т. 69. № 2. С. 327-333.

14. Baccouche S., Trabelsi A., Al-Azmi D., Karunakara N.


APPLICATION OF THE MONTE CARLO METHOD FOR THE EFFICIENCY CALIBRATION OF CSI AND NAI DETECTORS FOR GAMMA-RAY MEASUREMENTS FROM TERRESTRIAL SAMPLES//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 227-232

15. Konki J., Greenlees P.T., Jakobsson U., Jones P., Julin R., Juutinen S., Ketelhut S., Hauschild K., Lopez-Martens A., Nieminen P., Nyman M., Peura P., Rahkila P., Ruotsalainen P., Sarén J., Scholey C., Sorri J., Uusitalo J., Kontro R., Mattila A. et al.COMPARISON OF GAMMA-RAY COINCIDENCE AND LOW-BACKGROUND GAMMA-RAY SINGLES SPECTROMETRY//


Applied Radiation and Isotopes. 2012. Т. 70. № 2. С. 392-396.

16. Nilchi A., Saberi R., Rasouli Garmarodi S., Bagheri A.


EVALUATION OF PAN-BASED MANGANESE DIOXIDE COMPOSITE FOR THE SORPTIVE REMOVAL OF CESIUM-137 FROM AQUEOUS SOLUTIONS//
Applied Radiation and Isotopes. 2012. Т. 70. № 2. С. 369-374.

17. Crespo M.T.


A REVIEW OF ELECTRODEPOSITION METHODS FOR THE PREPARATION OF ALPHA-RADIATION SOURCES//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 210-215

18. Patil B.J., Bhoraskar V.N., Dhole S.D., Chavan S.T., Pethe S.N., Krishnan R.


DESIGN OF 6MEV LINEAR ACCELERATOR BASED PULSED THERMAL NEUTRON SOURCE: FLUKA SIMULATION AND EXPERIMENT//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 149-155.

19. Borhani zarandi M., Amrollahi Bioki H., Mirbagheri Z.-A., Mirjalili G., Tabbakh F.


EFFECT OF CRYSTALLINITY AND IRRADIATION ON THERMAL PROPERTIES AND SPECIFIC HEAT CAPACITY OF LDPE & LDPE/EVA//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 1-5.

20. Alharbi A.A., Azzam A.


THEORETICAL CALCULATIONS OF THE REACTION CROSS-SECTIONS FOR PROTON-INDUCED REACTIONS ON NATURAL COPPER USING ALICE-IPPE CODE//
Applied Radiation and Isotopes. 2012. Т. 70. № 1. С. 88-98

21. Jörg G., Lierse v. Gostomski C., Amelin Y., Kossert K.PRECISE AND DIRECT DETERMINATION OF THE HALF-LIFE OF41CA//


Geochimica et Cosmochimica Acta. 2012. Т. 88. С. 51-65.

22. Biegalski S.R., Saller T., Helfand J., Biegalski K.M.F.


SENSITIVITY STUDY ON MODELING RADIOXENON SIGNALS FROM RADIOPHARMACEUTICAL PRODUCTION FACILITIES//
Journal of Radioanalytical and Nuclear Chemistry. 2010. Т. 284. № 3. С. 663-668.

23. Rivals I., Fabbri C., Euvrard G., Blanchard X.


A BAYESIAN METHOD WITH EMPIRICALLY FITTED PRIORS FOR THE EVALUATION OF ENVIRONMENTAL RADIOACTIVITY: APPLICATION TO LOW-LEVEL RADIOXENON MEASUREMENTS
Journal of Radioanalytical and Nuclear Chemistry. 2012. Т. 292. № 1. С. 141-153

24. Wan Mahmood Z.U., Yii M.-W.


MARINE RADIOACTIVITY CONCENTRATION IN THE EXCLUSIVE ECONOMIC ZONE OF PENINSULAR MALAYSIA:226RA,228RA AND228RA/226RA//
Journal of Radioanalytical and Nuclear Chemistry. 2012. Т. 292. № 1. С. 183-192.

25. Gledenov Yu.M., Sedysheva M.V., Zhang G., Liu J., Wu H., Liu X., Chen J., Khuukhenkhuu G., Szalanski P.J., Koehler P.E.


CROSS-SECTION MEASUREMENT AND ANALYSIS FOR THE SM149(N,α)ND146 REACTION AT 6.0 MEV//
Physical Review C - Nuclear Physics. 2010. Т. 82. № 1. С. 014601.

26. Stochioiu A., Bercea S., Sahagia M., Ivan C., Tudor I., Celarel A.THE MEASUREMENT OF THE NATURAL RADIATION BACKGROUND IN A SALT MINE//Romanian Journal in Physics. 2011. Т. 56. № 5-6. С. 757-761

27. Семинский К.Ж., Бобров А.А.
СРАВНИТЕЛЬНАЯ ОЦЕНКА РАДОНОВОЙ АКТИВНОСТИ РАЗНОТИПНЫХ И РАЗНОРАНГОВЫХ РАЗЛОМОВ БАЙКАЛЬСКОГО РИФТА И ЮГА СИБИРСКОЙ ПЛАТФОРМЫ//
Доклады Академии наук. 2009. Т. 427. № 4. С. 521-525.

28. Семинский К.Ж., Дэмбэрэл C., Тугарина М.А., Ганзориг Д., Борняков С.А.


ПЕРВЫЕ ОЦЕНКИ ОБЪЕМНОЙ АКТИВНОСТИ ПОЧВЕННОГО РАДОНА В РАЗЛОМНЫХ ЗОНАХ ЦЕНТРАЛЬНОЙ МОНГОЛИИ//
Доклады Академии наук. 2012. Т. 447. № 2. С. 199

29. Богушевич С.Е., Лысенко Г.Н.


СПЕКТРОСКОПИЧЕСКОЕ ИССЛЕДОВАНИЕ ТЕРМОЛИЗА СУЛЬФИТА КАЛЬЦИЯ//
Журнал неорганической химии. 2009. Т. 54. № 4. С. 674-679.

Методами ТГА, ЭПР и ИК-спектроскопии исследовано термическое превращение сульфита кальция в сульфат в воздушной атмосфере. Показано участие кристаллизационной воды CaSO3 · 0.5Н2 в образовании термоиндуцированных ион-радикалов SOhttp://elibrary.ru/itemimages/536158/11770396/fo_3_1.gif . Предложен механизм реакции термолиза.

30. Степаненко В.Ф., Скворцов В.Г., Иванников А.И., Дубов Д.В., Цыб А.Ф.
МЕТОДЫ ИНДИВИДУАЛЬНОЙ РЕТРОСПЕКТИВНОЙ ФИЗИЧЕСКОЙ ДОЗИМЕТРИИ В ПРОБЛЕМЕ ОЦЕНКИ ПОСЛЕДСТВИЙ НЕКОНТРОЛИРУЕМЫХ РАДИАЦИОННЫХ ВОЗДЕЙСТВИЙ//
Радиационная биология. Радиоэкология. 2011. Т. 51. № 1. С. 168-177.

Представлен обзор результатов разработки, верификации и применения методов индивидуальной физической ретроспективной дозиметрии населения загрязненных радионуклидами населенных пунктов, подвергшихся радиационному воздействию в результате аварии на ЧАЭС, а также на территориях в ареале Семипалатинского ядерного полигона. Даны оценки чувствительности методов физической ретроспективной дозиметрии. Приведены данные об индивидуальных дозах облучения населения, подвергшегося неконтролируемому радиационному воздействию.

31. Богданович Б.Ю., Крутиков М.Г., Нестерович А.В., Никулин Б.А., Шиканов А.Е.
ИСПОЛЬЗОВАНИЕ НЕЙТРОННЫХ ПОЛЕЙ ЛИНЕЙНЫХ УСКОРИТЕЛЕЙ НУКЛИДОВ ВОДОРОДА ДЛЯ ИССЛЕДОВАНИЯ ОБРАЗЦОВ ГОРНЫХ ПОРОД//
Ядерная физика и инжиниринг. 2010. Т. 1. № 6. С. 526-533.

В статье проведен анализ возможности использования линейных ускорителей нуклидов водорода в качестве нейтронных генераторов для элементного анализа горных пород. Основное внимание уделено вопросам элементного анализа на золото, уран и породообразующие элементы, составляющие коллекторы продуктивных углеводородов. Обсуждаются возможные варианты реализации рассматриваемых методик.

32. Zhou, Jiaxi; Huang, Zhilong; Zhou, Meifu; et al.

Constraints of C-O-S-Pb isotope compositions and Rb-Sr isotopic age on the origin of the Tianqiao carbonate-hosted Pb-Zn deposit, SW China //ORE GEOLOGY REVIEWS  Volume: 53   Pages: 77-92    SEP 2013
The Tianqiao Pb-Zn deposit in the western Yangtze Block, southwest China, is part of the Sichuan-Yunnan-Guizhou (SYG) Pb-Zn metallogenic province. Ore bodies are hosted in Devonian and Carboniferous carbonate rocks, structurally controlled by a thrust fault and anticline, and carried about 0.38 million tons Pb and Zn metals grading >15% Pb + Zn. Both massive and disseminated Pb-Zn ores occur either as veinlets or disseminations in dolomitic rocks. They are composed of ore minerals, pyrite, sphalerite and galena, and gangue minerals, calcite and dolomite. delta S-34 values of sulfide minerals range from +8.4 to +14.4 parts per thousand and display a decreasing trend from pyrite, sphalerite to galena (delta S-34(pyrite)>delta S-34(sphalerite)>delta S-34(galena)). We interpret that reduced sulfur derived from sedimentary sulfate (gypsum and barite) of the host Devonian to Carboniferous carbonate rocks by thermal-chemical sulfate reduction (TSR). delta C-13(PDB) and delta O-18(SMOW) values of hydrothermal calcite range from -5.3 to -3.4 parts per thousand. and +14.9 to +19.6 parts per thousand, respectively, and fall in the field between mantle and marine carbonate rocks. They display a negative correlation, suggesting that CO2 in the hydrothermal fluid was a mixture origin of mantle, marine carbonate rocks and sedimentary organic matter. Sulfide minerals have homogeneous and low radiogenic Pb isotope compositions (Pb-206/Pb-204 = 18.378 to 18.601, Pb-207/Pb-204 = 15.519 to 15.811 and Pb-208/Pb-204 = 38.666 to 39.571) that are plotted in the upper crust Pb evolution curve and overlap with that of Devonian to Carboniferous carbonate rocks and Proterozoic basement rocks in the SYG province. Pb isotope compositions suggest derivation of Pb metal from mixed sources. Sulfide minerals have Sr-87/Sr-86 ratios ranging from 0.7125 to 0.7167, higher than Sinian to Permian sedimentary rocks and Permian Emeishan flood basalts, but lower than basement rocks. Again, Sr isotope compositions are supportive of a mixture origin of Sr. They have an Rb-Sr isotopic age of 191.9 +/- 6.9Ma, possibly reflecting the timing of Pb-Zn mineralization. C-O-S-Pb-Sr isotope compositions of the Tianqiao Pb-Zn deposit indicate a mixed origin of ore-forming fluids, which have Pb-Sr isotope homogenized before the mineralization. The Permian flood basalts acted as an impermeable layer for the Pb-Zn mineralization hosted in the Devonian-Carboniferous carbonate rocks. (C) 2013 Elsevier B.V. All rights reserved.

33. Jemmali, Nejib; Souissi, Fouad; Carranza, Emmanuel John M.; et al.



Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (Domes zone, northern Tunisia): Implications for sources of metals and timing of mineralization //

ORE GEOLOGY REVIEWS  Volume: 54   Pages: 17-28    OCT 2013


The Pb-Zn ore deposits in the Guern Halfaya and Bou Grine areas (northern Tunisia) are hosted mainly by dolostones in the contact zone between Triassic and Upper Cretaceous strata and by Upper Cretaceous limestones. The deposits occur as lenticular, stratiform, vein, disseminations and stockwork ore bodies consisting of sphalerite, galena, pyrite, chalcopyrite and sulfosalt (gray copper). Barite and celestite dominate the gangue, with lesser calcite. The delta S-34 values of barite and celestite (12.7-15.0 parts per thousand) at the Oum Edeboua mine are consistent with the reduction of sulfates in Triassic evaporites within the study area (12.8 < delta S-34 < 14.0 parts per thousand). The delta S-34 values in base-metal sulfides from both study areas (2.6-9.5 parts per thousand) and the presence of bacterial relics suggest involvement of bacterially-mediated sulfate reduction in the mineralization. The present Pb isotope data are homogeneous with Pb-206/Pb-204, Pb-207/Pb-204 and Pd-208/Pb-204 ratios of 18.723-18.783, 15.667-15.685 and 38.806-38.889, respectively, which suggest a single source reservoir of Pb at depth in the upper crust. The syn-diagenetic mineralization in the Bahloul Formation and the calculated age from the Pb isotopic data suggest an Upper Cretaceous age for the Pb-Zn deposits in the Guern Halfaya and Bou Grine areas. During this period, NE-SW to ENE-WSW trending regional extensional tectonic structures likely favored migration of mineralizing fluids and eventual deposition at Guern Halfaya and Bou Grine.

34. Zhang, Jing; Chen, Yan-Jing; Pirajno, Franco; et al. Geology, C-H-O-S-Pb isotope systematics and geochronology of the Yindongpo gold deposit, Tongbai Mountains, central China: Implication for ore genesis //

ORE GEOLOGY REVIEWS  Volume: 53   Pages: 343-356   DOISEP 2013
The Yindongpo gold deposit is located in the Weishancheng Au-Ag-dominated polymetallic ore belt in Tongbai Mountains, central China. The ore bodies are stratabound within carbonaceous quartz-sericite schists of the Neoproterozoic Waitoushan Group. The ore-forming process can be divided into three stages, represented by early barren quartz veins, middle polymetallic sulfide veinlets and late quartz-carbonate stockworks, with most ore minerals, such as pyrite, galena, native gold and electrum being formed in the middle stage. The average delta O-18(water) values changed from 9.7 parts per thousand in the early stage, through 4.9 parts per thousand in the middle stage, to -5.9 parts per thousand in the late stage, with the delta D values ranging between -65 parts per thousand and -84 parts per thousand. The delta C-13(CO2) values of ore fluids are between -3.7 parts per thousand and +6.7 parts per thousand, with an average of 1.1 parts per thousand. The H-O-C isotope systematics indicate that the ore fluids forming the Yindongpo gold deposit were probably initially sourced from a process of metamorphic devolatilization, and with time gradually mixed with meteoric water. The delta S-34 values range from -0.3% to +5.2 parts per thousand, with peaks ranging from +1 parts per thousand to +4 parts per thousand. Fourteen sulfide samples yield Pb-206/Pb-204 values of 16.990-17.216, Pb-207/Pb-204 of 15.419-15.612 and Pb-208/Pb-204 of 38.251-38.861. Both S and Pb isotope ratios are similar to those of the main lithologies of the Waitoushan Group, but differ from other lithologic units and granitic batholiths in the Tongbai area, which suggest that the ore metals and fluids originated from the Waitoushan Group. The available K-Ar and Ar-40/Ar-39 ages indicate that the ore-forming process mainly took place in the period of 176-140 Ma, during the transition from collisional compression to extension and after the closure of the oceanic seaway in the Qinling Orogen. The Yindongpo gold deposit is interpreted as a stratabound orogenic-style gold system formed during the transition phase from collisional compression to extension.

The ore metals in the Waitoushan Group were extracted, transported and then accumulated in the carbonaceous sericite schist layer. The carbonaceous sericite schist layer, especially at the junction of collapsed anticline axis and fault structures, became the most favorable locus for the ore bodies.

35. Dong, Guochen; Santosh, M.; Li, Shengrong; et al.

Mesozoic magmatism and metallogenesis associated with the destruction of the North China Craton: Evidence from U-Pb geochronology and stable isotope geochemistry of the Mujicun porphyry Cu-Mo deposit //ORE GEOLOGY REVIEWS  Volume: 53   Pages: 434-445   DOI: 10.1016/j.oregeorev.2013.02.006   Published: SEP 2013
The North China Craton (NCC) provides a classic example of lithospheric destruction and refertilization. The timing and duration of magmatism and related metallogenesis associated with the destruction process are pivotal to understanding the geodynamic controls. In this study, we present zircon U-Pb and Hf data, Re-Os ages, and He, Ar, Pb and S isotope data from the Mujicun porphyry Cu-Mo deposit in the northern Taihang Mountains within the Central Orogenic Belt of the NCC. We constrain the timing of magmatism as 144.1 +/- 1.2 Ma from zircon U-Pb data on the diorite porphyry that hosts Cu-Mo mineralization. Another U-Pb age of 139.7 +/- 1.4 Ma was obtained from an epidote skarn that is located in the contact zone between the porphyry and its wall rocks. These data and five Re-Os molybdenite ages that range from 142.7 +/- 2.0 Ma to 138.5 +/- 1.9 Ma suggest that magmatism and mineralization occurred in about five million year duration from similar to 143 Ma to similar to 138 Ma. The He, Ar, Pb and, Hf data suggest that magmatism involved recycled Neoarchean lower crustal components, with input of heat and volatiles from an upwelling mantle. The Mujicun porphyry and associated mineralization provide a typical example for magmatism and metallogeny associated with lithospheric thinning in the NCC.

36. Kaljo, Dimitri; Martma, Tonu; Grytsenko, Volodymyr; et al.



Pridoli carbon isotope trend and upper Silurian to lowermost Devonian chemostratigraphy based on sections in Podolia (Ukraine) and the East Baltic area //ESTONIAN JOURNAL OF EARTH SCIENCES  Volume: 61   Issue: 3   Pages: 162-180    SEP 2012
Insufficient knowledge of carbon isotope cycling in the latest Silurian initiated the study of two regions at the western and southwestern margins of Baltica in order to obtain a more complete picture about the carbon isotope trend through the Pridoli. Shallow and open shelf carbonate rocks of the Dniester River outcrops and Kotuzhiny core in Podolia and deep shelf rocks of the East Baltic area, especially the Lithuanian cores, were studied for bulk-rock isotope analysis. The data sets of both regions begin with the mid-Ludfordian excursion and include also some part of the lowermost Devonian. The data show a new minor twin positive delta C-13 excursion (peak values 0.8-1.7 parts per thousand) in the upper Ludfordian. The Pridoli carbon isotope trend begins with a low of negative delta C-13 values, succeeded by the lower to middle Pridoli 'stability' interval (variable values below or close to 0 parts per thousand with a slight rising trend). The upper Pridoli begins with a medium to major excursion (peak values 2.3-4.5 parts per thousand), which reflects the pattern of the carbon isotope trend on the west of the Baltica palaeocontinent. Its wider significance awaits confirmation from observations elsewhere. The carbon isotope excursion at the Silurian Devonian boundary, named here the SIDE excursion (its delta C-13 values range from 1.6 parts per thousand in deep shelf settings to 3.8 parts per thousand in shallower ones and 4.5 parts per thousand in brachiopod shells), has been traced on several continents, and now also in Baltica. This excursion can serve as a well-dated global chemostratigraphic correlation tool. The shape of the excursion indicates the completeness of the studied section. We conclude that carbon isotope chemostratigraphy may contribute to subdividing the Pridoli Series into stages and that Baltica sensu lato seems to be the right place for such a development.

37. Kaljo, Dimitri; Maennik, Peep; Martma, Tonu; et al.



More about the Ordovician-Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts //ESTONIAN JOURNAL OF EARTH SCIENCES  Volume: 61   Issue: 4   Special Issue: SI   Pages: 277-294  DEC 2012
Profound environmental and biodiversity changes take place in the Ordovician-Silurian boundary interval. The Mirny Creek and Neznakomka River bank sections discussed in this paper expose the upper Katian-lower Rhuddanian part of the boundary beds. The succession consists of carbonate rocks, partly with bioherms, alternating with argillaceous and siltstone packages that are well dated by graptolites. Microfossils are rare, especially in the Hirnantian, but conodonts provide some useful markers just below and above the Hirnantian stage boundaries. The Hirnantian delta C-13 trend in the Mirny Creek section is the stratigraphically longest described so far and it has a highly specific shape. The trend commenced at the first appearance datum of Normalograptus extraordinarius or slightly below this level. The main peak occurs near the middle of the N. persculptus Biozone. Samples from the Neznakomka River suggest a somewhat wider peak interval than at Mirny Creek. Detailed comparison of the Mirny and Stirnas (Latvia) delta C-13 curves shows a general similarity despite great specific features of both trends. Correlation of the delta C-13 trends from China, Baltica and North America with that at Mirny Creek reveals a great variety of shapes of the carbon isotope curve. However, its rising limb commenced, if represented, everywhere close to the beginning of the N. extraordinarius Biozone or in terms of the Baltic succession, at the bottom of the Porkuni Regional Stage. Most likely a general shape of the HICE trend is pyramidal, which is peaking in the early N. persculptus Biochrone. Differences in the values and shape of an actual curve at different localities depend on local environmental conditions, sometimes modifying the global signal rather strongly.

38. Bejaoui, J.; Bouhlel, S.; Barca, D.; et al.The Vein-type Zn-(Pb, Cu, As, Hg) mineralization at Fedj Hassene orefield, North-Western Tunisia: Mineralogy, Trace Elements, Sulfur Isotopes and Fluid Inclusions //ESTUDIOS GEOLOGICOS-MADRID  Volume: 67   Issue: 1   Pages: 5-20    2011


The Fedj Hassene district is localized at the edge of the Tuniso-Algerian border 10 km of Ghardimaou area. It consists of a Zn-Pb vein type with minor amounts of Cu-As-Hg. The total Zn reserves are about 370.000t. The mineralization occurs within subparallel fractures to the Ain El Kohla ESE-WNW fault. Host rocks consist of limestones and marly limestones of the Middle Turonian. In the principal lode of Fedj Hassene, the mineralization occurs as vein filling of massive and brecciated brown sphalerite and minor galena ore with gangue. Other trace minerals are pyrite, chalcopyrite, orpiment, realgar, smithsonite and cerussite. LA-ICP-MS analyses in sphalerites show mean contents of 0,84 wt% Fe, 0,14 wt% Cd and 0,02 wt% Mn Ore.

Fluid inclusions study in calcite and sphalerite reveals one mineralizing fluid characterized by an average salinity 23% wt NaCl with decreasing homogenisation temperature. In fact the temperature shows decrease from sphalerite to calcite. The fluid density that corresponds to trapping pressure ranges between 1.00 g/cm(3) and 1.11 g/cm(3) and pressure close to 200 bars. Microthermometric data in fluid inclusion hosted by gangue mineral presented by calcite show an average temperature of formation around 194 degrees C. These inclusions homogenized to the liquid phase between 156 degrees C and 210 degrees C and salinities values ranging from 22 to 28 wt% NaCl and an average around 23% wt NaCl.

The delta(34)S (VCDT) values of sphalerite are in the range of + 4,6 parts per thousand to 6,4 parts per thousand (average=5,6 parts per thousand). Thermo-chemical reduction of Triassic sulfate by reaction with hydro-carbons is the most probable source for the heavy and the narrow range of the delta(34)S values.

Mineralogical, geochemical of trace elements, fluid inclusions and sulfur isotopes studies allow to include the vein-type ore field of Fedj Hassene in the polymetallic (Pb-Zn-As-Hg) vein mineralization of the nappe zone in northern Tunisia and north eastern Algeria.

39. Prado, J. L.; Alberdi, M. T.; Sanchez, B.; et al.

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