PRIMORSKY CENTRE FOR LOCAL ELEMENTAL AND ISOTOPIC ANALYSES OF FEGI FEB RAS: EXPERIENCE OF THE FUNCTIONING AND MAIN AREAS OF RESEARCH

The Shared Research Facilities "Primorsky Centre for Local Elemental and Isotopic Analyses" was created based on the instrumental base of the Far Eastern Geological Institute of the Far Eastern Branch of the Russian Academy of Sciences. The Shared Research Facilities conducts its own (for the needs of FEGI FEB RAS) fundamental and applied scientific research to establish the elemental, isotopic composition and structure of both natural and artificial objects, as well as jointly with other scientific Russian and foreign institutions and universities, industrial enterprises, state and private companies that require modern, precision methods for analyzing various substances and materials, diagnosing and monitoring the condition and changes in the environment

ЦКП "ПРИМОРСКИЙ ЦЕНТР ЛОКАЛЬНОГО ЭЛЕМЕНТНОГО И ИЗОТОПНОГО АНАЛИЗА" ДВГИ ДВО РАН: ОПЫТ ФУНКЦИОНИРОВАНИЯ И ОСНОВНЫЕ НАПРАВЛЕНИЯ ИССЛЕДОВАНИЙ

The Shared Research Facilities "Primorsky Centre for Local Elemental and Isotopic Analyses" was created based on the instrumental base of the Far Eastern Geological Institute of the Far Eastern Branch of the Russian Academy of Sciences. The Shared Research Facilities conducts its own (for the needs of FEGI FEB RAS) fundamental and applied scientific research to establish the elemental, isotopic composition and structure of both natural and artificial objects, as well as jointly with other scientific Russian and foreign institutions and universities, industrial enterprises, state and private companies that require modern, precision methods for analyzing various substances and materials, diagnosing and monitoring the condition and changes in the environment.Центр коллективного пользования (ЦКП) «Приморский центр локального элементного и изотопного анализа» создан на основе приборной базы Дальневосточного геологического института ДВО РАН. ЦКП проводит собственные (для нужд ДВГИ ДВО РАН) фундаментальные и научно-прикладные исследования по установлению элементного, изотопного состава и структуры как природных, так и техногенных объектов, а также совместно с другими научными российскими и зарубежными учреждениями и вузами, промышленными предприятиями, государственными и частными компаниями, имеющими потребность в современных, прецизионных методах анализа различных веществ и материалов, диагностики и мониторинга состояния и изменения окружающей среды.

Multiple Sulfur Isotope Evidence for Bacterial Sulfate Reduction and Sulfate Disproportionation Operated in Mesoarchaean Rocks of the Karelian Craton

Sulfur isotope in sulfides from the Paleoarchean and the Neoarchean sedimentary rocks evidence microbial sulfur metabolism in Archean sulfur cycle. However, sulfur metabolism for the Mesoarchean interval is less obvious since evidence for a large range in sulfur isotope values has not yet been observed in Mesoarchean samples. We report the results of multiple sulfur isotope measurements for sulfide minerals from ~2.8 Ga sedimentary rocks in the southeastern part of the Karelian Craton. In situ isotope analysis of sulfide grains have been performed using a femtosecond laser-ablation fluorination method. Sulfide samples studied here yielded Δ33S values between −0.3 and +2.7‰ and δ34S values between −10 and +33‰. The Δ33S dataset was interpreted to indicate the incorporation of sulfur from two coexisting sulfur pools, photolytic sulfate and photolytically derived elemental sulfur. We suggest that the relative contributions of these Δ33S different pools to the pyritic sulfur could be controlled by the metabolic activity of coexisting sulfate-reducing and sulfur-disproportionating bacteria during pyrite formation. We therefore suggest the operation of different metabolic pathways of sulfur in Mesoarchean sedimentary environments

Responses of the Okhotsk Sea environment and sedimentology on global climate changes at the orbital and millennial scale during the last 350 kyr

http://www.godac.jamstec.go.jp/darwin/cruise/mirai/mr06-04_leg1/

Multiple Sulfur Isotope Evidence for Bacterial Sulfate Reduction and Sulfate Disproportionation Operated in Mesoarchaean Rocks of the Karelian Craton

Sulfur isotope in sulfides from the Paleoarchean and the Neoarchean sedimentary rocks evidence microbial sulfur metabolism in Archean sulfur cycle. However, sulfur metabolism for the Mesoarchean interval is less obvious since evidence for a large range in sulfur isotope values has not yet been observed in Mesoarchean samples. We report the results of multiple sulfur isotope measurements for sulfide minerals from ~2.8 Ga sedimentary rocks in the southeastern part of the Karelian Craton. In situ isotope analysis of sulfide grains have been performed using a femtosecond laser-ablation fluorination method. Sulfide samples studied here yielded Δ33S values between −0.3 and +2.7‰ and δ34S values between −10 and +33‰. The Δ33S dataset was interpreted to indicate the incorporation of sulfur from two coexisting sulfur pools, photolytic sulfate and photolytically derived elemental sulfur. We suggest that the relative contributions of these Δ33S different pools to the pyritic sulfur could be controlled by the metabolic activity of coexisting sulfate-reducing and sulfur-disproportionating bacteria during pyrite formation. We therefore suggest the operation of different metabolic pathways of sulfur in Mesoarchean sedimentary environments