کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8915256 1641040 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Authigenic carbonate sedimentation in Eravnoe group lakes (Western Transbaikalia): Response to Holocene climate change
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Authigenic carbonate sedimentation in Eravnoe group lakes (Western Transbaikalia): Response to Holocene climate change
چکیده انگلیسی
Sediments of intracontinental closed lakes are unique natural archives that store climate history records. We study Late Holocene carbonate-bearing sediments of Lake Dolgoe, a small saline lake in the Eravnoe basin on the Vitim Plateau (western Transbaikalia). Sediment samples have been analyzed by several methods: X-ray powder diffraction, infrared spectroscopy, stable isotope (18O and 13C) determination, laser diffraction particle size analysis, XRF elemental analysis, etc. The mineral phases of bottom sediments include clastic and carbonate components and hydromagnesite at the section top; carbonates are authigenic varieties of the calcite-dolomite series. Modeling of complex XRD profiles reveal Mg-calcite with various Mg contents and excess-Ca dolomites, which are mixed-structure crystals compositionally close to stoichiometric dolomite. The crystal structure and relative percentages of carbonates from the dated sedimentary section controlled by climate and lake level changes allow reconstructing the Holocene history of Lake Dolgoe.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Russian Geology and Geophysics - Volume 58, Issue 11, November 2017, Pages 1390-1400
نویسندگان
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