کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8865863 1620865 2018 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Genesis of Permian sedimentary manganese deposits in Zunyi, Guizhou Province, SW China: Constraints from geology and elemental geochemistry
ترجمه فارسی عنوان
پیدایش رسوبات منگنز رسوبی پرمین در زونیه، استان گویچو، سوئیس چین: محدودیت های زمین شناسی و ژئوشیمیایی عناصر
کلمات کلیدی
سپرده منگنز پرمین، محیط زیست، رسوب هیدروترمال، پلت فرم یاتا جنوب غربی، چین،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی
The Permian was a key period of manganese deposition in Southern China, as evidenced by a series of large-to medium-scale manganese deposits along the margin of the Yangtze Block. This study characterizes representative examples that occur in late Middle Permian silicon-mud-limestones in Zunyi and adjacent areas and examines their implications for manganese deposit genesis and sedimentary environment. The manganese deposits are typical carbonates deposits, with the main manganese-bearing mineral being rhodochrosite, followed by calcimangite, capillitite, manganocalcite, and kutnohorite in decreasing abundance. The ore bodies, hosted in the black shale series of the Late Permian Maokou Formation, are mainly stratiform or stratoid in shape, usually have lamellar, massive, banded, fragmental, or pisolitic structures, and contain paragenetic gangue minerals including rutile, barite, pyrite, and chalcopyrite, etc. These features are characteristic of hydrothermal exhalative sedimentary deposits, implying that this was their mode of genesis. The Mn-ores have higher Co, V, Ni, Cu, Sr and total REE content, lower Y/Ho ratios, and characterized by the Fe-Mn-(Cu + Co + Ni) × 10, lgTh vs. lgU, P2O5vs. Y and Fe/Ti vs. Al/(Al + Fe + Mn) diagrams strongly suggest hydrothermal activity during manganese mineralization. The Th/U, V/Cr and V/(V + Ni) ratios of samples from the Zunyi manganese deposits are 0.38-3.27, 3.11-24.00 and 0.38-0.99, respectively, indicating the sedimentary environment was weakly oxidizing to reducing condition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Geochemical Exploration - Volume 192, September 2018, Pages 142-154
نویسندگان
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