| Research on Genesis of Pyrite near the Permian-Triassic Boundary in Meishan, Zhejiang, China |
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| 作者姓名： | JIANG Yao-fa TANG Yue-gang CHOU Chen-lin |
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| 作者单位： | [1]Department of Resourses and Geoscience, China University of Mining ＆ Technology, Beijing 100083, China [2]Xuzhou Institute of A rchitectural Technology, Xuzhou, Jiangsu 221008, China [3]Illinois State Geological Survey, Champaign, IL, 61820, U.S.A |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金;教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | The content and crystal forms of pyrite and sulfur isotope composition of pyrite sulfur as well as its vertical distribution near the Permian-Triassic （P/T） boundary in the Meishan section, Changxing county, Zhejiang province, China were studied using geological, petrological, mineralogical and geochemical methods （techniques）. The result showed that the genesis of abundant pyrites in bed 24e2 at the uppermost part of the Changxing Formation in the Me- ishan section may be related to volcanic activity. In bed 24e2 of the Meishan section, pyrite has its highest content of 1.84% and the sulfur isotope composition has the highest 834S value at ＋2.2%0 which is very similar to that of the average value of volcanic gas, There are some volcanic products such as β-quartz, siliceous cylinders and siliceous spherules which coexisted with pyrites in beds 24e2 and 24f. It can be concluded that a large quantity of volcanic ash fell into the South China Sea and was incorporated into marine sediments during the formation of limestone at the uppermost part of the Changxing Formation. The volcanic eruption with massive amounts of H2S and SO2 gas at the end of the Permian period resulted in the enrichment of HES in the South China Sea areas, The reaction of H2S with reactive iron minerals formed the mass of abundant pyrites.
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| 关 键 词： | β-quartz |
| 收稿时间： | 2006-03-05 |
| 修稿时间： | 2006-04-10 |
Research on Genesis of Pyrite near the Permian-Triassic Boundary in Meishan, Zhejiang, China |
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| JIANG Yao-fa TANG Yue-gang CHOU Chen-lin.Research on Genesis of Pyrite near the Permian-Triassic Boundary in Meishan, Zhejiang, China[J].Journal of China University of Mining and Technology,2006,16(4):457-460. |
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| Authors: | JIANG Yao-fa TANG Yue-gang CHOU Chen-lin |
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| Affiliation: | 1. State Key Laboratory of Biogeology and Environmental Geology and School of Earth Science, China University of Geosciences (Wuhan), Wuhan 430074, China;2. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China;3. Department of Geosciences, University of Montana, Missoula, MT 59812, USA;4. Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 21008, China;1. Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Tokyo, Japan;2. Graduate School of Environmental Studies, Tohoku University, Aramaki-Aza-Aoba 6-6-20, Sendai, Japan;3. Graduate School of Science, Tohoku University, Aramaki-Aza-Aoba 6-3, Sendai, Japan;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074, China;2. Department of Geological Sciences, University of Oregon, Eugene, OR 97403, USA |
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| Abstract: | The content and crystal forms of pyrite and sulfur isotope composition of pyrite sulfur as well as its vertical distribution near the Permian-Triassic (P/T) boundary in the Meishan section, Changxing county, Zhejiang province, China were studied using geological, petrological, mineralogical and geochemical methods (techniques). The result showed that the genesis of abundant pyrites in bed 24e2 at the uppermost part of the Changxing Formation in the Meishan section may be related to volcanic activity. In bed 24e2 of the Meishan section, pyrite has its highest content of 1.84% and the sulfur isotope composition has the highest δ34S value at +2.2‰ which is very similar to that of the average value of volcanic gas. There are some volcanic products such as β-quartz, siliceous cylinders and siliceous spherules which coexisted with pyrites in beds 24e2 and 24f. It can be concluded that a large quantity of volcanic ash fell into the South China Sea and was incorporated into marine sediments during the formation of limestone at the uppermost part of the Changxing Formation. The volcanic eruption with massive amounts of H2S and SO2 gas at the end of the Permian period resulted in the enrichment of H2S in the South China Sea areas. The reaction of H2S with reactive iron minerals formed the mass of abundant pyrites. |
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| Keywords: | pyrites sulfur isotope Permian-Triassic boundary volcanism |
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