| 孙腾蛟,罗小平,密文天.贵州松林陡山沱组上部硅质岩特征及成因探讨[J].地质找矿论丛,2013,28(4):582-588 |
| 贵州松林陡山沱组上部硅质岩特征及成因探讨 |
| Characteristics and genetic discussion about the siliceous rock of upper Doushantuo formation |
| 投稿时间：2012-11-19 |
| DOI：10.6053/j.issn.1001-1412.2013.04.014 |
| 中文关键词: 硅质岩 生物化学作用 陡山沱组 松林地区 贵州省 |
| 英文关键词:Siliceous rock bio-chemistry Doushantuo formation Songlin Guizhou province |
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| 摘要点击次数: 2553 |
| 全文下载次数: 1980 |
| 中文摘要: |
| 贵州松林陡山沱组上部发育一套硅质岩，主要岩性为硅质页岩、富结核硅质岩、含磷质硅质岩及硅质结核。岩石的地球化学特征研究显示：Al—Fe—Mn判别图解均落于Ⅱ区生物成因区，MnO/TiO2值介于0.01~0.1之间，表明受陆源物质供给影响强烈。结合岩相古地理及岩性组合综合分析，岩石的沉积环境应属于盆地边缘陆棚区半深水-深水滞留还原环境；受生物化学作用影响，沉淀的富SiO2沉积物在成岩阶段发生分异作用，富集的硅质开始迁移并重新凝聚成岩；成岩后生阶段，重结晶和交代作用明显。 |
| 英文摘要: |
| In the upper Doushantuo formation is develops a set of siliceous rock in Songlin area, Gui zhou province. The siliceous rock consists mainly of siliceous shale, concretion-rich siliceous rock, phosphorus siliceous rocks and siliceous concretion. In Al-Fe-Mn discrimination diagrams value of the siliceous rock fall in biogenic region Ⅱ.The value of MnO/TiO2 ratios is in range of 0.01 to 0.1, All these imply a strong influence of terrestrial supply source. Combined with analysis of lithofacies paleogeography and lithologic associations the siliceous rock should be deposited in semi-deep to deep retention-reduction environment of continental shelf at margin of oceanic basin. Influenced by bio-chemistry SiO2-rich sediment was differentiated during diagenesis and SiO2 was gathered together and coagulatreded into rock. In the anadiagenesis stage, it experienced obviously recrystallization and metasomatism. |
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