Characterization and comparison of Cretaceous red beds in Kyushu and east Asia

九州与东亚白垩纪红层特征与比较

• 批准号: 06640587
• 负责人: MIKI Takashi
• 金额: $ 1.15万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06640587/
• 关键词: Cretaceous; Red beds; Sedimentary environment; Paleoclimate; Chemical Composition

Red beds at various localities of the world have attracted the interest of researchers owing to their distinctive color in the field. However, the genesis of red beds is complex and the subject of continuing research. Cretaceous red beds in middle Kyushu included in the Onogawa, Mifune and Goshonora Groups have been examined from sedimentological, mineralogical and geochemical viewpoints, and a hypothesis for their coloration is discussed.Field and laboratory studies on the red beds lead us to the following conclusions. Fine-grained hematite disseminated in clayy matrix is responsible for red coloration of sediments, which originated from iron in iron-bearing minerals in their souce rocks. Iron substances supplied to the terrestrial and brackish sedimentary basins were preserved in a ferric state under oxidizing conditions, and ultimately aged to the pigmenting hematite. Iron transported to the shallow sea bottom was reduced and removed in solution without contribution of red coloration. A supply of iron into a depositional basin, and an oxidizing condition favorable for preservation of iron in a ferric state are the important factors for red coloration of the beds. Hot and dry climates in which evaporitic minerals formed in southern China and Indochinaplayd a less important role in red beds formation in middle Kyushu.

世界各地的红层因其独特的颜色而引起了研究者的兴趣。然而，红层的成因是复杂的，并且是持续研究的主题。本文从沉积学、矿物学和地球化学的角度对九州中部白垩纪的小野川群、三船群和五所之群的红层进行了研究，并讨论了红层的着色假说。细粒赤铁矿嵌布在粘土质基质中，是造成沉积物呈红色的主要原因。供给陆地和半咸水沉积盆地的铁物质在氧化条件下以铁态保存，并最终老化成着色的赤铁矿。运输到浅海底部的铁在溶液中被还原和去除，而不贡献红色。沉积盆地中的铁供给和有利于铁以铁态保存的氧化条件是使地层呈红色的重要因素。中国南部和印度支那的干热气候对九州中部红层的形成作用较小。

项目成果

T.Miki: "Comparison of ancient and present environments by means glauconite." Proc.Intern.Symp.Geol.Environ.343-350 (1996)

T.Miki：“通过海绿石来比较古代和现在的环境。”

Miki,T.: "Comparison of ancient and present environments by means of glauconite" Proc.Intern.Symp.Geology & Environment. 343-350 (1996)

Miki,T.：“通过海绿石比较古代和现在的环境”Proc.Intern.Symp.Geology

中牟田,義博: "プロファイルフィッティング法によるX線粉末データの精密解析" ゼオライト. 11. 171-179 (1994)

Nakamuta, Yoshihiro：“使用轮廓拟合方法精确分析 X 射线粉末数据”Zeolite，11. 171-179 (1994)。

T.Miki: "A geological study of red and green pigments found on the decorated chamber walls of mounded tombs (in Japanese)." J.Archaeo.Soc.Kyushu. 70. 44-49 (1995)

T.Miki：“对在土丘装饰的墓室墙壁上发现的红色和绿色颜料进行的地质研究（日语）。”

三木孝: "装飾古墳の赤色・緑色顔料に関する地質学的一考察" 九州考古学. 70. 44-49 (1995)

Takashi Miki：“装饰古墓中红色和绿色颜料的地质研究”九州考古学70。44-49（1995）。