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Sandstone composition and tectonics in East Asia mobile belt

东亚移动带砂岩成分及构造

基本信息

批准号：
07304040
负责人：
HOYANAGI Koichi
金额：
$ 10.37万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07304040/
关键词：
sandstone tectonics East Asia mobile belt Basicity Index provenance CHIME age geochemistry プロビナンス CHIMF年代砂岩組成 Basicity lndex Bacisity Index

项目摘要

The purpose of this project is to know the compositional characteristics of sandstones in the East Asia mobile belt and to clarify their general relationship to the tectonic setting, basin situation, climate and sedimentary environments in mobile belt. Al2O3/SiO2-Basicity Index diagram proposed by Kiminami et al. (1992) and its similar diagrams such as K/Al-(Fe+Mg)/Al diagram have been developed as a tool to know ancient tectonic setting of sedimentary basins. Systematic data of sandstone composition were accumulated for the Permian to Cretaceous in the Japanese Islands. 380 chemical analysis were performed under the control of this project . Heavy mineral assemblage, and chemical composition of detrital minerals such as garnet, spinel, amphibole and plagioclase have been used to detect precise information of source rocks from the key formations of various ages and tectonic setting. Isotope characterization of detrital quartz was tried for the Quaternary sediments of the Kinki district. Abundact and high quality data of sandstones were gathered and accumulated also from Sikhote-Alin, Korea, Philippine, eastern Australia and New Zealand. These data enable to clarify the Circum-Pacific tectonic movement from Paleozoic to Recent. Hydraulic fractionation was checked for turbidites of the Cretaceous Ezo Group and Paleogene Otoanshigawa Group, and concluded that compositional difference controlled by grain size is not serious within sand-size fraction but critical between sand and mud. Hydraulic fractionation is clearly shown on the Al2O3/SiO2-Basicity Index diagram. The compositional variations are also controlled by sedimentary conditions such as sedimentary environments, high stand or low stand of sea-level, and marine transgression or regression. These examples were clarified by this project. These basic researches improve the precise reconstruction of ancient tectonic setting based on sandstone composition.

本项目的目的是了解东亚活动带砂岩的成分特征，阐明其与活动带构造背景、盆地情况、气候和沉积环境的一般关系。 Kiminami 等人提出的 Al2O3/SiO2 碱度指数图。 (1992)及其类似图例如K/Al-(Fe+Mg)/Al图已被开发为了解沉积盆地古代构造环境的工具。积累了日本列岛二叠纪至白垩纪砂岩成分的系统数据。在该项目的控制下进行了380项化学分析。利用石榴石、尖晶石、角闪石、斜长石等碎屑矿物的重矿物组合和化学成分，探测不同时代、不同构造背景的关键地层烃源岩的精确信息。对近畿地区第四纪沉积物进行了碎屑石英同位素表征。还从Sikhote-Alin、韩国、菲律宾、澳大利亚东部和新西兰收集和积累了丰富且高质量的砂岩数据。这些数据能够阐明从古生代到近代的环太平洋构造运动。对白垩纪虾夷群和古近纪乙安石川群浊积岩进行了水力分馏检查，得出结论，受粒度控制的砂粒级中的成分差异并不严重，但砂和泥之间的成分差异却很重要。 Al2O3/SiO2 碱度指数图上清楚地显示了水力分馏。成分变化还受到沉积环境、海平面高位或低位以及海侵或海退等沉积条件的控制。该项目阐明了这些示例。这些基础研究提高了基于砂岩成分的古代构造背景的精确重建。