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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移动的带砂岩的成分特征，阐明其与移动的带构造背景、盆地环境、气候和沉积环境的一般关系。Kiminami等（1992）提出的Al_2O_3/SiO_2-碱度指数图及其类似的K/Al-（Fe+Mg）/Al图已被发展成为了解沉积盆地古构造背景的工具。在日本列岛上积累了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。利用重矿物组合和石榴石、尖晶石、角闪石、斜长石等碎屑矿物的化学成分，可以精确地探测不同时代、不同构造背景的关键层系烃源岩的信息。对近畿地区第四纪沉积物进行了碎屑石英的同位素表征。在锡霍特-阿林、韩国、菲律宾、澳大利亚东部和新西兰也收集和积累了丰富和高质量的砂岩资料。这些资料有助于阐明古生代至近代的环太平洋构造运动。对白垩系江佐群和古近系大东岸川群浊积岩进行了水力分馏检验，认为粒度控制的组分差异在砂粒级内并不严重，但在砂和泥之间是关键。水力分馏在Al 2 O3/SiO2-碱度指数图上清楚地显示。沉积环境、海平面高低、海侵海退等沉积条件也控制着沉积物成分的变化。这个项目澄清了这些例子。这些基础性研究，提高了基于砂岩成分的古构造环境重建的精度。