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地质学家曾作了许多努力以提高关于砂的成分与反映其自身所处的大地构造位置之间具有密切对应关系的准确性。本文通过对马里亚纳和日本弧前与弧后地区的砂/砂岩的岩石学研究、对比,以确定砂的组分与位于陆壳和洋壳部分上的弧前、弧间、弧后盆地等大地构造位置之间的对应关系。文中的重点是确认弧前,弧后盆地之间的组分有差异。除了这个大问题之外,还通过日本弧前地区研究了砂的组分随时间的变化。
Geologists have made many efforts to improve the accuracy of the correspondence between the composition of the sand and the tectonic positions that reflect its own location. In this paper, the petrological studies and correlations of sand / sandstone between the pre- and post- arc regions of Mariana and Japan have been conducted to determine the composition of the sand and the pre-arcuate, inter-arc, backarc basins, etc. located in continental and oceanic crust portions The correspondence between the earth’s tectonic positions. The focus of the paper is to confirm that there are differences in composition between the arc and backarc basins. In addition to this major issue, the composition of the sand has been studied over time through the Precambar region of Japan.