付加複合体の区分法と付加体地質学における構造層序概念の有効性(付加体地質学の手法)(ジュラ紀付加体の起源と形成過程)  [in Japanese] How to divide accretionary complexes : efficiency of tectonostratigraphy for understanding accretionary tectonics(Methods)(Origin and evolution of Jurassic accretionary complexes in Japan)  [in Japanese]

付加複合体の内部では地層の累重関係や側方への連続性は破壊され, 異なる岩相・堆積年代を示す岩石が混在している.従って, 付加複合体を岩相層序単元に区分することはできず, 構造層序単元を設定し区分するべきである.本論では, 構造層序単元の設定法と命名法を議論し, その手順を提案した.構造層序単元は, 構成岩類の岩相・堆積年代の違いと, 産状・変形構造・変成度の違いを基準に区分される.そして基本となる単元をコンプレックスとし, その上位階層にテレーンを設定する.この様な構造層序区分は, 付加複合体の形成過程を特徴づける構造運動を解釈するために行なわれ, 岩相・堆積年代の違いは付加直前までの海洋プレート層序の性質の違いを表わし, 産状・変形構造・変成度の違いは付加過程および付加後の事変を示すとみなされる.

Within accretionary complexes, the stratal superposition and lateral continuity of their component rocks have been disrupted and fragmented during subduction-accretion processes. As a result, rocks of different type and age are mixed. Accretionary complexes, therefore, cannot be divided into ordinary lithostratigraphic units based upon the stratigraphic lithological changes, because of the disrupted and mixed nature of the rocks.Tectonostratigraphy is a descriptive classification and correlation of mixed rock-bodies, and accretionary complexes should be designated as tectonostratigraphic units. In this paper, the method for establishing tectonostratigraphic units and their nomenclature are discussed. The procedures are as follows : (1) Tectonostratigraphic units should be defined by difference in lithology and age of reconstructed oceanic plate stratigraphy, and also by distinctive occurrence, deformation style and metamorphic grade of the component rocks.(2) The hierarchy of tectonostratigraphic units is proposed as follows : the complex is the primary formal unit and it is the basal rank in the hierarchy, and a terrane is next in rank above a complex.Compared to the lithostratigraphic principles, tectonostratigraphy provides us the following aspects : lithological and chronological differences in each unit result from the property of the oceanic plate stratigraphy prior to the accretion, whereas the distinction of occurrence, deformation style and metamorphic grade relates to the accretion and the post-accretion tectonics. Tectonostratigraphy is not a new concept but most useful for describing and understanding the mixed rock-bodies of accretionary complexes.