南部北上帯-早池峰構造帯と黒瀬川帯 : "古領家帯"(古領家帯と黒瀬川帯の構成要素と改変過程)  [in Japanese] Rclationships in tectonic framework among the South Kitakami and Hayachine Tectonic Belts, Kurosegawa Belt, and "Paleo-Ryoke Belt"(Geotectonic evolution of the Paleo-Ryoke and Kurosegawa Terranes)  [in Japanese]

南部北上帯-早池峰構造帯と黒瀬川帯は, ともに先シルル紀基盤と浅海成古・中生界の分布で特徴づけられる地体で, 黒瀬川帯がペルム紀〜三畳紀付加体をともなうという違いを除けば, 岩石構成や層序はよく似ている.両者は, 古生代以降白亜紀まで同一の古生物地理区に属していたので, ほぼ同一のテクトニックセッティングの, 近接した位置にあったと考えられる."古領家帯"と南部北上帯-早池峰構造帯・黒瀬川帯とは, 前者の"ペルム紀"花崗岩類の放射年代や^<87>Sr/^<86>Sr初生値が後2者のペルム紀礫岩中の花崗岩礫のそれらに類似すること以外に類似点はみられない.とくに, 後2者を特徴づける先シルル紀基盤岩類や浅海成古生界が前者には全く認められないので, "古領家帯"を南部北上帯の延長と考えるのは困難である.飛騨外縁帯も, 南部北上帯の古生界層序との間に一部類似があるが, 少なくとも中生代には両者は異なったテクトニックセッティングの遠く離れた位置にあったと考えられる.

The South Kitakami and Hayachine Tectonic Belts of Northeast Japan and the Kurosegawa Belt of Southwest Japan are remnants of the South Kitakami Paleoland and Kurosegawa Landmass, both consisting of the Caledonian basements and shallow marine strata ranging from Silurian to Cretaceous. Excepting the existence of Permian-Triassic accretionary complexes in the Kurosegawa Landmass, these paleolands are closely related in the geotectonic history and paleobiogeography during the Paleozoic to Mesozoic, and are considered to be originated and developed in a closely located region with same tectonic settings.The "Paleo-Ryoke Belt" (Paleo-Ryoke Land) is considered to had been an extension of the South Kitakami Paleoland, mainly based on the similarities of the ages and initial ^<87>Sr/^<86>Sr ratios between the "Permian" granitic rocks of the "Paleo-Ryoke Belt" and granitic clasts including in the Permian Usuginu-type conglomerate of the South Kitakami. This idea is, however, questionable to a degree, because, 1) the source granitic bodies of the granitic clasts in the Usuginu-type conglomerate have not been found in the South Kitakami Belt, and 2) the pre-Silurian basements and shallow marine Paleozoic strata, which characterize the South Kitakami and Kurosegawa, are almost missing in the "Paleo-Ryoke Belt".The Early Paleozoic stratigraphy of the Hida-Gaien Belt somewhat resembles to that of the South Kitakami Belt. But the Hida-Gaien Belt differs from the South Kitakami in lithofacies of the Middle-Upper Paleozoic and, particularly, in Mesozoic geotectonic history.