Tectonics of eastern margin of the Asian continent

我们在日本东北部的Kitakami大规模进行了我们的Paleomatic研究，在日本西南部的Nohi地区，以及在俄罗斯的Sikhote Alin山进行了研究。在Omoe半岛的黎巴嫩网站上进行了比较（北纬39.6°，东经142.0°）的Kitakami大规模移植。在62 - 71马海崎火山（D=283.5°，I=9.4°，α-D295-D2=8.0°）和114 - 119马哈拉克山火山形成（D=274.2°， I=-20.4°）的倾斜校正后，发现了与浅嵌入的西部退化。在62 - 71 Ma时，Kitakami Massif位于低纬度（5°±4°N）。取一个参考的Paleocene预期的Paleomagnetic极点从Sikhote Alin，Kitakami Massif被翻译成北向超过25°，自65 Ma。我们把北九州大规模在30马和22马之间的某个时候被转移到了亚洲大陆，在日本海开放之前。我们投资 ... More 在日本西南地区，中铁线（MTL）的曲线形成。我们在诺希地区进行了一项平行电磁研究，东北部MTL在日本西南部东部部分的曲线部分。Nohi area are experienced a clockwise rotation through more than 45° with respect to the Asian continent as a part of Southwest Japan but that the amount of rotation of the Nohi area is 23°smaller than that of the central part of Southwest Japan。一个新的模型被开发出来以解释纹理旋转。大约15年前，在西南日本附属于日本海的最新阶段进行了时钟旋转，东端移动了南向超过60公里的最后一个横向条纹滑动错误，其中包括了MTL和Akaishi战术线目前的北南段。我们将MTL的曲线描述为15 Ma条纹滑动故障系统的一个组成部分，以及MTL相关的小弯曲与Nohi地区的小差异旋转与日本西南部的中心部分有关。Less（低）

We carried out our paleomagnetic study in Kitakami massif in Northeast Japan, Nohi area in easternpart of Southwest Japan, and Sikhote Alin mountain in Russia.Paleogene and early Cretaceous welded tuffs have been sampled from eleven sites at the Omoe Peninsula(39.6°N,142.0°E) in the Kitakami massif of northeast Japan for paleomagnetic study. Westerly declinations with shallow inclination are identified after tilt correction in the 62〜71 Ma Heizaki volcanics(D=283.5°,I=9.4°, αィイD295ィエD2=8.0°) and in the 114〜119 Ma Harachiyama Formation(D=274.2°, I=-20.4°). The shallow inclination indicates that the Kitakami massif was located in low latitude(5°±4°N) at 62〜71 Ma. Taking into account a reference paleomagnetic pole of the Paleocene expected from Sikhote Alin, the Kitakami massif was translated northward over 25° in latitude since 65 Ma. We conclude that the Kitakami massif was incorporated into Asian continent at some time between 30 Ma and 22 Ma before opening of the Japan Sea.We investig … More ate formation of the curvature of the Median Tectonic Line (MTL) in Southwest Japan. we carried out a paleomagnetic study in the Nohi area, north of the curved part of the MTL in the eastern part of Southwest Japan. Paleomagnetic data indicate that the Nohi area are experienced a clockwise rotation through more than 45° with respect to the Asian continent as a part of Southwest Japan but that the amount of rotation of the Nohi area is 23°smaller than that of the central part of Southwest Japan. A new model is developed to explain the tectonic rotation. At about 15 Ma during the latest stage of the clockwise rotation of Southwest Japan associated with opening of the Japan Sea, the eastern end moved southward by more than 60 km along a lest-lateral strike-slip fault which comprised the present north-south segment of the MTL and the Akaishi Tectonic Line. We conclude that the curvature of the MTL is a composite of the 15 Ma strike-slip fault system and a small bend of the MTL associated with the small differential rotation of the Nohi area with respect to the central part of Southwest Japan. Less