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RECONSTRUCTION OF A GEOTECTONIC FRAMEWORK OF EASTERN ASIA BEFORE THE OPENING OF THE JAPAN SEA

日本海开放前东亚大地构造框架的重建

基本信息

批准号：
13573008
负责人：
EHIRO Masayuki
金额：
$ 4.93万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13573008/
关键词：
Far East Russia Spassk Belt Samarka Belt Khabarovsk Belt Badzhal Belt Inner Zone of Southwest Japan Jurassic accretionary complex Opening of Japan Sea シホテアリン山地ハバロフスク帯ロシアタウハ帯ズラブレフカ帯スパスク帯

项目摘要

Geological investigation in the Spassk, Samarka, Khabarovsk and Badzhal Belts of Sikhote-Alin, Far East Russia was carried out to correlate the tectonic belts of Far East Russia with those of Japan and to reconstruct a geotectonic framework of eastern Asia before the opening of the Japan Sea.The field observation of the deformed Cambrian rocks in the Spassk Belt revealed that so-called melange is not a melange but a deformed conglomerate.The Samarka Belt, which has been correlated with the Tamba-Mino Belt of Inner Zone of Southwest Japan, comprises mainly the Jurassic accretionary complexes, but also includes ophiolites and Permian clastic rocks, each of which is correlatable respectively with the Paleozoic Maizuru Belt and Ultra-Tamba Belt of Southwest Japan. We newly found out a radiolarian fauna belonging to the Pseudoalbaillella globosa fauna of the Late Permian from the mudstone of the Sebchar Formation, probably correlated with the clastic rocks of the Ultra-Tamba Belt.From the Khabarovsk Belt, Middle Permian fusulinoidean-bearing limestone blocks and Permian radiolarian-bearing chert were corrected. The Badzhal Belt in the Amursk district includes off-shore limestone with Triassic conodont, Buchia-bearing sandy mudstone and terrigenous mudstone with Triassic conodont-bearing calcareous nodular lenses. The last calcareous lenses of Triassic age are very interesting, because it indicates a existence of older continent in the Badzal Belt, which has been thought to be composed of Jurassic accretionary complexes.The Badzhal Belt in the upper Cool Basin comprises mudstone with siliceous tuff and sandstone, mixed rocks with chert blocks, and red and gray colored chert slabs yielding Triassic conodont. They are probably constituents of Jurassic accretionary complexes, but detailed construction for these rocks is still pending, because the corrected samples from the Badzal Belt are under examination.

在斯帕斯克、萨马尔卡、哈巴罗夫斯克和锡霍特-阿林的巴扎尔带进行地质调查，俄罗斯远东地区是为了将俄罗斯远东地区的构造带与日本的构造带进行对比，重建日本海开孔前的东亚大地构造格局而进行的。与日本西南部内带丹波-美浓带对比的萨马尔卡带主要由侏罗纪增生杂岩组成，但也包括蛇绿岩和二叠纪碎屑岩，它们分别与日本西南部的古生代舞鹤带和超丹波带相对应。在Sebchar组泥岩中新发现了一个属于晚二叠世Pseudoalbaillella globosa动物群的放射虫动物群，可能与Ultra-Tamba带的碎屑岩有关，并对哈巴罗夫斯克带中二叠世含fusulinoidea的灰岩块和二叠纪含放射虫的硅质岩进行了校正。Amursk地区的Badzhal带包括含三叠纪牙形石的离岸石灰岩、含Buchia的桑迪泥岩和含三叠纪牙形石的钙质结核状透镜体的陆源泥岩。三叠纪晚期的钙质透镜体是一个非常有趣的发现，它表明巴扎尔带存在一个古老的大陆，巴扎尔带被认为是由侏罗纪增生杂岩组成的。巴扎尔带位于库尔盆地上部，由泥岩、硅质凝灰岩和砂岩、混合岩和硅质岩块以及红色和灰色的硅质岩片组成，它们产出三叠纪牙形石。它们很可能是侏罗纪增生杂岩的组成部分，但这些岩石的详细结构仍有待确定，因为来自巴扎尔带的校正样品正在检查中。