Was there the "Mongol-Okhotsk Ocean?"-On tectonic evolution of Eurasian Continent-

2011 Fiscal Year Final Research Report

• Project/Area Number: 20403013
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Geology
• Research Institution: Nagoya University
• Principal Investigator: TSUKADA Kazuhiro 名古屋大学, 博物館, 准教授 (80303600)
• Co-Investigator(Kenkyū-buntansha): ADACHI Mamoru 名古屋大学, 博物館 (10113094) ; YOSHIDA Hidekazu 名古屋大学, 博物館 (30324403) ; OTOH Shigeru 富山大学, 大学院・理工学研究部 (60194221)
• Co-Investigator(Renkei-kenkyūsha): KURIHARA Toshiyuki 新潟大学, 大学院・自然科学研究科 (10447617) ; KASHIWAGI Kenji 富山大学, 大学院・理工学研究部 (90422625)
• Project Period (FY): 2008 – 2011
• Keywords: テクトニクス / ユーラシア大陸 / モンゴル-オホーツク海

Research Abstract

It have been considered that the rocks of the eastern part of the Khangai. Khentei belt, Mongolia were composed of Devonian or possibly Carboniferous accretionary complexes including radiolarian chert and Carboniferous shallow marine sedimentary rocks(Tomurtogoo, 2003), but we revealed that the Carboniferous formation is mostly a part of the accretionary complexes. In addition, the following three shear zones are recognized in the eastern part of the Khangai. Khentei belt.(1) The rocks of the northern part of this belt are intensely sheared with asymmetric structures showing a top-to the North sense of shear. The tectonic foliation is generally sub-horizontal and is cut by syn-tectonic plutonic rock dated between 434 and 462 Ma. Added to this, a granitic clast of 277 Ma is included in a sheared rock of the Haraa terrane. These facts suggest that the rocks of the area were sheared twice :(a) at pre-Silurian, and(b) at least after Early Permian.(2) A shear zone trending NE with asymmetric structures showing a dextral sense of shear is developed in the northern part of the belt.(3) The sheared rocks of the southern part of the belt which trend NE with steep dipping have asymmetric structures indicating a sinistral sense of shear. These sheared rocks are intruded by syn-tectonic granitic rocks dated between 314 and 278 Ma. This shear zone cuts across the shear zone(2) and is disturbed by the shear zone(1b).

Research Products

• [Journal Article] On a conglomerate in the Khugnukhan area (2010)
  • Author(s): Chuluun, D., Otoh, S., Sersmaa, G., Tsetseg, R., Tsukada, K., and Munkhtsetseg, O.
  • Journal Title: Mongolian Geoscientist Volume: no.36 Pages: 28-31
• [Journal Article] Upper Silurian and Devonian pelagic deep-water radiolarian chert from the Khangai. Khentei belt of Central Mongolia : Evidence for Middle Paleozoicsubduction. accretion activity in the Central Asian Orogenic Belt (2009)
  • Author(s): Kurihara, T., Otoh, S., Kashiwagi, K., Minjin, Ch. Dorjsuren, B., Bujinlkham, B., Sersmaa, G., Manchuk, N., Niwa, M., Tokiwa, T., Hikichi, G., Kozuka, T.
  • Journal Title: Journal of Asian Earth Sciences Volume: 34 Pages: 209-225
• [Journal Article] Silurian-Devonian radiolarians and tectonic history of an accretionary complex in the Khangai-Khentei belt (2009)
  • Author(s): Kurihara, T., Tsukada, K., Otoh, S., Kashiwagi, K., Minjin, Ch., Sersmaa, G., Manchuk, N., Dorjsuren, B. and Bujinlkham B.
  • Journal Title: Mongolian Geoscientist Volume: no.35 Pages: 13-14
• [Journal Article] New age data and tectonic setting of igneous rocks in the Ulaanbaatar area (2009)
  • Author(s): Khishigsuren, S., Otoh, S., Munkhbat, B. and Ohto, Y.
  • Journal Title: Mongolian Geoscientist Volume: no.35 Pages: 51-56
• [Journal Article] 古生代の海洋プレート層序復元に基づくモンゴル.オホーツク海の初期進化過程の解明 (2008)
  • Author(s): 栗原敏之・束田和弘・大藤茂・柏木健司・Minjin, Ch.・Dorjsuren, B.・Manchuk, N.・Sersmaa, G.・Bujinlkham, B.
  • Journal Title: 平成19年度深田研究助成研究報告 Pages: 103-116
• [Journal Article] GeochemicalCharacteristics of the Basalts in an Accretionary Complex
  • Author(s): Tsukada, K., Yamamoto, K., Kurihara, T., Otoh, S., Minjin Ch., Sersmaa G., Manchuk N., Kashiwagi, K., Niwa, M. and Tokiwa, T.
  • Journal Title: Island Arc, submitted
• [Presentation] Permian peri-glacial deposits in the Harahorin area, north-central Mongolia (2011)
  • Author(s): Otoh, S., Fujimoto, T., Tsukada, K., Shimojo, M., and Sersmaa, G.
  • Organizer: 日本地球惑星科学連合2011年大会
  • Place of Presentation: 幕張
  • Year and Date: 20110000
• [Presentation] 277 Maの花崗岩ドロップストーンを含むモンゴル中北部ハラホリン地域の先中部ジュラ系 (2010)
  • Author(s): 藤本辰弥・下條将徳・大藤茂・束田和弘・Sersmaa G.・Manchuk N.・昆慶明・横山隆臣・平田岳史
  • Organizer: 日本地質学会中部支部2010年支部年会
  • Place of Presentation: 福井
  • Year and Date: 20100000
• [Presentation] モンゴル北部,中央アジア造山帯における複数回の剪断変形 (2010)
  • Author(s): 大藤茂・大音祐史・束田和弘・栗原敏之・Sersmaa G.・Manchuk N.・Minjin Ch.・平田岳史
  • Organizer: 日本地質学会中部支部2010年支部年会
  • Place of Presentation: 福井
  • Year and Date: 20100000
• [Presentation] モンゴル中央部ハンガイ.ヘンテイ帯ゴルヒ層の放散虫化石群集とチャートの地質時代 (2010)
  • Author(s): 栗原敏之・束田和弘・大藤茂・柏木健司・Minjin Ch.・Sersmaa G.・Dorjsuren B.・Bujinlkham B.・丹羽正和・常盤哲也・引地原野・小塚隆文
  • Organizer: 日本地質学会学術大会
  • Place of Presentation: 富山
  • Year and Date: 20100000
• [Presentation] モンゴル国ハンガイ.ヘンテイ帯南縁沿いの左横すべり構造帯 (2010)
  • Author(s): 大藤茂・小塚隆文・栗原敏之・束田和弘・Minjin Ch.・Sersmaa G.・Dorjsuren B.・Bujinlkham B.
  • Organizer: 日本地質学会学術大会
  • Place of Presentation: 富山
  • Year and Date: 20100000
• [Presentation] Pre. Middle Jurarssic bed with 277-Ma granite dropstones in the Harhorin area, north-central Mongolia (2010)
  • Author(s): Otoh, S., Fujimoto, T., Shimojo, M., Tsukada, K., Minjin, Ch., Sersmaa, G., Manchuk, N., Kon, Y., Yokoyama, T. D., and Hirata, T.
  • Organizer: 日本地質学会学術大会
  • Place of Presentation: 富山
  • Year and Date: 20100000
• [Presentation] モンゴル国、ウランバートル地域における石炭系の再定義 (2010)
  • Author(s): 鈴木稔弥・竹内誠・束田和弘・松沢希・Sersmaa G.・Manchuk N.
  • Organizer: 日本地質学会学術大会
  • Place of Presentation: 富山
  • Year and Date: 20100000
• [Presentation] Structure of the eastern Khangai-Khentei belt, Mongolia (2010)
  • Author(s): Tsukada, K., Otoh, S., Kurihara, T., Dorjsuren, B., Minjin Ch., Sersmaa G. and Manchuk N.
  • Organizer: 日本地質学会学術大会
  • Place of Presentation: 富山
  • Year and Date: 20100000
• [Presentation] Devonian radiolarian biostratigraphy of pelagic chert facies in Mongolia and Thailand (2010)
  • Author(s): Kurihara, T.
  • Organizer: International Symposium "Toward a new aspect of Geological andEnvironmental studies of Mongolia,"
  • Place of Presentation: Ulaanbaatar, Mongolia
  • Year and Date: 20100000
• [Presentation] Description of the Carboniferous sandstone in the Ulaanbaatar area (2010)
  • Author(s): Suzuki, T., Tsukada, K. and Takeuchi, M.
  • Organizer: International Symposium "Toward a new aspect of Geological and Environmental studies of Mongolia,"
  • Place of Presentation: Ulaanbaatar, Mongolia
  • Year and Date: 20100000
• [Presentation] Sedimentary facies and stratigraphy of the Carboniferous system in the north of Ulanvaatar, Mongolia (2010)
  • Author(s): Takeuchi, M.
  • Organizer: International Symposium "Toward a new aspect of Geological and Environmental studies of Mongolia,"
  • Place of Presentation: Ulaanbaatar, Mongolia
  • Year and Date: 20100000
• [Presentation] Re-division of the eastern Khangai-Khentei belt, Mongolia (2010)
  • Author(s): Tsukada, K. and Otho, S.
  • Organizer: International Symposium "Toward a new aspect of Geological and Environmental studies of Mongolia,"
  • Place of Presentation: Ulaanbaatar, Mongolia
  • Year and Date: 20100000
• [Presentation] モンゴル中部のウランバートル・テレーンを構成する古生代砕屑岩の起源 (2009)
  • Author(s): 足立守・束田和弘・Sersmaa G.・Minjin C.
  • Organizer: 日本応用地質学会中部支部研究発表会
  • Place of Presentation: 名古屋
  • Year and Date: 20090000
• [Presentation] ウランバートル近傍の石炭紀礫岩中の含パンペリー石酸性火成岩礫および砂岩中の含パンペリー石岩石片の起源とその意義 (2008)
  • Author(s): 足立守・束田和弘・吉田英一・Dorjsuren B.・Sersmaa G.・Majigsuren U.・Minjin C.
  • Organizer: 日本地質学会
  • Place of Presentation: 秋田
  • Year and Date: 20080000