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Stratigraphy and geological structure of the Paleozoic system around Ulaanbaatar, Mongolia
https://doi.org/10.18999/bulnum.028.01
https://doi.org/10.18999/bulnum.028.01c70d7839-4a04-4887-92b6-7635f114f395
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
No28-1.pdf (11.0 MB)
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| アイテムタイプ | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2013-06-11 | |||||
| タイトル | ||||||
| タイトル | Stratigraphy and geological structure of the Paleozoic system around Ulaanbaatar, Mongolia | |||||
| 言語 | en | |||||
| 著者 |
TAKEUCHI, Makoto
× TAKEUCHI, Makoto× TSUKADA, Kazuhiro× SUZUKI, Toshiya× NAKANE, Yuki× GONCHIGDORJ, Sersmaa× NURAMKHAAN, Manchuk× KONDO, Tomoyuki× MATSUZAWA, Nozomi× NURAMKHAAN, Bakhat× SODNOM, Khishigsuren× GANTUMUR, Onon× KATSURADA, Yusuke× KAWAHARA, Kentaro× HASHIMOTO, Masami× YAMASAKI, Shoko× MATSUMOTO, Asuka× BORKHUU, Oyu-Erdene× MAGNAIBAYAR, Bulgantsengel× SYERYEKHAAN, Kundyz× LUVSANDORJ, Enkhchimeg× RANJIN, Ganzorig× GERELBAATAR, Myagmarsuren× OTGONBAATAR, Jamiyandagva× MUNKHJARGAL, Molomjamts |
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| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Recent mapping study in the Ulaanbaatar area has revealed that the geology around Ulaanbaatar previously reported should be revised in regard to stratigraphy and geological structure. Here, the new division of strata and geological structure are presented. Detailed field mapping with careful observation of sedimentary structures such as grading, loadcast, cross lamination, channel structure, and so on which indicate stratigraphic top have been carried out. The results show that many parts of strata were overturned and the geological structure is characterized with overturned folds with south vergence. In particular, the Paleozoic system is newly divided into two accretionary complexes (Altan-Ovoo & Orgioch-Uul Formation and Gorkhi Formation) and a shallow marine formation. Most of the previous shallow marine Carboniferous system is replaced by the two accretionary complexes and the shallow marine Carboniferous system which occurs with fossils indicating shallow sea environment only distributed in narrow area between two faults, although the latter has been regarded as extensively distributed around Ulaanbaatar. The geology suggests that the shallow marine sediments overlie the accretionary complex (Altan-Ovoo & Orgioch-Uul Formation), unconformably. The accretionary complexes are classified with quite different from the stratigraphy observed in clastic rocks. The Gorkhi Formation is composed of chert, siliceous shale and clastic rocks dominating massive and thick-bedded sandstone in ascending order. The Altan-Ovoo & Orgioch-Uul Formation consists of basalt, chert, siliceous shale and clastic rocks dominating thick- to thin-bedded sandstone and mudstone in ascending order. Furthermore, it is found out that the previous Gorkhi Formation in the northwest area and the previous Carboniferous system in the central south area are regarded as weakly metamorphosed and strongly deformed equivalents to the Altan-Ovoo & Orgioch-Uul Formation. Geological structure of these strata represents south vergence such as north-dipping thrust and fold-axial plane. The fact strongly suggests that north-directing subduction formed these geological structures. | |||||
| 言語 | en | |||||
| 出版者 | ||||||
| 出版者 | 名古屋大学博物館 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | departmental bulletin paper | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| ID登録 | ||||||
| ID登録 | 10.18999/bulnum.028.01 | |||||
| ID登録タイプ | JaLC | |||||
| ISSN（print） | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 1346-8286 | |||||
| 書誌情報 |
ja : 名古屋大学博物館報告 巻 28, p. 1-18, 発行日 2012-12-25 |
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| 著者版フラグ | ||||||
| 値 | publisher | |||||
| URI | ||||||
| 識別子 | http://hdl.handle.net/2237/18186 | |||||
| 識別子タイプ | HDL | |||||
