2013 Fiscal Year Final Research Report
A study on the lateral growth of the Tibetan Plateau
| Project/Area Number |
22300314
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geography
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| Research Institution | The University of Tokyo |
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Principal Investigator |
IKEDA Yasutaka 東京大学, 理学(系)研究科(研究院), 准教授 (70134442)
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| Co-Investigator(Kenkyū-buntansha) |
KANO Ken'ichi 静岡大学, 学内共同利用施設等, 教授 (30090517)
ISHIYAMA Tatsuya 東京大学, 地震研究所, 助教 (90356452)
MIYAIRI Yosuke 東京大学, 大気海洋研究所, 研究員 (30451800)
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| Co-Investigator(Renkei-kenkyūsha) |
OKADA Shinsuke 東北大学災害科学国際研究所, 助教 (50626182)
ECHIGO Tomoo 地域地盤環境研究所, 研究員 (60450904)
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| Research Collaborator |
HE Honglin 中国地震局, 地質研究所, 教授
FU Bihong 中国科学院, 地質地球物理研究所, 教授
SHIRAHAMA Yoshiki 東京大学, 大学院理学系研究科, 博士課程学院生
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | 地形 / 山脈形成 / 地殻厚化 / アイソスタシー / 活断層 / 表面照射年代 |
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| Research Abstract |
In order to understand the process of the Tibetan Plateau's lateral growth, we first analyzed satellite imagery over the northeastern margin of the plateau and found a large-scale active anticlinorium (~40 km wide) in the Kumkol Basin north of the eastern Kunlun Mountains. Several steps of fluvio-glacial terraces are developed over the anticlinorium, and are folded and faulted due to activity of the anticlinorium. Quartz-grain samples were collected from these terraces, and were dated by the surface exposure dating method using cosmogenic radionuclides (10Be and 26Al). The growth rate of the anticlinorium thus determined is as high as ~1 mm/yr, indicating that the Kumkol Basin is now being incorporated into the Tibetan plateau.
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