東亞地函動力與板塊互動研究─雅魯藏布江流域及其鄰近地區構造地形分布、成因與年代之探討(II)
Date Issued
2005
Date
2005
Author(s)
DOI
932116M002010
Abstract
Tibet is created by continent-continent collision between India and Eurasia, which
occurred in 55 Ma. This event is still actively going on. The strain among Tibet
concentrates in a few zones, including Himalaya and its northern major sutures.
Except for the shortening, the escaping crusts toward east and south in the
southeastern Himalaya give significant strike-slip movements. This project aims to
the neotectonics in northern and eastern neighboring areas of the Namche Barwa
Syntaxis (NBS). Therefore two areas with abundant river terraces are selected as the
targets. One is located at middle reach of the Yalu-Zanbo river and its tributary,
Ni-Yang-Chu in the eastern area of city Lahsa. The other area is located further
downstream to over the big-turn, where another tributary, Cha-Yu river, flows into the
Yalu-Zanbo river. There are three general origins to develop river terraces: 1)
tectonically uplifting; 2) base-line drop caused by sea-level falling; 3) huge amount of
sediments provided by earthquake or extremely high precipitation. This project is
going to analyze the origins of the terraces developed in study area and to understand
how neotectonics acts over there.
This project will collaborate with the other principal investigators in CREATE to
work on the tectono-geomorphic features of eastern Tibet. We use GIS software PCI
to recognize the features and to produce the DEM by the Satellite ASTER imageries.
Although recent work has made some achievements, we still need new and more
Satellite imageries and relevant software because the quality of some imagery we
have is poor. Field investigation will be conducted when the potential features are
identified by the laboratory work. To further derive the rate of crustal movement,
dating methods of radiocarbon, optical stimulated luminescence (OSL), and
thermo-luminescence (TL) are applied.
Subjects
新地體構造運動
地理資訊系統
數值高程模型
碳十四定年
光螢光定年
熱螢光定年
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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