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研究生:陳玉英
研究生(外文):Chen, Yu-Ying
論文名稱:臺灣西南高磁帶在臺灣中部消失原因之探討:二維磁性構造之模擬
論文名稱(外文):Possible causes for the vanishing of the high magnetic anomaly belt in central Taiwan: 2-dimensional magnetic simulation
指導教授:王正松王正松引用關係王天楷
指導教授(外文):Wang, ChengsungWang, Tan-Kin
口試委員:李昭興徐春田陳洲生鄭文彬王正松王天楷
口試委員(外文):Lee, Chao-ShingShyu, Chun-TienChen, Chow-SonCheng, Win-BinWang, ChengsungWang, Tan-Kin
口試日期:2016-01-18
學位類別:博士
校院名稱:國立臺灣海洋大學
系所名稱:應用地球科學研究所
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
論文出版年:2016
畢業學年度:104
語文別:中文
論文頁數:58
中文關鍵詞:台灣西南高磁帶磁力模擬磁源台灣造山運動
外文關鍵詞:high magnetic anomaly beltHMagnetic simulationMagnetic sourceCrustal deformation
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台灣地區磁力異常分布圖顯示,在台灣西南部沿著歐亞板塊大陸棚邊緣有一個高磁力異常帶(台灣西南高磁帶; High Magnetic Anomaly Belt, HMAB)。本論文從事與此高磁帶在台灣中部相關之磁力模擬,以瞭解其磁源構造及特性,特別是探討此高磁帶在台灣中部逐漸消失之原因。
Wu et al. (2007) 利用層析法以P波和S波走時以及大量的S­P 時間差求得一個台灣地區目前最細緻之波速構造數值檔。此波速構造應可反映台灣底下之細部構造。本論文之主要部份是利用在台灣島上所收集的高密度磁力資料,以Wu et al. (2007)之波速構造為依據,從事高磁帶下方二維磁源物質剖面之模擬,其目的是求取造成在台灣中部之高磁帶的磁源構造,並以之與相關之地質及地球物理等資料相比較,以探討台灣造山運動對高磁帶磁源構造在台灣中部之影響。根據橫切高磁帶(沿北緯23.5度)及沿高磁帶方向的磁力異常剖面逆推,在高磁帶下方大陸地殼中,順沿著高磁帶方向,存在一個具有相對高磁化率的磁源構造,推判應是台灣西南高磁帶之磁源,依其分佈及其高磁帶研究之文獻,應是南中國海盆擴張初期岩漿活動所留下的磁性岩石。此磁源構造因台灣造山運動所造成的地殼的變動而導致台灣西南高磁帶東北端物質的物理變化及大規模的磁性物質搬移或破壞應為台灣西南高磁帶在台灣中部逐漸消失的原因。

關鍵詞:台灣西南高磁帶、磁力模擬、磁源、台灣造山運動。

On the magnetic anomaly map of the Taiwan region, along the continental shelf edge off the southeastern Chinese continent, there exists a striking high magnetic anomaly belt (HMAB), trending nearly SW-NE, in the southwestern Taiwan region. It extends northeastward to central Taiwan and gradually vanishes there. In this thesis, the magnetic simulation beneath central Taiwan, including the HMAB and its vicinity, was performed, to understand the distribution of the magnetic susceptibility of material and study the causes of the vanishing of the HMAB.
Wu et al. (2007) established a comprehensive data set of 3-D seismic velocity structure beneath Taiwan by the tomographic method based on all the available P and S wave travel times together with S-P times (i.e., the differences between the S and P arrival times). This data set of velocity structure has better resolution than other existing models by the tomographic method, and therefore reflects more detailed crustal structure beneath Taiwan. In the main part of this paper, the 2-D magnetic simulation with geometry constrained by the velocity structure of Wu et al. (2007) was performed and compared with other geological and geophysical data for better understanding the nature of the magnetic source of HMAB and how it makes HMAB vanish. The simulation shows that there is a layer of material with high magnetic susceptibility (which should be the source of HMAB), situated near the center of the thick crust, along the trend of HMAB. This source layer should be the magmatic relic intruded along the continental shelf edge off the Chinese continent, during the initial stage of the opening of the South China Sea. The change of physical conditions or large-scale dislocation of the source materials, due to intensive and complicated crustal deformation, are the possible causes of the gradual vanishing of HMAB near its northeastern end.

Keywords: High magnetic anomaly belt, magnetic simulation, magnetic source, crustal deformation.

目次
誌謝……………………………………………………………………………………I
個人著作表…………………………………………………………………………II
中文摘要……………………………………………………………………………III
Abstract…………………………………………………………………………IV
目次…………………………………………………………………………………V
圖次…………………………………………………………………………VII
第一章 (個人著作表No.1) 橫切台灣西南高磁帶地區ㄧ個磁力基盤剖面之逆推及其地質意義…………………………………………………………………1
中文摘要……………………………………………………………………1
I. 緒言…………………………………………………………………………2
II. 台灣地區之地體構造與大陸棚邊緣之高磁力異常帶……………………2
III. 研究區域概述……………………………………………………………3
IV. 磁力基盤之逆推模型的建立……………………………………………3
V. 結論…………………………………………………………………………4
VI. 參考文獻……………………………………………………………………4
英文摘要………………………………………………………………………13
第二章 (個人著作表No.2)台灣西南高磁帶底下之板塊構造:磁力基盤模擬研究……………………………………………………………………………14
中文摘要…………………………………………………………………14
1. 緒言…………………………………………………………………15
2. 橫切台灣西南高磁帶的磁力異常剖面之逆推……………………15
3. 地質解釋及討論……………………………………………………16
4. 結論…………………………………………………………………16
5. 參考文獻……………………………………………………………16
英文摘要………………………………………………………………………24
第三章 (個人著作表No.3) MAGNETIC INVERSION FOR POSSIBLE CAUSES OF THE VANISHING OF THE HIGH MAGNETIC ANOMALY BELT IN CENTRAL TAIWAN……………………………25
ABSTRACT……………………………………………………………………25
I. INTRODUCTION…………………………………………………………26
II. RELATED GEOLOGY……………………………………………………29
III. GENERAL DESCRIPTION OF THE MAGNETIC INVERSION METHOD…………………………………………………………………31
IV. MAGNETIC INVERSION MODELS AND INTERPRETATION………35
1. Crossing the HMAB and structural provinces of central Taiwan………35
2. Along the trend of HMAB………………………………………………37
V. DISCUSSION OF POSSIBLE CAUSES FOR THE VANISHING OF THE HMAB………………………………………………………………………39
1. Implications of the locations of the HMAB and its magnetic source layer…………………………………………………………………………39
2. Tectonic activities implied by seismicity…………………………………43
3. Resetting of magnetic susceptibility………………………………………46
4. Large-scale horizontal dislocation of the source material…………………46
VI. CONCULSION……………………………………………………………49
REFERENCES…………………………………………………………………50
總結論……………………………………………………………………………54
參考文獻………………………………………………………………………55

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