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研究生:陳昱宏
研究生(外文):Yu-Hung Chen
論文名稱:南橫梅山口-啞口地區之斷層磁測調查
論文名稱(外文):Magnetic Surveying of Faulting Between Meishankou and Yakou, Central Taiwan
指導教授:陸喬克
指導教授(外文):Charles Leiws
學位類別:碩士
校院名稱:國立成功大學
系所名稱:資源工程學系碩博士班
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:英文
論文頁數:86
中文關鍵詞:殘餘強度磁場異常上衝構造梨山斷層背衝斷層台灣地體構造
外文關鍵詞:Lishan FaultBackthrustMagnetic AnomaliesPop-Up StructureTectonic Provinces of TaiwanResidual Intensity
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摘要

梨山斷層,許多研究相信它為一朝西傾之斷層,而其他人相信它為朝東傾之逆斷層。雖然關於梨山斷層有很多的研究,但在中央山脈的深部和人跡不容易到達的地方始終缺乏完善的資料,加上梨山斷層的南段在玉山以南即不太明確。本研究的目的將依據地球物理磁測的方法證明南橫梅山口至啞口的區域中梨山斷層的存在,並更確實了解此區域地下的岩層性質與地質構造。
由170個全磁場強度的量測資料,經標準校正後得到本研究區的殘餘磁場分佈圖、分佈剖面,以及三個基岩構造模型。根據本研究建構之模型認為,梨山斷層可能為逆衝斷層時,雪山山脈為以屈尺斷層及梨山斷層危界的上衝構造;或是向東傾之逆斷層;或梨山斷層為朝西傾之正斷層造成半地塹構造。殘餘磁場分佈圖和地表露頭指出了本區九條可能的斷層及斷層帶,由西向東為:土�}灣斷層、新關斷層、檜谷斷層、梨山斷層、大關山斷層和介於土�}灣與大關山斷層間至少四條斷層組成之斷層帶。根據本研究的模型指出,梨山斷層應為一朝西傾之斷層,並且為一逆衝構造。
ABSTRACT

The nature of the southern extension of the north-northeast trending Lishan Fault is controversial. Some researchers believe it to be a west-dipping fault, whereas others believe it to be an east-dipping fault. Although we have many studies about the Lishan Fault, information regarding the central part of the Lishan Fault is extremely limited because outcrops along the Lishan Fault are discontinuous and often difficult to access. The purposes of this study are to define the location of the Lishan Fault in the Meishankou-Yakou area and to better understand the subsurface geology of this area by using total magnetic intensity surveying and modelling of the residual magnetic field. These results will be analyzed with respect to current geologic thinking to better understand the fault’s relationship to the overall plate tectonic setting of Taiwan.
The Earth’s total magnetic intensity was recorded at one hundred and seventy stations along an east-west survey line. Standard corrections, such as IGRF and diurnal adjustments, were applied to each station. A contour map of the residual data and three basement models of the residual data profile were produced. From analysis of the models, the residual profile, and surface outcrops, we suggest that the Lishan Fault may be an overturned east-dipping thrust fault, or it may be a pop-up structure which is bounded by the east-vergent Lishan thrust fault and by the west-vergent Chuchih thrust fault, or an east-vergent thrust fault, or a normal west-dipping fault making a half-graben. The magnetic residual data and surface outcrops also indicate nine possible faults or fault zones in the study area (from west to east) : Tulungwan Fault, Singuan Fault, Keiku Fault, Lishan Fault, Daguanshan Fault and a fault zone (four un-named faults) between the Tulungwan and Daguanshan faults. From the magnetic models, there is evidence for westward dip on the Lishan Fault, and the favored interpretation is that it is a backthrust.
TABLE OF CONTENTS
Abstract I
摘要 III
Acknowledgements IV
Table of contents V
Chapter I. Introduction 1
Chapter II. Geologic Setting 6
Chapter III. Magnetic Method 10
A. Geomagnetic field 11
B. Magnetism and magnetic susceptibility of rocks and minerals 15
C. Data reduction 17
Chapter IV. Methodology 20
A. Field Reconnaissance 21
B. Dip & Strike 21
C. Outcrop studies 22
D. Magnetic surveying 23
Chapter V. Results 32
A. Projection of stations to straight line 32
B. Residual magnetic intensity profiles 33
C. Outcrop susceptibility 34
Chapter VI. Discussion 35
A. Magnetic residual contour map 35
B. Geologic models 37
Chapter VII. Conclusion 41
References 42
List of Figures 49
Figures 51
List of Tables 77
Appendix I. Magnetic intensity data 79
Appendix II. Place names 85
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