台灣東北角海岸萊萊地區煌斑岩脈及其圍岩之構造地質研究

Structure Geology Analysis of Lamprophyre Dike and Its Wall Rocks at Lailai Area, Northeastern Coast of Taiwan

黃蜀圓(Shu-Yuan Huang)

指導教授 ： 羅偉

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2005年)

https://doi.org/10.6841/NTUT.2005.00318

摘要

臺灣位處歐亞板塊及菲律賓海板塊的互撞擠壓之造山帶，由於特殊的地體構造背景，地殼活動與各種地質作用劇烈，各種地質構造發達。尤其在台灣東北角地區，如萊萊、雙溪、頭城、金面山以至蘇澳等地，都有許多更新世的侵入岩脈存在。這些岩脈彼此之間的生成機制，岩脈與圍岩之間的關係，以及之間的構造演化問題，在過去的研究著墨不多。本研究藉由探討萊萊地區的節理狀態與岩脈、斷層、破裂面及褶皺構造的相互關係，作為將來進一步檢視臺灣東北部地區地質構造演化與古應力關係之參考。
經由本研究對臺灣東北角萊萊海岸進行之節理位態分析、破裂面形式分析、褶皺構造與岩脈構造分析，可知萊萊海岸在一千萬年時由於地殼活動劇烈造成火成岩脈以雁行排列之方式入侵於砂頁岩互層之圍岩中。而後又受到東西方向之平移斷層作用造成部分岩脈重疊排列。因菲律賓海板塊與歐亞板塊碰撞之弧陸碰撞作用，形成本區圍岩之褶皺與一系列之平移斷層。由於地殼抬升與波浪侵蝕作用，岩層出露於今地表，因大地應力與解壓結果，造成本區主要之三組節理。此三組節理受岩性與區域構造之影響位態稍有變化。

關鍵字

萊萊岩脈 ； 地質構造 ； 節理 ； 斷層 ； 褶皺

並列摘要

Taiwan is situated at the collision and orogenic belt of the Eurasian plate and the Philippine Sea plate. For this special tectonic framework, Many conspicuous orogenic structures and volcaniam features were widespread in the rocks and are recorded in the tertiary strata.
There are many alkali basaltic dikes have been found in the Oligocene sedimentary strata exposed near Lailai, Shuangxi, Toucheng, Jinmianshan, and Suao of the northeastern coast of Taiwan.
The purpose of this study is hoped to provide some methods to identify the development sequence of the structures on the dike, such as fault, joint, and shear fractures in the coast near Lailai area. It is also provided some information available to explain the intrusive mechanism of the Lailai dike.

並列關鍵字

Lailai Dike ； Geological Structure ； Joint ； Fault ； Fold

參考文獻

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