2018-02-022024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681468摘要：本計畫為執行中央地質調查所推動之4年期「臺灣東北海域礦產資源潛能調查－震測及地熱流調查研究」工作，以震測與地熱流調查在臺灣東北海域南沖繩海槽進行金屬礦產開發潛能之調查與探勘研究，一以了解東北海域受海底火山活動產生的熱液換質作用是否亦有金屬硫化礦物的資源潛能，二則以震測與地熱流調查資料進而討論南沖繩海槽的地質背景與地體構造形貌，來推測地質活動作用在東北海域金屬礦產生成中所扮演的角色。由「總計畫與礦產資源調查成果資料庫」負責整個計畫之統整、規劃與協調工作，並且維護與更新東北海域礦產資源調查成果資料庫及資訊網，已達到調查成果資料保存目的外，今年度工作也將會彙整過去兩年在調查區域A區的各項工作收集成果，整編已調查區域的區域地形、構造及重要調查站位的分布圖，此外也將協助下列三個分項計畫工作之進行： (1)反射震測與海底回聲剖面調查研究：本年度將依上、下年度執行不同的計畫內容。前半年工作重點將持續對已收集之資料進行進一步處理、分析與解釋，包含了105與106年度收集之2維多頻道反射震測資料，以及106年度在調查區域A區之南沖繩海槽張裂中心收集之3維震測資料體。後半年度則規劃於臺灣東北海域調查區域B區2維多頻道反射震測調查內容，並進行其資料處理、分析、模擬與解釋，藉以了解此區域的地質背景，以協助完成臺灣東北海域礦產資源潛能的評估工作。(2)地熱流調查與流體移棲模式研究：為瞭解南沖繩海槽地區地熱流的分布，本年度上半年持續將新的量測結果整編入臺灣東北海域所有地熱流測量資料，更新地溫梯度、熱導係數等資料分析結果。下半年則將隨同震測航次出海，針對選定的重點站位，如G1、VB1、VB2站，進行精密地熱流量測，以建置3維熱傳導及對流數值模型。亦將利用溫度流體偶合解析解分析技術進行熱流模型模擬，並加以應用。(3)地質構造、火成活動與沉積特徵研究：利用彙整好的計畫區域發表之文獻與報告，以及解釋並綜整臺灣東北海域調查區域B區所有反射震測資料，建立南沖繩海槽(B區)地體構造、火成活動與沉積環境的地質初始模式。 過去兩年度本計畫在臺灣東北海域調查區域A區進行了詳細的震測與地熱流的觀測與調查，本年度計畫除了會綜整各項過往的調查資料與結果，對調查區域A區的高潛能熱液礦床區域進行進一步的分析研究，並會往西在南沖繩海槽的B區進行調查與資料收集。期望能更在南沖繩海槽內找到更多高潛能礦產區域，並進行海底礦產資源評估，以及瞭解此區域內礦物生成模式與地質背景及地體構造活動之可能關聯性。<br> Abstract: This proposal is the third year of the 4-year marine mineral resource investigation project of the Central Geological Survey entitled “Investigation of marine mineral resource potential in the northeastern Taiwan offshore areas: Seismic and heat flow studies”. Seismic, heat flow and geothermal investigations will be carried out in the areas offshore northeastern Taiwan with 2 major goals: 1. To explore the mineral resource potential in the investigation area where submarine volcanic activities are prevailing; 2. To understand the relationships between geological/tectonic processes and mineral resources in the study area. To achieve these goals, a team was formed that will carry out the field investigation and data analyses under one master project and 3 sub-projects. The master project is responsible for project planning and coordination among different sub-projects, also to develop and maintain a marine mineral resource database. The 3 sub-projects and their respective roles are: (1) Seismic reflection and chirp sonar investigations: Multichannel 2D seismic reflection data and underway chirp sonar data in the survey area B will be collected, processed and analyzed. This sub-project will also analyze and interpret seismic profiles and chirp sonar data, also the pseudo-3D dataset collected in 2017 to understander further on volcanic activities, hydrothermal vents and structural and sedimentary processes. (2) Heat flow investigation and fluid migration modeling: this sub-project will conduct at least 5 heat flow measurements at selected stations in the hydrothermal hot spots, such as G1, VB1 and VB2. The data will be processed and analyzed in the hope to construct 3D geothermal model. In addition, the new data will be integrated with all the existing heat flow data in the investigation area to understand the regional geothermal distribution, geothermal gradients and thermal conductivities at the measurement sites will be derived as well. This sub-project also plans to construct 3D geothermal field model from the existing geothermal data and to conduct thermal fluid migration modeling. (3) Stratigraphic analyses and sedimentary characteristics of the Southern Okinawa Trough: this sub-project will try to understand the evolution of tectonic architectures and sedimentary environments from interpretation of the seismic reflection profiles, and ODP well data in the study area. This sub-project will also build an initial model of hydrothermal system with tectonic structure, volcanic activities and stratigraphy by summerizing geological and geophysical data. Overall, in the third yaer of this project, we aim to define the distribution of submarine mineral resources and to evaluate their development potential. Build on last year’s results, the high potential hydrothermal venting areas in box A will be further istudied.礦產資源臺灣東北海域反射震測熱流地溫梯度地熱流量測地體構造沉積環境Mineral ResourceOffshore Northeastern TaiwanSeismic investigationHeat flow measurementGeothermal gradientTectonic frameworkSedimentary environment臺灣東北海域礦產資源潛能調查-震測及地熱流調查研究(3/4)