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1
題名:Acid Mine Drainage in the Chinkuashih-Shuinantung Area    
金瓜石─水湳洞地區之酸性礦山排水
著者:Louis L. Tsai(蔡龍珆) ;Chow-Son Chen(陳洲生) ;Li-Chung Sun(孫立中)
出版地區:台灣
出版城市:台北市
學科:地球科學
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:2卷4期(1991.12)
頁碼:297-316
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

金瓜石─水湳洞地區地表地層以中新世南港層?主,自晚上新世起之地殼運動造成多條高角度斷層,並將石底層抬升至地表出露,進而導致更新世石英安山岩之侵入與熱水換質形成之金、銅礦體;礦床分佈以測區南側之本山礦體?主,多?硫化金屬礦,?造成酸礦排水之典型礦體。測區主要河川?九份溪主、支流,逕流大抵與斷層線相近,顯示受斷層作用形成破碎帶後匯流成河。 測區經實地勘察後,擇定於金瓜石本山五坑坑口、七坑坑口、水湳洞南側海邊近本山七坑坑口排水孔處、水湳洞東側及西側、九份溪主流(上游、中游、下游)與九份溪支流採取地表水樣及土樣。分別進行pH?、水溫、濁度、電導度、溶氧量和多項離子濃度之地化分析。結果指出本山五坑、七坑二排水口處酸性強、金屬含量高、電導度強,表現酸性礦山排水效應。 以20公尺方型共圈之暫態電磁波法測勘,共計49點,各測點資料施以一維逆推,可以四層低─高─低─低電阻之電性地層模型擬合之,有效探查深度約?5公尺至50公尺。各層地電阻分佈顯示電性地層不連續面與斷層構造有關,且?地下水良好通路,地下水流向則大抵均匯流後朝東北方向移動出海。
The Chinkuashih-Shuinantung area is mainly composed of outcrops from the Miocene Nankang Formation. Crustal movements after the late Pliocene have led to several high-angle faults and lifted the Shitih Formation to the surface. During the Pleistocene, dacite intruded into Miocene sediments and thereafter hydrothermal gold-copper ore deposits were formed. These deposits are composed mostly of metal sulfides, including pyrite, enargite, galena, tetrahedrite, and sphalerite, together with limited native gold. All these sulfides may produce acid mine drainages. The river bed course of the Chiufen Chi is rather close to the fault traces, indicating a close relationship between water flow systems and tectonic movements. Water and soil samples were collected from several selected sites, including the upper, middle, and lower stream areas of the Chiufen Chi; along with the west, south, and east banks of the Shuinantung Bay; in addition, mine waters drained directly from the Penshan 5th adit and 7th adit were also collected near their portals. Geochemical data such as pH value, water temperature, turbidity, conductivity, dissolved oxygen, and selected ionic concentrations, were measured later. All samples were collected and analyzed during each season of a year. The results indicate that water drained from the two mine adits and the lower stream area of the Chinfen Chi exhibit low pH values, high metal (esp. Cu and Fe) and sulfate contents, and great conductivities. The acid mine drainage effect is very obvious, especially during the rainy season. The Transient Electro-Magnetic (TEM) method, using square loops 20 m on aside, was also applied in this area for prospecting purposes. Measured transient voltages were inverted in terms of 1-D models. Four-layered models consisting of low-high-low-low resistivity patterns best fit the 49 coincident loop data. The effective exploration depth was between 5 m to 50m. Furthermore, resistivities measured along the Chiufen Chi varied with the season, indicating high porosity and permeability in rocks underlying the study area, probably due to ore mineralization, faults or joints; on the other hand, resistivities measured along the Shuinantung Bay are not affected by seasonal change, indicating a saturated aquifer underneath the area near the sea.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 2卷4期 (1991.12)
Lateral Variations in Upper Mantle Structure of the Philippine Sea Basin/ Guey-Kuen YuWen-Yen Chang
Acid Mine Drainage in the Chinkuashih-Shuinantung Area/ Louis L. TsaiChow-Son ChenLi-Chung Sun
A Note on the Correlation Between B-Value and Fractal Dimension from Synthetic Seismicity/ Jeen-Hwa Wang
Earthquake Sounds From Aftershocks Following the 1986 May 20 Hualien Earthquake/ Yet-Chung ChangCheng-Sung WangKuo-Liang Wen
Solar Activity Dependence on Lunar Daily Variations of the Ionospheric Total Electron Content Near the Equatorial Anomaly Crest/ Yinn-Nien Huang
Observational Study of a Microburst-Producing Storm Part Ⅳ: Fine Scale Analysis/ Yeong-Jer Lin
 
   
 
   

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