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題名 | Fission Track Age Dating of Igneous Rocks and Silicified Sandstones from the Chilung Volcano Group, Northern Taiwan: Implication of Mineralization Events of the Chinkuashih Gold-Copper Deposits=臺灣北部基隆火山群火成岩與矽化砂岩之核飛跡定年及其對金瓜石金銅礦礦化作用之含義 |
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作者姓名(中文) | 陳正宏; 譚立平; 田蓉禮; 鐘三雄; 劉聰桂; | 書刊名 | 中國地質學會會刊 |
卷期 | 36:2 1993.04[民82.04] |
頁次 | 頁157-174 |
分類號 | 356.232 |
關鍵詞 | 火山群; 火成岩; 北部; 矽化砂岩; 金瓜石; 金銅礦; 核飛跡定年; 基隆; 臺灣; 礦化作用; |
語文 | 英文(English) |
中文摘要 | 從基隆火山群與金瓜石金銅礦礦化作用有關的四十四個火成岩及矽化砂岩中分離 出所含的鋯石及磷灰石作核飛跡定年分析。其中 35 個新鮮及礦化的石英安山岩標本顯示, 除基隆島為 0.3Ma 左右外, 兩種礦物之年代均分佈於很短暫的時間範圍( 1.4 至 0.9Ma ),但是九個有金銅礦的矽化砂岩標本卻顯示未有鋯石時鐘的重設現象,可能的原因為:( 1)金銅礦床的礦化溫度低於鋯石的封存溫度,(2)受熱的時間太短以致僅能使鋯石原有 的裂跡部分癒合。 根據核飛跡定年資料,推論金瓜合地區之礦化事件如下: 1.全區最大且最重要的的本山火成岩體約在 1.4 至 1.1Ma (± 0.1Ma )時形成。 2.另依據明礬石( alunite )的鉀氬定年, 沿南北向正斷層發展出的金銅礦化作用在 1.0 ± 0.1Ma 時發生。 3.本山以外較新期的侵入或噴出作用發生於 1.0 至 0.9Ma (± 0.07Ma )。 4.金礦礦化作用可能緊接著上述侵入作用發生在 0.8Ma 左右。 從鋯石的整體年代來看,矽化砂岩似可分成三群:(1)年老群( >100Ma ),代表矽化作 用影響最少者,相當於淺溫礦床(攝氏 150 至 200 度);(2)中間群( 75 至 50Ma ) ,可能相當於中溫礦床(攝氏 200 至 300 度); (3)年輕群( <33Ma ),應是受矽化 作用最劇烈者,為高溫礦床(攝氏 300 至 400 度)。 |
英文摘要 | The fission track method is used to date the age of contained zircons and apatites in the fresh and hydrothermally altered igneous rocks as well as silicified sandstones in the Chilung Volcano Group of northern Taiwan-the host rocks for the Chinkuashih gold-copper deposits. The results of 44 fresh and altered igneous rocks show that they were distributed in a short time span ranging from 1.4 to 0.9 Ma obtained from both zircon and apatite. Nevertheless, none of the 9 silicified sandstones with gold-copper ores at Chinkuashih indicates resetting of the zircon fission track clock. This is perhaps due to two reasons: (1) The mineralization temperatures for the gold-enargite deposits were lower than the closure temperature of zircon. (2) The heating period was too short to completely anneal the fission tracks registered in these zircons. According to the fission track dating data, the mineralization events of the Chinkuashih area can be summarized as follows: 1. Intrusion of the largest and the most important igneous body, the Penshan body, occurred between ca. 1.4 and 1.1 Ma (± 0.1 Ma ). 2. Gold-copper mineralization along the NS normal fault at 1.0 ± 0.1 Ma as indicated by a K-Ar dating of an alunite at Penshan where alunite and luzonite frequently formed successive concentric layers in ring ores. 3. Intrusion and extrusion of younger igneous rocks at 1.0 to 0.9 Ma (± 0.07 Ma ) in other areas at Chinkuashih. 4. Gold mineralization of the younger igneous rocks immediately after the last intrusion possibly occurred at about 0.8 Ma. Based on the pooled age of zircon, silicified sandstones can be divided into 3 groups: (1) The old group (>100 Ma), indicating the least affected by the silicification, can correspond to the epithermal deposits which perhaps formed from 150 to 200 ℃. (2) The medium group (75 to 50 Ma), most likely representing the mesothermal deposits, was thought to form from 200 to 300 ℃. (3) The young group (<33 Ma) or the most affected one, was generally formed between 300 and 400 ℃, indicative of hypothermal deposits. |
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