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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 鍾孫霖 | |
| dc.contributor.author | Chien-Hui Hung | en |
| dc.contributor.author | 洪千惠 | zh_TW |
| dc.date.accessioned | 2021-06-13T15:19:25Z | - |
| dc.date.available | 2008-07-24 | |
| dc.date.copyright | 2008-07-24 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-24 | |
| dc.identifier.citation | Adams, D. D., Burns, L.E., Pessel, G.H., Little, T.A., Newberry, R.J. & Flynn, L.R. (1985) Preliminary geologic map of the central Talkeetna Mountains, Alaska: Alaska Division of Geological and Geophysical Surveys, Public Data File 85-20.
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Early Triassic (Smithian) ammonites of paleoequatorial affinity from the Chulitna terrane, south-central Alask. US Geological Survey Professional Paper, 1121-B, 5. Nir-El, Y. & Lavi, N. (1998). Measurement of the half-life of Lu-176. Applied Radiation and Isotopes, 49(12), 1653-1655. Nokleberg, W. J., Patchett, P. J. & Wilson, F. H. (1994). Geology of south-central Alaska. The Geology of Alaska, G-1, 311-366. Patchett, P. J. & Tastumoto, M. (1981). Lu/Hf in Chondrites and definition of a chondritic hafnium growth curve. Lunar Planet. Sci. XII, Part 2, 822-824. Patiño Douce, A. E. (1997). Generation of metaluminous A-type granites by low-pressure melting of calc-alkaline granitoids. Geology, 25, 743-746. Pavlis, T. L. & Sisson, V. B. (1995). Structual history of the Chugach metamorphic complex in the Tana River region, eastern Alaska. Geological Society of America Bulletin, 107(11), 1333-1355. Pearce, J. A., Harris, N. B. W. & Tindle, A. G. (1984). 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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37112 | - |
| dc.description.abstract | Plutonic rocks in the Central Alaska Range were emplaced during important
tectonic events including the end of Late Cretaceous-Paleocene arc magmatism, the terminal phase of terrane accretion, the Kula ridge subduction, regional strike-slip faulting, oroclinal rotation of western Alaska, and Eocene resumption of arc magmatism along the proto-Aleutian arc system. Here we report the first set of LA-ICPMS and SHRIMP zircon U-Pb ages for granitoids from (1) the McKinley Sequence, (2) the Composite Plutons and (3) the Foraker Pluton, central Alaska Range. Two peraluminous granites from the McKinley Sequence yielded 206Pb/238U ages of 62±1 and 60±1 Ma; an A-type granite from the same area gave age of 64±1 Ma. Two granodiorites from the Composite Plutons and a granite from the Foraker Pluton gave ages of 69±1, 67±1 and 37±1 Ma, respectively. The age results indicate that the Composite Plutons and the McKinley Sequence granites are older than previously reported and that the McKinley granites can be divided into two magma suites that consist of peraluminous and A-type compositions occurring at ca. 62-60 and 64 Ma, respectively. Nd and Sr isotope data suggest a temporal change in the magma’s isotopic compositions, with the Foraker granites showing higher and more heterogeneous εNd(T) values that range from about +6 to -2 and the Composite and McKinley Sequence granitoids showing lower and less heterogeneous εNd(T) values from +1 to -3. Besides, zircon Hf isotopic data of the dated samples show that a granite from the Foraker plutons has the highest zircon εHf(T) values from +15 to +10, in contrast to the Composite plutons that show apparently lower zircon εHf(T) values from +4 to -3. Peralumous and A-type granites from the McKinley Sequence have zircon εHf(T) values from +2 to -5 and +8 to +1, respectively. The Composite and McKinley Sequence plutonic rocks are interpreted as products of the ending phase of Late Cretaceous-Paleocene arc magmatism. The peraluminous granites from the McKinley sequence may have been sourced from the remnant mantle wedge, previously responsible for generating the Composite plutons and earlier arc magmas. Besides, generation of the A-type granites can be attributed to the v oroclinal rotation of western Alaska and ridge subduction that started around 64 Ma, a mechanism that may also have resulted in broadly coeval volcanism in the nearby Cantwell basin and northern Talkeetna Mountains. The Foraker pluton are interpreted as the product of renewed magmatism along the proto-Aleutian arc, in response to north or northwestward subduction of the Pacific plate during 45-30 Ma. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T15:19:25Z (GMT). No. of bitstreams: 1 ntu-97-R95224108-1.pdf: 6861041 bytes, checksum: f5801985ec1127186d6537c155197490 (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | 致謝....... i
中文摘要 ii 英文摘要 iv 目錄....... vi 圖目....... viii 表目....... ix 一、緒論 1 1.1 區域地質背景 1 1.1.1 Wrangellia composite terrane 1 1.1.2 Southern margin composite terrane 2 1.1.3 Kahiltna assemblage 3 1.1.4 Composite岩體、McKinley Sequence與Foraker岩體簡介 4 1.1.4.1 Composite岩體 4 1.1.4.2 McKinley Sequence 4 1.1.4.3 Foraker岩體 4 1.2 晚白堊紀至新生代於南阿拉斯加的岩漿活動 5 1.2.1 Late Cretaceous and early Tertiary magmatism 6 1.2.2 Middle Tertiary magmatism 6 1.2.3 Late Cenozoic volcanism 6 1.3 研究動機與目的 7 1.3.1 研究動機 7 1.3.2 研究目的 8 二、分析方法 9 2.1 岩樣採集位置 9 2.2 岩石薄片觀察 11 2.3 主量元素分析 11 2.3.1 主量元素分析步驟 11 2.3.2 燒失量測量 12 2.4 微量元素分析 12 2.4.1 微量元素測量之樣本處理 12 2.4.2 以ICP-MS測量USGS標準樣結果 13 2.5 鍶-釹同位素組成分析 16 2.5.1 標本前置處理 16 2.5.2鍶-釹同位素化學分離流程 16 2.5.2.1 第一分離柱 17 2.5.2.2 鍶純化分離柱 18 2.5.2.3 第二分離柱 18 2.5.3 以MC-ICP-MS測量標準樣結果 20 2.6 鋯石鈾-鉛定年分析 22 2.6.1 LA-ICP-QMS樣品靶(target)的製備 22 2.6.1.1鋯石的黏貼 22 2.6.1.2環氧樹脂的配置與灌注 22 2.6.1.3打磨與拋光 23 2.6.1.4樣品靶的顯微照相 23 2.6.2 SHRIMP樣品靶(target)的製備 24 2.6.3 鈾-鉛定年分析 24 2.7 鋯石鉿同位素分析 25 三、南阿拉斯加McKinley Sequence及相鄰岩體分析結果 28 3.1 定年資料 28 3.1.1 McKinley Sequence、Composite岩體與Foraker岩體 28 3.1.2 Reindeer Hills與Matanuska Valley 29 3.2 地球化學分析結果 39 3.2.1 Composite岩體 39 3.2.2 McKinley Sequence 46 3.2.3 Foraker岩體 49 3.3 鍶-釹同位素分析結果 50 3.4 鋯石鉿同位素分析結果 54 四、南阿拉斯加McKinley Sequence及相鄰岩體之岩石成因 59 4.1 火成岩與地質事件年代對比關係 59 4.2 鍶-釹同位素討論 61 4.2.1 Composite岩體與McKinley Sequence 61 4.2.2 McKinley Sequence中的A型花崗岩 62 4.2.3 Foraker岩體 62 4.2.4 與相鄰岩體對比 64 4.3 岩石成因 66 4.3.1 Late Cretaceous (emplacement of the Composite plutons) 66 4.3.2 Early Tertiary (emplacement of the McKinley Sequence) 66 4.3.3 Mid-Tertiary (emplacement of the Foraker pluton) 67 五、結論 69 六、參考文獻 71 | |
| dc.language.iso | zh-TW | |
| dc.subject | 阿拉斯加山脈 | zh_TW |
| dc.subject | 麥金利系列岩體 | zh_TW |
| dc.subject | 鋯石鈾鉛定年 | zh_TW |
| dc.subject | 鍶釹鉿同位素 | zh_TW |
| dc.subject | the McKinley Sequence | en |
| dc.subject | zircon U-Pb dating | en |
| dc.subject | Alaska Range | en |
| dc.subject | Sr-Nd isotopes | en |
| dc.subject | Hf isotope | en |
| dc.title | 阿拉斯加麥金利系列岩體之鋯石定年與地球化學研究 | zh_TW |
| dc.title | Zircon U-Pb Ages and Geochemical Characteristics of the McKinley Sequence and Associated Plutons, Central Alaska Range | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 江博明,陳中華,藍晶瑩,羅清華 | |
| dc.subject.keyword | 阿拉斯加山脈,麥金利系列岩體,鋯石鈾鉛定年,鍶釹鉿同位素, | zh_TW |
| dc.subject.keyword | Alaska Range,the McKinley Sequence,zircon U-Pb dating,Sr-Nd isotopes,Hf isotope, | en |
| dc.relation.page | 78 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-07-24 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 地質科學研究所 | zh_TW |
| 顯示於系所單位： | 地質科學系 | |
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