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標題: | 西北蘇門答臘碎屑鋯石鈾鉛定年與鉿同位素研究 Detrital Zircon U-Pb and Hf Isotopic Study in Northwestern Sumatra, Indonesia |
作者: | Chun-Chieh Hsu 許鈞傑 |
指導教授: | 鍾孫霖(Sun-Lin Chung) |
關鍵字: | 碎屑鋯石,鈾鉛定年,鉿同位素,蘇門答臘, Detrital zircon,U-Pb dating,Hf isotope,Sumatra, |
出版年 : | 2016 |
學位: | 碩士 |
摘要: | In NW Sumatra, Tertiary sedimentary basins that occur in forearc and backarc settings with respect to the present-day subduction system were deposited in three major terranes, namely, the Woyla Nappe, the East Sumatra block, and the West Sumatra block. NW Sumatra represents the product of complex accretion/collision/subduction histories among these three terranes, which have originated from the eastern margin of Gondwanaland. To better understand the complex histories, we present a detrital zircon study in NW Sumatra that, together with our unpublished work on major magmatic rocks in the area, allow us to reach the following conclusions: (1) Detrital zircons from 14 samples (river sand or sandstone) in the forearc basin reveal seven age peaks at ~1050 Ma (n=74), ~550 Ma (n=65), ~214 Ma (n=138), ~131 Ma (n=14), ~100 Ma (n=65), ~52 Ma (n=238) and 17-0 Ma (n=303), respectively; (2) Detrital zircons from nine samples in the backarc basin show similar age populations; (3) The Late Triassic zircons, with εHf(T) values of -18 to 0, are sourced mainly from the Indosinian granitoids that are widespread in the East Sumatra block; (4) The less abundant Early Cretaceous zircons, with εHf(T) values of -5 to 0, are most likely from the West Sumatra block; (5) The Late Cretaceous zircons, with εHf(T) values of +11 to +16, are from the Woyla Nappe due probably to the Woyla accretion; (6) The Eocene and younger zircons, with εHf(T) values of +6 to +17, are from the initial stage and modern arc magmatic rocks related to the Indian Ocean plate subduction. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/50291 |
DOI: | 10.6342/NTU201601696 |
全文授權: | 有償授權 |
顯示於系所單位: | 地質科學系 |
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