利用碎屑鋯石探討菲律賓呂宋島之地體構造演化及恆春半島中新統之沉積物來源

蔡佳欣

doi:10.6342/NTU201700466

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利用碎屑锆石探讨菲律宾吕宋岛之地体构造演化及恒春半岛中新统之沉积物来源

Tectonic development and sediment provenances of the Luzon Island and Hengchun Peninsula from detrital zircon analysis

蔡佳欣 , 硕士　　导师：徐澔德　　

英文 DOI： 10.6342/NTU201700466

铀铅定年；铪同位素；碎屑锆石；沉积物源；吕宋岛；恒春半岛； U-Pb dating ； Hafnium isotope ； Detrital zircon ； Sedimentary provenance ； Luzon Island ； Hengchun Peninsula

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摘要 │ 参考文献 (101) │ 国际计量

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The Philippines and Taiwan are both in the western Philippine Sea Plate that has complicated tectonics. Located in the northern Philippine Archipelago that is an amalgamation of tectonic terranes, the Luzon Island is in the middle of two subduction zones. As the hanging wall of both sides of trench systems, the Luzon Island has an elusive tectonic structure beneath. The whole southeastern Asia is believed to be a critical area for accretionary orogeny and juvenile crustal formation in Cenozoic, but the comprehensive ages of the magmatic events and the evolution of the Luzon Island are not well constrained. In order to examine the magma properties in this area, this study analyzed U-Pb ages and hafnium isotopic ratios in detrital zircons from the Luzon Island. Moreover, north of the Luzon Island, the Hengchun Peninsula is also located on the eastern side of the Manila Trench. This implies the possibility that sediments in the Hengchun Peninsula may be originated from the Luzon Island since they both sit on the Philippine Sea Plate. Hence, this study also investigated the sedimentary relationship between the two places by the comparison of detrital zircon ages and geochemical properties. Furthermore, this study also constructed a paleogeography model for the Hengchun Peninsula.
Fourteen riversand samples were collected from the major rivers in the Luzon Island. The U-Pb ages of the detrital zircons show that the magmatic events mostly occurred in Eocene to Miocene and Quaternary in this area. However, some of the events in the central Luzon can be traced back to Mesozoic. Albeit the presence of old zircons, all the samples in Luzon Island show positive εHf(T) values that range from +10 to +20. These results indicate the Luzon Island is dominated by juvenile magma, and few continental material has been involved in the construction of this island. Thus, the Luzon Island could be an important locus for Asian accretionary orogenesis and Cenozoic crustal growth. In the Hengchun Peninsula, ten sandstone samples were collected in the Miocene Series. Their data demonstrate the detrital zircon ages are mostly older than Cenozoic and concentrate in Cretaceous to Jurassic, early Permian and even Precambrian. Moreover, the εHf(T) values for the samples in the peninsula are mostly negative. Since these data are significantly different from those of the Luzon Island, the results imply the Luzon Island is unlikely to be the sedimentary provenance of Hengchun. The zircon U-Pb ages of the Miocene Series in Hengchun could well correspond to the major magmatic events in southeastern China. Through the comparison with previous studies, the Miocene Series in the Hengchun Peninsula might come from Minjiang, Jiulongjiang, proto-Taiwan and a rifted continental fragment which is separated from SE China. Nevertheless, some of the younger zircons (30-15 Ma) should be originated from the m&eacute;lange in the accretionary prism in the east. These sediments were scratched up from the sea floor and moved to the eastern side of the trench during the subduction and collision in southern Taiwan.

参考文献 ( 101 ) 〈TOP〉

Andersen, T. (2002). Correction of common lead in U--Pb analyses that do not report 204Pb. Chemical Geology, 192(1), 59–79.
连结：
Andersen, T. (2005). Detrital zircons as tracers of sedimentary provenance: limiting conditions from statistics and numerical simulation. Chemical Geology, 216(3), 249–270.
连结：
Barrier, E., & Angelier, J. (1986). Active collision in eastern Taiwan: the Coastal Range. Tectonophysics, 125(1), 39–72.
连结：
Bellon, H., & Yumul Jr, G. P. (2000). Mio-Pliocene magmatism in the Baguio Mining District (Luzon, Philippines): age clues to its geodynamic setting. Comptes Rendus de l’Académie Des Sciences-Series IIA-Earth and Planetary Science, 331(4), 295–302.
连结：
Bellon, H., & Yumul, G. P. (2001). Miocene to Quaternary adakites and related rocks in Western Philippine arc sequences. Comptes Rendus de l’Académie Des Sciences-Series IIA-Earth and Planetary Science, 333(6), 343–350.
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DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。