| Summary: | 碩士 === 國立臺灣師範大學 === 地球科學系 === 104 === Zircon occurs in almost all sedimentary deposits and may provide a link in understanding the source provenance and the depositional age. Detrital zircon U-Pb dating from 14 samples coming from 13 wells (C-9, C-10, C-16, S-1, T-1, P-21, F-35, W-1, W-4, E-1, C-6, K-1 and J-1) offshore southwestern Taiwan were performed by using LA-ICP-MS method. The youngest Detrital zircon U-Pb ages are: Samples from F-35 well (1300 m) is 88 Ma; Samples from Taixinan basin (3279、3315、3358、3671、3869 m) are 66, 45, 133, 42, 41 Ma; Samples from Penghu basin (2584、2399 m) are 45, 43 Ma; Samples from Penghu rifting (2029、2026 m) are 79, 83 Ma; Samples from Beigang high (805、3876 m) are 86, 74 Ma. These youngest age from detrital zircon U-Pb dating represent the deposit age or the oldest possible deposit age.
The samples from F-35 well were dominantly coming from local sedimentary source. The sedimentary provenance for C-9, C-10, C-16, C-6, S-1 wells were mainly derived from the neighboring regions or partially from the nearby Jiulong river region. The provenance of T-1 and P-21 regions were from probably ancient Yangtze river tributary in the early stage. After the uplift of the Wuyishan, the source region changed to the Jiulong river drainage area. The sedimentary provenance for W-1 and W-4 well were from Min river drainage area. The provenance for peak 118 Ma from K-1 and E-1 well was probably from the local source. And the provenance for the peak about 170 Ma from K-1 and J-1 was the local source.
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