Testing inferences from palaeocurrents: application of zircon double-dating to Miocene sediments from the Hengchun Peninsula, Taiwan

作者：Kirstein Linda A^*; Carter Andrew; Chen Yue Gau

来源：Terra Nova, 2010, 22(6): 483-493.

DOI：10.1111/j.1365-3121.2010.00970.x

Detrital zircon provenance studies that combine low-temperature fission-track and high-temperature U-Pb single-grain age dating are powerful in constraining sediment provenance by documenting the tectonothermal evolution of the sediment source(s). We apply these techniques to Miocene (12-6 Ma) sandstones of the Hengchun Peninsula, southern Taiwan, which, based on diametrically opposite palaeocurrents, have a controversial provenance. U-Pb grain ages range from the Miocene (8 Ma) to Archaean (2.5 Ga). Cretaceous thermal cooling is recorded by detrital zircon fission tracks at Loshui and Lilongshan. Permian fission-track grain ages account for <33% of zircon ages from Loshui, while at Lilongshan, Jurassic/Triassic grain ages account for 33-66% of all zircon fission-track ages. Minor (<12%) Miocene age components are detected in both formations. These new data suggest that the primary sources of these Miocene sediments were similar. A simple model is proposed invoking sediment reworking in this complex tectonic setting.

• 出版日期2010-12