| 台湾始新统—中新统沉积物源与沉积环境 |
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| 引用本文： | 陈淑慧,侯元立,邵磊,黄奇瑜,乔培军,崔宇驰,孟宪博.台湾始新统—中新统沉积物源与沉积环境[J].沉积学报,2020,38(2):319-330. |
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| 作者姓名： | 陈淑慧 侯元立 邵磊 黄奇瑜 乔培军 崔宇驰 孟宪博 |
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| 作者单位： | 同济大学海洋地质国家重点实验室, 上海 200092 |
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| 基金项目： | 国家自然科学基金项目41576059国家自然科学基金项目91528302国家自然科学基金联合基金项目U1505231国家科技重大专项2016ZX05026-004 |
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| 摘 要： | 台湾地区出露的始新统-中新统地层属南海北侧的范畴，其物质组成及沉积环境为揭示南海新生代早期构造沉积演化提供了关键性依据。对台湾西部麓山带中部南投粗坑地区、国姓地区以及东北海岸新港-基隆地区的始新统-中新统地层进行了岩石学、矿物学、稀土元素地球化学特征以及碎屑锆石U-Pb定年分析等研究。结果显示:台湾中部和北部从始新世到中新世经历了从陆相河流-湖泊相沉积环境到滨浅海相的环境转变，其砂岩成分成熟度随时间由老变新呈现规律性变化；沉积物源分析表明研究区沉积物在始新世-早渐新世，物源以近源中生代源区为主，碎屑锆石年龄谱系出现120 Ma和230 Ma两个主要峰值，与周边及华南沿海地区中生代火山岩时代一致；进入晚渐新世以后，锆石年龄谱系出现900 Ma及1 800 Ma等古老峰值，说明古老地块物质明显增加，这可能反映了昆莺琼古河流由南海西部到东部的物质输送对台湾地区的影响作用。
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| 关 键 词： | 台湾 物源 砂岩 锆石 沉积环境 |
| 收稿时间： | 2019-01-11 |
Eocene-Miocene Sediment Source and Environmental Study of Taiwan |
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| Institution: | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China |
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| Abstract: | The exposed Eocene-Miocene strata of Taiwan is within the range of north SCS, whose composition and sedimentary environment revealed the early tectonic and sedimentary development of the Early Cenozoic SCS. This study is based on the Eocene-Miocene strata of the Tsukeng area, central Western Foothills and northeast shoreline of Taiwan and analyzed the petrology, mineralogy, rare earth element geochemistry, and detrital zircon U-Pb age study. Results show that central and northeastern Taiwan experienced transformation from continental facies to marine facies during the Eocene-Miocene, and the sandstone maturity transitioned with time. Source analysis shows that sediment from the Eocene-Lower Oligocene strata was mainly provided by short-distance transported Mesozoic rock, whose zircon age is consistent with the igneous rock in the surrounding and coastal Cathay areas, with 120 Ma and 230 Ma peaks on the age frequency diagram. Since the upper Oligocene, 900 Ma and 1 800 Ma peaks appeared, indicating matter from old blocks started to deposit, which may be the result of the "Kontum-Ying-Qiong" river system transporting the sediment of west SCS to the east and thus influencing Taiwan. |
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