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題 名 | Sequence Stratigraphy of the Middle to Upper Miocene Strata, Northern Taiwan:A Preliminary Study=臺灣北部中上中新統之層序地層學初探 |
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作 者 | 游能悌; | 書刊名 | 中國地質學會會刊 |
卷 期 | 40:4 1997.10[民86.10] |
頁 次 | 頁685-707 |
分類號 | 356.232 |
關鍵詞 | 層序地層學; 海水面變化; 全球海水準; 地層對比; Sequence stratigraphy; Sea-leavel changes; Eustacy; Correlation; |
語 文 | 英文(English) |
中文摘要 | 為了釐清臺灣北部中上中新統的海水面演化,作者選取北部海岸、成福地區河谷 與出磺坑剖面中,連續出露的中上中新統進行層序地層分析。 在這些 " 波浪與潮汐主控的 近海環境 " 的矽質碎屑沈積物中,生物地層雖然不完整,但仍可利用微體化石建立基本的 時間地層架構。 各剖面的沈積層序中,依據沈積相逐漸向上變淺的序列,共辨識出十種約 5-20 公尺厚的次 層序,其海漫面具有強烈的生物擾動,貝殼碎屑與礫質滯積物,或侵蝕面等特徵,這些次層 序顯示小規模的海侵 -- 海退的循環。層序界限可依據,濱面砂岩直接覆蓋於遠濱泥岩或互 層,或向上變淺的潮坪相岩層序列頂部的泥裂、草根或古土壤等特徵加以辨識,這些界限顯 示大規模的海水面變淺事件。 三剖面的沈積層序可依據層序界限劃分為 10、8 與 10 個層序, 並分屬於三種沈積相特性 不同的層序型式。陸棚與海岸層序中的次層序,可以疊加成向上 -- 外伸、後退與外伸堆積 的序列,這些次層序的序列分別屬於低水面、海侵與高水面體系域,並表現出完整且大規模 的海侵 -- 海退循環。而在陸棚 -- 海岸層序中,次層序的疊加型式為向上與外伸堆積,分 別屬於海侵與高水面體系域,表現出不完整的、大規模的海侵 -- 海退循環,其中缺失低水 面體系域。 藉由時間地層架構的控制,各層序在剖面間可一一對比,因此可以確立臺灣北部中上中新統 的層序地層架構,並提供 9 個可對比的地層單位。 此外,藉由層序分析所合成的相對海水 面曲線與全球海水準第三階( 3rd-order )的變化一致, 顯示這些中上中新統的堆積過程 由全球海水準所主控。 |
英文摘要 | In order to better understand the sea-level fluctuations of the middle to upper Miocene strata in northern Taiwan, sequence stratigraphic analysis is applied to three stratigraphic sections, namely the North Coast, Chenfu and Chuhuangkeng. The chronostatigraphic framework of these "wave-and tide-dominated shoreline" siliciclastic strata can be established by integrating the available micropalaeontologic data. In these sections, parasequences can be divided into facies successions of 5-20 m thick. Each parasequence is bounded by marine flooding surfaces which are characterized by intensive bioturbation, shelly lags, or erosion surfaces. Sequence boundaries can be identified by the sharp-based, shoreface sandstones overlying offshore interbeds, and by the top of upward-shoaling facies successions from "subtidal sandstones" to "intertidal interbeds" which are associated with mud cracks, rootlets or paleosols. These features represent the abrupt basinward shifting in facies characteristics and unconformities which display the large-scale falls of relative sealevel. Ten, eight and ten sequences are divided by sequence boundaries in the three studied sections respectively. Three sequence types are recognized by different facies successions. In shelf or coastal sequences, parasequences can be stacked in the aggradationalprogradation, retrogradation and progradation successions which represnet lowstand, transgressive and highstand systems tracts, respectively. A complete, large-scale transgression-regression cycle of relative sea-level is displayed by the sequence boundary and systems tracts in each sequence. However, the parasequences in the coastal sequences, which directly overlie shelf deposits, can only be stacked in the aggradation and progradatin successions which represent transgressive and highstand systems tracts. An incomplete, large-scale transgression-regression cycle of relative sea-level is implied by the missing of lowstand systems tracts. Constrained by the chronstratigraphic framework, the sequences of three sections appear to be mutually consistent. The sequence stratigraphy of the middle to upper Miocene is established and provides a new scheme of nine correlatable units. Furthermore, the derived relative sea-level changes of the studied sections fluctuate with the 3rd-order eustatic curves on the Vail's chart with only two discrepancies around 15.5 and 13.8 Ma. Consequently, it is inferred that sedimentation of the middle to upper Miocene was dominated by eustacy in northern Taiwan. |
本系統中英文摘要資訊取自各篇刊載內容。