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題 名 | 關渡一號井的有孔蟲化石及其古環境初探=A Preliminary Study of the Foraminifer Assemblages in the KT-1 Observation Well in the Taipei Basin and Their Paleoenvironmental Implications |
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作 者 | 謝英宗; | 書刊名 | 經濟部中央地質調查所彙刊 |
卷 期 | 14 2001.09[民90.09] |
頁 次 | 頁83-102 |
分類號 | 359.5 |
關鍵詞 | 有孔蟲化石; 關渡一號井; 臺北盆地; Foraminifera; Kuantu observation well; Taipei basin; |
語 文 | 中文(Chinese) |
中文摘要 | 關渡一號井(KT-1)位在臺北盆地西北隅的關渡自然公園內,該鑽井深度達520公尺,在井下499.25公尺處鑽遇基盤,基盤岩為五指山層。本研究共採集並分析該鑽井163個泥質沉積物標本,分析結果顯示有孔蟲化石多集中在松山層中,其中以鑽井深度29.7到51.5公尺處最多。對比蘆洲、五股、民權公園和松山菸廠等鑽井的研究結果,顯示此時期可能就是松山層最大海侵期。松山層上段有孔蟲化石雖然是以底棲性有孔蟲的數量較多,但亦含浮游性有孔蟲化石;反之,松山層下段和新莊層則以浮游性有孔蟲化石為主,底棲性有孔蟲化石的數量相當稀少。其有孔蟲化石在岩心標本中含量的變化,可能暗示松山層下段和新莊層沉積時期,關渡鑽井附近是以淡水相環境為主,偶有海水入侵,松山層上段的堆積環境則可能以海相至半淡水相為主。 關渡一號井的有孔蟲化石族群仍然以底棲性有孔蟲為主,共可發現64種的底棲性有孔蟲化石和22種浮游性有孔蟲化石,其中底棲性有孔蟲化石的數量約佔全群的57.2%,浮游性有孔蟲化石的數量則約佔42.8%。底棲性有孔蟲化石中以Cavarotalia annectens的數量最多,其次依序為Elphidium、Discopulvinulina和Ammonia,約佔底棲性有孔蟲化石全群數量的59.2%,這些底棲性有孔蟲化石族群,指示為一個典型的濱岸河口,是海水和淡水混合的河口海灣。浮游性有孔蟲化石種屬中,以Neogloboquadrina dutertrei的含量最多,其次依序為Globigerinoides ruber、Globigerinoides immaturus、Globigerinita glutinata、Globigerina bulloides和Neogloboquadrina imcompta,上述六種浮游性有孔蟲化石的數量約佔浮游性有孔蟲化石全群的71.5%。有孔蟲化石族群的組合顯示關渡鑽井附近區域在全新世松山期海侵時,雖然仍有低鹽度濱岸河口的特徵,但相較於臺北盆地東側鑽井的有孔蟲化石族群組合,已接近(或類似)開闊性近海的海洋環境。另由浮游性有孔蟲Globorotalia spp.和Pulleniatina obliquiloculata的出現,可能暗示松山層下段和新莊層沉積時,關渡附近地區受海水影響的程度遠比臺北盆地其他區域來得強,值得更深入的探討。 |
英文摘要 | As one part of the integrated research project on the subsurface geology and engineering environment of the Taipei basin, foraminifer assemblages in the 520-meter long sediment succession recovered from the Kuantu-1 (KT-1) observation well in the northern part of the Taipei basin have been studied. Benthic and planktonic foraminifera are plentiful in the Upper Sungshan Formation, indicative of a pelagic to brackish water environment. Enrichment of the foraminifera is observed between 29.7 and 51.5 m. Correlations with other observation cores demonstrate that this interval was deposited during the maximum Sungshan transgression. The assemblages of the Lower Ssungshan Formation and the Hsingchuang Formation chiefly contain planktonic and very rare benthic foraminifera, which suggests a mainly semi-freshwater environment. A total of 64 benthic foraminifera and 22 planktonic foraminifera species were identified in the KT-1 well. Benthic foraminifera comprise form constitute 57.2% of the whole foraminifer assemblage. Where the diversity is so great that it shows a very different environment from that found in any other observation well in the eastern part of the basin. The four most abundant benthic foraminifera species in the KT-1 core are Cavarotoloia annectens, Elphidium spp., Discopulvinulina spp. and Ammonia spp. and they amount to 59.2% of the benthic foraminifer assemblage. This assemblage indicates a low saline, estuary environment. The planktonic foraminifer assemblages in KT-1 are dominated by Neogloboquqdrina dutertrei, Globigerinoides rubber, Globigerinoides immaturus, Globigerinita glutinata, Globigerina bulloides and neogloboquadrina imcompta, which constitute 71.5% of it. Such an assemblage is typical of warm, subtropical, offshore environments. The occurrences of Globorotalia spp. and Pulleniatina obliquiloculata suggest that the Kuantu area may be influenced stronger by sea water during the deposition of the Lower Sungshan and Hsingchuang Formations that the deposit of other Formations of the Taipei basin. |
本系統中英文摘要資訊取自各篇刊載內容。