https://scholars.lib.ntu.edu.tw/handle/123456789/45093
標題: | 臺灣珊瑚礁保育研究─子計畫六:沈積物對珊瑚群聚結構和珊瑚生長形態的影響(I) | 作者: | 戴昌鳳 | 關鍵字: | 沈積物;珊瑚礁;珊瑚礁發育;冷泉滲流岩;sedimentation;coral reef;reef development;cold-seep carbonates | 公開日期: | 2000 | 出版社: | 臺北市:國立臺灣大學海洋研究所 | 摘要: | 臺灣西南地區的更新世珊瑚礁是 在地形高區上發育形成的,這些化石 珊瑚礁的基底岩層均屬於沉積物高的 環境。為了瞭解珊瑚礁如何在高沉積 物的環境中發育形成,以及沉積物對 珊瑚群聚和珊瑚生長形態的長期影 響,我們調查大崗山、小崗山、半屏 山及壽山的珊瑚礁結構,並且分析其 生物和沉積物的組成。野外化石產狀 顯示,以花月蛤為主的生物群聚,可 能是改變底質的先驅生物;泥質石灰 岩的特殊產狀與其所含的貝類化石組 成顯示其可能是冷泉滲流碳酸鹽;根 據Hayasaka (1932) 對甲仙與壽山化石 與岩石產狀的比較和描述,該區的石 灰岩極可能與在大崗山相同。整體的 證據顯示臺灣西南部的珊瑚礁在從地 形高區形成到有珊瑚礁發育之前,可 能都有冷泉滲流碳酸鹽岩的形成;冷 泉滲流導致早期的成岩作用,並且使 得鬆軟底質逐漸改變為堅硬底質,而 有利於生物礁的發育。 The Pleistocene coral reefs in SW Taiwan developed on several structural highs. It is uncertain that how these coral reefs built up in a noncarbonate environment that dominated by finegrained siliciclastics. Based on studies of the outcrops and 21 drilling cores, we recognized cold-seep carbonates from those outcrops of E Takangshan and SE Hsiaokangshan. The upper parts of cold-seep carbonates of the former consist of encrusting coralline algae and scleractinian corals, then overlaid by bioclastic limestone. Besides, we also found lithified calcareous mudstone pebbles and cobbles near or at the tops of “soft” Gutingkeng mudstone in 5 and 2 boreholes of Takangshan and Panpingshan respectively. The same phenomenon occurred at the outcrop of SE Hsiaokangshan. It seems that those 2 pebbles and cobbles derived from other cold-seep carbonates. As yet we did not see any cold-seep carbonates at the outcrops of Shoushan. According to the detailed descriptions by Hayasaka (1932), the limestones of Shoushan and Chiahsien that contain abundant Loripes bivalves is likely the so-called “coldseep carbonates." Based on these findings, we propose that there were some cold-seep carbonates developed during the shallowing of structural highs in SW Taiwan and these carbonates served as the consolidated substrates for the development of coral reefs in a noncarbonate environment. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/14790 | 其他識別: | 892621Z002022 | Rights: | 國立臺灣大學海洋研究所 |
顯示於: | 海洋研究所 |
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