Holocene reef associated carbonate sediments and their Pleistocene counterparts, Miyako Islands, Ryukyus, southwest of Japan
Holocene reef associated carbonate sediments and their Pleistocene counterparts, Miyako Islands, Ryukyus, southwest of Japan
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日本西南部琉球群岛宫古群岛全新世珊瑚礁相关碳酸盐沉积物及其更新世对应物
DOI：
10.1306/703c8b69-1707-11d7-8645000102c1865d
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
H. Sunouchi
中科院分区：
文献类型：
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作者：
Y. Tsuji;T. Yamamura;T. Kodato;H. Sunouchi
通过对日本西南部琉球岛宫古岛附近全新世碳酸盐沉积相的调查，明确了从海平面到陆架斜坡约1000m深度的碳酸盐沉积相分布及其与沉积的关系。利用声波资料、样品分析资料和海底照片识别出六种相。它们如下：(A)礁相：主要由原生珊瑚和结壳藻类组成，深度0-60米。(B)礁间泥质相：由极细砂粒大小的碳酸盐岩碎屑和线状泥组成，周围20-60米深，为礁起伏和岛屿。(C)礁间和礁附近砂相：以0-90米深的浅底栖有孔虫Calcarina和Margiopora以及Halimeda碎片为特征。(D)红柱石和大型有孔虫砾质陆架相：包含卵石至鹅卵石大小的红柱岩和/和圆柱虫和有孔虫，深60-200米。(E)苔藓虫砂质陆架相：富含附生动物碎片，深度80-200米。(F)陆架坡远洋有孔虫相：以远洋有孔虫和翼足类软体动物测试为主，深度在200m以下。在露头和岩心样品中已发现与更新世出现的灰岩序列对应的陆架坡有孔虫相。对全新世沉积物的海洋调查结果使其更容易解释更新世的沉积环境和海平面变化。
Holocene carbonate sedimentary facies distribution, from sea level to shelf slope about 1,000 m in depth, and its relationship to bathymeltry, off Miyako Island, Ryukyus, southwest of Japan were clarified by surveys with sidescan sonar, sparker, uniboom, sea-bottom camera, and sediment sampler. Six facies were recognized using the acoustic data, sample analytical data, and sea-bottom photographs. These are as follows: (A) Reef facies: made mainly of autochthonous hermatypic corals and encrusting algae, 0-60 m deep. (B) Inter-reef muddy facies: consists of very fine sand-size carbonate fraction and line mud, 20-60 m deep surrounded area be reefal relief and islands. (C) Inter-reef and near-reef sandy facies: characterized by tests of shallow benthic foraminifera Calcarina and Marginopora, and Halimeda fragments, 0-90 m deep. (D) Rhodolith and large foraminiferal gravelly shelf facies: contains pebble to cobble-size rhodolith and/and foraminifera Cycloclypeus and Operculina, 60-200 m deep. (E) Bryozoan sandy shelf facies: rich in byrozoan fragments, 80-200 m deep. (F) Shelf slope pelagic foraminiferal facies: dominated by pelagic foraminifera and pteropod molluscan tests, deeper than 200 m. Counterparts of these facies in emerged Pleistocene limestone sequences have been recognized in outcrops and core samples. The results of the marine survey on Holocene deposits made itmore » easy to interpret the Pleistocene depositional environments and sea level changes.« less