Sedimentary facies from the modern coral reefs, Jordan Gulf of Aqaba, Red Sea
Sedimentary facies from the modern coral reefs, Jordan Gulf of Aqaba, Red Sea
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约旦亚喀巴湾、红海现代珊瑚礁沉积相
DOI：
10.1007/bf00301693
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发表时间：
1982
期刊：
影响因子：
3.5
通讯作者：
L. Montaggioni
中科院分区：
文献类型：
--
作者：
C. Gabrié;L. Montaggioni
摘要：本文利用对应因子分析法，对从约旦海岸（红海亚喀巴湾）现代边缘珊瑚礁采集的63个沉积物样本进行了分析，以确定其组成和质地的变化。从海岸向海，可以识别出以下地理区域：海滩；浅层后礁带；礁滩带；包括砂质或珊瑚建造的斜坡的前礁地带。根据总组分组成和有孔虫组合可识别出8种沉积相和亚相，利用粒度资料可识别出4种沉积相。分选良好的细砂至中石英砂（陆源相）产于靠近河口的海滩和外砂坡上。后礁区呈现分选相对较好的陆生珊瑚相细砂和千叶珊瑚相细砂。礁滩和珊瑚造礁区的上部以珊瑚-珊瑚线藻和同形藻相的粗砂分选差和粗砂为特征，分别表现为Amphistegina-Spirolina亚相和针状藻亚相。珊瑚软体动物-有孔虫（Amphistegina-Acervulina）相分选差的中等砂局限于前礁带的下部。各种生物相的横向界限与相关生物群落的分布相吻合。
SummarySixty-three sediment samples collected from the modern fringing reefs off the Jordan coast (Gulf of Aqaba, Red Sea) have been analysed in order to determine variations of composition and texture by using correspondence factor analysis. From the shore seawards, the following physiographic zones are recognized: beach; shallower backreef zone; reef flat zone; forereef zone including sandy or coral-built slopes. Eight sediment facies and subfacies can be recognized on the basis of total component composition and foraminiferal assemblages and four sediment facies can be recognized using grain-size data. Wellsorted, fine to medium, quartzofeldspathic sands (terrigenous facies) occur on beaches and outer sandy slopes close to wadi mouths. Backreef areas exhibit relatively well-sorted fine sands of terrigenous-coral and Miliolidae-Soritidae facies. Poorly sorted, coarse sands of coral-coral-line algal and Homotremid facies characterize reef flats and the upper parts of coral-built forereef areas, which respecitively display an Amphistegina-Spirolina subfacies and an Acervulina one. Poorly sorted, medium sands of coralmolluscan-foraminiferal (Amphistegina-Acervulina) facies are restricted to the lower parts of the forereef zone. Latcral limits of the various biofacies coincide with the distribution of the related organic communities.