| 摘要: |
| 1987年以来中国科学院海洋研究所多次对黄、东海陆架进行了调查，利用薄片分析、数理统计、化学分析及古生物鉴定等多种方法，分别对所采获的砂岩砾石的结构、组成等作了研究。结果表明这些砂岩砾石不但分布广泛、数量丰富，而且大小不一，从＜1cm到最大60cm不等，形态细长、扁平，成因类型属于风成石类。此外，砾石中普遍含有海绿石及海相有孔虫、介形虫等．证明黄、东海陆架上大面积出露以砂岩砾石为代表的第三系海相地层，经过长期复杂的风化作用后，其破碎产物成为海底沉积物的重要来源。 |
| 关键词: 黄东海陆架 第三系 砂岩 砾石 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金!49376263 |
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| GEOLOGICAL SIGNIFICANCE OF SANDSTONE GRAVEL FROM THE SHELVES OF THE YELLOW SEA AND EAST CHINA SEA |
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Shen Shunxi, Chen Lirong, Li Anchun, Yuan Wei
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Institute of Oceanology, Academia Sinica, Qingdao 266071
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| Abstract: |
| Sandstone gravel is abundant and extensively distributes in the Yellow Sea and East China Sea as shown by their presence at 300 stations. Three hundred kilograms’ gravel were sampled once at Station C933 with a drag net in June of 1989. Two hundred kilograms’ gravel were collected once at Station C204 with the same method. The graver’s structure, mineral and chemical compositions and seismic profiles, have been extensively studied. Data confirm that Tertiary system marine facies stratum (mainly sandstone) is exposed on the floor extensively. It seems possible that the bottom sediments are mainly derived from it. The sandstone and shale contain a large number of Tertiary mollusc fossils. Sandstone gravel and sandy limestone gravel are rich in CaO but poor in SiO2, and mainly are calcareous feldspar quartz sandstone and calcareous sandstone, and to a lesser degree are silty limestone and siltpelite, etc. The composition and characteristics of the sandstone are similar to those of the sediment on the nearby ocean floor except for higher quartz content but lower calcite content, which presumably reflect a long weathering process of the sandstones. Consequently, they become an important source of the sediments of the Yellow Sea and East china Sea shelves. |
| Key words: Yellow Sea and East China Sea Shelves, Tertiary system, Sandstone, Gravel |
