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引用本文:曾昭琪,钱峰.盘星藻在湖泊沉积中的成矿作用.湖泊科学,2000,12(4):304-310. DOI:10.18307/2000.0403
ZENG Zhaoqi,QIAN Feng.Pediastrum in Lake Sediment and Its Mineralization. J. Lake Sci.2000,12(4):304-310. DOI:10.18307/2000.0403
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盘星藻在湖泊沉积中的成矿作用
曾昭琪1, 钱峰2
1.南京大学生物科学与技术系, 南京210093;2.新加坡大学微生物系, 新加坡0511
摘要:
常被作为淡水湖泊沉积相的指示植物——盘星藻 (Pediastrum spp.)亚化石,在许多国家均有发现.我国新生代油田的岩芯中亦有较多的盘星藻化石的记载 (包括江苏、湖北、河北、西北和东北等地).本文报告了盘星藻在湖泊中沉积成矿的探索性研究,证明盘星藻等浮游藻类在成矿或成油的过程中有一定的贡献.
关键词:  盘星藻  藻类  绿藻  成矿生物
DOI:10.18307/2000.0403
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Pediastrum in Lake Sediment and Its Mineralization
ZENG Zhaoqi1, QIAN Feng2
1.Departmentof Biological Science and Technology, Nanjing University, Nanjing 210093, P.R. China;2.Departmentof Microbiology, National University of Singapore, Republic of Singapore 0511
Abstract:
A lotof algae fossilswere found in Cenozoic lake sediments especiallyPediastrum fossil sed-imentar'y deposits in some places of China and also in some nearby seacoasts. For imitating Pedi-astrum mine ralization in lake sediments several species ofPediastrum are cultured using BBM medium and sea water with 18% salt. By optical and electronic microscope observation and photo-syntheic pigment analysis we found thatPediastrum boryanum,P. duplex var'clathratum andP.tetras etc. cannot grow well in sea water. If cultured in saline medium the specimen will die in a short period of time. We consider that probably thePediastrum fossil that appeared in marine sediments were transported to the sea by river. In order to prove the mineralization condition of in living organism and fossils ofPediastrum, the following analy sis is made. The fat-soluble substances are high and they contain a small amountof alkane alkene fatty acid and a great deal of plant pigments.Pediastrum has high H/C and low 0/C (atom number ratio) value. Therefore,it is agood resource of oilformation. The products of oxidative degradation of the insoluble cell-wall ofPediastrum are similar to the production obtained by kerogen, which is known to be of algalorigin. So the insolable materials of cell-wall are probably a source of kerogen during the deposition.
Key words:  Pediastrum  algae  green algae  Bio-mineralization
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