| 不同水域鲤鱼耳石CaCO3晶体结构特征与环境响应初探 |
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| 关键词:otolith X-ray diffraction crystal structure water environment typomorphic characteristic of mineral Baiyangdian shallow lake Miyun reservoir |
| 基金项目:国家自然科学基金项目(编号:40473044); 科技部国家科技基础条件平台项目(编号:2005DKA21405) |
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| A Tentative Discussion on the CaCO3 Crystal Structures of Otoliths and the Environment Response in Different Water Areas |
| Otolith of fish is made of CaCO_3,and its crystal form is aragonite or vaterite.In the past forty or fifty years,quite a few achievements have been made in the study of the CaCO3 crystal structures in the otoliths,but no advances in the researches on therelationships between the features of the crystal structures of the fish otoliths and their living environments have been reported in literature.In this paper,the characteristics of crystal structures of CaCO3 in otoliths of carps from two areas with extremely different water environments,i.e.,the seriously polluted Baiyangdian shallow lake and the Miyun reservoir,were studied by means of X-ray diffraction analysis,and the basic cells and dimensions were analyzed.The experimental results indicate that all samples from the two sites are composed of vaterites,which can be divided into three different crystal structures,namely,two types of hexagonal cells with space group P63/mmc and one type of orthorhombic cell with space group Pbnm.For the vaterites with the hexagonal cell,the dimensions of samples from the Miyun reservoir are much nearer to the standards than those from the Baiyangdian shallow lake,and a0 of the former is relatively bigger than the latter,but things are opposite for c0.Moreover,the cell volume of vaterite from the Miyun reservoir is bigger than that from the Baiyangdian shallow lake,and the former is nearer to the standards than the latter.There exist no distinct results for the vaterites with the orthorhombic cell.The results of microchemical characteristic composition analysis show that the differences in the dimensions of basic cells of vaterites from the two localities are consistent with those in the microchemical characteristic compositions of vaterites from these localities.Therefore,the information of the crystal structure of vaterite in otolith of carp seems sensitive to water quality and water environment,and this can be regarded as an important indicator to the pollution degree of the water. |
| YANG Liang-feng,LI Sheng-rong,WANG Yue-wen,LUO Jun-yan,GAO Yong-hua,DONG Jing-gui,CAO Hua,SHEN Jun-feng.2007.A Tentative Discussion on the CaCO3 Crystal Structures of Otoliths and the Environment Response in Different Water Areas[J].Acta Geoscientica Sinica,28(2):195-204. |
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