| 利用贝类(Lamprotula)化石碳氧同位素再建山西丁村地区晚更新世气候环境 |
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| 引用本文： | 李玉成,黄宝玉,徐永昌.利用贝类(Lamprotula)化石碳氧同位素再建山西丁村地区晚更新世气候环境[J].沉积学报,2001,19(4):648-651. |
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| 作者姓名： | 李玉成 黄宝玉 徐永昌 |
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| 作者单位： | 1.安徽大学生物资源与环境系环境科学研究所 合肥 230039; |
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| 摘 要： | 较大的湖泊中的贝类生长线的氧同位素可能记录了季节性的温度变化。对拔氏丽蚌 (楔丽蚌 )Lamprotula(Cuneolamprotula)bazini (Heude)和环带丽蚌 (丽蚌 )Lamprotula (Lamprotula)zonata (Heude)的生长线进行氧同位素研究表明,前者有较强的适应环境变化的能力。δ18O值记录的襄汾地区晚更新世的古温度为 2 0～ 2 4℃至 30～34℃,古降雨量多出现代 2 0 0～ 2 6 7mm,河水排泄不畅,积水成湖。这些结果给人的启示是:全球变暖后,该地区气温可能有较大升幅 ;降雨量的增加有可能在排水不畅地区形成水灾,应注意防患于未然。
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| 关 键 词： | 山西襄汾地区 氧同位素 古气候环境 晚更新世 |
| 文章编号： | 1000-0550(2001)04-0648-04 |
| 收稿时间： | 2001-11-22 |
| 修稿时间： | 2000年11月22日 |
Palaeoclimatic and Palaeoenvironmental Information Using Stable Isotope Profil es from the Late Pleistocene Lamprotula in Dingcun Area Shanxi |
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| LI Yu cheng,HUANG Bao yu,XU Yong chang.Palaeoclimatic and Palaeoenvironmental Information Using Stable Isotope Profil es from the Late Pleistocene Lamprotula in Dingcun Area Shanxi[J].Acta Sedimentologica Sinica,2001,19(4):648-651. |
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| Authors: | LI Yu cheng HUANG Bao yu XU Yong chang |
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| Institution: | 1.Department of Biological Resources and Environment Sciences, Anhui University,Hefei 230039;2.Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008;3.Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | The paiaeociimatic and paiaeoenvironmentai information is studied by using the carbon and oxygen isotope profiies from the Late Pieistocene Lamprotula in Linfen and Xiangfe areas, where occur aboundant iameiiibranchs, especiaiiy fossii Lamprotula. The conciusions are as foiiows:1. The cessation of Lamprotula（Cuneolamprotula）bazini（Heude）sheii deposition in faii and summer is rich in16O, withδ 18O vaiue of - 14.5‰, whiie one in winter and spring is rich in18O, with δ 18O vaiue of - 12.2‰, and this fiuctuationof 2.2‰ may indicate a magnitute of change in seasonai temperature of water up to 10℃.2. The paiaeoenviroment of fossii Lamprotula was simiiar to ecoiogy of iiving Lamprotula in iower reaches of the Yangtze river, thus the most suitabie water for the Late Pieistocene Lamprotula was at temperature of 25 ~ 29℃ with a pH vaiue of 7 ~ 8. Therefore, the seasonai temperature of water changes from 20 ~ 24℃ to 30 ~ 34℃. 3. The sheii mean oxygen isotope vaiues of Lamprotula（Cuneolamprotula）bazini（Heude）and Lamprotula（ Lamprotula） zonata（Heude）are - 12.9‰ and - 12.6 ‰, respectiveiy. This sheiiδ18O vaiues can be converted to waterδ18O vaiues by the iinear eguationδ 18Op（ SM0W）= 1.07δ 18O s - 0.58, and, therefore, δ 18O vaiues of water where their iived is about - 14.4‰~ - 14.1‰. These vaiues are approximateiy 4‰ iighter than the meanδ 18O vaiue of the present rainfaii（ - 10‰）. It suggests that the annuai mean precipitation on Xiangfe Lake during the Late Pieistocene exceeded that of the pvesent by 200 ~ 267 mm. |
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| Keywords: | freshwater Mollusca shell axygen isotope profile Late pleitsaene palaeoclimatic information |
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