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加拿大阿萨巴斯卡地区泥炭脂类分子记录的古气候信息
投稿时间:2019-12-25  修订日期:2020-02-13  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020060
摘要点击次数: 102
全文下载次数: 43
作者单位E-mail
何大双 中国地质科学院地球物理地球化学勘查研究所 hedashuang@igge.cn 
黄海平 中国地质大学(北京)  
侯读杰 中国地质大学(北京)  
张鹏辉 中国地质科学院地球物理地球化学勘查研究所  
基金项目:中央级公益性科研院所基本科研业务费专项(AS2019Y02)和物化探所中央财政科研项目结余资金项目(JY201705)联合资助
中文摘要:为了进一步了解泥炭中脂类分子化合物的分布与植被演化和气候变化的响应关系,对采自阿尔伯塔省北部阿萨巴斯卡地区的JPH4、Mildred和McMurray泥炭柱样品的脂类分子进行测定。根据正构烷烃、正烷酮、甾萜类等分子化合物的地球化学分析,结合年代学资料,重建了研究区近千年来的古气候演化过程。现代暖期以来(1990年以来),区内大范围的锈色泥炭藓发育,指示温暖干旱的气候条件;现代暖期早期(1900年以来),陆源高等植物和狭叶泥炭藓共存于干-湿交替的气候环境下;JPH4泥炭柱记录了小冰期期间的气候环境,表现为寒冷干旱条件下莎草科等陆生维管植物发育;上述结论与前人记录的区域气候变化具有较好的可比性。研究区发育的锈色泥炭藓种类特殊,多形成于干旱条件下且具有C31正构烷烃优势分布,ACL、Paq、C23/(C27+C31)正构烷烃指标能够有效表征植被输入特征和气候变化。正烷酮主要来源于相应正构烷烃的微生物氧化作用,正烷酮指标CPI-ket、ACL-ket和(K23+K25)/(K27+K29+K31)有效地记录了泥炭沉积时期气候的演变过程。甾、萜类化合物丰度明显高于直链无环类化合物,γ-内酯/生育酚、C29甾酮/C29甾醇、甾醇/甾类化合物等指标能够初步应用于指示区域气候的干湿冷暖变化,微生物的改造作用可能会影响这些指标的分布。
中文关键词:阿萨巴斯卡  泥炭  脂类分子  古植被  古气候
 
Paleoclimatic Information Recorded by Peat Lipid Molecules in the Athabasca Region, Canada
Author NameAffiliationE-mail
hedashuang Institute of Geophysical and Geochemical ExplorationCAGS hedashuang@igge.cn 
Huang Haiping China University of GeosciencesBeijing  
Hou Dujie China University of GeosciencesBeijing  
Zhang Penghui Institute of Geophysical and Geochemical ExplorationCAGS  
Abstract:Lipid molecules of JPH4, Mildred and McMurray peat core samples from Athabasca region of northern Alberta were systematically analyzed in order to further understand the relationship between peat lipid distribution and its response to the vegetation evolution and climate change. In accordance with the analysis results of n-alkanes, n-alkan-2-ones, steroids, terpenoids and other molecular compounds, combined with chronological data, the paleoclimatic evolution in the study area in the past thousand year has been reconstructed. In the modern Recent Warming (since 1990 cal AD), Sphagnum fuscum widely developed in the Athabasca region under warm and dry climate. In the early Recent Warming, terrestrial plants and S. cuspidata species coexisted in the peatland with periods of dry-humid oscillations observed from 1900 to 1990 cal AD. As Little Ice Age period can be dated in the JPH4 core, the climate became cold and dry after 1560 cal AD when C27-dominated vascular plants accumulated in the JPH4 core. These conclusions are consistent with the information documented in local hydrological and paleoclimate data. Sphagnum fuscum, which favors in dry conditions and has C31 n-alkane dominant distribution, is a special plant type of Sphagnum sect. Acutifolia, , ACL, Paq, C23/(C27+C31)n-alkane proxies are optimally selected to interpret paleoclimate alternations recorded by different types of peat-forming plants. In the representative Mildred peat core, microbial oxidation of related n-alkanes is the primary source of n-alkan-2-one that CPI-ket, ACL-ketand (K23+K25)/(K27+K29+K31) n-alkan-2-one are useful proxies to record paleoclimate variations during peat deposition. The abundance of steroids and terpenoids is significantly higher than that of linear-chain acyclic compounds, proxies of γ-lactone/tocopherols, C29 sterone/C29 sterol, sterol/steroids are preliminarily applied to indicate regional dry-wet and cold-warm changes in the study area, microbial alternation may be the factor affecting these proxies.
keywords:Athabasca  peat  lipid molecular  paleovegetation  paleoclimate
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