阿巴拉契亚北部从冰期消退到全新世早期:加拿大quacimbec Scotstown沼泽的多代古环境记录

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Leeli Amon, Jeannine-Marie St-Jacques, Ekaterina Ershova, Kathryn E. Hargan, Charlotte Mary Cotter Whyte, Dirk Sachse, Oliver Rach, Matthew C. Peros
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引用次数: 0

摘要

一项对qusamubec泥炭沼沉积物序列的多代理研究表明,从劳伦泰德冰盖的冰川消退到全新世早期,环境对气候条件变化的快速而显著的响应。Scotstown Bog(北纬45°30′45.0”,西经71°11′42.0”)是位于加拿大魁省南部阿巴拉契亚高地边缘的一个共生泥炭地。利用古植物学(植物大化石、大木炭、花粉分析)、动物学(手摇虫分析)、沉积学(粒度分析、沉积物有机质含量)和地球化学(沉积正构烷烃和氢同位素分析)等方法,重建了14000 - 6000cal a bp的晚冰期和全新世早期古环境。我们针对晚冰期进行了多代理重建,这为生物群如何响应气候和环境条件的深刻变化提供了一个例子。所有古生态代用物均记录了13000 ~ 12900 cal A bp之间的重大转变。我们的重建揭示了当时两大环境变化。首先,从沉积学变化、沉积物粒度和chironomid组合变化来看,Scotstown盆地从一个更大的前冰湖中分离出来。其次,植物大化石和花粉流显示了同期植被组成从冻土带到林木线再到封闭林冠森林群落的重大转变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
From deglaciation to the Early Holocene in the northern Appalachians: A multiproxy palaeoenvironmental record from Scotstown Bog, Québec, Canada

A multiproxy study of a sediment sequence from a Québec peatbog characterises the rapid and significant environmental responses to changing climatic conditions from the deglaciation of the Laurentide Ice Sheet to the early Holocene period. Scotstown Bog (45°30'45.0“N, 71°11'42.0“W) is an ombrotrophic peatland on the edge of the Appalachian Uplands in southern Québec, Canada. We reconstructed its Late-glacial and early Holocene palaeoenvironments for 14 000–6 000 cal a bp using palaeobotanical (plant macrofossil, macrocharcoal, pollen analyses), faunal (chironomid analysis), sedimentological (grain-size analysis, sediment organic content), and geochemical (sedimentary n-alkanes and hydrogen isotope analyses) methods. We targeted our multiproxy reconstruction on the Late-glacial period, which provides an example of how biota can respond to profound changes in climatic and environmental conditions. A major transition occurred between 13 000 and 12 900 cal a  bp, which is recorded in all palaeoecological proxies. Our reconstruction reveals two major environmental changes at this time. First, the Scotstown basin became isolated from a larger proglacial lake, as shown by sedimentological changes, sediment grain size and chironomid assemblage shift. Second, plant macrofossils and pollen influx show contemporaneous major shifts in the vegetation composition from tundra to tree-line to closed-canopy forested communities.

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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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