Using pollen in turbidites for vegetation reconstructions

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL Journal of Quaternary Science Pub Date : 2024-09-19 DOI:10.1002/jqs.3653
Laura S. McDonald, Lorna J. Strachan, Katherine Holt, Adam D. McArthur, Philip M. Barnes, Katherine L. Maier, Alan R. Orpin, Mark Horrocks, Aratrika Ganguly, Jenni L. Hopkins, Helen C. Bostock
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Abstract

Turbidites, deposited by sub-aqueous gravity flows, are common in sedimentary archives worldwide and present a unique challenge and opportunity when reconstructing past vegetation through pollen analysis. When sampling pollen from a sediment core for palaeovegetation records, it is common practice to target background sediments (i.e. pelagic sediment) and avoid sampling turbidites, as they are presumed to portray a misleading picture of past vegetation. This assumption stems from our limited understanding of pollen abundance and distribution through turbidites, meaning that palynologists overlook deposits that could potentially be used to reconstruct past vegetation and climate. We present pollen assemblage and sedimentological data from four recent (<150 years) deep marine turbidite deposits from the Hikurangi Subduction Margin, Aotearoa-New Zealand, with the aim of understanding the abundance and distribution of pollen in fine-grained turbidites. We find that pollen is diluted in the bases of turbidites, but despite this dilution, the proportions of different pollen taxa remain consistent through each turbidite. These results confirm that pollen can be sampled from turbidites for palaeovegetation reconstructions and that sampling the fine-grained upper parts of turbidites will provide the best pollen recovery.

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利用浊积岩中的花粉进行植被重建
浊积岩是由水下重力流沉积而成的,在世界各地的沉积档案中都很常见,在通过花粉分析重建过去植被时,浊积岩是一个独特的挑战和机遇。从沉积岩芯中采集花粉以获取古植被记录时,通常的做法是以背景沉积物(即浮游沉积物)为目标,避免采集浊积岩样本,因为浊积岩被认为会误导对过去植被的描述。这种假设源于我们对浊积岩中花粉丰度和分布的有限了解,这意味着古生物学家忽略了可能用于重建过去植被和气候的沉积物。我们展示了新西兰奥特亚罗瓦 Hikurangi 俯冲边缘四个近期(150 年)深海浊积岩沉积的花粉组合和沉积学数据,旨在了解花粉在细粒浊积岩中的丰度和分布。我们发现,花粉在浊积岩底部被稀释,但尽管如此,不同花粉类群在每个浊积岩中的比例仍然保持一致。这些结果证实,可以从浊积岩中提取花粉用于古植被重建,而且在浊积岩的细粒上部取样可以获得最佳的花粉恢复效果。
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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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