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首页> 外文期刊>Journal of quaternary science: JQS >A late Pleistocene-Holocene multi-proxy record of palaeoenvironmental change from Still Bay, southern Cape Coast, South Africa
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A late Pleistocene-Holocene multi-proxy record of palaeoenvironmental change from Still Bay, southern Cape Coast, South Africa

机译：来自南非开普敦南部斯蒂尔湾的晚更新世-全新世多代记录的古环境变化

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摘要

The southern Cape is a key focus for southern African palaeoenvironmental research as it represents the transitional region between temperate westerlies and sub-tropical rainfall sources. This study presents pollen, plant biomarker, geochemical and charcoal data preserved in the Rietvlei wetland. The bulk of the record spans the last 16 ka, but it also provides rare insights into late Marine Oxygen Isotope Stage (MIS) 3 (ca. 35-30k cal a BP). The data suggest that during the Pleistocene the development and permanence of this wetland was probably influenced by sea-level change via control on the local water table; notably lower sea levels within MIS 2 resulted in very limited wetland productivity. The MIS 3 section provides evidence both supporting previous suggestions of relatively humid conditions, but also some indication of periodic arid phases. The Holocene record suggests clear contrasts between the early (11-7k cal a BP; relatively humid), mid-Holocene (7-3.3k cal a BP; more arid, less productive wetland conditions) and latest Holocene (last 2k cal a BP; resurgence in both fynbos and aquatic/riparian pollen). While isolating the roles of winter/summer rainfall remains challenging, these data clarify the nature of change during key episodes in the regional palaeoenvironmental record. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：南开普省是南部非洲古环境研究的重点，因为它代表了温带西风和亚热带降雨源之间的过渡地区。这项研究提供了Rietvlei湿地中保存的花粉，植物生物标志物，地球化学和木炭数据。记录的大部分时间跨度为最后16 ka，但它也提供了有关后期海洋氧同位素阶段（MIS）3（约35-30k cal BP）的罕见见解。数据表明，在更新世期间，该湿地的发展和持久性很可能受到当地水位控制下海平面变化的影响。 MIS 2中的海平面明显降低，导致湿地生产力非常有限。 MIS 3部分提供了既支持相对潮湿条件的先前建议的证据，又提供了周期性干旱阶段的指示。全新世记录表明，早期（11-7k cal BP;相对潮湿），中全新世（7-3.3k cal a BP;更干旱，生产力较低的湿地条件）和最新的全新世（最后2k cal BP）之间存在明显的对比。 ; fynbos和水生/河岸花粉中的回潮）。隔离冬/夏季降雨的作用仍然具有挑战性，但这些数据阐明了区域古环境记录中关键事件期间变化的性质。版权所有（c）2015 John Wiley＆Sons，Ltd.

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