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首页> 外文期刊>Marine Geology >Foraminiferal evidence for Holocene environmental transitions in the Yaojiang Valley, south Hangzhou Bay, eastern China, and its significance for Neolithic occupations
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Foraminiferal evidence for Holocene environmental transitions in the Yaojiang Valley, south Hangzhou Bay, eastern China, and its significance for Neolithic occupations

机译：姚江谷，杭州湾，东部南部山谷的全新世环境过渡的对aminifaric证据及其对新石器时代职业的重要性

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摘要

The transition from a marine-influenced environment to a coastal plain setting during the Early to Middle Holocene was crucial for early human occupation along the eastern China coast. Here, detailed foraminiferal analyses were completed for two sediment cores (YJ1505 and YJ1508) retrieved from the Yaojiang Valley (YJV) along the southern Hangzhou Bay coast of eastern China. Brief environmental changes in the YJV during the Early-Middle Holocene were recovered on the basis of radiocarbon chronology. The assemblages and Detrended Correspondence Analysis (DCA) results of the foraminifera of both cores indicated that the YJV was evidently under a marine influence from 9200 to 7900?cal?yr BP; prior to that, it was a fluvial incised valley. The increasing trends in shallow marine foraminifera and the planktonic/benthic foraminifera (P/B) ratio showed that a transgressive period possibly occurred in the valleyca.9200–7900?cal?yr BP, and their following decreases suggested that a rapid regression process occurred thereafter. The disappearance of foraminifera and formation of a peaty layer in core YJ1505ca.7600–6500?cal?yr BP implied a brief environmental transition to a limnetic wetland setting in the valley centre, which would have been attractive to early human settlers. The disappearance of foraminifera in core YJ1508 at the valley's eastern entrance suggested that most areas of the valley were located far from marine influence afterca.6250?cal?yr BP. Then, the limnetic wetland setting transitioned into a coastal plain environment, attracting more people to the valley. Such a transition in the YJV would have provided more opportunities for ancient people and possibly catalysed the development of the Hemudu culture (HC) for approximately two millennia.
机译：从海洋影响的环境过渡到沿海全新世期间到沿海普通环境对中国东部海岸的早期人类占领至关重要。在这里，从杭州东部南部海岸南部的姚江谷（YJV）检索的两个沉积物核（YJ1505和YJ1508）完成了详细的多氨基氨基分析。在早期的全新生期间，YJV的短暂环境变化在RadioCarbon年代学的基础上被恢复。两种核心的花瓶的组合和衰减对应分析（DCA）结果表明，YJV显然在9200至7900℃的海洋影响下是明显的？在此之前，它是一种河流切开谷。浅海洋传染料和浮游/底栖火鸡（P / B）比率的增加趋势表明，可能发生在Valleyca.9200-7900？CAL？YR BP中的近灾期，并且其以下减少表明发生了快速的回归过程此后。 Foraminifera的消失和核心YJ1505CA.7600-6500中的泥质层的形成？YR BP暗示了对谷中心的紫色湿地环境的简要环境过渡，这对早期人类定居者来说是有吸引力的。在山谷东部入口处的Foraminifera在核心YJ1508中的消失表明，山谷的大多数地区都位于海洋影响越野中.6250？CAL？YR BP。然后，紫色湿地的环境过渡到沿海平原环境中，吸引了更多的人到山谷。在YJV中的这种过渡将为古代人提供更多机会，并且可能催化了大约两千年的Hemudu文化（HC）的发展。

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