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首页> 外文期刊>Journal of South American earth sciences >Holocene paleoenvironmental reconstruction in the Eastern Amazonian Basin: Comprido Lake
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Holocene paleoenvironmental reconstruction in the Eastern Amazonian Basin: Comprido Lake

机译：东亚马逊河流域全新世古环境重建：Comprido湖

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摘要

Two sediment cores were studied from Comprido Lake, a black water floodplain lake located near Monte Alegre City, Eastern Amazonian Basin. The total organic carbon (TOC), nitrogen content (TN), δ~(13)Oroc. sedimentary chlorophyll, diatom record and mineralogical composition revealed different hydrological and climatic regimes during the Holocene. Between 10,300 and 7800 cal yr BP, a dry climate was suggested by low values of TOC and chlorophyll derivatives concentrations that are related to the development of a C_4 grasses on unflooded mud banks. A gap in sedimentation due to a complete dryness of the lake occurred between 7800 and 3000 cal years BP corresponding to the Middle Holocene dry phase. From 3000 cal years BP onwards a gradual increase of the TOC, chlorophyll derivatives and Aulacoseira sp. suggest an increase in the productivity and in water lake level due to the high water flow of the Amazon River and the catchment area as well. The Comprido Lake record indicates that the Late Holocene in this region was characterized by a wetter climate, as also observed in other records of the Amazonian Basin.
机译：研究人员从位于东部亚马逊河盆地蒙特阿雷格里市附近的黑水泛滥湖Comprido湖研究了两个沉积物岩心。总有机碳（TOC），氮含量（TN），δ〜（13）Oroc。全新世期间的沉积叶绿素，硅藻记录和矿物学组成揭示了不同的水文和气候状况。在10300到7800 cal BP之间，TOC和叶绿素衍生物的浓度较低，这表明干旱的气候与未淹没泥滩上C_4草的发育有关。由于湖泊完全干燥导致的沉积间隙出现在7800至3000 cal年BP之间，对应于中全新世干相。从3,000 cal BP开始，TOC，叶绿素衍生物和Aulacoseira sp。逐渐增加。由于亚马孙河和集水区的高水流量，表明生产力和水湖水位的增加。 Comprido湖的记录表明，该地区的晚全新世以潮湿的气候为特征，在亚马逊河流域的其他记录中也观察到。

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