Diatom changes in sediments of basins possessing marine/lacustrine transitions in Frosta, Nord-Trøndelag, Norway
Diatom changes in sediments of basins possessing marine/lacustrine transitions in Frosta, Nord-Trøndelag, Norway
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挪威北特伦德拉格郡弗罗斯塔海洋/湖泊过渡盆地沉积物中硅藻的变化
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发表时间：
2008
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通讯作者：
A. Kjemperud
中科院分区：
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作者：
A. Kjemperud
对来自挪威北特罗德拉格弗洛斯塔半岛八个盆地的下层沉积物中的硅藻进行了分析。所有的盆地都与海洋隔绝，并且总是发现从受海水和微咸水影响的植物群到淡水植物群的演替。本文试图为研究区域周围的峡湾盆地建立一个相对盐度范围，从新仙女木期的时臭氧到大西洋时臭氧的末期。这些变化似乎是由冰盖的积累和消融以及全新世早期和中期的主要气候变化控制的。由于各盆地之间的差异很大，因此不可能列出泻湖分类群的一般清单。在没有泻湖类型的情况下，必须在咸淡水菌群的末端建立隔离接触点（海洋/咸淡水边界）。分离后的第一个时期的特点是生产力最高，在硅藻中以嗜碱型为主。在该地区冰川消退后分离出来的最上层盆地中，发现了一枝花属植物群占优势的先锋区系
Diatoms in lower sediments from eight basins of the Frosta peninsula, Nord-Trodelag, Norway, have been analysed. All the basins have been isolated from the sea, and a succession from a flora influenced by marine and brackish water to a freshwater flora is always found. An attempt is made to establish a relative salinity range for the fjord basin around the investigated area, from the Younger Dryas chronozone to the end of the Atlantic chronozone. These changes seem to be controlled by the accumulation and ablation of the ice shield and also by major climatic changes in the early and middle Holocene. It is not possible to make a general list of lagoon taxa, because of great variation from basin to basin. The isolation contact (marine/brackish boundary) must be established at the end of the brackish water flora in the absence of lagoon types. The first period after isolation is characterized by a maximum in productivity with dominance of alkaliphilous types among the diatoms. A pioneer flora with dominance of Fragilaria taxa can be traced in the uppermost basins which were isolated just after the deglaciation of the area