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首页> 外文期刊>Cretaceous Research >Palynological and palynofacies analyses of Upper Cretaceous deposits in the Hateg Basin, southern Carpathians, Romania
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Palynological and palynofacies analyses of Upper Cretaceous deposits in the Hateg Basin, southern Carpathians, Romania

机译：罗马尼亚南喀尔巴阡山脉盆地上白垩纪沉积物的腭痛 - 山脉沉积物分析

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摘要

We present biostratigraphical and palaeoenvironmental analyses based on palynology and palynofacies of marine and terrestrial deposits that crop out in the central and northwestern part of the Hafeg Basin. Samples were collected from the Rachitova and Sinpetru formations. The former yielded well-preserved palynological assemblages of both terrestrial and marine origin, represented mainly by diverse spore and pollen associations, but with dinoflagellate assemblages of low diversity and low to moderate abundance. The terrestrial palynoflora is dominated by fern spores and subordinate gymnosperm and angiosperm pollen. This assemblage is indicative of a vegetation of subtropical to warm-temperate climate and suggests fluvial to coastal habitats, as well as well-drained and higher altitude areas. The Rachitova Formation is here dated as Santonian-early late Campanian, based on the dinocyst species Isabelidinium microarmum and some fern spores and early angiosperm pollen. The Sinpetru Formation, previously dated as Maastrichtian, yielded only terrestrial palynoflora, but with a low content in palynomorphs. Nevertheless, its palynological assemblage, composed of Maastrichtian pollen and spores, indicates lowland or coastal habitats and warm and humid climatic conditions, alternating with periods of arid climate. The palynofacies constituents used to reconstruct the depositional environments suggest that during the Santonian-early late Campanian, strata were laid down in an inner-outer neritic environment (with some fluctuations of water depth). This succession is followed by a deltaic to pond or lake depositions during the Maastrichtian, as indicated by the presence of large translucent phytoclasts in these deposits. A new dinocyst subspecies, Isabelidinium microarmum subsp. bicavatum, which is a distinguishable bicavate cyst, is described herein; this represents a possible key taxon for the lower to lower upper Campanian. (C) 2019 Elsevier Ltd. All rights reserved.
机译：我们提出了基于汉语和西北部的海洋和陆地沉积物的基于杂志学和帕锡的生物和古环境分析。从Rachitova和Sinpetru形成中收集样品。前者占据了陆地和海洋起源的保存完好的宫颈组合，主要由不同的孢子和花粉协会代表，但随着甲藻素的低多样性和低丰度。陆地帕诺芬洛拉由蕨类植物和下属迷魂鱼和贪眼花粉主导。这种组合物表示亚热带植被，以温带温带气候，并向沿海栖息地表明流频，以及排水良好的海拔地区。 Rachitova Chemation在这里作为Santonian-Theed Campanian，基于DinoCyst Isabelidinium microMarum和一些蕨类植物和早期的Angiosperm Pollen。以前作为Maastrichtian的Sinpetru组成，仅产生陆地Palynoflora，但在Palynomorphes中含有较低的含量。尽管如此，由Maastrichtian花粉和孢子组成的椎间切组合，表明了低地或沿海栖息地和温暖和潮湿的气候条件，与干旱的气候相结合。用于重建沉积环境的野生植物成分表明，在Santonian-heak Deding Campanian期间，地层被置于内外的内腔环境（具有一些水深的波动）。这一继承之后是Maastrichtian期间的池塘或湖泊沉积，如这些沉积物中大的半透明植物植物存在所示。一种新的DinoCyst亚种，Isabelidinium microMarmum subsp。本文描述了Bicavatum，其是可区分的双胱天钠;这代表了较低的上部南美南京大学的可能主要分类。 （c）2019年elestvier有限公司保留所有权利。

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