The late Paleozoic palynological diversity in southernmost Paraná (Uruguay), Claromecó and Paganzo basins (Argentina), Western Gondwana
The late Paleozoic palynological diversity in southernmost Paraná (Uruguay), Claromecó and Paganzo basins (Argentina), Western Gondwana
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DOI：
10.1016/j.jsames.2015.10.011
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发表时间：
2015-12
影响因子：
1.8
通讯作者：
Á. Beri;Pedro R. Gutiérrez;M. L. Balarino
中科院分区：
文献类型：
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作者：
Á. Beri;Pedro R. Gutiérrez;M. L. Balarino
研究了乌拉圭巴拉那盆地DI.NA.MI.GE.254孔(26个样品)和DI.NA.MI.GE.221孔(14个样品)以及阿根廷的La Deheza组(Paganzo盆地)的18个地表样品和UTAL.CMM1.La Estrella.x-1(Claromecó盆地)的10个钻孔中晚古生代孢粉植物群多样性的变化。研究了西冈瓦那生物地层带、多样性水平、相和气候演化模式之间的可能关系。221孔、254孔和La Deheza组露头的多样性曲线显示出相似的多样性演化模式，即下层多样性增加，上层多样性减少。消失事件被确定为在西苏拉期至瓜达卢皮亚期的生物带中较为突出，而在西苏拉期早期的生物带中不太明显。属的数量从冰海相，经过三角洲和海相，一直上升到浅海或泻湖相，消失率变得更加突出。。拉埃斯特雷拉钻孔下部的多样性比其他层序的多样性小，这些多样性、消失和出现的行为可能反映了冰后期气候改善的模式和干旱阶段的开始
This study explores the changes in palynoflora diversity of the late Paleozoic in boreholes DI.NA.MI.GE. 254 (26 samples) and DI.NA.MI.GE. 221 (14 samples) of the Paraná Basin in Uruguay and in 18 surface samples of the La Deheza Formation (Paganzo Basin) and 10 samples of borehole UTAL.CMM1.La Estrella.x-1 (Claromecó Basin) in Argentina. Possible relationships among biostratigraphic zones, diversity levels, facies and climatic evolution patterns in Western Gondwana are studied. Diversity curves of boreholes 221 and 254 and the La Deheza Formation outcrop exhibit similar diversity evolution patterns, i.e., an increase in lower strata diversity and a decrease in upper strata diversity. The disappearance events are determined to be more prominent in biozones of the Cisuralian to the Guadalupian age and less prominent in biozones of the early Cisuralian age. The number of genera raises from the glaciomarine facies, through the deltaic and the marine facies, up to the shallow marine or lagoon facies, in which the disappearance rates become more prominent. . The diversity of the lower part of the La Estrella borehole is lesser than that of the other sequences These diversity, disappearance and appearance behaviors may reflect post-glacial climatic amelioration patterns and the beginning of an arid phase