A palaeoenvironmental reconstruction of the Middle Jurassic of Sardinia (Italy) based on integrated palaeobotanical, palynological and lithofacies data assessment
A palaeoenvironmental reconstruction of the Middle Jurassic of Sardinia (Italy) based on integrated palaeobotanical, palynological and lithofacies data assessment
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DOI：
10.1007/s12549-017-0306-z
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发表时间：
2017
影响因子：
1.4
通讯作者：
L. Costamagna;E. Kustatscher;G. G. Scanu-G.;M. del Río;P. Pittau;Johanna H. A. van Konijnenburg-van Cittert-Johanna-H.-A.-van-Konijnenburg-van-Cittert-151478095
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文献类型：
--
作者：
L. Costamagna;E. Kustatscher;G. G. Scanu-G.;M. del Río;P. Pittau;Johanna H. A. van Konijnenburg-van Cittert-Johanna-H.-A.-van-Konijnenburg-van-Cittert-151478095
在侏罗纪时期，撒丁岛靠近欧洲大陆。出现的陆地是从一个岛屿开始的，随着时间的推移，逐渐形成了一个下沉的群岛。这一复杂的古地理环境造就了具有多种生境的多样景观。对Genna Selole组进行了基于收集和文献的古植物学、孢粉学和岩相学研究，以进行古环境解释。它们证明了一个普遍温暖和潮湿的气候，偶尔受到干燥时期的影响。在这种气候中可以识别出几种不同的生态系统，包括具有辫状河流的冲积扇（Laconi-Gadoni岩相），沼泽沼泽和海岸（Nurri-Escalaplano岩相），以及泻湖和浅海环境（Ussassai-Perdasdefogu岩相）。非海洋环境被广泛的低地和减少沿海和潮汐影响的环境所覆盖。河流和高地/内陆环境对重建的影响有限。孢粉组合和古植物组合之间的差异证明了仅使用其中一种替代物所获得的差异。宏观遗迹反映当地的古环境更好，虽然受到运输偏见（例如失踪的高地元素和微妙的器官），而polynomorphs允许重建区域古气候。考虑到撒丁岛的植物群是所有中侏罗世欧洲植物群的最南端，这项多学科的研究增加了我们对那段时间陆地环境的了解。
During the Jurassic, Sardinia was close to continental Europe. Emerged lands started from a single island forming in time a progressively sinking archipelago. This complex palaeogeographic situation gave origin to a diverse landscape with a variety of habitats. Collection- and literature-based palaeobotanical, palynological and lithofacies studies were carried out on the Genna Selole Formation for palaeoenvironmental interpretations. They evidence a generally warm and humid climate, affected occasionally by drier periods. Several distinct ecosystems can be discerned in this climate, including alluvial fans with braided streams (Laconi-Gadoni lithofacies), paralic swamps and coasts (Nurri-Escalaplano lithofacies), and lagoons and shallow marine environments (Ussassai-Perdasdefogu lithofacies). The non-marine environments were covered by extensive lowland and a reduced coastal and tidally influenced environment. Both the river and the upland/hinterland environments are of limited impact for the reconstruction. The difference between the composition of the palynological and palaeobotanical associations evidence the discrepancies obtained using only one of those proxies. The macroremains reflect the local palaeoenvironments better, although subjected to a transport bias (e.g. missing upland elements and delicate organs), whereas the palynomorphs permit to reconstruct the regional palaeoclimate. Considering that the flora of Sardinia is the southernmost of all Middle Jurassic European floras, this multidisciplinary study increases our understanding of the terrestrial environments during that period of time.