The Permian (Kungurian, Cisuralian) palaeoenvironment and palaeoclimate of the Tregiovo Basin, Italy: Palaeobotanical, palynological and geochemical investigations
| Autor: | Forte G.[1, Kustatscher E.[2, Roghi G.[4], Preto N.[1] |
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| Rok vydání: | 2018 |
| Předmět: |
Lacustrine deposit
010506 paleontology Sphenobaiera Permian Î 13Corg 010502 geochemistry & geophysics Oceanography 01 natural sciences Paleontology Macroflora Fossil plants Sedimentology Organic carbon Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Earth-Surface Processes Palynology δ13C biology Playa lake Early Permian Fossil plants Lacustrine deposit Organic carbon Playa lake Î13Corg Paleontology biology.organism_classification delta C-13(org) Early Permian Terrestrial ecosystem Annularia Geology |
| Zdroj: | Palaeogeography, palaeoclimatology, palaeoecology 495 (2018): 186–204. doi:10.1016/j.palaeo.2018.01.012 info:cnr-pdr/source/autori:Forte G.[1,2], Kustatscher E.[2,3], Roghi G.[4], Preto N.[1]/titolo:The Permian (Kungurian, Cisuralian) palaeoenvironment and palaeoclimate of the Tregiovo Basin, Italy: Palaeobotanical, palynological and geochemical investigations/doi:10.1016%2Fj.palaeo.2018.01.012/rivista:Palaeogeography, palaeoclimatology, palaeoecology/anno:2018/pagina_da:186/pagina_a:204/intervallo_pagine:186–204/volume:495 |
| ISSN: | 0031-0182 |
| DOI: | 10.1016/j.palaeo.2018.01.012 |
| Popis: | A transition from widespread humid to more drought tolerant floras characterized tropical terrestrial ecosystems during the Permian (Cisuralian). Tregiovo (Southern Alps, N-Italy) is one of the very few well dated Kungurian (late Cisuralian) plant localities in Euramerica. It was located in eastern palaeoequatorial Pangea. Two units bearing fossil plant assemblages occur in finely laminated sediments deposited in a playa-lake environment. In this paper, the sedimentology of the Tregiovo Basin is reviewed, and new palaeobotanical, palynological and stable isotopic data are presented, in order to reconstruct the palaeoclimatic and palaeoenvironmental conditions of the Kungurian in the Southern Alps. Both fossil plant assemblages are dominated by conifers (Hermitia, Feysia, Quadrocladus, Dolomitia), together with sphenophytes (Annularia), ginkgophytes (Sphenobaiera), pteridosperms (Peltaspermum), taeniopterids and sphenopterids. These taxa, which occur with different abundances in the two plant assemblages, both indicate semi-arid conditions. Associated palynofiora, dominated by bisaccate pollen, and extremely rare spore occurrences, is consistent with the xerophytic character of the macroflora, and suggests that the fossil plant record was not affected by collection or preservation bias. Stable isotopic analyses of two stratigraphic sections reveal an upward trend of increasingly negative delta C-13(org) (VPDB), which may correlate with roughly coeval records from marine and continental successions such as in North China and South Africa. This isotopic shift may be attributed to a global perturbation of atmospheric delta C-13, although the influence of local environmental factors cannot be excluded. |
| Databáze: | OpenAIRE |
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