globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.02.006
论文题名:
New record of fossil wood Xenoxylon from the Late Triassic in the Sichuan Basin, southern China and its paleoclimatic implications
作者: Tian N.; Wang Y.; Philippe M.; Li L.; Xie X.; Jiang Z.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 464
起始页码: 65
结束页码: 75
语种: 英语
英文关键词: Late Triassic ; Paleoclimate ; Sichuan Basin ; Southern China ; Xenoxylon ; Xujiahe Formation
英文摘要: Fossil wood is one of the significant proxies for terrestrial paleoclimate and paleogeographical reconstruction in Earth history. Abundant and diversified Mesozoic fossil woods are well recorded in China; however, Triassic fossil wood is very scarce. Here, we report a new fossil wood from the Late Triassic Xujiahe Formation (Norian to Rhaetian) in Guangyuan of northern Sichuan Basin, southwestern China. The fossil wood material consists of two well-preserved specimens yielding secondary xylem with distinct growth rings. Bordered pits on the radial tracheid walls are mostly contiguous, biseriate alternate, locally uniseriate and strongly flattened. Cross-fields show a large window-like pore. This anatomy is typical for the important fossil wood morphogenus Xenoxylon Gothan, and, based on a novel combination of radial and cross-field pitting type and ray height, a new species, Xenoxylon guangyuanense sp. nov. is recognized. The finding of this new fossil wood taxon contributes to a better understanding of the yet poorly documented Xenoxylon early radiation during the Late Triassic, as well as of the origin of X. meisteri group, a peculiar endemic group which diversified in Far-East Asia from the Triassic to the Early Cretaceous. Xenoxylon is a paleobiogeographically significant genus, being bound to cooler and/or wetter climates of Northern Hemisphere throughout its Late Triassic-Late Cretaceous range. The occurrence of Xenoxylon in the Sichuan Basin of southern China may indicate a short-term cooling event, sandwiched within a period during which warm and wet climate conditions largely prevailed over lower latitude regions of the Northern Hemisphere. Such a cooling event in the Sichuan Basin which was located at a low paleolatitude on the eastern rim of Tethys may be in accordance in time with the temperature decline event in Norian-Rhaetian boundary uncovered by oxygen isotope (δ18O) record in Italy of the western rim of Tethys. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68179
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作者单位: College of Paleontology, Shenyang Normal University, Shenyang, China; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS), Nanjing, China; Key Laboratory for Evolution of Past Life in Northeast Asia, Ministry of Land and Resources, Shenyang, China; Laboratoire de Géologie de Lyon, Université Claude Bernard Lyon 1 and CNRS, Campus de la DOUA, Bâtiment, Darwin A, Villeurbanne Cedex, France; College of Geography and Tourism, Qufu Normal University, Rizhao, China; Chinese Academy of Geological Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Tian N.,Wang Y.,Philippe M.,et al. New record of fossil wood Xenoxylon from the Late Triassic in the Sichuan Basin, southern China and its paleoclimatic implications[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,464
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