A new cordaitean pollen cone and pollen grains in situ from the Early Permian of Hexi Corridor and its geotectonic significance

doi:10.1016/j.palaeo.2016.10.014

	A new cordaitean pollen cone and pollen grains in situ from the Early Permian of Hexi Corridor and its geotectonic significance
	Wang, Zixi 1,2,3; Sun, Bainian 1,2,3; Wang, Xuelian 1,2; Chen, Yingquan 1,2; Sun, Fankai 1,2; Xiong, Conghui 1,2,3
	2016-12-01
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	463 页码:261-274
摘要	A new species of cordaitean pollen cone is described and diagnosed from early Permian strata in Gansu Province, northwestern China. The gross morphology and well-preserved features of the species, named Cordaianthus yongchangensis Z. X. Wang et B. N. Sun sp. nov., have been studied in detail. The current fossil has helically arranged bracts and secondary fertile shoots. The bract, longer and wider than in other known fossils, diverges at approximately 90 from the axis; the secondary fertile shoots are obovate with scales on individual shoots, and fertile scales concentrated near the apex of the secondary fertile shoots. More than five pollen sacs are clustered on the fertile scales, which number 8-13. As the current species differs from any known species in the fossil records, it is considered as a new species of Cordaianthus. The species, with its microstructure of bracts and scales, in situ pollen sacs and pollen grains, provides important clues on the evolution of Cordaitopsida. Based on the known reproductive organs of cordaitean plants, we discovered that the current fossil, with its wide bracts that protect the helically arranged secondary fertile shoots, is similar to modern conifer cones, suggesting that the current fossil is an evolutionally advanced species. In comparisons with cordaitean fossils, the leaves of cordaitean plants from the ALT (Alashan Terrane) during the early Permian presented mixed leaf features of specimens from the NCB (North China Block) and SCB (South China Block). In conclusion, the ALT was already located between the NCB and SCB in the Early Permian. (C) 2016 Elsevier B.V. All rights reserved.
关键词	Hexi Corridor Early Permian Cordaianthus Pollen cone Microstructure Geotectonic significance
DOI	10.1016/j.palaeo.2016.10.014
语种	英语
关键词[WOS]	NORTH CHINA BLOCK ; CORDAITALEAN SEED PLANTS ; RECONSTRUCTION
资助项目	Specialized Research Fund for the National Natural Science Foundation of China[41172022] ; Fundamental Research Funds for the Central Universities[lzujbky-2016-202] ; Foundation of the State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, China Academy of Sciences[163117]
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000387526000020
项目资助者	Specialized Research Fund for the National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Foundation of the State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, China Academy of Sciences
出版者	ELSEVIER SCIENCE BV
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/12339
专题	中国科学院南京地质古生物研究所
通讯作者	Sun, Bainian
作者单位	1.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China 2.Lanzhou Univ, Key Lab Mineral Resources Western China Gansu Pro, Lanzhou 730000, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, State Key Lab Paleobiol & Stratig, Beijing 100864, Peoples R China
推荐引用方式 GB/T 7714	Wang, Zixi,Sun, Bainian,Wang, Xuelian,et al. A new cordaitean pollen cone and pollen grains in situ from the Early Permian of Hexi Corridor and its geotectonic significance[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2016,463:261-274.
APA	Wang, Zixi,Sun, Bainian,Wang, Xuelian,Chen, Yingquan,Sun, Fankai,&Xiong, Conghui.(2016).A new cordaitean pollen cone and pollen grains in situ from the Early Permian of Hexi Corridor and its geotectonic significance.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,463,261-274.
MLA	Wang, Zixi,et al."A new cordaitean pollen cone and pollen grains in situ from the Early Permian of Hexi Corridor and its geotectonic significance".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 463(2016):261-274.