THE TAPHONOMIC CHARACTER, OCCURRENCE, AND PERSISTENCE OF UPPER PERMIAN-LOWER TRIASSIC PLANT ASSEMBLAGES IN THE MID-PALEOLATITUDES, BOGDA MOUNTAINS, WESTERN CHINA

doi:10.2110/palo.2022.025

	THE TAPHONOMIC CHARACTER, OCCURRENCE, AND PERSISTENCE OF UPPER PERMIAN-LOWER TRIASSIC PLANT ASSEMBLAGES IN THE MID-PALEOLATITUDES, BOGDA MOUNTAINS, WESTERN CHINA
	Gastaldo, Robert A.1; Wan, Mingli 2; Yang, Wan 3
刊名	PALAIOS
	2023
卷号	38 期号:1 页码:1-21
ISSN号	0883-1351
DOI	10.2110/palo.2022.025
通讯作者	Gastaldo, Robert A.(ragastal@colby.edu)
英文摘要	The Bogda Mountains, Xianjiang Uygur Autonomous Region, western China, expose an uppermost Permian-Lower Triassic succession of fully continental strata deposited across three graben (half graben) structures in the mid-paleolatitudes of Pangea. A cyclostratigraphy scheme developed for the succession is subdivided into three low-order cycles (Wutonggou, Jiucaiyuan, Shaofanggou). Low-order cycles are partitioned into 1838 high-order cycles based on repetitive environmental changes, and their plant taphonomic character is assessed in. 4700 m of highresolution, measured sections distributed across similar to 100 km. Four taphonomic assemblages are represented by: permineralized wood (both autochthonous and allochthonous), megafloral adpressions (?parautochthonous and allochthonous) identifiable to systematic affinity, unidentifiable (allochthonous) phytoclasts concentrated or disseminated on bedding, and (autochthonous) rooting structures of various configurations (carbon films to rhizoconcretions). Their temporal and spatial occurrences vary across the study area and are dependent on the array of depositional environments exposed in any particular locality. Similar to paleobotanical results in other fully continental basins, megafloral elements are rarely encountered. Both wood (erect permineralized stumps and prostrate logs) and adpressions are found in, 2% of meandering river and limnic cycles, where sediment accumulated under semi-arid to humid conditions. The absence of such assemblages in river-and-lake deposits is more likely related to physical or geographical factors than it is to an absence of organicmatter contribution. With such a low frequency, no predictable pattern or trend to their occurrence can be determined. This is also true for any horizon in which rooting structures are preserved, although paleosols occur in all or parts of high-order cycles developed under arid to humid conditions. Physical rooting structures are encountered in only 23% of these and are not preserved equally across space and time. Allochthonous phytoclasts are the most common taphonomic assemblage, preserved in association with micaceous minerals on bedding in fine-grained lithofacies. The consistency of phytoclast assemblages throughout the succession is empirical evidence for the presence of riparian vegetation during a time when models propose the catastrophic demise of land plants, and does not support an interpretation of vegetational demise followed by long-term recovery across the crisis interval in this basin. These mesofossil and microfossil (palynological) assemblages offer the best opportunity to understand the effects of the crisis on the base of terrestrial ecosystems.
资助项目	U.S. NSF[EAR 1714749] ; U.S. NSF[EAR 171475] ; National Natural Science Foundation of China[41872013] ; Youth Innovation Promotion Association CAS[2020312] ; American Chemical Society Petroleum Research Fund
WOS关键词	MASS EXTINCTION ; ECOLOGICAL PERSISTENCE ; WUTONGGOU FORMATION ; DALONGKOU SECTION ; XINJIANG PROVINCE ; LAKE TANGANYIKA ; OUTCROP AREA ; KAROO BASIN ; GEN. NOV ; DIVERSITY
WOS研究方向	Geology ; Paleontology
语种	英语
出版者	SEPM-SOC SEDIMENTARY GEOLOGY
WOS记录号	WOS:001006039400001
资助机构	U.S. NSF ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; American Chemical Society Petroleum Research Fund
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/42476]
专题	中国科学院南京地质古生物研究所
通讯作者	Gastaldo, Robert A.
作者单位	1.Colby Coll, Dept Geol, Waterville, ME 04901 USA 2.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Ctr Excellence Life & Paleoenvironm, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 3.Missouri Univ Sci & Technol, Geol & Geophys Program, Rolla, MO 65409 USA
推荐引用方式 GB/T 7714	Gastaldo, Robert A.,Wan, Mingli,Yang, Wan. THE TAPHONOMIC CHARACTER, OCCURRENCE, AND PERSISTENCE OF UPPER PERMIAN-LOWER TRIASSIC PLANT ASSEMBLAGES IN THE MID-PALEOLATITUDES, BOGDA MOUNTAINS, WESTERN CHINA[J]. PALAIOS,2023,38(1):1-21.
APA	Gastaldo, Robert A.,Wan, Mingli,&Yang, Wan.(2023).THE TAPHONOMIC CHARACTER, OCCURRENCE, AND PERSISTENCE OF UPPER PERMIAN-LOWER TRIASSIC PLANT ASSEMBLAGES IN THE MID-PALEOLATITUDES, BOGDA MOUNTAINS, WESTERN CHINA.PALAIOS,38(1),1-21.
MLA	Gastaldo, Robert A.,et al."THE TAPHONOMIC CHARACTER, OCCURRENCE, AND PERSISTENCE OF UPPER PERMIAN-LOWER TRIASSIC PLANT ASSEMBLAGES IN THE MID-PALEOLATITUDES, BOGDA MOUNTAINS, WESTERN CHINA".PALAIOS 38.1(2023):1-21.