气候变化领域集成服务门户(CCPortal): Diagenetic patterns in Cretaceous belemnite rostra from Southern Tibet, China: Evaluating criteria to differentiate well preserved and altered fossils

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DOI	10.1016/j.cretres.2023.105825
	Diagenetic patterns in Cretaceous belemnite rostra from Southern Tibet, China: Evaluating criteria to differentiate well preserved and altered fossils
	Fang, Zheng; Alberti, Matthias; Li, Juan; Pan, Yanhong
发表日期	2024
ISSN	0195-6671
EISSN	1095-998X
卷号	157
英文摘要	Belemnites are valuable for reconstructing Jurassic and Cretaceous seawater temperatures, but their reliability hinges on the preservational quality of the fossil materials. Methods for assessing the preservational quality of fossils vary among studies. This research examined altered Cretaceous belemnites and seemingly well preserved Upper Jurassic belemnites from Tibet, aiming to evaluate established methods for differences between well preserved and altered fossil specimens. Results indicate that cathodoluminescence and the manganese content are particularly useful for detecting alterations, correlating strongly with the 318O values. Elevated iron contents generally suggest alteration, though less reliable. Iron incorporation into the rostrum is not always connected to a change in 318O value. Macroscopic features such as fractures, ventral invagination and apical line should be avoided in sampling. The colour of belemnite specimens can also serve as an indication of alteration, but is less reliable. Interestingly, the strontium content of belemnite rostra in our study negatively correlates with 318O values, which contradicts most previous literature results. Finally, by disentangling patterns of diagenetic alteration and carefully correcting raw data for the effects of post-depositional alteration, it seems still possible to obtain useful carbon and oxygen isotopic data from fossil specimens that have suffered diagenetic alteration. Our conclusions are based on, and primarily apply to fossil materials from the Tibetan study area. However, fossils from neighbouring localities in India and Nepal show similar signatures, which shows that our observations are valuable for the broader Himalayan region and likely fossils that experienced similar orogenic processes elsewhere. (c) 2024 Elsevier Ltd. All rights reserved.
关键词	Belemnite Palaeotemperature Taphonomy Stable carbon isotope Stable oxygen isotope
英文关键词	MULTICOMPONENT CARBONATE SYSTEM; OXYGEN-ISOTOPE FRACTIONATION; SEA-SURFACE TEMPERATURE; CATHODOLUMINESCENCE MICROSCOPY; SEAWATER TEMPERATURE; CHEMICAL DIAGENESIS; FALKLAND PLATEAU; MYTILUS-EDULIS; WESTERN INDIA; OYSTER SHELLS
WOS研究方向	Geology ; Paleontology
WOS记录号	WOS:001156435600001
来源期刊	CRETACEOUS RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283257
作者单位	Nanjing University; Nanjing University; University of Kiel; Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Fang, Zheng,Alberti, Matthias,Li, Juan,et al. Diagenetic patterns in Cretaceous belemnite rostra from Southern Tibet, China: Evaluating criteria to differentiate well preserved and altered fossils[J],2024,157.
APA	Fang, Zheng,Alberti, Matthias,Li, Juan,&Pan, Yanhong.(2024).Diagenetic patterns in Cretaceous belemnite rostra from Southern Tibet, China: Evaluating criteria to differentiate well preserved and altered fossils.CRETACEOUS RESEARCH,157.
MLA	Fang, Zheng,et al."Diagenetic patterns in Cretaceous belemnite rostra from Southern Tibet, China: Evaluating criteria to differentiate well preserved and altered fossils".CRETACEOUS RESEARCH 157(2024).