干旱区生态环境知识资源中心(Arid): Aminochronology and time averaging of Quaternary land snail assemblages from colluvial deposits in the Madeira Archipelago, Portugal

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DOI	10.1017/qua.2019.1
	Aminochronology and time averaging of Quaternary land snail assemblages from colluvial deposits in the Madeira Archipelago, Portugal
	New, Evan; Yanes, Yurena; Cameron, Robert A. D.; Miller, Joshua H.; Teixeira, Dinarte; Kaufman, Darrell S.
通讯作者	New, E (corresponding author), Univ Cincinnati, Dept Geol, 500 Geol Phys Bldg,345 Clifton Court, Cincinnati, OH 45221 USA.
来源期刊	QUATERNARY RESEARCH
ISSN	0033-5894
EISSN	1096-0287
出版年	2019
卷号	92 期号:2 页码:483-496
英文摘要	Understanding the properties of time averaging (age mixing) in a stratigraphic layer is essential for properly interpreting the paleofauna preserved in the geologic record. This work assesses the age and quantifies the scale and structure of time averaging of land snail-rich colluvial sediments from the Madeira Archipelago (Portugal) by dating individual shells using amino acid racemization calibrated with graphite-target and carbonate-target accelerator mass spectrometry radiocarbon methods. Gastropod shells of Actinella nitidiuscula were collected from seven sites on the volcanic islands of Bugio and Deserta Grande (Desertas Islands), where snail shells are abundant and well preserved in Quaternary colluvial deposits. Results show that the shells ranged in age from modern to similar to 48 cal ka BP (calibrated radiocarbon age), covering the last glacial and present interglacial periods. Snail shells retrieved from two of the colluvial sites exhibit multimillennial age mixing (>6 ka), which significantly exceeds the analytical error from dating methods and calibration. The observed multimillennial mixing of these assemblages should be taking into consideration in upcoming paleoenvironmental and paleoecological studies in the region. The extent of age mixing may also inform about the time span of colluvial deposition, which can be useful in future geomorphological studies. In addition, this study presents the first carbonate-target radiocarbon results for land snail shells and suggests that this novel, rapid, and more affordable dating method offers reliable age estimates for small land snail shells younger than similar to 20 cal ka BP.
英文关键词	Age mixing Amino acid racemization Carbonate-target C-14 dating Land snails Quaternary Desertas Islands
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000487316500015
WOS关键词	AMINO-ACID RACEMIZATION ; DEATH ASSEMBLAGES ; QUANTITATIVE COMPARISONS ; ECOLOGICAL FIDELITY ; MOLLUSK SHELLS ; ASPARTIC-ACID ; ADRIATIC SEA ; HOLOCENE ; AGE ; RADIOCARBON
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369550
作者单位	[New, Evan; Yanes, Yurena; Miller, Joshua H.] Univ Cincinnati, Dept Geol, 500 Geol Phys Bldg,345 Clifton Court, Cincinnati, OH 45221 USA; [Cameron, Robert A. D.] Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England; [Teixeira, Dinarte] Madeira Govt, IP RAM, Inst Forests & Nat Conservat, P-9000715 Madeira, Portugal; [Teixeira, Dinarte] Univ Helsinki, Finnish Museum Nat Hist, LIBRe Lab Integrat Biodivers Res, Helsinki 00014, Finland; [Kaufman, Darrell S.] No Arizona Univ, Sch Earth & Sustainabil, Flagstaff, AZ 86001 USA
推荐引用方式 GB/T 7714	New, Evan,Yanes, Yurena,Cameron, Robert A. D.,et al. Aminochronology and time averaging of Quaternary land snail assemblages from colluvial deposits in the Madeira Archipelago, Portugal[J],2019,92(2):483-496.
APA	New, Evan,Yanes, Yurena,Cameron, Robert A. D.,Miller, Joshua H.,Teixeira, Dinarte,&Kaufman, Darrell S..(2019).Aminochronology and time averaging of Quaternary land snail assemblages from colluvial deposits in the Madeira Archipelago, Portugal.QUATERNARY RESEARCH,92(2),483-496.
MLA	New, Evan,et al."Aminochronology and time averaging of Quaternary land snail assemblages from colluvial deposits in the Madeira Archipelago, Portugal".QUATERNARY RESEARCH 92.2(2019):483-496.