Timing of Early and Middle Permian deglaciation of the southern hemisphere: Brachiopod-based Sr-87/Sr-86 calibration

doi:10.1016/j.epsl.2019.03.039

	Timing of Early and Middle Permian deglaciation of the southern hemisphere: Brachiopod-based Sr-87/Sr-86 calibration
	Garbelli, C.2,3; Shen, S. Z.5; Immenhauser, A.4; Brand, U.6; Buhl, D.4; Wang, W. Q.2,3; Zhang, H.2,3; Shi, G. R.1
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2019-06-15
卷号	516 页码:122-135
关键词	Late Paleozoic Ice Age brachiopod shell archives Sr-isotope chemostratigraphy Sydney Basin P1-P3 glacial-interglacial cycles deglaciation
ISSN号	0012-821X
DOI	10.1016/j.epsl.2019.03.039
英文摘要	Earth's transition from an icehouse to hothouse during the Late Paleozoic was characterized by a series of high paleolatitude glacial-interglacial events. However, the exact timing of these events remains unresolved. Here, we report on fifty-five calcitic shells of brachiopods and bivalves screened to obtain reliable Sr-87/Sr-86 ratios for Cisuralian (298.9-272.95 Ma) and Guadalupian (272.95-259.1 Ma) seawater. Specifically, we used well-preserved shells to build a Sr-87/Sr-86 seawater curve for the Sydney Basin, and then with the marine Look-up Table of the Permian calculated numerical ages of the stratigraphic succession. This allowed us to match seawater changes to the coeval P1 - P3 glacial-interglacial cycles recorded in the sedimentary successions of the Sydney Basin. Evaluation of the Sr-87/Sr-86 results revealed that onsets of the P2 and P3 glaciations in the Sydney Basin should be assigned to the early Artinskian and late Wordian, respectively. The range of Sr-87/Sr-86 values recorded by brachiopods from the Wandrawandian Siltstone coupled with recent geochronological dating of the Broughton Formation suggest that glacial phase P3 lasted about 2 Myr and was confined to the late Wordian - early Capitanian. Dating obtained using the Sr-isotope proxy from brachiopods agrees with the geochronologic ages, and they suggest that the glacial phases P1 to P3 became progressively shorter in duration and less intense. Conversely, the corresponding interglacials became progressively longer, and thus, documenting the gradual transition of the Permian icehouse to an ice-free greenhouse world. Our study confirms that strontium isotopes measured in screened brachiopod shell archives are sufficiently robust to date Paleozoic marine sedimentary successions, and are most valuable in sedimentary successions that otherwise lack geo-chronological dating. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB26000000] ; Natural Science Foundation of China[41420104003] ; CAS[QYZDY-SSW-DQC023] ; China Postdoctoral Science Foundation[2016M591939] ; PIFI initiative of CAS[2018PC0042] ; Australian Research Council[ARC DP150100690]
WOS关键词	PALEOZOIC ICE-AGE ; WASP HEAD FORMATION ; SYDNEY BASIN ; SEAWATER-CHEMISTRY ; EASTERN AUSTRALIA ; MARINE ; RECORD ; SIGNATURES ; OXYGEN ; CARBON
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000470047100010
资助机构	Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Natural Science Foundation of China ; CAS ; China Postdoctoral Science Foundation ; PIFI initiative of CAS ; Australian Research Council
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/38547]
专题	中国科学院南京地质古生物研究所
通讯作者	Garbelli, C.; Shen, S. Z.
作者单位	1.Univ Wollongong, Sch Earth Atmospher & Life Sci, Northfields Ave, Wollongong, NSW 2522, Australia 2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China 4.Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44801 Bochum, Germany 5.Nanjing Univ, Sch Earth Sci & Engn, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China 6.Brock Univ, Dept Earth Sci, 1812 Sir Isaac Brock Way, St Catharines, ON L2S 3A1, Canada
推荐引用方式 GB/T 7714	Garbelli, C.,Shen, S. Z.,Immenhauser, A.,et al. Timing of Early and Middle Permian deglaciation of the southern hemisphere: Brachiopod-based Sr-87/Sr-86 calibration[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,516:122-135.
APA	Garbelli, C..,Shen, S. Z..,Immenhauser, A..,Brand, U..,Buhl, D..,...&Shi, G. R..(2019).Timing of Early and Middle Permian deglaciation of the southern hemisphere: Brachiopod-based Sr-87/Sr-86 calibration.EARTH AND PLANETARY SCIENCE LETTERS,516,122-135.
MLA	Garbelli, C.,et al."Timing of Early and Middle Permian deglaciation of the southern hemisphere: Brachiopod-based Sr-87/Sr-86 calibration".EARTH AND PLANETARY SCIENCE LETTERS 516(2019):122-135.