GSTDTAP  > 地球科学
DOI10.1130/B31890.1
Calibration of chron C29r: New high-precision geochronologic and paleomagnetic constraints from the Hell Creek region, Montana
Sprain, Courtney J.1,7; Renne, Paul R.1,2,7; Clemens, William A.3,4; Wilson, Gregory P.5,6
2018-09-01
发表期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
EISSN1943-2674
出版年2018
卷号130页码:1615-1644
文章类型Article
语种英语
国家USA; England
英文摘要

The mass extinction at the Cretaceous-Paleogene boundary marks one of the most important biotic turnover events in Earth history. Yet, despite decades of study, the causes of the Cretaceous-Paleogene boundary crises remain under debate. An important tool that has the capacity to greatly improve our understanding of the events around the Cretaceous-Paleogene boundary is the geomagnetic polarity time scale (GPTS). The GPTS is used for age control in numerous Cretaceous-Paleogene boundary studies, including the timing of Deccan Traps volcanism, a majority of studies in marine sections, and studies on climate and ecological change across the Cretaceous-Paleogene boundary. The current calibration of the GPTS for circum-Cretaceous-Paleogene boundary polarity chron (C30n-C28n) from the Geologic Time Scale draws heavily on astronomical tuning and uses a Ar-40/Ar-39 age for the Cretaceous-Paleogene boundary as a tie point that has since been shown to be 200 ka too old. Furthermore, complex sedimentation has been recorded in marine sections immediately following the Cretaceous-Paleogene boundary, which can possibly obscure orbital signals and complicate cyclostratigraphic interpretation. An independent test of the cyclostratigraphy for this time period is imperative for confidence in the astronomical time scale. Further, polarity reversal ages given in the GPTS do not include uncertainty estimates, making them unsuitable for quantitative chronometry. Recent calibrations have been attempted using U/Pb geochronology on zircons; however, U/Pb zircon dates may be biased by pre-eruptive zircon residence times of tens to hundreds of thousands of years.


In this study, we provide constraints on the timing and duration of the most important circum-Cretaceous-Paleogene boundary chron, chron C29r, using high-precision Ar-40/Ar-39 geochronology and magnetostratigraphy on fluvial sediments from the Hell Creek region, Montana. Here, we show results for 14 new magnetostratigraphic sections, and 18 new high-precision Ar-40/Ar-39 dates, which together provide six independent constraints on the age of the C29r/C29n reversal and two constraints on the C30n/C29r reversal. Together, these results show that the duration of C29r was 587 +/- 53 ka, consistent with the most recent Geologic Time Scale calibration and previous U-Pb age models. We further present new geochronologic data for the Cretaceous-Paleogene boundary that provide the most precise date yet, of 66.052 +/- 0.008/0.043 Ma. Integration of our results into the extensive paleontological framework for this region further provides important constraints on rates of terrestrial faunal change across the Cretaceous-Paleogene boundary.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000443133000012
WOS关键词CRETACEOUS-PALEOGENE BOUNDARY ; U-PB GEOCHRONOLOGY ; ZUMAIA BASQUE BASIN ; ASTRONOMICAL CALIBRATION ; TERTIARY BOUNDARY ; DECCAN VOLCANISM ; NORTH-DAKOTA ; AR-40/AR-39 GEOCHRONOLOGY ; TULLOCK FORMATIONS ; MASS EXTINCTION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
被引频次:103[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/25141
专题地球科学
作者单位1.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA;
2.Berkeley Geochronol Ctr, 2455 Ridge Rd, Berkeley, CA 94709 USA;
3.Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA;
4.Univ Calif Berkeley, Museum Paleontol, Berkeley, CA 94720 USA;
5.Univ Washington, Dept Biol, Seattle, WA 98195 USA;
6.Univ Washington, Burke Museum Nat Hist & Culture, Seattle, WA 98195 USA;
7.Univ Liverpool, Geomagnetism Lab, Dept Earth Ocean & Ecol Sci, Liverpool L69 7ZE, Merseyside, England
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GB/T 7714
Sprain, Courtney J.,Renne, Paul R.,Clemens, William A.,et al. Calibration of chron C29r: New high-precision geochronologic and paleomagnetic constraints from the Hell Creek region, Montana[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:1615-1644.
APA Sprain, Courtney J.,Renne, Paul R.,Clemens, William A.,&Wilson, Gregory P..(2018).Calibration of chron C29r: New high-precision geochronologic and paleomagnetic constraints from the Hell Creek region, Montana.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,1615-1644.
MLA Sprain, Courtney J.,et al."Calibration of chron C29r: New high-precision geochronologic and paleomagnetic constraints from the Hell Creek region, Montana".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):1615-1644.
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