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Ota, Hayu; Kuroda, Junichiro; Orihashi, Yuji; Schmitz, Mark D; Takashima, Reishi (2026): Zircon U-Pb age data from a tuff sample (KRP072) of the Kawaruppu section [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.994126

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Published: 2026-05-19 • DOI registered: 2026-05-19

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Abstract:
This dataset contains zircon U-Pb age data from a tuff sample (KRP072) collected at the Kawaruppu section, Nemuro Group, Hokkaido, Japan. The sample derives from the Upper Cretaceous-lower Paleogene succession investigated for stratigraphic assessment of the Cretaceous-Paleogene boundary interval. Zircon U-Pb analyses were performed by chemical abrasion-isotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) at Boise State University (BSU) Isotope Geology Laboratory.
Keyword(s):
Cretaceous-Paleogene boundary; East Asia; IODP³; Osmium; zircon U-Pb geochronology
Supplement to:
Ota, Hayu; Kuroda, Junichiro; Hayashi, Keiichi; Hoshi, Hiroyuki; Sawada, Ken; Hosogaya, Kohei; Nishi, Hiroshi; Ishikawa, Akira; Suzuki, Katsuhiko; Ikeda, Masashi A; Orihashi, Yuji; Schmitz, Mark; Gyawali, Babu Ram; Matsumoto, Hironao; Takashima, Reishi (2026): The Chicxulub impact signature in East Asia. Communications Earth & Environment, https://doi.org/10.1038/s43247-026-03602-z
Funding:
Japan Society for the Promotion of Science (JSPS), grant/award no. 17K05674: High resolution age model and paleoenvironmental change for K/Pg boundary
Japan Society for the Promotion of Science (JSPS), grant/award no. 18KK0091: Improvement of Cretaceous Geologic Time Scale
Japan Society for the Promotion of Science (JSPS), grant/award no. 21H04503: Environmental changes during the Latest Cretaceous Mass Extinction Event recorded in the complete K/Pg boundary sequence discovered firstly in East Asia
Japan Society for the Promotion of Science (JSPS), grant/award no. 22H01342: The Cretaceous-Paleogene Boundary in the Southern Hemisphere: Osmium isotopic record to fingerprint flood basalt volcanism
Japan Society for the Promotion of Science (JSPS), grant/award no. 22K18426: Linkage of the Earth's tipping points and the subseafloor biosphere
Japan Society for the Promotion of Science (JSPS), grant/award no. 23H00153: Analysis of internal Earth nitrogen using pupulin nitrogen isotope ratio
Japan Society for the Promotion of Science (JSPS), grant/award no. JPJSCCA20250004: Warm-period Climate Change Research Center with the International Ocean Drilling School [WarmCCR]
Coverage:
Median Latitude: 43.098419 * Median Longitude: 143.729519 * South-bound Latitude: 43.098055 * West-bound Longitude: 143.727351 * North-bound Latitude: 43.098784 * East-bound Longitude: 143.731687
Date/Time Start: 2015-08-27T00:00:00 * Date/Time End: 2024-08-24T00:00:00
Minimum SECTION, height: 178 m * Maximum SECTION, height: 178 m
Event(s):
Kawaruppu_section  * Latitude Start: 43.098784 * Longitude Start: 143.727351 * Latitude End: 43.098055 * Longitude End: 143.731687 * Date/Time Start: 2015-08-27T00:00:00 * Date/Time End: 2024-08-24T00:00:00 * Location: Hokkaido, Japan * Method/Device: Outcrop sample (OUTCROP)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEventTakashima, Reishi
2 Sample code/labelSample labelTakashima, Reishi
3 SECTION, heightSectionmTakashima, ReishiGeocode – Stratigraphic levels are given in meters from the base of the Kawaruppu section, which is defined as 0 m.
4 Main LithologyMain lithTakashima, Reishi
5 Thorium/Uranium ratioTh/USchmitz, Mark DCalculatedModel Th/U ratio iteratively calculated from the radiogenic 208Pb/206Pb ratio and 206Pb/238U age.
6 Lead-206206PbnmolSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
7 Lead-206206Pb%Schmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)mol %- radiogenic 206Pb with respect to radiogenic, blank and initial common Pb.
8 Lead, radiogenic/Lead ratioPb rad/PbSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
9 LeadPbpgSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
10 Lead-206/Lead-204 ratio206Pb/204PbSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
11 Lead-208/Lead-206 ratio208Pb/206PbSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
12 Lead-207/Lead-206 ratio207Pb/206PbSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
13 Lead-207/Lead-206 ratio, error, relative207Pb/206Pb e rel%Schmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
14 Lead-207/Uranium-235 ratio207Pb/235USchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
15 Lead-207/Uranium-235 ratio, error, relative207Pb/235U e rel%Schmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
16 Lead-206/Uranium-238 ratio206Pb/238USchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
17 Lead-206/Uranium-238 ratio, error, relative206Pb/238U e rel%Schmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
18 Correlation coefficient, isotope ratio errorRhoSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
19 Lead-207/Lead-206 ratio207Pb/206PbSchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
20 Lead-207/Lead-206 ratio, error207Pb/206Pb e±Schmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
21 Lead-207/Uranium-235 ratio207Pb/235USchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
22 Lead-207/Uranium-235 ratio, error207Pb/235U e±Schmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
23 Lead-206/Uranium-238 ratio206Pb/238USchmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
24 Lead-206/Uranium-238 ratio, error206Pb/238U e±Schmitz, Mark DZircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
132 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Sample label		3 
Section [m]
(Stratigraphic levels are give...)		4 
Main lith		5 
Th/U
(Model Th/U ratio iteratively ...)		6 
206Pb [nmol]
(Zircon U/Pb dating by chemica...)		7 
206Pb [%]
(mol %- radiogenic 206Pb with ...)		8 
Pb rad/Pb
(Zircon U/Pb dating by chemica...)		9 
Pb [pg]
(Zircon U/Pb dating by chemica...)		10 
206Pb/204Pb
(Zircon U/Pb dating by chemica...)		11 
208Pb/206Pb
(Zircon U/Pb dating by chemica...)		12 
207Pb/206Pb
(Zircon U/Pb dating by chemica...)		13 
207Pb/206Pb e rel [%]
(Zircon U/Pb dating by chemica...)		14 
207Pb/235U
(Zircon U/Pb dating by chemica...)		15 
207Pb/235U e rel [%]
(Zircon U/Pb dating by chemica...)		16 
206Pb/238U
(Zircon U/Pb dating by chemica...)		17 
206Pb/238U e rel [%]
(Zircon U/Pb dating by chemica...)		18 
Rho
(Zircon U/Pb dating by chemica...)		19 
207Pb/206Pb
(Zircon U/Pb dating by chemica...)		20 
207Pb/206Pb e [±]
(Zircon U/Pb dating by chemica...)		21 
207Pb/235U
(Zircon U/Pb dating by chemica...)		22 
207Pb/235U e [±]
(Zircon U/Pb dating by chemica...)		23 
206Pb/238U
(Zircon U/Pb dating by chemica...)		24 
206Pb/238U e [±]
(Zircon U/Pb dating by chemica...)
Kawaruppu_section KRP072-z5178tuff0.3940.0000179198.79240.1814940.1260.0474280.3800.0671270.4070.0102700.0500.61966.629.0365.970.2665.9520.033
Kawaruppu_sectionKRP072-z1178tuff0.5170.0000430198.88270.4016150.1660.0473800.2630.0669080.2850.0102470.0430.59664.216.2665.760.1865.8040.028
Kawaruppu_sectionKRP072-z2178tuff0.5450.0000334599.25400.2124090.1750.0473300.1990.0668150.2170.0102430.0380.59461.724.7465.670.1465.7810.025
Kawaruppu_sectionKRP072-z3178tuff0.3480.0000188398.55200.2312450.1120.0473700.3890.0668670.4170.0102420.0510.62363.709.2565.720.2765.7770.034
Kawaruppu_sectionKRP072-z6178tuff0.6190.0000186898.77250.1914620.1990.0473910.4990.0668910.5310.0102420.0590.60464.7611.8665.740.3465.7710.039
Kawaruppu_sectionKRP072-z4178tuff0.5090.0000279599.09330.2119810.1630.0472710.2410.0667170.2620.0102410.0420.59658.735.7465.580.1765.7670.027