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Ota, Hayu; Kuroda, Junichiro; Orihashi, Yuji; Schmitz, Mark D; Takashima, Reishi (2026): Low-resolution osmium and rhenium concentrations from mudstone samples of the Kawaruppu section [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.994127

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

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Abstract:
This dataset contains osmium isotope ratios and osmium and rhenium concentrations from mudstone samples collected from the low-resolution interval of the Kawaruppu section, Nemuro Group, Hokkaido, Japan. The data cover the Upper Cretaceous-lower Paleogene interval across the Cretaceous-Paleogene boundary and were compiled for an integrated stratigraphic investigation of the boundary interval. Osmium isotope ratios and Os concentrations were measured by negative thermal ionization mass spectrometry (N-TIMS; TRITON, Thermo Fisher Scientific) and rhenium concentrations were measured by inductively coupled plasma quadrupole mass spectrometry (ICP-QMS; iCAP Q, ThermoFisher Scientific) at Japan Agency for Marine-Earth Science and Technology (JAMSTEC).
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: 35.4 m * Maximum SECTION, height: 194.3 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 OsmiumOspg/gOta, HayuNegative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT
6 Osmium, standard deviationOs std dev±Ota, HayuNegative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT1-sigma
7 RheniumRepg/gOta, HayuInductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP TQ
8 Rhenium, standard deviationRe std dev±Ota, HayuInductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP TQ1-sigma
9 Osmium-187/Osmium-188 ratio187Os/188OsOta, HayuNegative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT
10 Osmium-187/Osmium-188 ratio, standard deviation187Os/188Os std dev±Ota, HayuNegative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT1-sigma
11 Osmium-187/Osmium-188 ratio187Os/188OsOta, HayuCorrected, using the 187Os/188Os ratios for in situ decay of 187ReInitial
12 Osmium-187/Osmium-188 ratio, standard deviation187Os/188Os std dev±Ota, HayuCorrected, using the 187Os/188Os ratios for in situ decay of 187ReInitial, 1-sigma
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
244 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 
Os [pg/g]
(Negative-thermal ionization m...)		6 
Os std dev [±]
(1-sigma, Negative-thermal ion...)		7 
Re [pg/g]
(Inductively coupled plasma ma...)		8 
Re std dev [±]
(1-sigma, Inductively coupled ...)		9 
187Os/188Os
(Negative-thermal ionization m...)		10 
187Os/188Os std dev [±]
(1-sigma, Negative-thermal ion...)		11 
187Os/188Os
(Initial, Corrected, using the...)		12 
187Os/188Os std dev [±]
(Initial, 1-sigma, Corrected, ...)
Kawaruppu_section KW312194.3mudstone74.50.52185100.6110.0110.4460.011
Kawaruppu_sectionKW309191.6mudstone72.20.62639160.6560.0110.4490.011
Kawaruppu_sectionKW301184.6mudstone68.50.52907200.6820.0120.4410.012
Kawaruppu_sectionKW-295178.8mudstone121.51.134331610.6050.0110.4460.014
Kawaruppu_sectionKW289173.1mudstone126.31.02481110.4020.0100.2940.010
Kawaruppu_sectionKW289-2173.1mudstone257620
Kawaruppu_sectionKW289-3173.1mudstone87.70.6262880.5960.0090.4280.009
Kawaruppu_sectionKW289-4173.1mudstone93.60.42716140.5630.0040.4000.005
Kawaruppu_sectionKW282165.9mudstone54.30.497770.6990.0140.5960.014
Kawaruppu_sectionKW279162.0mudstone60.60.5989110.7080.0150.6150.015
Kawaruppu_sectionKW275158.7mudstone64.00.5131880.7000.0170.5830.017
Kawaruppu_sectionKW269152.5mudstone57.10.475560.6940.0130.6190.013
Kawaruppu_sectionKW264147.4mudstone86.10.61015140.5780.0100.5120.010
Kawaruppu_sectionKW246141.7mudstone60.90.666440.6710.0170.6090.017
Kawaruppu_sectionKW240135.0mudstone60.90.356650.6340.0090.5820.009
Kawaruppu_sectionKW234128.3mudstone61.90.459770.6610.0120.6060.012
Kawaruppu_sectionKW218111.4mudstone90.11.079170.6260.0150.5770.015
Kawaruppu_sectionKW20798.9mudstone63.40.8631290.6780.0300.6220.030
Kawaruppu_sectionKW200-191.2mudstone68.00.7616250.6770.0170.6250.017
Kawaruppu_sectionKW200-391.2mudstone69.91.6714300.6730.0440.6150.044
Kawaruppu_sectionKW19487.1mudstone74.00.8800110.6540.0190.5930.019
Kawaruppu_sectionKW18075.1mudstone85.11.072090.6010.0190.5530.019
Kawaruppu_sectionKW17064.9mudstone72.90.5100740.6840.0100.6050.010
Kawaruppu_sectionKW15851.6mudstone90.70.81115150.6380.0150.5690.015
Kawaruppu_sectionKW14335.4mudstone75.63.41000100.6400.0800.5660.080