/* DATA DESCRIPTION:
Citation:	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
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) (URI: https://www.jsps.go.jp/english/), grant/award no. 17K05674: High resolution age model and paleoenvironmental change for K/Pg boundary (URI: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17K05674/)
	Japan Society for the Promotion of Science (JSPS) (URI: https://www.jsps.go.jp/english/), grant/award no. 18KK0091: Improvement of Cretaceous Geologic Time Scale (URI: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-18KK0091)
	Japan Society for the Promotion of Science (JSPS) (URI: https://www.jsps.go.jp/english/), 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 (URI: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21H04503)
	Japan Society for the Promotion of Science (JSPS) (URI: https://www.jsps.go.jp/english/), grant/award no. 22H01342: The Cretaceous-Paleogene Boundary in the Southern Hemisphere: Osmium isotopic record to fingerprint flood basalt volcanism (URI: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-23K22613/)
	Japan Society for the Promotion of Science (JSPS) (URI: https://www.jsps.go.jp/english/), grant/award no. 22K18426: Linkage of the Earth's tipping points and the subseafloor biosphere (URI: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22K18426/)
	Japan Society for the Promotion of Science (JSPS) (URI: https://www.jsps.go.jp/english/), grant/award no. 23H00153: Analysis of internal Earth nitrogen using pupulin nitrogen isotope ratio (URI: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-23H00153/)
	Japan Society for the Promotion of Science (JSPS) (URI: https://www.jsps.go.jp/english/), grant/award no. JPJSCCA20250004: Warm-period Climate Change Research Center with the International Ocean Drilling School [WarmCCR] (URI: https://sites.google.com/view/kochi-jsps-core2core/english?authuser=0)
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):	Event label (Event) * PI: Takashima, Reishi (https://orcid.org/0000-0003-1830-6887, reishi.takashima.a7@tohoku.ac.jp)
	Sample code/label (Sample label) * PI: Takashima, Reishi (https://orcid.org/0000-0003-1830-6887, reishi.takashima.a7@tohoku.ac.jp)
	SECTION, height [m] (Section) * GEOCODE * PI: Takashima, Reishi (https://orcid.org/0000-0003-1830-6887, reishi.takashima.a7@tohoku.ac.jp) * COMMENT: Stratigraphic levels are given in meters from the base of the Kawaruppu section, which is defined as 0 m.
	Main Lithology (Main lith) * PI: Takashima, Reishi (https://orcid.org/0000-0003-1830-6887, reishi.takashima.a7@tohoku.ac.jp)
	Osmium [pg/g] (Os) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Negative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT
	Osmium, standard deviation [±] (Os std dev) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Negative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT * COMMENT: 1-sigma
	Rhenium [pg/g] (Re) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP TQ
	Rhenium, standard deviation [±] (Re std dev) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP TQ * COMMENT: 1-sigma
	Osmium-187/Osmium-188 ratio (187Os/188Os) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Negative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT
	Osmium-187/Osmium-188 ratio, standard deviation [±] (187Os/188Os std dev) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Negative-thermal ionization mass spectrometer (N-TIMS), Thermo Fisher Scientific, TRITON XT * COMMENT: 1-sigma
	Osmium-187/Osmium-188 ratio (187Os/188Os) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Corrected, using the 187Os/188Os ratios for in situ decay of 187Re * COMMENT: Initial
	Osmium-187/Osmium-188 ratio, standard deviation [±] (187Os/188Os std dev) * PI: Ota, Hayu (https://orcid.org/0009-0001-7029-2067, h-ota@g.ecc.u-tokyo.ac.jp) * METHOD/DEVICE: Corrected, using the 187Os/188Os ratios for in situ decay of 187Re * COMMENT: Initial, 1-sigma
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Status:	Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels)
Size:	244 data points
*/
Event	Sample label	Section [m] (Stratigraphic levels are give...)	Main lith	Os [pg/g] (Negative-thermal ionization m...)	Os std dev [±] (1-sigma, Negative-thermal ion...)	Re [pg/g] (Inductively coupled plasma ma...)	Re std dev [±] (1-sigma, Inductively coupled ...)	187Os/188Os (Negative-thermal ionization m...)	187Os/188Os std dev [±] (1-sigma, Negative-thermal ion...)	187Os/188Os (Initial, Corrected, using the...)	187Os/188Os std dev [±] (Initial, 1-sigma, Corrected, ...)
Kawaruppu_section	KW312	194.3	mudstone	74.5	0.5	2185	10	0.611	0.011	0.446	0.011
Kawaruppu_section	KW309	191.6	mudstone	72.2	0.6	2639	16	0.656	0.011	0.449	0.011
Kawaruppu_section	KW301	184.6	mudstone	68.5	0.5	2907	20	0.682	0.012	0.441	0.012
Kawaruppu_section	KW-295	178.8	mudstone	121.5	1.1	3433	161	0.605	0.011	0.446	0.014
Kawaruppu_section	KW289	173.1	mudstone	126.3	1.0	2481	11	0.402	0.010	0.294	0.010
Kawaruppu_section	KW289-2	173.1	mudstone			2576	20				
Kawaruppu_section	KW289-3	173.1	mudstone	87.7	0.6	2628	8	0.596	0.009	0.428	0.009
Kawaruppu_section	KW289-4	173.1	mudstone	93.6	0.4	2716	14	0.563	0.004	0.400	0.005
Kawaruppu_section	KW282	165.9	mudstone	54.3	0.4	977	7	0.699	0.014	0.596	0.014
Kawaruppu_section	KW279	162.0	mudstone	60.6	0.5	989	11	0.708	0.015	0.615	0.015
Kawaruppu_section	KW275	158.7	mudstone	64.0	0.5	1318	8	0.700	0.017	0.583	0.017
Kawaruppu_section	KW269	152.5	mudstone	57.1	0.4	755	6	0.694	0.013	0.619	0.013
Kawaruppu_section	KW264	147.4	mudstone	86.1	0.6	1015	14	0.578	0.010	0.512	0.010
Kawaruppu_section	KW246	141.7	mudstone	60.9	0.6	664	4	0.671	0.017	0.609	0.017
Kawaruppu_section	KW240	135.0	mudstone	60.9	0.3	566	5	0.634	0.009	0.582	0.009
Kawaruppu_section	KW234	128.3	mudstone	61.9	0.4	597	7	0.661	0.012	0.606	0.012
Kawaruppu_section	KW218	111.4	mudstone	90.1	1.0	791	7	0.626	0.015	0.577	0.015
Kawaruppu_section	KW207	98.9	mudstone	63.4	0.8	631	29	0.678	0.030	0.622	0.030
Kawaruppu_section	KW200-1	91.2	mudstone	68.0	0.7	616	25	0.677	0.017	0.625	0.017
Kawaruppu_section	KW200-3	91.2	mudstone	69.9	1.6	714	30	0.673	0.044	0.615	0.044
Kawaruppu_section	KW194	87.1	mudstone	74.0	0.8	800	11	0.654	0.019	0.593	0.019
Kawaruppu_section	KW180	75.1	mudstone	85.1	1.0	720	9	0.601	0.019	0.553	0.019
Kawaruppu_section	KW170	64.9	mudstone	72.9	0.5	1007	4	0.684	0.010	0.605	0.010
Kawaruppu_section	KW158	51.6	mudstone	90.7	0.8	1115	15	0.638	0.015	0.569	0.015
Kawaruppu_section	KW143	35.4	mudstone	75.6	3.4	1000	10	0.640	0.080	0.566	0.080