/* DATA DESCRIPTION:
Citation:	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
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) (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: 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):	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)
	Thorium/Uranium ratio (Th/U) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Calculated * COMMENT: Model Th/U ratio iteratively calculated from the radiogenic 208Pb/206Pb ratio and 206Pb/238U age.
	Lead-206 [nmol] (206Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-206 [%] (206Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS) * COMMENT: mol %- radiogenic 206Pb with respect to radiogenic, blank and initial common Pb.
	Lead, radiogenic/Lead ratio (Pb rad/Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead [pg] (Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-206/Lead-204 ratio (206Pb/204Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-208/Lead-206 ratio (208Pb/206Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Lead-206 ratio (207Pb/206Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Lead-206 ratio, error, relative [%] (207Pb/206Pb e rel) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Uranium-235 ratio (207Pb/235U) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Uranium-235 ratio, error, relative [%] (207Pb/235U e rel) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-206/Uranium-238 ratio (206Pb/238U) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-206/Uranium-238 ratio, error, relative [%] (206Pb/238U e rel) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Correlation coefficient, isotope ratio error (Rho) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Lead-206 ratio (207Pb/206Pb) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Lead-206 ratio, error [±] (207Pb/206Pb e) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Uranium-235 ratio (207Pb/235U) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-207/Uranium-235 ratio, error [±] (207Pb/235U e) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-206/Uranium-238 ratio (206Pb/238U) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon U/Pb dating by chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS)
	Lead-206/Uranium-238 ratio, error [±] (206Pb/238U e) * PI: Schmitz, Mark D (https://orcid.org/0000-0003-2888-0321, markschmitz@boisestate.edu) * METHOD/DEVICE: Zircon 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) (URI: https://creativecommons.org/licenses/by/4.0/)
Status:	Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels)
Size:	132 data points
*/
Event	Sample label	Section [m] (Stratigraphic levels are give...)	Main lith	Th/U (Model Th/U ratio iteratively ...)	206Pb [nmol] (Zircon U/Pb dating by chemica...)	206Pb [%] (mol %- radiogenic 206Pb with ...)	Pb rad/Pb (Zircon U/Pb dating by chemica...)	Pb [pg] (Zircon U/Pb dating by chemica...)	206Pb/204Pb (Zircon U/Pb dating by chemica...)	208Pb/206Pb (Zircon U/Pb dating by chemica...)	207Pb/206Pb (Zircon U/Pb dating by chemica...)	207Pb/206Pb e rel [%] (Zircon U/Pb dating by chemica...)	207Pb/235U (Zircon U/Pb dating by chemica...)	207Pb/235U e rel [%] (Zircon U/Pb dating by chemica...)	206Pb/238U (Zircon U/Pb dating by chemica...)	206Pb/238U e rel [%] (Zircon U/Pb dating by chemica...)	Rho (Zircon U/Pb dating by chemica...)	207Pb/206Pb (Zircon U/Pb dating by chemica...)	207Pb/206Pb e [±] (Zircon U/Pb dating by chemica...)	207Pb/235U (Zircon U/Pb dating by chemica...)	207Pb/235U e [±] (Zircon U/Pb dating by chemica...)	206Pb/238U (Zircon U/Pb dating by chemica...)	206Pb/238U e [±] (Zircon U/Pb dating by chemica...)
Kawaruppu_section	KRP072-z5	178	tuff	0.394	0.00001791	98.79	24	0.18	1494	0.126	0.047428	0.380	0.067127	0.407	0.010270	0.050	0.619	66.62	9.03	65.97	0.26	65.952	0.033
Kawaruppu_section	KRP072-z1	178	tuff	0.517	0.00004301	98.88	27	0.40	1615	0.166	0.047380	0.263	0.066908	0.285	0.010247	0.043	0.596	64.21	6.26	65.76	0.18	65.804	0.028
Kawaruppu_section	KRP072-z2	178	tuff	0.545	0.00003345	99.25	40	0.21	2409	0.175	0.047330	0.199	0.066815	0.217	0.010243	0.038	0.594	61.72	4.74	65.67	0.14	65.781	0.025
Kawaruppu_section	KRP072-z3	178	tuff	0.348	0.00001883	98.55	20	0.23	1245	0.112	0.047370	0.389	0.066867	0.417	0.010242	0.051	0.623	63.70	9.25	65.72	0.27	65.777	0.034
Kawaruppu_section	KRP072-z6	178	tuff	0.619	0.00001868	98.77	25	0.19	1462	0.199	0.047391	0.499	0.066891	0.531	0.010242	0.059	0.604	64.76	11.86	65.74	0.34	65.771	0.039
Kawaruppu_section	KRP072-z4	178	tuff	0.509	0.00002795	99.09	33	0.21	1981	0.163	0.047271	0.241	0.066717	0.262	0.010241	0.042	0.596	58.73	5.74	65.58	0.17	65.767	0.027