Citation:

PANGAEA.994131

Name: Major element compositions of the sample series KWR4 from the Kawaruppu section
Published: 2026-05-19
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Cretaceous-Paleogene boundary; East Asia; IODP³; Osmium; zircon U-Pb geochronology

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

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Abstract:

This dataset contains major element compositions of the KWR4 sample series collected from the high-resolution interval of the Kawaruppu section, Nemuro Group, Hokkaido, Japan. These data were obtained to evaluate whether the osmium isotope ratios and platinum group element concentrations of the same samples were affected by diagenetic alteration. Major element compositions were measured by a RIGAKU ZSX Primus II X-ray fluorescence (XRF) spectrometer at Atmosphere and Ocean Research Institute (AORI), the University of Tokyo (Kashiwa).

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]

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Ota, Hayu
2	SECTION, height	Section	m	Ota, Hayu		Geocode – Stratigraphic levels are given in meters from the base of the Kawaruppu section, which is defined as 0 m.
3	Main Lithology	Main lith		Ota, Hayu
4	Sodium oxide	Na2O	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
5	Magnesium oxide	MgO	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
6	Aluminium oxide	Al2O3	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
7	Silicon dioxide	SiO2	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
8	Phosphorus pentoxide	P2O5	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
9	Potassium oxide	K2O	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
10	Calcium oxide	CaO	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
11	Titanium dioxide	TiO2	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
12	Chromium(III) oxide	Cr2O3	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
13	Manganese oxide	MnO	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
14	Iron oxide, Fe2O3	Fe2O3	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
15	Nickel oxide	NiO	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II	mass%
16	Loss on ignition	LOI	%	Ota, Hayu	X-ray fluorescence spectrometer (XRF), Rigaku Holdings Corporation, ZSX Primus II

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

105 data points

Data

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

1 Sample label	2 Section [m]	3 Main lith	4 Na2O [%]	5 MgO [%]	6 Al2O3 [%]	7 SiO2 [%]	8 P2O5 [%]	9 K2O [%]	10 CaO [%]	11 TiO2 [%]	12 Cr2O3 [%]	13 MnO [%]	14 Fe2O3 [%]	15 NiO [%]	16 LOI [%]
KWR4-01	173.00	mudstone	2.693	2.198	16.954	65.207	0.159	3.051	0.743	0.741	0.020	0.042	6.575	0.004	3.592
KWR4-03	173.20	mudstone	2.542	2.206	16.744	65.340	0.154	3.170	0.712	0.728	0.020	0.044	6.877	0.004	3.699
KWR4-04	173.30	mudstone	2.434	2.273	18.076	63.926	0.160	3.501	0.886	0.734	0.019	0.042	6.606	0.004	4.038
KWR4-04''	173.32	mudstone	2.405	2.249	17.704	63.675	0.154	3.416	0.898	0.707	0.020	0.041	6.873	0.005	4.152
KWR4-05	173.40	mudstone	2.514	2.189	17.014	64.904	0.154	3.231	0.758	0.760	0.021	0.038	6.673	0.004	3.827
KWR4-06	173.48	mudstone	2.539	2.207	17.129	64.972	0.157	3.269	0.741	0.762	0.023	0.040	6.623	0.004	3.769
KWR4-07	173.55	mudstone	2.774	2.194	17.303	64.429	0.162	3.211	0.747	0.767	0.021	0.041	6.705	0.003	3.800