Geotechnical behavior of mudstones from the Shimanto and Boso accretionary complexes, and implications for the Nankai accretionary prism

Earth, Planets and Space

Table 4 Mineralogical compositions of the three sample subsets

	Sample	Quartz	Feldspar	Calcite	Muscovite	Total clay	Clay + mica	Qtz + fsp	Reference
Boso	NZ-PS-1	27	15	3		54	54	42	Kameda et al. (2010) This study
	NZ-PS-2	28	15	3		54	54	42
	NZ-PS-2	20.1	32.9	3.9	4.7	38.1	42.8	53
	NZ-PS-4	28	10	6		56	56	38
	NZ-PS-5	31	9	0		60	60	40
Shimanto Belt	Sch2011/23	41.8	19.9		14.7	23.2	37.9	61.7	This study
	Sch2011/24	30.5	17.5		10.7	41.1	51.8	48.0
	Sch2011/27	51.6	17.8		8.58	21.8	30.3	69.4
	Sch2011/29	42.1	19.8		6.2	31.5	37.7	61.9
	Sch2011/18	35.0	32.3		13.2	19.2	32.4	67.3
	Sch2011/34	38.8	21.9		16.4	22.7	39.1	60.7
	Sch2011/8	46.0	23.9		14.7	14.9	29.6	70.8
	Sch2011/12	36.5	14.8		12.7	35.7	48.4	51.3
Nankai	K004	39.2	20.1	14.1		39.2		59.3	Schumann et al. (2014)
	K005	20.6	12.9	16.8		49.4		33.5
	K011	No data
	K013	No data
	K014	31.2	25.6	6.6		36.3		56.8
	K015	34.7	25.6	5.1		34.4		60.3
	K016	38.1	31.8	0.1		29.7		69.9
	K020	No data
	K022	28.3	29.8	6.6		35.1		58.1

The composition of sample NZ-PS-2 was determined by X-ray powder diffraction (XRD) in this study. The composition of the samples from the Shimanto Belt and from Nankai was determined by synchrotron X-ray diffraction-based Rietveld refinement (Rietveld 1969). Mineral contents are given in weight percent. qtz, quartz; fsp, feldspar; mica, muscovite.