Table T10. Summary of volcanic textures.

Table T10. Summary of volcanic textures.


Core, section	Interval (cm)	Piece	Unit	Plagioclase mode (%)	Phenocryst size (mm)	Olivine mode (%)	Phenocryst size (mm)	Unaltered olivine	Grain size	Crystallinity	Vesicularity	Segregation structures	Notes/interpretation
196-1173B-
1R-1 (737.1 mbsf)*	35-39.5	8A	1	5	0.5-5.0	<0.5	<1		mc	hc	nv (<1%)	sv	Variolitic domains, close to a upper lobe boundary
	39.5-42	9A											Variolitic domains
	42-46.5	10A									spv	sv	Variolitic domains
	46.5-51	11A									nv		Variolitic domains
	51-55	12A
	55-58	13A							mc/fg	c
	58-65	14A
	65-71	15A
	71-74.5	16A
	74.5-80	17A				<2	<1.5
	80-84	18A							mc	hc			Variolitic domains
	84-94	19A							mc/cc	hc/hy	spv (3%)		Variolitic texture and boundary: 3-mm-thick silicified glassy selvage with relict domains of varioles (= quenched lobe margins)
	94-98	20A							mc	hyh/hc	nv
	98-102	21A
	102-106	22A							mc	hc	spv (3%)
	106-116.5	23A							fg/mc	c	nv/spv		Amygdales contain secondary pyrite
	116.5-124.5	24A											Secondary pyrite lining the inner walls of vesicles
	124.5-133	25A							mc
	133-139	26A
	139-148	27A				2-3
1R-2 (738.58 mbsf)*	1-11	1A	1	7	0.5-5.0	<2	0.3-2.0		fg	c	spv
	11-16.5	2A							mc				Variolitic domains
	16.5-24	3A											Variolitic domains
	24-31	4A							mc	hc/hyh/G			Variolitic texture and boundary: 5-mm-thick silicified glassy selvage with relict domains of varioles (= quenched lobe margins)
	31-36	5A							mc	hc/c	nv		Variolitic domains
	36-40	6A									spv		Variolitic domains
	40-45	7A							mc	hyh/G			Variolitic texture and boundary: 5-mm-thick silicified glassy selvage with relict domains of varioles (= quenched lobe margins)
	45-49	8A							mc	hyh/hc	spv		Variolitic domains
	49-57	9A								hc/c
	57-68	10A									nv
	68-78	11A							mc	hc/hyh	spv (3%-5%)		Variolitic domains; close to lobe margins?
	78-88	12A							mc	hc/c	spv
	88-95	13A
	95-100.5	14A									nv
	100.5-112.5	15A							fg/mc	c
	112.5-118.5	16A
	118.5-125	17A							mc	hc	spv		Variolitic domains; close to lobe margins?
	125-132	18A							mc	hc	spv		Variolitic domains
	132-140	19A
	140-146	20A									nv
	146-150	21A									spv
2R-1 (746.8 mbsf)^†	0-5	1A	1	5	0.5-4.0				mc	hc/c	spv		Variolitic domains; close to lobe margins?
	5-8	2A									spv/mov
	8-19.5	3A								c	mov
	19.5-53	4A								c	spv
	53-63	5A								hc/hyh	spv		Variolitic domains; close to lobe margins?
	63-69	6A							mc/fg	c	spv/mov

3R-1 (751.7 mbsf)^‡	0-11	1A	2	10	0.5-5.0	2-3	0.2-2	ol	fg	c	nv (<1%)		Variolitic domains
	11-19	2A											Variolitic domains
	19-22	3A							mc	hc/G	spv/mi		Variolitic texture and boundary: 5-mm-thick silicified glassy selvage with relict domains of varioles (= quenched lobe margins)
	22-25	4A								c	spv
	25-28	5A								c/hc	spv/mov		Close to boundary: fining of grain size and dominance of variolitic texture in groundmass
	28-32.5	6A						ol			nv
	32.5-36.5	7A								hc	spv		Close to boundary: fining of grain size and dominance of variolitic texture in groundmass
	36.5-40	8A						ol			nv
	40-43	9A											Variolitic domains
	43-55	10A									spv (3%)		Variolitic domains
	55-63.5	11A				1-3					spv (3%-5%)		Variolitic domains
	63.5-88	12A							mc/cc	hc/hy	spv		Close to boundary: fining of grain size and dominance of variolitic texture in groundmass
	88-95	12C							mc/fg	c
	95-98	13A							mc/cc	hc/hy	nv		Close to boundary: fining of grain size and dominance of variolitic texture in groundmass
	98-105	14A							mc	hc	spv (3%)
	105-110.5	15A							mc/cc	hy/G	nv		Variolitic texture and boundary: 3-mm-thick silicified glassy selvage with relict domains of varioles (= quenched lobe margins)
	110.5-116	16A							mc/cc	hc/hy	nv		Variolitic texture and boundary: 3-mm-thick silicified glassy selvage with relict domains of varioles (= quenched lobe margins)
	116-128	17A						ol	mc	hc	spv (3%)
	128-132.5	18A						ol	mc	hc	spv (3%)
	132.5-144.5	19A				2-3			mc	hc	nv		Variolitic groundmass texture
	144.5-149.5	20A				2-3			mc	hc	nv		Variolitic groundmass texture; approaching a boundary?
3R-2 (753.2 mbsf)^‡	0-3	1A	2	10	0.5-5.0	2-4	0.2-2		mc	c/hc	spv
	3-6	2A											Variolitic texture
	6-20	3A							mc	hc/hy	spv		Variolitic texture
	20-23	4A							mc/cc	hc/G	spv		Variolitic texture and boundary: 3-mm-thick silicified glassy selvage with relict domains of varioles (= quenched lobe margins)
	23-29	5A							mc	hc/c	nv		Variolitic texture
	29-32.5	6A								hc
	32.5-36	7A											Variolitic texture
	36-45.5	8A								hc/hy	spv (2%)		Variolitic texture
	45.5-52.5	9A									nv		Variolitic domains
	52.5-56.5	10A							cc/mc	hy			Close to boundary: fining of grain size and dominance of variolitic texture in groundmass
	56.5-62	11A							mc	hc	nv		Close to boundary: fining of grain size and dominance of variolitic texture in groundmass
	62-65	12A											Variolitic texture
	65-76	13A							mc/cc/G	hc/hy	nv/spv		Variolitic texture and boundary: 2-mm-thick glassy rind with film of vitric tuff adhering to surface (= quenched lobe margins)
	76-86	14A							mc	hc	spv (3%-5%)

Notes: * = Sparsely to moderately plagioclase-olivine-phyric basalt (groundmass texture is intergranular with plagioclase needles and interstitial feathery pyroxene, unless specified otherwise); † = Sparsely to moderately plagioclase-phyric basalt (groundmass texture is intergranular with plagioclase needles and interstitial feathery pyroxene, unless specified otherwise), ‡ = Moderately plagioclase-olivine phyric basalt (groundmass texture is intergranular with plagioclase needles and interstitial feathery pyroxene, unless specified otherwise). Abbreviations: see Figure F12 in the "Explanatory Notes" chapter for definitions.