Citation:

PANGAEA.969334

Name: Point-count analyses of grains from the Nankai subduction zone (Japan) at IODP Site 348-C0002
Published: 2024-06-27
License: https://creativecommons.org/licenses/by/4.0/
Keywords: deep-marine sediments; petrography analysis; zircon age dating

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Published: 2024-06-27 • DOI registered: 2024-06-27

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Abstract:

For petrographic analyses, point counting was used to quantitatively estimate the modal composition of sand and sandstones by totalling the occurrence of various mineral grains within a representative sample. The Gazzi-Dickinson methos was chosen for this study. A total of 80 cutting and core samples from IODP Expedition 348 were used for this study, covering a total depth transect from 1,140.5-3,000.5 mbsf of the Nankai Accretionary Prism (SW Japan) at sites C0002N and C0002P. All 80 samples were prepared for thin sections for quantitative modal compositional analysis at The Open University (United Kingdom). Samples were sieved to remove clay and silt from the unconsolidated material. Approximately 10 grams of sands were then separated from the sieved samples and mixed with epoxy. The epoxy grain mounts were sliced to thin section thickness, cemented to glass slides with epoxy resin, and then thin sections were completed in the usual method. Point-count analyses involved 400 points per sample. Each grain was assigned to a classification category (e.g., monocrystalline quartz, polycrystalline quartz, feldspar, volcanic lithic, sedimentary lithics, etc).

Keyword(s):

deep-marine sediments; petrography analysis; zircon age dating

Supplement to:

Cornard, Pauline; Dawson, H L; Pickering, K T (2024): Sediment Provenance Along the Middle Miocene-Pleistocene Nankai Subduction Zone From Sediment Transport to Accretion: Implications for Stratigraphy in the Accretionary Prism. Geochemistry, Geophysics, Geosystems, 25(8), e2023GC011393, https://doi.org/10.1029/2023GC011393

Funding:

Natural Environment Research Council (NERC), grant/award no. NE/S016295/1 : Provenance of sediments from IODP Expedition 358, (NanTroSEIZE Deep Riser Drilling: Nankai Seismogenic / Slow Slip Megathrust)

Coverage:

Latitude: 33.440832 * Longitude: 137.196942

Minimum DEPTH, sediment/rock: 1145.50 m * Maximum DEPTH, sediment/rock: 2995.50 m

Event(s):

348-C0002N * Latitude: 33.440830 * Longitude: 137.196940 * Elevation: -1939.0 m * Location: Nankai Trough * Campaign: (NanTroSEIZE Plate Boundary Drilling 3) * Basis: * Method/Device: Drilling/drill rig (DRILL)

348-C0002P * Latitude: 33.440833 * Longitude: 137.196944 * Elevation: -1939.0 m * Recovery: 31.5 m * Location: Nankai Trough * Campaign: (NanTroSEIZE Plate Boundary Drilling 3) * Basis: * Method/Device: Drilling/drill rig (DRILL)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Cornard, Pauline
2	Latitude of event	Latitude		Cornard, Pauline
3	Longitude of event	Longitude		Cornard, Pauline
4	Sample code/label	Sample label		Cornard, Pauline		Solid taken from drilling mud (cuttings) [SMW]
5	Sample ID	Sample ID		Cornard, Pauline
6	DEPTH, sediment/rock	Depth sed	m	Cornard, Pauline		Geocode – Meter below seafloor (mbsf)
7	Quartz, monocrystalline	MonoQz	#	Cornard, Pauline	Counted	>0.625 mm
8	Quartz, polycrystalline	PolyQz	#	Cornard, Pauline	Counted	Mainly chert
9	Feldspar	Fsp	#	Cornard, Pauline	Counted
10	Lithic grains, sedimentary	Lithic sedi	#	Cornard, Pauline	Counted
11	Lithic grains, volcanic	Lithic volc	#	Cornard, Pauline	Counted
12	Mica, grains	Mica grains	#	Cornard, Pauline	Counted
13	Minerals, accessory	Min acc	#	Cornard, Pauline	Counted
14	Clay minerals	Clay min	#	Cornard, Pauline	Counted
15	Nannofossils	Nannos	#	Cornard, Pauline	Counted
16	Fossils	Fossils	#	Cornard, Pauline	Counted
17	Organic matter	OM	#	Cornard, Pauline	Counted
18	Clinopyroxene	Cpx	#	Cornard, Pauline	Counted
19	Clinopyroxene	Cpx	#	Cornard, Pauline	Counted

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

1200 data points

Data

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

1 Event	2 Latitude	3 Longitude	4 Sample label (Solid taken from drilling mud...)	5 Sample ID	6 Depth sed [m] (Meter below seafloor (mbsf))	7 MonoQz [#] (>0.625 mm)	8 PolyQz [#] (Mainly chert)	9 Fsp [#]	10 Lithic sedi [#]	11 Lithic volc [#]	12 Mica grains [#]	13 Min acc [#]	14 Clay min [#]	15 Nannos [#]	16 Fossils [#]	17 OM [#]	18 Cpx [#]	19 Cpx [#]
348-C0002N	33.4408	137.1969	348-C0002N-59-SMW	CKY 0000 0000 0006 5301 00	1145.50	118	5	69	38	19	39	4	12	19	1	51	25	400
348-C0002N	33.4408	137.1969	348-C0002N-63-SMW	CKY 0000 0000 0006 5273 00	1165.50	100	5	103	8	20	68	22	8	10	0	27	29	400
348-C0002N	33.4408	137.1969	348-C0002N-67-SMW	CKY 0000 0000 0006 5274 00	1185.50	96	1	109	11	40	43	36	14	0	1	23	26	400
348-C0002N	33.4408	137.1969	348-C0002N-71-SMW	CKY 0000 0000 0006 5275 00	1205.50	88	6	114	15	30	21	30	19	2	0	47	28	400
348-C0002N	33.4408	137.1969	348-C0002N-83-SMW	CKY 0000 0000 0006 5276 00	1235.50	83	4	124	12	26	40	36	18	0	0	29	28	400
348-C0002N	33.4408	137.1969	348-C0002N-87-SMW	CKY 0000 0000 0006 5277 00	1255.50	73	0	137	20	7	56	27	13	0	4	43	20	400
348-C0002N	33.4408	137.1969	348-C0002N-91-SMW	CKY 0000 0000 0006 5278 00	1275.50	71	7	149	39	27	35	9	11	2	1	23	26	400
348-C0002N	33.4408	137.1969	348-C0002N-95-SMW	CKY 0000 0000 0006 5279 00	1295.50	70	8	179	19	12	26	23	16	3	0	20	24	400
348-C0002N	33.4408	137.1969	348-C0002N-99-SMW	CKY 0000 0000 0006 5280 00	1315.50	73	10	166	18	23	24	15	20	1	0	26	24	400
348-C0002N	33.4408	137.1969	348-C0002N-105-SMW	CKY 0000 0000 0006 5281 00	1335.50	81	4	167	23	43	20	9	7	3	4	18	21	400
348-C0002N	33.4408	137.1969	348-C0002N-109-SMW	CKY 0000 0000 0006 5282 00	1355.50	91	8	146	20	48	23	10	10	4	1	26	13	400
348-C0002N	33.4408	137.1969	348-C0002N-113-SMW	CKY 0000 0000 0006 5283 00	1375.50	121	7	109	18	65	6	12	10	4	0	32	16	400
348-C0002N	33.4408	137.1969	348-C0002N-117-SMW	CKY 0000 0000 0006 5284 00	1395.50	80	12	169	21	27	17	18	2	13	1	22	18	400
348-C0002N	33.4408	137.1969	348-C0002N-121-SMW	CKY 0000 0000 0006 5285 00	1415.50	99	4	157	36	26	20	7	15	1	1	23	11	400
348-C0002N	33.4408	137.1969	348-C0002N-125-SMW	CKY 0000 0000 0006 5286 00	1435.50	140	8	132	6	18	15	13	13	4	1	38	12	400
348-C0002N	33.4408	137.1969	348-C0002N-130-SMW	CKY 0000 0000 0006 5287 00	1455.50	112	21	134	7	26	19	9	15	11	1	37	8	400
348-C0002N	33.4408	137.1969	348-C0002N-134-SMW	CKY 0000 0000 0006 5288 00	1475.50	119	8	147	1	37	16	10	16	4	1	32	9	400
348-C0002N	33.4408	137.1969	348-C0002N-138-SMW	CKY 0000 0000 0006 5289 00	1495.50	102	36	139	8	45	17	11	11	3	0	23	5	400
348-C0002N	33.4408	137.1969	348-C0002N-142-SMW	CKY 0000 0000 0006 5290 00	1515.50	108	13	129	17	21	20	25	8	3	4	42	10	400
348-C0002N	33.4408	137.1969	348-C0002N-148-SMW	CKY 0000 0000 0006 5291 00	1535.50	81	36	143	26	38	23	11	10	1	0	22	9	400
348-C0002N	33.4408	137.1969	348-C0002N-152-SMW	CKY 0000 0000 0006 5292 00	1555.50	116	3	138	14	34	19	10	20	0	3	37	6	400
348-C0002N	33.4408	137.1969	348-C0002N-156-SMW	CKY 0000 0000 0006 5293 00	1575.50	108	54	120	12	28	12	11	15	3	1	31	5	400
348-C0002N	33.4408	137.1969	348-C0002N-160-SMW	CKY 0000 0000 0006 5294 00	1595.50	102	62	95	19	28	11	16	20	2	0	36	9	400
348-C0002N	33.4408	137.1969	348-C0002N-164-SMW	CKY 0000 0000 0006 5295 00	1615.50	131	45	106	19	31	11	9	11	2	2	26	7	400
348-C0002N	33.4408	137.1969	348-C0002N-169-SMW	CKY 0000 0000 0006 5296 00	1635.50	121	37	100	0	41	16	11	24	5	1	37	7	400
348-C0002N	33.4408	137.1969	348-C0002N-173-SMW	CKY 0000 0000 0006 5297 00	1655.50	126	77	99	6	31	9	15	20	0	0	14	3	400
348-C0002N	33.4408	137.1969	348-C0002N-177-SMW	CKY 0000 0000 0006 5298 00	1677.50	128	49	91	15	42	8	19	17	0	0	28	3	400
348-C0002N	33.4408	137.1969	348-C0002N-184-SMW	CKY 0000 0000 0006 5985 00	1695.50	139	22	125	6	36	11	16	22	0	0	21	2	400
348-C0002N	33.4408	137.1969	348-C0002N-261-SMW	CKY 0000 0000 0006 5299 00	2025.50	149	17	110	7	30	18	13	27	1	0	24	4	400
348-C0002N	33.4408	137.1969	348-C0002N-266-SMW	CKY 0000 0000 0006 5311 00	2045.50	139	2	93	12	35	14	24	41	1	2	36	1	400
348-C0002N	33.4408	137.1969	348-C0002N-270-SMW	CKY 0000 0000 0006 5312 00	2065.50	166	6	116	3	35	14	8	28	2	0	17	5	400
348-C0002N	33.4408	137.1969	348-C0002N-274-SMW	CKY 0000 0000 0006 5313 00	2085.50	155	22	118	9	28	15	23	15	2	0	11	2	400
348-C0002N	33.4408	137.1969	348-C0002N-278-SMW	CKY 0000 0000 0006 5314 00	2105.50	137	34	113	8	32	13	17	24	0	0	20	2	400
348-C0002N	33.4408	137.1969	348-C0002N-283-SMW	CKY 0000 0000 0006 5315 00	2125.50	143	14	126	14	29	7	16	24	0	0	26	1	400
348-C0002N	33.4408	137.1969	348-C0002N-287-SMW	CKY 0000 0000 0006 5316 00	2145.50	146	17	120	2	19	9	17	38	0	0	29	3	400
348-C0002P	33.4408	137.1969	348-C0002P-61-SMW	CKY 0000 0000 0006 5348 00	2145.50	151	15	126	14	29	6	18	25	0	0	14	2	400
348-C0002P	33.4408	137.1969	348-C0002P-71-SMW	CKY 0000 0000 0006 5349 00	2165.50	117	58	92	29	40	9	8	28	1	0	12	6	400
348-C0002P	33.4408	137.1969	348-C0002P-1R-CC	CKY 0000 0000 0006 5262 00	2163.36	135	26	101	4	20	17	20	29	0	0	48	0	400
348-C0002P	33.4408	137.1969	348-C0002P-2R-1	CKY 0000 0000 0006 5265 00	2172.68	112	52	90	42	24	10	14	36	0	4	15	1	400
348-C0002P	33.4408	137.1969	348-C0002P-2R-1	CKY 0000 0000 0006 5264 00	2173.46	116	53	91	3	10	23	15	55	0	0	29	5	400
348-C0002P	33.4408	137.1969	348-C0002P-2R-1	CKY 0000 0000 0006 5263 00	2173.85	125	48	98	0	17	18	9	55	0	0	28	2	400
348-C0002P	33.4408	137.1969	348-C0002P-2R-3	CKY 0000 0000 0006 5266 00	2175.32	130	66	96	0	27	14	19	34	0	0	13	1	400
348-C0002P	33.4408	137.1969	348-C0002P-2R-3	CKY 0000 0000 0006 5267 00	2175.72	128	99	104	6	24	18	1	9	0	0	10	1	400
348-C0002P	33.4408	137.1969	348-C0002P-2R-4	CKY 0000 0000 0006 5268 00	2176.88	149	43	95	17	28	12	9	28	0	0	19	0	400
348-C0002P	33.4408	137.1969	348-C0002P-76-SMW	CKY 0000 0000 0006 5350 00	2185.50	152	62	94	11	20	14	8	13	0	3	23	0	400
348-C0002P	33.4408	137.1969	348-C0002P-81-SMW	CKY 0000 0000 0006 5351 00	2195.50	135	60	96	3	31	7	20	27	0	0	21	0	400
348-C0002P	33.4408	137.1969	348-C0002P-4R-1	CKY 0000 0000 0006 5269 00	2192.31	131	98	96	0	12	14	4	36	0	0	9	0	400
348-C0002P	33.4408	137.1969	348-C0002P-4R-4	CKY 0000 0000 0006 5270 00	2195.97	126	98	102	2	19	11	10	14	0	0	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-4R-6	CKY 0000 0000 0006 5271 00	2198.76	132	95	85	0	12	17	7	32	0	0	20	0	400
348-C0002P	33.4408	137.1969	348-C0002P-4R-6	CKY 0000 0000 0006 5272 00	2199.76	134	80	84	2	32	12	11	24	0	0	21	0	400
348-C0002P	33.4408	137.1969	348-C0002P-86-SMW	CKY 0000 0000 0006 5352 00	2215.50	136	57	103	22	22	5	18	18	0	1	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-109-SMW	CKY 0000 0000 0006 5386 00	2235.50	132	67	92	17	23	15	17	8	2	1	26	0	400
348-C0002P	33.4408	137.1969	348-C0002P-113-SMW	CKY 0000 0000 0006 5353 00	2255.50	138	56	111	15	10	9	12	24	0	1	23	1	400
348-C0002P	33.4408	137.1969	348-C0002P-117-SMW	CKY 0000 0000 0006 5354 00	2275.50	128	64	106	17	14	12	17	14	0	2	26	0	400
348-C0002P	33.4408	137.1969	348-C0002P-123-SMW	CKY 0000 0000 0006 5355 00	2295.50	143	72	88	7	11	8	22	25	0	0	24	0	400
348-C0002P	33.4408	137.1969	348-C0002P-127-SMW	CKY 0000 0000 0006 5356 00	2315.50	138	71	93	18	18	4	11	26	0	0	21	0	400
348-C0002P	33.4408	137.1969	348-C0002P-131-SMW	CKY 0000 0000 0006 5357 00	2335.50	134	63	106	14	27	15	8	17	0	0	16	0	400
348-C0002P	33.4408	137.1969	348-C0002P-136-SMW	CKY 0000 0000 0006 5358 00	2355.50	124	71	103	2	13	17	14	34	0	0	22	0	400
348-C0002P	33.4408	137.1969	348-C0002P-141-SMW	CKY 0000 0000 0006 5359 00	2375.50	136	71	96	15	11	18	12	22	0	3	16	0	400
348-C0002P	33.4408	137.1969	348-C0002P-145-SMW	CKY 0000 0000 0006 5360 00	2395.50	141	58	99	6	11	17	15	25	0	0	28	0	400
348-C0002P	33.4408	137.1969	348-C0002P-151-SMW	CKY 0000 0000 0006 5361 00	2415.50	139	59	105	11	18	13	16	19	0	0	20	0	400
348-C0002P	33.4408	137.1969	348-C0002P-157-SMW	CKY 0000 0000 0006 5362 00	2435.50	108	84	94	18	15	22	11	26	0	2	20	0	400
348-C0002P	33.4408	137.1969	348-C0002P-161-SMW	CKY 0000 0000 0006 5363 00	2455.50	104	76	96	21	23	13	15	30	0	1	21	0	400
348-C0002P	33.4408	137.1969	348-C0002P-165-SMW	CKY 0000 0000 0006 5364 00	2475.50	139	50	107	17	24	11	13	22	0	1	16	0	400
348-C0002P	33.4408	137.1969	348-C0002P-170-SMW	CKY 0000 0000 0006 5365 00	2495.50	125	76	115	6	17	15	8	20	0	0	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-174-SMW	CKY 0000 0000 0006 5366 00	2515.50	124	71	106	15	12	15	19	20	0	0	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-179-SMW	CKY 0000 0000 0006 5367 00	2535.50	116	75	104	16	9	15	18	30	0	0	17	0	400
348-C0002P	33.4408	137.1969	348-C0002P-183-SMW	CKY 0000 0000 0006 5368 00	2555.50	127	58	96	12	12	10	30	35	0	0	20	0	400
348-C0002P	33.4408	137.1969	348-C0002P-187-SMW	CKY 0000 0000 0006 5369 00	2575.50	109	89	85	17	19	15	14	24	0	0	28	0	400
348-C0002P	33.4408	137.1969	348-C0002P-191-SMW	CKY 0000 0000 0006 5370 00	2595.50	118	75	91	14	4	13	25	35	0	0	25	0	400
348-C0002P	33.4408	137.1969	348-C0002P-197-SMW	CKY 0000 0000 0006 5302 00	2605.50	108	75	105	17	16	14	11	36	0	0	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-198-SMW	CKY 0000 0000 0006 5371 00	2615.50	117	78	95	48	19	7	11	16	0	1	8	0	400
348-C0002P	33.4408	137.1969	348-C0002P-253-SMW	CKY 0000 0000 0006 5303 00	2845.50	134	61	96	18	18	11	9	34	0	1	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-255-SMW	CKY 0000 0000 0006 5304 00	2855.50	121	73	105	24	20	5	15	17	0	3	17	0	400
348-C0002P	33.4408	137.1969	348-C0002P-260-SMW	CKY 0000 0000 0006 5305 00	2875.50	120	75	103	24	16	7	19	15	0	3	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-268-SMW	CKY 0000 0000 0006 5306 00	2915.50	118	71	103	17	20	11	12	26	0	1	21	0	400
348-C0002P	33.4408	137.1969	348-C0002P-272-SMW	CKY 0000 0000 0006 5307 00	2935.50	113	90	91	14	14	9	19	29	0	0	21	0	400
348-C0002P	33.4408	137.1969	348-C0002P-282-SMW	CKY 0000 0000 0006 5308 00	2975.50	109	87	82	22	23	11	20	28	0	0	18	0	400
348-C0002P	33.4408	137.1969	348-C0002P-284-SMW	CKY 0000 0000 0006 5309 00	2985.50	118	73	90	28	9	9	18	31	0	0	24	0	400
348-C0002P	33.4408	137.1969	348-C0002P-286-SMW	CKY 0000 0000 0006 5310 00	2995.50	110	84	101	18	10	13	20	22	0	1	21	0	400