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

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Datasets with similar metadata

Cornard, P; Dawson, H; Pickering, KT (2024): Volumetric proportion of grains from the Nankai subduction zone (Japan) at IODP Site 348-C0002. https://doi.org/10.1594/PANGAEA.969333
Cornard, P; Dawson, H; Pickering, KT (2024): Detrital zircon U/Pb ages from the Nankai subduction zone (Japan). https://doi.org/10.1594/PANGAEA.969327
Treude, T; Beulig, F; Schubert, F et al. (2021): Methanogenesis and Sulfate Reduction Data from IODP Expedition 370, Nankai Trough Subduction Zone, Japan. https://doi.org/10.1594/PANGAEA.930403