/* DATA DESCRIPTION:
Citation:	Choi, Sarang; Park, Jung-Woo; Im, Sunghwan; Kim, Wonnyon; Choi, Sun Ki: Quantitative digital image analysis dataset of macroscopic dilation and hydrothermal vein area fractions in talc-rich metasomatites from the Onnuri Oceanic Core Complex, Central Indian Ridge [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996126 (dataset in review), 
	In: Choi, S et al.: Geochemical, Mineral Chemical, and Petrological Dataset of Serpentinites and Talc-Rich Metasomatites from the Onnuri Oceanic Core Complex, Central Indian Ridge [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996097 (dataset in review)
Abstract:	Quantitative structural data containing vein area fractions (AA) and calculated macroscopic bulk volume changes (ΔV) were obtained from rock specimens collected during the 2022 R/V ISABU expedition at the Onnuri Oceanic Core Complex (11°25′S, Central Indian Ridge). The aim was to physically constrain and quantify the net volumetric dilation associated with intense, non-deformational static silica metasomatism at mafic–ultramafic interfaces. Hand specimen photographs of representative talc-rich metasomatites were processed using ImageJ software (v.1.53k). Thicker V1 vein boundaries were manually traced, and images were converted to 8-bit grayscale for binary threshold segmentation to isolate combined hydrothermal vein networks (V1 + V2) from the host rock matrix. Bulk volume changes were subsequently computed using the Delesse area-to-volume equivalence principle.
Keyword(s):	Central Indian Ridge; Delesse principle; Hydrothermal vein network; ImageJ segmentation; Onnuri Oceanic Core Complex; Quantitative image analysis; Volume expansion
Coverage:	LATITUDE: -11.420833 * LONGITUDE: 66.407000
	MINIMUM DEPTH, sediment/rock: 0 m * MAXIMUM DEPTH, sediment/rock: 0 m
Event(s):	RD2208_DREG * LATITUDE: -11.420833 * LONGITUDE: 66.407000 * ELEVATION: -2160.0 m * METHOD/DEVICE: Dredge (DRG) * COMMENT: Geomorphology: Detachment fault surface. Lithology: Diabase, Serpentinite, Talc-rich metasomatite, Breccia
Parameter(s):	DEPTH, sediment/rock [m] (Depth sed) * GEOCODE * PI: Choi, Sarang (https://orcid.org/0000-0003-4942-8625, csr7824@gmail.com)
	Lithology/composition/facies (Lithology) * PI: Choi, Sarang (https://orcid.org/0000-0003-4942-8625, csr7824@gmail.com)
	Sample number (Sample no) * PI: Choi, Sarang (https://orcid.org/0000-0003-4942-8625, csr7824@gmail.com)
	Vein area fraction (AA) * PI: Choi, Sarang (https://orcid.org/0000-0003-4942-8625, csr7824@gmail.com) * METHOD/DEVICE: ImageJ software
	Volume change, macroscopic bulk (ΔV) * PI: Choi, Sarang (https://orcid.org/0000-0003-4942-8625, csr7824@gmail.com) * METHOD/DEVICE: ImageJ software * COMMENT: ΔV = AA / (1 - AA
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) (License comes into effect after moratorium ends)
Status:	Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels)
Size:	19 data points
*/
Depth sed [m]	Lithology	Sample no	AA	ΔV
0	Talc-rich metasomatite	RD2208-04	0.265	0.361
0	Talc-rich metasomatite	RD2208-12	0.247	0.328
0	Talc-rich metasomatite	RD2208-13	0.178	0.217
0	Talc-rich metasomatite	RD2208-38	0.226	0.292
0		Average	0.229	0.299