Wu, Jiawang; Liu, Zhifei; Yu, Xun (2022): Strontium and Nd isotope compositions of hydrothermally altered basaltic rocks in IODP Hole 368-U1502B (Dataset S4) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.946143, In: Wu, J et al. (2022): Geochemistry of IODP Hole U1502B at the South China Sea rifted margin [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.946146
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Published: 2022-07-08 • DOI registered: 2022-08-30
Keyword(s):
Related to:
Wu, Jiawang; Liu, Zhifei; Yu, Xun (2021): Plagioclase-regulated hydrothermal alteration of basaltic rocks with implications for the South China Sea rifting. Chemical Geology, 585, 120569, https://doi.org/10.1016/j.chemgeo.2021.120569
Funding:
Shanghai Association for Science and Technology (SAST), grant/award no. 20590780200: Shanghai Science and Technology Innovation Action Plan
Coverage:
Latitude: 18.464663 * Longitude: 116.230682
Date/Time Start: 2017-04-29T19:30:00 * Date/Time End: 2017-05-13T20:50:00
Minimum DEPTH, sediment/rock: 733.75 m * Maximum DEPTH, sediment/rock: 917.41 m
Event(s):
368-U1502B * Latitude: 18.464663 * Longitude: 116.230682 * Date/Time Start: 2017-04-29T19:30:00 * Date/Time End: 2017-05-13T20:50:00 * Elevation: -3763.6 m * Campaign: Exp368 * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL) * Comment: Drill in casing to 723.7 mbsf
Comment:
a Six sample-types are distinguished (see Section 4); note that the fully altered samples and the breccia sample are taken as endmembers of the hydrothermal alteration and associated brecciation, respectively.
b Normalized to the NBS-SRM 987 value of 87Sr/86Sr = 0.710248 (Thirlwall, 1991), with 2SE internal errors in brackets; the 2SD external errors are <18 ppm; the 2σ uncertainties in 87Sr/86Sr from BHVO-2 and AGV-2 standards are 0.703467 ± 0.000010 (n=2) and 0.703959 ± 0.000015 (n=3), respectively.
c Normalized to the JNdi-1 value of 143Nd/144Nd = 0.512115 (Tanaka et al., 2000), with 2SE internal errors in brackets; εNd = [(143Nd/144Nd) measured / (143Nd/144Nd) CHUR – 1] × 104, while CHUR is 0.512638 (Jacobson and Wasserburg, 1980); the 2SD external errors are <19 ppm (i.e. <0.4 εNd-unit); the 2σ uncertainties in 143Nd/144Nd from BHVO-2 and AGV-2 standards are 0.512997 ± 0.000028 (n=2) and 0.512802 ± 0.000038 (n=3), respectively.
d Degree of alteration in natural hydrothermal system can be estimated (cf. Kawahata et al., 2001; Delacour et al., 2008): Sr isotope exchange = (εSrfrock – εSrirock) / (εSriwater – εSrirock), where the subscripts (water) and (rock) refer to the hydrothermal fluid and altered rock, respectively; and the superscripts (i) and (f) identify the initial and final values of Sr isotope ratios, respectively.
e Assuming the final equilibrium of Sr isotope, the water–rock interaction can be quantified by simple mass balance equations, respectively, for closed system (cf. Berndt et al., 1988; Kawahata et al., 2001) and for open system (cf. Albarède, 1995; Delacour et al., 2008); W/R ratio (close system) = (εSrirock – εSrfrock) / (εSrfrock – εSriwater) * (Srrock / Srwater); W/R ratio (open system) = ln [(εSrirock – εSrfrock) / (εSrfrock – εSriwater) +1] * (Srrock / Srwater); where W is the mass of hydrothermal fluid, R is the mass of rock being altered; εSrirock and εSrfrock is the initial and final isotopic ratio of rock, respectively; εSriwater and εSrfwater is the initial (i.e. seawater) and final isotopic ratio of fluid, respectively; note that εSrfrock is equal to εSrfwater; Srrock and Srwater is the Sr concentration of unaltered rock and of seawater, respectively. The values of εSrirock (87Sr/86Sr: 0.70309) and Srrock (Sr: 168 ppm) after the mean values of Site U1500 basalts (Yu and Liu, 2020) and SCS seafloor basalts (i.e. Sites U1431, U1433, and U1434; Zhang et al., 2018), and the values of εSrfwater (87Sr/86Sr: 0.70780; McArthur et al., 2012) and Srwater (Sr: 12 ppm; Antonelli et al., 2017) after the global seawater estimates of the late-Eocene age.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Wu, Jiawang | |||
| 2 | DEPTH, sediment/rock | Depth sed | m | Wu, Jiawang | Geocode – mbsf | |
| 3 | Sample type | Samp type | Wu, Jiawang | |||
| 4 | Strontium | Sr | mg/kg | Wu, Jiawang | given in ppm | |
| 5 | Neodymium | Nd | mg/kg | Wu, Jiawang | given in ppm | |
| 6 | Strontium-87/Strontium-86 ratio | 87Sr/86Sr | Wu, Jiawang | b | ||
| 7 | Strontium-87/Strontium-86 ratio, standard deviation | 87Sr/86Sr std dev | ± | Wu, Jiawang | 2σ, b | |
| 8 | Neodymium-143/Neodymium-144 ratio | 143Nd/144Nd | Wu, Jiawang | |||
| 9 | Neodymium-143/Neodymium-144 ratio, standard deviation | 143Nd/144Nd std dev | ± | Wu, Jiawang | 2σ, c | |
| 10 | ε-Neodymium | ε-Nd | Wu, Jiawang | c | ||
| 11 | ε-Neodymium, standard deviation | ε-Nd std dev | ± | Wu, Jiawang | ||
| 12 | Strontium isotope exchange | Sr ex | % | Wu, Jiawang | d | |
| 13 | Water/rock ratio | W/R ratio | Wu, Jiawang | closed, e | ||
| 14 | Water/rock ratio | W/R ratio | Wu, Jiawang | open, e |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
401 data points
Data
| 1 Sample label | 2 Depth sed [m] (mbsf) | 3 Samp type | 4 Sr [mg/kg] (given in ppm) | 5 Nd [mg/kg] (given in ppm) | 6 87Sr/86Sr (b) | 7 87Sr/86Sr std dev [±] (2σ, b) | 8 143Nd/144Nd | 9 143Nd/144Nd std dev [±] (2σ, c) | 10 ε-Nd (c) | 11 ε-Nd std dev [±] | 12 Sr ex [%] (d) | 13 W/R ratio (closed, e) | 14 W/R ratio (open, e) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 03R1W4-10 | 733.75 | breccia | 590 | 28 | 0.709146 | -0.000016 | 0.512259 | -0.000009 | -7.4 | 0.2 | |||
| 04R2W47-51 | 740.70 | basaltic breccia | 146 | 18 | 0.705413 | -0.000021 | 0.513037 | -0.000009 | 7.8 | 0.2 | 49.3 | 13.6 | 9.5 |
| 06R1W5-10 | 757.98 | basaltic breccia | 194 | 7 | 0.704307 | -0.000023 | 0.513029 | -0.000009 | 7.6 | 0.2 | 25.8 | 4.9 | 4.2 |
| 09R1W46-50 | 787.18 | basaltic breccia | 794 | 25 | 0.706829 | -0.000023 | 0.513101 | -0.000010 | 9.0 | 0.2 | 79.4 | 53.9 | 22.1 |
| 09R2W49-52 | 788.52 | brecciated basalt | 146 | 17 | 0.704944 | -0.000022 | 0.513116 | -0.000009 | 9.3 | 0.2 | 39.4 | 9.1 | 7 |
| 11R1W114-119 | 797.46 | brecciated basalt | 124 | 12 | 0.706961 | -0.000019 | 0.513099 | -0.000009 | 9.0 | 0.2 | 82.2 | 64.6 | 24.2 |
| 13R1W44-48 | 806.35 | brecciated basalt | 117 | 14 | 0.706142 | -0.000024 | 0.513082 | -0.000008 | 8.7 | 0.2 | 64.8 | 25.8 | 14.6 |
| 13R4W32-36 | 810.46 | basalt, altered | 109 | 19 | 0.705333 | -0.000020 | 0.513099 | -0.000009 | 9.0 | 0.2 | 47.6 | 12.7 | 9.1 |
| 15R2W68-72 | 817.70 | basalt, fresher | 224 | 6 | 0.703835 | -0.000018 | 0.513106 | -0.000021 | 9.1 | 0.4 | 15.8 | 2.6 | 2.4 |
| 15R3W85-92 | 819.30 | fully altered | 41 | 24 | 0.706876 | -0.000031 | 0.513098 | -0.000010 | 9.0 | 0.2 | 80.4 | 57.4 | 22.8 |
| 16R2W76-80 | 822.15 | basaltic breccia | 105 | 13 | 0.705904 | -0.000022 | 0.513107 | -0.000009 | 9.1 | 0.2 | 59.7 | 20.8 | 12.7 |
| 16R3W36-40 | 823.21 | basalt, altered | 160 | 12 | 0.705564 | -0.000020 | 0.513118 | -0.000010 | 9.4 | 0.2 | 52.5 | 15.5 | 10.4 |
| 17R1W13-20 | 825.25 | basalt, fresher | 170 | 12 | 0.704189 | -0.000021 | 0.513111 | -0.000009 | 9.2 | 0.2 | 23.3 | 4.3 | 3.7 |
| 21R2W100-106 | 846.43 | basalt, altered | 179 | 11 | 0.705788 | -0.000020 | 0.513093 | -0.000011 | 8.9 | 0.2 | 57.3 | 18.8 | 11.9 |
| 23R1W95-100 | 851.33 | basalt, fresher | 169 | 10 | 0.704502 | -0.000016 | 0.513080 | -0.000012 | 8.6 | 0.2 | 30.0 | 6 | 5 |
| 24R3W46-52 | 856.98 | basalt, altered | 66 | 11 | 0.706287 | -0.000019 | 0.513003 | -0.000011 | 7.1 | 0.2 | 67.9 | 29.6 | 15.9 |
| 25R2W93-98 | 860.75 | basalt, fresher | 184 | 10 | 0.705223 | -0.000016 | 0.513084 | -0.000010 | 8.7 | 0.2 | 45.3 | 11.6 | 8.4 |
| 25R3W46-49 | 861.63 | basalt, fresher | 219 | 8 | 0.703951 | -0.000020 | 0.513081 | -0.000010 | 8.6 | 0.2 | 18.3 | 3.1 | 2.8 |
| 27R2W130-134 | 870.73 | basalt, altered | 148 | 8 | 0.705874 | -0.000018 | 0.513083 | -0.000016 | 8.7 | 0.3 | 59.1 | 20.2 | 12.5 |
| 27R3W48-53 | 871.31 | fully altered | 49 | 42 | 0.706938 | -0.000051 | 0.513084 | -0.000011 | 8.7 | 0.2 | 81.7 | 62.5 | 23.8 |
| 27R4W71-76 | 872.06 | basalt, fresher | 201 | 15 | 0.704718 | -0.000017 | 0.513093 | -0.000010 | 8.9 | 0.2 | 34.6 | 7.4 | 5.9 |
| 29R2W2-5 | 878.97 | fully altered | 193 | 43 | 0.705854 | -0.000022 | 0.513067 | -0.000008 | 8.4 | 0.2 | 58.7 | 19.9 | 12.4 |
| 31R2W97-100 | 888.91 | basalt, altered | 83 | 18 | 0.705920 | -0.000024 | 0.513063 | -0.000008 | 8.3 | 0.2 | 60.1 | 21.1 | 12.9 |
| 31R3W59-63 | 889.96 | basalt, altered | 110 | 14 | 0.705943 | -0.000019 | 0.513062 | -0.000010 | 8.3 | 0.2 | 60.6 | 21.5 | 13 |
| 33R2W22-27 | 897.73 | basalt, altered | 180 | 16 | 0.704548 | -0.000017 | 0.513053 | -0.000009 | 8.1 | 0.2 | 31.0 | 6.3 | 5.2 |
| 35R2W59-63 | 907.68 | basalt, altered | 209 | 11 | 0.705038 | -0.000018 | 0.513006 | -0.000010 | 7.2 | 0.2 | 41.4 | 9.9 | 7.5 |
| 35R3W51-57 | 909.13 | basalt, fresher | 198 | 13 | 0.703845 | -0.000015 | 0.513106 | -0.000014 | 9.1 | 0.3 | 16.0 | 2.7 | 2.4 |
| 36R2W14-18 | 912.77 | brecciated basalt | 129 | 12 | 0.706415 | -0.000020 | 0.513115 | -0.000009 | 9.3 | 0.2 | 70.6 | 33.6 | 17.1 |
| 36R3W45-48 | 914.50 | basalt, fresher | 175 | 17 | 0.704347 | -0.000024 | 0.513085 | -0.000008 | 8.7 | 0.2 | 26.7 | 5.1 | 4.3 |
| 37R2W30-35 | 917.41 | basalt, fresher | 173 | 17 | 0.703950 | -0.000023 | 0.513072 | -0.000010 | 8.5 | 0.2 | 18.3 | 3.1 | 2.8 |
| BHVO-2 (n=2) | 436 | 24 | 0.703467 | -0.000010 | 0.512997 | -0.000028 | |||||||
| AGV-2 (n=3) | 675 | 30 | 0.703959 | -0.000015 | 0.512802 | -0.000038 |