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Craddock, Paul R; Bach, Wolfgang (2010): (Table S1) Trace element and isotopic compositions of anhydrites sampled in the Manus Basin, Papua New Guinea. PANGAEA, https://doi.org/10.1594/PANGAEA.783068, Supplement to: Craddock, PR; Bach, W (2010): Insights to magmatic-hydrothermal processes in the Manus back-arc basin as recorded by anhydrite. Geochimica et Cosmochimica Acta, 74(19), 5514-5536, https://doi.org/10.1016/j.gca.2010.07.004

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Abstract:
Microchemical analyses of rare earth element (REE) concentrations and Sr and S isotope ratios of anhydrite are used to identify sub-seafloor processes governing the formation of hydrothermal fluids in the convergent margin Manus Basin, Papua New Guinea. Samples comprise drill-core vein anhydrite and seafloor massive anhydrite from the PACMANUS (Roman Ruins, Snowcap and Fenway) and SuSu Knolls (North Su) active hydrothermal fields. Chondrite-normalized REE patterns in anhydrite show remarkable heterogeneity on the scale of individual grains, different from the near uniform REEN patterns measured in anhydrite from mid-ocean ridge deposits. The REEN patterns in anhydrite are correlated with REE distributions measured in hydrothermal fluids venting at the seafloor at these vent fields and are interpreted to record episodes of hydrothermal fluid formation affected by magmatic volatile degassing. 87Sr/86Sr ratios vary dramatically within individual grains between that of contemporary seawater and that of endmember hydrothermal fluid. Anhydrite was precipitated from a highly variable mixture of the two. The intra-grain heterogeneity implies that anhydrite preserves periods of contrasting hydrothermal versus seawater dominant near-seafloor fluid circulation. Most sulfate d34S values of anhydrite cluster around that of contemporary seawater, consistent with anhydrite precipitating from hydrothermal fluid mixed with locally entrained seawater. Sulfate d34S isotope ratios in some anhydrites are, however, lighter than that of seawater, which are interpreted as recording a source of sulfate derived from magmatic SO2 degassed from underlying felsic magmas in the Manus Basin. The range of elemental and isotopic signatures observed in anhydrite records a range of sub-seafloor processes including high-temperature hydrothermal fluid circulation, varying extents of magmatic volatile degassing, seawater entrainment and fluid mixing. The chemical and isotopic heterogeneity recorded in anhydrite at the inter- and intra-grain scale captures the dynamics of hydrothermal fluid formation and sub-seafloor circulation that is highly variable both spatially and temporally on timescales over which hydrothermal deposits are formed. Microchemical analysis of hydrothermal minerals can provide information about the temporal history of submarine hydrothermal systems that are variable over time and cannot necessarily be inferred only from the study of vent fluids.
Project(s):
Coverage:
Median Latitude: -3.737213 * Median Longitude: 151.336212 * South-bound Latitude: -3.750000 * West-bound Longitude: 151.000000 * North-bound Latitude: -3.720600 * East-bound Longitude: 151.675100
Date/Time Start: 2000-11-18T17:30:00 * Date/Time End: 2006-08-22T23:56:11
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: 300 m
Event(s):
193-1188A * Latitude: -3.728300 * Longitude: 151.669900 * Date/Time Start: 2000-11-18T17:30:00 * Date/Time End: 2000-11-22T08:30:00 * Elevation: -1640.2 m * Penetration: 211.6 m * Recovery: 21.93 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 211.6 m cored; 0 m drilled; 10.4 % recovery
193-1188F * Latitude: -3.728100 * Longitude: 151.669800 * Date/Time Start: 2000-12-29T15:15:00 * Date/Time End: 2000-12-30T04:00:00 * Elevation: -1641.7 m * Penetration: 386.7 m * Recovery: 30.89 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 168.7 m cored; 218 m drilled; 18.3 % recovery
193-1189A * Latitude: -3.720700 * Longitude: 151.674900 * Date/Time Start: 2000-11-22T08:30:00 * Date/Time End: 2000-11-23T20:45:00 * Elevation: -1690.2 m * Penetration: 125.8 m * Recovery: 8.58 m * Location: Bismarck Sea * Campaign: Leg193 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 125.8 m cored; 0 m drilled; 6.8 % recovery
Comment:
Sediment depth is given in mbsf. Pr, Tb and Lu not determined.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelCraddock, Paul RODP sample designation
3DEPTH, sediment/rockDepthmGeocode
4NumberNoCraddock, Paul RSpot number
5Area/localityAreaCraddock, Paul R
6StrontiumSrmg/kgCraddock, Paul R
7MagnesiumMgmg/kgCraddock, Paul R
8BariumBamg/kgCraddock, Paul R
9LanthanumLamg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
10CeriumCemg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
11NeodymiumNdmg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
12SamariumSmmg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
13EuropiumEumg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
14GadoliniumGdmg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
15DysprosiumDymg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
16HolmiumHomg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
17ErbiumErmg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
18YtterbiumYbmg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
19Rare-earth elementsREEmg/kgCraddock, Paul RLA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
20Lanthanum/Ytterbium ratioLa/YbCraddock, Paul Rnormalized
21Samarium/Ytterbium ratioSm/YbCraddock, Paul Rnormalized
22Europium anomalyEu/Eu*Craddock, Paul Rnormalized
23Strontium 87/Strontium 8687Sr/86SrCraddock, Paul RMC-ICP-MS Thermo-Finnigan Neptune
24δ34Sδ34S‰ CDTCraddock, Paul RMC-ICP-MS Thermo-Finnigan Neptune
Size:
8814 data points

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