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Lackschewitz, Klas S; Devey, Colin W; Stoffers, Peter; Botz, Reiner; Eisenhauer, Anton; Kummetz, M; Schmidt, Mark; Singer, A (2004): Mineral, chemical and isotopic compositions of altered rocks at ODP Sites 193-1188 and 193-1189. PANGAEA, https://doi.org/10.1594/PANGAEA.710756, Supplement to: Lackschewitz, KS et al. (2004): Mineralogical, geochemical and isotopic characteristics of hydrothermal alteration processes in the active, submarine, felsic-hosted PACMANUS field, Manus Basin, Papua New Guinea. Geochimica et Cosmochimica Acta, 68(21), 4405-4427, https://doi.org/10.1016/j.gca.2004.04.016

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Abstract:
During ODP Leg 193, 4 sites were drilled in the active PACMANUS hydrothermal field on the crest of the felsic Pual Ridge to examine the vertical and lateral variations in mineralization and alteration patterns. We present new data on clay mineral assemblages, clay and whole rock chemistry and clay mineral strontium and oxygen isotopic compositions of altered rocks from a site of diffuse low-temperature venting (Snowcap, Site 1188) and a site of high-temperature venting (Roman Ruins, Site 1189) in order to investigate the water-rock reactions and associated elemental exchanges.
The volcanic succession at Snowcap has been hydrothermally altered, producing five alteration zones: (1) chlorite+/-illite-cristobalite-plagioclase alteration apparently overprinted locally by pyrophyllite bleaching at temperatures of 260-310°C; (2) chlorite+/-mixed-layer clay alteration at temperatures of 230°C; (3) chlorite and illite alteration; (4) illite and chlorite+/-illite mixed-layer alteration at temperatures of 250-260°C; and (5) illite+/-chlorite alteration at 290-300°C. Felsic rocks recovered from two holes (1189A and 1189B) at Roman Ruins, although very close together, show differing alteration features. Hole 1189A is characterized by a uniform chlorite-illite alteration formed at ~250°C, overprinted by quartz veining at 350°C. In contrast, four alteration zones occur in Hole 1189B: (1) illite+/-chlorite alteration formed at ~300°C; (2) chlorite+/-illite alteration at 235°C; (3) chlorite+/-illite and mixed layer clay alteration; and (4) chlorite+/-illite alteration at 220°C.
Mass balance calculations indicate that the chloritization, illitization and bleaching (silica-pyrophyllite assemblages) alteration stages are accompanied by different chemical changes relative to a calculated pristine precursor lava. The element Cr appears to have a general enrichment in the altered samples from PACMANUS. The clay concentrate data show that Cr and Cu are predominantly present in the pyrophyllites. Illite shows a significant enrichment for Cs and Cu relative to the bulk altered samples.
Considerations of mineral stability allow us to place some constraints on fluid chemistry. Hydrothermal fluid pH for the chloritization and illitization was neutral to slightly acidic and relatively acidic for the pyrophyllite alteration. In general the fluids, especially from Roman Ruins and at intermediate depths below Snowcap, show only a small proportion of seawater mixing (<10%). Fluids in shallow and deep parts of the Snowcap holes, in contrast, show stronger seawater influence.
Project(s):
Coverage:
Median Latitude: -3.725683 * Median Longitude: 151.671567 * South-bound Latitude: -3.728300 * West-bound Longitude: 151.669800 * North-bound Latitude: -3.720600 * East-bound Longitude: 151.675100
Date/Time Start: 2000-11-18T17:30:00 * Date/Time End: 2000-12-30T04:00:00
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
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18 datasets

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Datasets listed in this publication series

  1. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 1) Mineralogical assemblages of the clay fraction (<2 µm) of altered felsic rocks from ODP Hole 193-1188A. https://doi.org/10.1594/PANGAEA.710734
  2. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 1) Mineralogical assemblages of the clay fraction (<2 µm) of altered felsic rocks from ODP Hole 193-1188F. https://doi.org/10.1594/PANGAEA.710735
  3. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 2) Mineralogical assemblages of the clay fraction (<2 µm) of altered felsic rocks from ODP Hole 193-1189A. https://doi.org/10.1594/PANGAEA.710736
  4. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 3) Mineralogical assemblages of the clay fraction (<2 µm) of altered felsic rocks from ODP Hole 193-1189B. https://doi.org/10.1594/PANGAEA.710737
  5. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 4) Representative electron microprobe analyses of phyllosilicates from ODP Hole 193-1188A. https://doi.org/10.1594/PANGAEA.710741
  6. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 4) Representative electron microprobe analyses of phyllosilicates from ODP Hole 193-1188F. https://doi.org/10.1594/PANGAEA.710740
  7. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 4) Representative electron microprobe analyses of phyllosilicates from ODP Site 193-1189. https://doi.org/10.1594/PANGAEA.710743
  8. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 5) Trace element contents in hydrothermal clay minerals from ODP Hole 193-1188A. https://doi.org/10.1594/PANGAEA.710745
  9. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 5) Trace element contents in hydrothermal clay minerals from ODP Hole 193-1188F. https://doi.org/10.1594/PANGAEA.710746
  10. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 5) Trace element contents in hydrothermal clay minerals from ODP Site 193-1189. https://doi.org/10.1594/PANGAEA.710744
  11. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 6) Strontium isotopic compositions and strontium concentrations in hydrothermal clay minerals from ODP Hole 193-1188A. https://doi.org/10.1594/PANGAEA.710747
  12. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 6) Strontium isotopic compositions and strontium concentrations in hydrothermal clay minerals from ODP Hole 193-1188F. https://doi.org/10.1594/PANGAEA.710748
  13. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 7) Oxygen isotope ratio and calculated mineral formation temperature of clay and quartz samples from ODP Hole 193-1189A. https://doi.org/10.1594/PANGAEA.710752
  14. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 7) Oxygen isotope ratio and calculated mineral formation temperature of clay and quartz samples from ODP Hole 193-1189B. https://doi.org/10.1594/PANGAEA.710753
  15. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 7) Oxygen isotope ratio and calculated mineral formation temperature of clay samples from ODP Hole 193-1188A. https://doi.org/10.1594/PANGAEA.710750
  16. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 7) Oxygen isotope ratio and calculated mineral formation temperature of clay samples from ODP Hole 193-1188F. https://doi.org/10.1594/PANGAEA.710751
  17. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 8) Chemical compositions of strongly altered bulk rock compared to that in the fresh precursor from ODP Hole 193-1188F. https://doi.org/10.1594/PANGAEA.710755
  18. Lackschewitz, KS; Devey, CW; Stoffers, P et al. (2004): (Table 8) Chemical compositions of strongly altered bulk rocks compared to that in the fresh precursors from ODP Hole 193-1188A. https://doi.org/10.1594/PANGAEA.710754