LEG 158—SCIENTIFIC RESULTS
TAG: Drilling an Active Hydrothermal System on a Sediment-free Slow-spreading Ridge
Site 957

May 1998
ISSN 1096-7451
doi:10.2973/odp.proc.sr.158.1998

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TABLE OF CONTENTS

Preliminary Pages

Acknowledgments, pp. 1-2 (132 KB)

SECTION 1: MINERALOGY AND GEOCHEMISTRY OF HYDROTHERMAL PRECIPITATES

1. Petrology of hydrothermal mineralization: a vertical section through the TAG mound, pp. 5-26
R. Knott, Y. Fouquet, J. Honnorez, S. Petersen, and M. Bohn (10 MB)
doi:10.2973/odp.proc.sr.158.201.1998


2. Data Report: Major and trace element geochemistry of shipboard samples from Site 957, TAG hydrothermal field, Mid-Atlantic Ridge, pp. 27-40
M.D. Hannington, P.M. Herzig, S. Petersen, D.C. Gregoire, and P. Belanger (726 KB)
doi:10.2973/odp.proc.sr.158.203.1998

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3. Data Report: Geochemical analyses of massive sulfide and sediment samples from the TAG hydrothermal mound, pp. 41-46
D.J. Miller (377 KB)
doi:10.2973/odp.proc.sr.158.204.1998

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4. Geochemistry and sulfur-isotopic composition of the TAG hydrothermal mound, Mid-Atlantic Ridge, 26N, pp. 47-70
P.M. Herzig, S. Petersen, and M.D. Hannington (3.3 MB)
doi:10.2973/odp.proc.sr.158.202.1998

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5. Detailed sulfur-isotope investigation of the TAG hydrothermal mound and stockwork zone, 26N, Mid-Atlantic Ridge, pp. 71-84
J.B. Gemmell and R. Sharpe (5.7 MB)
doi:10.2973/odp.proc.sr.158.206.1998

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6. Stable isotope study of anhydrite and sulfide minerals at the TAG hydrothermal mound, Mid-Atlantic Ridge, 26N, pp. 85-90
H. Chiba, N. Uchiyama, and D.A.H. Teagle (431 KB)
doi: 10.2973/odp.proc.sr.158.207.1998

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7. Os isotopic composition and Os and Re distribution in the active mound of the TAG hydrothermal system, Mid-Atlantic Ridge, pp. 91-100
G.E. Brgmann, J.L. Birck, P.M. Herzig, and A.W. Hofmann (577 KB)
doi:10.2973/odp.proc.sr.158.209.1998

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8. Lead isotopic compositions of the TAG mineralization, Mid-Atlantic Ridge, 2608N, pp. 101-110
A.-S. Andrieux, J.J. Honnorez, and J. Lancelot (3.8 MB)
doi:10.2973/odp.proc.sr.158.215.1998

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9. Age of sub-bottom sulfide samples at the TAG active mound, pp. 111-118
C. Lalou, J.L. Reyss, and E. Brichet (416 KB)
doi:10.2973/odp.proc.sr.158.214.1998

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10. Fluid mixing and anhydrite precipitation within the TAG mound, pp. 119-128
R.A. Mills, D.A.H. Teagle, and M.K. Tivey (754 KB)
doi:10.2973/odp.proc.sr.158.212.1998

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11. Dissecting an active hydrothermal deposit: the strontium and oxygen isotopic anatomy of the TAG hydrothermal mound--anhydrite, pp. 129-142
D.A.H. Teagle, J.C. Alt, H. Chiba, and A.N. Halliday (693 KB)
doi:10.2973/odp.proc.sr.158.223.1998

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12. Rare earth element composition of anhydrite: implications for deposition and mobility within the active TAG hydrothermal mound, pp. 143-160
S.E. Humphris (1.4 MB)
doi:10.2973/odp.proc.sr.158.213.1998

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SECTION 2: FLUID INCLUSION STUDIES

 

13. Fluid inclusion studies as a guide to the temperature regime within the TAG hydrothermal mound, 26N, Mid-Atlantic Ridge, pp. 163-178
S. Petersen, P.M. Herzig, and M.D. Hannington (4.4 MB)
doi:10.2973/odp.proc.sr.158.210.1998

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14.Temperature and salinity of fluid inclusions in anhydrite as indicators of seawater entrainment and heating in the TAG active mound, pp. 179-190
M.K. Tivey, R.A. Mills, and D.A.H. Teagle (1.9 MB)
doi:10.2973/odp.proc.sr.158.211.1998

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SECTION 3: TEXTURAL STUDIES

 

15. Data Report: Sulfide textures in the active TAG massive sulfide deposit, 26N, Mid-Atlantic Ridge, pp. 193-200
D. Brown and K.R. McClay (1.9 MB)
doi:10.2973/odp.proc.sr.158.224.1998

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16. Documenting textures and mineral abundances in minicores from the TAG active hydrothermal mound using X-ray computed tomography, pp. 201-210
M.K. Tivey (697 KB)
doi:10.2973/odp.proc.sr.158.226.1998

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SECTION 4: BASALT CHEMISTRY AND ALTERATION

 

17. Geochemistry of basaltic rocks from the TAG hydrothermal mound (2608N), Mid-Atlantic Ridge, pp. 213-230
S.E. Smith and S.E. Humphris (1 MB)
doi:10.2973/odp.proc.sr.158.218.1998

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18. Vivisection and autopsy of active and fossil hydrothermal alterations of basalt beneath and within the TAG hydrothermal mound, pp. 231-254
J.J. Honnorez, J.C. Alt, and S.E. Humphris (20 MB)
doi:10.2973/odp.proc.sr.158.219.1998

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19. Geochemical changes during hydrothermal alteration of basement in the stockwork beneath the active TAG hydrothermal mound, pp. 255-276
S.E. Humphris, J.C. Alt, D.A.H. Teagle, and J.J. Honnorez (1.5 MB)
doi:10.2973/odp.proc.sr.158.220.1998

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20. Mineralogy and chemical composition of clay minerals, TAG hydrothermal mound, pp. 277-284
A. Sturz, M. Itoh, and S. Smith (564 KB)
doi:10.2973/odp.proc.sr.158.221.1998

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21. Probing the TAG hydrothermal mound and stockwork: oxygen-isotopic profiles from deep ocean drilling, pp. 285-296
J.C. Alt and D.A.H. Teagle (704 KB)
doi:10.2973/odp.proc.sr.158.222.1998

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22. Dissecting an active hydrothermal deposit: the strontium and oxygen isotopic anatomy of the TAG hydrothermal mound--whole rock and silicate minerals, pp. 297-310
D.A.H. Teagle, J.C. Alt, S.E. Humphris, and A.N. Halliday (750 KB)
doi:10.2973/odp.proc.sr.158.231.1998

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SECTION 5: PHYSICAL PROPERTIES

23. Seismic velocity-porosity relationship of sulfide, sulfate, and basalt samples from the TAG hydrothermal mound, pp. 313-328
R.J. Ludwig, G.J. Iturrino, and P.A. Rona (947 KB)
doi:10.2973/odp.proc.sr.158.225.1998

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24. Thermal properties of TAG hydrothermal precipitates, Mid-Atlantic Ridge, and comparison with Middle Valley, Juan de Fuca Ridge, pp. 329-336
P.A. Rona, E.E. Davis, and R.J. Ludwig (410 KB)
doi:10.2973/odp.proc.sr.158.227.1998

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25. Magnetic properties of Leg 158 cores: the origin of remanence and its relation to alteration and mineralization of the active TAG mound, pp. 337-352
X. Zhao, B. Housen, P. Solheid, and W. Xu (5.6 MB)
doi:10.2973/odp.proc.sr.158.228.1998

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SECTION 6: MICROBIOLOGY

26. In search of a subsurface biosphere at a slow-spreading ridge, pp. 355-360
A.-L. Reysenbach, N.G. Holm, K. Hershberger, D. Prieur, and C. Jeanthon (671 KB)
doi:10.2973/odp.proc.sr.158.229.1998

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SECTION 7: COMPARATIVE STUDIES

 

27. Geochemical section of the TAG hydrothermal mound , pp. 363-388
Y. Fouquet, K. Henry, R. Knott, and P. Cambon (1.6 MB)

doi10.2973/odp.proc.sr.158.216.1998

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28. Comparison of the TAG mound and stockwork complex with Cyprus-type, massive sulfide deposits, pp. 389-416
M.D. Hannington, A.G. Galley, P.M. Herzig, and S. Petersen (4 MB)
doi:10.2973/odp.proc.sr.158.217.1998

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SECTION 9: INDEX

Index, pp. 419 (925 B)


Logging Data for Leg 158, please contact Lamont-Doherty Earth Observatory.