Initial Reports of the Deep Sea Drilling Project, 83

Anderson, Roger N.; Honnorez, J.; Becker, Keir

doi:10.2973/dsdp.proc.83.1985

Cited by 48 publications

(14 citation statements)

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“…In the present study, samples collected during legs 69, 70 and 83 were examined. By the end of leg 83, Hole 504B had penetrated 1075 m into basalt basement and extended through the entire extrusive volcanic pile into a zone of sheeted dykes and massive units of what is believed to be seismic layer 2c (Cann et al 1983;Anderson et al 1985). To a depth of -850 mbsf, the basalts were found to have experienced primarily lowtemperature alteration.…”

Section: Dsdplodp Samples a N D Experimental Techniquesmentioning

confidence: 97%

Seismic properties of layer 2 basalts

Johnston

Christensen

1997

Geophysical Journal International

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S U M M A R YIn this paper the physical properties of oceanic layer 2 basalts are examined with the emphasis on microcrack porosity and alteration-related changes in physical properties. Over 160 core samples from some of the more significant Deep Sea Drilling Project/Ocean Drilling Program holes, including 417D, 418A, 504B and 801C are included in the present investigation. Overall physical property relationships are discussed in the first half of this study. At 200 MPa confining pressure, compressionaland shear-wave velocities of the sample suite have modal values of 6.1 kms-' and 3.5 kms-', respectively. A Poisson's ratio of 0.28 characterizes the majority of the basalts. Samples that have experienced extensive low-temperature alteration, identified through elevated K,O and decreased CaO and MgO contents, exhibit low velocities (and densities) and high Poisson's ratios.The microcrack porosity in the basalt suite is examined using velocity-pressure data, a pore-aspect-ratio inversion scheme, and scanning electron microscope (SEM) imaging. Microcracks sealed by alteration minerals such as smectite and calcite or healed by late crystallization are common throughout the sample set. Rocks from the transition zone and sheeted dyke section of Hole 504B are marked by numerous smectite-and chlorite-filled cracks. More significantly, the data indicate an increase of low-aspectratio open microcracks with increasing depth in samples from several DSDP holes, particularly Hole 504B. These microcracks, also observed using the SEM, are attributed to stress relief as the original drill cores were removed from in situ pressure conditions. Stress-relief microcracking is apparently more severe in the holocrystalline, coarsergrained samples from massive flows than in the phyric basalts with fine-grained groundmasses characteristic of pillow units. This difference in microcracking is explained through basic fracture theory

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Section: Dsdplodp Samples a N D Experimental Techniquesmentioning

confidence: 97%

Seismic properties of layer 2 basalts

Johnston

Christensen

1997

Geophysical Journal International

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“…Operations in Hole 504B were carried out over eight legs (DSDP Legs 69, 70, 83, and92 andODP Legs 111, 137, 140, and148) between 1979 and (only seven of these eight legs were coring legs; Leg 92 returned to Hole 504B for downhole logging operations). The detail of operations can be consulted in the Site 504 chapters of these eight leg reports (Cann, Langseth, Honnorez, Von Herzen, White, et al, 1983;Honnorez, Von Herzen, et al, 1983;Anderson, Honnorez, Becker, et al, 1985;Leinen, Rea, et al, 1986;Becker, Sakai, et al, 1988;Becker, Foss, et al, 1992;Dick, Erzinger, Stokking, et al, 1992;Alt, Kinoshita, Stokking, et al, 1993). The full suite of operations in Hole 504B is summarized in Table T3, and major perturbing events are reported in Figure F8.…”

Section: Dsdp/odp Hole 504bmentioning

confidence: 99%

“…Times have sometimes been estimated based on average rates of penetration or on average pipe trip duration, as they were not always available in the operation section of the Site 504 chapter of the leg's Initial Reports volume (Cann, J.R., Langseth, M.G., Honnorez, J., Von Herzen, R.P., White, S. M., et al, 1983;Honnorez, J., Von Herzen, R.P., et al, 1983;Anderson, R.N., Honnorez, J., Becker, K., et al, 1985;Shipboard Scientific Party, 1986, 1992a, 1992b. Gray = beginning and end of legs, casing operations; blue = downhole measurements; green = coring; red = hardware failure and hole remediation.…”

Section: Proc Iodp | Volume 335mentioning

confidence: 99%

Deep drilling of intact ocean crust: harnessing past lessons to inform future endeavors

Teagle¹,

Ildefonse²,

Blum³

2012

Proceedings of the IODP

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“…LEG 100 -SHAKEDOWN CRUISE (JANUARY [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]1985) This first cruise departed Pascagoula, Mississippi, on 11 January 1985 and arrived in Miami, Florida, on 29 January 1985 after 18 days of testing all of the drilling systems and scientific laboratories and giving the drilling and scientific/technical crew an opportunity to train on their respective equipment. During this inaugural cruise, three holes were drilled at Site 625 near De Soto Canyon, west Florida Shelf, in order to correlate alternating sedimentary and erosive sequences to world-wide sea level changes over the last several million years.…”

Section: Science Operationsmentioning

confidence: 99%

“…The well is sited in 5.9 Ma crust near the East Pacific Rise, and has served as a "type section" of young oceanic crust (20). log curves.…”

Section: Case Studiesmentioning

confidence: 99%

Five Papers on the Ocean Drilling Program

1986

Ocean Drilling Program Technical Notes

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The Ocean Drilling Program (ODP) commenced its field operations in January 1985. Texas A&M University (TAMU), as Science Operator, has as its ultimate task to collect cores from the floor of the oceans and to ensure that adequate scientific analyses are performed on those samples. The Science Operator implements the science plans, provides logistical and technical support for the shipboard science team, manages postcruise activities and the long term curation and distribution of core samples, and coordinates, edits, and publishes the final research product. The scientific program uses a dynamically positioned commercial drillship, the JOIDES RESO-LUTION, which has a much more expansive research and drilling facility than previously employed for scientific ocean drilling. TAMU receives scientific guidance from an international scientific organization called the Joint Oceanographic Institutions for Deep Earth Sampling (JOIDES).The primary scientific objectives of the ODP lie in studying the origin and evolution of the oceanic crust, the tectonic evolution of the continental margins, the origin and evolution of marine sedimentary sequences, studies of long term changes in the atmosphere, oceans, cryosphere, biosphere, and magnetic field, and in the development of new tools and technology for deep ocean exploration and drilling. This paper describes the future science plans and an overview of the Ocean Drilling Program.

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Initial Reports of the Deep Sea Drilling Project, 83

Cited by 48 publications

References 0 publications

Seismic properties of layer 2 basalts

Seismic properties of layer 2 basalts

Deep drilling of intact ocean crust: harnessing past lessons to inform future endeavors

Five Papers on the Ocean Drilling Program

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