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Sample descriptions, d-spacing and geochemistry at DSDP Holes 68-501 and 69-504B
Mössbauer analyses were conducted on a sample of saponite selected from DSDP Leg 69 basalt core. The sample was initially placed within a nitrogen-purged container on-board... -
Secondary minerals and geochemistry at DSDP Legs 68 and 69
Basalt samples recovered during DSDP Legs 68, 69, and 70 from a 550-meter-thick section in two holes near the Costa Rica Rift (Holes 501 and 504B) were found to contain the... -
Geochemistry at DSDP Hole 69-504B
Cores from Deep Sea Drilling Project Holes 501, 504B and 505B have an unusual near-vein zonation in basalts. Megascopically, zonation occurs as differently colored strips and... -
Geochemistry and effect of oxidation state of iron at DSDP Leg 69 Holes
Over 300 electron microprobe and wet chemical analyses were made of alteration minerals (mostly clays) in basalts from DSDP Sites 501, 504, and 505 in the Costa Rica Rift. These... -
Composition of sediment pore water and isotopes in carbonate and benthic fora...
Two sites on the southern flank of the Costa Rica Rift were drilled on DSDP Legs 68 and 69, one on crust 3.9 m.y. old and the other on crust 5.9 m.y. old. The basement of the... -
Oxygen and carbon isotopes of planktic foraminifera and ageprofile datum desc...
A detailed oxygen isotope record (resolution: about 2500 years) has been obtained for the Pleistocene sediments at Hole 504. Preliminary measurements made deeper in the section... -
δ¹⁸O, lithologies, mineralogy and determination of temperature and depth of f...
Seven opal-CT-rich and five quartz-rich porcellanites and cherts from Site 504 have a range in oxygen-isotope values of 24.4 and 29.4 per mil. In opal-CT rocks, d18O becomes... -
Petrology and geochemistry of silicified upper Miocene chalk at DSDP Site 69-504
Chert, Porcellanite, and other silicified rocks formed in response to high heat flow in the lower 50 meters of 275 meters of sediments at Deep Sea Drilling Project Site 504,... -
Geochemistry, grain-size distribution and smear slide abundances at DSDP Hole...
Rapidly deposited Miocene and younger siliceous and calcareous sediments at Sites 504 and 505 in the central Panama Basin near the eastern end of the equatorial high... -
Calcium carbonat content and stratigraphic correlation of ODP Leg 111 sites a...
The recovery of continuous sedimentary sequences has been and is a high-priority goal of the Ocean Drilling Program, yet its success has not been determined. We test the... -
Chemical and mineral compositions of basalts from the Pacific Ocean, DSDP data
Mineral and chemical alterations of basalts were studied in the upper part of the ocean crust using data of deep-sea drilling from D/S Glomar Challenger in the main structures... -
Lithium concentrations and isotope composition of basalt samples from ODP/DSD...
Ocean Drilling Program (ODP) Hole 504B near the Costa Rica Rift is the deepest hole drilled in the ocean crust, penetrating a volcanic section, a transition zone and a sheeted... -
Strontium, oxygen and hydrogen isotope ratios of basalts from DSDP Hole 504B
DSDP Hole 504B was drilled into 6 Ma crust, about 200 km south of the Costa Rica Rift, Galapagos Spreading Center, penetrating 1.35 km into a section that can be divided into... -
Geochemistry, and Nd- and Pb-isotopic composition of basalts from the upper o...
The DSDP/ODP Hole 504B, drilled in the 5.9 Ma southern flank of the Costa Rica Rift, represents the deepest section through modern ocean floor basaltic basement. The hole... -
(Table 12) Geochemistry and minerals of clinopyroxenes at DSDP Hole 69-504B
Structural formulae calculated on the basis of 6 oxygens. -
(Table 11) Geochemistry of plagioclases at DSDP Legs 68-70
Structural formulae calculated on the basis of 32 oxygens. -
(Table 10) Geochemistry of olivine at DSDP Legs 68-70
Structural formulae calculated on the basis of 4 oxygens. -
(Table 7) Geochemistry of clinopyroxenes at DSDP Legs 69-70 Holes
Structural formulae calculated on the basis of 6 oxygens. Empty cells mean no data. -
(Table 6) Geochemistry of plagioclases at DSDP Legs 69-70 Holes
Structural formulae calculated on the basis of 32 oxygens. -
(Table 5) Geochemistry of olivines at DSDP Holes 70-504B and 69-505B
Number of cations on the basis of 4 oxygens. Empty cells mean no data.
