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Physical properties of Hole 69-504B
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Physical properties of Hole 69-504A
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Physical properties of Hole 69-504
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Major, trace and rare earth elements and minerals at DSDP Legs 69-70 Holes
We obtained major and trace element data on 113 samples from basalts drilled during DSDP Legs 69 and 70 in the Costa Rica Rift area. The majority have major and trace element... -
Geochemistry of minerals at DSDP Hole 70-504B
Hole 504B, drilled into the 5.9 Ma crust of the southern flank of the Costa Rica Rift, tapped a hydrothermal system in its conductive stage. Three alteration zones were... -
Geochemistry of minerals at DSDP Holes 68-501 and 69-504B
The interaction of seawater with basalts in DSDP Hole 501 and the upper part of Hole 504B (Costa Rica Rift) produced oxidative alteration and a zonation of clay minerals along... -
(Table 2) Lithium concentration and isotopic composition of smectites from OD...
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(Table 1) Lithium concentration and isotopic composition of rocks from DSDP/O...
Further d18O data see Alt et al. (1986) datasets: doi:10.1594/PANGAEA.713298 and Alt et al., (1989) datasets: doi:10.1594/PANGAEA.713302 -
Geochemistry of the oceanic crust from ocean drilling samples
This book presents new data on chemical and mineral compositions and on density of altered and fresh igneous rocks from key DSDP and ODP holes drilled on the following main... -
Chemical composition and sulfur-isotope ratios in DSDP Legs 69-and 70
As part of the geochemical-petrological study of basalts recovered from DSDP Hole 504B (Leg 70) on the southern flank of the Costa Rica Rift, we investigated specially the... -
Geochemistry and minerals at DSDP Legs 68-70 Holes
The compositions of natural glasses and phenocrysts in basalts from Deep Sea Drilling Project Sites 501, 504, and 505, near the Costa Rica Rift, constitute evidence for the... -
Modes of occurrence and geochemistry at DSDP Holes 69-505A and 69-505B
The compositions of chrome spinels of Costa Rica Rift basalts from Deep Sea Drilling Project Site 505 vary depending on their occurrences as (1) inclusions in olivine crystals,... -
Major- and trace-elements at DSDP Legs 68-70 Holes
The basalts recovered from the Costa Rica Rift by drilling at Deep Sea Drilling Project Sites 501, 504, and 505 during Legs 68, 69 and 70 of the Glomar Challenger are the most... -
Geochemistry at DSDP Sites 69-505, 69-504 and 70-504
Deep basement penetration during Legs 69 and 70 at Hole 504B in the Panama Basin allowed the recovery of a 561.5-meter sequence of basaltic pillows, thin flows, and breccias... -
Chemiscal composition of basalts from DSDP Legs 69 and 70 Holes
Chemical compositions and 1-atm. phase relations were determined for basalts drilled from Holes 501, 504A, 504B, 505, and 505B on Legs 68, 69, and 70 of the Deep Sea Drilling... -
Magnetic properties of basalts from DSDP Hole 69-504B
The NRM intensity, AF demagnetization characteristics, hysteresis parameters, initial susceptibility, and thermomagnetic characteristics of 18 basalt specimens from Deep Sea... -
Magnetic properties and geochemistry in DSDP Holes 69-504B an d 69-505B
More than 60 basalt samples from two Deep Sea Drilling Project holes on the Costa Rica Rift were studied for magnetic properties and were found to have no properties... -
Strontium- and lead-isotope composition of some basalts at DSDP Hole 69-504B
Seventeen whole-rock samples, generally taken at 25- to 50-meter intervals from 5 to 560 meters sub-basement in Deep Sea Drilling Project Hole 504B, were analyzed for 87Sr/86Sr... -
Sulfide petrology of basalts at DSDP Holes 69-504B and 69-505B
Primary sulfide mineralization in basalts of the Costa Rica Rift occurs mainly in chrome-spinel-bearing olivine tholeiites. Primary sulfides form both globules, consisting of... -
Geochemistry and minerals at DSDP Hole 70-504B
In three veins from the lower part of Deep Sea Drilling Project Hole 504B, 298 meters below the top of basement, primary augite is replaced by aegirine-augite. This...
