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(Table 1) Paleomagnetic properties of specimens from DSDP Holes 69-504B and 7...
Paleomagnetic and rock magnetic measurements of basalt specimens from DSDP Hole 504B, associated with the Costa Rica Rift, have a mean natural remanence intensity (Jn) between 5... -
(Table 1) Physical properties of basalts from DSDP Holes 69-504B and 70-504B
A detailed study of physical properties was made on core samples from Deep Sea Drilling Project Hole 504B. The measured properties are density, porosity, sonic velocity,... -
(Table 1) Compressional-wave and shear-wave velocities and elastic constants ...
Shear-wave and compressional-wave velocities of 26 basalt samples collected at Site 504 during Deep Sea Drilling Project Legs 69 and 70 were measured at elevated confining... -
(Table 1) Physical properties of basalts from DSDP Legs 69 and 70
Physical properties of basalts from Deep Sea Drilling Project Sites 504 and 505, south of the Costa Rica Rift, including wet-bulk density, water content, sonic velocity, and... -
(Table 1) K-Ar age and inert-gas-isotopes at DSDP Holes 68-501, 69-504B and 6...
Conventional K-Ar ages have been determined and inert-gas abundances have been measured on representative samples of altered rocks from Deep Sea Drilling Project Holes 501,... -
(Table 2) Geochemistry of K-feldspars and associated plagioclase phenocrysts ...
Basalts from some holes of the Deep Sea Drilling Project contain secondary K-feldspar which forms pseudomorphs after calcic (>76% An) Plagioclase cores, whereas Plagioclase... -
(Table 1) Uranium at DSDP Hole 69-504B pore water
Basalt formation waters collected from Hole 504B at sub-basement depths of 194, 201, 365, and 440 meters show inverse linear relationships between 87Sr/86Sr and Ca, 87Sr/86Sr... -
(Table 1) Uranium at DSDP Hole 69-504B pore water
Measurements of U concentration and 234U/238U ratio were made in five water samples from Deep Sea Drilling Project Hole 504B.The results indicate that a loss of U had occurred... -
(Table 1) Water samples collected from basaltic basement at DSDP Holes 68-501...
The first attempts to sample formation waters from basaltic basement in the oceanic crust were made at Sites 501, 504, and 505 of the Deep Sea Drilling Project. Two methods were... -
(Table 1) Total and organic carbon in sediments at DSDP Holes 69-504 and 69-505
Sediments from Deep Sea Drilling Project Sites 504 and 505 near the Costa Rica Rift were examined by thermal methods. It was found that production index (P.I.) values, which... -
(Table 1) Mineralogical composition of sediments from DSDP Sites 69-504 and 6...
We discuss the provenance of minerals detected by X-ray-diffraction analyses of sediments of Sites 504 and 505 of Deep Sea Drilling Project Leg 69. These are X-ray-amorphous... -
(Figure 1) Silicoflagellates at DSDP Hole 69-504
Diverse and abundant late Miocene to Pleistocene silicoflagellates at DSDP Site 504 can be correlated by tropical biostratigraphic zones and relative paleotemperature values to... -
(Table 2) Estimated basement temperatures at DSDP Hole 69-504B
The achievement of deep penetration (562 m) of seafloor basalts at Hole 504B, near the Costa Rica Rift (1°13.63'N, 83°43.81'W), on DSDP Legs 69 and 70 presented a rare... -
(Table 1) Sample levels of diatom and silicoflagellate datums at DSDP Holes 6...
A standard biostratigraphic system, based upon diatom datum levels previously correlated to the paleomagnetic record, was applied to Deep Sea Drilling Project Sites 501/504 and... -
(Table 1) Comparisons of dynamic and static Young's moduli of basalt at DSDP ...
Compressional- and shear-wave velocity logs (Vp and Vs, respectively) that were run to a sub-basement depth of 1013 m (1287.5 m sub-bottom) in Hole 504B suggest the presence of... -
(Table 1) Strontium concentration and isotope ratios of carbonates from DSDP ...
Recent revisions of the geological time scale by Kent and Gradstein (in press) suggest that, on the average, Cretaceous magnetic anomalies are approximately 10 m.y. older than... -
Thallium concentrations and isotope composition of MORB glasses and altered o...
Hydrothermal fluids expelled from the seafloor at high and low temperatures play pivotal roles in controlling seawater chemistry. However, the magnitude of the high temperature... -
(Table 2) Bottom-hole temperature measurements at DSDP Sites 68-501, 69-504, ...
Drilling durin Deep Sea Drilling Project Legs 68, 69, and 70 on the southern limb of the Costa Rica Rift was used to study geothermal processes in the ocean crust. Two areas... -
87Sr/86Sr ratios, Sr and Rb concentrations and stable oxygen isotope values f...
Seventeen whole-rock samples, generally taken at 25-50 m intervals from 5 to 560 m sub-basement in Hole 504B, drilled in 6.2 m.y. old crust, were analysed for 87Sr/86Sr ratios,... -
(Table 1) Intensities and directions of natural remanent magnetization, initi...
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