Showing papers in "Earth and Planetary Science Letters in 1974"

TL;DR: In this paper, the stable carbon isotope fractionation between gaseous CO 2 and dissolved bicarbonate has been measured from 5 to 25°C by a method of high precision.

TL;DR: In this paper, it was shown that highland samples from widely separated areas bear the imprint of an event or series of events in a narrow time interval which can be identified with a cataclysmic impacting rate of the moon at about 3.9 aeons.

TL;DR: A linear relationship between the sea floor depth and the square root of age has been found for ocean lithosphere spreading from mid-ocean ridges as discussed by the authors, but there is a variation in the gradient along the ridge on a fine scale (up to 20% over 200 km).

TL;DR: In this article, a composite property, 9NO 3 + O 2, is proposed as a conservative water-mass tracer, which is chosen so that the increase in "NO" resulting from nitrate introduction during respiration just balances the consumption of dissolved oxygen gas.

TL;DR: The Eolian arc is located at the boundary between the converging African and European plates and its volcanism is characterized by a marked evolution in a restricted time (less than 1 my). A progressive transition is observed from typical calc-alkaline series toward shoshonitic rocks produced by past and present activity.

TL;DR: In this paper, the solubility of ferrous iron and olivine in basaltic liquids has been determined from experiments conducted in equilibrium with metallic iron at temperatures of 1150° to 1306°C and oxygen fugacities of log −12.5to−14.5atm.

TL;DR: Carbon and oxygen isotope analyses on shells of freshwater molluscs and their habitat were presented in this paper, and the data obtained reconfirm the usefulness of such 18 O analyses for paleoenvironmental and paleohydrological studies.

TL;DR: Based on petrographic and chemical data, four types of basaltic rocks were recognized: (1) picritic basalts with olivine xenocrysts, Ti02 inf 0.6-0.8-1.5%, K20=0.1- 0.3%, and (4) pyroxene basalts, pyroxen plagioclase, etc. as discussed by the authors.

TL;DR: In this paper, phase equilibria in a portion of the system forsterite-plagioclase (An50Ab50 by weight)-silica-H2O have been determined at 15 kbar pressure under H2O-saturated conditions.

TL;DR: In this article, the effect of dissolved salts on the oxygen isotope activity ratio of water has been extended to 275°C by adding dehydrated salts to water of known isotope composition and the solutions were sampled for analysis.

TL;DR: In this paper, an approximate equality between layer thickness and spacing of major fractures observed in some sedimentary rocks and clay cake models was shown to extend to the "mega-joints" that have fractured the lithosphere and controlled volcano spacing on the earth, and possibly on Mars.

TL;DR: In this paper, the authors show that Sicily is part of the African plate, which collided with the European continental plate in Middle Miocene times, and that the two plates started to converge with consequent consumption of oceanic crust.

TL;DR: The skeletal banding observed in vertical cross-sections of two species of coral,Montastrea annularis from Jamaica andDiploria labrynthiformis from Bermuda, has been confirmed to be annual by ingrowth of228Th towards radioactive equilibrium with228Ra taken up from seawater as discussed by the authors.

TL;DR: In this article, the ages of the outer edges of the Rift Valley are estimated to be 1.3 and 1.7 m.y.y for the eastern and western sides respectively.

TL;DR: In this article, an abrupt change from light Re-enriched to depleted patterns is observed in the boundary of the middle and upper series of the Faeroes Plateau basalt.

TL;DR: In this paper, the authors used the K-Ar method to date five islands of the Marquesas Island chain (southeast Pacific Ocean) and exhibit a northwest to southeast volcanic migration rate of 9.9 cm/yr, which is consistent with the model of rigid Pacific plate movement over a fixed hot spot or mantle plume.

TL;DR: In this paper, it was shown that the height of young oceanic volcanoes above the basaltic basement is limited by plate thickness rather than the speed of a plate over a hot spot or the hot spot's productivity.

TL;DR: A provisional outline of tectonic and volcanic events in the Peruvian Andes during the Cenozoic includes: one or more pulses of igneous activity and intense deformation during the Paleocene and Eocene; a period of quiescence, lasting most of Oligocene time; reinception of Tectonism and volcanism at the beginning of the Miocene; and a major pulse of deformation in the Middle Miocene accompanied and followed through the Pliocene by intense volcanism and plutonism.

TL;DR: In this article, the authors presented radiocarbon data for 11 stations and tritium data for 16 stations in the North Atlantic Ocean from 74°N to 3°N.

TL;DR: In this paper, it is suggested on the basis of palaeogeographical, palaeontological and tectonic evidence that Asia did not fuse completely until well into the Mesozoic.

TL;DR: Experimental data on the stability of titan-phlogopite [K 2 Mg 4 TiAl 2 Si 6 O 20 (OH) 4 ] are presented in this paper.

TL;DR: In this article, a trace element analysis of greenstones from the Grong, Lokken, Storen and Stavenes areas of central and southern Norway indicates the presence of ocean floor type basalts in all four areas, and lowpotassium tholeiites of island arc affinity in at least two of the areas.

TL;DR: In this paper, the authors used a quasi-steady-state equilibrium with atmospheric CO2 at a mean temperature of 16°C and showed that these waters are derived from a mixture of North Atlantic deep water and equilibrated surface water.

TL;DR: In this article, a vertical diffusion-advection model with a scavenging removal rate which is first-order in concentration is applied to the deep-water Geosecs-I profiles of four trace metals.

TL;DR: In this paper, it is suggested that consolidation-rate is a major factor influencing the NRM intensity in deep-sea sediments, and a positive correlation between NRM-intensities and water temperature during deposition is discussed.

TL;DR: In this paper, the ages of the lower boundaries of New Zealand Pleistocene marine Substages are 0.45 m.y.y., 1.06m.y, 1.55 m.m., and 1.86 m.h.y on the basis of sedimentation rates.

TL;DR: In this paper, the distribution patterns of rare-earth element (REE) distribution patterns have been determined for samples of Amitsoq gneiss from the Godthab and Isua areas.

TL;DR: McGetchin et al. as discussed by the authors proposed an extension to a quantitative scheme developed by T. R. McGetchin (1973) for predicting the distribution of ejecta from lunar basins.