Showing papers in "Marine Geology in 1974"

TL;DR: Breccias consisting of fragments of serpentinized peridotite in a carbonate cement were dredged abundantly from the slopes of transverse ridges existing at the offsets of the Mid Atlantic Ridge in the Romanche and Vema fracture zones as mentioned in this paper.

TL;DR: In this article, the authors established threshold erosion velocities for plane beds of pelagic red clay by ten experimental runs in a recirculating saltwater flume and showed that even with water content as high as 82%, observable erosion of the sediment required a velocity equivalent to a bottom current of about 30 cm/sec.

TL;DR: The distribution of rare earth elements and gold have been measured in surface sediments of cores collected along a traverse across the East Pacific Rise at approximately 39°S latitude as mentioned in this paper, and it is concluded that similar to iron, which also exhibits a maximum in crestal sediments, a fraction of the gold in these sediments has a volcanogenic source.

TL;DR: In this article, a terraced segment (at 37 m) of the central New Jersey shelf is shown to have two morphological orders of ridge and trough topography: (1) a first-order system with ridges to 14 m high, 2-6 km apart, in a Z-shaped pattern trending to the NNE, and (2) a secondorder system 2-5m high, 0.5-1.5 km apart and trends to the NE.

TL;DR: The pteropodal (aragonite) lysocline corresponds to the 3200m isobath as discussed by the authors, which is the upper limit of the Antarctic Bottom Water.

TL;DR: In this paper, five fresh, two weathered, and two metamorphosed basalt basalt pillows with a presently or originally glassy outermost layer, together with a weathered and a metamorphized basalt fragment without an original glassy layer, all from the Mid-Atlantic Ridge, were investigated in detail.

TL;DR: In this paper, a new view of the mid-ocean Quaternary eustatic terraces is presented, especially related to the most recent marine history of Oahu.

TL;DR: Samples from the active Reykjanes Ridge and the inactive Iceland-Faroes Ridge have been investigated sedimentologically, mineralogically, and geochemically as mentioned in this paper, and bulk chemical analyses indicate that the ridge sediments appear to be enriched in Fe, Mn, Cu, Cr, and Zn as has been reported for other active ridge metal contributions.

TL;DR: In this paper, the authors explain the unreliability of radiocarbon ages obtained on the organic-carbon fraction of marine sediments stored wet and over a long period as a consequence of bacterial up-take of recent CO2.

TL;DR: In this paper, the total thickness of sediments and thickness of the semiconsolidated section have been mapped in the southern Barents Sea, where the main part consists of Mesozoic and Paleozoic sediments, while the areas near the shelf edge show a westward increasing wedge of Cenozoic deposits above the same sediments found to the east.

TL;DR: The measured ages of the corals, which are in agreement with radiocarbon ages, fall in three groups, 6,000, 30,000 and 120,000 years before present.

TL;DR: In this paper, it is proposed that down-wall slumps are transformed to debris flow in the axis, and the latter serves as the canyon head flushing mechanism, which is the major process in a canyon head in terms of sediment volume displaced.

TL;DR: Offshore drilling and coring together with high-resolution seismic surveys have established that the southern Irish Sea was extensively glaciated during the Devensian stage, before competing with local Welsh ice in Cardigan Bay as mentioned in this paper.

TL;DR: The continental margin of Western Australia is a rifted or “Atlantic”-type margin, with a complex physiography, including a shelf, an upper and lower continental slope, marginal plateaus, a continental rise, and rise or lower slope foothills as mentioned in this paper.

TL;DR: An 8.5 m long apparently undisturbed core from a hilltop on the crest of the East Pacific Rise has uranium and thorium isotope distributions that are very unusual as discussed by the authors.

TL;DR: Heck and Heckle seamount chains are seamounts that form near the spreading center on Juan de Fuca Ridge and do not continue to grow as they are carried away by sea-floor spreading as discussed by the authors.

TL;DR: The structure of the continental shelf off southern Morocco was studied by means of 2,100 km of seismic reflection profiles, magnetic and bathymetric surveys, and dredge samples as mentioned in this paper.

TL;DR: The relationship of the Cretaceous igneous activity to the evolution of the North Atlantic Ocean is discussed briefly in this article, where aegirine granite is used as petrography and chemistry of the microgabbros.

TL;DR: In this paper, a biostratigraphic record in three piston cores from the Samoan Passage suggests that the flow of the deep western boundary current through the passage was substantially intensified at some time between the Early Eocene and Early Oligocene.

TL;DR: The velocities of near-bottom currents were measured at six locations on a 180-km transect of the Gulf Stream adjacent to Cape Hatteras in this article.

TL;DR: This paper showed that pebbles with attached algae can be easily transported by oscillatory water movements, if the ratio weight of pebble/(wet weight of algae) is less than or equal to about 3.

TL;DR: In this paper, an evaluation of the surficial sediment distribution patterns, cores, direct visual observations of the sea floor made in 24 submersible dives and tight-grid seismic survey data was made.

TL;DR: In this article, correspondence analysis of the sand fraction of Pleistocene sediments leads to the differentiation of two facies, that are readily compared and identified with the above-mentioned Holocene sedimentary facies.

TL;DR: In this paper, textural, mineralogical and chemical studies of surface and subsurface sediments from 80 stations in the southwestern Barents Sea were performed and a combined analysis of the mineralogy and chemistry of the separated size fractions allowed the recognition of petrographic provinces.

TL;DR: A sampling survey in the Ligurian Sea and north of the Balearic Islands (Mediterranean Sea) brought back samples containing the following elements: (1) lithified Quaternary crust and deep-lying corals; (2) Early Pliocene marls corresponding to reflector level M in some cases; (3) red sediments tentatively assimilated with the Messinian continental equivalent; (4) rocks coming from the basement; (5) volcanic rocks.

TL;DR: In this paper, a new type of abyssal tholeiites characterized by CaO Na 2 O ratios lower than those of ordinary abyssal leiites were found on both the north and south walls of the Puerto Rico Trench.

TL;DR: In this paper, a grid of narrow-beam bathymetric and geophysical profiles in oceanic crust of Cretaceous age near 23°N latitude, 31°W longitude was delineated in a 185 × 185km area by an 18.5 × 18.9km grid of bathymetry and geophysics profiles.