Abstract Oceanic core complexes (OCCs) and detachment faults play a key role in crustal accretion at slow ultraslow spreading centers. We investigated the effect of different magma supply three OCCs Southwest Indian Ridge using high-resolution deep-sea bathymetric magnetic data. The average equivalent thickness extrusive basalt deduced from anomalies, proxy for supply, decreases west to east, Y...

[1] High-resolution images of the walls exposed in Valles Marineris reveal variations in appearance and degree of layering indicating various lithologies comprise the Tharsis plateau. The layered wall rock has been proposed to result from effusive flood basalt volcanism or interbedded sediments and volcanics. We present observations of unlayered rock that indicate layering extends to a greater ...

Introduction: Mare ridge ring structures (MRRSs) are deformed surface features and have long been studied on the floors of the maria since the early exploration of the Moon [1, 2, 3]. They are ridge segments having the form of rings (circular, elliptical or irregular in shape) with the size varing from 1-2 km to over 80 km in diameter [1]. The analogical structures were also found in the northe...

1. The carnivorous ciliate Didinium nasutum discharged its extrusive organelles when a strong inward current was injected into the cell in the presence of external Ca ions. 2. In the absence of external Ca ions, the strong inward current produced fusion of the apex membrane of the proboscis. 3. External application of Ca ions after the fusion of the apex membrane produced discharge of the organ...

Abstract In the Lac de Gras (LDG) kimberlite field, Northwest Territories, Canada, coherent kimberlites (CKs) occur as tabular dykes, pipe-shaped diatremes, and irregular bodies without well-defined geometries. Combining morphology of CK with occurrence fragmented olivine microcrysts allows distinction four types at LDG: (1) dykes no broken olivine; (2) but probable sheet geometry (3) pipe-fill...

The surface of Mercury has been heavily modified by impact cratering and volcanic plains since the initial formation of its lithosphere and crust. As in the case of the Moon, the origin of early plains deposits has been difficult to determine because ponded impact basin ejecta and impact melt deposits can mimic the topography and texture of extrusive volcanic plains. In order to understand bett...

The Precambrian Dullstroom Formation of South Africa, which is predominantly composed of basaltic andesites interbedded with subordinate sedimentary and felsic volcanic strata, represents the ®rst phase of an extended period of magmatism that was responsible for the Bushveld Magmatic Province, including the extrusive Rooiberg Group and the intrusive Bushveld Complex. New geochemical and isotopi...

Mass-transport complexes (MTCs) form a significant component of the stratigraphic record in ancient and modern deep-water basins worldwide. One such basin, the deep-marine margin of eastern offshore Trinidad, situated along the obliquely converging boundary of the Caribbean and South American plates and proximal to the mouth of the Orinoco River, is characterized by catastrophic shelfmargin pro...