Correlation, frequency of emplacement and source directions of megaturbidites on the Madeira Abyssal Plain

Weaver, P. P. E.; Rothwell, R. G.; Ebbing, Jörg; Gunn, D. E.; Hunter, P.

doi:10.1016/0025-3227(92)90218-7

Cited by 135 publications

(130 citation statements)

References 14 publications

Supporting

Mentioning

128

Contrasting

Order By: Relevance

“…6). For example, volcaniclastic turbidites derived from the flanks of the Canary Islands are found in the MAP more than 1,000 km from source (Pearce and Jarvis., 1992;Rothwell et al, 1992;Weaver et al, 1992;Masson, 1996;Alibés et al, 1999).…”

Section: Landslide Deposits and Rise Sedimentationmentioning

confidence: 99%

Flank stability and processes off the western Canary Islands: a review from El Hierro and La Palma

Úrgeles¹,

Canals²,

Masson³

2001

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: The morphological characterisation of the western submarine island flanks of El Hierro and La Palma differentiates four type-zones that may give new insights into the evolution of oceanic island slopes. The different type-zones result from the interplay between constructive volcanic processes, hemipelagic settling and volcano collapses. The latter results in massive debris avalanche deposits, which form large volcaniclastic aprons. In most cases, the headwall scarps are clearly exposed on the emerged part of the islands. The events that occurred in the youngest and westernmost islands of El Hierro and La Palma have vertical runouts exceeding 6,000 m and volumes that can reach several hundred km 3 . The landslide frequency for the entire Canaries is one major event per 90 ka. Triggering mechanisms are closely related to magmatic processes. The increase in the shear stress is directly linked with the forceful intrusion of magma along "ridge-rift" systems, while in the western Canary Islands it seems that the main process reducing shear resistance may be related to the rise in pore pressure due to hydrothermal circulation.

show abstract

Section: Landslide Deposits and Rise Sedimentationmentioning

confidence: 99%

Flank stability and processes off the western Canary Islands: a review from El Hierro and La Palma

Úrgeles¹,

Canals²,

Masson³

2001

Sci. Mar.

View full text Add to dashboard Cite

show abstract

“…29,this volume), that were deposited at least as abundantly as in the intervals of 0-35 meters below seafloor (mbsf) reported earlier (e.g., Schminke, Weaver, Firth, et al, 1995;De Lange et al, 1987;Weaver and Rothwell, 1987;Weaver et al, 1992;Rothwell et al, Chap. 28, this volume).…”

Section: Resultsmentioning

confidence: 59%

High-resolution silica pore-water profiles in sediments of the Madeira Abyssal Plain, eastern North Atlantic

Lange¹

1998

Proceedings of the Ocean Drilling Program, 157 Scientific Results

View full text Add to dashboard Cite

High-resolution pore-water sampling has been undertaken to define the pore-water silica profile vs. depth for Holes 950A and 952A in the Madeira Abyssal Plain, eastern North Atlantic. The silica pore-water concentration in the upper 50 meters below seafloor (mbsf) faithfully records the presence of biogenic silica in organic-rich turbidites. Between 50 and 250 mbsf, that is, between 1 and 6.5 Ma, however, the silica pore-water concentration is low and stable, pointing to the absence of biogenic silica in the organic-rich turbidites in this interval. Such absence could indicate a change in source area, or in the northwest African upwelling system during that period.Near 280 mbsf in Hole 950A, and below 290 mbsf in Hole 952A, enhanced levels of silica are again observed in the pore waters, which indicates that biogenic silica is present in the deep organic-rich turbidites. For Hole 952A, this coincides with the interval where enhanced levels of diatoms have been reported. The high-resolution pore-water sampling in Holes 950A and 952A has resulted in the identification of potential intervals where authigenic silica phases are likely to have formed, thus enabling future studies on the diagenetic redistribution of silica in marine sediments.

show abstract

“…Kenyon 1987;Bugge et al 1988;Weaver et al 1992), and it is important to recognize that this must have been the case throughout the geological record. The paper by Nielsen et al describes a large slide on the north Faeroes margin which has an entirely infilled slide scar, and pre-dates the surface slide from the same region described in greater detail by Van Weering et al It is suggested that a change in the palaeoceanographic regime may have triggered the former event; if this was the case, then there was a direct relationship between changes in the alongslope regime and this large downslope event.…”

Section: Evans E T a Lmentioning

confidence: 99%

Geological processes on continental margins: sedimentation, mass-wasting and stability: an introduction

Evans

Stoker

Cramp

1998

View full text Add to dashboard Cite

Correlation, frequency of emplacement and source directions of megaturbidites on the Madeira Abyssal Plain

Cited by 135 publications

References 14 publications

Flank stability and processes off the western Canary Islands: a review from El Hierro and La Palma

Flank stability and processes off the western Canary Islands: a review from El Hierro and La Palma

High-resolution silica pore-water profiles in sediments of the Madeira Abyssal Plain, eastern North Atlantic

Geological processes on continental margins: sedimentation, mass-wasting and stability: an introduction

Contact Info

Product

Resources

About