scholarly journals Geology of the northeastern flank of Apollinaris Mons, Mars: Constraints on the erosional history from morphology, topography, and crater populations

Icarus ◽  
2019 ◽  
Vol 333 ◽  
pp. 385-403 ◽  
Author(s):  
Frank C. Chuang ◽  
David A. Crown ◽  
Daniel C. Berman
Keyword(s):  
Northeastern Flank

scholarly journals Seabed litter distribution in the high seas of the Flemish Pass area (NW Atlantic)

2020 ◽  
Vol 84 (1) ◽  
pp. 93
Author(s):  
Ana García-Alegre ◽  
Esther Román-Marcote ◽  
Jesús Gago ◽  
Gonzalo González-Nuevo ◽  
Mar Sacau ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Bottom Trawl ◽  
Northwest Atlantic ◽  
Marine Litter ◽  
Fishing Gears ◽  
National Jurisdiction ◽  
Baseline Information ◽  
Northeastern Flank ◽  
Using Data ◽  
The Eu

Seabed litter of the Flemish Pass area (NW Atlantic Ocean) was analysed and described using data from the EU-Spain groundfish survey (2006-2017 period). This study presents baseline information on seabed litter in this area. The Flemish Pass is located in areas beyond national jurisdiction within the Northwest Atlantic Fisheries Organization Regulatory Area Division 3L. A total of 1169 valid bottom trawl hauls were analysed (104-1478 m depth). Litter was found in 8.3% of the hauls, with mean densities of 1.4±0.2 items km–2 and 10.6±5.2 kg km–2. An increasing pattern with depth was found, the highest densities of seabed litter being identified in the deepest areas located in the Flemish Pass channel and down the northeastern flank of the Grand Bank. Fishing was found to be the main source of marine litter, and 61.9% of the hauls with litter presence showed litter included in the fisheries-related litter category. Whereas in most cases the litter was composed of small fragments of rope, in other cases it was composed of entire fishing gears such as traps. Plastics, metal and other anthropogenic litter were the next most abundant categories, accounting for 18.6%, 16.5% and 12.4% of the total, respectively.

Seismological features of the Pernicana–Provenzana Fault System (Mt. Etna, Italy) and implications for the dynamics of northeastern flank of the volcano

2013 ◽  
Vol 251 ◽  
pp. 16-26 ◽  
Author(s):  
S. Alparone ◽  
O. Cocina ◽  
S. Gambino ◽  
A. Mostaccio ◽  
S. Spampinato ◽  
...  
Keyword(s):  
Fault System ◽  
Mt Etna ◽  
Northeastern Flank

A Middle Ordovician Drowning Unconformity on the Northeastern Flank of the Okcheon (Ogcheon) Belt, South Korea

2005 ◽  
Vol 8 (4) ◽  
pp. 511-528 ◽  
Author(s):  
In-Chang Ryu ◽  
Chang Whan Oh ◽  
Sung Won Kim
Keyword(s):  
South Korea ◽  
Middle Ordovician ◽  
Northeastern Flank ◽  
Drowning Unconformity

Metasomatic and Intrusive nepheline-bearing rocks from the Mbozi syenite-gabbro complex, southwestern Tanzania

1968 ◽  
Vol 5 (3) ◽  
pp. 387-419 ◽  
Author(s):  
P. W. G. Brock
Keyword(s):  
Volume Change ◽  
Nepheline Syenite ◽  
Color Index ◽  
Ring Structure ◽  
Standard Cell ◽  
Volatile Elements ◽  
Alkaline Rocks ◽  
Northeastern Flank ◽  
Basic Rocks

The Mbozi Complex (20 × 8 miles) is situated on the Great North Road 15 miles east of the Tanzania–Zambia border. It is at least 743 million years old, and is emplaced in Ubendian Gneisses (1800 m.y.) along the northeastern flank of the Tunduma Rift.The oldest rocks in the complex are layered calcic gabbros, with cumulates of iron-rich pyroxenite and bytownite anorthosite. The basic rocks were faulted and deformed prior to the emplacement of alkaline rocks around the perimeter of the complex. The alkaline rocks are saturated with respect to silica near the ends of the complex, but are nepheline-bearing near the center. The larger masses of marginal syenite are magmatic intrusions.Within the basic rocks near the center of the complex is an elliptical zone of feldspathoidal rocks surrounding a core of unaltered gabbro. The rocks in this ring structure are heterogeneous, ranging in composition from slightly altered gabbro, through all intermediate compositions to ijolite, litchfieldite, and rutterite. They have well-developed concentric banding, but vary rapidly in composition and texture along and across strike. Contacts are gradational. The majority of the ring rocks appear to be metasomatized gabbros, but a few persistant, concordant bands of homogeneous litchfieldite are probably intrusive.Assuming no volume change and little change in color index, metasomatism of gabbroic rocks to produce the ring rocks would involve introduction of cations to the standard cell of 160 O ions in the proportion K5 – 9 Na21 – 27 Al−2 – +5 Si−5 – +11 P0 – +4 and removal of Ca14 – 21 Mg11 – 15 Fe2 – 4Ti1 – 2.It is concluded that the ring structure developed above a volatile-rich nepheline syenite, and that the metasomatism was effected by the volatile elements of that magma.

scholarly journals Landslide hypothesis for the origin of Haleakala volcano's crater and great valleys, Hawaii

Geosphere ◽  
2021 ◽  
Vol 17 (5) ◽  
pp. 1405-1421
Author(s):  
Kim M. Bishop
Keyword(s):  
Slope Failure ◽  
Rift Zone ◽  
Hawaiian Island ◽  
Summit Crater ◽  
Annual Rainfall ◽  
Fluvial Erosion ◽  
Lateral Margins ◽  
Northeastern Flank ◽  
Valley Incision ◽  
Giant Landslide

Abstract Active Haleakala volcano on the island of Maui is the second largest volcano in the Hawaiian Island chain. Prominently incised in Haleakala's slopes are four large (great) valleys. Haleakala Crater, a prominent summit depression, formed by coalescence of two of the great valleys. The great valleys and summit crater have long been attributed solely to fluvial erosion, but two significant enigmas exist in the theory. First, the great valleys of upper Keanae/Koolau Gap, Haleakala Crater, and Kaupo Gap are located in areas of relatively low annual rainfall. Second, the axes of some valley segments are oblique for long distances across the volcanic slopes. This study tested the prevailing erosional theory by reconstructing the volcano's topography just prior to valley incision. The reconstruction produces a belt along the volcano's east rift zone with a morphology that is inconsistent with volcanic aggradation alone, but it is readily explained if it is assumed the surface was displaced along scarps formed by a giant landslide on Haleakala's northeastern flank. Although the landslide head location is well defined, topographic evidence is lacking for the toe and lateral margins. Consequently, the slope failure is interpreted as a sackung-style landslide with a zone of deep-seated distributed shear and broad surface warping downslope of the failure head. Maximum downslope displacement was likely in the range of 400–800 m. Capture of runoff at the headscarps formed atypically large streams that carved Haleakala's great valleys and explains their existence in low-rainfall areas and their slope-oblique orientations. Sackung-style landslides may be more prevalent on Hawaiian volcanoes than previously recognized.

scholarly journals Terrestrial cosmogenic surface exposure dating of glacial and associated landforms in the Ruby Mountains-East Humboldt Range of central Nevada and along the northeastern flank of the Sierra Nevada

Geomorphology ◽  
2016 ◽  
Vol 268 ◽  
pp. 72-81 ◽  
Author(s):  
Steven G. Wesnousky ◽  
Richard W. Briggs ◽  
Marc W. Caffee ◽  
F.J. Ryerson ◽  
Robert C. Finkel ◽  
...  
Keyword(s):  
Sierra Nevada ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Ruby Mountains ◽  
Northeastern Flank ◽  
East Humboldt Range

Crustal structure on the northeastern flank of the Kenya rift

1994 ◽  
Vol 236 (1-4) ◽  
pp. 271-290 ◽  
Author(s):  
C. Prodehl ◽  
A.W.B. Jacob ◽  
H. Thybo ◽  
E. Dindi ◽  
R. Stangl
Keyword(s):  
Crustal Structure ◽  
Kenya Rift ◽  
Northeastern Flank

Magnetic Fabric-based Reconstruction of the Paleowind Direction from a Loess Sequence in the Northeastern Flank of the Qilian Mountains

2007 ◽  
Vol 50 (4) ◽  
pp. 1005-1010 ◽  
Author(s):  
Yong WANG ◽  
Bao-Tian PAN ◽  
Hong-Shan GAO ◽  
Qing-Yu GUAN ◽  
Ying-Ying CHEN ◽  
...  
Keyword(s):  
Qilian Mountains ◽  
Magnetic Fabric ◽  
Northeastern Flank ◽  
The Qilian Mountains
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