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Geologic and geophysical study of the Scotia Arc: The Southern ridge of the Scotia area
Entry ID: CNDA-ESP_SCOTIA-92-HE003


Summary
Abstract: In English:

The objectives of this campaign were:

-Transition among different plates and sub-plates; Shetland, Drake, Scotia
and Antarctic and their joint points.

-Study of the link between the Bransfield spreading centre of and the South
Shetlands subduction zone.

-Detailed morphostructural analysis of a shear plate boundary and
one of the biggest intracrest depressions (Hesp?rides Deep), by
means of the multibeam probe.

-Establishment of geomagnetic guidelines in the Bransfield
spreading zone in the shear's plate boundaries.

-Study of the formation of regional infilling and discontinuities
in the basins adjacent to the ridge.

-Application of the studied models in the international working
plans on oceanic ridges (Interidge project).

Data obtained:

-More than 1500 km of multichannel seismics
-3500 km of multibeam probes
-3500 km of hydrographic sounding
-3500 km of geomagnetic data

It was recognised with 100% insoundification an intracrest depression of the
South Scotia Ridge, it was called Hesperides Deep in honours of the RV
Hesperides in its first Antarctic campaign.

-Study of the Bransfield Strait, a semi-graben with recent activity
and neovolcanic crests indicative of an initial process of
sea-floor spreading.

-The South Scotia ridge was recognised, being established its
morphoestructure.

-Establishment of the seismotectonic character of the Scotia Plate
and the Powell Basin.

-It was showed the origin of the pull-apart basin of the Hesperides
Deep and the important compression-subduction component of the Scotia
Plate over the ridge.

En Español:

Los objetivos de la campaña fueron:

-Transición entre diferentes placas y sub-placas; Shetland,
Drake, Scotia y Antártica y sus puntos de unión.

-Estudio del enlace entre el centro de expansión de Bransfield y
la zona de subduccIón de las Shetlands del sur.

-Análisis morfoestructural detallado de un borde de placas
cizallante y de una de las grandes depresiones intracrestas (fosa
Hespérides), mediante la utilización de las sondas multihaz.

-Establecimiento de pautas geomagnéticas en la zona de
expansión de Bransfield y en los bordes de placas cizallantes.

-Estudio de la formación de rellenos y discontinuidades
regionales en las cuencas adyacentes a la dorsal.

-Aplicación de los modelos estudiados dentro de los planes de trabajo
internacionales en dorsales Oceánicas (proyecto InterRidge).

Datos Obtenidos
- Más de 1.500 km de sísmica multicanal
- 3.500 km de sondas multihaz
- 3.500 km de sondador Hidrográfico
- 3.500 km de datos geomagnéticos

Se reconoció con insonificación al 100% una depresión
intracresta, de lA Dorsal Sur de Scotia , denominándola FOSA
HESPERIDES en honor del B/O hesperides en su primera campaña
Antártica.

-Estudio del Estrecho de Bransfield , un Semi-Graben con actividad reciente
y crestas neovolcánicas indicativas de un proceso inicial de Sea-floor
spreading.

-Se reconoció La Dorsal sur de Scotia, estableciendose su
Morfoestructura

-Establecimiento del caracter sismotectónico de la Placa Scotia y Cuenca
de Powell.

-Se puso de manifiesto el origen de cuenca Pull-apart de la Fosa
Hesperides y de la importante componente de
compresión-Subducción de la placa Scotia bajo la Dorsal.

Related URL
Link: VIEW PROJECT HOME PAGE
Description: In English: Information on the vessel's Hesperides,
oceanographic expeditions can be found on this page. The information
includes a summary of the scientific results, participating agencies,
and other data.
En Español: En esta página se encuentra información
sobre la campañas realizadas por el Buque Oceanográfico
Hespérides: Resumen de los resultados científicos, organismos
participantes y otros datos.


Geographic Coverage
 N: -59.0 S: -64.0  E: -48.0  W: -62.0

Temporal Coverage
Start Date: 1992-02-06
Stop Date: 1992-02-24


Location Keywords
CONTINENT > ANTARCTICA > ANTARCTIC PENINSULA > SCOTIA SEA > SOUTH SHETLAND ISLANDS > ELEPHANT ISLAND
GEOGRAPHIC REGION > POLAR


Science Keywords
ATMOSPHERE >ATMOSPHERIC PRESSURE >ATMOSPHERIC PRESSURE MEASUREMENTS    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE TEMPERATURE >AIR TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >WATER VAPOR    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >SOLAR RADIATION    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >SEAFLOOR TOPOGRAPHY    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >CONTINENTAL MARGINS >CONTINENTAL SHELVES    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >FRACTURE ZONES    [Definition]
OCEANS >MARINE GEOPHYSICS >MARINE GRAVITY FIELD    [Definition]
OCEANS >MARINE GEOPHYSICS >MARINE MAGNETICS    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >OCEAN PLATEAUS/RIDGES    [Definition]
OCEANS >MARINE VOLCANISM >RIFT VALLEYS    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >TRENCHES    [Definition]
OCEANS >OCEAN OPTICS >FLUORESCENCE    [Definition]
OCEANS >OCEAN TEMPERATURE >WATER TEMPERATURE    [Definition]
OCEANS >SALINITY/DENSITY >CONDUCTIVITY    [Definition]
OCEANS >SALINITY/DENSITY >SALINITY    [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES >SEISMIC PROFILE    [Definition]
OCEANS >MARINE GEOPHYSICS >PLATE TECTONICS >SEAFLOOR SPREADING    [Definition]
OCEANS >MARINE GEOPHYSICS >PLATE TECTONICS >SUBDUCTION    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ELEVATION
GEOSCIENTIFIC INFORMATION
OCEANS


Platform
SHIPS    [Information]


Instrument
GRAVIMETERS    [Information]
THERMOSALINOGRAPHS    [Information]
MAGNETOMETERS    [Information]
GPS >Global Positioning System    [Information]
SEISMIC REFLECTION PROFILERS    [Information]
ECHO SOUNDERS    [Information]
FLUOROMETERS    [Information]


Keywords
ANTARCTIC PLATE
GEODYNAMICS
PLATE BOUNDARY
SCOTIA PLATE
TRIPLE JUNCTION


Data Center
Unidad de Tecnologia Marina, Consejo Superior de Investigaciones Cientificas, Espana    [Information]
Data Center URL: http://www.utm.csic.es/
Dataset ID: He003 Campa?a Bio Hesperides

Data Center Personnel
Name: MIGUEL ANGEL OJEDA
Phone: +34932216416
Email: maojeda at utm.csic.es
Contact Address:
Centro Mediterraneo de Investigaciones Marinas y Ambientales
CSIC
Unidad de Tecnologia Marina
Paseo Maritimo, 37-39
City: Barcelona
Postal Code: 08003
Country: SPAIN



Distribution
Distribution_Media: CD-ROM, DAT tape
Distribution_Format: ASCII, BINARY


Personnel
JUAN ACOSTA
Role: INVESTIGATOR
Phone: +34913473600
Fax: +34914135597
Email: Juan.acosta at md.ieo.es
Contact Address:
Instituto Espanol de Oceanografia
C/ Corazon de Maria no. 8
City: Madrid
Postal Code: 28002
Country: SPAIN


ANTONIO BARRAGAN SANABRIA
Role: DIF AUTHOR
Phone: +34913495731
Fax: +34913495929
Email: a.barragan at igme.es
Contact Address:
Centro Nacional de Datos Antarticos
Instituto Geologico y Minero de Espana
c/Rios Rosas 23
City: Madrid
Postal Code: 28003
Country: SPAIN



Creation and Review Dates
DIF Creation Date: 2001-06-12
Last DIF Revision Date: 2016-01-27
Future DIF Review Date: 2001-12-01



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