scholarly journals Gravity and Magnetic Constraints on the Crustal Structure and Evolution of the Horeki Seamount in the Izu-Bonin Arc

2006 ◽  
Vol 4 (0) ◽  
pp. 55-65 ◽  
Author(s):  
Toshiya Fujiwara ◽  
Yukari Kido ◽  
Yoshihiko Tamura ◽  
Osamu Ishizuka
Keyword(s):  
Crustal Structure ◽  
Gravity And Magnetic

scholarly journals Crustal structure of Mesozoic rifting in the northeastern Gulf of Mexico from integration of seismic and potential fields data

2019 ◽  
Vol 7 (4) ◽  
pp. T857-T867 ◽  
Author(s):  
Mei Liu ◽  
Irina Filina ◽  
Paul Mann
Keyword(s):  
Gulf Of Mexico ◽  
Crustal Structure ◽  
Late Jurassic ◽  
Phase 1 ◽  
Integrated Approach ◽  
High Density ◽  
Magnetic Data ◽  
Data Sets ◽  
Gravity And Magnetic ◽  
Northeastern Gulf Of Mexico

We have investigated the crustal structure of a 400 km wide zone of thinned continental crust in the northeastern Gulf of Mexico (GOM) using gravity and magnetic modeling along two deeply penetrated seismic transects. Using this approach, we identify two zones of prominent, southward-dipping reflectors associated with 7–10 km thick, dense, and highly magnetic material. Previous workers have interpreted the zones as either coarse clastic redbeds of Mesozoic age that are tilted within half-grabens or seaward-dipping reflectors of magmatic origin. Both seismic reflection lines reveal a 10 km thick and 67 km wide northern zone of high density near the Florida coastline beneath the Apalachicola rift (AR). The southern zone of high density occurs 70 km to the south in the deepwater central GOM along the northern flank of the marginal rift, a 48 km wide, southeast-trending structure of inferred Late Jurassic age that is filled by 3 km of low-density and low-magnetic susceptibility sediments including complexly deformed salt deposits. We propose that these two subparallel rifts and their associated magmatic belts formed in the following sequence: (1) AR formed during Triassic-early Jurassic (210–163 Ma) phase 1 of diffuse continental stretching and was partially infilled on its northern edge by southward-dipping volcanic flows; and (2) the similarly southward-dipping southern magmatic zone formed adjacent to the marginal rift during the early phase 2 of late Jurassic (161–153 Ma) rifting of the GOM continental extension; this southern area of SDR formation immediately preceded the formation of the adjacent oceanic crust that separated the rift-related evaporates into the northern and southern GOM. Our integrated approach combining 2D seismic, gravity, and magnetic data sets results in a more confident delineation of these deep crustal features than from seismic data alone.

scholarly journals Upper crustal structure of Deception Island area (Bransfield Strait, Antarctica) from gravity and magnetic modelling

2005 ◽  
Vol 17 (2) ◽  
pp. 213-224 ◽  
Author(s):  
A. MUÑOZ-MARTÍN ◽  
M. CATALÁN ◽  
J. MARTÍN-DÁVILA ◽  
A. CARBÓ
Keyword(s):  
Crustal Structure ◽  
Gravity Data ◽  
Bouguer Anomaly ◽  
Active Volcano ◽  
Magnetic Data ◽  
Deception Island ◽  
Intrusive Body ◽  
The South ◽  
Bransfield Strait ◽  
Gravity And Magnetic

Deception Island is a young, active volcano located in the south-western part of Bransfield Strait, between the Antarctic Peninsula and the South Shetland archipelago. New gravity and magnetic data, from a marine geophysical cruise (DECVOL-99), were analysed. Forty-eight survey lines were processed and mapped around Deception Island to obtain Bouguer and magnetic anomaly maps. These maps show well- defined groups of gravity and magnetic anomalies, as well as their gradients. To constrain the upper crustal structure, we have performed 2+1/2D forward modelling on three profiles perpendicular to the main anomalies of the area, and taking into account previously published seismic information. From the gravity and magnetic models, two types of crust were identified. These were interpreted as continental crust (located north of Deception Island) and more basic crust (south of Deception Island). The transition between these crustal types is evident in the Bouguer anomaly map as a high gradient area trending NE–SW. Both magnetic and gravity data show a wide minimum at the eastern part of Deception Island, which suggests a very low bulk susceptibility and low density intrusive body. With historical recorded eruptions and thermal and fumarolic fields, we interpret this anomaly as a partially melted intrusive body. Its top has been estimated to be at 1.7 km depth using Euler deconvolution techniques.

The crustal structure of the Central Mozambique continental margin — Wide-angle seismic, gravity and magnetic study in the Mozambique Channel, Eastern Africa

2013 ◽  
Vol 599 ◽  
pp. 170-196 ◽  
Author(s):  
Volker Thor Leinweber ◽  
Frauke Klingelhoefer ◽  
Sönke Neben ◽  
Christian Reichert ◽  
Daniel Aslanian ◽  
...  
Keyword(s):  
Continental Margin ◽  
Crustal Structure ◽  
Magnetic Study ◽  
Eastern Africa ◽  
Wide Angle ◽  
Mozambique Channel ◽  
Gravity And Magnetic
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