Accretion of crust in the axial zone of the Mid-Atlantic Ridge south of the Martin Vas Fracture Zone, South Atlantic

Сколотнев, С. Г.; Peyve, A. A.; Turko, N. N.; Bylinskaya, M. E.; Golovina, L. A.

doi:10.1134/s0016852109050021

Geotecton.

2009

DOI: 10.1134/s0016852109050021

|View full text |Cite

Accretion of crust in the axial zone of the Mid-Atlantic Ridge south of the Martin Vas Fracture Zone, South Atlantic

С. Г. Сколотнев

A. A. Peyve

N. N. Turko

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2012

2022

Publication Types

Select...

Article2

Relationship

Self Cite1

Independent1

Authors

Journals

Cited by 2 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All the pattern are characterized by distinct negative Ce anomalies, indi cating a high degree of secondary alteration of basalts (the most altered sample is I3201/1, the least altered sample is I3201/2). On spider diagrams, a positive anomaly of Nb and Ta relative to the adjacent La and Th is observed for most enriched tholeiites of the P MORB type, common in the axial part of the MAR, including the area of study [11]. This indicates the presence of the HIMU component in the mantle source of these basalts along with the depleted mantle source [12].…”

mentioning

confidence: 79%

First data about the geochemistry and geological structure of underwater seamounts between Ascension and Bode Verde transform fracture zones in the Brazilian Basin (South Atlantic)

et al. 2012

Self Cite

View full text Add to dashboard Cite

The origin of large linear structures in the oceanic crust is one of the pressing problems in marine geol ogy. During the 32nd cruise of RV Akademik Ioffe (2010), geological works were carried out at the Brazil Basin-Mid Atlantic Ridge (MAR) boundary between the passive parts of the Ascension and Bode Verde transform fracture zones in the zone of Middle-Late Eocene age of the oceanic crust (16-18 magnetic anomalies [1]). On the bathymetric structural scheme [2] (Fig. 1), a northwest trending linear chain of nine seamounts with a total length of ~460 km is shown. During field works, the two highest seamounts in the northern part of the chain were investigated.The study of underwater topography using the ELAC echo sounder showed that the top of the north ern seamount (the top coordinates are 10°20.01' S to 20°28.80' W) is located at a depth of 1127 m (Fig. 2); its elevation over the adjacent depression bottom is 3625 m, and that over the seamount base is about 3250 m. The mountain has a conical shape; however, on the western slope in its apical part, several ridges of 150 m in height over a wide terrace are observed (Fig. 2).It is probable that these ridges form the outer edge of the semi caldera.The top of the southern seamount is at a depth of 1501 m. Its elevation over the depression bottom is about 3370 m; above the seamount base it is 3270 m; and the top coordinates are 10°43.79' S and 19°51.14' W.The width of the depression enclosing the chain of seamounts is about 11 km, and its maximum depth is 4765 m. In the northern seamount (Fig. 1), according to the acoustic profile, recorded using the narrow beam parametric SES 2000 profilograph, the visible thickness of the sedimentary cover reaches 80 m (Fig. 3). It seems likely that the regular bedding observed indi cates the alternation of pelagic sediments and bioclas tic turbidites. This sequence on the slopes of the buried paleovolcanoes has a chaotic structure with landslide bodies and erosional channels. In the center of the depression, a diapir like penetration structure of about 2 km across is observed. It penetrates lower sed imentary layers, which ride up slightly along buried slopes of this structure. The upper layers of 20 m thick are not penetrated. However, they are bent upwards at the point of contact with this diapir like structure.The relationship between the penetration structure and sedimentary layers is likely to indicate the tectonic nature of the post sedimentation diapir like structures formed at the neotectonic stage. As was previously shown [3], neotectonic structures are widespread in intraplate volcanism areas within the Brazilian Basin.When dredging the seamount slopes fragments and boulders (2-40 cm in diameter) made of volcanic rocks, limestones and Fe-Mn crusts (1-40 mm thick) were sampled. The general description of samples and the coordinates of dredging stations are shown in Table 1.Samples of limestone were sampled on both sea mounts. Limestones are moderately lithified, white or cream colored rocks, consisting of foraminifera cham...

show abstract

mentioning

confidence: 79%

First data about the geochemistry and geological structure of underwater seamounts between Ascension and Bode Verde transform fracture zones in the Brazilian Basin (South Atlantic)

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

Structure of Spreading Segments of the Mid-Atlantic Ridge between the Arkhangelsky and Bogdanov Transform Faults, Equatorial Atlantic

et al. 2022

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Accretion of crust in the axial zone of the Mid-Atlantic Ridge south of the Martin Vas Fracture Zone, South Atlantic

Cited by 2 publications

References 32 publications

First data about the geochemistry and geological structure of underwater seamounts between Ascension and Bode Verde transform fracture zones in the Brazilian Basin (South Atlantic)

First data about the geochemistry and geological structure of underwater seamounts between Ascension and Bode Verde transform fracture zones in the Brazilian Basin (South Atlantic)

Structure of Spreading Segments of the Mid-Atlantic Ridge between the Arkhangelsky and Bogdanov Transform Faults, Equatorial Atlantic

Contact Info

Product

Resources

About