Afanasy Nikitin Seamount within the intraplate deformation zone, Indian Ocean

Sborshchikov, I. M.; Murdmaa, I. O.; Matveenkov, Vladimir; Kashintsev, Georgy L; Golmshtock, A.I.; Al’mukhamedov, A. I.

doi:10.1016/0025-3227(95)01995-g

Cited by 13 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Analyses of gravity and bathymetry data of the ANS (Karner and Weissel 1990;Paul et al 1990) determined a low (2-5 km) elastic plate thickness (T e ) below the ANS and was interpreted as indicating that the seamount was emplaced close to the spreading center. Subsequently, Sborshchikov et al (1995) studied the petrochemical data of the ANS and found that the main plateau of the seamount, comprised of basalts and picrite-basalts, formed on young oceanic crust during the late Cretaceous. Later more differentiated alkaline trachybasaltic to trachytic series of lava flows formed the coneshaped volcanic edifices (seamount highs in figure 2) over the main plateau.…”

Section: Introductionmentioning

confidence: 99%

Growth of the Afanasy Nikitin seamount and its relationship with the 85°E Ridge, northeastern Indian Ocean

et al. 2014

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Growth of the Afanasy Nikitin seamount and its relationship with the 85°E Ridge, northeastern Indian Ocean

et al. 2014

View full text Add to dashboard Cite

“…The results obtained in this work are collated with the earlier geophysical results of the 85 • E Ridge and Conrad Rise, and with the geochronology of the rocks recovered from the ANS (Sborshchikov et al 1995) in order to understand the evolution of ridge and ANS in a broader perspective. Recent understanding on the evolution of conjugate oceanic regions of Bay of Bengal and Enderby Basin (Gaina et al 2007;Krishna et al 2009) enlighten that most part of the oceanic crust in the Bay of Bengal was accreted during the Cretaceous super-long normal polarity phase.…”

Section: Structure and Tectonics Of The 85 • E Ridgementioning

confidence: 87%

Development of the negative gravity anomaly of the 85°E Ridge, northeastern Indian Ocean – A process oriented modelling approach

et al. 2011

View full text Add to dashboard Cite

The 85 • E Ridge extends from the Mahanadi Basin, off northeastern margin of India to the Afanasy Nikitin Seamount in the Central Indian Basin. The ridge is associated with two contrasting gravity anomalies: negative anomaly over the north part (up to 5 • N latitude), where the ridge structure is buried under thick Bengal Fan sediments and positive anomaly over the south part, where the structure is intermittently exposed above the seafloor. Ship-borne gravity and seismic reflection data are modelled using process oriented method and this suggest that the 85 • E Ridge was emplaced on approximately 10-15 km thick elastic plate (Te) and in an off-ridge tectonic setting. We simulated gravity anomalies for different crust-sediment structural configurations of the ridge that were existing at three geological ages, such as Late Cretaceous, Early Miocene and Present. The study shows that the gravity anomaly of the ridge in the north has changed through time from its inception to present. During the Late Cretaceous the ridge was associated with a significant positive anomaly with a compensation generated by a broad flexure of the Moho boundary. By Early Miocene the ridge was approximately covered by the postcollision sediments and led to alteration of the initial gravity anomaly to a small positive anomaly. At present, the ridge is buried by approximately 3 km thick Bengal Fan sediments on its crestal region and about 8 km thick pre-and post-collision sediments on the flanks. This geological setting had changed physical properties of the sediments and led to alter the minor positive gravity anomaly of Early Miocene to the distinct negative gravity anomaly.

show abstract

“…Conglomerates from the upper slope testify that the volcano emerged above sea level in the Paleocene, and subsided in the Eocene (Sborshchikov et al 1995). The ANS has got significance not only because of its tectonic history but also due to the presence of potentially economically important Co-enriched Fe-Mn crusts (Parthiban and Banakar 1999).…”

Section: Discussionmentioning

confidence: 99%

“…Subsequent to its emplacement the ANS has undergone tectonic disturbances due to intraplate deformation episodes in the region (Srikrishna et al 2001) as evidenced by numerous criss-cross faults of the seamount (Rudenko 1994). Geochemical data of volcanic rocks from the ANS represent a bimodal series of olivine picrite basalts and trachybasalt to trachyte (Sborshchikov et al 1995), indicating that the first phase of seamount volcanism occurred in the late Cretaceous adjacent to a spreading center, while the second phase of volcanic activity led to the formation of the seamount above sea level in the latest Cretaceous to Paleocene. The ANS gains significance because of its tectonic history and has presence of potentially economically important Co-enriched Fe-Mn crusts (Parthiban and Banakar 1999).…”

Section: Introductionmentioning

confidence: 99%

Bacterial Diversity in Deep-Sea Sediments from Afanasy Nikitin Seamount, Equatorial Indian Ocean

Khandeparker

Meena

Deobagkar

2014

Geomicrobiology Journal

View full text Add to dashboard Cite

Deep-sea sediments can reveal much about the last 200 million years of Earth history, including the history of ocean life and climate. Microbial diversity in Afanasy Nikitin seamount located at Equatorial East Indian Ocean (EEIO) was investigated. Deep sea sediment collected at 150 cm depth (»67 ky BP) exhibited a dominance of clones clustering in the phylum Firmicutes (63%), followed by g-Proteobacteria (37%). The bacterial diversity within sediment at 200 cm depth (»84 ky BP) was dominated by g-Proteobacteria (66%) followed by b-Proteobacteria (34%), whereas no Firmicutes clones were retrieved. Notably, 29% clones from 150 cm and 18% of clones from 200 cm sediment showed high identity to sequences previously reported from mining sites, while 21% of clones from 150 cm depth and 10% from 200 cm sediments showed identity to sequences previously reported from volcanic areas. Further, many of the sequences were from uncultured clones. Overall, these data may help elucidate the nature of microorganisms inhabiting these sites and unravel the molecular diversity of the deep sea from an evolutionary perspective.

show abstract

Afanasy Nikitin Seamount within the intraplate deformation zone, Indian Ocean

Cited by 13 publications

References 9 publications

Growth of the Afanasy Nikitin seamount and its relationship with the 85°E Ridge, northeastern Indian Ocean

Growth of the Afanasy Nikitin seamount and its relationship with the 85°E Ridge, northeastern Indian Ocean

Development of the negative gravity anomaly of the 85°E Ridge, northeastern Indian Ocean – A process oriented modelling approach

Bacterial Diversity in Deep-Sea Sediments from Afanasy Nikitin Seamount, Equatorial Indian Ocean

Contact Info

Product

Resources

About