Morphology and structure of the Lomonosov Ridge, Arctic Ocean

Cochran, James R.; Edwards, Margo H.; Coakley, Bernard

doi:10.1029/2005gc001114

Cited by 60 publications

(67 citation statements)

References 92 publications

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“…Furthermore, the waters of the Southern Ocean completely surround the continent of Antarctica and are driven by the largest and strongest current system in the World Ocean, the Antarctic Circumpolar Current (ACC). Conversely, the Arctic Ocean is surrounded by Eurasian and North American land masses, with its basin perennially covered by ice and divided by a midbasin ridge (6).…”

mentioning

confidence: 99%

Pole-to-pole biogeography of surface and deep marine bacterial communities

Ghiglione

Galand

Pommier

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

274

230

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The Antarctic and Arctic regions offer a unique opportunity to test factors shaping biogeography of marine microbial communities because these regions are geographically far apart, yet share similar selection pressures. Here, we report a comprehensive comparison of bacterioplankton diversity between polar oceans, using standardized methods for pyrosequencing the V6 region of the small subunit ribosomal (SSU) rRNA gene. Bacterial communities from lower latitude oceans were included, providing a global perspective. A clear difference between Southern and Arctic Ocean surface communities was evident, with 78% of operational taxonomic units (OTUs) unique to the Southern Ocean and 70% unique to the Arctic Ocean. Although polar ocean bacterial communities were more similar to each other than to lower latitude pelagic communities, analyses of depths, seasons, and coastal vs. open waters, the Southern and Arctic Ocean bacterioplankton communities consistently clustered separately from each other. Coastal surface Southern and Arctic Ocean communities were more dissimilar from their respective open ocean communities. In contrast, deep ocean communities differed less between poles and lower latitude deep waters and displayed different diversity patterns compared with the surface. In addition, estimated diversity (Chao1) for surface and deep communities did not correlate significantly with latitude or temperature. Our results suggest differences in environmental conditions at the poles and different selection mechanisms controlling surface and deep ocean community structure and diversity. Surface bacterioplankton may be subjected to more short-term, variable conditions, whereas deep communities appear to be structured by longer water-mass residence time and connectivity through ocean circulation. bipolar | biodiversity | next-generation sequencing | microbial ecology

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mentioning

confidence: 99%

Pole-to-pole biogeography of surface and deep marine bacterial communities

Ghiglione

Galand

Pommier

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

274

230

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“…On the Siberian side of the Eurasian Basin, the oldest anomaly is tentatively interpreted as chron C24 (Glebovsky et al, 2006). These observations imply that the opening of the Eurasian Basin commenced on the European side, and might have propagated toward the Siberian side (Cochran et al, 2006) where a major continental rift developed at the shelf, the Laptev Sea Rift (e.g., Franke and Hinz, 2005).…”

Section: Geological Setting Eurasian Basin Of the Arctic Oceanmentioning

confidence: 87%

“…However, they did not present a conclusive interpretation in between the North Barents Sea continental margin and magnetic anomaly C24. Several recent magnetic anomaly interpretations and plate models favor the presence of magnetic chron C25 (Brozena et al, 2003;Cochran et al, 2006;Døssing et al, 2014) with an age of ∼56 Ma from the Late Paleocene. Brozena et al (2003) identified anomalies C25 to C15 (56-34.8 Ma) terminating shortly before the NE Yermak Plateau and Morris Jesup Rise flanks, anomalies C12-C8 (30.8-25.9 Ma) spreading apart of the plateaus and extending for another 60-90 km to the SW, and anomaly C5 (9.8 Ma) continuing into the Fram Strait.…”

Section: Geological Setting Eurasian Basin Of the Arctic Oceanmentioning

confidence: 99%

“…The conjugate continental margin of the Lomonosov Ridge consists of sets of rotated fault blocks stepping down to the basin over some tens of kilometers (Cochran et al, 2006;Langinen et al, 2009). Cochran et al (2006) concluded from an extensive study of the Lomonosov Ridge that the continentocean transition zone at the Eurasian flank is much narrower than observed at other magma-poor margins worldwide.…”

Section: Yermak Plateau and Morris Jesup Risementioning

confidence: 99%

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Initial Opening of the Eurasian Basin, Arctic Ocean

et al. 2016

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“…Bathymetry, gravity and seismic data indicate that the ridge broadens towards the Laptev Shelf (e.g., [7,24]); see Fig. 1).…”

Section: Tectonic Setting Of the Eastern Eurasian Basinmentioning

confidence: 99%

Ultraslow spreading, ridge relocation and compressional events in the East Arctic region: A link to the Eurekan orogeny?

Gaina

Nikishin

Petrov³

2015

Arktos

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New and available geophysical data from the Eastern Arctic (around the Siberian tip of the Lomonosov Ridge) indicate a change in the tectonic regime at the Eocene time. Oceanic crust identified on the new seismic reflection data in the Amundsen Basin displays an asymmetric fabric also visible in the gravity and magnetic gridded data. Tentative dating of the weak magnetic anomalies suggests asymmetric spreading or ridge relocation from ca. 49 to 33 Ma. Three seismic reflection transects through the Laptev Sea, Lomonosov Ridge and adjacent basins image several compressional features, most likely initiated in the Eocene. According to a regional plate tectonic model, the Greenland plate has pushed the Lomonosov Ridge by ca. 30 mm/year from 54 to 49 Ma and by ca. 13.5 mm/year afterwards, until Early Miocene. We suggest that intraplate stresses triggered by the Eocene to Oligocene northern movement of the Greenland plate and subsequent collision with the North American plate that created the Eurekan deformation, have propagated through the Arctic region and affected part of the East Siberian Shelf, Podvodnikov Basin, Laptev Sea and modified the spreading direction in the eastern Eurasia Basin. We estimate that these changes started at the same time as the peak compressional phase in North Greenland dated 49-47 Ma and lasted until Oligocene time when the large-scale tectonic regime changed by incorporating Greenland into the North American plate.

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Morphology and structure of the Lomonosov Ridge, Arctic Ocean

Cited by 60 publications

References 92 publications

Pole-to-pole biogeography of surface and deep marine bacterial communities

Pole-to-pole biogeography of surface and deep marine bacterial communities

Initial Opening of the Eurasian Basin, Arctic Ocean

Ultraslow spreading, ridge relocation and compressional events in the East Arctic region: A link to the Eurekan orogeny?

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