Therein, the subsidence of the Greenland–Scotland Ridge (GSR) from subaerial conditions towards a submarine rise constitutes an active ocean gateway control of North Atlantic-Arctic water ...

The active mid-ocean ridge of the Arctic Ocean, named Gakkel ridge, is the slowest spreading ridge of the global system of mid-oceanic ridges with full spreading rates declining from about 12.5 to ...

The smallest of the Arctic Ocean subbasins, called the Nansen Basin, lies between the Nansen-Gakkel Ridge and the Eurasian continental margin and has a floor depth of 13,800 feet. The Amerasia Basin is divided into two unequal basins by the Alpha Cordillera (Alpha Ridge), a broad, rugged submarine mountain chain that extends to within 4,600 ...

New investigations of the Southwest Indian and Arctic ridges reveal an ultraslow-spreading class of ocean ridge that is …

The following are examples of mid-ocean ridges found on the floor of the Arctic Ocean (see Figure 2). Gakkel Ridge Mohns Ridge seamounts: Seamounts (see Figure 1) are submarine mountains at least 1,000 m (3,300 ft) high formed from individual volcanoes on the ocean floor.

THE Mid-Oceanic Ridge, a broad fractured arch more than 40,000 miles long, is the largest tectonic feature on the surface of the Earth. Associated with the centre of the ridge over much of its length is an axial fracture or rift which is the locus of shallow earthquakes. An extension of this world encircling ridge into the Greenland Sea and Arctic Ocean was …

The Arctic Mid-Oceanic Ridge THE Mid-Oceanic Ridge, a broad fractured arch more than 40,000 miles long, is the largest tectonic feature on the surface of the Earth. ... Ocean Congress, 1. 26 (1959).

the Western Gakkel Ridge region in the Arctic Ocean through MORB geochemistry and tectonic plate reconstruc-tion. We find that seafloor lavas from the Western Gakkel Ridge region mirror geochemical signatures of an Early Cretaceous, paleo-subduction zone, and conclude that the upper mantle can preserve a long-lived, stationary

1 Introduction. The Arctic Ocean is characterized by two oceanic basins, the Eurasia and the Amerasia Basin (Figure 1a), which are separated by the Lomonosov Ridge, a remant of continental crust (Gaina et al., 2014).Spreading is currently only active in the Eurasian Basin at the ultraslow spreading (8–13 mm/yr) Gakkel Ridge (Dick et al., 2003). ...

In this study, we use geochemical and molecular microbiological methods to investigate the microbial diversity in black smoker chimneys from the newly discovered Loki's Castle hydrothermal vent field on the Arctic Mid-Ocean Ridge (AMOR) with vent fluid temperatures of 310–320 °C and pH of 5.5.

Here we show that some refractory abyssal peridotites from the ultraslow-spreading Gakkel ridge (Arctic Ocean) have very depleted 187 Os/ 188 Os ratios with model ages up to 2 billion years, implying the long-term preservation of refractory domains in the asthenospheric mantle rather than their erasure by mantle convection. The refractory ...

Our sampling site, Station DM, is located at the southern Northwind Ridge, a steep ledge extending from the shallow Chukchi Shelf into the Arctic deep basin as a part of the Chukchi Borderland (Fig. 1).The surface hydrology of the region is influenced by the dynamic Beaufort Gyre (BG) circulation, the PWI entering the Arctic Ocean through the …

The ridge's bathymetry has long been discussed among oceanographers, given its impact on the circulation and water mass properties of the Arctic Ocean [e.g., Aagaard, 1981]. In the Amerasian Basin, the deep bottom waters close to the Lomonosov Ridge have been found to be slightly colder and less saline than the corresponding …

Sediments atop the ridge record the palaeoenvironmental evolution of the Cenozoic Arctic Ocean. Colours are water depth; dark blue is ∼ 4,000 m and the water depth over the ridge (light blue ...

IBCAO (International Bathymetric Chart of the Arctic Ocean) topographic map showing the sampling sites at Svyatogor Ridge, Arctic Ocean. PusC7 and BlaC3 are located 1 m away from each other and ∼25 m to the East of GC3. GC2 is located at ∼16 km from GC3, PusC7, and BlaC3 area (also summarized in Table 1).

Oceanic ridge, any of several submarine mountain chains rising from the ocean floor. Individually, the ridges are the largest features in ocean basins. Collectively, they form the worldwide oceanic ridge system—at about 80,000 km (50,000 miles) long, Earth's largest surface feature after continents and ocean basins.

The 1,800-km-long Gakkel ridge is the slowest-spreading mid-ocean ridge in the world. It forms the North America/Eurasia plate boundary in the Arctic Ocean ().To the west it passes via the Lena ...

A polar projection map showing the Arctic Mid-Ocean Ridge north of Iceland and the location of the Loki's Castle vent field (red dot). The map also shows the locations of the vent fields within ...

March 29, 2019. • 7 min read. The Arctic Ocean is Earth's northernmost body of water. It encircles the Arctic, and flows beneath it. Most of the Arctic Ocean is covered by ice …

oceanic ridge, any of several continuous submarine mountain chains rising from the ocean floor. Individually, oceanic ridges are the largest features in ocean basins.

The Gakkel Ridge, which spans the ice-covered Arctic Ocean, is both the slowest-spreading mid-ocean ridge (0.7–1.4 cm/yr 3,4,5) and the least accessible because of year-round ice-cover.

deepest portions of the global mid-ocea n ridge volcanic system. The Gakkel ridge, stretching 1,800 km across the eastern Arctic. Basin, is the ultraslow-spreading end-member of the global mid ...

Here we show that some refractory abyssal peridotites from the ultraslow-spreading Gakkel ridge (Arctic Ocean) have very depleted 187 Os/ 188 Os ratios with …

The Arctic Ocean is the smallest of the world oceans, yet one whose currents and water masses extend globally. ... densest water from the Greenland Sea from reaching the western Arctic Ocean. This ridge, the Lomonosov Ridge, had, unknown to Worthington, been detected by Soviet scientists in 1948. It was not until Aagaard (1980) …

Main. The Gakkel ridge, stretching ∼ 1,800 km across the eastern Arctic Basin, is the ultraslow-spreading end-member of the global mid-ocean ridge (MOR) system, and in 1999 the Global Seismic ...

The mountain ridge was discovered in 1948 by Russian scientists, who named it Lomonosov Ridge. The Arctic Ocean is divided into two basins-Eurasian Basin and Amerasia Basin-by the Lomonosov …

The Lomonosov Ridge is a band of continental crust that stretches across the Arctic Ocean and separates the Mesozoic Amerasian Basin from the Cenozoic Eurasian Basin. From about 87°N north of Greenland across the Pole to about 86°N, the Lomonosov Ridge is a single highstanding blocky ridge with minimum depths of …

Just as the East Pacific Rise is the only fast-spreading ridge, the only ultraslow-spreading ridge is the Gakkel ridge in the Arctic Ocean: an 1,800-km-long ridge without transform faults ...

The Nansen-Gakkel Ridge (Arctic Mid-Ocean Ridge), an active seafloor spreading center stretches across the basin north of western Russia. The Pole Abyssal Plain, an elongated trough of deep water, lies between the Arctic Ridge and the basin's dominant feature, the Lomonosov Ridge—a mountain chain that averages 10,000 feet high above the ...

Gakkel ridge stretches 1,800 km across the Eurasian basin of the Arctic Ocean ().To the west the plate boundary passes via the Lena trough and the Molloy fracture zone into the Knipovich ridge.

Arctic Ocean. Arctic Ocean, smallest of the world's oceans, centring approximately on the North Pole. The Arctic Ocean and its marginal seas—the Chukchi, East Siberian, Laptev, Kara, Barents, White, Greenland, and Beaufort and, according to some oceanographers, also the Bering and Norwegian —are the least-known basins and …

A giant caldera located in the eastern segment of the Gakkel Ridge could be firstly seen on the bathymetric map of the Arctic Ocean published in 1999. In 2014, seismic and multibeam echosounding ...

Magmatic fissures are typically about 1 m wide at oceanic spreading centres 25. A dyke intrusion such as those inferred at the Carlsberg Ridge and the Mid-Atlantic …

Geography. The Arctic Ocean is a circular basin, spanning 5.427 million square miles. It is almost 1.5 times the United States of America 's size, but slightly smaller than Russia. The Ocean is 18,210 …

Details of the ridge came to light in the first published version of IBCAO 16 where it was drastically remapped compared to the GEBCO Sheet 5.17 36, which had served as the authoritative ...

The Gakkel Ridge It wasn't until 2001, on the maiden voyage of the U.S. Coast Guard icebreaker Healy, that scientists first detected tantalizing clues that the Arctic seafloor may be unlike the seafloors of the more-explored Atlantic and Pacific Oceans.. The Gakkel Ridge is the deepest mid-ocean ridge, ranging from 3 to 5 kilometers (1.8 to 3 …

Sediment core HLY0503-03JPC from the top of the Northwind Ridge provides the first confirmed Plio-Pleistocene record from the western Arctic Ocean, with calcareous microfossils uniquely preserved ...

Although the Arctic Ocean is by far the smallest of Earth's oceans, having only a little more than one-sixth the area of the next largest, the Indian Ocean, its area of 5,440,000 square miles (14,090,000 square …

Abstract. The Lomonosov Ridge is a band of continental crust that stretches across the Arctic Ocean and separates the Mesozoic Amerasian Basin from the Cenozoic Eurasian Basin. From about 87°N …