(Table 2) Chemical composition of quenched glasses from the Mohns and Knipovich Ridges

• Main Authors: Sushchevskaya, Nadezhda M, Cherkashov, Georgy A, Tsekhonya, T I, Bogdanov, Yury A, Belyatsky, Boris V, Kononkova, N N
• Format: Dataset
• Language: English
• Published: PANGAEA 2000
• Subjects: Akademik Mstislav Keldysh; Aluminium oxide; AMK36; AMK36-3571; AMK36-3572; AMK38; AMK38-3783; AMK38-3786; AMK38-3792; Archive of Ocean Data; ARCOD; Calcium oxide; Calculated; CAMECA electron microprobe; Dredge; DRG; Elevation of event; Elevation of event 2; Event label; Greenland Sea; Iron oxide; FeO; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; Magnesium oxide; Manganese oxide; MIR-1; MIR-1 deep-sea manned submersible; MIR-2; MIR-2 deep-sea manned submersible; Norwegian Sea; Phosphorus oxide; PL15; PL15-54; PL15-55; PL15-57; PL15-60; PL15-65; PL15-67; PL15-68; Potassium oxide; Professor Logachev; Sample code/label; Secondary ion mass spectrometry (SIMS); Silicon dioxide; Sodium oxide; Sum; Titanium dioxide; Gakkel Ridge; Greenland; Jan Mayen; Knipovich Ridge; Mid-Atlantic Ridge; Iceland; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.744747; https://doi.org/10.1594/PANGAEA.744747

The aim of this project was a petrogeochemical study of igneous rocks in the areas of the Mohns and Knipovich Ridges, both being the northern extensions of the Mid-Atlantic Ridge (MAR), using data available for quenching glass samples collected during Cruises 36 and 38 of R/V Akademic Mstislav Keldysh and during Cruise 15 of R/V Professor Logachev. Results of igneous rock studying from the Mohns and Knipovich Ridges at the background of evolution of the total North Atlantic Province, which had been identified earlier from tectonic and geophysical data, showed that igneous rocks of the Knipovich Ridge can be ranked as shallow tholeiites, primary melts of which were relatively rich in Na and Si and poor in Fe. This type of magma is characteristic of colder regions of the oceanic lithosphere. Its occurrence in the Knipovich Ridge and its potential propagation up to the Gakkel Ridge suggest that igneous rocks of this region originated under conditions of passive spreading in contrast to the MAR region in vicinity of Iceland and Azores, where substantial contribution of hotter material of a rising plume contributed to formation of the oceanic crust. The North Atlantic Ocean is the youngest province in terms of ocean-floor opening. Geologically and geophysically it is one of well studied regions of the World Ocean. Nevertheless some basic key items of its origin still remain to be clarified. In 1975 Scatler et al. proved specifics of this region manifested in growth of the gravity field, and also in relative height of the ocean floor in the region of 33-70°N, which was associated by them with rise of the hotter mantle, as compared with common regions of the Mid-Atlantic Ridge. Later this view was confirmed by character of magmatism, which differed in depth of generation and by melting degree of the resulting primary magma. Uniqueness of the North Atlantic region was also proved by the fact that this region was marked by extensive geochemical anomalies associated with Azores, Iceland, and Jan Mayen. All of these data ...