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- W2182923211 abstract "The lavas drilled during Ocean Drilling Program Leg 152 on the southeast Greenland Margin cover almost the whole compositional variation found in the North Atlantic volcanic province, ranging from picrites to dacites. Evidence for high-MgO melts, indicating a hotter than normal (plume) mantle is now found in several widespread areas, regardless of the distance to t he assumed plume center. In most areas of the North Atlantic, several parallel fractionation trends are present, indicating severa l independent magma types and magma generation events. Fe- and Ti-enriched fractionated three-phase cotectic basalts are characteristic of the North Atlantic province but are not present at the southeast Greenland Margin except for one young sill. The Tertiary basalts are richer in FeOT and poorer in Na 2O than normal mid-ocean-ridge basalts (MORB), indicating melting of hot plume material under a continental/lithospheric lid. The lavas from the southeast Greenland Margin, the Hatton Bank Margin, and the British Isles apparently formed from less hot mantle than the rest. Parts of this southern mantle were more depleted in incompatible elements than the mantle in other areas. The lavas from Hatton Bank and Site 918 have unusually high Sc contents, unparalleled in modern MORBs. All seaward-dipping reflector sequences drilled up to now (Voring Margin, Hatton Margin, southeast Greenland Margin) include crustally contaminated rocks in the oldest parts of the sequences. Thick Tertiary dacite successions formed only over the peripheral parts of the mantle plume head. The crustal contaminant at the southeast Greenland Margin is similar to that in the British Isles and Kangerlussuaq and is in strong contrast to the crustal component in the Hatton Bank lavas. This is in acc ordance with the situation of these areas in different Precambrian structural and age provinces in the North Atlantic region." @default.
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- W2182923211 date "1998-01-01" @default.
- W2182923211 modified "2023-09-27" @default.
- W2182923211 title "27. VOLCANIC ROCKS OF THE SOUTHEAST GREENLAND MARGIN IN COMPARISON WITH OTHER PARTS OF THE NORTH ATLANTIC TERTIARY IGNEOUS PROVINCE 1" @default.
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