Constraints on the evolution of the East Greenland margin; evidence from detrital apatite in offshore sediments

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doi: 10.1130/0091-7613(1996)024<1013:COTEOT>2.3.CO;2
Author(s): Clift, Peter D.; Carter, Andrew; Hurford, Anthony J.
Author Affiliation(s): Primary:
Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States
Birkbeck and University Colleges London, United Kingdom
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 24(11), p.1013-1016. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 9658; Woods Hole Oceanogr. Inst., Contrib. No. 9277. 21 refs.; illus., incl. sketch map
Summary: We test a new approach to understanding the tectonic evolution of passive margins by using fission-track analysis on detrital apatites from sediments deposited offshore East Greenland. These apatites have not undergone postdepositional track annealing and therefore reflect provenance. The apatites preserve a component of the source rocks' thermal history that otherwise may not be retained within the present-day outcrop. Fission-track-derived denudational histories from samples at Ocean Drilling Program drill sites offshore East Greenland at lat 63°N are compared with data from the onshore Singertat Complex. Previous apatite fission-track studies and geomorphic mapping of the East Greenland coast have shown that locally up to 6 km of denudation may have occurred, implying significant tectonic or magmatic activity starting as much as 30 m.y. after breakup at 56 Ma. In contrast, apatite fission-track data presented here record <2 km of Cenozoic denudation in southeast Greenland, probably driven by magmatic underplating at the time of breakup. Large-magnitude, postrift denudation of East Greenland is restricted to the area around Kangerdlugssuaq (68°N). The timing (<40-50 Ma) and magnitude are in accord with revised plume track models suggesting that the Iceland plume crossed the margin here during the late Eocene.
Year of Publication: 1996
Research Program: ODP Ocean Drilling Program
Key Words: 03 Geochronology; 07 Marine Geology and Oceanography; 18 Geophysics, Solid-Earth; Apatite; Arctic Ocean; Arctic region; Cenozoic; Continental margin; Detrital sedimentation; Detritus; East Greenland; Fission-track dating; Geochronology; Greenland; Iceland Plume; Leg 152; Mantle plumes; Marine sediments; ODP Site 914; ODP Site 915; ODP Site 918; Ocean Drilling Program; Passive margins; Phosphates; Plate tectonics; Provenance; Sedimentation; Sediments; Singertat Complex
Coordinates: N620000 N630000 W0390000 W0410000
Record ID: 1997000036
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