Apatite fission track analytical data for samples from ODP Leg 152

• Main Authors: Clift, Peter D, Carter, Andrew, Hurford, Anthony J
• Format: Dataset
• Language: English
• Published: PANGAEA 1996
• Subjects: 152-914B; 152-915A; 152-918D; Age; dated; dated material; dated standard deviation; maximum/old; standard deviation; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Fission-track length; mean; Fission-tracks; density; counted in stan; induced; spontaneous; Greenland Sea; Joides Resolution; Leg152; Number of observations; Number of tests; Ocean Drilling Program; ODP; Sample code/label; Greenland; East Greenland; Iceland
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.712923; https://doi.org/10.1594/PANGAEA.712923

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.