A preliminary Mesozoic and Cenozoic denudation history of the North East Greenland onshore margin

Citation
C. Johnson et K. Gallagher, A preliminary Mesozoic and Cenozoic denudation history of the North East Greenland onshore margin, GLOBAL PLAN, 24(3-4), 2000, pp. 261-274
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GLOBAL AND PLANETARY CHANGE
ISSN journal
0921-8181 → ACNP
Volume
24
Issue
3-4
Year of publication
2000
Pages
261 - 274
Database
ISI
SICI code
0921-8181(200005)24:3-4<261:APMACD>2.0.ZU;2-2
Abstract
We present new apatite fission track data from SW Clavering O, East Greenla nd. The samples were collected from a vertical topographic profile covering similar to 1000 m of relief. The resulting data were modelled jointly to p roduce an internally consistent thermal history, reflecting denudationally induced shallow level crustal cooling since the Carboniferous. Three distin ct events and a fourth less well-resolved event are inferred from the resul ts of this new modelling approach. Maximum temperatures occurred in the Lat e Palaeozoic, implying a thicker Carboniferous sedimentary pile than presen tly observed. Early Jurassic cooling cannot be directly correlated to a wel l-documented period of elastic sedimentation in Hold-with-Hope, but may ind icate sedimentation at this time in the Jurassic rift axis farther to the e ast. A later mid-Cretaceous cooling episode is reflected in the pre-Palaeog ene basalt unconformity, and this denudation is likely to have shed large a mounts of siliciclastic detritus into the proto-Voring Basin. Early Palaeog ene burial occurred under a thick basaltic pile, and subsequently, denudati on occurred during the Neogene to cool the rocks by similar to 50 degrees C , which may reflect 1-2 km of denudation. (C) 2000 Elsevier Science B.V. Al l rights reserved.