Orphan Arctic Ocean metasediment clasts: Local derivation from Alpha Ridgeor pre-2.6 Ma ice rafting?

Citation
Dl. Clark et al., Orphan Arctic Ocean metasediment clasts: Local derivation from Alpha Ridgeor pre-2.6 Ma ice rafting?, GEOLOGY, 28(12), 2000, pp. 1143-1146
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGY
ISSN journal
0091-7613 → ACNP
Volume
28
Issue
12
Year of publication
2000
Pages
1143 - 1146
Database
ISI
SICI code
0091-7613(200012)28:12<1143:OAOMCL>2.0.ZU;2-9
Abstract
Phyllonite and metaquartzite clasts occur in early Pliocene or possibly Mio cene sediment at the base of the University of Wisconsin Arctic Ocean core F1-380. Single-crystal Ar-40/Ar-39 laser-probe ages derived from feldspars in sediment enclosing the clasts range from Middle and Late Proterozoic to Paleozoic. The clasts occur in sediment deposited 1-2 m.y. earlier than any previously reported central Arctic Ocean ice-rafted debris, and although a n ice-rafted origin may be possible, a local source such as adjacent Alpha Ridge bedrock should also be considered.