Sökning: "chron"

Hittade 2 avhandlingar innehållade ordet chron.

1. 1. The Arctic Ocean Palaeomagnetic Record : A Stratigraphic Approach

   Författare :Steffen Wiers; Ian Snowball; Bjarne Almqvist; Matt O'Regan; Conall Mac Niocaill; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic Ocean; Stratigraphy; Diagenesis; Palaeomagnetism;

   Sammanfattning : The Arctic Ocean is an essential component of the global climate system, yet understanding of its geological archives is hampered by difficulties in age modelling. In addition to the scarcity of dateable microfossils, the palaeomagnetic record of Arctic sediments is unusual. LÄS MER

3. 2. Problems of stratigraphic correlation across the Arctic Ocean

   Författare :Emma Sellén; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sedimentology; Sedimentologi;

   Sammanfattning : Published articles on Arctic Ocean sedimentation rates generally falls into two categories; one suggesting mm/ka-scale sedimentation rates in the Amerasian Basin and the other cm/ka-scale rates in the Eurasian Basin. This is due to the interpretation of the first measured paleomagnetic polarity change in sediment cores as either the Brunhes-Matuyama (781 ka) reversal or as the short time magnetic excursion, Biwa II (220 ka) within the Brunhes Chron. LÄS MER