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Contacts, collisions, sutures, belts, and margins -- new GSA Bulletin content
Date:4/9/2013

ted online 5 April 2013; http://dx.doi.org/10.1130/B30747.1.

The link between paleotopography and basin stratigraphy along the South Norwegian margin is a long-debated topic that recently has received new attention. Despite the wealth of data available both onshore and offshore, regional relationships between onshore source areas and offshore depocenters remain to be established. In this study, Tor O. Smme and colleagues use the volume of discrete Upper Jurassic-Paleocene, point-sourced depositional units to estimate corresponding landscape topography at the time of deposition. This is accomplished by comparing the observed volume to an ideal sediment prediction model. The results show that the geometry and volume of offshore sedimentary units are best explained by topography that varies from ~1.6 km in the latest Jurassic, to ~0.5 km in the Late Cretaceous, and ~1.1 km in the Paleocene. Long-term changes in sediment flux to the margin suggests that the onshore topography has experienced recurrent periods of uplift along major fault zones followed by periods of regional denudation. This approach may also be useful for analyzing source-to-sink relationships along continental margins elsewhere.


A new view of an old suture zone: Evidence for sinistral transpression in the Cheyenne belt
W.A. Sullivan and R.J. Beane, Dept. of Geology, Colby College, 5803 Mayflower Hill, Waterville, Maine 04901, USA. Posted online 5 April 2013; http://dx.doi.org/10.1130/B30679.1.

This article revisits a fossil plate tectonic boundary, the Cheyenne belt, which lies near the Wyoming-Colorado boarder. The Cheyenne belt separates an old piece of crust, the 1,650 to 1,800-million-year-old Colorado province, from a very old piece of crust, the 2,500 to 3,100-million-year old Wyoming province. These crustal plates were co
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8 9

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