Kelsey Lamothe- University of Melbourne
Kelsey Lamothe
- University of Melbourne
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16
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Introduction
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Publications
Publications (16)
Phosphorus is a limiting nutrient that is thought to control oceanic oxygen levels to a large extent1–3. A possible increase in marine phosphorus concentrations during the Ediacaran Period (about 635–539 million years ago) has been proposed as a driver for increasing oxygen levels4–6. However, little is known about the nature and evolution of phosp...
Otavi Group is a 1.5−3.5-km-thick epicontinental marine carbonate succession of
Neoproterozoic age, exposed in an 800-km-long Ediacaran−Cambrian fold belt that rims
the SW cape of Congo craton in northern Namibia. Along its southern margin, a contiguous
distally tapered foreslope carbonate wedge of the same age is called Swakop Group.
Swakop Group...
The Labrador Trough in northern Québec and Labrador is a 900 km-long Rhyacian–Orosirian orogenic belt containing mixed sedimentary-volcanic successions. Despite having been studied intensively since the 1940s, relatively few chemostratigraphic studies have been conducted. To improve our understanding of the Labrador Trough in the context of Earth h...
Significance
Carbonate sediments of Neoproterozoic age exhibit large secular excursions of carbon isotope composition outside the range of modern seawater dissolved inorganic carbon (DIC), but their origins are controversial. We show that in a Neoproterozoic carbonate platform in Namibia, such excursions disappear on the flanks of the platform, whe...
During earthquake propagation, geologic faults lose their strength, then strengthen as slip slows and stops. Many slip-weakening mechanisms are active in the upper-mid crust, but healing is not always well-explained. Here we show that the distinct structure and rate-dependent properties of amorphous nanopowder (not silica gel) formed by grinding of...
Cryogenian synglacial deposits are regionally thin but locally thick, considering glacial duration, but the reasons for local thickening are poorly known. We studied three local thickenings of the Sturtian Chuos Formation in northern Namibia by measuring closely spaced columnar sections, not only of the synglacial deposits but also of the bounding...
