Browsing Waterloo Research by Author "Kunert, Alexandra"

Now showing items 1-3 of 3

Global ocean redox changes before and during the Toarcian Oceanic Anoxic Event

Kunert, Alexandra; Kendall, Brian (Springer Nature, 2023-02-13)

Mesozoic oceanic anoxic events are recognized as widespread deposits of marine organic-rich mudrocks temporally associated with mass extinctions and large igneous province emplacement. The Toarcian Oceanic Anoxic Event is ...
Inverse correlation between the molybdenum and uranium isotope compositions of Upper Devonian black shales caused by changes in local depositional conditions rather than global ocean redox variations

Kendall, Brian; Wang, Jieying; Zheng, Wang; Romaniello, Stephen; Over, Jeffrey; Bennett, Yvonne; Xing, Liyan; Kunert, Alexandra; Boyes, Cameron; Liu, Jian (Elsevier, 2020-10-15)

Coupled Mo-U isotope data from the Upper Devonian Kettle Point Formation (Ontario, Canada) provide a cautionary tale regarding interpretation of global ocean redox conditions using data from euxinic black shales. In the ...
Molybdenum isotope constraints on the origin of vanadium hyper-enrichments in Ediacaran-Phanerozoic marine mudrocks

Kunert, Alexandra; Clarke, Johnathan; Kendall, Brian (MDPI, 2020-11-30)

Vanadium is an important redox-sensitive trace metal for paleoenvironmental reconstructions. Modern organic-rich sediments persistently contain sediment V enrichments <500 μg/g, but many ancient marine organic-rich mudrocks ...