Browsing University of Waterloo by Author "Kunert, Alexandra"
Now showing items 1-4 of 4
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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 ... -
Reconstruction of local and global marine paleoredox conditions for the northeast-Panthalassan (British Columbia, Canada) expression of the Toarcian Oceanic Anoxic Event using a multi-proxy approach
Kunert, Alexandra (University of Waterloo, 2020-01-23)The Toarcian Oceanic Anoxic Event (T-OAE) of the Early Jurassic is one of several Mesozoic instances of expanded ocean anoxia, coupled with feedbacks and perturbations in Earth’s systems. The drivers for these feedbacks ...