Evidence for Remobilization of Barite Affecting Radiometric Dating Using 228Ra, 228Th, and 226Ra/Ba Values: Implications for the Evolution of Sea-Floor Volcanogenic Massive Sulfides

2017 ◽  
Vol 112 (5) ◽  
Author(s):  
Robert G. Ditchburn ◽  
Cornel E.J. de Ronde
Keyword(s):  
Radiometric Dating ◽  
Massive Sulfides ◽  
Sea Floor ◽  
Volcanogenic Massive Sulfides

Late Cretaceous to early Tertiary magnetostratigraphy of a continental sequence: Red Deer Valley, Alberta, Canada

1985 ◽  
Vol 22 (4) ◽  
pp. 567-583 ◽  
Author(s):  
John F. Lerbekmo ◽  
Kenneth C. Coulter
Keyword(s):  
Late Cretaceous ◽  
Remanent Magnetization ◽  
Red Deer ◽  
Magnetic Anomalies ◽  
Radiometric Dating ◽  
Systematic Sampling ◽  
Coal Seams ◽  
Sea Floor ◽  
Early Tertiary ◽  
Early Paleocene

The Red Deer Valley exposes a conformable 350 m thick late Campanian to Early Paleocene fluvial–deltaic coal-bearing sequence named the Edmonton Group. Systematic sampling and paleomagnetic analysis of the dominant lithologies (mudstones, sandstones, and shales) were carried out over five sections correlated by coal seams to provide some 500 sites (stratigraphic levels). Primary detrital remanent magnetization directions after alternating field cleaning produce a polarity reversal pattern correlatable to sea-floor magnetic anomalies 29–33.The Campanian–Maastrichtian boundary, based upon the first appearance of Wodehouseia, and the Maastrichtian–Paleocene (Cretaceous–Tertiary) boundary, based upon an Ir anomaly associated with dinosaur and Cretaceous palynofloral extinctions, correlate closely magnetostratigraphically with the marine foraminiferal section at Gubbio, Italy. Radiometric dating of bentonites has indicated the ages of these boundaries to be approximately 71 and 64 Ma, respectively.

Volcanogenic Massive Sulfides

2016 ◽  
pp. 917-923
Author(s):  
John W. Jamieson ◽  
Mark D. Hannington ◽  
Sven Petersen ◽  
Margaret K. Tivey
Keyword(s):  
Massive Sulfides ◽  
Volcanogenic Massive Sulfides
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