thumbnail

The hyper-enrichment of V and Zn in black shales of the Late Devonian-Early Mississippian Bakken Formation (USA)

Chemical Geology

By:
, ORCID iD , and ORCID iD
https://doi.org/10.1016/j.chemgeo.2017.01.026

Links

Abstract

Black shales of the Late Devonian to Early Mississippian Bakken Formation are characterized by high concentrations of organic carbon and the hyper-enrichment (> 500 to 1000s of mg/kg) of V and Zn. Deposition of black shales resulted from shallow seafloor depths that promoted rapid development of euxinic conditions. Vanadium hyper-enrichments, which are unknown in modern environments, are likely the result of very high levels of dissolved H2S (~ 10 mM) in bottom waters or sediments. Because modern hyper-enrichments of Zn are documented only in Framvaren Fjord (Norway), it is likely that the biogeochemical trigger responsible for Zn hyper-enrichment in Framvaren Fjord was also present in the Bakken basin. With Framvaren Fjord as an analogue, we propose a causal link between the activity of phototrophic sulfide oxidizing bacteria, related to the development of photic-zone euxinia, and the hyper-enrichment of Zn in black shales of the Bakken Formation.

Study Area

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The hyper-enrichment of V and Zn in black shales of the Late Devonian-Early Mississippian Bakken Formation (USA)
Series title:
Chemical Geology
DOI:
10.1016/j.chemgeo.2017.01.026
Volume:
452
Year Published:
2017
Language:
English
Publisher:
Elsevier
Contributing office(s):
Eastern Energy Resources Science Center
Description:
10 p.
First page:
24
Last page:
33
Country:
Canada, United States
State:
Manitoba, Montana, North Dakota, Saskatchewan, South Dakota, Wyoming