Primary iron sulfides in CM and CR carbonaceous chondrites: Insights into nebular processes

2018 ◽  
Vol 53 (10) ◽  
pp. 2078-2106 ◽  
Author(s):  
S. A. Singerling ◽  
A. J. Brearley
Keyword(s):  
Carbonaceous Chondrites ◽  
Iron Sulfides

Stabilizing pyritic material

1989 ◽  
Vol 4 ◽  
pp. 244-248 ◽  
Author(s):  
Donald L. Wolberg
Keyword(s):  
Significant Contribution ◽  
Organic Materials ◽  
Sedimentary Rocks ◽  
Iron Sulfides ◽  
Decomposition Products ◽  
Iron Minerals ◽  
Pyrite Formation ◽  
Organic Sediments ◽  
Freshwater Environments

The minerals pyrite and marcasite (broadly termed pyritic minerals) are iron sulfides that are common if not ubiquitous in sedimentary rocks, especially in association with organic materials (Berner, 1970). In most marine sedimentary associations, pyrite and marcasite are associated with organic sediments rich in dissolved sulfate and iron minerals. Because of the rapid consumption of sulfate in freshwater environments, however, pyrite formation is more restricted in nonmarine sediments (Berner, 1983). The origin of the sulfur in nonmarine environments must lie within pre-existing rocks or volcanic detritus; a relatively small, but significant contribution may derive from plant and animal decomposition products.

METAMORPHISM OF CK CARBONACEOUS CHONDRITES: SO, WHAT’S YOUR PETROLOGIC TYPE?

2016 ◽  
Author(s):  
Tasha Dunn ◽  
◽  
Juliane Gross ◽  
Marina Ivanova
Keyword(s):  
Carbonaceous Chondrites

PREPARING FOR SAMPLE RETURN: COORDINATED ANALYSIS OF EXPERIMENTALLY SPACE WEATHERED CARBONACEOUS CHONDRITES

2018 ◽  
Author(s):  
Michelle S. Thompson ◽  
◽  
Lindsay P. Keller ◽  
Mark J. Loeffler ◽  
Richard V. Morris ◽  
...  
Keyword(s):  
Carbonaceous Chondrites ◽  
Sample Return

scholarly journals Formation of Iron Sulfides on Carbon Steel in a Specific Cement Grout Designed for Radioactive Waste Repository and Associated Corrosion Mechanisms

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3563
Author(s):  
Mathieu Robineau ◽  
Valérie Deydier ◽  
Didier Crusset ◽  
Alexandre Bellefleur ◽  
Delphine Neff ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Radioactive Waste ◽  
Corrosion Product ◽  
Product Layer ◽  
Cement Grout ◽  
Radioactive Waste Disposal ◽  
Sulfide Concentration ◽  
Iron Sulfides ◽  
Corrosion Mechanisms ◽  
A Minor

Carbon steel coupons were buried in a specific low-pH cement grout designed for radioactive waste disposal and left 6 months in anoxic conditions at 80 °C. The corrosion product layers were analyzed by µ-Raman spectroscopy, XRD, and SEM. They proved to be mainly composed of iron sulfides, with magnetite as a minor phase, mixed with components of the grout. Average corrosion rates were estimated by weight loss measurements between 3 and 6 µm yr−1. Corrosion profiles revealed local degradations with a depth up to 10 µm. It is assumed that the heterogeneity of the corrosion product layer, mainly composed of conductive compounds (FeS, Fe3S4, and Fe3O4), promotes the persistence of corrosion cells that may lead to locally aggravated degradations of the metal. New cement grouts, characterized by a slightly higher pH and a lower sulfide concentration, should then be designed for the considered application.

scholarly journals The Loongana (CL) group of carbonaceous chondrites

2021 ◽  
Author(s):  
Knut Metzler ◽  
Dominik C. Hezel ◽  
Jens Barosch ◽  
Elias Wölfer ◽  
Jonas M. Schneider ◽  
...  
Keyword(s):  
Carbonaceous Chondrites
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