File:Pelagite (deep seafloor manganese nodule) (Pacific Ocean) 2.jpg
Original file (1,390 × 666 pixels, file size: 224 KB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionPelagite (deep seafloor manganese nodule) (Pacific Ocean) 2.jpg |
English: Pelagite (deep seafloor manganese nodule) from the Pacific Ocean seafloor. (8-9 mm thick)
Some portions of the deepest seafloors of the world have common to abundant, dark-colored, manganese-rich nodules. These are called pelagites. They were first discovered in the 1860s in the Kara Sea. They are composed of various Mn, Fe, Cu, Ni, and Co minerals. Some materials commonly identified in these nodules include todorokite ((Mn,Ca,Mg)Mn3O7·H2O), birnessite (~Na4Mn14O27·9H2O), amorphous hydrous Fe-hydroxyoxides, goethite, detrital volcanic aluminosilicates, zeolites, etc. Pelagites are surprisingly lightweight for their size, and do not have the look & feel of “normal rocks”. Manganese nodules grow extremely slowly, estimated at ~5 mm per million years. Cross-sections show irregular concentric layering. They appear to form intermittently, rather than by continuous accretion of layers. Manganese nodule formation is not well understood. Unsolved problems include: 1) explaining how they stay at the seafloor surface, even where sedimentation rates exceed nodule growth rates; and 2) larger nodules appear to grow more quickly. More than one growth mechanism may be involved in the genesis of manganese nodules around the world. The pelagite specimen shown above is broken so that it shows a cross-section through its center. Irregularly concentric banding is visible, apparently nucleated around an orangish-brown rock fragment. |
Date | |
Source | https://www.flickr.com/photos/jsjgeology/14953810507/ |
Author | James St. John |
Licensing
[edit]- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14953810507. It was reviewed on 19 March 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
19 March 2021
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 16:51, 19 March 2021 | 1,390 × 666 (224 KB) | Joq Oliver (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/jsjgeology/14953810507/ with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikipedia.org
- Usage on hy.wikipedia.org
- Usage on www.wikidata.org