File:Magnetite-rich banded iron-formation (BIF) (Michipicoten Iron-Formation, Neoarchean, 2696-2749 Ma; outcrop above Route 17 roadcut east of Bridget Lake, south of Wawa, Ontario, Canada) 30 (48070028687).jpg
![File:Magnetite-rich banded iron-formation (BIF) (Michipicoten Iron-Formation, Neoarchean, 2696-2749 Ma; outcrop above Route 17 roadcut east of Bridget Lake, south of Wawa, Ontario, Canada) 30 (48070028687).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/12/Magnetite-rich_banded_iron-formation_%28BIF%29_%28Michipicoten_Iron-Formation%2C_Neoarchean%2C_2696-2749_Ma%3B_outcrop_above_Route_17_roadcut_east_of_Bridget_Lake%2C_south_of_Wawa%2C_Ontario%2C_Canada%29_30_%2848070028687%29.jpg/800px-thumbnail.jpg?20191010005600)
Original file (4,288 × 2,848 pixels, file size: 8.66 MB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]DescriptionMagnetite-rich banded iron-formation (BIF) (Michipicoten Iron-Formation, Neoarchean, 2696-2749 Ma; outcrop above Route 17 roadcut east of Bridget Lake, south of Wawa, Ontario, Canada) 30 (48070028687).jpg |
Banded iron-formation in the Precambrian of Ontario, Canada. This is an exposure of glacially eroded, Archean-aged, folded, magnetite-rich banded iron formation (BIF). An adjacent roadcut shows these BIFs perched atop basement rocks. Occasional patches of shiny glacial polish are present. I'm not absolutely sure about the formal stratigraphic name of this unit at this site, but it appears to be the Michipicoten Iron-Formation (Neoarchean, 2.696 to 2.749 billion years old). The exposure is anthropogenic - the original vegetation and soil was stripped away after visible gold was discovered in a shear zone/fault zone nearby. The inactive Ranson Gold Mine occurs near here, which exploited the same gold occurrence that was found in the stripped area. The basement rocks below the BIFs are part of the Bridget Lake Stock, which consists of “quartz feldspar porphyry”. The Bridget Lake Stock is supposedly the source of the gold mineralization. Locality: Antoine Lake West Outcrop - glacially eroded exposure on the southern side of Route 17, just west of Antoine Lake, southeast of Bridget Lake, south-southwest of the town of Wawa, Michipicoten Greenstone Belt, Ontario, southeastern Canada (47° 53’ 44.43” North latitude, 84° 50’ 46.62” West longitude) |
Date | |
Source | Magnetite-rich banded iron-formation (BIF) (Michipicoten Iron-Formation, Neoarchean, 2696-2749 Ma; outcrop above Route 17 roadcut east of Bridget Lake, south of Wawa, Ontario, Canada) 30 |
Author | James St. John |
Licensing
[edit]![w:en:Creative Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/CC_some_rights_reserved.svg/90px-CC_some_rights_reserved.svg.png)
![attribution](https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Cc-by_new_white.svg/24px-Cc-by_new_white.svg.png)
- 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@N05/48070028687 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 October 2019
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 00:56, 10 October 2019 | ![]() | 4,288 × 2,848 (8.66 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
---|---|
Camera model | NIKON D90 |
Exposure time | 1/200 sec (0.005) |
F-number | f/7.1 |
ISO speed rating | 200 |
Date and time of data generation | 15:28, 14 July 2012 |
Lens focal length | 18 mm |
Width | 4,288 px |
Height | 2,848 px |
Bits per component |
|
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 20:29, 8 June 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 15:28, 14 July 2012 |
Meaning of each component |
|
Image compression mode | 4 |
APEX shutter speed | 7.643856 |
APEX aperture | 5.655638 |
APEX exposure bias | 0 |
Maximum land aperture | 3.6 APEX (f/3.48) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 27 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
GPS tag version | 2.2.0.0 |
Serial number of camera | 3562538 |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 14:29, 8 June 2019 |
Unique ID of original document | 28CFA9499E8DF67CB20738513589CAAC |