File:Kimberlite (modern fluvial clast) (creek at Chatham, Licking County, Ohio, USA) 3 (49718025063).jpg
![File:Kimberlite (modern fluvial clast) (creek at Chatham, Licking County, Ohio, USA) 3 (49718025063).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Kimberlite_%28modern_fluvial_clast%29_%28creek_at_Chatham%2C_Licking_County%2C_Ohio%2C_USA%29_3_%2849718025063%29.jpg/800px-Kimberlite_%28modern_fluvial_clast%29_%28creek_at_Chatham%2C_Licking_County%2C_Ohio%2C_USA%29_3_%2849718025063%29.jpg?20200414181038)
Original file (3,396 × 1,377 pixels, file size: 3.28 MB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]DescriptionKimberlite (modern fluvial clast) (creek at Chatham, Licking County, Ohio, USA) 3 (49718025063).jpg |
(~7.4 centimeters across at its widest) Kimberlites and lamproites have tremendous economic importance because they are host rocks for gem-grade and industrial-grade diamonds. Kimberlites & lamproites are unusual igneous bodies having overall pipe-shaped geometries. Their mode of formation is only moderately understood because they have not been observed forming. Kimberlites & lamproites are known from scattered localities throughout the world - only some are significantly diamondiferous. Classic localities for diamonds are India and Brazil. Africa was also discovered to have many kimberlites and is world-famous for producing large numbers of diamonds. Other notable diamondiferous kimberlite-lamproite occurrences include Russia, China, northwestern Australia, and northwestern Canada. Kimberlites are named for the town of Kimberley, South Africa. Several kimberlite pipes occur in the Kimberley area. Kimberlites have a gently tapering-downward, pipe-shaped cross-section. Lamproites have a cross-section more closely resembling that of a martini glass. Seen here is Ohio's only known kimberlite sample. It's not from Ohio's bedrock, however - it's a modern fluvial clast, derived from a Pleistocene glacial till. The original kimberlite body was somewhere in Canada. Pleistocene glaciers eroded much of Canada's bedrock and delivered the debris to the northern parts of America, including about two-thirds of Ohio. Because this sample was not collected in-situ, additional specimens are unlikely to be found at the same site. Kimberlite is a rare rock in general. Mantle xenoliths composed of peridotite (= an olivine-rich, ultramafic, intrusive igneous rock) are scattered throughout this specimen (click on the photo once or twice to zoom in; a small peridotite xenolith is present at left). No diamonds are visible at the surface. If anyone is preparing to counter my above statement that this is Ohio's only known kimberlite with a citation to Baranoski et al. (2007), there's a tale there. Long story short - it was a practical joke gone horribly wrong. Long story long - The Murray # 2-1875 was a petroleum well drilled in 1994 into the Dillon Falls Astrobleme northwest of Zanesville, Ohio. There were two stages of drilling: 1) into the structure, which dates to the Early or Middle Ordovician; and 2) almost to basement rocks. Several wells have been drilled into the sandstones that fill the inferred impact crater - some have produced natural gas. During the second stage of drilling, while penetrating Cambrian dolostones (= Copper Ridge Dolomite to Rome Dolomite succession), a geologist, as a joke, salted a well cuttings sample bag with dark-colored, crystalline-textured igneous rock chips. The intent was to mess with a couple of the other geologists at the well site. The mudlogger washed the sample and presented it to the geologists, who were shocked. Different interpretations were quickly formulated - a sill? a kimberlite? This resulted in much commotion and laughter. The sample bag was tossed into a pile of other bags. All the sample bags were eventually sent to the Ohio Geological Survey. The geologists forgot all about it - just a small practical joke. Until 2007 - it was published! Baranoski et al. (2007) described the occurrence of an odd igneous body in this well - possibly a kimberlite. They did note the complete lack of evidence for the inferred igneous body on the wire-line log. Oops. One of the original geologists at the well site contacted the Survey upon learning of the publication. They were informed that it was a practical joke - all in fun. It was never intended to mislead anyone, let along the Ohio Geological Survey. Despite being told about the situation, the publication has not been retracted or corrected (as far as I know). Everyone gets fooled sometimes. I have. But boo-boos need to be corrected. This is a major boo-boo. Locality: loose clast from a modern gravel bar (derived from Upper Pleistocene glacial till) along a south-flowing tributary of Clear Fork, just north of Chatham Road bridge, western side of the town of Chatham, northwestern Newton Township, northern Licking County, central Ohio, USA Reference cited: Baranoski et al. (2007) - Deep gas well encounters ultramafic kimberlite-like material in the Sauk Sequence of southeastern Ohio, USA. Geosphere 3: 177-183. |
Date | |
Source | Kimberlite (modern fluvial clast) (creek at Chatham, Licking County, Ohio, USA) 3 |
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@N05/49718025063. It was reviewed on 14 April 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
14 April 2020
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 18:10, 14 April 2020 | ![]() | 3,396 × 1,377 (3.28 MB) | Poldavia (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 | Canon |
---|---|
Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/9 |
ISO speed rating | 80 |
Date and time of data generation | 21:16, 29 March 2020 |
Lens focal length | 8.295 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
|
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 23:50, 29 March 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:16, 29 March 2020 |
Meaning of each component |
|
Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 19:50, 29 March 2020 |
Unique ID of original document | 7069573E240B8514697BAFF6E5F02C4A |