File:Heavy mineral residue derived from sandstone (Pottsville Group, Middle Pennsylvanian; south of Bald Knob, Heath, Ohio, USA) (42369926322).jpg
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[edit]DescriptionHeavy mineral residue derived from sandstone (Pottsville Group, Middle Pennsylvanian; south of Bald Knob, Heath, Ohio, USA) (42369926322).jpg |
Heavy mineral residue derived from the Pennsylvanian of Ohio, USA. (photo by James Cheshire) Heavy mineral analysis of sandstones is a traditional method for determining the nature of a sediment source. "Heavy minerals" are grains that have a density greater than 3 grams per cubic centimeter (3 g/cc). Sandstone samples are disaggregated and the loose sediments are density segregated by liquid separation. In general, most heavy mineral grains are zircons, tourmaline, and rutile - these minerals are stable, despite diagenesis and overprinting effects. The actual assemblage of heavy minerals is due to a combination of factors - provenance, diagenesis, and recycling - several signals are present. In the 1970s, researchers started focusing on provenance information from lightweight minerals in sandstones, such as quartz, feldspar, and rock fragments - these were traditionally discarded. Quartz-rich lights = cratonic setting. Feldspar-rich lights = volcanic arc setting. Diagenesis can be problematic for accurate interpretation. Diagenetic fluids alter feldspars and rock fragments differently than quartz (for example, small rock fragments are often broken down during diagenesis - this can result in the formation of a graywacke - a dirty or muddy sandstone; many graywackes turn out to be sandstones with a mud pseudomatrix - they weren't "dirty sandstones" at the time of deposition). It turns out that tectonic setting and diagenetic overprinting are important factors behind a sandstone's framework sand composition. The sample shown above is a relatively heavy mineral residue obtained by panning a hand-disaggregated, Pennsylvanian-aged sandstone from Heath, Ohio. Multiple minerals are present, including pinkish-colored zircons (click on the photo to zoom in a bit). Stratigraphy: float from a sandstone horizon above the Lower Mercer Limestone, Pottsville Group, lower Middle Pennsylvanian Locality: loose piece from crest of hill along Blue Jay Road, south of Bald Knob, eastern side of the town of Heath, Licking County, Ohio, USA |
Date | |
Source | Heavy mineral residue derived from sandstone (Pottsville Group, Middle Pennsylvanian; south of Bald Knob, Heath, Ohio, USA) |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/42369926322 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
8 October 2019
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current | 12:03, 8 October 2019 | ![]() | 3,537 × 993 (2.29 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | PENTAX RICOH IMAGING |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/2.8 |
ISO speed rating | 100 |
Date and time of data generation | 11:56, 8 March 2018 |
Lens focal length | 6 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 05:07, 25 March 2018 |
Y and C positioning | Co-sited |
Exif version | 2.3 |
Date and time of digitizing | 11:56, 8 March 2018 |
Meaning of each component |
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APEX aperture | 2.970854 |
APEX exposure bias | −0.3 |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 28 mm |
Scene capture type | Standard |
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Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Date metadata was last modified | 01:07, 25 March 2018 |
Unique ID of original document | A4CE4816A708B22720E05E6AA5045009 |