File:Allouez Conglomerate (Mesoproterozoic, ~1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 2.jpg
![File:Allouez Conglomerate (Mesoproterozoic, ~1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Allouez_Conglomerate_%28Mesoproterozoic%2C_~1.094_Ga%3B_Delaware_Copper_Mine%2C_Keweenaw_Peninsula%2C_Upper_Peninsula_of_Michigan%2C_USA%29_2.jpg/800px-Allouez_Conglomerate_%28Mesoproterozoic%2C_~1.094_Ga%3B_Delaware_Copper_Mine%2C_Keweenaw_Peninsula%2C_Upper_Peninsula_of_Michigan%2C_USA%29_2.jpg?20201216171349)
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[edit]DescriptionAllouez Conglomerate (Mesoproterozoic, ~1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 2.jpg |
English: Conglomerate from the Precambrian of Michigan, USA.
This rock is from a cupriferous conglomerate bed in an otherwise lava-dominated succession called the Portage Lake Volcanic Series. The conglomerate is dominated by felsite clasts. The Portage Lake Volcanic Series is an extremely thick, Precambrian-aged, flood basalt deposit that fills up an ancient continental rift valley. The rift valley, analogous to the present-day East African Rift Valley, extends from Kansas to Minnesota to the Lake Superior area to southern Michigan. Unlike many flood basalts (e.g., Deccan Traps, Siberian Traps, Columbia River), the Portage Lake only filled up the rift valley. The unit is exposed throughout Michigan's Keweenaw Peninsula, in the vicinity of the towns of Houghton & Hancock. The Portage Lake succession thickens northward through the Keweenaw, reaching over 5.5 kilometers worth of section in places. The dominant rock type is basalt - vesicular basalts, for the most part. Most of the original vesicles (gas bubbles) have since been filled up with a wide variety of different minerals. A vesicular basalt that has had its vesicles filled up with minerals is called an amygdaloidal basalt. Keweenaw amygdaloidal basalts have long had significant economic importance because native copper (Cu) is one of the more common vesicle-filling and fracture-filling minerals. Keweenaw has (had) the highest concentration of native copper anywhere on Earth. Numerous Keweenaw-area copper mines have exploited these cupriferous amygdaloidal basalts. Almost all of the copper mines have since shut down. Basalt is the not the only lithology in the Portage Lake succession - coarse-grained siliciclastics (conglomerates, sandstones) were occasionally deposited atop the basalts between lava flow events. These beds are fairly similar to the coarse-grained siliciclastics in the overyling Copper Harbor Conglomerate. Stratigraphy: Allouez Conglomerate (formerly known as the Number 15 Conglomerate), just below the Greenstone Flow, upper Portage Lake Volcanic Series, Bergland Group, middle Keweenawan Supergroup, upper Mesoproterozoic, ~1.094 Ga Locality: waste rock pile, Delaware Copper Mine, just north of Route 41, town of Delaware, northern Keweenaw Peninsula, northeastern Keweenaw County, far-northern Upper Peninsula of Michigan, USA (47° 25.468' North latitude, 88° 05.900’ West longitude) |
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Source | https://www.flickr.com/photos/47445767@N05/50725566847/ |
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@N05/50725566847. It was reviewed on 16 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
16 December 2020
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current | 17:13, 16 December 2020 | ![]() | 3,933 × 2,723 (7.23 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50725566847/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 18:27, 11 December 2020 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 01:55, 16 December 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 18:27, 11 December 2020 |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
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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 | 20:55, 15 December 2020 |
Unique ID of original document | 233E35A0E707D4748DB7E1442B6F6D49 |