Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.
-
date post
21-Dec-2015 -
Category
Documents
-
view
215 -
download
1
Transcript of Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.
![Page 1: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/1.jpg)
Belt/Purcell SupergroupOldest Rocks resting on NW Basement Rock
Glacier National Park
![Page 2: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/2.jpg)
Extent of the Belt/Purcell
Rocks
A-4
(from Burchfiel, Cowan, and Davis, 1992)
![Page 3: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/3.jpg)
Belt-AgeRocks
A-5
(from Winston, 1971)
![Page 4: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/4.jpg)
Belt Thickness
A-5
East(Montana)
West(Idaho)
15-20 km
![Page 5: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/5.jpg)
Rock Types
1. Shalesa) Redb) Green
2. Sandstones
3. Limestones
4. Diabase Intrusions(Type of mafic igneous rockbetween a basalt & gabbro)
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Belt Supergroup - Glacier National Park, Montana (Linda Kah).
![Page 6: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/6.jpg)
Belt Structures - Shales/Sandstone
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
• Laminations• Mudcracks• Ripples• Raindrop
Impressions• Salt Crystal
Impressions
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
![Page 7: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/7.jpg)
Belt Structures - Limestones
• StomatolitesQuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
![Page 8: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/8.jpg)
Modern Stromatolites
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Shallow Marine - Intertidal Zone
![Page 9: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/9.jpg)
Sediment Source:
East & West
A-4
(from Burchfiel, Cowan, and Davis, 1992)
![Page 10: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/10.jpg)
Age of the Belt
Youngest Basement Rock - 1,576±13 Myrs
Basalt on top = 750 to 830 Myrs
Bel
tS
uper
grou
p
Age:Between about
1,500 & 800 Myrs
Intrusiuons: ca. 1,200 MyrsMostly between
1,500 &1,200 Myrs ?
![Page 11: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/11.jpg)
Interpretations
• Red Shale• Green Shale• Sandstone• Limestone• Stomatolites• Laminations• Mudcracks• Ripples• Salt Crystals• Western Source• Diabase Intrusions
• Quiet: Land/shallow ocean• Quiet: Deeper ocean• Beach/river• Shallow tropical ocean• Shallow tropical ocean• Quiet water / no animals• Arid land surface• Intertidal zone/beach• Salty Water• Land to the west• Hot spot / Divergent zone
![Page 12: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/12.jpg)
Interpretations - Big Picture
1. Marine Embayment
2. Salty Lake
3. Inland Sea caused by Rifting
A-4
![Page 13: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/13.jpg)
Continental Rift
![Page 14: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/14.jpg)
ModernInland Seas
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Black Sea
Caspian Sea
![Page 15: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/15.jpg)
Did the Belt Rifted Apart?
East(Montana)
West
BeltSupergroup
Where did it go?
Fault Bounded
![Page 16: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/16.jpg)
The World about 800 Myrs
Montana(Belt)
New York
A-6
Rodinia“Motherland”
![Page 17: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/17.jpg)
A-7
![Page 18: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/18.jpg)
RodiniaRifts
(750 Myrs)
Montana
New York
Rifts to form the (pre-Pacific) PanthalassaOcean
Rifts to form the (pre-Atlantic) Iapetus Ocean
![Page 19: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/19.jpg)
Rifting of Rodinia
![Page 20: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/20.jpg)
As Rift Spread ApartSeiments Accumulate on the
Margin of North America
Windermere Supergroup(750-540 Myrs)
![Page 21: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/21.jpg)
Extent of the Windermere
Rocks
A-4
(from Burchfiel, Cowan, and Davis, 1992)
![Page 22: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/22.jpg)
Windermere-Aged(750-550 Myrs)
Rocks
A-5
(from Winston, 1971)
![Page 23: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/23.jpg)
Windermere: Toby Formation
Tillite
Late Proterozoic Ice Age
![Page 24: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/24.jpg)
Major“Ice Ages”
in Earth History
1
2
3
4
5A-8
![Page 25: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/25.jpg)
Glacial Evidence forlate Proterozoic Ice Age
A-8
![Page 26: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/26.jpg)
SnowballEarth?
![Page 27: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/27.jpg)
Post-RiftingWest Coast Became a Passive Margin
750 to 200 Myrs Ago
B-5
NorthAmerica
Ocean
Continental ShelfSediments
Direction of Plate Motion
![Page 28: Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park.](https://reader038.fdocuments.us/reader038/viewer/2022103123/56649d565503460f94a33e5a/html5/thumbnails/28.jpg)
A-6
Belt Supergroup
WindermereSupergroup
Continental ShelfDeposits