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Lakeshore traps, Keweenaw Co., Michigan, USAi
Regional Level Types
Lakeshore traps- not defined -
Keweenaw Co.County
MichiganState
USACountry

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Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Collecting in the Lake shore traps, Keweenaw Co. Michigan

Lakeshore traps, Keweenaw Co., Michigan, USA
Latitude & Longitude (WGS84): 47° 28' 26'' North , 87° 55' 31'' West
Latitude & Longitude (decimal): 47.47400,-87.92551
GeoHash:G#: f03qp4qs5
Köppen climate type:Dfb : Warm-summer humid continental climate


Basalts and interbedded conglomerates.
The coordinates for this locality were selected arbitrarily. The specimens were collected at various remote locations both east and west of Copper Harbor over a long period of time. The Lakeshore Traps are basalt flows that are integral within the Copper Harbor Conglomerate. The Macrostrat map outlines two of these flows in Keweenaw County. There is at least one more flow under Lake Superior that is not shown.

Regions containing this locality

North America Plate

Plate - 4,949 mineral species & varietal names listed

Keweenaw Peninsula, Michigan, USA

Peninsula - 242 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

10 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Reference: Bornhorst T. J. and Barron R. J., (2013), Field Trip Guidebook, Institute on Lake Superior Geology
'Basalt'
Reference: White, Walter S, (1972), The Base of the Upper Keweenawan, Michigan and Wisconsin, Geological Survey Bulletin 1354-f.
Calcite
Formula: CaCO3
Reference: Elmore, R. Douglas, (1983), Precambrian non-marine stromatolites in alluvial fan deposits, Copper Harbor Conglomerate, upper Michigan, Department of Geological Sciences, University of Michigan,
Celadonite
Formula: K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chamosite
Formula: (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
Reference: Larry Maltby, The Mineralogy of Michigan, Henrich-Robinson describes the chlorite in Keweenaw Co. as chamosite forming a solid solution series with clinochlore. The dark green to black chlorite has consistently proven to be chamosite.
'Conglomerate'
Reference: Elmore, R. Douglas, (1983), Precambrian non-marine stromatolites in alluvial fan deposits, Copper Harbor Conglomerate, upper Michigan, Department of Geological Sciences, University of Michigan,
'Fayalite-Forsterite Series'
Reference: Bornhorst T. J. and Barron R. J., (2013), Field Trip Guidebook, Institute on Lake Superior Geology
Fluorite
Formula: CaF2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Gypsum
Formula: CaSO4 · 2H2O
Reference: Elmore, R. Douglas, (1983), Precambrian non-marine stromatolites in alluvial fan deposits, Copper Harbor Conglomerate, upper Michigan, Department of Geological Sciences, University of Michigan,
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Heinrich, E. W. and Robinson, George W., (2004), Mineralogy of Michigan
Mesolite
Formula: Na2Ca2Si9Al6O30 · 8H2O
Reference: Heinrich, E. W. and Robinson, George W., (2004), Mineralogy of Michigan
'Mudstone'
Reference: Elmore, R. Douglas, (1983), Precambrian non-marine stromatolites in alluvial fan deposits, Copper Harbor Conglomerate, upper Michigan, Department of Geological Sciences, University of Michigan,
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: Heinrich, E. W. and Robinson, George W., (2004), Mineralogy of Michigan
'Olivine basalt'
Reference: Bornhorst T. J. and Barron R. J., (2013), Field Trip Guidebook, Institute on Lake Superior Geology
Quartz
Formula: SiO2
Reference: Larry Maltby; Heinrich/Robinson (2004) Mineralogy of Michigan, see Quartz, Keweenaw Co.
Quartz var: Agate
Reference: Larry Maltby; Heinrich/Robinson (2004) Mineralogy of Michigan, see Quartz, Keweenaw Co.
Quartz var: Chalcedony
Formula: SiO2
Reference: Larry Maltby; Heinrich/Robinson (2004) Mineralogy of Michigan, see Quartz, Keweenaw Co.
'Sandstone'
Reference: Elmore, R. Douglas, (1983), Precambrian non-marine stromatolites in alluvial fan deposits, Copper Harbor Conglomerate, upper Michigan, Department of Geological Sciences, University of Michigan,
'Siltstone'
Reference: Bornhorst T. J. and Barron R. J., (2013), Field Trip Guidebook, Institute on Lake Superior Geology
'Smectite Group'
Formula: A0.3D2-3[T4O10]Z2 · nH2O
Reference: Bornhorst T. J. and Barron R. J., (2013), Field Trip Guidebook, Institute on Lake Superior Geology
'Thomsonite'
Reference: Heinrich, E. W. and Robinson, George W., (2004), Mineralogy of Michigan

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Agate4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Gypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Celadonite9.EC.15K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chamosite9.EC.55(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Mesolite9.GA.05Na2Ca2Si9Al6O30 · 8H2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
Basalt-
Conglomerate-
Fayalite-Forsterite Series-
Mudstone-
Olivine basalt-
Sandstone-
Siltstone-
Smectite Group-A0.3D2-3[T4O10]Z2 · nH2O
Thomsonite-

List of minerals arranged by Dana 8th Edition classification

Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Celadonite71.2.2a.6K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Chamosite71.4.1.7(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Mesolite77.1.5.4Na2Ca2Si9Al6O30 · 8H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
'Basalt'-
'Conglomerate'-
'Fayalite-Forsterite Series'-
'Mudstone'-
'Olivine basalt'-
Quartz
var: Agate
-SiO2
var: Chalcedony-SiO2
'Sandstone'-
'Siltstone'-
'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O
'Thomsonite'-

List of minerals for each chemical element

HHydrogen
H AnalcimeNa(AlSi2O6) · H2O
H CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
H Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
H GypsumCaSO4 · 2H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H MesoliteNa2Ca2Si9Al6O30 · 8H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
CCarbon
C CalciteCaCO3
OOxygen
O AnalcimeNa(AlSi2O6) · H2O
O CalciteCaCO3
O CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
O Quartz (var: Chalcedony)SiO2
O Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
O GypsumCaSO4 · 2H2O
O LaumontiteCaAl2Si4O12 · 4H2O
O MesoliteNa2Ca2Si9Al6O30 · 8H2O
O NatroliteNa2Al2Si3O10 · 2H2O
O QuartzSiO2
O Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
FFluorine
F FluoriteCaF2
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
Na MesoliteNa2Ca2Si9Al6O30 · 8H2O
Na NatroliteNa2Al2Si3O10 · 2H2O
MgMagnesium
Mg CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Mg Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
AlAluminium
Al AnalcimeNa(AlSi2O6) · H2O
Al Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
Al LaumontiteCaAl2Si4O12 · 4H2O
Al MesoliteNa2Ca2Si9Al6O30 · 8H2O
Al NatroliteNa2Al2Si3O10 · 2H2O
SiSilicon
Si AnalcimeNa(AlSi2O6) · H2O
Si CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Si Quartz (var: Chalcedony)SiO2
Si Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
Si LaumontiteCaAl2Si4O12 · 4H2O
Si MesoliteNa2Ca2Si9Al6O30 · 8H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si QuartzSiO2
SSulfur
S GypsumCaSO4 · 2H2O
KPotassium
K CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca FluoriteCaF2
Ca GypsumCaSO4 · 2H2O
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca MesoliteNa2Ca2Si9Al6O30 · 8H2O
FeIron
Fe CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Fe Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Mesoproterozoic
1000 - 1600 Ma



ID: 2783709
Copper Harbor Conglomerate; Volcanic member

Age: Mesoproterozoic (1000 - 1600 Ma)

Stratigraphic Name: Copper Harbor Conglomerate

Description: Basaltic to andesitic volcanic flows interbedded within the conglomerate and sandstone

Comments: Local usage calls these interbedded volcanic (andesitic) flows "Lake shore traps". A U-Pb zircon age for this unit in Michigan yields a date of 1087.2 +/- 1.6 Ma (Davis, D.W., and Paces, J.B., 1990, Time resolution of geologic events on the Keweenaw Peninsula and implications for development of the Midcontinent rift system: Earth and Planetary Science Letters, v. 97, p. 54-64.) Original map source: Cannon, W.F., Kress, T.H., Sutphin, D.M., Morey, G.B., Meints, Joyce, and Barber-Delach, Robert, 1997, Digital Geologic Map and mineral deposits of the Lake Superior Region, Minnesota, Wisconsin, Michigan: USGS Open-File Report 97-455 (version 3, Nov. 19

Lithology: Major:{basaltic andesite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Stenian
1000 - 1200 Ma



ID: 3184728
Mesoproterozoic volcanic rocks

Age: Stenian (1000 - 1200 Ma)

Comments: Mid-Continent Rift

Lithology: Bimodal volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Maltby, Larry, Heinrich/Robinson (2004), Mineralogy of Michigan.

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