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Dominion Gulf Company claims, Lackner Township, Sudbury District, Ontario, Canada

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Latitude & Longitude (WGS84): 47° 46' 49'' North , 83° 4' 45'' West
Latitude & Longitude (decimal): 47.78028,-83.07917
GeoHash:G#: f0kzv6ps7
Locality type:Group of Claims
Köppen climate type:Dfb : Warm-summer humid continental climate


The mineralization is hosted in a very fine-grained black syenite with approximately 40% feldspar with hornblende, augite as the main mafic minerals. Some feldspathoid is reported and abundant magnetite is disseminated in the rock. The deposit is associated with the Lackner Lake alkalic complex. The complex consists of peripheral and core nepheline syenites separated by a partial ring of alkalic mafic rocks (ijolite and malingite). Dikes of magnetite and apatite cut both the mafic and syenitic phases of the complex. Lamprophyre dikes also reportedly cut the complex. The Lackner Lake complex is enclosed within the gneissic rocks of the Kapuskasing Structure.
The nepheline syenite is coarse-grained with zoned subhedral apatite, partially surrounded by orthoclase latsh, both of which are replaced in part by nepheline. Mafic minerals are interstitital and consist of clinopyroxene, biotite and magnetite. Closer to the mineralized zones, the rocks are finer grained, richer in sodic pyroxenes and have a granoblastic texture. The composition of these rocks is mafic nepheline syettie or malingite.
The apatite mineralization is hosted in a very fined grained black syenite with approximately 40% feldspar with hornblende, augite and biotite as the main mafic minerals. Some feldspathoid is reported and abundant magnetite is disseminated in the rock. The nepheline syenite is coarse grained with zoned subhedral apatite, partially surrounded by orthoclase laths both of which are replaced in part by nepheline. Mafic minerals are interstitial and consist of clinopyroxene, biotite and magnetite. Detailed petrographic work has been published by Parsons (1961), Hodder (1958) and Sage (1983).


Mineral List


16 valid minerals. 1 (TL) - type locality of valid minerals.

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

Stenian
1000 - 1200 Ma



ID: 3185173
Mesoproterozoic intrusive rocks

Age: Stenian (1000 - 1200 Ma)

Lithology: Intrusive igneous 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]

Mesoproterozoic
1000 - 1600 Ma



ID: 615136
Alkalic Intrusive Suite and Carbonatite (circa 1.1 to 1.2 Ga)

Age: Mesoproterozoic (1000 - 1600 Ma)

Comments: Southern and Superior Province

Lithology: Alkalic syenite, ijolite, nepheline syenite, fenite, associated mafic and ultramafic rocks, and minor carbonatite

Reference: Ontario Geological Survey. 1:250 000 scale bedrock geology of Ontario. ISBN 978-1-4435-5705-4. Miscellaneous Release–Data 126 - Revision 1. [1]

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



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References

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MDI Number: MDI41O14SE00012

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