Ontario Geological Survey
Permanent Link to this Record:
MDI31C15SE00133
| Record Name(s) | Fagan Lake North - 1989 |
|---|---|
| Related Record Type | Simple |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Jun-25 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Q Unknown |
| Revised By | A Wilson |
Primary Commodities: Marble (Structural Material)
Township or Area: South Sherbrooke, South Sherbrooke
Latitude: 44° 52' 10.34" Longitude: -76° 30' 48.58"
UTM Zone: 18 Easting: 380443 Northing: 4969572 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31C15SE
Point Location Description: General
Location Method: Data Compilation
Province: Grenville
Subprovince: Central Metasedimentary Belt
Terrane: Frontenac
Geological Age: Mesoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Marble | 1 | Calcitic | Host |
|---|---|---|---|---|
| Paragneiss | 2 | Adjacent |
Sep 18, 2015 (A Wilson) - Samples were taken from a relatively wide marble belt which trends roughly northeast through northern South Sherbrooke Township. Within the marble belt are concordant paragneiss units and semiconcordant granitic and pegmatitic bodies. The marble in the belt consists generally of fine- to medium-grained granoblastic calcitic marble. Detailed mapping in this area shows that much of the marble in this area is fine grained and grey, with alternating light and dark grey laminations. More coarsely crystalline marble is generally white, with minor amounts of graphite and phlogopite. Small units of dolomitic marble and silicate segregations also occur locally.The silicate segregations occur within the marble as pods or blocks of white plagioclase-rich rock. Thin metasedimentary units cut the marble, striking roughly in an easterly direction. In the middle of the map area is a 300 to 350 m wide granite body that has not apparently altered the adjacent marbles.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Dolomite | Economic | Ore | ||||
| 2 | Graphite | Economic | Ore | ||||
| 3 | Phlogopite | Economic | Ore |
Sep 18, 2015 (A Wilson) - Most of the samples taken from this marble belt (samples 493, 494, and 1880 to 1904) have low SiO2 contents, usually less than 2 weight percent. Most of the "calcitic marble" samples in this area are actually of dolomitic calcitic marble composition, with the MgO content ranging from 4 to 9 weight percent. Trace and metallic element contents are low in all samples in this belt. The number of metasedimentary and meta-igneous units within this grey marble make this an unfavourable area for filler material. It is possible that areas with no contaminants exist, possibly across strike in the belt.
| Rank | Classification |
|---|---|
| 1 | Metamorphic |
| Rank | Characteristic |
|---|---|
| 1 | Massive |
Mono - Geochemistry of Grenville marble in southeastern Ontario
Publication Number: MDC028 Scale: Date: 1989
Author: Grant W.T., Papertzian V.C., Kingston P.W.
Publisher Name: Ontario Geological Survey
Map - Sharbot Lake, southern Ontario
Publication Number: M2471 Scale: 1:31,680 Date: 1985
Author: Wolff J.M.
Publisher Name: Ontario Geological Survey
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