|
Sample Source
Rock outcrop / float
Drillhole Name
Drillhole Number
Collaborative drilling initiative
Collected By
WILSON, T.C.
Collector's Number
TM00190B
Collected Date
03/10/2018
Tenement
Comments
Rock Group
IGNEOUS FELSIC INTRUSIVE
Lithology
GRANITE
Lithology Modifier
Map Symbol
Yzpp
GIS Code
Y-zp-p
Strat Unit Name
Paxton Granite
Strat Modifier
Strat Description
Monzogranite, coarse-grained, K-feldspar-porphyritic; syenogranite, biotite-bearing, variably K-feldspar-porphyritic; very minor quartz monzonite, medium-grained, dykes or sills. U-Pb age ~1715Ma.
Geological Province
GAWLER CRATON
|
|
Datum
GDA2020
Coordinate Source
GPS Standalone Navigational
MGA Easting
454966.91
MGA Northing
6603004.07
MGA Zone
53
Long Degrees
134
Long Minutes
31
Long Seconds
47.014
S Lat Degrees
30
S Lat Minutes
42
S Lat Seconds
17.75
Long Degrees Decimal
134.529726
Lat Degrees Decimal
-30.7049305
Horizontal Accuracy
10
Map 250K
TARCOOLA
Map 100K
Tarcoola
Map 50K
4
SA Geodata - Database Reference
Site No
2122953
|
|
Analysis Type
Analysis Number
Analyst
Analysis Date
Preservation
Yield
Barren
Slide in Storage
Analysis Comments
Bio.Youngest.Age
Bio.Oldest
Paleo Environment
Paleo Vegetation
Min Biostrat Zone 1
Max Biostrat Zone 2
|
Analysis Number
2227808
Petrology Number
2695969
Historical Petrology Number
Analyst
BOCKMANN, M.J.
Petrology Analysis Date
27/05/2019
Thin Section in Storage
Y
Petrology Specimen Type
Polished Thin Section
Lithology
Metagranite
Summary Decription
Detailed Decription
This rock appears heavily altered, with only a few islands of quartz (often disaggregated) in a network of veins interpreted to be remnant from the unaltered protolith (Image 429799 e-f).
Four distinct sets of veins have been identified.
An early phase of fine calcite veins (<50 μm wide) are seen cutting primary quartz at high angles to the main orientation of veins.
These veins are then truncated by the main stage of alteration by sericite. Dispersed among the sericitic alteration are domains of fine-grained quartz with indistinguishable extinction angles. These domains are interpreted to represent a single grain from the protolith, which has then been disaggregated during alteration. The minor pyrite and galena mineralisation in this sample is most commonly associated with this phase of alteration.
Overprinting this phase is a set of subparallel-trending curvilinear quartz veins (Image 429799 c-d). These veins are up to 2 mm wide and contain quartz grains between 10–300 μm, with the finer grains commonly located at the outer edges of the vein.
Finally, a set of fine (<20 μm) unmineralised calcite veins are seen cross cutting quartz veins at high angles, in a similar orientation to the first set of veins described.
Mineral Abundances by Volume
Abundant > 70%
Major 30-70%
Quartz, Sericite
Minor 5-29%
Trace 1-4%
Calcite
Rare <1%
Galena, Monazite, Pyrite, Zircon
Unknown abundance
Rock Sample Petrology information pending.
Interpretation No
84
Interpretor
BOCKMANN, M.J.
Interpretation Date
1/05/2020
Dating Method
U-Pb
Mineral
Monazite
Age
1535 ±17 Ma
Geological Attribution
Hydrothermal crystallisation
Age Type
Lower Intercept
| Report Book | 2019/00015 | Geochronology Ref. | Bockmann, M.J.;Wilson, T.C.;Pawley, M.J.;Payne, J.L.;Dutch, R.A.
LA–ICP–MS geochronology from the Tarcoola Goldfield region 2018–2019
Government of South Australia. Department for Energy and Mining. Report Book
2020 | SAMREF |