Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern...
Transcript of Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern...
![Page 1: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/1.jpg)
Brittle faulting in Brittle faulting in Brittle faulting in Brittle faulting in the southern the southern the southern the southern
contact zone of the contact zone of the Karkonosze granite Karkonosze granite gg
near Karpacznear Karpaczpp
Krzysztof Gaidzik, Jerzy ŻabaKrzysztof Gaidzik, Jerzy ŻabaDepartment of Fundamental GeologyDepartment of Fundamental GeologyDepartment of Fundamental GeologyDepartment of Fundamental Geology
Faculty of Earth SciencesFaculty of Earth SciencesUniversity of SilesiaUniversity of Silesia
![Page 2: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/2.jpg)
AimAim-- Reconstruct paleostress tensor responsible for development definite brittle faults Reconstruct paleostress tensor responsible for development definite brittle faults p p pp p ppopulations in the area of Karpaczpopulations in the area of Karpacz
M th d l dM th d l d
Collect faultCollect fault slip data;slip data;
MethodolodyMethodolody
--Collect faultCollect fault--slip data;slip data;
--Define direction and sense of movement along fault planes;Define direction and sense of movement along fault planes;
--Find out relative relations between fault populationsFind out relative relations between fault populations
Fiel
dFi
eld
Find out relative relations between fault populations.Find out relative relations between fault populations.
--Angelier and Hoeppener diagrams;Angelier and Hoeppener diagrams;
--Classify heterogenous faultClassify heterogenous fault--slip data into homogenous populations;slip data into homogenous populations;
orat
ory
orat
ory
--Apply methods: right dihedra method, inverse method;Apply methods: right dihedra method, inverse method;
--Present results on diagrams and maps.Present results on diagrams and maps.Labo
Labo
![Page 3: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/3.jpg)
Geological sketch map of the Karkonosze granite and its metamorphic cover (after Aleksandrowski & Mazur, 2002).
St d th t t f th K k it i th fStudy area - southern contact zone of the Karkonosze granite in the area of Karpacz: Sowia Valley, Malina Valley, Łomniczka Valley, Księża Mt., Kozi Ridge.
![Page 4: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/4.jpg)
The right dihedra (P/T quadrant) method - principles
Fault plane
+N – plane perpendicular to the
+slip lineation on the fault
T=
Two compressional quadrants (σ1)q ( 1)
Two tensional d t ( )quadrants (σ3)
![Page 5: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/5.jpg)
Faults from the area of Karpacz
A li di Hoeppener diagramAngelier diagram Hoeppener diagram
Datasets: 50
Lower hemisphere
Mostly: strike-slip faults (dextral), oblique faults with dominant strike-slip component
![Page 6: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/6.jpg)
Fault planes:
-dominant direction (strike) – NE-SW;
-mostly steep and very steep dip angle (strikesteep dip angle (strike-slip faults).
Slip lineations:
-dominant dip direction – SW;
-mostly low and very low dip angle (strike-slip faults)slip faults).
![Page 7: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/7.jpg)
Fault planes with slip lineation, steps - examples
Karkonosze granite –Kozi Ridge
Metamorphic cover –Sowia Valley
![Page 8: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/8.jpg)
Karkonosze granite –Sowia Valley
Metamorphic cover –Sowia Valley
![Page 9: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/9.jpg)
Karkonosze granite – Sowia Valley
![Page 10: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/10.jpg)
90
Tectonic striae on mesofaults surfaces
80
90
60
70
angl
e)
SinistralDextralNormal-dextral
1
40
50
tria
e (D
ip a
Normal-sinistralReverse-dextralReverse-sinistral
30
40
Tect
onic
st
ReverseNormalHorizontal3
10
20
T HorizontalUnknown
354
00 10 20 30 40 50 60 70 80 90
2
Mesofaults (Dip angle)
![Page 11: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/11.jpg)
First („normal”) population
Datasets: 7
Hoeppener diagram
Angelier diagram
![Page 12: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/12.jpg)
First („normal”) populationPlanes:Planes:
-dominant NNE-SSW, NE-SW;
-steep (50-70º).
Slip lineations:
-dominant NW;
-steep (50-70º).
![Page 13: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/13.jpg)
First („normal”) population
Normal regimeThe Right Dihedra method
σ1 – 77/68
Normal regime
The Inverse method
σ2 – 212/16
σ3 – 307/15
![Page 14: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/14.jpg)
Predominant (second) population
Datasets: 25
Hoeppener diagramHoeppener diagram
Angelier diagram
![Page 15: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/15.jpg)
Predominant (second) population
Rose diagramPlanes:
-dominant NE-SW;;
-Steep and very steep (60-90º).
Rose diagram
Slip lineations:Slip lineations:
-dominant towards SW;;
-low and very low angles (0-20º).
![Page 16: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/16.jpg)
Predominant (second) population
Strike-slip regime
Right Dihedra methodσ1 – 38/11
σ2 – 256/76
Inverse method
σ2 256/76
σ3 – 130/08
![Page 17: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/17.jpg)
Third population
Datasets: 5
Hoeppener diagram
Angelier diagram
![Page 18: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/18.jpg)
Planes:
Third populationPlanes:
-dominant NE-SW;
intermediate angles to-intermediate angles to steep.
Slip lineations:
-dominant towards SW;
-intermediate angles (30-50º).
![Page 19: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/19.jpg)
Third population
Strike-slip regime
Normal regime
The Right Dihedra methodσ1 – 192/34
The Inverse method
σ2 – 356/55
σ3 – 97/08
![Page 20: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/20.jpg)
Fourth („Reverse”) population
Datasets: 2
Hoeppener diagram
Angelier diagram
![Page 21: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/21.jpg)
Planes:
Fourth („Reverse”) populationPlanes:
-dominant W-E, NW-SE;
-intermediate angles.
Slip lineations:
-dominant SW;
-low angles (20-30º).
![Page 22: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/22.jpg)
Fourth („Reverse”) population
Reverse regime
σ1 – 37/16
Reverse regime
The Right Dihedra method σ2 – 130/13
σ3 – 259/69
![Page 23: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/23.jpg)
Fifth („strike-slip”) population
Datasets: 5
Hoeppener diagram
Angelier diagram
![Page 24: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/24.jpg)
Planes:
Fifth („strike-slip”) populationPlanes:
-dominant NW-SE;
very steep (80 90º)-very steep (80-90º).
Slip lineations:Slip lineations:
-dominant SE;
low angles (10 20º)-low angles (10-20º).
![Page 25: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/25.jpg)
Fifth („strike-slip”) population
Strike-slip regime
The Right Dihedra methodσ1 – 294/06
The Inverse method
σ2 – 69/82
σ3 – 204/06
![Page 26: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/26.jpg)
Compressional (white) and tensional (black)tensional (black) sectors for every fault from the area of Karpaczarea of Karpacz on the basis of geological k t h f thsketch of the
studied area.
Karkonosze granite
Gneiss
Mica schistLower hemisphere
![Page 27: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/27.jpg)
ConclusionsConclusions-- StrikeStrike--slip faults are predominant;slip faults are predominant;StrikeStrike slip faults are predominant;slip faults are predominant;-- Fault planes Fault planes –– strike NEstrike NE--SW, steep and very steep;SW, steep and very steep;
Slip lineationsSlip lineations mostly towards SW low and very lowmostly towards SW low and very low-- Slip lineations Slip lineations –– mostly towards SW, low and very low mostly towards SW, low and very low angle;angle;
5 homogenous fault populations;5 homogenous fault populations;-- All possible regimes (strikeAll possible regimes (strike--slip, normal slip, normal ––
it ti l ) i l dit ti l ) i l d
-- 5 homogenous fault populations;5 homogenous fault populations;
gravitational, reverse) were involved;gravitational, reverse) were involved;-- Normal population is older than predominant;Normal population is older than predominant;
-- Predominant population was developed in strikePredominant population was developed in strike--slip slip regime (regime (σσ11 towards NEtowards NE--SWSW σσ33 towards NWtowards NW--SE);SE);regime (regime (σσ11 towards NEtowards NE SW, SW, σσ33 towards NWtowards NW SE);SE);-- Except one example Except one example σσ11 more or less towards NEmore or less towards NE--SW;SW;-- Except one example Except one example σσ33 more or less towards NWmore or less towards NW--SE.SE.
![Page 28: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/28.jpg)
σ1 – red
σ2 – black
σ3 – blue
![Page 29: Brittle faulting in the southern contact zone of the ... · Brittle faulting in the southern contact zone of the Karkonosze granite near Karpacz ... St dStudy area - south t t f th](https://reader031.fdocument.pub/reader031/viewer/2022021914/5c76de3109d3f2d3778c3416/html5/thumbnails/29.jpg)