Structural Observation- Sungai Batu Pahat

Outcrop 3.1

Qs 270169 E

635259N

• Granite cross cutting the Pegmatite

• Presence of Pegmatite vein

• There are 4 pegmatite vein which can further divide into 3 types

Angle: 217˚; Thickness: 2.6m​ [ Type of Pegmatite: Normal ]

Angle: 215˚; Thickness: 5.5 cm [ Type of Pegmatite :Shifted ]

Angle: 221˚; Thickness: 7.0 cm [ Type of Pegmatite : With tourmaline at the margin ]

Angle: 213˚; Thickness: 15.0 cm [ Type of Pegmatite : Banded ]

Presence of Xenolith

• Cognate Xenolith: Segregation of mafic minerals come together to form cog due to magnetic susceptibility. Cognate is iron based, So the surrounded area will be in the brown colour.

• Accidental Xenolith: A pre-existing rock that accidentally fall into magma. Then it melts and the remaining crystallization happen together with the magma.

• Presence of exfoliation

• Can observed sharp boundary between Granite and Pegmatite

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Outcrop 3.2

Qs 270208 E

635630N

• Presence of Pegmatite vein

1. Angle: 10˚; Thickness: 42.5cm

2. Angle: 61˚; Thickness: 7.0 cm

3. Angle: 24˚; Thickness: 2.0 cm

4. Angle: 238˚; Thickness: 4.5 cm

5. Angle: 63˚; Thickness: 2.7 cm

6. Angle: 40˚; Thickness: 180 cm

7. Angle: 45˚; Thickness: 21 cm [ Branch out into 2 parts ]

8. Angle: 32˚; Thickness: 21 cm [ Branch out into 2 parts ]

9. Angle: 155˚; Thickness: 13.5 cm

• Exfoliation fracture can be observed

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Outcrop 3.3

Qs 270182 E

635675N

• Presence of fractures

• 3 sets of fracture can be observed

• Presence of Pegmatite vein

1. Angle: 47˚; Thickness: 80 cm

2. Angle: 62˚; Thickness: 110.0 cm

3. Angle: 61˚; Thickness: 4.0 cm

4. Angle: 40˚; Thickness: 7.0 cm

5. Angle: 40˚; Thickness: 18.0 cm

6. Angle: 40˚; Thickness: 59.0 cm

7. Angle: 26˚; Thickness: 72 cm

8. Angle: 60˚; Thickness: 24.5 cm

• Presence of Tourmaline string

1. Angle: 58˚; Thickness: 0.5 cm

2. Angle: 240˚; Thickness: 1.5 cm

3. Angle: 260˚; Thickness: 1.8 cm [ Quartz and feldspar present ]

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Outcrop 3.4

Qs 270149 E

635722N

• Presence of Pegmatite block

• Tourmaline observed in acicular shape

• Presence of Sinistral Fault and Tourmaline string

• Sinistral fault cutting through the tourmaline string

• We observed Pegmatite shifting due to the fault