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GEOLOGY FIELD TRIP PRESENTATION

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on 18 December 2012

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Transcript of GEOLOGY FIELD TRIP PRESENTATION

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli GROUP MEMBERS :

2) NURUL SUAIDAH BT MUTAZAH
3) MUHAMAD AFIQ BIN SAHARUDIN
4)NICK FARHAN ZAKIRAN BIN MAHADI
5)SYARIFAH IFFAHANIM BT SAIYED ISMAIL
6)UMI MASLINDA BT ANUAR FIELD TRIP GEOLOGY PRESENTATION OF GUNUNG JERAI FORMATION, KEDAH OBJECCTIVES TO OBSERVE AND STUDY :
THE SUBJECT OF NUMEROUS ROCK AND ROCK-FORMING MINERAL (i.e. IGNEOUS AND METAMORPHIC)
STRUCTURE AND DEFORMATION FEATURES
STRATIGRAPHY AND FACIES
GEOLOGICAL PHENOMENON GENERAL GEOLOGY GUNUNG JERAI FORMED BY GRANITE PLUTONIC INTRUSION. ITS SURROUNDING ROCKS KNOWN AS JERAI FORMATION (CAMBRIAN) HAS BEEN DEFORMED AND METAMORPHOSED BY GRANITE. SERI PERIGI WATERFALL A) SKETCH AND GEOLOGICAL SETTING OF THE AREA TANJUNG JAGA Metamorphic rock of Jerai Formation together with granite and pegmatite is exposed here.
Metamorphic rock consist of quartzite and schist, contain of biotite, muscovite, garnet and tourmaline.
this rock was intruded by quartz dyke and pegmatite vein. MERBOK WATERFALL Jerai granite outcrops can be obtained in the river.
Pegmatite and quartz dyke intersect with the granite .
Pegmatite sill can be found here.
Surrounding rock deposits can be seen inside the granite known as xenolith. ORIGIN OF XENOLITH ROCK Most often occur in igneous rock.
Xenolith is a large piece of country rock that has been broken off and/or surrounded by an igneous intrusion.
As the magma intrudes the country rock it may completely surround large pieces.
These pieces are then called xenoliths. 1) AHMAD SAYFUL BIN MOHAMAD GEOLOGICAL SITES 1) SERI PERIGI WATERFALL
2) TANJUNG JAGA
3) MERBOK WATERFALL In general, Seri Perigi waterfall is a waterfall in Yan District, Kedah.
It is on the slope of Gunung Jerai and is roughly to the north-east of the peak.
A two tier waterfall that cascades 100m down a rocky steep slopes as the stream flows from the top of Gunung Jerai.
A thick layered of metaquartzite can be observed and it inclined uniformly toward Northeast. There are a cross bedding signature that can be observed in this layer.
Intruded by quartz dyke and pegmatite sill with a coarse grain and contains quartz, feldspar-K and muscovite.
At the base of the waterfall, it can observe that the colour of the water is brownish due to chemical weathering-oxidation of rocks mineral with oxygen (i.e feldspar-K) STRIKE AND DIP FOR JOINT AND LAYER WHY WATERFALL EXIST IN THIS AREA? Waterfalls form where water rushes down steep hillsides and quickly erodes the rocks.
Where there is a layer of hard rock overlies a layer of soft rock.
As the river or stream wears away the weak rocks, they travel across the surface of stronger rocks.
the river can erode the soft rock more easily, and produces a step.
Eventually, the step is deepened, and a waterfall is formed.
Due to hydraulic action and abrasion, a plunge pool at the bottom of the waterfall is created after time.
Further erosion undercuts the hard rock, leaving it to overhang the plungepool.
Eventually, the overhang collapses into the plunge pool, and the waterfall retreats its position. THE RELATIONSHIP BETWEEN RIVER STREAM AND THE SURROUNDING ROCKS IN THIS AREA PEGMATITE
SILL River stream flows from northeast.
meta-quartzite rocks-undergo chemical weathering when react with water.
causes decomposition of feldspar-K mineral-color of water become brownish. MINERALS THAT CAN BE OBTAINED QUARTZ MICA
MUSCOVITE MICA BIOTITE FELDSPAR TOURMALINE IN-SITU EVIDENCE FOR PEGMATITE AND QUARTZ INTRUSION INTO METAMORPHIC ROCK PRINCIPLE OF INCLUSION PRINCIPLE OF INTRUSION Figure 1 Dip: 40; strike: 8 NW Figure 2 Dip: 88; strike: 70 SE Figure 3 Dip: 21; Strike: 10 SW GEOLOGICAL SETTING THE TEXTURE OF GRANITE phaneritic texture
crystalline structure
form from slow cooling
coarse-grained
crystals visible without magnification MINERALS OBTAINED INSIDE THE GRANITE AND PEGMATITE GRANITE PEGMATITE quartz
feldspar
mica biotite mica muscovite
mica biotite
feldspar
quartz PRINCIPLE OF GEOLOGY younger older younger older
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