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Gullet Quarry- Igneous Investigation.

Extracts from this document...

Introduction

Gullet Quarry- Igneous Investigation. Investigation. : To study the igneous intrusions at Gullet Quarry Aims : 1. To investigate whether the intrusions are of the same age. 2. To investigate whether the intrusions are the same type. 3. To investigate whether they are all from the same magma source. 4. To determine a sequence of events in the igneous section of the quarry. Plan : To carry out this investigation I will need the following equipment: hand lens, geologists hammer, crystal size card, ruler, tape measure, clinometer, penknife and a streak plate. In collecting the data to carry out this investigation I am proposing all the evidence will be uniform and will conform with the igneous work I have learnt in class. If there are any anomalous results in my data I will do my best to fit the anomalous result into my work. The evidence I am looking for is as follows:- 1. Crystal size. Crystal size is an important variable in determining the origin of the igneous rocks. The crystal size depends on how deep the rock was when it was formed. Finer crystals indicate that the rocks were cooled at a rapid rate i.e. near the surface of the earth. The larger the crystals are the slower the crystals were formed. Larger crystals show that the rocks were formed deep into the earth's mantle. To investigate crystal size I will need a hand lens, a crystal size card and a ruler. To investigate crystal size I will hold the hand lens about 5cm away from the rock and use the crystal size card to compare the crystal size to the crystal size on the card. ...read more.

Middle

and roughly fit in with each other accept from reading c which still goes along with the trend to the south but has a great difference in degrees to the rest of the readings. From the table showing the results for section D, I do not think that I can make any prediction on whether the intrusion is a dyke or a sill because the readings are very different. I think that intrusion A is a sill, Intrusion B is a sill, Intrusion C is a sill and I do not know whether the intrusion of section D is a dyke or a sill. Aim 3. This aim was to find out whether the intrusions came from different or the same magma source. To find this out I looked at the percentage of different minerals in each intrusion. The results are shown below in graphs. Intrusion A Intrusion B Intrusion C Intrusion D. The graphs show what the mineral content of the intrusions are. In section A the intrusions have 85% feldspar and 15% quartz. In section B the intrusion has got 60% feldspar, 20% mica and 20% Quartz. In section C the intrusion has 95% feldspar and 5% mica. In section D the intrusion has 15% mica, 65% feldspar and 20% quartz. From this evidence it would appear that there is no correlation between the intrusions in sections A and B, but if you look at the graphs for sections B and D the two intrusions have roughly the same mineral content which should mean that they come from the same magma source. ...read more.

Conclusion

The next table is a revised version of the observation table but with the estimated totals put in. No. of times the jelly is poured down the slope. Time taken to reach the end of the wood on the smooth side of the board. Time taken to reach the end of the wood on the rough side of the board. 1 20secs 156secs 2 62secs 141secs 3 111secs 224secs 4 79secs 150secs 5 30secs 216secs The next 2 graphs show the difference between the two surfaces using the median average which is the middle result between the 5 results. From this experiment I have discovered that if the slope of a volcano is smooth the lava will flow quicker than on a rough surface. This has proved my prediction that if the surface is smooth the lava would flow over the slope at a quicker pace than if the slope is rough. Evaluation. I feel that my results are as accurate as can be expected with out using a computerised method of recording the results. I believe that the experiment I did was suitable because it has proved that lava flows better over a smooth surface rather than a rough surface. I found that the first and the last time I ran the jelly down the smooth side of wood the times had a big difference to the other times I ran the jelly down the smooth side of the board. I could improve the accuracy of my results by having another person starting and stopping the stop watch. I could do a further investigation to find out if lava flows better with air pockets in it or not. ...read more.

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