Geology 05 Mark-Scheme

8/2/2019 Geology 05 Mark-Scheme

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MARKING SCHEMES

SUMMER2005

GEOLOGY.

PAPER 1

HIGHER TIER

Question Response Mark Sub

Mark

Total

1 a (i)

(ii)

(iii)(iv)

b (i)

(ii)

(iii)

(iv)

c (i)

(ii)

d

65 ma

325/65 = 5km per ma = 5mm per yeartransform (accept wrench or tear)

6.7

movement on faults/movement on San Andreas Fault

P wave

L wave

Highest amplitude/greatest vibrations or similar

Correct plotting

Collision of plates(1) subduction (1) of ocean crust (1)

friction between plates (1)Any 2 points

Destruction of buildings (1), death by burial/crushing (1),

outbreak of fire (1), loss of services (electricity, gas,

water, phone) (2)

destruction of infrastructure (roads, bridges, railways/

hospitals (1) disease (1) Any 3

1

1

11

1

1

1

1

1

2

2

3

4

5

4

3 16


2/5

2 a (i)

(ii)

(iii)

(iv)

b

Allow between 12 15 mm

sedimentary

D C E ( one correct 1)

Foliated or similar description (1) fragmental (accept

rounded) (1)

1 (1)

crystals foliated therefore formed under pressure (1)

medium/coarse grained high temperatures (1)

mineral composition medium grade (1)

regional metamorphism (1)

Give marks for explanation not description

1

1

2

2

4

6

4 10


3/5


Mark

Total

3 a (i)

(ii)

b

Plot of data

1 F 2 G

Grain size gets smaller/finer at the sea (1), grain shape

gets more rounded/rounded at the sea (1), due to

attrition/collision of grains (1), due to corrasion/rubbing

against river bed (1), fragments broken off (1)

Description max 2 explanation max 2 diagrams 2

2

2

6

4

6 10

4 a

b

c (i)(ii)

(iii)

d

Constructive plate margin/divergent plate margin

narrow base

steep slope

effusive

andesitic /acidic

High silica content increases viscosity (1), high viscosity

prevents escape of gas (1), andesitic high viscosity and

explosive (1), andesitic high silica and high viscosity,

andesitic lava and pyroclastics block the vent and trap gas

(1) (or reverse of argument for basalt)

Any 3 pointsPlot of data

Heavy/coarse particles fall to earth near the vent (1),

smaller/lighter particles carried further by the wind (1),

most of the material is too heavy/large to be carried by the

wind

Any 2 points

Loose ash and mud mix to form mud flow (1), flows

down valleys (1), destroys property (1), risk of drowning

(1)

Any 2

Partial melting (1), of mantle (1),beneath ocean ridge / mantle plume (1)

Any 2 points

1

1

1

1

1

3

2

2

2

2

5

3

6

2 16


4/5


Mark

Total

5 a (i)

(ii)

(iii)(iv)

(v)

b

M 2 (1) N many (1)

Planes of symmetry on M and N

L coral (1) M brachiopod (1)Hard upper surface lived on bottom (1) legs

crawler/walking (1)

Absence of eyes burrower/deep water (1), spines for

digging/protection against predators (1)

Either carbonisation (1), loss of volatiles (1), enrichment

in carbon (1)

Cast (1), hollow stem (1), filled with sediment (1)

Name (1) description (1)

Or coalabundant plant material - terrestrial (1) swamp

(1) plant roots in situ (1) fossil soil (1), shale scattered

plant fragments - water currents (1)Any 4 points for interpretation not description from

diagram

2

2

22

2

4

4

10

4

4 14

6 a (i)

(ii)

(iii)

(iv)

(v)

b (i)(ii)

(iii)

c

Correct position of fold axis

Correct diagram with way up arrow

unconformity

oolitic limestone (1), underneath (1)

dolerite and/or coarse sandstone (1), pebbles in

conglomerate (1)

700ma

300ma

1:1 or 50:50

relative to other rocks (1) absolute is age in millions of

years (1)

1

1

2

1

4

11

1

2

9

3

2 14


5/5


Mark

Total

7 a (i)

(ii)

(iii)(iv)

b (i)

(ii)

c

2.5 3.5 (1), SiO2 (1), chalcopyrite (1)

R

looks like a metal (1) reflects light (1)Q R P

2

diluted further from vein (1)

Either from a granite(1) magma (1), water concentrated

(1) in late stage of cooling (1) elements (minerals)

dissolved in fluid (1) explosively released into country

rock (1) fractures country rock (1) fluid enters veins(1)

cools (1)precipitates (1)

Alternatively groundwater (1)heated by proximity of

granite (1) or deep burial(1)convects (1)rises and cools

(1)in veins/joints/ faults(1) precipitates (1)Any 4 points

Or analysis of stream sediment (1), insoluble elements

(1), more concentrated near deposit (1)

Analysis of soil (1), reveals hidden ore body (1), more

concentrated near ore body and dispersed away (1)

Gravity (1) detects anomalies (1)detects rocks associated

with mineral ores (1), e.g. granite/gabbro

Magnetic (1) detects anomalies (1), detects rocks

associated with mineral ores (1) e.g. gabbro (1)

Seismic (1) detects suitable structures (faults) (1)

Two methods, 2 marks each

3

1

22

1

1

4

4

8

2

4

4 14

8 a

b

c

d

Correct position of water table

Water passes through sandstone (1), stops at impermeable

shale (1), lubricates boundary (1), overlying sandstone

slides (1)

Any 2 points

South (1), steep dip (1), towards reservoir (1)

Any 2 points

Surge of water over dam (1), dam failure (1), flooding

downstream (1)

Any point

1

2

2

1

1

2

2

1 6

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Geology 05 Mark-Scheme