uts geologi struktur 2012-2013

5/26/2018 UTS Geologi Struktur 2012-2013

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DEPARTEMEN PENDIDIKAN DAN KEBUDAYAANUNIVERSITAS BRAWIJAYA,FAKULTAS MIPA

UJIAN TENGAH SEMESTER GANJIL 2012/2013

Mata kuliah : Geologi Struktur Hari / tanggal : okt 2012Dosen : Adi Susilo, PhD, Dr.Arief Rah!ans"ah #aktu : $0 !enit%urusan : &isika Sifat : 'utu( )uku

Tuli !"# $"#!" $"#%"#i &'(#)"$""# i#i !i l'*+"( "-"+"# "u!"(" .Saya bersedia menerima sangsi sesuai ketentuan yang berlaku jika melakukankecurangan selama ujian berlangsung.

SOAL

1. Terms used to describe surfaces across which there has been perceptible

displacement are many. However, most geologists would prefer one of the falling

terms: (a) joints, (b) fractures, (c) cracs, or (d) faults. !hat term best describes a

surface across which there has been perceptible displacement"

#. $orce is a term common to physics. %ts classical e&pression is $orce ' mass

acceleration. However geologists are more concerned with the intensity of force or

more succinctly the stress. tress is defined as ********************** .

+. tresses produce strains in arth materials. !hat are strains"

-. There are two endmember varieties of faults: dipslip and strieslip. The

displacement along a strieslip fault is ***************** to the strie of the

fault.

/. The orientation of a plane in space is e&pressed by its attitude0 a term consisting of

two components, strie and dip. efine strie. efine dip.

2. Though many beds are upright others are not. $or e&ample, an overturned bed is

one that has been rotated more than ********** degrees.

3. 4 dipslip fault consists of the dipping fault surface and hanging and footwallblocs. The hanging wall bloc lies ************ the dipping fault surface.

5. %n the following illustration what bloc is the !hite 6ine located on" !hat blocis the 7aple located on" !hat ind of fault is illustrated"

8. The footwall bloc lies *********** a dipping fault surface.


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19. !hat do you call a three dimensional surface separating arth material of differing

aspect"

11. %n a dipslip fault, if the hanging wall bloc moved up relative to the footwall

bloc, then the fault is classified as a ******************** .

1#. %n a dipslip fault, if the hanging wall bloc moved down relative to the footwallbloc, then the fault is classified as a ******************** .

1+. %n the following illustration what bloc is the !illow located on" !hat ind of

fault is illustrated"

1-. %magine the following. 4 road is cut by a vertical dipping fault. 4s you wal

along the road toward the fault, at the intersection of the fault and road, you have to

turn to your right and wal some distance along the fault until you encounter the

continuation of the road. !hat would you call the fault"

1/. %magine the following. 4 set of rail road tracs are cut by a vertical dipping fault.

4s you wal along the railroad tracs toward the fault, at the intersection of the

tracs and the fault, you have to turn to your left and wal about 19 meters along

the fault until you encounter the continuation of the railroad tracs. !hat wouldyou call the fault"

12. %n the following bloc diagram, what ind of fault is illustrated"

13. %n the following bloc diagram, what ind of fault is illustrated"

15. $olds are either anticlines or synclines. 7any large hydrocarbon reservoirs occur

within the cores of anticlines while adjacent synclines may contain the source of

such material. $olds are ******************** distortions of roc bodies.


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18. Tae a piece of paper and bend it into a fold. ow visually locate the locus of all

points of ma&imum curvature on the folded piece of paper. %magine now that the

folded piece of paper is a bed of sandstone, + meters thic and e&tending over a 1

s;uare ilometer area. The locus of all ma&imum points of curvature on a folded

layer is termed the ********************.

#9. Tae a boo from your pac or boo shelf.


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#5. 6lease answer the ;uestion shown on the following illustration.

#8. !hich of the following is not a stress term" (a) mega6ascal, (b) 6ascal, (c)

ilobars, (d) ilometers

+9. 6lastic material when stressed beyond a certain critical point called the yield stress

flows readily. 4fter unloading (i.e., removing the imposed stress) a plastic material

it will ***********************.

uts geologi struktur 2012-2013

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