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Geology of the PSEA > gop midterm exam > Flashcards

gop midterm exam Flashcards

1
Q
  1. The Pacific Plate is entirely composed of an oceanic lithosphere create since?
    a. 100 Ma
    b. 150 Ma
    c. 200 Ma
    d. 250 Ma
A

b. 150 Ma

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2
Q
  1. There are two generally accepted models of the origin of the West Philippine Basin:
    a. Trapped oceanic Basin & extrusion tectonics
    b. Back-Arc Basin & Trapped oceanic basin
    c. Extrusion tectonics and Back-arc basin
    d. Continental rifting and extrusion tectonics
A

b. Back-Arc Basin & Trapped oceanic basin

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3
Q
  1. Which of the following is an active submarine ridge in the Philippine Plate:
    a. Palau-Kyushu ridge
    b. West Mariana ridge
    c. Parece Vela - Shikoku ridge
    d. East Mariana ridge
A

d. East Mariana ridge

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4
Q
  1. The Pacific Plate have undergone a major kinematic reorganization, involving a 50-degree clockwise rotation with respect to hotspots, at around:
    a. 23 Ma
    b. 33 Ma
    c. 43 Ma
    d. 53 Ma
A

c. 43 Ma

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5
Q
  1. This basin divided into NW and SE subbasin by the Cagayan ridge.
    a. Sulu Sea Basin
    b. Celebes Sea Basin
    c. Visayas Sea Basin
    d. South China Sea Basin
A

a. Sulu Sea Basin

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6
Q
  1. The Taiwan collision zone is an example of
    a. Arc-arc collision
    b. Continent-arc collision
    c. Continent-continent collision
    d. Oceanic-continent collision
A

b. Continent-arc collision

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7
Q
  1. The age of the Philippine Trench, based on the consideration of the length of the subducting slab and the displacement rate of the Philippine Sea Plate, is:
    a. 1.1 Ma
    b. 2.1 Ma
    c. 3.1 Ma
    d. 4.1 Ma
A

c. 3.1 Ma

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8
Q
  1. The eastern limit of Shikoku Basin is:
    a. Palau-Kyushu ridge
    b. Izu-Bonin ridge
    c. West Mariana ridge
    d. Oki-Daito ridge
A

b. Izu-Bonin ridge

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9
Q
  1. Eurasia has been considered fixed since:
    a. 40 Ma
    b. 50 Ma
    c. 60 Ma
    d. 70 Ma
A

b. 50 Ma

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10
Q
  1. The most recent Mt. Pinatubo eruption occurred on:
    a. June 14, 1991
    b. June 15, 1991
    c. June 16, 1991
    d. June 17, 1991
A

b. June 15, 1991

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11
Q
  1. The Apolaki Caldera, which is considered as the world’s largest caldera, is located witthin:
    a. Oki-Daito Platform
    b. Urdaneta Plateau
    c. Benham Rise
    d. Parece Vela - Shikoku Basin
A

c. Benham Rise

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12
Q
  1. The South China Sea, according to some authors, formed by this model, India would impinge northwards against Eurasia which would cause the southeastward expulsion of the Indo-Chinese Block along large strike-slip faults where pull-apart extensional zones may be created and form basins.
    a. trapped Basin
    b. Atlantic-type rifting
    c. Back-Arc Basin
    d. Extrusion tectonics
A

d. Extrusion tectonics

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13
Q
  1. Which is NOT CORRECT about the Philippine Trench?
    a. It is formed by the subduction of the PSP under the Philippine Arc
    b. This subduction zone is young
    c. It has well-developed accretionary prism.
    d. The southern closure is still poorly known.
A

c. It has well-developed accretionary prism.

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14
Q
  1. This is the morphological expression of the subduction of the oceanic crust of the South China sea under the Luzon arc.
    a. East Luzon Trough
    b. Negros Trench
    c. Manila Trench
    d. Cotabato Trench
A

c. Manila Trench

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15
Q
  1. Which of the following subduction zones DOES NOT have a corresponding active volcanic arc?
    a. Philippine Trench
    b. Negros Trench
    c. Cotabato Trench
    d. East Luzon Trough
A

d. East Luzon Trough

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16
Q
  1. In the Negros trench, which oceanic crust is being consumed?
    a. Sulu Sea basin
    b. South China Sea Basin
    c. West Philippine basin
    d. Molluca Sea basin
A

a. Sulu Sea basin

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17
Q
  1. The metamorphic rocks of insular arc affinity are of what age?
    a. Jurassic
    b. Triassic
    c. Cretaceous
    d. Paleogene
A

c. Cretaceous

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18
Q
  1. The oldest known magmatic rocks in the Philippines are found in:
    a. Bohol
    b. Surigao
    c. Leyte
    d. Cebu
A

d. Cebu

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19
Q
  1. The thickest sedimentary basin, which has a sedimentary fill of more than 12,000 m, is the:
    a. Cotabato basin
    b. Agusan-Davao basin
    c. Samar Basin
    d. Cagayan Valley basin
A

b. Agusan-Davao basin

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20
Q
  1. The term “Philippine Fault” was first proposed by which author:
    a. Repetti
    b. Willis
    c. Aurelio
    d. Yumul
A

b. Willis

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21
Q
  1. The July 16, 1990 north Luzon earthquake, caused by themovement of the northern segment of the Philippine fault, had a magnitude of:
    a. 7.2
    b. 7.4
    c. 7.6
    d. 7.8
A

d. 7.8

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22
Q
  1. The central segment of the Philippine Fault is located from:
    a. Bondoc Peninsula to Surigao
    b. Lamon Bay to Bondoc Peninsula
    c. Bondoc Peninsula to Leyte
    d. SE Luson to Leyte
A

c. Bondoc Peninsula to Leyte

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23
Q
  1. According to the shear partitioning model of the Philippine Fault, the fault accomodates a component of the _________ convergence between the Philippine Sea Plate and the Philippine arc.
    a. normal
    b. parallel
    c. oblique
    d. direct
A

c. oblique

24
Q
  1. This fault consists of two NE trending faults. Based on paleo seismological studies, there have been approximately four earthquake occurence in the past 1500 years.
    a. Macolod Corridor
    b. Legaspi Lineament
    c. Marikina Valley Fault
    d. Mindanao Fault
A

c. Marikina Valley Fault

25
Q
  1. The northern continuation of the Mindanao Fault towards the northern Zamboanga is:
    a. Cotabato Fault
    b. Sindangan Fault
    c. Tablas Fault
    d. Aglubang Fault
A

b. Sindangan Fault

26
Q
  1. The oldest basement rock, which is of Middle Permian in age, is the?
A

Minilog Limestone

27
Q
  1. Composed of continental + oceanic, and is considered a single
    plate moving northwards
A

Indo-Australian Plate

28
Q
  1. It has a well developed accretionary prism.
A

Manila Trench

29
Q
  1. It has a corresponding active volcanic chain (eg. Canlaon)
A

Negros Trench

30
Q
  1. What type of collision is present in the Molluca Sea
A

Arc-arc collision

31
Q
  1. What is the age of metamorphic rocks of
    continental origin in the Philippines
A

Pre-Cretaceous

32
Q
  1. What is the age of oldest magmatic rock present in Cebu?
    and what magmatic rock is it?
A

Late Cretaceous;
Diorite

33
Q
  1. There are how many active volcanoes in the Philippines?
A

24 volcanoes

34
Q
  1. The Northern Segment of the Philippine Fault zone runs from _______ to ________.
A

NW Luzon to
Lamon Bay

35
Q
  1. The Southern Segment of the Philippine Fault zone runs from _______ to ________.
A

MIndanao and Mollucas

36
Q
  1. What is the mechanism of the Philippine Fault Zone?
A

Shear Partitioning

37
Q
  1. What is the eastern limit of Parece Vela ridge?
A

West Mariana ridge

38
Q
  1. These are closely-spaced, parallel or subparallel, overlapping or
    step-like minor structural features in rock (faults, tension
    fractures), which lie oblique to the overall structural trend
A

En-Echelon

39
Q
  1. The Marianas is split into two: West and East ridges, which one is currently active?
A

East Marianas

40
Q
  1. There are two studies about the old kenimatics of PSP, Measured in Taiwan and Japan, what are the ages respectively?
A

4 Ma to 6 Ma;
2 Ma to 3 Ma

41
Q
  1. It is composed of marginal basins. Thinned margin due to creation of oceanic crust.
A

Southeast Asian Margin

42
Q
  1. It is in solfataric stage w/ one active volcano
A

Sulu-Zamboanga Arc

43
Q
  1. What is the basement of the Southern Pacific Cordillera section of the Mindanao Pacific Cordillera?
A

Barcelona Formation

44
Q
  1. What is the basement of the Davao Basin section of Agusan-Davao Basin?
A

Kabagtican Formation

45
Q
  1. Boundary of Palawan microcontinental block and PMB
A

Tablas Lineament

46
Q
  1. A NW trending fault that is divided into two segment: Cotabato fault, and Sindangan fault
A

Mindanao fault

47
Q
  1. Give an example of volcano/es produced by the melting of detached slab.
A

Mt. Apo

48
Q
  1. Basins that have alternating limestone and marine clastic composition is and indication of?
A

Change in Sea level

49
Q
  1. It is a chaotic mass of rocks that formed due to submarine landslide.
A

Olistolith

50
Q
  1. The regional geodynamic setting (SEA and all the topics in the lesson) is divided into two:
A

Western Pacific Domain;
and Southeast Asian Tectonic Region

51
Q
  1. Located offshore of Batangas peninsula and Mindoro island, with NW-SE alignment.
A

Lubang-Verde Passage Fault System

52
Q
  1. It is a N-S trending dextral fault, caused a magnitude 7.1 earthquake on 1994
A

Mindoro/Aglubang Fault

53
Q
  1. What is the mechanism of Parece Vela-Shikoku and Marianas Basins?
A

Retreat of subducting slab

54
Q
  1. It is the relict volcanic arc of Middle Eocene to Oligocene age.
A

Palau-Kyushu ridge

55
Q
  1. The relative displacement rate varies (N to S) of PSP varies from from _________ to _________.
A

3.0 cm/yr;
to 9.0 cm/yr

Geology of the PSEA (3 decks)

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