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Day 1: Board Exam > GEOPSEA EXAM 1 > Flashcards

GEOPSEA EXAM 1 Flashcards

1
Q

The major kinematic reorganization of the Pacific Plate at around 43 Ma involves _ rotation with respect to hotspots.

A

50 degrees clockwise

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2
Q

The absolute velocity of the Pacific plate is:

A

80 mm/yr

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3
Q

The Pacific plate subducts under the Philippine Sea Plate along:

A

Bonin-Marianas-Yap trench system

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4
Q

The deepest trench in this planet is:

A

Marianas trench

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5
Q

The submarine plateaus in the West Philippine Basin are:

A

benham rise, urdaneta plateau, oki-daito ridges

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6
Q

the trend of the Central Basin Fault is

A

WNW-ESE

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7
Q

The opening of the Parece Vela-Shikoku and the Marianas Basin involves what mechanism?

A

retreat of subducting slab

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8
Q

The Palau-Kyushu Ridge separates which two basins?

A

parece vela-shikoku and west philippine basin

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9
Q

this ridge splits into two branches towards the south as the West and East Marianas Ridges:

A

Izu-Bonin Ridge

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10
Q

Which of the following volcanic arcs is presently active?

A

East mariana ridge

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11
Q

The Philippine Sea Plate/Eurasia rotation pole is located

A

NE of Japan

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12
Q

The relative displacement rate of Philippine Sea Plate and Eurasia is:

A

7.0 cm/yr

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13
Q

The directional change of the Philippine Sea Plate between 4 and 6 Ma involves_rotation

A

45 degrees counterclockwise

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14
Q

Which of the following collision zones involves arc-continent interaction?

-taiwan
-moluccas
-philippine trench
-east luzon trough

A

Taiwan

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15
Q

The Sulu-Zamboanga Arc separates:

A

Sulu Sea and Celebes Sea

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16
Q

A back-arc basin is formed:

A

behind a subduction zone

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17
Q

Which of the following oceanic basins have been studied as an example of a trapped basin?

-south china sea
-marianas
-parece vela-shikoku
-west philippine basin

A

west philippine basin

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18
Q

The term Philippine Mobile Belt was first defined by which author?

A

Gervasio

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19
Q

Which of the following DOES NOT indicate that the Philippine trench is young?

-deep Benioff zone
-well developed accretionary prism
-southern termination poorly known
-none of the above

A

deep Benioff zone

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20
Q

This is the morphologic expression of the subduction of the oceanic crust of the South China Sea under the Luzon arc

A

Manila Trench

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21
Q

This fault links the Cotabato Trench with the Negros Trench

A

Cotabato Trench

22
Q

In which of the following islands are pre-Cretaceous metamorphic rocks NOT likely to be found?

-north palawan
-mindoro
-panay
-davao oriental

A

Davao Oriental

23
Q

The collision of the Halmahera and Sangihe is an example of:

A

arc-arc collision

24
Q

The islands in the Philippine Mobile Belt originated from

A

sub-equatorial regions

25
Q

The following are pre-Cretaceous metamorphic rocks, EXCEPT:

-Caramay Schist
-Halcon Metamorphic COmplex
-Tungauan Schist
-none of the above

A

none of the above

26
Q

The age of ophiolitic rocks is based on the age of the:

a. pillow basalts
b. pelagic sediments
c. sheeted dikes
d. layered gabbro

A

b. pelagic sediments

27
Q

The oldest known magmatic rocks in the Philippines are found in Cebu Island. This rock is a

A

Diorite

28
Q

The Aroroy Diorite is an intrusive body found in

A

Masbate

29
Q

This is an intrusive body found in the island of Panay

A

Sara Diorite

30
Q

Mount Apo, was proposed to have formed from:

A

partial melting of detached slab

31
Q

Bud Dajo is an active volcano in

A

Sulu

32
Q

Which of the following sedimentary basins is not traversed by the Philippine Fault:

-southern luzon-bicol basin
-mindoro basin
-agusan-davao basin
-ilocos-central luzon basin

A

mindoro basin

33
Q

The Philippine Fault was designated by various terms by different authors. One of which is Repetti, who named this fault as:

A

Master Fault

34
Q

What is the mode of displacement of the Philippine Fault?

A

Left-Lateral

35
Q

The March 17, 1973 southern Luzon earthquake, of the Philippine Fault, had an epicenter located in

A

Ragang Gulf

36
Q

The northern segment of the Philippine Fault is characterized by:

A

transpressional regime

37
Q

This feature corresponds to the NNE-SSW alignment of active volcanoes such as Taal, Banahaw, Makiling, and maars of Laguna province.

A

Macolod Corridor

38
Q

Which of the following faults is characterized by normal faulting?

-sindangan fault
-cotabato fault
-tablas lineament
-legaspi lineament

A

cotabato fault

39
Q

This fault is a tectonic boundary between the Palawan-Mindoro microcontinental block and western edge of the Philippine Mobile Belt

A

Tablas Lineament

40
Q

The Tablas Lineament is characterized by what type of displacement?

A

right-lateral

41
Q

the basement rock of the Southern Pacific Cordillera is the

A

Barcelona Formation

42
Q

This constitutes the basement rocks of the Central Pacific Cordillera. It is characterized by andesitic flows and pyroclastic basement believed to be of Eocene age?/

A

Anoling Andesite

43
Q

This unit refers to the Holocene volcanic deposits of Lake Leonard in Davao. This volcanic activity is manifested as domes, plugs, flows and pyroclastic rocks of andesitic to dacitic composition

A

Amacan Volcano Complex

44
Q

This formation was named by San Jose Oil Company for the exposures along a river in Prosperidad, Agusan del Sur. An angular unconformity separates this from the underlying formation.

A

Wawa Formation

45
Q

This represents the well-defined rhythmic interbeds of indurated thin sandstones and shales of Early Miocene age in the core of the Kilagden Anticline of Asuncion, Davao del Norte

A

Kabagtican Formation

46
Q

At 50 Ma, there was a south-dipping subduction north of the Philippine Sea Plate which is the _ . Its subduction may have driven the spreading of the West Philippine Sea.

A

Northern New Guinea Plate

47
Q

In the plate reconstruction by Hall, during which time did the Palawan-Mindoro microcontinent start rifting from the eastern edge of the Eurasian Plate?

A

35 Ma

48
Q

Which of the following significant events happened 5 Ma ago?

A

Luzon arc came into collision with Taiwan

49
Q

Spreading in the West Philippine-Celebes Sea basin had ceased:

A

30 Ma ago

50
Q

The East Philippine Arc was formed by the subduction of _ under _ .

A

Indo-Australian plate, proto-South China Sea

Day 1: Board Exam (16 decks)

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