GOP

Question 1

3 plates surrounding the philippines

Answer 1

Pacific plate
Eurasian plate
Indo-asutralian plates

Question 2

• composed entirely of oceanic crust
• age of 150 MY (Late jurassic)
• 80mm, 8 cm / year movement

Answer 2

Pacific plate

Question 3

At 43 MY (Eocene) the pacific plate moves at ?

Answer 3

50d egrees Counter clockwise rotation from NNW to WNW

Question 4

At 5 MY (late miocene) the pacific plate moves at?

Answer 4

10 degrees counter Clockwise rotation

Question 5

Pacific sea plate subducts along ______ , ________, and __________

Answer 5

• Eurasian plate along japan trench
• under philippine sea plate along bonin-marianas trench
• Indo-Australian plate east of new zealand

Question 6

Rate of movement of eurasian plate

Answer 6

3mm/ year since 50 MY (late miocene)

Question 7

Plate composed of both oceanic and continental plates

Answer 7

Indo-australian plate

Question 8

Rate of movement of the indo-australian plate

Answer 8

107 mm/ year with a northward motion

Question 9

The continental portion of the indo-australian plate collides with the _______

Answer 9

Eurasian (Himalayas)

Question 10

The oceanic portion of the indo-australian plate subducts under the ________

Answer 10

Eurasian along the Java Trench

Question 11

Occupies almost 50% of the phil sea plate

Answer 11

West Philippine Basin

Question 12

Age of west philippine sea basin based on the paleomagnetic data

Answer 12

60 - 35 Ma

Question 13

Age of the west philippine sea basin based on deep sea drilling

Answer 13

53-42 Ma

Question 14

3 submarine plateaus in the west philippine sea basin

Answer 14

1. Benham Rise
2. Urdaneta Plateau
3. Anami and Oki-Daito Ridges

Question 15

• an extinct MOR that trends WNW to ESE

- caused the expansion of the west philippine sea basin

Answer 15

Central Basin Fault

Question 16

2 models of the basin’s origin

Answer 16

1. Trapped oceanic basinby Uyeda and Ben-abraham

2. Back arc basin model by Karig, mrozowki, sena, and maruyama

Question 17

Model of the WPB that states that the Oki-daito would correspond to a relict volcanic arc that travelled to the NE during the opening of the basin

Answer 17

Back arc basin model

Question 18

Oceanic crust of the WPB that accelerates on a N-S spreading axis

Answer 18

Parece Vela-Shikoku Basin
- 1st stage: 30 Ma - Parece Vela
- 2nd stage: 10 Ma - shikoku
Stops at 17 Ma

Question 19

• Basin the opens around 6 Ma and presently active
• the opening of the basin is usually associated with an eastward migration of the subduction of the pacific plate under the philippine sea plate

Answer 19

Marianas Basin

Question 20

The poorly known portion on the southern extremity of the Phil sea plate

Answer 20

Ayu Basin

Question 21

• divides the WPB from the PVSB

- Considered as a relic volcanic arc of middle eocene to oligocene age

Answer 21

Palau-Kyushu Ridge (2500km)

Question 22

• Eastern limit of the shikoku basin

- represent the volcanic arc of the presently active bonin trench colliding with the japanese margin

Answer 22

Izu-Bonin Ridge

Question 23

2 branches or parts of the Izu-Bonin Ridge

Answer 23

West Marianas Ridge

East Marianas Ridge

Question 24

Ancient volcanic arc active between 20 to 9 Ma

-part of the izu bonin ridge

Answer 24

West Marianas Ridge

Question 25

-Volcanic arc of the presently active marianas trench

Answer 25

East Marianas Ridge

Question 26

The PSP subducts NW under the japanese archipelago along the _______ and ________

Answer 26

Nankai and Ryuku Trench

Question 27

The PSP subducts SW into the philippine archipelago along the ______

Answer 27

Philippine Trench System

Question 28

The eastern part of the PSP is defined by the _______, _______ and ________

Answer 28

Bonin Trench, Marianas Trench, and Yap trench

Question 29

Rotation pole of the psp is located at the

Answer 29

NE of Japan

Question 30

NW and SW displacement of the PSP are ?

Answer 30

NW - 3 cm/yr | SW - 9 cm/yr

Question 31

Reltive displacement direction of the PSP whos azimuth is directed at ______

Answer 31

N55W near taiwan with a linear velocity around 7cm/yr

Question 32

Marginal basins: eurasian affinity - basin with a depth of 4km Opening was precede by rifting that could have taken place between the late cretaceous and late eocene

Answer 32

South china sea basin

Question 33

What triggred/caused the opening of the south china sea?

Answer 33

India-eurasian collision (extrusion tectonics)

Question 34

Basin Situated immediately to the southeast of palawan, formed 20 Ma

Answer 34

Sulu sea basin

Question 35

Ridge seperating the sulu sea basin into NW and SE sub-basin

Answer 35

Cagayan de Sulu Ridge

Question 36

Ridge the separates the sulu sea basin and celebes sea basin

Answer 36

Sul-zamboanga ridge

Question 37

Basin located asoutheast of sulu and the sulu-zamboanga arc. Aged 55-42 Ma (eocene). The age was suported by rediolarian dating of pelagic sediments blanketing the MORB-like oceanic basement

Answer 37

Celebes Sea Basin

Question 38

- the westward subduction of the PSP under the eastern philippine arc - 250 km - age of 5 Ma - fvolcanic arc from bicol to leyte - west dippinh subduction

Answer 38

Philippine trench