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Geologic and Paleomagnetic Evidence For A Possible Miocene Collision in Western Panay, Central Philippines: Reaction Paper

1) The document discusses a study that provides geologic and paleomagnetic evidence for a possible collision during the Miocene period in western Panay Island in the central Philippines. 2) The evidence shows characteristics of a collision zone such as a lack of subduction and occurrence of thrust belts. Diagrams show a block colliding with an island arc. 3) Paleomagnetic evidence from drilled cores supports the geologic evidence and collision model of a counterclockwise rotation north and clockwise rotation south of the collision zone.

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Charlie Danforth
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60 views2 pages

Geologic and Paleomagnetic Evidence For A Possible Miocene Collision in Western Panay, Central Philippines: Reaction Paper

1) The document discusses a study that provides geologic and paleomagnetic evidence for a possible collision during the Miocene period in western Panay Island in the central Philippines. 2) The evidence shows characteristics of a collision zone such as a lack of subduction and occurrence of thrust belts. Diagrams show a block colliding with an island arc. 3) Paleomagnetic evidence from drilled cores supports the geologic evidence and collision model of a counterclockwise rotation north and clockwise rotation south of the collision zone.

Uploaded by

Charlie Danforth
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as ODT, PDF, TXT or read online on Scribd
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Gonzales, Jonathan Z.

Sat 10:30-13:30
201220118 September 9, 2017
Prof. Bacolcol

Geologic and Paleomagnetic Evidence for a Possible Miocene


Collision in Western Panay, Central Philippines: Reaction paper
Robert McGabe, Jose Almasco, and Wilfredo Diegor

The study is about the the possible collision during Miocene in the western side of
Panay Island, presented by the geologic evidence and paleomagnetic evidence. The study
is quite interesting because in the past literature, we focused on Palawan block, which
consists of continental crust, and its interaction with Manila Trench.

Even before the study, I noticed on maps that there is no subduction zone between
the Manila Trench and the Negros Trench, but I did not know that it is an evidence of an
important event. This geologic evidence, together with the lack of volcanism related to
subduction around the area, and occurrence of thrust belts, clearly show a collision zone. I
tend to agree to the authors conclusion because I was convinced by their evidence. I was
persuaded more after observing the diagram presented in the literature, showing that there
was a block located on a subducting crust that collided with an island arc, forming the
counterclockwise rotation on the north and clockwise rotation on the south of the collision
zone. Their model was even more supported by the paleomagnetic evidence, which are
consistent to the evidence shown by the geologic characteristics and structures in the
area.

Now, I learned that the Panay Island must be part of the continental block in
Palawan, and this is the reason why there is no active subduction zone in the area, which
is a question I kept asking myself but never bothered myself before to somehow study the
answer.

The method used in getting paleomagnetism from drilled cores were not discussed
thoroughly. Maybe the authors have thought that it is not necessary to explain and the
readers should have some knowledge of demagnetization process. I became quite
interested as the alternating field demagnetization seems new to me.

The study was written in a concise manner. I love it because the explanations were
very clear and only use simple words. The authors also provided necessary diagrams to
support the well-written literature. I would recommend the study for those who want to
learn Philippine tectonics, especially in the area of Panay Island. The authors also clarified
that the Panay Island is not necessarily lacking of rotation, but in fact had some rotation.
The clarification served as their recommendation for future study.

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