Luzon Volcanic Arc

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Smith Volcano in the Babuyan Islands

The Luzon Volcanic Arc is a

calc-alkaline characteristics). Isotopes and trace elements show unique geochemical characteristics in the north. Geochemical variations northward (Babuyan segment) were due to the subduction of sediments derived from the erosion of continental crust
from China and Taiwan.

There is a distinct increase in

strontium isotopic ratios with latitude northward. This supports the conjecture that the variations were due to an increasing "crustal" component in subducted sediments as the continental blocks in the north were approached (China and Taiwan). The sediment thicknesses increased toward the north along the trench.[4]

The geochemistry and tectonic setting of the southern Luzon arc has been studied in detail.[5] The geochemistry suggested that continental crust (probably from sediments) played an important role in the Macolod corridor[6] and the Mindoro segments. Crustal collision had occurred in the south between the North Palawan-Mindoro crustal block and perhaps sediment contamination was derived from this region. This substantiates preliminary early isotope and trace element studies on the central Luzon arc[7][8]

Further work was done on the northern Luzon arc by McDermott et al.[9] who found systematic variations in an assortment of isotopes with latitude not only in the lavas analyzed over the 500 km section of the arc but also in sediments along the trench. The only way to explain the latitudinal variations was through the addition of an increasing input of terrigenous sediments toward the continental regions in the north China and Taiwan

During the

Ma, activity started in Taiwan. Batan Island volcanics are dated at 9.36 Ma, while north of Luzon, the volcanic islands are younger than 6.5 Ma.[10]

See also

References

  1. doi:10.1306/C1EA5260-16C9-11D7-8645000102C1865D
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  2. doi:10.1130/0016-7606(1989)101<0663:GATSOT>2.3.CO;2
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  3. ^ The Times Atlas of the World, 1990, plate 19
  4. doi:10.1016/0040-1951(90)90416-6
    .
  5. doi:10.1093/petrology/32.3.455
    .
  6. doi:10.1016/0040-1951(88)90202-8
    .
  7. doi:10.1016/0012-821X(88)90066-0
    .
  8. doi:10.1130/0091-7613(1988)016<0073:REITSR>2.3.CO;2
    .
  9. S2CID 128408101
    .
  10. S2CID 140540795
    .

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