Ilocos-Central Luzon Basin
Ilocos-Central Luzon Basin is a sedimentary basin and stratigraphic formation in the Ilocos Region and Central Luzon Region, Philippines.[1] It is one of the 16 major sedimentary basins in the country and stretches from the vicinity of the Manila metropolitan area in the south to Ilocos Norte in the north.[2]
The basin is filled with sedimentary rocks that range in age from Late Oligocene to Pliocene.[3] These rocks were deposited in a variety of environments, including deep marine, shallow marine, and non-marine settings. The basin is also home to a number of hydrocarbon reservoirs, which are currently being explored for oil and gas potential.
Stratigraphic groupings[edit]
Ilocos[edit]
- Suyo Schist - greenschist, serpentinite, chert
- Ilocos Peridotite - serpentinized peridotite
- Bangui Formation - sandstone, conglomerate, mudstone; includes olistostrome
- Magabobbo Limestone - micritic limestone, calcarenites, minor argillites
- Bojeador Formation - conglomerate, graywacke, shale, limestone and associated volcanic flows and pyroclastics
- Pasaleng Quartz Diorite
- Dagot Limestone - reefal limestone, calcarenites, biosparites, minor calcareous volcanic conglomerate, particularly at the base and middle section
- Batac Formation - thinly bedded sandstone and shale; conglomerate
- Pasuquin Limestone - limestone with minor calcareous conglomerate, calcirudite, calcarenite
- Uplifted Coral Reefs
Luzon Central Valley[edit]
West side[edit]
- Aksitero Formation - Lower Bigbiga Limestone – micritic limestone with tuffaceous turbidites and minor chert; Upper Burgos Member – Limestone, tuffaceous sandstone, siltstone and mudstone. This is coequival with Bigbiga Limestone.
- Moriones Formation - interbedded sandstone, shale, conglomerate with minor limestone; identified members are Sansotero Limestone and Malo Pungatan Limestone
- Malinta Formation - Lower Pau Sandstone – sandstones with minor tuffaceous shale, conglomerates and lapilli tuff; Upper Aparri Gorge Sandstone – sandstones with shale stringers and conglomerate lenses
- Tarlac Formation - interbedded sandstone, shale, conglomerate
- Amlang Formation - turbiditic sandstones and shale with minor conglomerates
- Cataguintingan Formation - mainly tuffaceous sandstones, with interbeds of siltstones, shales and conglomerate and minor limestone lenses
- Bamban Formation - tuffaceous sandstone and lapilli tuff with basal conglomerate.
- Damortis Formation - sandstone, calcarenite, siltstone, limestone and marl
East side[edit]
- Barenas-Baito Formation
- Bayabas Formation
- Angat Formation
- Madlum Formation
- Makapilapil Formation
- Lambak Formation
- Tartaro Formation
- Guadalupe Formation
See also[edit]
List of stratigraphic formations in the Philippines
References[edit]
- ^ Lexicon of Philippine Stratigraphy, Rolando Peña, 2008
- ^ https://www.researchgate.net/figure/Ophiolites-and-ophiolitic-rocks-found-in-different-parts-of-the-Philippine-archipelago_fig2_226705935#:~:text=2013).,Discussion%20Faunal%20remarks.%20...
- ^ https://www.researchgate.net/figure/A-Map-of-the-Luzon-Island-showing-major-structures-and-the-location-of-the_fig1_322976452#:~:text=The%20basin%20is%20one%20of,%2C%201978).%20...&text=...,-lithologic%20homogeneity%20rather