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This monograph contains over fifty high-quality plates of electron
micrographs of limestones. It spans the field of limestones in age
from Cambrian to Recent, and in type from deep-sea oozes to
intertidal rocks. It represents the outcome of four years of
research in the new field of electron microscopy applied to rocks.
The illustrations show the spectacular results and much more is
revealed in fossils and textures than would be expected on the
basis of optical studies. Originally published in 1967. The
Princeton Legacy Library uses the latest print-on-demand technology
to again make available previously out-of-print books from the
distinguished backlist of Princeton University Press. These
editions preserve the original texts of these important books while
presenting them in durable paperback and hardcover editions. The
goal of the Princeton Legacy Library is to vastly increase access
to the rich scholarly heritage found in the thousands of books
published by Princeton University Press since its founding in 1905.
This monograph contains over fifty high-quality plates of electron
micrographs of limestones. It spans the field of limestones in age
from Cambrian to Recent, and in type from deep-sea oozes to
intertidal rocks. It represents the outcome of four years of
research in the new field of electron microscopy applied to rocks.
The illustrations show the spectacular results and much more is
revealed in fossils and textures than would be expected on the
basis of optical studies. Originally published in 1967. The
Princeton Legacy Library uses the latest print-on-demand technology
to again make available previously out-of-print books from the
distinguished backlist of Princeton University Press. These
editions preserve the original texts of these important books while
presenting them in durable paperback and hardcover editions. The
goal of the Princeton Legacy Library is to vastly increase access
to the rich scholarly heritage found in the thousands of books
published by Princeton University Press since its founding in 1905.
The Aksitero Formation of central Luzon is an upper Eocene and
lower Oligocene sequence of evenly bedded hemipelagic limestone
with a few thin interlayers of tuffaceous turbidites. The limestone
consists chiefly of planktonic foraminifers and calcareous
nannofossils, with up to 30 percent of noncarbonate components,
chiefly volcaniclastic debris. The tuff layers are graded beds.
Composed mainly of glass shards, pumice fragments, crystals, and
fine-grained volcanic rock fragments. Hydrocarbons migrated into
the pores of the tuffaceous layers early during diagenesis but they
were subsequently flushed out and only bitumen remains, chiefly as
thin coatings on grains and wthin pumice vesicles. Later during
diagenesis, zeolites (mordenite and c1inoptilolite) and secondary
calcite preferentially replaced glass shards and pumice fragments.
Deposition of the Aksitero Formation probably occurred at depths of
at least 1,000 meters within a subsiding basin adjacent to an
active island arc system. Submarine ash eruptions of silicic
composition caused volcaniclastic turbidity currents that
occasionally reached the basin floor. The more proximal facies of
these volcaniclastic deposits may be prospective for hydrocarbons.
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