台灣西部第三系之層序地層學研究(II)
Other Title
Sequence Stratigraphic Analysis of the Tertiary Strata in Western Taiwan (2)
Date Issued
2000
Date
2000
Author(s)
DOI
892116M002013
Abstract
In western Taiwan, Tertiary strata are widely
outcropped in the Hsueshan Range and Western
Foothills, and distributed in the subsurface geology of
the Coastal Plain and Taiwan Strait. They were
deposited in a coastal to shallow shelf environment.
According to the results of the first-year
research in 3 outcrop sections and 3 electric well logs,
the facies and thickness of the Oligocene and Lower
Miocene strata drastically deepen and thicken
eastwards, respectively. Eight depositional sequences
are identified in these offshore-dominated facies
successions. The Middle and Upper Miocene strata are
likewise dominated by the offshore deposits and
further characterized by the coastal plain and
nearshore deposits. Their lateral facies changes are
more consistent and widely observed both southwards
and eastwards. Ten depositional sequences are
identified in the faices successions. In central Taiwan,
missing of some of the Upper Miocene sequences are
discovered.
During this year, the stratigraphic records of
the Chuhuangkeng section and 2 well logs in
northwestern Taiwan have been investigated to
examine the vadility of the sequence stratigraphic
scheme established in the previous year. The
Oligocene sequences are not completely reocrded in
these sections, because they are usually deep-seated in
the subsurface geology or discontinuously outcropped.
This is due to the drastic thickness increase of the
Tertiary strata in this area. Nevertheless, the Miocene
sequecnes are still distinguishable with similar facies
and sequence characteristics. Twelve depositional
sequences are identified and comparable to those
discovered in the first year.
Based on the researches in the past two years, it
is believed that the new-established sequence
stratigraphic scheme is successfully examined and
found appliciable. These interesting findings call for
further studies on more stratigraphic sections,
quantitative depositional depth evaluation and sealevel
reconstruction. These advancesd analyses are helpful
to improve the sequence stratigraphic scheme with the
details of straitgraphic division, application and
geohistory reconstruction.
Subjects
Western Taiwan
Tertiary
Sequence
Stratigraphy
Stratigraphy
Oligocene- Lower Miocene
Middle and Upper Miocene
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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