台灣地震地質研究－台灣西南部活斷層研究─利用土壤氣地球化學方法探勘台灣西南部地表下斷層可能分佈
Other Title
Recognition of buried fault by geochemical method - soil gases investigations in
southwestern Taiwan
southwestern Taiwan
Date Issued
2004
Date
2004
Author(s)
楊燦堯
DOI
922116M002003
Abstract
Taiwan is located on the boundary between
Eurasia plate and Philippine Sea plate. The
on-going collision between these two plates makes
Taiwan densely faulted. So far most of the
researches for the active faults in Taiwan are based
on geophysical techniques, trench studies and
structure geology, and geochemical methods are
rarely used. In this work, the soil-gas
compositions are measured and synthesized to
compare with the geological, geophysical and
geomorphological information along the
Chao-chou Fault, which is considered as an active
fault in southern Taiwan.
The geochemical method using soil gases is
based on the principle that faults and/or fractures
are conduits which may provide high permeability
pathways for deep source gases migrating upward
to the surface, and that deep crust or mantle can
produce anomalously high deep source signatures
for some gases that are distinctive from those
already existed in the overlying soils. Through
this method, data can be collected rapidly with low
cost. Preliminary results show that helium and
carbon dioxide concentrations in the soil gas reveal
anomalous values for specific positions along each
of the transverses to the Chao-chou Fault. It indicates that the N-S trending, geochemically
anomalous lineation corresponds to the reported
trend and pattern of the Chao-chou Fault.
Besides, several N-S trending fractural structures
distributed in this area are also suggested.
Subjects
soil gas
Chao-chou fault
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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