Abstract
An Experimental Petrological Study of Gabbro in Chintan, Taipei County, at Atmospheric Pressure
Highlights
Chintan is located in the south of Sindian city, Taipei County, near the boundary of the Taipei basin and the Western foothills of Taiwan
The fractional crystallization of the gabbroic melt at atmospheric pressure is controlled by iron-titanium oxides, plagioclase, chromite, and pyroxene
Melting experimental techniques at atmospheric pressure were the same as that reported by Liu et al (1997)
Summary
Chintan is located in the south of Sindian city, Taipei County, near the boundary of the Taipei basin and the Western foothills of Taiwan. Fragmentary volcanic activities occurred in the Neogene Period The eruption of these volcanics cut across Tertiary sedimentary strata and formed as basaltic rocks in western Taiwan. These igneous rocks often occurred with graben topography (Sun 1982). Ichimura (1929) first proposed the term “alkali syenites” and reported that the alkali syenites occurred as a dike or sill in the Chintan area (Ichimura 1943; Yen 1954). The teschenite crystallized from original magma in the base; the syenite groups represent residual melt. These residual melts segregated alkali feldspar syenite and microsyenite by mineral segregation. The fractional crystallization trend of the gabbroic melt will be discussed
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