Kainangang Fm
Type Locality and Naming
The type section is located at Kainangang (now known as Heren) to the north of Hualian County, Taiwan. It was named by the Gu Cangbo in 1954.
Synonym: Kainangang Bed
Lithology and Thickness
Metamorphic. Gneiss with a well-developed gneissic structure in the form of a coarse-grained gneissic structure, consisting mainly of quartz, biotite and plagioclase, comprising as well as muscovite, chlorite, epidote, garnet and amphibole.
Relationships and Distribution
Lower contact
Unknown. Fault contact with all the surrounding strata
Upper contact
Unknown. Fault contact with all the surrounding strata
Regional extent
GeoJSON
Fossils
Age
Depositional setting
Additional Information
In accordance with the study on the gneiss exposed in the Tailuge belt in the northern part of the metamorphic complex conducted by Wang Zhiming (1991), the gneiss has undergone three stages of metamorphism. The metamorphism of the first stage is hard to be recognized because of the influence of the later-stage processes, and only the nuclei of the porphyroblasts could be inferred to be remanent minerals of the first-stage metamorphism, and judging by the content of calcium in the remanent plagioclase and by the inner nucleus of zonal amphibole the temperature of metamorphism should be of about 500°C and the pressure should be of (1000～3000)×10 Pa. It is inferred by the mineral association that for the second-stage metamorphism its temperature range should be of 630～725°C, and its pressure should be of (3500～7300)×10 Pa, and under such a pressure the temperature of metamorphism should be of 480°C in accordance with the inference of the composition of Kieselmuscovite.