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Earlier Geologic Maps of Taiwan
Geographic Setting
General Geology And Geologic Provinces Of Taiwan
Explanation Of Legend And Representation Of Geologic Data
Eastern Central Range
Western Central Range Backbone Ridges
Western Foothills
Eastern Coastal Range
Geology Of The Hengchun Peninsula
Major Geologic Features Of Taiwan
Plate Tectonic Setting

:::Eastern Central Range
Introduction Occurrence and Lithology of Metamorphic Rocks Stratigraphy and Geologic Ages Radiometric Ages Metamorphic Belts Structural Features and Orogenic Events Metamorphic Events and Tectonic Evolution
The pre-Tertiary metamorphic complex is exposed mainly in the eastern part of the Central Range and constitutes the eastern subprovince of the Central Range geologic province. It forms the oldest geologic element of Taiwan. The metamorphic belt is exposed over a north-south length of 250 kilometers and maximum width of 30 kilometers in the north. The width, of the belt diminishes to 20 kilometers in the middle part and to 10 kilometers in the south at Taitung. This belt covers approximately 4,600 square kilometers and underlies about 14 percent of the land area of Taiwan. The metamorphic rocks in the complex are represented by an assemblage of metasedimentary and metavolcanic rocks composed largely of schists and metamorphosed limestone. Subordinate amounts of gneisses, migmatite, amphibolite, serpentinite, and mafic to ultramafic igneous rocks are also found in the metamorphic rocks. Various kinds of dikes and quartz veins are scattered in the schistose, gneissic and other rocks. All these rocks are grouped on the legend under the general stratigraphic term "Tananao Schist." Three varieties, black or pelitic schist, greenschist, and siliceous schist, are by far the dominant rock types in this belt (Yen, 1954a). The metamorphic terrain is heavily forested, and marked by precipitous mountains and rugged topography. The whole area is scarcely populated and accessibility is difficult. Detailed geologic mapping is extremely laborious if not impossible.
Most parts of this metamorphic province have been studied only in reconnaissance, with very little systematic detailed mapping. Critical geologic information is still lacking for much of this province, except locally accessible areas that are close to the coast, or to main highways, or to the Longitudinal Valley. In areas where mining or logging are taking place, more detailed geologic study has been undertaken to evaluate mining and development potentials. These areas include the Suao-Nanao area in northeastern Taiwan, the Tailuko drainage near Hualien, the Fengtien-Wangyung-Juisui area south of Hualien, and Yuli in Hualien-hsien. In addition, the metamorphic rocks exposed along the three main cross-island highways have been studied in considerable detail for engineering and economic purposes. However, all these well-studied areas make up only a small portion of the immense metamorphic belt. More efforts to conduct extensive studies in other remote areas are required before we will be able to delineate the complex geologic and tectonic history of the entire metamorphic complex.

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Site visited : 0010994911 Last maintained : 2019-06-25