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Circum-Pacific and Caribbean Orogens |
Geological Survey of Taiwan, P.O. Box 31, Taipei, Taiwan, China
The Taiwan orogen lies between the Philippine Sea Basin and the Asian mainland and is the link between the Ryukyu island arc to the north and the Philippine orogen to the south. In contrast to the adjacent island archipelagoes, the large island of Taiwan yields a clear geographical arrangement of zones and a detailed history of Neogene to Recent orogenic activity.
Segment: the width of the orogenic belt on Taiwan, taken from the margin against foreland in the west to the east coast of the island, varies up to 100 to 140 km. The length of the segment chosen is 100 km. The western margin of the belt is exposed and varies from sharply defined (<
Zones: the Taiwan orogen is described here in terms of four zones. The Foothill zone (1) contains thick Miocene to Pleistocene clastic sediments, little deformed in the west but affected by west-directed thrusts and folds in the east. In the Central Range (zone 2), Cretaceous to Miocene clastic strata overlie late Palaeozoic metamorphic basement; folding, thrusting and very low grade metamorphism occurred in Neogene times. The Rift Valley and Coastal Range (zone 3) contains Miocene andesitic volcanics and thick Pliocene clastics, both allochthonous on Pleistocene clastic
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This 250-word extract was created in the absence of an abstract.
km) to narrowly gradational ( to 3 km wide). The eastern margin is submarine and unknown. The author suggests, however, that the submarine upthrust likely to exist immediately east of the Volcanic Inner Arc (Fig. 1, fault H) may be the inner margin of the orogenic belt.
