The crustal evolution of continental Taiwan

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Authors:Lan, Ching-Ying; Chen, Chang-Hwa; Chen, Chen-Hong; Chung, Sun-Lin; Lee, Typhoon; Lee, Chih-Ming Wang; Yui, Tzen-Fu
Author Affiliations:Primary:
Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan
Other:
National Taiwan University, Taiwan
Volume Title:Journal of the Geological Society of China
Source:Journal of the Geological Society of China, 39(3), p.337-353. Publisher: Geological Society of China, Taipei, Taiwan. ISSN: 1018-7057
Publication Date:1996
Note:In English. 79 refs.; illus., incl. sects., sketch map
Summary:The combined information provided from isotopic data and geotectonic history is summarized. The inherited ages of zircons (2100-1000 m.y.) in the granitic rocks of the Tananao metamorphic basement complex and the Nd model ages (2000-900 m.y.) of the Phanerozoic rocks suggest that the bulk of the protoliths for the Taiwan Phanerozoic rocks originally separated from a depleted mantle reservoir in the middle Proterozoic era. During the late Palaeozoic to early Mesozoic, continental Taiwan served as marginal basins filled with clastic sediments. The first tectonothermal event began at 250 ± 50 m.y. Four episodes of mantle input can be identified since then: 1) the early Mesozoic event (200-175 m.y.) in the metapelites of the Tananao metamorphic complex, 2) the late Mesozoic event (97-77 m.y.) in the granitic rocks of the Tananao basement complex, 3) the Cainozoic event (37-8 m.y.) in the intraplate basalts of the W foothills of Taiwan and 4) the ongoing (3 m.y. to present day) event in the volcanic rocks of N Taiwan. The possible causes of these four events are outlined. As a consequence of arc-continent collision, the fourth event may be attributed to the change from a compressional to a dilational tectonic regime in the N Taiwan orogen during the late Tertiary to Quaternary, rather than being related directly to the Ryukyu subduction zone magmatism. [R.A.H.]
Subjects:Accretionary wedges; Basement tectonics; Cenozoic; Continental crust; Continental margin; Crust; Mesozoic; Metamorphic rocks; Metapelite; Metasedimentary rocks; Paleozoic; Polyphase processes; Tectonics; Asia; Far East; Taiwan; Tananao Complex
Coordinates:N220000 N253000 E1220000 E1191500
Abstract Numbers:98M/800
Record ID:2000044745
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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