Mineralogy and geochemistry of granitic rocks from Chinmen, Liehyu and Dadan islands, Fujian

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Authors:Lan, Ching-Ying; Chung, Sun-Lin; Mertzman, Stanley A.
Author Affiliations:Primary:
Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Other:
National Taiwan University, Taiwan
Franklin and Marshall College, United States
Volume Title:Lithosphere evolution of Southeast China
Volume Authors:Lo, C. H., editor; Chung, S. L.
Source:Lithosphere evolution of Southeast China, edited by C. H. Lo and S. L. Chung. Journal of the Geological Society of China, 40(3), p.527-558. Publisher: Geological Society of China, Taipei, Taiwan. ISSN: 1018-7057
Publication Date:1997
Note:In English with Chinese summary. 64 refs.; illus., incl. 7 tables, geol. sketch map
Summary:Granitic rocks with granite, monzonite, granodiorite, trondhjemite and tonalite compositions, from Chinmen, Liehyu and Dadan islands, were emplaced at 139.4 ± 0.4 and 100 ± 0.5 m.y., corresponding with the first and third episodes, respectively, of late Yanshanian magmatism in SE China. They have quartz, K-feldspar (Or87-97), plagioclase (An11-40), biotite, muscovite and calcic amphibole (ferro-pargasite to ferro-hornblende) mineralogy, are commonly peraluminous (A/CNK > 1.0 and normative corundum > 1%), and have moderately fractionated LREE patterns with negative Eu anomalies. In the primitive mantle-normalized trace-element diagram they show a significant Nb depletion similar to those of magmatic rocks from subduction zones, and plot in the volcanic arc field on tectonic discrimination diagrams. Overall, they have high-K calc-alkaline to shoshonitic geochemical signatures typical of I-type granites from a post-orogenic tectonic environment in the SE China continental margin, and are considered genetically different from late Cretaceous granitic rocks in east-central Taiwan, which likely resulted from a convergent-margin setting. [J.F.]
Sections:Geochemistry
Subsections:Igneous rocks
Subjects:Chemical composition; Concentration; Cretaceous; Dikes; Electron probe data; Gneisses; Granites; Igneous rocks; Intrusions; Jurassic; Magmatism; Mesozoic; Metals; Metamorphic rocks; Mineral composition; Plutonic rocks; Rare earths; Spectra; Subduction zones; Tectonics; Trace elements; Upper Jurassic; X-ray fluorescence spectra; Yanshanian; Asia; China; Far East; Fujian China; Chinmen Island; Dadan Island; Liehyu Island
Coordinates:N242000 N244000 E1183000 E1180000
Abstract Numbers:99M/1739
Record ID:1998026084
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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