LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance

HUANG Changhuang

2017 Vol. 36, No. 10

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HUANG Changhuang. LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance[J]. Geological Bulletin of China, 2017, 36(10): 1740-1749.

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HUANG Changhuang. LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance[J]. Geological Bulletin of China, 2017, 36(10): 1740-1749.

LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance

HUANG Changhuang

Fujian Institute of Geological Survey, Fuzhou 350013, Fujian, China

Received Date: 20 June 2016

Revised Date: 21 March 2017

Publish Date: 25 October 2017

Abstract

Abstract

Yuantoushan is located in the north of Tailuko belt, eastern Taiwan. It is mainly composed of strongly deformed and metamorphosed granodiorite-gabbro "slurry mixed rock" combination. Deformed intrusions are in the center and show typical magmatic features, representing magmatic events after deformation and metamorphism. The authors carried out field geological survey and petrologic as well as isotopic geochronologic studies of metamorphic intrusive rocks and intrusive rocks. It is shown that there are significant differences in rock characteristics and main trace elements between the two kinds of rocks, indicating that the two kinds of rocks are products of different tectonic magmatic events. Undeformed intrusive rock is quartz diorite, with high Pb, Rb, U, Th, Zr, exhibiting mild enrichment characteristics of I type granite, and its LA-ICP-MS zircon U-Pb isotopic age is 82 ±1Ma, suggesting the Late Cretaceous Campanian period. This indicates that the deformation and metamorphism event in eastern Taiwan were ended, and the evolution then entered a non-squeezing neotectonic stage.
- eastern Taiwan /
- undeformed quartz diorite /
- LA-ICP-MS zircon U-Pb dating /
- Late Cretaceous Campanian perio

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References

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