Geochronology and Lu-Hf isotope of Early Paleozoic Zhuya-Shiban gabbros in Yunkai terrane, South China

ZHOU Dai; LONG Wenguo; WANG Lei; JIA Xiaohui

2017 Vol. 36, No. 5

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ZHOU Dai, LONG Wenguo, WANG Lei, JIA Xiaohui. Geochronology and Lu-Hf isotope of Early Paleozoic Zhuya-Shiban gabbros in Yunkai terrane, South China[J]. Geological Bulletin of China, 2017, 36(5): 726-737.

Citation:

ZHOU Dai, LONG Wenguo, WANG Lei, JIA Xiaohui. Geochronology and Lu-Hf isotope of Early Paleozoic Zhuya-Shiban gabbros in Yunkai terrane, South China[J]. Geological Bulletin of China, 2017, 36(5): 726-737.

Geochronology and Lu-Hf isotope of Early Paleozoic Zhuya-Shiban gabbros in Yunkai terrane, South China

1.
Wuhan Center of Geology Survey, CGS, Wuhan 430205, Hubei, China
2.
Research Center of Granitic Diagenesis and Mineralization, CGS, Wuhan 430205, Hubei, China

Received Date: 25 July 2016

Revised Date: 07 March 2017

Publish Date: 25 May 2017

Abstract

Abstract

Early Paleozoic mafic intrusive rocks in Yunkai terrane commonly occur as small stocks that intruded into pre-Cambrian strata and/or contemporary gneissic granite, with main rock types being gabbro and norite gabbro.The gabbros in Zhuya and Yunlu yielded ²⁰⁶Pb/²³⁸U weighted age of ca.445Ma.The gabbros show relatively high MgO, CaO, low TiO₂ content, very low ∑REE (20.8×10^-6~26.6×10^-6), weak enrichment of LREE and strong depletion of HFSE (Nb-Zr-Ti-P).Zircons give negative ε_Hf(t) and T_DM model ages from 1.1Ga to 1.4Ga, showing the features of an enriched mantle source.Tectonic setting analysis shows that the gab-bors acted like volcanic arc rocks.Previous studies show many Early Paleozoic mafic rocks in Cathaysia Block with characteristic fin-gerprints of arc volcanic rock features, and hence the Early Paleozoic geotectonic evolution history in Yunkai terrane (even Cathaysia Block) should be reconsidered.
- gabbro /
- arc volcanic rock /
- Early Paleozoic /
- zircon U-Pb dating /
- Yunkai terrane

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References

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