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Chemistry of Hf-rich zircons from the Laoshan I- and A-type granites, eastern China

R. C. Wang, G. T. Zhao, J. J. Lu, X. M. Chen, S. J. Xu and D. Z. Wang
Chemistry of Hf-rich zircons from the Laoshan I- and A-type granites, eastern China
Mineralogical Magazine (October 2000) 64 (5(426)): 867-877

Abstract

Zircon commonly occurs as one of important accessory HFSE-bearing minerals in A-type granite. A detailed electron microprobe study was carried out on zircon from the Laoshan complex, Eastern China, which is composed of I- and A-type granites. Zircon from the I-type rocks is relatively poor in trace elements (HfO (sub 2) <2 wt.%, UO (sub 2) , ThO (sub 2) and Y (sub 2) O (sub 3) <1 wt.%), but that from the A-type rocks is richer in Hf, U, Th and Y. Hafnian zircon with a HfO (sub 2) content of up to 12.37 wt.% was found in the arfvedsonite granite, which is considered the most evolved facies in the A-type suite. Enrichment in Hf is generally observed at the rims of zircon crystals relative to the cores. The Hf enrichment in zircon, and the association of exotic REE- and HFSE-bearing minerals are linked to hydrothermal activity, suggesting that during the last stage of crystallization of the A-type magma, fluids enriched in REE, HFSE, F (super -) , CO (super 3-) (sub 2) and PO (sub 4) (super 3-) were released.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 64
Serial Issue: 5(426)
Title: Chemistry of Hf-rich zircons from the Laoshan I- and A-type granites, eastern China
Affiliation: Nanjing University, Department of Earth Sciences, Nanijing, China
Pages: 867-877
Published: 200010
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 20
Accession Number: 2001-000750
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N36°06'00" - N36°06'00", E120°22'00" - E120°22'00"
Secondary Affiliation: Qingdao Ocean University, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200101
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