Zircon U-Pb Dating and Hf Isotopic Compositions of Porphyrites from
the Ningwu Basin and Their Geological Implications

Abstract

Abstract:

Ningwu volcanic basin is one of the most important basins related to mineral deposits in middle-lower reaches of the
Yangtze River belt. Four volcanic units occur in the basin, in an ascending order, the Longwangshan Formation, the Dawangshan
Formation, the Gushan Foramtion and the Niangniangshan Formation, with some high-level sub-volcanic igneous rocks intruding
them. Detailed zircon U-Pb dating and Hf isotopic composition measurement were performed on the host rocks (gabbro-diorite
porphyrites) of the Washan iron deposit. The zircon U-Pb ages of three samples are (123±1) Ma, (127±3) Ma and (125±2)
Ma, respectively.Together with previously published precise zircon U-Pb dating results for volcanic rocks (127 to 131Ma), these
results have placed a better constraint on the magmatic and mineralization activity duration of the Ningwu volcanic basin. The
zircons from the Ningwu porphyrites have εHf
( t ) values from -6.3 to -8.6. Together with other available geochemical data, the
Hf isotope data indicate that the Ningwu porphyrites may have derived from upwelling depleted asthenospheric mantle mixed
with enriched mantle and crust, which was controlled by the extensive lithosphere extension at around 125 Ma. The lower εHf(t)
values and slightly younger ages of the gabbro-diorite porphyrites than their hosting volcanic rocks may indicate more crust
material involvement in the porphyrite petrogenesis.

Key words: :Ningwu volcanic basin, grabbro-diorite porphyrite, zircon U-Pb age, Hf isotopes

CLC Number:

HU Jin-ping, JIANG Shao-yong. Zircon U-Pb Dating and Hf Isotopic Compositions of Porphyrites from
the Ningwu Basin and Their Geological Implications[J]. J4, 2010, 16(3): 294-308.

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