| Reference Type | Journal (article/letter/editorial) |
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| Title | Tracking magmatic processes through Zr/Hf ratios in rocks and Hf and Ti zoning in zircons: An example from the Spirit Mountain batholith, Nevada |
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| Journal | Mineralogical Magazine |
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| Authors | Lowery Claiborne, L. | Author |
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| Miller, C. F. | Author |
| Walker, B. A. | Author |
| Wooden, J. L. | Author |
| Mazdab, F. K. | Author |
| Bea, F. | Author |
| Year | 2006 (October) | Volume | 70 |
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| Issue | 5 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/0026461067050348Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 243719 | Long-form Identifier | mindat:1:5:243719:8 |
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| GUID | 0 |
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| Full Reference | Lowery Claiborne, L., Miller, C. F., Walker, B. A., Wooden, J. L., Mazdab, F. K., Bea, F. (2006) Tracking magmatic processes through Zr/Hf ratios in rocks and Hf and Ti zoning in zircons: An example from the Spirit Mountain batholith, Nevada. Mineralogical Magazine, 70 (5) 517-543 doi:10.1180/0026461067050348 |
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| Plain Text | Lowery Claiborne, L., Miller, C. F., Walker, B. A., Wooden, J. L., Mazdab, F. K., Bea, F. (2006) Tracking magmatic processes through Zr/Hf ratios in rocks and Hf and Ti zoning in zircons: An example from the Spirit Mountain batholith, Nevada. Mineralogical Magazine, 70 (5) 517-543 doi:10.1180/0026461067050348 |
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| Abstract/Notes | AbstractZirconium and Hf are nearly identical geochemically, and therefore most of the crust maintains near-chondritic Zr/Hf ratios of ∼35–40. By contrast, many high-silica rhyolites and granites have anomalously low Zr/Hf (15–30). As zircon is the primary reservoir for both Zr and Hf and preferentially incorporates Zr, crystallization of zircon controls Zr/Hf, imprinting low Zr/Hf on coexisting melt. Thus, low Zr/Hf is a unique fingerprint of effective magmatic fractionation in the crust. Age and compositional zonation in zircons themselves provide a record of the thermal and compositional histories of magmatic systems. High Hf (low Zr/Hf) in zircon zones demonstrates growth from fractionated melt, and Ti provides an estimate of temperature of crystallization (TTiZ) (Watson and Harrison, 2005). Whole-rock Zr/Hf and zircon zonation in the Spirit Mountain batholith, Nevada, document repeated fractionation and thermal fluctuations. Ratios of Zr/Hf are ∼307–40 for cumulates and 18–30 for high-SiO2 granites. In zircons, Hf (and U) are inversely correlated with Ti, and concentrations indicate large fluctuations in melt composition and TTiZ (>100°C) for individual zircons. Such variations are consistent with field relations and ion-probe zircon geochronology that indicate a >1 million year history of repeated replenishment, fractionation, and extraction of melt from crystal mush to form the low Zr/Hf high-SiO2 zone. |
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