Partition coefficients of Hf, Zr, and ree between phenocrysts and groundmasses

American Geophysical Union (AGU) - Tập 89 Số S02 - 1984
Haruyuki Fujimaki1, M. Tatsumoto2, Kenichiro Aoki3
1U.S. Geological Survey, Denver; Colorado School of Mines, Golden CO, United States
2U.S. Geological Survey, Denver, CO, United States
3Tohoku University Sendai, Japan#TAB#

Tóm tắt

Partition coefficients of Hf, Zr, and REE between olivine, orthopyroxene, clinopyroxene, plagioclase, garnet, amphibole, ilmenite, phlogopite, and liquid are presented. Samples consist of megacrysts in kimberlite, phenocrysts in alkaline basalts, tholeiitic basalts and andesitic to dacitic rocks, and synthetic garnet and clinopyroxene in Hawaiian tholeiites. The Hf‐Lu and Zr‐Lu elemental fractionations are as large as the Lu‐Sm or Lu‐Nd fractionation. The Hf and Zr partition coefficients between mafic phenocrysts and liquids are smaller than the Lu partition coefficients, but are similar to the Nd or Sm partition coefficients. The Hf and Zr partition coefficients between ilmenite, phlogopite, and liquid are larger than the Lu partition coefficients for these minerals and their corresponding liquids. The Hf‐Zr elemental fractionation does not occur except for extreme fractionation involving Zr‐minerals and extremely low fo2. These data have an important bearing on chronological and petrogenetic tracer studies involving the Lu‐Hf isotopic system.

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American Geophysical Union (AGU)

Tập 89 Số S02

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