Geochemical Characteristics, UHP Metamorphic Age, and Genesis of the Hujialing Garnet Clinopyroxenite, Sulu Terrane, China
Authors:
- 1 January 2008
- journal article
- Published by Taylor & Francis in International Geology Review
- Vol. 50 (1) , 48-60
Abstract
The bulk composition of the Hujialing garnet clinopyroxenite from Rizhao, Sulu ultrahighpressure (UHP) metamorphic belt, is rich in fertile and low in refractory elements compared with primary mantle. This composition is characterized by high MgO (12.77-18.73 wt%) and CaO/Al2O3 (1.6-8.0), and low alkali and Mg# (74.8-86.1), suggesting that the rock has an affinity to aluminadepleted komatiite. The REE pattern resembles that of clinopyroxene with relative HREE depletion of (Gd/Yb)N = 3.51-5.87. The PGE concentrations lie in the range of 19.18-59.44 ppb, higher than that of mantle xenolith and Alpine type peridotites, with (Pd/Ir)N of 8.58-11.07. These chemical data indicate that the magma that recrystallized as garnet clinopyroxenite was formed mainly by melting of clinopyroxene from a mantle source containing residual garnet. The high concentration and positive correlation between PGE abundances and atomic number show that their distribution was controlled by a high degree of partial melting in the absenc...Keywords
This publication has 29 references indexed in Scilit:
- Exhumation of ultrahigh‐pressure continental crust in east central China: Late Triassic‐Early Jurassic tectonic unroofingJournal of Geophysical Research, 2000
- Differentiation of platinum-group elements (PGE) and of gold during partial melting of peridotites in the lherzolitic massifs of the Betico-Rifean range (Ronda and Beni Bousera)Chemical Geology, 1996
- Petrology of the Hujialin garnet clinopyroxenite in the Su‐Lu ultrahigh‐pressure province, eastern ChinaIsland Arc, 1995
- Correction to “Constraints on melt migration from mantle plumes: A trace element study of peridotite xenoliths from Savai'i, Western Samoa” by Erik H. Hauri and Stanley R. HartJournal of Geophysical Research, 1995
- Depth and degree of melting of komatiitesJournal of Geophysical Research, 1992
- Zircon U-Pb ages for the Early Cambrian time-scaleJournal of the Geological Society, 1992
- Partitioning of platinum-group elements in the Fe-Ni-S system and their fractionation in natureGeochimica et Cosmochimica Acta, 1991
- The origin of the fractionation of platinum-group elements in terrestrial magmasChemical Geology, 1985
- Quantitative models of trace element behavior in magmatic processesEarth and Planetary Science Letters, 1978
- Ultrabasic magmas and high-degree melting of the mantleContributions to Mineralogy and Petrology, 1977