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J4 ›› 2010, Vol. 16 ›› Issue (4): 426-435.

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Characteristics of Granitic Pegmatite with High-Purity Quartz in Spruce Pine   Region, USA and Altay Region of Xinjiang, China

ZHANG Ye ,  CHEN Pei-rong   

  1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering,   Nanjing University, Nanjing 210093, China
  • Received:2010-03-25 Revised:2010-10-08 Online:2010-12-20 Published:2010-12-20


The alaskites/pegmatites from the Spruce Pine region of USA and the muscovite granites/pegmatites from the Altay region of Xinjiang, China, were comparatively studied. The pegmatites from both regions might be melt-vapor differentiation products of the peraluminous granitic magmas. The pegmatites from the Spruce Pine region with high-purity quartz were developed on the schist or gneiss background, whose major rock-forming minerals are rich in plagioclase, showing high Na/K ratios, high large-ion lithophile elements Sr and Ba contents, low high-field strength and rare earth elements contents, positive Eu anomalies,and low impurity elements contents in quartz. All these characteristics can be used as the discrimination criteria of high-purity quartz pegmatities. The Altay region of Xinjiang is abundant of pegmatites, and some samples studied showed the features which evidenced that the Altay pegmatite region has a perspective to find the gualified pegmatites with high-purity quartz.

Key words: pegmatite, high-purtity quartz, Spruce Pine, Altay

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