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2013•Journal of Guilin University of TechnologyRequires access

REE Geochemistry of Mengya’a Lead-Zinc Deposit in Tibet

YE Yong-qin

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Abstract

Mengya’a lead-zinc deposit in Tibet,located in Nyainqentanglha metallogenic(retro-arc depressions and uplifts) sub belt of south Gangdise-Nyainqentanglha metallogenic belt is a significant and typical skarn ore deposit.Based on ore deposit geology,and study REE(rare earth elements) geochemistry,researches manifest that the metal sulphides of ores are low ΣREE(average is 31.03 × 10-6),and the LREE-enriched type;the LREE / HREE is 8.07-16.14;the δCe is 0.94-1.19(average is 1.06);the δEu is 0.45-0.76(average is 0.56).The REE distribution patterns of the metal sulphides from ores are quite similar to that from Laigu Formation,rich in LREE and depleted in HREE.The curve is obvious right-dipping type.Eu negative anomalies and Ce flat type manifest that this deposit has certain genetic relationship with Laigu Formation in the source of ore-forming materials.Laigu Formation may provide ore-forming information for Mengya’a deposit.

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Mengya’a lead-zinc deposit in Tibet,located in Nyainqentanglha metallogenic(retro-arc depressions and uplifts) sub belt of south Gangdise-Nyainqentanglha metallogenic belt is a significant and typical skarn ore deposit.Based on ore deposit geology,and study REE(rare earth elements) geochemistry,researches manifest that the metal sulphides of ores are low ΣREE(average is 31.03 × 10-6),and the LREE-enriched type;the LREE / HREE is 8.07-16.14;the δCe is 0.94-1.19(average is 1.06);the δEu is 0.45-0.76(average is 0.56).The REE distribution patterns of the metal sulphides from ores are quite similar to that from Laigu Formation,rich in LREE and depleted in HREE.The curve is obvious right-dipping type.Eu negative anomalies and Ce flat type manifest that this deposit has certain genetic relationship with Laigu Formation in the source of ore-forming materials.Laigu Formation may provide ore-forming information for Mengya’a deposit.

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Available abstract

Mengya’a lead-zinc deposit in Tibet,located in Nyainqentanglha metallogenic(retro-arc depressions and uplifts) sub belt of south Gangdise-Nyainqentanglha metallogenic belt is a significant and typical skarn ore deposit.Based on ore deposit geology,and study REE(rare earth elements) geochemistry,researches manifest that the metal sulphides of ores are low ΣREE(average is 31.03 × 10-6),and the LREE-enriched type;the LREE / HREE is 8.07-16.14;the δCe is 0.94-1.19(average is 1.06);the δEu is 0.45-0.76(average is 0.56).The REE distribution patterns of the metal sulphides from ores are quite similar to that from Laigu Formation,rich in LREE and depleted in HREE.The curve is obvious right-dipping type.Eu negative anomalies and Ce flat type manifest that this deposit has certain genetic relationship with Laigu Formation in the source of ore-forming materials.Laigu Formation may provide ore-forming information for Mengya’a deposit.

Key concepts: Skarn, Geology, Geochemistry, Mineralization (soil science), Ore genesis, Quartz, Soil water, Paleontology

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