Econ. Environ. Geol. 2014; 47(2): 147-168

Published online April 30, 2014

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Geochemical Exploration for Tri Le REE Occurrence in Nghe An Province within Northern Vietnam

Chul-Ho Heo1*, Ho Tien Chung2 and Jae-Ho Lee1

1Mineral Resources Department, Mineral Resources Development Research Center, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources(KIGAM), Daejeon 305-350, Korea
2Vietnam Institute of Geosciences and Mineral Resources(VIGMR), Nguyen Trai Str., Thanh Xuan, Ha Noi, Vietnam

Correspondence to :

Chul-Ho Heo

chheo@kigam.re.kr

Received: January 23, 2014; Revised: April 7, 2014; Accepted: April 8, 2014

Abstract

The soil geochemical exploration was carried out targeting around Tri Le area far from about 30 km with northwestern direction from Que Phong within Nghe An province. The interval of sampling are horizontal 200 m interval with 23 line and longitudinal 300 m with 10 line, resulting in 228 soil samples. Based on the result of the soil geochemical exploration, the detailed pitting survey was carried out targeting the grid point with high TREO content, resulting in 75 soil samples within 7 pits. The geology of survey area are consisted of Ban Chieng biotite granite complex and granitic gneiss intruding Ban Khang formation comprising of quartz schist and marble. Main mineralization in the study area have the characteristics of occurrence with tin, ruby and REE-bearing monazite and xenotime to be thought as occurring at the alteration zone of granite complex. In order to elucidate the source rock of monazite and xenotime confirmed from heavy sand, soil geochemical exploration was carried out. As a analysis result with ICP-MS on the soil samples from the soil geochemical exploration, total REE oxide content of background amount to about 2 times of crustal abundance, enriching the heavy rare earth(about 2 times) and light rare earth(about 1.5 times). As a analysis result with ICP-MS on the soil samples from the soil detailed pit survey, we only identified outcrop considering as economic weathered granite body at the grid point 1-10 pit among 7 pits. As a synthetic consideration on the soil geochemical exploration and detailed pit survey, we tentatively designated Tri Le area as no promising target for REE. In 2014, we have the plan to carry out the soil geochemical exploration targeting the extended economic REE ore body in Quy Chau as project area from 2011 to 2012.

Keywords REE, Nghe An, Vietnam

Article

Econ. Environ. Geol. 2014; 47(2): 147-168

Published online April 30, 2014

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Geochemical Exploration for Tri Le REE Occurrence in Nghe An Province within Northern Vietnam

Chul-Ho Heo1*, Ho Tien Chung2 and Jae-Ho Lee1

1Mineral Resources Department, Mineral Resources Development Research Center, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources(KIGAM), Daejeon 305-350, Korea
2Vietnam Institute of Geosciences and Mineral Resources(VIGMR), Nguyen Trai Str., Thanh Xuan, Ha Noi, Vietnam

Correspondence to:

Chul-Ho Heo

chheo@kigam.re.kr

Received: January 23, 2014; Revised: April 7, 2014; Accepted: April 8, 2014

Abstract

The soil geochemical exploration was carried out targeting around Tri Le area far from about 30 km with northwestern direction from Que Phong within Nghe An province. The interval of sampling are horizontal 200 m interval with 23 line and longitudinal 300 m with 10 line, resulting in 228 soil samples. Based on the result of the soil geochemical exploration, the detailed pitting survey was carried out targeting the grid point with high TREO content, resulting in 75 soil samples within 7 pits. The geology of survey area are consisted of Ban Chieng biotite granite complex and granitic gneiss intruding Ban Khang formation comprising of quartz schist and marble. Main mineralization in the study area have the characteristics of occurrence with tin, ruby and REE-bearing monazite and xenotime to be thought as occurring at the alteration zone of granite complex. In order to elucidate the source rock of monazite and xenotime confirmed from heavy sand, soil geochemical exploration was carried out. As a analysis result with ICP-MS on the soil samples from the soil geochemical exploration, total REE oxide content of background amount to about 2 times of crustal abundance, enriching the heavy rare earth(about 2 times) and light rare earth(about 1.5 times). As a analysis result with ICP-MS on the soil samples from the soil detailed pit survey, we only identified outcrop considering as economic weathered granite body at the grid point 1-10 pit among 7 pits. As a synthetic consideration on the soil geochemical exploration and detailed pit survey, we tentatively designated Tri Le area as no promising target for REE. In 2014, we have the plan to carry out the soil geochemical exploration targeting the extended economic REE ore body in Quy Chau as project area from 2011 to 2012.

Keywords REE, Nghe An, Vietnam

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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