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Occurrence and Geochemical Characteristics of the Haenam Pb-Zn Skarn Deposit

해남 연-아연 스카른광상의 산상과 지화학적 특성

  • Im, Heonkyung (Department of Geoenvironmental Sciences, Kongju National University) ;
  • Shin, Dongbok (Department of Geoenvironmental Sciences, Kongju National University) ;
  • Heo, Seonhee (Business Support Division, Korea Resources Corporation)
  • 임헌경 (공주대학교 지질환경과학과) ;
  • 신동복 (공주대학교 지질환경과학과) ;
  • 허선희 (한국광물자원공사 탐사지원처)
  • Received : 2014.07.08
  • Accepted : 2014.08.26
  • Published : 2014.08.28

Abstract

The Haenam Pb-Zn skarn deposit is located at the Hwawon peninsula in the southwestern part of the Ogcheon Metamorphic Belt. The deposit is developed along the contact between limestone of the Ogcheon group and Cretaceous quartz porphyry. Petrography of ore samples, chemical composition of skarn and ore minerals, and geochemistry of the related igneous rocks were investigated to understand the characteristics of the skarn mineralization. Skarn zonation consists of garnet${\pm}$pyroxene${\pm}$calcite${\pm}$quartz zone, pyroxene+garnet+quartz${\pm}$calcite zone, calcite+pyroxene${\pm}$garnet zone, quartz+calcite${\pm}$pyroxene zone, and calcite${\pm}$chlorite zone in succession toward carbonate rock. Garnet commonly shows zonal texture comprised of andradite and grossular. Pyroxene varies from Mn-hedenbergite to diopside as away from the intrusive rock. Chalcopyrite occurs as major ore mineral near the intrusive rock, and sphalerite and galena tend to increase as going away. Electron probe microanalyses revealed that FeS contents of sphalerite become decreased from 5.17 mole % for garnet${\pm}$pyroxene${\pm}$calcite${\pm}$quartz zone to 2.93 mole %, and to 0.40 mole % for calcite+pyroxene${\pm}$garnet zone, gradually. Ag and Bi contents also decreased from 0.72 wt.% and 1.62 wt.% to <0.01 wt.% and 0.11 wt.%, respectively. Thus, the Haenam deposit shows systematic variation of species and chemical compositions of ore minerals with skarn zoned texture. The related intrusive rock, quartz porphyry, expresses more differentiated characteristics than Zn-skarn deposit of Meinert(1995), and has relatively high$SiO_2$ concentration of 72.76~75.38 wt.% and shows geochemical features classified as calc-alkaline, peraluminous igneous rock and volcanic arc tectonic setting.

Keywords

Haenam Pb-Zn deposit;skarn;garnet;sphalerite;quartz porphyry

Acknowledgement

Supported by : 한국광물자원공사

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