STABLE ISOTOPE OF PB-ZN DEPOSITS OCCURRED IN THE MAIZI DEVONIAN VOLCANIC SEDIMENTARY BASIN IN THE SOUTH MARGIN OF ALTAY MOUNTAIN,XINJIANG
STABLE ISOTOPE OF PB-ZN DEPOSITS OCCURRED IN THE MAIZI DEVONIAN VOLCANIC SEDIMENTARY BASIN IN THE SOUTH MARGIN OF ALTAY MOUNTAIN,XINJIANG
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发表时间：
2007
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通讯作者：
Guo Quan
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作者：
Guo Quan
麦子火山-沉积盆地铅锌矿床以类层状和透镜状赋存。矿体直接赋存于火山-沉积岩中。矿石构造以带状、块状、斑状为主，矿石成分相对单一。矿石δ34S值为-20.6‰~ 10‰。石英包裹体中水的δD值为89.1‰~-49.48‰，δ18OSMOW值为4.7‰~1.2‰。矿化层方解石δ13C值为-6.7‰~-14.3‰，δ18O值为10.3‰~12.9‰。无矿或微铅矿化产物方解石的δ13C值为0.6‰~-1.7‰，δ18O值为13.5‰~18.0‰。矿床类型为火山-沉积型块状硫化物矿床。新型块状硫化物矿床或介于典型火山型块状硫化物矿床（VHMS型）与典型沉积喷淋型矿床（SEDEX型）之间的中间类型。成矿特征与“伊比利亚型”矿床相似。
Pb-Zn deposits in the Maizi volcano-sedimentary basin occur in stratiform-oid and lentiform.Ore bodies are directly hosted in volcanic-sedimentary rocks.Ore structure is predominantly banded,massive and mottled with relatively simple ore composition.Ore δ34S value ranges from-20.6‰ to-10‰.δD value of water in fluid inclusion hosted in quartz is-89.1‰~-49.48‰,and δ18OSMOW value of 4.7‰~1.2‰.Calcite δ13C value in mineralized horizons yields-6.7‰～-14.3‰ and δ18O value of 10.3‰~12.9‰.Correspondingly,calcite of ore-barren or slightly lead-mineralized produces gives δ13C value of 0.6‰~-1.7‰ and δ18O value of 13.5‰~18.0‰.It is suggested that the deposit belongs to a volcanic-sedimentary hosted massive sulfide deposit,i.e.,a new-type massive sulfide deposit or an intermediate type between typical volcanic-hosted massive sulfide deposit(VHMS type) and typical sedimentary exhalative deposit(SEDEX type).Mineralization characteristics are similar to that of "Iberian-type" deposits.