新疆阿尔泰凯勒克赛依铁矿地质特征、锆石LA-MC-ICP-MS U-Pb年龄及其意义  

Geological Characteristics,Zircon LA-MC-ICP-MS U-Pb Age of Kailekesaiyi Iron Deposit in Altay,Xinjiang,and Their Geological Implications

作　　者：郭旭吉 李彦[2] 杨成栋[3] 

机构地区：[1]新疆维吾尔自治区有色地质勘查局706地质队,新疆阿勒泰836500 [2]河北省地矿局探矿技术研究院,河北三河065201 [3]中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037

出　　处：《现代地质》2017年第1期11-19,共9页Geoscience

基　　金：国土资源部公益性行业科研专项经费项目(201211073)

摘　　要：凯勒克赛依铁矿床是新疆阿尔泰唯一的小型镜铁矿床,赋存于一套变质火山-沉积岩系中,近矿围岩为白云母石英片岩,矿体呈层状,与地层产状一致,矿石具有块状、条带状、条纹状构造,矿石中金属矿物主要为镜铁矿(TFe O=87.349%~88.988%,Ti O2=0~1.042%,Al2O3=0.036%~0.256%),矿化具有沉积特征。近矿围岩镜铁矿白云母石英片岩锆石LA-MC-ICP-MS U-Pb谐和年龄为(375.6±0.6)Ma,限定成矿时代在376 Ma左右,即中泥盆世成矿,是阿尔泰为数不多的中泥盆世成矿作用的产物。同时也厘定含矿的变质火山-沉积岩系属中—晚泥盆世阿勒泰镇组,不是前人认为的早泥盆世康布铁堡组。Kailekesaiyi iron deposit,the unique small specularite deposit in Altay,Xinjiang,occurs in a sequence of metamorphic volcanic-sedimentary rocks. The wall-rock is muscovite quartz schist,and the orebodies are stratiform and in accordance with the stratigraphic occurrence. The ores occur as massive,banded,and striped structures. Ore minerals are dominated by specularite（ TFeO = 87. 349%- 88. 988%,TiO2= 0-1. 042%,Al2O3= 0. 036%- 0. 256%） with sedimentary characteristics. Zircons from the specularite muscovite-quartz schist yield a LA-MC-ICP-MS U-Pb concordant age of（ 375. 6 ± 0. 6） Ma,and constrained the ore forming age to the Middle Devonian（ ca. 376 Ma）,suggesting that this deposit is one product of the few Middle Devonian mineralization in Altay. Meanwhile,the ore-bearing metamorphic volcanic-sedimentary rocks are dated to the Middle-Late Devonian Altay Formation,rather than the Early Devonian Kangbutiebao Formation which is considered by the previous scholars.

关 键 词：铁矿床 地质特征 锆石U-PB定年 凯勒克赛依 阿尔泰 新疆 

分 类 号：P618.31[天文地球—矿床学]