新疆地质
新疆地質
신강지질
XINJIANG GEOLOGY
2014年
2期
158-163
,共6页
唐卓%陈隽璐%李鹏%白建科%张越%李现冰%孙晓攀%孙吉明
唐卓%陳雋璐%李鵬%白建科%張越%李現冰%孫曉攀%孫吉明
당탁%진준로%리붕%백건과%장월%리현빙%손효반%손길명
阿尔泰南缘%克朗盆地%康布铁堡组流纹岩%ICP-MS锆石U-Pb定年
阿爾泰南緣%剋朗盆地%康佈鐵堡組流紋巖%ICP-MS鋯石U-Pb定年
아이태남연%극랑분지%강포철보조류문암%ICP-MS고석U-Pb정년
Southern margin of Altay orogenic belt%Kelang Basin%Hyolite of Kangbutiebaio Formation%LA-ICP-MS Zircon U-Pb Geochronology
阿尔泰造山带南缘分布着大量晚古生代康布铁堡组火山岩,是多个铁、铜、铅锌矿的赋矿围岩。通过 LA-ICP-MS锆石U-Pb测年获得阿尔泰南缘克朗火山-沉积盆地内流纹岩年龄为(392.4±2.4)Ma,表明阿尔泰南缘克朗盆地康布铁堡组火山岩主要形成于晚古生代中泥盆世早期,具高硅(SiO2含量72%~78%)、高碱(总碱含量3%~7%)特征。Nb/Ta比值为8.8~10.1,可能为大陆地壳部分熔融产物。结合区域地质分析,认为它们可能产于与俯冲消减作用有关的陆缘岛弧的大地构造环境中。
阿爾泰造山帶南緣分佈著大量晚古生代康佈鐵堡組火山巖,是多箇鐵、銅、鉛鋅礦的賦礦圍巖。通過 LA-ICP-MS鋯石U-Pb測年穫得阿爾泰南緣剋朗火山-沉積盆地內流紋巖年齡為(392.4±2.4)Ma,錶明阿爾泰南緣剋朗盆地康佈鐵堡組火山巖主要形成于晚古生代中泥盆世早期,具高硅(SiO2含量72%~78%)、高堿(總堿含量3%~7%)特徵。Nb/Ta比值為8.8~10.1,可能為大陸地殼部分鎔融產物。結閤區域地質分析,認為它們可能產于與俯遲消減作用有關的陸緣島弧的大地構造環境中。
아이태조산대남연분포착대량만고생대강포철보조화산암,시다개철、동、연자광적부광위암。통과 LA-ICP-MS고석U-Pb측년획득아이태남연극랑화산-침적분지내류문암년령위(392.4±2.4)Ma,표명아이태남연극랑분지강포철보조화산암주요형성우만고생대중니분세조기,구고규(SiO2함량72%~78%)、고감(총감함량3%~7%)특정。Nb/Ta비치위8.8~10.1,가능위대륙지각부분용융산물。결합구역지질분석,인위타문가능산우여부충소감작용유관적륙연도호적대지구조배경중。
The Late Paleozoic volcanic rocks of Kangbutiebao Formation widely distributed in Southern margin of Al-tay orogenic belt, which are wall rocks of lots of iron,copper,lead and zinc ore deposits.LA-ICP MS U-Pb zircon analyses from rhyolite of Kangbutiebao FM.in Kelang basin yield wegihted m206Pb/238U ages of (392.4 ± 2.4 ) Ma,which show-ing volcanic rocks formed in the early part of the late Paleozoic. The Geochemical features to rhyolite with high silicon (SiO2 content 72% to 78%);high alkali (total alkali content in the range of 3% to 7%);Nb/Ta ratios range from 8.8 to 10.1, which showed that the may be the volcanic rocks are products of partial melting of the continental crust,combining the re-gional geological analysis they should form in subduction-related continental margin island arc geological environment.