新疆地质
新疆地質
신강지질
XINJIANG GEOLOGY
2014年
3期
301-309
,共9页
田健%廖群安%吴魏伟%陈帅%胡朝斌%张晓军%樊光明%聂小妹%王富明
田健%廖群安%吳魏偉%陳帥%鬍朝斌%張曉軍%樊光明%聶小妹%王富明
전건%료군안%오위위%진수%호조빈%장효군%번광명%섭소매%왕부명
东准噶尔%卡拉麦里%五彩城%酸性岩脉%陆内伸展%找矿前景
東準噶爾%卡拉麥裏%五綵城%痠性巖脈%陸內伸展%找礦前景
동준갈이%잡랍맥리%오채성%산성암맥%륙내신전%조광전경
Eastern Junngar%Karamaili%Wucaicheng%Acidic veins%Intra-continental extension%Prospecting potential
卡拉麦里断裂以南五彩城一带分布有大量以岩脉和小岩滴形式存在的流纹斑岩和花岗斑岩,这些浅成脉体侵位于上石炭统巴塔玛依内山组、上泥盆-下石炭统克安库都克组及志留系。LA-ICP-MS锆石U-Pb年龄显示,花岗斑岩及流纹斑岩形成于晚石炭世中-晚期(花岗斑岩年龄为(309.1±3.1)Ma,流纹斑岩年龄为(302.9±4.1)Ma)。Q ’-ANOR图中花岗斑岩及流纹斑岩主要投在碱长花岗岩及正长花岗岩区内,岩石高SiO2(73.38%~77.05%), K2O/Na2O=1.18%~1.84%,球粒陨石标准化的REE分布型式具LREE略富集的近似海鸥型的分布型式,岩石地球化学特征显示出高分异的A型花岗岩特点。从时空分布上看,这些岩脉应为晚石炭世巴塔玛依内山组火山岩的潜火山岩,后者具明显的的双峰式火山岩特征,形成时间上这些岩脉也与北部邻区的黄羊山、老鸭泉A型花岗岩体的形成年龄(300~311 Ma)十分接近,认为其应属陆内伸展环境产物。本研究在花岗斑岩中发现有岩浆晚期热液蚀变型的Cu,Pb,Zn矿化,与黄羊山、萨北及老鸭泉岩体中的Cu,Pb,Zn矿床成因类型相同,认为卡拉麦里断裂以南广泛发育的晚石炭世的潜火山岩可能具较好的找矿前景。
卡拉麥裏斷裂以南五綵城一帶分佈有大量以巖脈和小巖滴形式存在的流紋斑巖和花崗斑巖,這些淺成脈體侵位于上石炭統巴塔瑪依內山組、上泥盆-下石炭統剋安庫都剋組及誌留繫。LA-ICP-MS鋯石U-Pb年齡顯示,花崗斑巖及流紋斑巖形成于晚石炭世中-晚期(花崗斑巖年齡為(309.1±3.1)Ma,流紋斑巖年齡為(302.9±4.1)Ma)。Q ’-ANOR圖中花崗斑巖及流紋斑巖主要投在堿長花崗巖及正長花崗巖區內,巖石高SiO2(73.38%~77.05%), K2O/Na2O=1.18%~1.84%,毬粒隕石標準化的REE分佈型式具LREE略富集的近似海鷗型的分佈型式,巖石地毬化學特徵顯示齣高分異的A型花崗巖特點。從時空分佈上看,這些巖脈應為晚石炭世巴塔瑪依內山組火山巖的潛火山巖,後者具明顯的的雙峰式火山巖特徵,形成時間上這些巖脈也與北部鄰區的黃羊山、老鴨泉A型花崗巖體的形成年齡(300~311 Ma)十分接近,認為其應屬陸內伸展環境產物。本研究在花崗斑巖中髮現有巖漿晚期熱液蝕變型的Cu,Pb,Zn礦化,與黃羊山、薩北及老鴨泉巖體中的Cu,Pb,Zn礦床成因類型相同,認為卡拉麥裏斷裂以南廣汎髮育的晚石炭世的潛火山巖可能具較好的找礦前景。
잡랍맥리단렬이남오채성일대분포유대량이암맥화소암적형식존재적류문반암화화강반암,저사천성맥체침위우상석탄통파탑마의내산조、상니분-하석탄통극안고도극조급지류계。LA-ICP-MS고석U-Pb년령현시,화강반암급류문반암형성우만석탄세중-만기(화강반암년령위(309.1±3.1)Ma,류문반암년령위(302.9±4.1)Ma)。Q ’-ANOR도중화강반암급류문반암주요투재감장화강암급정장화강암구내,암석고SiO2(73.38%~77.05%), K2O/Na2O=1.18%~1.84%,구립운석표준화적REE분포형식구LREE략부집적근사해구형적분포형식,암석지구화학특정현시출고분이적A형화강암특점。종시공분포상간,저사암맥응위만석탄세파탑마의내산조화산암적잠화산암,후자구명현적적쌍봉식화산암특정,형성시간상저사암맥야여북부린구적황양산、로압천A형화강암체적형성년령(300~311 Ma)십분접근,인위기응속륙내신전배경산물。본연구재화강반암중발현유암장만기열액식변형적Cu,Pb,Zn광화,여황양산、살북급로압천암체중적Cu,Pb,Zn광상성인류형상동,인위잡랍맥리단렬이남엄범발육적만석탄세적잠화산암가능구교호적조광전경。
There are lots of veins and drops including granite porphyry and rhyolite porphyry in Wucaicheng from the south of Karamaili fault,these dike swarm are intruded in Batamayineishan Formation of the Upper Carboniferous,Song-kaersu Formation of the lower Carboniferous and Silurian strata.LA-ICP-MS zircon U-Pb dating shows that granite por-phyry and rhyolite porphyry are formed in the middle-late stage of Late Carboniferous (Weighted mean 206Pb/238U age of granite porphyry is (2 309.1 ± 3.1) Ma,rhyolite porphyry is (302.9 ± 4.1) Ma).Granite porphyry and rhyolite porphyry in-vest in the areas containing alkali feldspar granite and syenite granite in Q '-ANOR graph,the characteristics of granite porphyry and rhyolite porphyry are mainly displayed that high SiO2 content (73.38%~77.05%),K2O>Na2O(K2O/Na2O is 1.18~1.84),the approximating seagull REE distribution pattern of LREE slightly enriched LREE and flat HREE. Petro-geochemistry shows the characteristics of High differentiation of A-type granite.From the temporal and spatial distribu-tion,these veins should be subvolcanic rocks of Batamayineishan Formation,which is characterized bimodal volcanic rocks.moreover,formed in intra-continental extensional stage.The formation age of these veins is close to those A-type plutons including Huangyangshan and Laoyaquan from the north of Karamaili fault,therefore,it is believed these contem-poraries veins and plutons are a product of intra-continental extension.And it is found hydrothermal alteration Cu,Pb and Zn mineralizations from late magmatic namely granite porphyry,the genetic type is the same as mineral deposits from Huangyangshan,Sabei and Laoyaquan,consequently,lots of subvolcanic rocks of Late Carboniferous from the south of Karamaili fault (rhyolite porphyry etc.) may have great prospecting potential.