新疆阿尔泰苏普特H64-8铜矿成因类型研究——来自锆石U-Pb定年、岩石地球化学和硫同位素的约束
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摘要
新疆阿尔泰南缘晚古生代岩浆活动强烈,在麦兹火山沉积盆地内产出有一系列的铅锌铁铜多金属矿床。苏普特H64-8铜矿点是区内近几年新发现的一处铜矿点,平均品位为0.44%。含矿岩性主要为下泥盆统康布铁堡组变安山质凝灰岩,主要蚀变类型有硅化、绿帘石化及矽卡岩化等,矿石中金属矿物主要有黄铁矿、磁黄铁矿、磁铁矿、黄铜矿。本次工作虽首次获得了变酸性熔岩的年龄值为(901±5.6)Ma,但这个年龄值不可能代表苏普特铜矿化作用的成岩成矿时代,仅反映了深部基底可能存在新元古代地层。赋矿的下泥盆统康布铁堡组以中基性火山岩为主,是早泥盆世俯冲作用的产物,与区域上广泛出露的康布铁堡组双峰式火山岩相比,构造环境相同,只是处于相同环境下的不同演化阶段。综合成矿地质特征、构造环境分析和成矿物质来源研究,认为苏普特背斜HS64-8铜矿点是火山沉积改造型铜矿床。
Late Paleozoic magmatism is strong in the southern margin of Xinjiang Altay,and a series of lead,zinc,iron,copper,and polymetallic mineralization occurred in the Maizi volcano-sedimentary basin.The Supute H64-8 copper occurrence is a newly discovered copper occurrence in the region in recent years,with an average grade of 0.44%.The ore-bearing rocks is mainly the meta-andesitic tuff of the Lower Devonian Kangbutiebao Formation,and the main alteration types include silicification,epidotization,and skarnization,etc.Ore minerals include pyrite,pyrrhotine,magnetite,and chalcopyrite.Although this paper yield(901±5.6)Ma of the meta-felsic volcanic lava for the first time,this age is unlikely to represent the timing of host rocks and ore formation of the Supute copper occurrence,but only reflects the possible existence of Neoproterozoic strata in the deep basement.The ore-bearing Lower Devonian Kangbutiebao Formation is dominated by medium-basic volcanic rocks and is a product of the Early Devonian subduction.Compared with the widely-distributed bimodal volcanic rocks of the Kangbutiebao Formation in the region,it was formed in the same environment but different stages of evolution.In combination with the research of deposit geology,tectonic environment,and metal sources,the Supute HS64-8 copper occurrence is classified as a volcano-sedimentary reformation type.
Late Paleozoic magmatism is strong in the southern margin of Xinjiang Altay,and a series of lead,zinc,iron,copper,and polymetallic mineralization occurred in the Maizi volcano-sedimentary basin.The Supute H64-8 copper occurrence is a newly discovered copper occurrence in the region in recent years,with an average grade of 0.44%.The ore-bearing rocks is mainly the meta-andesitic tuff of the Lower Devonian Kangbutiebao Formation,and the main alteration types include silicification,epidotization,and skarnization,etc.Ore minerals include pyrite,pyrrhotine,magnetite,and chalcopyrite.Although this paper yield(901±5.6)Ma of the meta-felsic volcanic lava for the first time,this age is unlikely to represent the timing of host rocks and ore formation of the Supute copper occurrence,but only reflects the possible existence of Neoproterozoic strata in the deep basement.The ore-bearing Lower Devonian Kangbutiebao Formation is dominated by medium-basic volcanic rocks and is a product of the Early Devonian subduction.Compared with the widely-distributed bimodal volcanic rocks of the Kangbutiebao Formation in the region,it was formed in the same environment but different stages of evolution.In combination with the research of deposit geology,tectonic environment,and metal sources,the Supute HS64-8 copper occurrence is classified as a volcano-sedimentary reformation type.
引文
[1]叶庆同,傅旭杰,王保良.新疆阿尔泰山南缘多金属成矿带的成矿规律[J].地质学报,1998,72(4):349-357.
[2]王登红.新疆阿舍勒铜矿区火山岩与成矿[J].地质科学,1996,31(2):163-169.
[3]耿新霞,杨富全,杨建民,等.新疆阿尔泰铁木尔特铅锌矿床稳定同位素组成特征[J].矿床地质,2010,29(6):1088-1100.
[4]王京彬.新疆可可塔勒铅锌成矿带成矿规律[J].新疆地质,1998,16(3):236-244.
[5]秦克章,王京彬,张进红,等.阿尔泰山南缘可可塔勒式大型铅锌矿床的成矿条件分析[J].有色金属矿产与勘查,1998,7(2):65-74.
[6]郭正林,郭旭吉,王书来,等.阿尔泰南缘麦兹泥盆纪火山-沉积盆地成矿特点及其铅锌、铁、金找矿潜力分析[J].矿床地质,2007,26(1):128-138.
[7]于淑艳,许英霞,郭正林,等.新疆苏普特背斜花岗岩和变安山质凝灰岩LA-ICP-MS锆石U-Pb年代学特征及意义[J].西北地质,2011,44(2):15-24.
[8]曾乔松,陈广浩,王核,等.阿尔泰冲乎尔盆地花岗质岩类的锆石SHRIMP U-Pb定年及其构造意义[J].岩石学报,2007,23(8):1921-1932.
[9]YUAN C,SUN M,XIAO W J,et al.Accretionary orogenesis of the Chinese Altai:insights from Paleozoic granitoids[J].Chemical Geology,2007,242(1):22-39.
[10]张海祥,牛贺才,TERADA K,等.新疆北部阿尔泰地区库尔提蛇绿岩中斜长花岗岩的SHRIMP年代学研究[J].科学通报,2003,48(12):1350-1354.
[11]周刚,秦纪华,张招崇,等.新疆富蕴县苏普特一带双峰式火山岩的发现及其地质意义[J].地质论评,2007,53(3):337-348.
[12]单强,牛贺才,于学元,等.新疆北部阿尔泰南缘晚古生代高钾高硅熔结凝灰岩的地球化学、岩浆成因及构造背景[J].岩石学报,2007,23(7)1721-1729.
[13]牛贺才,于学元,徐继峰,等.中国新疆阿尔泰晚古生代火山作用及成矿[M].北京:地质出版社,2006:1-82.
[14]万博,张连昌.新疆阿尔泰山南缘泥盆纪多金属成矿带Sr-NdPb同位素地球化学与构造背景探讨[J].岩石学报,2006,22(1):145-152.
[15]陈汉林,杨树锋,厉子龙,等.阿尔泰晚古生代早期长英质火山岩的地球化学特征及构造背景[J].地质学报,2006,80(1):38-42.
[2]王登红.新疆阿舍勒铜矿区火山岩与成矿[J].地质科学,1996,31(2):163-169.
[3]耿新霞,杨富全,杨建民,等.新疆阿尔泰铁木尔特铅锌矿床稳定同位素组成特征[J].矿床地质,2010,29(6):1088-1100.
[4]王京彬.新疆可可塔勒铅锌成矿带成矿规律[J].新疆地质,1998,16(3):236-244.
[5]秦克章,王京彬,张进红,等.阿尔泰山南缘可可塔勒式大型铅锌矿床的成矿条件分析[J].有色金属矿产与勘查,1998,7(2):65-74.
[6]郭正林,郭旭吉,王书来,等.阿尔泰南缘麦兹泥盆纪火山-沉积盆地成矿特点及其铅锌、铁、金找矿潜力分析[J].矿床地质,2007,26(1):128-138.
[7]于淑艳,许英霞,郭正林,等.新疆苏普特背斜花岗岩和变安山质凝灰岩LA-ICP-MS锆石U-Pb年代学特征及意义[J].西北地质,2011,44(2):15-24.
[8]曾乔松,陈广浩,王核,等.阿尔泰冲乎尔盆地花岗质岩类的锆石SHRIMP U-Pb定年及其构造意义[J].岩石学报,2007,23(8):1921-1932.
[9]YUAN C,SUN M,XIAO W J,et al.Accretionary orogenesis of the Chinese Altai:insights from Paleozoic granitoids[J].Chemical Geology,2007,242(1):22-39.
[10]张海祥,牛贺才,TERADA K,等.新疆北部阿尔泰地区库尔提蛇绿岩中斜长花岗岩的SHRIMP年代学研究[J].科学通报,2003,48(12):1350-1354.
[11]周刚,秦纪华,张招崇,等.新疆富蕴县苏普特一带双峰式火山岩的发现及其地质意义[J].地质论评,2007,53(3):337-348.
[12]单强,牛贺才,于学元,等.新疆北部阿尔泰南缘晚古生代高钾高硅熔结凝灰岩的地球化学、岩浆成因及构造背景[J].岩石学报,2007,23(7)1721-1729.
[13]牛贺才,于学元,徐继峰,等.中国新疆阿尔泰晚古生代火山作用及成矿[M].北京:地质出版社,2006:1-82.
[14]万博,张连昌.新疆阿尔泰山南缘泥盆纪多金属成矿带Sr-NdPb同位素地球化学与构造背景探讨[J].岩石学报,2006,22(1):145-152.
[15]陈汉林,杨树锋,厉子龙,等.阿尔泰晚古生代早期长英质火山岩的地球化学特征及构造背景[J].地质学报,2006,80(1):38-42.