阿尔泰山东部阿尔沙特地区酸性火山岩锆石U-Pb定年及地质意义
Zircon U-Pb Dating of Volcanic Rocks from Aershate Area in Eastern Altay and Its Geological Implications
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摘要: 阿尔泰山东部诺尔特-阿尔沙特地区晚古生代火山岩十分发育,其中阿尔沙特一带出露一套片理化蚀变流纹岩与含凝灰质英安流纹岩的岩石组合,呈北西-南东向带状展布,前人将其划为石炭系红山嘴组a段,其岩性组合明显区别于红山嘴组b、c段地层,且稳定成规模出露。本次工作笔者对其进行了LA-ICPMS锆石U-Pb测年,获得锆石的206Pb/238U和207Pb/235U谐和年龄为(400.5±4.6)Ma,206Pb/238U年龄加权平均值为(400.4±3.6)Ma,代表岩浆结晶年龄,时代为早泥盆世,较前人认为的石炭纪早。结合区域地质资料分析认为,(400.4±3.6)Ma区内古大洋俯冲已达到顶峰阶段,该火山岩形成于活动大陆边缘构造环境。
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关键词:
- 流纹岩 /
- LA-ICP-MS锆石U-Pb年龄 /
- 泥盆纪 /
- 阿尔沙特地区 /
- 阿尔泰
Abstract: The Nurt-Aershate area is located in the eastern part of Altay, where Late Paleozoic volcanic rocks are well developed. There exists a set of rock assemblages of altered rhyolite and tuff dacite rhyolite in Aershate area, which isextensively and stably distributed distribution from northwest to southeast with a zoned shape. This set of rock assemblages was originally assigned to the Member a of Hongshanzui Formation, but itslithologic characteristics is obviously different from Member b and c of Hongshanzui Formation. The altered rhyolitesare selected to determine for LA-ICP-MS zircon U-Pb ages. The result shows that the 206Pb/238U and 207Pb/235U concordia age is(400.5±4.6)Ma, the 206Pb/238U weighted average age is(400.4±3.6)Ma, indicating the rock crystallization age were formed in the Early Devonian, not Carboniferous. Combined with the data of southern margin of Altay, the volcanic rocks were generated in a continental arc setting of active continental margin.-
Key words:
- Rhyolite /
- LA-ICP-MS Zircon U-Pb isotope age /
- Devonian /
- Aershate area /
- Altay
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柴凤梅,毛景文,董连慧,等.阿尔泰南缘克朗盆地康布铁堡组变质火山岩年龄及岩石成因[J].岩石学报,2009,25(6):1403-1415.
CHAI Fengmei, MAO Jingwen, DONG Lianhui, et al. Geochronology and genesis of the meta-rhyolites in the Kangbutiebao Formation from the Kelang basin at the southern margin of the Altay, Xinjiang[J]. Acta Petrologica, 2009, 25(6):1403-1415.
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.
CHEN Hanlin, YANG Shufeng, LI Zilong, et al. Geochemistry and Tectonic Setting of Early Late Paleozoic Felsic Volcanic Rocks from the Altai Orogenic Belt, North Xinjiang[J]. Acta Geologica Sinica, 2006,80(1):38-42.
董连慧,屈迅,赵同阳,等.新疆北阿尔泰造山带早古生代花岗岩类侵入序列及其构造意义[J].岩石学报, 2012,28(8), 2307-2316.
DONG Lianhui, QU Xun, ZHAO Tongyang, et al. Magmatic sequence of Early Plaeozoic granitic intrusions and its tectonic implications in the Altay orogen, Xinjiang[J]. Acta Petrologica, 2012, 28(8):2307-2316.
董永观,芮行健,周刚,等.新疆诺尔特地区化探特征及成矿潜力分析[J].地质评价, 2010, 56(2):215-223.
DONG Yongguan, RUI Xingjian, ZHOU Gang, et al. Characteristics of regional geochemical exploration abnormity and mineralization in the Nurt area, Altay, Xinjiang[J]. Geological Review, 2010,56(2):215-223.
耿新霞,柴凤梅,杨富全,等.新疆阿尔泰南缘达拉乌兹双峰式火山岩年龄及岩石成因[J].岩石学报, 2010,26(10):2967-2980.
GENG Xinxia, CHAI Fengmei, YANG Fuquan, et al. Geochronology and genesis of the bimodal volcanic rocks in Dalawuzi from the southern margin of Altay, Xinjiang[J]. Acta Petrologica, 2010, 26(10):2967-2980.
韩宝福,何国琦.阿尔泰山南缘泥盆纪火山岩带的大地构造性质[J].新疆地质科学, 1991, 3:89-100.
HAN Baofu, HE Guoqi. Geotectonic properties of Devonian Volcanics in Southern Alaty[J]. Xinjiang Geological Science, 1991, 3:89-100.
李志纯, 赵志忠.阿尔泰造山带和阿尔泰山构造成矿域的形成[J].地质科学,2002, 37(4):483-490.
LI Zhichun, ZHAO Zhizhong. Creation of the Altali orogenic belt and the Altaimts. Tectono metallogenic province[J].Chinese Journal of Geology, 2002, 37(4):483-490. 龙晓平,袁超,孙敏, 等.北疆阿尔泰南缘泥盆系浅变质碎屑沉积岩地球化学特征及其形成环境[J].岩石学报, 2008, 24(4):718-732.
LONG Xiaoping, YUAN Chao, SUN Min, et al. Geochemical characteristics and sedimentary environments of Devonian low metamorphic clastic sedimentary rocks in the southern margin of Chinese Altai, Nortn Xinjiang[J]. Acta Geologica Sinica, 2008,24(4):718-732.
牛贺才,许继峰,于学元,等. 新疆阿尔泰富镁火山岩系的发现及其地质意义[J].科学通报, 1999, 44(9):1002-1004.
NIU Hecai, XU Jifeng, YU Xueyuan, et al. The discovery of the Rich-Mg Volcano rock series in the Altai, Xinjiang, and its geological significance[J]. Chinese Science Bulletin, 1999, 44(9):1002-1004.
潘桂棠,肖庆辉,陆松年,等.中国大地构造单元划分[J].中国地质,2009, 36(1):1-28.
PAN Guitang, XIAO Qinghui, LU Songnian, et al. Subdivision of tectonic units in China[J].Geology in China, 2009, 36(1):1-28.
单强,曾乔松,罗勇,等.新疆阿尔泰康布铁堡组钾质和钠质流纹岩的成因及其同位素年代学研究[J].岩石学报, 2011, 27(12):3653-3665.
SHAN Qiang, ZENG Qiaosong, LUO Yong, et al. SHRIMP U-Pb ages and petrology studies on the potassic and podic rhyolites in Altai, Nouth Xinjiang[J]. Acta Petrologica, 2011, 27(12):3653-3665.
宋国学,秦克章,刘铁兵,等.阿尔泰南缘阿舍勒盆地泥盆纪火山岩中古老锆石的U-Pb年龄、Hf同位素和稀土元素特征及其地质意义[J].岩石学报, 2010, 26(10):2946-2958.
SONG Guoxue, QIN Kezhang, LIU Tiebing, et al. The U-Pb ages, Hf isotope and REE patterns of older zircons from Devonian rocks in Ashele basin on the southern margin of Altai orogen and its significance[J]. Acta Petrologica, 2010, 26(10):2946-2958.
万博,张连昌.新疆阿尔泰南缘泥盆纪多金属成矿带Sr-Nd-Pb同位素地球化学与构造背景探讨[J].岩石学报, 2006, 22(1):145-152.
WAN Bo, ZHANG Lianchang. Sr-Nd-Pb isotope geochemistry and tectonic seting of Devonian polymetallic metallogenic belt on the Southern margin of Altaid, Xinjiang[J]. Acta Petrologica, 2006, 22(1):145-152.
王京彬,秦克章,吴志亮,等.阿尔泰山南缘火山喷流沉积型铅锌矿床[M].北京:地质出版社, 1998:18-60.
WANG Jingbin, QIN Kezhang, WU Zhiliang, et al. Pb-Zn Deposit of Volcano exhalative sedimentation on Southern margin of Altay, Xinjiang[M]. Beijing:Geological Publishing House, 1998:18-60.
王涛,童英, 李舢,等.阿尔泰造山带花岗岩时空演变、构造环境及地壳生长意义——以中国阿尔泰为例[J].岩石矿物学杂志, 2010, 29(6):595-618.
WANG Tao, TONG Ying, LI Shan, et al. Spatial and temporal variations of granitoids in the Altay orogen and their implications for tectonic setting and crustal growth:perspectives from Chinese Altay[J]. Acta Petrologica et Mineralogice, 2010, 29(6):595-618.
许继峰,梅厚钧,于学元,等.准噶尔北缘晚古生代岛弧中与俯冲作用有关的adakite火山岩:消减板片部分熔融的产物[J].科学通报, 2001, 46(8):684-687.
XU Jifeng, MEI Houjun, YU Xueyuan, et al. Late Paleozoic Adakite Volcano rocks related to Subduction from the island are in the northern Junggar:Product of partial melting of the subduction plate[J]. Chinese Science Bulletin, 2001, 46(8):684-687.
袁峰,周涛发,岳书仓.阿尔泰诺尔特地区火山岩岩石地球化学特征及构造背景[J].地质地球化学, 2001a, 29(2):31-35.
YUAN Feng, ZHOU Taofa, YUE Shucang. Geochemical characteristics and tectonic setting of the volcanic rock in the Nurt area of Altay[J]. Geology Geochemistry,2001a, 29(2):31-35.
袁峰,周涛发,岳书仓.阿尔泰诺尔特地区花岗岩形成时代及成因类型[J].新疆地质, 2001b, 19(4):292-296.
YUAN Feng, ZHOU Taofa, YUE Shucang. The ages and the genetic types of the granites in the Nurt area, Altay[J].Xinjiang Geology, 2001b, 19(4):292-296.
袁旭音,朱韶华,周华平,等. 阿尔泰诺尔特地区地层一岩浆一构造轮廓初析[J].新疆地质, 2002, 14(1):1-11.
YUAN Xuyin, ZZHU Shaohua, ZHOU Huaping, et al. Outline of stratigraphy-magma-tectonics in Nurt area of Altay[J].Xinjing Geology, 2002, 14(1):1-11.
张海祥, 牛贺才, Hiroaki Sato,等.新疆北部晚古生代埃达克岩、富铌玄武岩组合:古亚洲洋板块南向俯冲的证据[J].高校地质学报, 2004, 10(1):106-113.
ZHANG Haixiang, NIU Hecai, Hiroaki Sota, et al. Late Paleozoic Adakite and Nb-enriched Basalt from Northern Xinjiang:Evidence for the Southward Subduction of the Paleo-Asian Ocean[J]. Geological Journal of China Universities, 2004, 10(1):106-113.
张亚峰, 蔺新望, 王星, 等. 阿尔泰造山带南缘昆格依特岩体锆石LA-ICP-MS锆石U-Pb年代学、岩石成因及其地质意义[J].现代地质,2014, 28(1):16-28.
ZHANG Yafeng, LIN Xinwang, WANG Xing,et al.LA-ICP-MS U-Pb Geochronology, Petrogenesis and Its Geological Implications of Kungeyite plutons in southern Altay orogenic belt[J].Geoscience,2014,28(1):16-28.
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.
ZHOU Gang, QIN Jihua, ZHANG Zhaochong, et al.The discovery of bimodal volcanics in supute area of Fuyun county,Xinjiang,and its geological signif icance[J]. Geological Review,2007,53(3):337-348.
周涛发,袁峰,岳书仓.诺尔特断陷火山盆地石炭纪火山岩成因及火山作用机理[J].合肥工业大学学报(自然科学版), 2002, 25(4):481-486.
ZHOU Taofa, YUAN Feng, YUE Shucang. Volcanism and genesis of Carboniferous volcanic rorks in the Nurt faulted volcanic basin[J]. Journal of Hefel University of Technology,2002,25(4):481-486.
ANDERSON T. Correction of common Pb in U-Pb analyses that do not report 204Pb[J].Chemcal Geology, 2002, 192(1-2):59-79.
LUDWIGK R. Isoplot/Ex version 2.49. A Geochronological Toolkit for Microsoft Excel[J].Berkeley:Berkeley Geochronology Center Special Publication No.1a, 2003:1-56.
WANG Tao, HONG Dawei, JAHN Borming, et al. Timing, Petrogenesis, and Setting of Paleozoic Synorogenic intrusions from the Altai Mountains, Northw est China:implicat ions for the tectonic evolution of an accret ionary Orogen, Journal of Geology, 2006, 114:735-751.
YUAN Honglin, GAO Shan, LIU Xiaoming, et al. Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma-mass spectrometry[J]. Geostandards and Geoanalytical Research, 2004, 28(3):353-370.
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