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黄金科学技术 ›› 2019, Vol. 27 ›› Issue (5): 678-686.doi: 10.11872/j.issn.1005-2518.2019.05.678

• 矿产勘查与资源评价 • 上一篇    下一篇

东准噶尔卡拉麦里辉长岩斜锆石U-Pb年代学及其构造意义

于漫1(),第鹏飞2   

  1. 1. 甘肃省国土资源规划研究院,甘肃 兰州 730000
    2. 甘肃省矿产资源储量评审中心,甘肃 兰州 730000
  • 收稿日期:2018-10-29 修回日期:2019-04-29 出版日期:2019-10-31 发布日期:2019-11-07
  • 作者简介:于漫(1973-),女,吉林伊通人,工程师,从事矿产与土地资源规划工作。379804002@qq.com
  • 基金资助:
    国家自然科学基金项目“东昆仑造山带夏日哈木岩浆铜镍硫化物矿床成矿机制的流体组成;多元同位素制约”(41872073);“峨眉山大火成岩省钒钛磁铁矿矿床成矿机制的流体组成制约”(41472070);甘肃省科技计划项目“金川铜镍硫化物矿床成矿过程Mg-Sr-Nd-Hf-O同位素组成示踪”(18JR3RA266);兰州大学中央高校基本科研业务费专项资金“金川Ni-Cu硫化物矿床成矿过程的Mg同位素组成示踪”(lzujbky-2017-77)

Baddeleyite U-Pb Geochronology and Tectonic Significance of the Gabbro in Kalamaili, Eastern Junggar

Man YU1(),Pengfei DI2   

  1. 1. Gansu Institute of Land Resources Planning and Research, Lanzhou 730000, Gansu, China
    2. Gansu Assessment Center of Mineral Resources Reserves, Lanzhou 730000, Gansu, China
  • Received:2018-10-29 Revised:2019-04-29 Online:2019-10-31 Published:2019-11-07

摘要:

卡拉麦里蛇绿岩带是东准噶尔重要的组成部分,该蛇绿岩带沿卡拉麦里山呈NWW向展布,延伸约400 km,主要由橄榄岩、辉长岩、斜长花岗岩和少量的硅质岩组成。选取蛇绿岩带西段呈团块状出露的辉长岩斜锆石进行了LA-ICP-MS锆石 U-Pb 测年得出,辉长岩谐和年龄为(434.4±2.7) Ma(MSWD=0.87),加权平均年龄为(436.4±2.5) Ma(MSWD=0.59),属早志留世。截至目前,该年龄是卡拉麦里蛇绿混杂岩中测得的最早年龄,标志着卡拉麦里洋盆在早志留世就已经开始拉张形成,即在扎河坝—阿尔曼太蛇绿岩所代表的洋盆闭合前,卡拉麦里洋盆就已经存在。

关键词: 蛇绿岩, 辉长岩, 斜锆石, 早志留世, 卡拉麦里, 东准噶尔

Abstract:

The Kalamaili ophiolite belt is an important component of East Junggar.It extends along the Kalamaili Mountains in NWW direction, extending about 400 km.It is an important tectonic unit in the region. The opening and closing of oceanic separation represented by the ophiolite belt is of great significance to the tectonic evolution of the whole east Junggar region.Previous studies on the age of ophiolite have mainly come from the fossil age of siliceous rocks and the zircon U-Pb age of diabase, gabbro and baddeleyite granite. However,there are few reports on the age of baddeleyite in ophiolite.The Kalamaili ophiolite is mainly composed of peridotite,gabbro,plagiogranite and a small amount of siliceous rock, controlled by the Kalamaili fault, which makes gabbro appear as tectonic block and accompanied by peridotite.Gabbro belongs to the large class of silica-unsaturated rocks. Baddeleyite coexists steadily with pyroxene and olivine, while zircon belongs to silica-saturated, supersaturated minerals and gabbro. The crystallization of baddeleyitee is earlier than that of zircon, which is more representative of the true age of formation of rocks. Therefore, in this study, more than 200 baddeleyite were selected from fresh gabbro exposed in massive form in the western part of ophiolite belt, and 80 of them were selected to make targets and take transparent, reflective and cathodoluminescent photographs.Since baddeleyites are black in the cathodoluminescent photographs, LA-ICP-MS U-Pb dating was carried out at the selected testing sites of the transparent and reflective photographs, and 16 years of good harmony were obtained.Age data ranged from 431 Ma to 444 Ma. The harmonic age of rock 207Pb/235U-206Pb/238U is (434.4+2.7)Ma (MSWD=0.87) and the weighted average age of 206Pb/238U is (436.4+2.5)Ma (MSWD=0.59) calculated by ISOPLOT software. The two ages are consistent within the error range, indicating that the gabbro was formed in early Silurian.Up to now, this age is the earliest one found in the Karamari ophiolitic melange, which indicates that the Karamari oceanic basin began to stretch and form in the early Silurian.That is, the Karamari oceanic basin existed before the closure of the oceanic basin represented by the Zhaheba-Aermantai ophiolite in the north of the basin.

Key words: ophiolite, gabbro, diagonal zircon, Early Silurian, Kalamaili, eastern Junggar

中图分类号: 

  • P597+.3

图1

东准噶尔卡拉麦里地区区域地质图(a)据文献[25,26,27,28,29]修改;(b)据库普幅、卡姆斯特幅、卡拉麦里山幅1/20万地质图资料修编,图中部分年龄据文献[9,16-17,30]F1-卡拉麦里断裂;F2-清水—苏吉泉断裂图1(a)图例:1.中生代—新生代;2.二叠系;3.石炭系;4.泥盆系;5.奥陶—志留系;6.石炭—二叠纪花岗岩;7.志留—泥盆纪花岗岩;8.闪长岩;9.蛇绿岩;10.基性—超基性岩;11.国界线;图1(b)图例:1.泥盆系;2.早石炭世姜巴斯套组;3.早石炭世山梁砾石组;4.石炭纪巴塔玛依内山组;5.晚石炭世石钱滩组;6.流纹斑岩;7.花岗岩;8.斜长花岗岩;9.石英闪长岩;10.蛇绿岩;11.采样位置"

图2

辉长岩野外及镜下照片(a),(b)辉长岩野外照片,呈团块状出露;(c)辉长岩单偏光镜下照片;(d)辉长岩正交偏光镜下照片Aug-辉石;Pl-斜长石"

图3

斜锆石反射光、透射光及阴极发光照片"

表1

辉长岩斜锆石U-Pb测年数据"

样品编号同位素比值表面年龄/Ma
207Pb/235U1σ206Pb/238U1σ207Pb/235U1σ206Pb/238U1σ
14KL-5斜-010.5340.0120.070.00143584375
14KL-5斜-020.5250.0070.0710.00142954445
14KL-5斜-030.5350.0060.070.00143544395
14KL-5斜-040.5380.0070.070.00143744375
14KL-5斜-050.530.0070.0690.00143254315
14KL-5斜-060.5130.0060.0710.00142144425
14KL-5斜-070.5230.0070.0690.00142744325
14KL-5斜-080.5250.0070.070.00142944365
14KL-5斜-090.5330.0090.0710.00143464405
14KL-5斜-100.5310.0080.070.00143354375
14KL-5斜-110.5260.0070.0690.00142954315
14KL-5斜-120.5340.0070.070.00143554375
14KL-5斜-130.5220.0080.070.00142754355
14KL-5斜-140.5270.0090.0690.00143064325
14KL-5斜-150.520.0060.070.00142544345
14KL-5斜-160.5150.0060.070.00142244395

图4

卡拉麦里蛇绿混杂岩中辉长岩斜锆石U-Pb谐和年龄图(a)和加权平均年龄图(b)"

1 TangG J,WangQ,WymanD A,et al. Geochronology and geochemistry of Late Paleozoic magmatic rocks in the Lamasu-Dabate area,northwestern Tianshan (west China):Evidence for a tectonic transition from arc to post-collisional setting[J]. Lithos,2010,119(3/4):393-411.
2 XuZ,HanB F,RenR,et al.Ultramafic-mafic mélange,island arc and post-collisional intrusions in the Mayile Mountain,west Junggar,China:Implications for Paleozoic intra-oceanic subduction-accretion process[J]. Lithos,2012,132-133:141-161.
3 Jahn,WuB M,ChenF,et al.Granitoids of the Central Asian Orogenic Belt and continental growth in the Phanerozoic[J]. Transactions of the Royal Society of Edinburgh Earth Sciences,2000,91(1/2):181-193.
4 JahnB M,WindleyB,Natal’InB,et al. Phanerozoic continental growth in Central Asia [J]. Journal of Asian Earth Sciences,2004,23(5):599-603.
5 ChenB,JahnB M. Genesis of post-collisional granitoids and basement nature of the Junggar Terrane,NW China:Nd-Sr isotope and trace element evidence[J]. Journal of Asian Earth Sciences,2004,23(5):691-703.
6 肖序常,汤耀庆,冯益民,等.新疆北部及其邻区大地构造[M]. 北京:地质出版社,1992.
XiaoXuchang,TangYaoqing,FengYimin,et al.Tectonic Ecolution of the Northern Xinjiang and Its Adjacent Regions[M]. Beijing:Geological Publishing House,1992.
7 韩宝福,何国琦,王式洸.后碰撞幔源岩浆活动、底垫作用及准噶尔盆地基底的性质[J].中国科学(地球科学),1999,29(1):16-21.
HanBaofu,HeGuoqi,WangShiguang.Postcollisional mantle-deviced magmatism,underplating and implications for basement of the Junggar Basin[J]. Science China (Earth Sciences),1999,29(1):16-21.
8 李锦轶,杨天南,李亚萍,等. 东准噶尔卡拉麦里断裂带的地质特征及其对中亚地区晚古生代洋陆格局重建的约束[J]. 地质通报,2009,28(12):1817-1826.
LiJinyi,YangTiannan,LiYaping,et al.Geological features of the Karamaili faulting belt, eastern Junggar region, Xinjiang,China and its constraints on the reconstruction of Late Paleozoic ocean-continental framework of the Central Asian region[J].Geological Bulletin of China,2009,28(12):1817-1826.
9 汪帮耀,姜常义,李永军,等. 新疆东准噶尔卡拉麦里蛇绿岩的地球化学特征及大地构造意义[J]. 矿物岩石,2009,29(3):74-82.
WangBangyao,JiangChangyi,LiYongjun,et al. Geochemistry and tectonic implications of Karamaili ophiolite in east Junggar of Xinjiang[J]. Journal of Mineralogy and Petrology,2009,29(3):74-82.
10 李锦轶. 新疆东准噶尔蛇绿岩的基本特征和侵位历史[J]. 岩石学报,1995,11(增1):73-84.
LiJinyi. Main characteristics and emplacement processes of the east Junggar ophiolites,Xinjiang,China[J]. Acta Petrologica Sinica,1995,11(Supp.1):73-84.
11 李锦轶. 新疆东部新元古代晚期和古生代构造格局及其演变[J]. 地质论评,2004,50(3):304-322.
LiJinyi.Late Neoproterozoic and Paleozoic tectonic framework and evolution of eastern Xinjiang,NW China[J]. Geological Review,2004,50(3):304-322.
12 李锦轶,肖序常,汤耀庆,等. 新疆东准噶尔卡拉麦里地区晚古生代板块构造的基本特征[J]. 地质论评,1990,36(4):305-316.
LiJinyi,XiaoXuchang,TangYaoqing,et al. Main characteristics of Late Paleozoic plate tectonics in the southern part of east Junggar,Xinjiang[J].Geological Review,1990,36(4):305-316.
13 韩宝福,季建清,宋彪,等. 新疆准噶尔晚古生代陆壳垂向生长(Ⅰ)——后碰撞深成岩浆活动的时限[J]. 岩石学报,2006,22(5):1077-1086.
HanBaofu,JiJianqing,SongBiao,et al. Late Paleozoic vertical growth of continental crust around the Junggar Basin,Xinjiang,China(Part Ⅰ):Timing of post-collisionai plutonism[J]. Acta Petrologica Sinica,2006,22(5):1077-1086.
14 黄岗,牛广智,王新录,等. 新疆东准噶尔卡拉麦里蛇绿岩的形成和侵位时限——来自辉绿岩和凝灰岩LA-ICP-MS锆石U-Pb年龄的证据[J]. 地质通报,2012,31(8):1267-1278.
HuangGang,NiuGuangzhi,WangXinlu,et al.Formation and emplacement age of Karamaili ophiolite:LA-ICP-MS zircon U-Pb age evidence from the diabase and tuff in eastern Junggar,Xinjiang[J]. Geological Bulletin of China,2012,31(8):1267-1278.
15 杨高学,李永军,李注苍,等. 东准噶尔东北缘后碰撞火山岩成因与构造环境[J]. 地学前缘,2010,17(1):49-60.
YangGaoxue,LiYongjun,LiZhucang,et al. Genesis and tectonic settings of post-collision volcanic rocks in north eastern margin of east Junggar,Xinjiang[J]. Earth Science Frontiers,2010,17(1):49-60.
16 杨高学,李永军,吴宏恩,等. 东准噶尔卡拉麦里地区黄羊山花岗岩和包体LA-ICP-MS锆石U-Pb测年及地质意义[J]. 岩石学报,2009,25(12):97-107.
YangGaoxue,LiYongjun,WuHong’en,et al. LA-ICP-MS zircon U-Pb dating of the Huangyangshan pluton and its enclaves from Kalamaili area eastern Junggar,Xinjiang,and geological implications[J]. Acta Petrologica Sinica,2009,25(12):97-107.
17 唐红峰,苏玉平,刘丛强,等. 新疆北部卡拉麦里斜长花岗岩的锆石U-Pb年龄及其构造意义[J]. 大地构造与成矿学,2007,31(1):110-117.
TangHongfeng,SuYuping,LiuCongqiang,et al. Zircon U-Pb age of the plagiogranite in Kalamaili belt, northern Xinjiang and its tectonic implications[J].Geotectonica et Metallogenia,2007,31(1):110-117.
18 舒良树,王玉净. 新疆卡拉麦里蛇绿岩带中硅质岩的放射虫化石[J]. 地质论评,2003,49(4):408-412.
ShuLiangshu,WangYujing.Late Devonian-Early Carboniferous radiolarian fossils from siliceous rock of the Kelameili ophiolite,Xinjiang[J].Geological Review,2003,49(4):408-412.
19 李亚萍,李锦轶,孙桂华,等. 准噶尔盆地基底的探讨:来自原泥盆纪卡拉麦里组砂岩碎屑锆石的证据[J]. 岩石学报,2007,23(7):1577-1590.
LiYaping,LiJinyi,SunGuihua,et al. Basement of Junggar basin:Evidence from detrital zircons in sandstone of previous Devonian Kalamaili formation[J]. Acta Petrologica Sinica,2007,23(7):1577-1590.
20 吴小奇,刘德良,魏国齐,等. 准噶尔盆地陆东—五彩湾地区石炭系火山岩地球化学特征及其构造背景[J]. 岩石学报,2009,25(1):55-66.
WuXiaoqi,LiuDeliang,WeiGuoqi,et al. Geochemical characteristics and tectonic settings of Carboniferous volcanic rocks from Ludong-Wucaiwan area,Junggar Basin[J]. Acta Petrologica Sinica,2009,25(1):55-66.
21 何国琦,李茂松,贾进斗,等. 论新疆东准噶尔蛇绿岩的时代及其意义[J]. 北京大学学报(自然科学版),2001,37(6):852-858.
HeGuoqi,LiMaosong,JiaJindou,et al. A discussion on age and tectonic significance of ophiolitein eastern Junggar,Xinjiang[J]. Acta Scicentiarum Naturalum Universitis Pekinesis,2001,37(6):852-858.
22 李现冰.新疆东准噶尔卡拉麦里蛇绿混杂岩组成、结构及演化研究[D].西安:长安大学,2013.
LiXianbing.The Characteristics of Kalamaily Ophiolite Complex,Structure and Evolution in Eastern Junggar,Xinjiang[D]. Xi’an:Chang’an University,2013.
23 HeamanL M,LecheminantA N. Paragenesis and U-Pb systematics of baddeleyite (ZrO2)[J]. Chemical Geology,1993,110(1/2/3):95-126.
24 李惠民,李怀坤,陈志宏,等. 基性岩斜锆石U-Pb同位素定年3种方法之比较[J]. 地质通报,2007,26(2):128-135.
LiHuimin,LiHuaikun,ChenZhihong,et al. Comparison of three methods for baddeleyite U-Pb isotope dating of basic rocks[J]. Geological Bulletin of China,2007,26(2):128-135.
25 SengörA M C,Natal’InB A,BurtmanV S. Evolution of the Altaid tectonic collage and Paleozoic crustal growth in Eurasim[J]. Nature,1993,364:299-307.
26 JahnB,WuF,ChenB.Granitoids of the Central Asian Orogenic Belt and continental growth in the Phanerozoic[J]. Geological Society of America Special Papers,2000,350:181-193.
27 WindleyB F,KrönerA,GuoJ,et al. Neoproterozoic to Paleozoic geology of the Altai orogen,NW China:New zircon age data and tectonic evolution[J]. The Journal of Geology,2002,110(6):719-737.
28 WangT,HongD,JahnB,et al. Timing,Petrogenesis,and setting of Paleozoic Synorogenic intrusions from the Altai Mountains,northwest China:Implications for the tectonic evolution of an accretionary orogen[J]. The Journal of Geology,2006,114(6):735-751.
29 ShenX,ZhangH,WangQ,et al. Late Devonian-Early Permian A-type granites in the southern Altay Range,northwest China:Petrogenesis and implications for tectonic setting of “A-type” granites[J].Journal of Asian Earth Sciences,2011,42(42):986-1007.
30 张峰,徐涛,范俊杰,等. 东准噶尔石炭系巴塔玛依内山组火山岩全岩Sm-Nd等时线年龄及其构造意义[J]. 地球化学,2014,43(3):301-316.
ZhangFeng,XuTao,FanJunjie,et al. Whole-rock Sm-Nd isochron age of Carboniferous volcanic rocks in eastern Junggar and its tectonic significance[J]. Geochimica,2014,43(3):301-316.
31 张弛. 新疆蛇绿岩某些地质特征[J]. 地质论评,1981,27(4):307-314.
ZhangChi. Some geological features of the ophiolites in Xinjiang[J]. Geological Review,1981,27(4):307-314.
32 蔡文俊,李春昱. 新疆东准噶尔北缘板块构造初步研究[C]//中国地质科学院文集.北京:中国地质学会,1983.
CaiWenjun,LiChunyu. Preliminary study in plate tectonics of Northern East Junngar in Xinjiang[C]//Bulletin of the Chinese Academy of Geological Science.Beijing:Geological Society of China,1983.
33 方爱民,王世刚,张俊敏,等. 新疆北部卡拉麦里蛇绿岩中辉长岩的锆石U-Pb年龄及其构造意义[J]. 地质科学,2015,50(1):140-154.
FangAimin,WangShigang,ZhangJunmin,et al. The U-Pb ages of zircons from the gabbro in the Kalamaili ophiolite,North Xinjiang and its tectonic significances[J]. Chinese Journal of Geology,2015,50(1):140-154.
34 李亚萍,李锦轶,孙桂华,等. 新疆东准噶尔早泥盆世早期花岗岩的确定及其地质意义[J]. 地质通报,2009,28(12):1885-1893.
LiYaping,LiJinyi,SunGuihua,et al. Determination of the Early Devonian granite in East Junggar,Xinjiang, China and its geological implications[J]. Geological Bulletin of China,2009,28(12):1885-1893.
35 郭丽爽,张锐,刘玉琳,等. 新疆东准噶尔铜华岭中酸性侵入体锆石U-Pb年代学研究[J]. 北京大学学报(自然科学版),2009,45(5):819-824.
GuoLishuang,ZhangRui,LiuYulin,et al. Zircon U-Pb age of Tonghualing intermediate-acid intrusive rocks,Eastern Junggar,Xinjiang[J]. Acta Scientiarum Naturalium Universitatis Pekinensis,2009,45(5):819-824.
36 张永,梁广林,屈迅,等. 东准噶尔琼河坝岛弧早古生代岩浆活动的锆石U-Pb年龄和Hf同位素证据[J]. 岩石学报,2010,26(8):2389-2398.
ZhangYong,LiangGuanglin,QuXun, et al. Evidence of U-Pb age and Hf isotope of zircons for Early Paleozoic magmatism in the Qiongheba arc,east Junggar[J]. Acta Petrologica Sinica,2010,26(8):2389-2398.
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[4] 路明福, 扈守全. 厚大破碎矿体回采技术的对比研究[J]. J4, 2010, 18(4): 62 -64 .
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[8] 张燕, 汤倩. 剪切带型金矿研究进展——以云南哀牢山金矿带为例[J]. J4, 2011, 19(1): 11 -15 .
[9] 于清军, 于清源, 路仁江, 孙建, 黄山, 刘吉兴. 浅孔留矿与中深孔爆破联合回采复杂矿体技术研究[J]. J4, 2011, 19(1): 49 -50 .
[10] 白复锌, 王善功, 安智海. 地下矿山开采三维可视化系统在鑫汇金矿的应用[J]. J4, 2011, 19(1): 55 -57 .