LA-ICP-MS Zircon U-Pb Age of Late Triassic Intrusive Rocks in Bayinhudousen Area, East Kunlun and Its Tectonic Significance
-
摘要: 巴音呼都森中酸性花岗岩位于东昆仑西段祁漫塔格山，处于北昆仑岩浆弧中，岩石类型由灰白色中细粒花岗闪长岩、灰白色中细粒二长花岗岩、浅肉红色细中粒似斑状二长花岗岩和浅灰肉红色二长花岗斑岩组成。笔者分别选取该地区多登似斑状二长花岗岩和景忍二长花岗斑岩进行LA-ICP-MS锆石微区定年，获得时间为（217±2）Ma、（212±1）Ma，表明该岩体成岩年龄为晚三叠世。岩石地球化学特征具有高SiO2含量（67.01%~76.61%）、K2O含量（3.47%~5.52%）、Na2O含量（1.55%~4.52%），而贫MgO（0.12%~1.37%），低TiO2（0.06%~0.84%）、P2O5（0.01%~0.36%）的特征，稀土元素特征具弱的Eu负异常（δEu值=0.17~0.72），A/CNK均小于1.1，岩石系列属过铝质的高钾钙碱性。综合分析认为该期花岗岩形成于后造山伸展环境。该型花岗岩的确定证明了祁漫塔格地区晚三叠世之前碰撞造山作用的存在。
-
关键词:
- 东昆仑 /
- 晚三叠世中酸性侵入岩 /
- LA-ICP-MS锆石微区定年 /
- 构造意义
Abstract: The Bayinhudousen intrusive rocks are located at Qimantage Mountain in the western part of East Kunlun Mountains, and they are occurred in the North Kunlun magmatic arc.They are composed of gray white fine granite granodiorite, gray medium-fine grained monzonitic granite, flesh red fine-medium grained porphyritic monzogranite and light grey monzonitic granite porphyry.In this paper, the LA-ICP-MS Zircon U-Pb method has been used to date the samples of porphyritic monzogranite in Duodeng area and monzonitic granite porphyry in Jingren area.The obtained ages are (217.0±2.0)Ma and (212.0±1.0)Ma, respectively, suggesting that these plutons were formed in Late Triassic epoch.The geochemical results show that these rocks have high SiO2 (67.01%~76.61%), K20 (3.47%~5.52%)and Na2O (1.55%~4.52%)contents, but have low MgO (0.12%~1.37%), TiO2 (0.06%~0.84%)and P2O5 (0.01%~0.36%)contents.Their rare earth elements have weak negative Eu anomaly (δEu values are 0.17~0.72), and their A/CNK ratios are less than 1.1, showing the features of peraluminous high-k calc-alkaline series.After analyzing the characteristics mentioned above, it's believed that these granites were formed in post orogenic extensional environment.Therefore, the existence of Bayinhudousen late triassic intrusive rocks has proved that the collision orogenesis was existed in Qimantage tectonic belt before Late Triassic epoch. -
-
张雪亭,杨生德,杨站君,等.青海省区域地质概论[M].北京:地质出版社,2007. ZHANG Xueting,YANG Shengde,YANG Zhanjun, et al.An introduction to regional geology of Qinghai Province[M].Beijing:Geological Publshing House,2007.
陈丹玲,刘良,车自成,等.祁漫塔格印支期铝质A型花岗岩的确定及初步研究[J].地球化学,2001,30(6):540-546. CHEN Danling,LIU Liang,CHE Zicheng, et al.Determination and preliminary study of Indosinian aluminous A-type granites in the Qimantag area, southeastern Xinjiang[J].Geochimica,2001,30(6):540-546.
王秉璋,罗照华,李怀毅,等,东昆仑祁漫塔格走廊域晚古生代-早中生代侵入岩岩石组合及时空格架[J].中国地质,2009,36(4):769-782. WANG Bingzhang,LUO Zhaohua,LI Huaiyi, et al.On the petrotectonic assemblages and the temporal and spatial framework of the late Paleozoic-early Mesozoic intrusions in the domain across Qimantage mountains, east Kunlun belt[J].Geology in China, 2009,36(4):769-782.
郭通珍,刘荣,陈发彬,等.青海乌兰乌珠尔斑状正长花岗岩LA-MC-ICPMS锆石U-Pb定年及其地质意义[J].地质通报,2011,30(8):1203-1211. GUO Tongzhen, LIU Rong, CHEN Fabin, et al.LA-MC-ICPMS zircon U-Pb dating of Wulanwuzhuer porphyritic syenite granite in the Qimantag Mountain of Qinghai and its geological significance[J].Geological Bulletin of China, 2011, 30(8):1203-1211.
陈功,裴先治,李佐臣,等.东昆仑东段巴隆地区朝火鹿陶勒盖花岗闪长岩体锆石U-Pb 年龄、地球化学及其地质意义[J] 地质通报,2016,35(12):1990-2005. CHENG Gong,PEI Xianzhi,LI Zuocheng,et al.Zircon U-Pb geochronology, geochemical characteristics and geological significance of Chaohuolutaolegai granodiorite in Balong area, East Kunlun Mountains[J].Geological Bulletin of China, 2016,35(12)1990-2005.
常有英,李建放,张军,等.青海那陵郭勒河东晚三叠世形成环境及年代学研究[J].西北地质,2009,42(1):57-65. CHANG Youying,LI Jianfang,ZHANG Jun, et al.Study of Environment and Chronology of Late Triassic Intrusive Rocks in East Nalinggele River of Qinghai[J].Northwesrern Geology,2009, 46(2):57-65.
袁万明,莫宣学,喻学惠,等.东昆仑印支期区域构造背景的的花岗岩记录[J].地质论评,2000,203-211. YUAN Wanming,MO Xuanxue,YU Xuehui, et al.Geological records of the regional tectonic environments during the Indo Chinese period within granites in the East-Kunlun[J].Geological Reviews,2000,46 (2):203-211(in Chinese with English abstract).
袁万明,莫宣学,喻学惠,等.东昆仑热液金成矿带及其找矿方向[J].地质与勘探,2000,36(5):20-23. YUAN Wanming,MO Xuan xue,YU Xue hui, et al.Gold Mettallogenic Belts and Prospecting direction in Eastern Kunlun Arear[J].Geology and Prospecting,2000,36(5):20-23.
潘维良,刘春涌,景宝盛.新疆维宝铅锌矿床地质特征及成因[J].新疆有色金属, 2005(增刊):2-4. PAN Weiliang,lIU chunyong,JING Baosheng.Geological characteristics and genesis of Weibao Pb-Zn deposit in Xinjiang[J].Xinjiang Nonferrous Metals,2005(supl):2-4.
李月隆,张芬英,周晓中.青海东昆仑造山带祁漫塔格地区铁钴金多金属矿找矿前景分析[J].甘肃冶金,2007,29(2):34-36. LI Yuelong, ZHANG Fenying, ZHOU Xiaozhong.On Prospecting Foreground of MultimetalsM ine in Q imantage of the Estern Kunlun Mountains Orogenic Zone[J].Gansu Metallurgy, 2007,29(2):34-36.
赵一鸣,丰成友,李大新,等.青海西部祁漫塔格地区主要矽卡岩型铁金属矿床成因地质背景和矿化蚀变特征[J].矿床地质,2013,32(1):1-19. ZHAO Yiming,FENG Chengyou,LI Daxin, et al.Metallogenic setting and mineralization-alteration characteristics of major skarn Fe-polymetallic deposits in Qimantag area,western Qinghai Province[J].Mineral Deposits, 2013,32(1):1-19.
宋忠宝,贾群子,张占玉,等.东昆仑祁漫塔格地区野马泉铁铜矿床地质特征及成因探讨[J].西北地质,2010,43(4):209-217. SONG Zhongbao,JIA qunzi,ZHANG Zhanyu, et al.Study on Geological Feature and Origin of Yemaquan Fe-Cu Deposit in Qimantage Area,Eastern Kunlun[J].Northwesrern Geology, 2010,43(4):209-217.
王松, 丰成友, 李世金, 等.青海祁漫塔格卡尔却卡铜多金属矿区花岗闪长岩锆石SHRIMP U-Pb 测年及其地质意义[J].中国地质,2009, 36(1):74-84. WANG Song,FENG Chengyou,Ll Shijin, et al.Zircon SHRIMP U-Pb dating of granodiorite in the Kaerqueka Polymetallic ore deposit,Qimantage Mountain,Qinghai Province,and its geological implications[J].Geology in China,2009, 36(1):74-84.
李世金, 孙丰月, 丰成友, 等.青海东昆仑鸭子沟多金属矿的成矿年代学研究[J].地质学报, 2008, 82(7):949-955. LI Shijin,SUN Fengyue,FENG Chengyou,et al.Geochronological Study on Yazigou Polymetallic Deposit in Eastern Kunlun,Qinghai Province[J].Acta Geologica Sinica, 2008, 82(7):949-955.
刘云华, 莫宣学, 喻学惠, 等.东昆仑野马地区景忍花岗岩锆石SHRIMP U-Pb 定年及其地质意义[J].岩石学报, 2006, 22(10):2457-2463. LIU Yunhua,MO Xuanxue,YU Xuehui, et al.Zircon SHRIMP U-Pb dating of the Jingren granite, Yemaquan region of the east kunlun and its geological significance[J].Acta Petrologica Sinica,2006,22(10):2457-2463.
丰成友, 李东生, 屈文俊, 等.青海祁漫塔格索拉吉尔矽卡岩型铜钼矿床辉钼矿铼-锇同位素定年及其地质意义[J].岩矿测试,2009, 28(3):223-227. FENG Cheng you,LI Dongsheng,QU Wenjun,et al.Re-Os Isotopic Dating of Molybdenite from the Suolajier Skarn-type Copper-Molybdenum Deposit of Qimantage Mountain in Qinghai Province and Its Geological Significance[J].Rock and Mineral Analysis,2009,28(3):223-227.
张爱奎, 刘光莲, 莫宣学, 等.青海祁漫塔格晚古生代-早中生代侵入岩构造背景与成矿关系[J].西北地质, 2012, 45(1):9-19. ZHANG Aikui, LIU Guanglian,MO Xuanxue, et al.Relationship Between Tectonic Settings and Metallo Genesis of Late Paleozoic-Early Mesozoic Intrusive Rock in Qimantage, Qinghai Province[J].Northwesrern Geology, 2012, 45(1):9-19.
谌宏伟,罗照华,莫宣学,等.东昆仑喀雅克登塔格杂岩体的SHRIMP 年龄及其地质意义[J].岩石矿物学杂志,2006,25(1):25-32. CHEN Hongwei,LUO Zhaohua,MO Xuanxue, et al.HRIMP ages of Kayakedengtage complex in the East Kunlun mountains and their geological implication[J].Acta Petrologica et Mineralogica,2006,25(1):25-32.
罗照华,柯珊,曹永清,等.东昆仑印支晚期幔源岩浆活动[J].地质通报,2002,21(6):292-297. LUO Zhaohua,KE Shan,CAO Yongqing,et al.Late Indosinian mantle-derived magmatism in the East Kunlun[J].Geological Bulletin of China,2002,21(6):292-297.
青海省地质矿产局.青海省岩石地层(全国地层多重划分对比研究)[M].武汉:中国地质大学出版社,1997,94-95. Burdau of Geology and Mineral Resources of Qinghai Provicne.Rock strata in Qinghai province(Multiple stratigraphic division and correlation study in china)[M].Wuhan:China University of Geosciences Press,1997,94-95.
PEARCEJ A and CANN J R.Tectonic setting of basic volcanic rocks determined using trace element analyses[J].Earth and Planetary Science Letters, 1973,19:290-300.
PEARCE J.A.and NORRY M.J.Petrogenetic implications of Ti, Zr, Y and Nb variations in volcanic rocks[J].Contrib Mineral Petrol, 1979,69:33-47.
PEARCEJ.A.Role of the sub-continental lithosphere in magma genesis at active continental margins[M].HAWKESWORTH C J, NORRY M J, eds.Continental basalts and mantle xenoliths.Nantwich:Shiva, 1983,230-249.
G N.Chemical subdivision of the A-type granitoids:Petro genetic and tectonic implications[J].Geology, 1992,20:641-644.
计量
- 文章访问数: 2330
- HTML全文浏览量: 0
- PDF下载量: 2499
下载:
