Geological significance of the discovery of Late Jurassic intermediate-acidic intrusive rock in Bogeda area of East Tianshan, Xinjiang, and its U-Pb zircon age
-
摘要:
在1:5万区域地质调查的基础上,在东天山博格达石结子、菜籽沟地区,新发现了二长花岗岩、闪长岩。采用LA-ICPMS技术测得二长花岗岩和闪长岩中锆石的206Pb/238U年龄分别为154.9±1.9Ma和152.7±1.8Ma,表明岩体侵入时间为晚侏罗世。该发现证实了东天山地区存在晚侏罗世岩浆活动,为准噶尔-东天山中生代岩浆活动事件积累新的资料,对于研究东天山乃至北疆中生代构造岩浆演化具有重要意义。
-
关键词:
- 晚侏罗世 /
- LA-ICP-MS锆石U-Pb年龄 /
- 中酸性侵入岩 /
- 博格达 /
- 新疆
Abstract:On the basis of 1:50000 regional geological survey in the Bogurda region of eastern Tianshan, the authors found monzonitic granite and diorite for the first time in Shijiezi and Caizigou area. Though U-Pb dating of monzonitic granite and diorite zircon by LA-ICP-MS technology, the authors obtained the fairly exact age data of 154.9±1.9 Ma and 152.7±1.8Ma, which suggest that the intrusion occurred in Late Jurassic. These are the first dating data for Mesozoic intermediate-acid intrusive rocks in Bogurda region. These data confirmed that the eastern part of Tianshan experienced magmatic activity in Late Jurassic. The results obtained by the authors provide new data for the event of the Mesozoic magmatism in the Junggar-Eastern Tianshan region, thus having great significance for studying tectonic magmatic evolution of the Eastern Tianshan region even the whole North Xinjiang.
-
Key words:
- Late Jurassic /
- LA-ICP-MS zircon U-Pb age /
- intermediate-acid intrusive rocks /
- Bogurda /
- Xinjiang
-
-
表 1 二长花岗岩、闪长岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. U -Th - Pb composition of zircon from the monzonitic granite and diorite determined by LA - ICP-MS
分析点 Pb Th U Th/U 同位素比值 同位素年龄/Ma 10-6 207pb/206pb ±lσ 207pb/235u ±lσ 206pb/238u ±lσ 208pb/232Th ±lσ 207pb/206pb ±lσ 207pb/235u ±lσ 206pb/238u ±lσ 二长花岗岩D1084-6 1 38.5 188 378 0.50 0.0500 0.0013 0.1691 0.0039 0.0245 0.0003 0.0079 0.0002 195 32 159 3 156 2 2 34.0 192 338 0.57 0.0511 0.0016 0.1709 0.0046 0.0243 0.0003 0.0078 0.0002 245 37 160 4 155 2 3 29.8 152 287 0.53 0.0490 0.0026 0.1669 0.0081 0.0247 0.0006 0.0090 0.0005 150 69 157 7 157 4 4 65.4 279 580 0.48 0.0478 0.0023 0.1625 0.0069 0.0247 0.0005 0.0095 0.0004 87 59 153 6 157 3 5 53.4 206 530 0.39 0.0515 0.0021 0.1714 0.0062 0.0241 0.0005 0.0078 0.0004 265 49 161 5 154 3 6 26.9 108 268 0.40 0.0496 0.0044 0.1685 0.0135 0.0246 0.0010 0.0092 0.0009 177 110 158 12 157 6 7 17.5 96 173 0.55 0.0491 0.0024 0.1665 0.0074 0.0246 0.0005 0.0082 0.0004 153 66 156 6 157 3 8 48.6 257 518 0.50 0.0537 0.0035 0.1703 0.0100 0.0230 0.0007 0.0095 0.0007 358 78 160 9 146 4 9 42.1 188 391 0.48 0.0542 0.0041 0.1730 0.0117 0.0231 0.0008 0.0082 0.0007 379 90 162 10 147 5 闪长岩D1096-2 1 19.4 87 202 0.43 0.0514 0.0035 0.1691 0.0103 0.0239 0.0007 0.0082 0.0006 259 84 159 9 152 5 2 25.4 120 267 0.45 0.0515 0.0023 0.1680 0.0068 0.0236 0.0005 0.0073 0.0005 265 55 158 6 151 3 3 28.2 111 284 0.39 0.0471 0.0022 0.1608 0.0066 0.0248 0.0005 0.0081 0.0004 53 55 151 6 158 3 4 33.3 222 338 0.66 0.0510 0.0022 0.1685 0.0064 0.0240 0.0005 0.0075 0.0003 240 52 158 6 153 3 5 37.7 218 381 0.57 0.0508 0.0032 0.1689 0.0095 0.0241 0.0007 0.0077 0.0005 231 78 158 8 154 4 6 41.2 238 427 0.56 0.0518 0.0019 0.1679 0.0054 0.0235 0.0004 0.0077 0.0003 276 43 158 5 150 3 7 57.8 303 637 0.48 0.0540 0.0027 0.1674 0.0076 0.0225 0.0005 0.0085 0.0005 369 60 157 7 143 3 8 43.4 253 437 0.58 0.0518 0.0020 0.1696 0.0059 0.0237 0.0004 0.0072 0.0003 277 47 159 5 151 3 9 50.1 171 447 0.38 0.0473 0.0026 0.1603 0.0080 0.0246 0.0006 0.0111 0.0007 65 66 151 7 156 4 10 54.9 174 543 0.32 0.0482 0.0024 0.1638 0.0073 0.0247 0.0006 0.0079 0.0006 107 62 154 6 157 4 11 25.8 92 233 0.39 0.0533 0.0050 0.1700 0.0144 0.0231 0.0010 0.0088 0.0010 341 115 159 12 147 6 12 57.9 353 582 0.61 0.0493 0.0014 0.1644 0.0042 0.0242 0.0003 0.0074 0.0002 160 35 155 4 154 2 13 19.3 71 192 0.37 0.0475 0.0033 0.1616 0.0101 0.0247 0.0007 0.0077 0.0007 73 85 152 9 157 5 14 53.5 303 551 0.55 0.0462 0.0017 0.1570 0.0053 0.0246 0.0004 0.0080 0.0003 10 41 148 5 157 3 15 25.8 176 261 0.67 0.0514 0.0027 0.1682 0.0081 0.0237 0.0006 0.0081 0.0005 257 66 158 7 151 4 16 41.0 132 355 0.37 0.0484 0.0029 0.1626 0.0088 0.0243 0.0007 0.0083 0.0006 121 75 153 8 155 4 17 40.4 209 416 0.50 0.0486 0.0019 0.1638 0.0057 0.0245 0.0004 0.0074 0.0003 126 50 154 5 156 3 18 33.2 155 319 0.49 0.0487 0.0019 0.1636 0.0056 0.0244 0.0004 0.0080 0.0003 131 49 154 5 155 3 19 32.7 174 343 0.51 0.0533 0.0044 0.1714 0.0127 0.0233 0.0009 0.0098 0.0010 343 101 161 11 149 6 20 54.2 183 587 0.31 0.0544 0.0022 0.1682 0.0061 0.0224 0.0004 0.0080 0.0004 387 47 158 5 143 3 21 41.1 299 427 0.70 0.0528 0.0020 0.1706 0.0058 0.0234 0.0004 0.0071 0.0003 321 45 160 5 149 3 22 29.7 162 295 0.55 0.0486 0.0016 0.1633 0.0047 0.0244 0.0004 0.0073 0.0003 127 41 154 4 155 2 23 23.6 93 236 0.40 0.0489 0.0018 0.1640 0.0055 0.0243 0.0004 0.0078 0.0004 144 48 154 5 155 3 -
[1] Li J Y, Xiao X C, Tang Y Q, 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. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dzlp199004003
[2] 朱永峰.新疆的印支运动与成矿[J].地质通报, 2007, 26(5):510-519. doi: 10.3969/j.issn.1671-2552.2007.05.002 http://dzhtb.cgs.cn/gbc/ch/reader/view_abstract.aspx?file_no=20070585&flag=1
[3] 徐新, 陈川, 丁天府, 等.准噶尔西北缘早侏罗世玄武岩的发现及地质意义[J].新疆地质, 2008, 26(1):9-16. doi: 10.3969/j.issn.1000-8845.2008.01.003
[4] 张前锋, 胡霭琴, 张国新, 等.阿尔泰地区中、新生代岩浆活动的同位素年龄证据[J].地球化学, 1994, 23(3):269-280. doi: 10.3321/j.issn:0379-1726.1994.03.007
[5] 胡霭琴, 王中刚, 涂光炽.新疆北部地质演化及成岩成矿规律[M].北京:科学出版社, 1997:4-6, 73.
[6] 夏林圻, 夏祖春, 徐学义, 等.天山岩浆作用[M].北京:中国大地出版社, 2007:108-118.
[7] 王洪亮, 徐学义, 何世平, 等.中国天山及邻区地质图说明书[M].北京:地质出版社, 2007:35-43.
[8] 董连慧, 祁世军, 成守德.新疆地壳演化及优势矿产成矿规律研究[M].武汉:中国地质大学出版社, 2009:8.
[9] 王金荣, 李泰德, 田黎萍, 等.新疆博格达造山带晚古生代构造-岩浆演化过程:火山岩组合及地球化学证据[J].岩石学报, 2010, 26(4):1103-1115. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201004008
[10] 顾连兴, 胡受奚, 于春水, 等.博格达陆内碰撞造山带挤压-拉张构造转折期的侵入活动[J].岩石学报, 2001, 17(2):187-197. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200102002
[11] 王银喜, 顾连兴, 张遵忠, 等.博格达裂谷闭合和区域隆起的同位素年代学证据及地质意义[J].地球学报, 2005, 9(26):102-104. http://d.old.wanfangdata.com.cn/Periodical/dqxb2005z1035
[12] 张妍, 李振生, 聂峰, 等.新疆博格达山晚古生代地层的形成时代、物源及其演化:碎屑锆石U-Pb年代学证据[J].地质科学, 2015, 50(1):155-181. doi: 10.3969/j.issn.0563-5020.2015.01.010
[13] 李平, 刘伟, 朱志新, 等.博格达西段三个山石英闪长岩体地球化学特征、年代学及地质意义[J].新疆地质, 2013, 31(3):162-166. doi: 10.3969/j.issn.1000-8845.2013.03.005
[14] 王银喜, 顾连兴, 张遵忠, 等.博格达裂谷双峰式火山岩地质年代学与Nd-Sr-Pb同位素地球化学特征[J].岩石学报, 2006, 22(5):1215-1224. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200605013
[15] 王银喜, 顾连兴, 张遵忠, 等.东天山晚石炭世大石头群流纹岩Sr-Nd-Pb同位素地球化学研究[J].岩石学报, 2007, 23(7):1749-1755. doi: 10.3969/j.issn.1000-0569.2007.07.020
[16] 顾连兴, 于春水, 李宏宇, 等.博格达上大河沿岩体铷-锶同位素年龄及其地质意义[J].矿物岩石地球化学通报, 2000, 19(1):19-21. doi: 10.3969/j.issn.1007-2802.2000.01.007
[17] 舒良树, 朱文斌, 王博, 等.新疆博格达南缘后碰撞期陆内裂谷和水下滑塌构造[J].岩石学报, 2005, 21(1):25-36. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200501003
[18] 高景刚, 李文渊, 郭新成, 等.新疆博格达东缘色皮口一带辉绿岩地球化学、锆石U-Pb及地质意义[J].新疆地质, 2013, 31(2):117-123. doi: 10.3969/j.issn.1000-8845.2013.02.003
[19] Chen X J, Shu L S, Santosh M, et al. Late Paleozoic postcollisional magmatism in the eastern Tianshan belt, Northwest China:New insights from geochemistry, geochronology and petrology of bimodal volcanic rocks[J].Lithos, 2011, 127(3/4):581-598. http://www.sciencedirect.com/science/article/pii/S0024493711001678
[20] Chen X J, Shu L S, Santosh M et al.Island arc-type bimodal magmatism in the eastern Tianshan belt, Northwest China:Geochemistry, ziron U-Pb geochronology and implications for the Paleozoic crustal evolution in central Asia[J].Lithos, 2013, 168/169:48-66. doi: 10.1016/j.lithos.2012.10.006
[21] 陈登超, 赵省民, 邓坚.新疆东部博格达山北侧石炭系碎屑锆石U-Pb定年及其地质意义[J].地质学报, 2010, 84(12):1770-1780. http://d.old.wanfangdata.com.cn/Periodical/dizhixb201012006
[22] 谭佳奕, 王淑芳, 张元元, 等.准噶尔盆地东部石炭系火山岩储层地质特征及油气意义[J].地质科学, 2010, 45(1):243-255. doi: 10.3969/j.issn.0563-5020.2010.01.020
[23] Hu Z C, Gao S, Liu Y S, et al. Signal enhancement in laser ablation ICP-MS by addition of nitrogen in the central channel gas[J]. Journal of Analytical Atomic Spectrometry, 2008, 23:1093-1101. doi: 10.1039/b804760j
[24] Liu Y S, Hu Z C, Gao S, et al. In situ analysis of major and trace elements of anhydrous mineral by LA-ICP-MS without applying an internal standard[J].Chemical Geology, 2008, 257:34-43. doi: 10.1016/j.chemgeo.2008.08.004
[25] Liu Y S, Gao S, Hu Z C, et al.Continental and oceanic crust recycling-induced mele-peridotite interactions in the TransNorth China Orogen:U-Pb dating, Hf isotopes and trace elements in zircons of mantle xenoliths[J]. Journal of Petrology, 2010, 51:537-571. doi: 10.1093/petrology/egp082
[26] 刘松柏, 窦虎, 张为民, 等.准噶尔东北缘喀拉通克地区侏罗纪粗安岩的发现及地质意义[J].地质论评, 2018, 64(6):1519-1529. http://d.old.wanfangdata.com.cn/Periodical/dzlp201806016
[27] 蔡土赐, 孙巧缡, 缪长泉, 等.新疆维吾尔自治区岩石地层[M].武汉:中国地质大学出版社, 1999:121-124.
① 陕西区域地质矿产研究院. 1: 50000 K45E003024、K46E003001、K45E004024、K46E004001幅区域地质调查报告. 2016.
② 新疆地质矿产勘查开发局第一区域地质调查大队. 1: 50000 K45E003022、K45E003023、K45E004022、K45E004023幅区域地质调查报告. 2016.
③ 新疆维吾尔自治区区域地质调查大队. 1: 200000大桥幅区域地质调查报告. 1979.
④ 新疆维吾尔自治区区域地质调查大队. 1: 200000得柳、青河幅区域地质调查报告. 1979.
⑤ 新疆地质局区域地质调查大队. 1: 200000富蕴幅区域地质调查报告. 1978.
⑥ 戴橦谟, 杨学昌.准噶尔盆地火山岩年代学岩石学及地球化学.中国科学院地球化学研究所, 1985.
⑦ 中国科学院地球化学研究所.准噶尔盆地火山岩年代学岩石学及地球化学, 准噶尔盆地形成演化及油气形成规律.中国科学院地学部, 1985.
-