中天山卡瓦布拉克杂岩带中闪长岩的锆石U-Pb年龄及Hf同位素特征

doi:10.13278/j.cnki.jjuese.201506112

摘要/Abstract

摘要：

卡瓦布拉克杂岩带出露于中天山地块东段卡瓦布拉克阿克塔格地区,沿卡瓦布拉克断裂呈东西向展布。笔者选择构成该杂岩带的中基性岩石主体闪长岩,开展了LA-ICP-MS锆石U-Pb年代学和LA-MC-ICP-MS锆石Hf同位素研究。结果表明:闪长岩中锆石呈自形半自形,发育典型的岩浆锆石振荡生长环带,Th/U值较高(均大于0.40),且Th、U含量呈现较好的正相关关系,为典型的岩浆成因锆石;这些锆石的²⁰⁶Pb/²³⁸U年龄加权平均值为(375±1) Ma,MSWD=0.081,属晚泥盆世,可代表其结晶年龄;锆石具有较均一的Hf同位素组成,初始比值为0.282 655~0.282 747、ε_Hf(t)值为4.0~7.2,其对应的亏损地幔模式年龄为714~842 Ma。结合区域地质资料认为,卡瓦布拉克杂岩带中的闪长岩由亏损岩石圈地幔发生部分熔融而形成。

关键词: 中天山, 卡瓦布拉克, 闪长岩, 锆石U-Pb年龄, Hf同位素

Abstract:

Kawabulak complex is distributed within Kawabulak-Aktagh area in the east section of Central Tianshan block, and extended nearly latitudinally along the Kawabulak fault. We present zircon LA-ICP-MS U-Pb chronology and LA-MC-ICP-MS Hf isotopes analyses of diorites that comprise the main parts of the intermediate and basic rocks of the complex. The zircons of diorites are mainly euhedral and hypidiomorphic texture with clear rings and high Th/U ratios(>0.40). The Th and U contents show a well positive correlation. This indicates that the zircons are typically from magma. The results show that the diorites intruded during the Late Devonian period with the ²⁰⁶Pb/²³⁸U weighted average age of 375±1 Ma (MSWD=0.081). Zircon Hf analyses show a relatively homogeneous isotopic composition; the initial Hf values fall in between 0.282 655-0.282 747 and positive ε_Hf(t) values of +4.0-+7.2 with a depleted mantle mode age (from 714 to 842 Ma). Combining with previous studies, we suggest that the diorites from Kawabulak complex were formed through a partial melting of depleted lithospheric mantle.

Key words: Central Tianshan, Kawabulak, diorite, zircon U-Pb dating, Hf isotopes

中图分类号:

P588.12

尼加提·阿布都逊, 木合塔尔·扎日, 吴兆宁. 中天山卡瓦布拉克杂岩带中闪长岩的锆石U-Pb年龄及Hf同位素特征[J]. 吉林大学学报(地球科学版), 2015, 45(6): 1702-1712.

Nijat Abdursul, Muhtar Zari, Wu Zhaoning. Zircon U-Pb Isotopic Chronology and Hf Isotopes of Diorites from Kawabulak Complex,Central Tianshan[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(6): 1702-1712.

参考文献

[1] 孙桂华,李锦轶,王德贵,等. 东天山阿其克库都克断裂南侧花岗岩和花岗闪长岩锆石SHRIMP U-Pb测年及其地质意义[J]. 地质通报, 2006, 25(8): 945-952. Sun Guihua, Li Jinyi, Wang Degui, et al. Zircon SHRIMP U-Pb Ages of Granite and Granodiorite at the South Side of the Aqqikkuduk Fault, East Tianshan, Xinjiang, China, and Its Tectonic Implications[J]. Geological Bulletin of China, 2006, 25(8): 945-952.

[2] 董丽霞. 新疆东天山原卡瓦布拉克群的解体及重新厘定[J]. 新疆地质, 2005, 23(1): 19-22. Dong Lixia. The Split and Rearranged of Original Kawabulake Group of East Tianshan in Xinjiang[J]. Xinjiang Geology, 2005, 23(1): 19-22.

[3] 彭明兴,钟春根,左琼华,等. 东天山卡瓦布拉克地区片麻状花岗岩形成时代及地质意义[J]. 新疆地质, 2012, 30(1): 12-18. Peng Mingxing, Zhong Chungen, Zuo Qionghua, et al. The Formation Age and Their Geological Significance of Gneissose Granites Neighbouring Kawabulake Area[J]. Xinjiang Geology, 2012, 30(1): 12-18.

[4] 田少亭,彭明兴,张雄华,等. 中天山卡瓦布拉克地区中元古代卡瓦布拉克群硅质岩成因[J]. 新疆地质, 2012, 30(4): 309-403. Tian Shaoting, Peng Mingxing, Zhang Xionghua, et al. The Origin of Siliceous Rock in Kawabulake Group of Mesoproterozoic in Zhongtianshan of Xinjiang[J]. Xinjiang Geology, 2012, 30(4): 309-403.

[5] 李锦轶,张进,杨天南,等. 北亚造山区南部及其毗邻地区地壳构造分区与构造演化[J]. 吉林大学学报:地球科学版, 2009, 39(4): 584-605. Li Jinyi, Zhang Jin, Yang Tiannan, et al. Crustal Tectonic Division and Evolution of the Southern Part of the North Asian Orogenic Region and Its Adjacent Areas[J]. Journal of Jilin University: Earth Science Edition, 2009, 39(4): 584-605.

[6] Jackson S E, Pearson N J. The Application of Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry in Situ U-Pb Zircon Geochronology[J]. Chemical Geology, 2004, 211: 47-69.

[7] Ludwig K. User's Manual for Isoplot/EX Version 3.00 A Geochronological Toolkit for Microsoft Excel Brkeley Geochronology Center[J]. Special Publication, 2003, 4: 1-70.

[8] Andersen T. Correction of Common Lead in U-Pb Analyses that do not Report ²⁰⁴Pb[J]. Chemical Geolgoy, 2003, 192: 59-79.

[9] 侯可军,李延河,邹天人,等. LA-MC-ICP-MS锆石Hf同位素的分析方法及地质应用[J]. 岩石学报, 2007, 23(10): 2595-2604. Hou Kejun, Li Yanhe, Zou Tianren, et al. Laser Ablation-MC-ICP-MS Technique for Hf Isotope Micronalysis of Zircon and Its Geological Applications[J]. Acta Petrologica Sinica, 2007, 23(10): 2595-2604.

[10] Wu F Y, Yang Y H, Xie L W, et al. Hf Isotopic Compisitions of the Standard Zircons and Baddeleyites Used in U-Pb Geochronology[J]. Chemical Geology, 2006, 234: 105-126.

[11] Scherer E E, Cameron K L, Blicher-Toft J. Lu-Hf Garnet Geochronology: Closure Temperature Relative to the Sm-Nd System and the Effects of Trace Mineral Inclusions[J]. Geochimica et Cosmochimica Acta, 2000, 64: 3413-3432.

[12] Corfu F, Hanchar J M, Hoskin P W O, et al. Atlas of Zircon Textures[J]. Rev Miner Grochem, 2003, 53: 469-500.

[13] 吴福元,李献华,郑永飞,等. Lu-Hf同位素体系及其岩石学应用[J]. 岩石学报, 2007, 23(2): 185-220. Wu Fuyuan, Li Xianhua, Zheng Yongfei, et al. Lu-Hf Isotopic Systematics and Their Application in Petrology[J]. Acta Petrologica Sinica, 2007, 23(2): 180-220.

[14] Su B X, Qin K Z, Sakyi P A, et al. U-Pb Ages and Hf-O Isotopes of Zircons from Late Paleozoic Mafic-Ultramafic Units in the Southern Central Asian Orogenic Belt: Tectonic Implications and Evidence for an Early-Permian Mantle Plume[J]. Gondwana Research, 2011, 20: 516-531.

[15] 周长勇,葛文春,吴福元,等. 大兴安岭北段塔河辉长岩的岩石学特征及其构造意义[J]. 吉林大学学报:地球科学版, 2005, 35(2):143-150. Zhou Changyong, Ge Wenchun, Wu Fuyuan, et al. Petrological Characteristics and Tectonic Implications of the Tahe Gabbro in the Northern Part of the Great Xing'an Rang[J]. Journal of Jilin University: Earth Science Edition, 2005, 35(2): 143-150.

[16] Su B X, Qin K Z, Sun H, et al. Subduction-Induced Mantle Heterogeneity Beneath Eastern Tianshan and Beishan: Insights from Nd-Sr-Hf-O Isotopic Mapping of Late Paleozoic Mafic-Ultramafic Complexes[J]. Lithos, 2012, 134-135: 41-51.

[17] 夏昭德,姜常义,凌锦兰. 新疆笔架山早二叠世火山岩带岩石成因:来自岩石学、地球化学及同位素年代学的制约[J]. 吉林大学学报:地球科学版, 2014, 44(3): 817-833. Xia Zhaode, Jiang Changyi, Ling Jinlan. Petrogenesis of Early Permian Bijiashan Volcanic Rocks in Beishan Area, Xinjiang, NW China: Evidence from Petrology, Geochemistry and Isotopic Geochronology[J]. Journal of Jilin University: Earth Science Edition, 2014, 44(3): 817-833.

[18] Huang Z Y, Long X P, Kroner A, et al. Geochemistry, Zircon U-Pb Ages and Lu-Hf Isotopes of Early Paleozoic Plutons in the Northwestern Chinese Tianshan: Petrogenesis and Geological Implications[J]. Lithos, 2013(182/183): 48-66.

[19] Tang D M, Qin K Z, Li C, et al. Zircon Dating, Hf-Sr-Nd-Os Isotopes and PGE Geochemistry of the Tianyu Sulfide-Bearing Mafic-Ultramafic Intrusion in the Central Asian Orogenic Belt, NW China[J]. Lithos, 2011(126): 84-98.

[20] 李锦轶,何国琦,徐新,等. 新疆北部及邻区地壳构造格架及其形成过程的初步探讨[J]. 地质学报, 2006, 80(1): 148-168. Li Jinyi, He Guoqi, Xu Xin, et al. Crustal Tectonic Framework of Northern Xinjiang and Adjacent Regions and Its Formation[J]. Acta Geologica Sinica, 2006, 80(1): 148-168.

[21] Xiao W J, Windley B F, Badarch G, et al. Palaeozoic Accretionary and Convergent Tectonics of the Sou-thern Altaids: Implications for the Crustal Growth of Central Asia[J]. Journal of the Geological Society, 2004, 161: 339-342.

[22] 高俊,钱青,龙灵利,等. 西天山的增生造山过程[J]. 地质通报, 2009, 28(12): 1804-1816. Gao Jun, Qian Qing, Long Lingli, et al. Accretionary Orogenic Process of Western Tianshan, China[J]. Geological Bulletin of China, 2009, 28(12): 1804-1816.

[23] Shi Y R, Jian P, Kroner A, et al. Zircon Ages and Hf Isotopic Compositions of Plutonic Rocks from the Central Tianshan (Xinjiang, Northwest China) and Their Significance for Early to Mid-Palaeozoic Crustal Evolution[J]. International Geology Review, 2014, 56: 1413-1434.

[24] 顾连兴,张遵忠,吴昌志,等. 关于东天山花岗岩与陆壳垂向增生的若干认识[J]. 岩石学报, 2006, 22(5): 1103-1120. Gu Lianxing, Zhang Zunzhong, Wu Changzhi, et al. Some Problems on Granites and Vertical Growth of the Continental Crust in the Eastern Tianshan Mountains, NW China[J]. Acta Petrologica Sinica, 2006, 22(5): 1103-1120.

[25] 胡远清,廖群安,施文翔,等. 中天山路白山一带晚石炭世I型和A型花岗岩组合的厘定及其意义[J]. 地质科技情报, 2009, 28(3): 10-18. Hu Yuanqing, Liao Qun'an, Shi Wenxiang, et al. Determination and the Geological Significances of the Late Carboniferous I-Type and A-Type Granites from Middle Tianshan Block, East Tianshan District, NW China[J]. Geological Science and Technology Information, 2009, 28(3): 10-18.

[26] Dong Y P,Zhang G W,Neubauer F,et al.Syn-and Post-Collisional Granitoids in the Central Tianshan Orogen: Geochemistry, Geochronology and Implications for Tectonic Evolution[J]. Gondwana Research, 2011, 20: 568-581.

[27] 朱志新,李锦轶,董连慧,等. 新疆西天山古生代侵入岩的地质特征及构造意义[J]. 地学前缘, 2011, 18(2): 170-179. Zhu Zhixin, Li Jinyi, Dong Lianhui, et al. Geological Characteristics and Tectonic Significance of Paleozoic Intrusive Rocks in Western Tianshan of Xinjiang Province[J]. Earth Science Frontiers, 2011, 18(2): 170-179.

[28] Long L L, Gao J, Klemd R, et al. Geochemical and Geochronological Studies of Granitoid Rocks from the Western Tianshan Orogen: Implications for Continental Growth in the Southwestern Central Asian Orogenic Belt[J]. Lithos, 2011(126): 321-340.

[29] 杨天南,李锦轶,孙桂华,等. 中天山早泥盆世陆弧: 来自花岗质糜棱岩地球化学及SHRIMP-U/Pb定年的证据[J]. 岩石学报, 2006, 22(1): 41-48. Yang Tiannan, Li Jinyi, Sun Guihua, et al. Earlier Devonian Active Continental Arc in Central Tian-shan: Evidence of Geochemieal Analysis and Zicron SHRIMP Dating on Mylonitizd Granitic Rock[J]. Acta Petrologica Sinica, 2006 22(1): 41-48.

[30] 杨天南,王小平. 新疆库米什早泥盆世侵入岩时代、地球化学及大地构造意义[J]. 岩石矿物学杂志, 2006, 25(5): 401-411. Yang Tiannan, Wang Xiaoping. Geochronology, Petrochemistry and Tectonic Implications of Early Devonian Plutons in Kumux Area, Xinjiang[J]. Acta Petrologica at Mineralogica, 2006, 25(5): 401-411.

[31] 雷如雄,吴昌志,屈迅,等. 中天山天湖东铁钼矿含矿片麻状花岗岩年代学、地球化学和锆石Hf同位素:对中天山古生代构造演化的启示[J]. 吉林大学学报:地球科学版, 2014, 44(5): 1541-1552. Lei Ruxiong, Wu Changzhi, Qu Xun, et al. Geochronology, Geochemistry and Zircon Hf Isotope Compisitions of the Ore-Bearing Gneiss Granite of the Tianhudong Iron-Molybdenum Ore Deposit in the Central Tianshan, West China: Implications for the Early Paleozoic Tectonic Evolution of Central Tianshan[J]. Journal of Jilin University: Earth Science Edition, 2014, 44(5):1541-1552.

[32] 马中平,夏林圻,徐学义,等. 南天山北部志留系巴音布鲁克组火山-侵入杂岩的形成环境及构造意义[J]. 吉林大学学报:地球科学版, 2006, 36(5): 736-743. Ma Zhongping, Xia Linqi, Xu Xueyi, et al. The Tectonic Setting and Implication of Volcanic-Magmatic Complex from the Upper-Silurian Bayinbuluke Formation, Southern Tianshan[J]. Journal of Jilin University: Earth Science Edition, 2006, 36(5): 736-743.

[33] 曹锐,木合塔尔·扎日,陈斌,等.东天山板块缝合带石炭纪火山岩的元素和Sr-Nd同位素地球化学特征及其大地构造意义[J]. 吉林大学学报:地球科学版, 2012, 42(2): 400-408. Cao Rui, Muhtar Zari, Chen Bin, et al. Geochemistry and Sr-Nd Isotopic Characteristics of the Carboniferous Volcanic Rocks from the Eastern Tianshan Suture Zone and Tectonic Implications[J]. Journal of Jilin University: Earth Science Edition, 2012, 42(2): 400-408.

[34] 王润三,王焰,李惠民,等. 南天山榆树沟高压麻粒岩地体锆石U-Pb定年及其地质意义[J]. 地球化学, 1998, 27(6): 517-522. Wang Runsan, Wang Yan, Li Huimin, et al. Zircon U-Pb Age and Its Geological Significance of High-Pressure Terrance of Granulite Facies in Yushougou Area, Southern Tianshan Mouantain[J]. Geochemica, 1998, 27(6): 517-522.

[35] 王润三,周鼎武,王焰,等. 南天山榆树沟高压麻粒岩地体多期变质定年研究[J]. 岩石学报, 2003, 19(3): 452-460. Wang Runsan, Zhou Dingwu, Wang Yan, et al. Geochronology for the Multiple-Stage Metamorphism of High-Pressure Terrane of Granulite Facies from Yushugou Area, South Tianshan[J]. Acta Petrologica Sinica, 2003, 19(3): 452-460.

[36] 刘斌,钱一雄. 东天山三条高压变质带地质特征和流体作用[J]. 岩石学报, 2003, 19(2): 283-296. Liu Bin, Qian Yixiong. The Geologic Characteristics and Fluid Evolution in the Three High-Pressure Metamorphic Belts of Eastern Tianshan[J]. Acta Petrologica Sinica, 2003, 19(2): 283-296.

[37] Ma X X, Shu L S, Meert J G, et al. The Paleozoic Evolution of Central Tianshan: Geochemical and Geochronological Evidence[J]. Gondwana Research, 2014, 25: 797-819.

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