西昆仑慕士塔格—公格尔印支期侵入岩岩石与锆石地球化学特征及研究意义

doi:10.13278/j.cnki.jjuese.201505114

摘要/Abstract

摘要：

西昆仑造山带南侧的麻扎康西瓦缝合带,是古特提斯洋闭合的位置。慕士塔格—公格尔作为昆仑山的主峰,紧邻该缝合带的东北侧分布,主要岩性为花岗闪长岩和黑云母二长花岗岩。作者系统研究了两种岩性的地球化学及年代学特征,探讨了岩石成因,反演了古特提斯洋的构造演化历史。岩体岩浆锆石LA-ICP-MS U-Pb测年结果显示,花岗闪长岩和黑云母二长花岗岩的成岩年龄分别为(213.0±0.5)~(215.4±0.9)Ma和(220.6±0.5)~(222.1±0.4)Ma,是晚三叠世岩浆活动的产物。两种岩性均为高硅(w(SiO₂)>65%)、富碱(w(K₂O+Na₂O) >6%)、钙碱性-高钾钙碱性、准铝质(A/CNK< 1),富集大离子亲石元素(LILE)和轻稀土元素(LREE),亏损高场强元素(HFSE)和重稀土(HREE)。微量元素组成特征、低锆石饱和温度及高分异指数显示慕士塔格—公格尔花岗岩体为高分异I型花岗岩。岩体锆石的ε_Hf(t)值变化范围较小,为-4.46~-0.17,指示岩浆以壳源为主。综合研究表明,慕士塔格—公格尔花岗岩体可能是同碰撞造山环境下,老的下地壳受地幔热源影响部分熔融,形成的长英质壳源岩浆侵入地壳内部而冷却结晶形成。

关键词: 花岗岩, 地球化学, 锆石LA-ICP-MS年龄, Hf同位素, 古特提斯洋, 慕士塔格&mdash, 公格尔

Abstract:

Mazha-Kangxiwa suture zone (MKSZ), located to the south of the western Kunlun orogenic belt, is the location where Paleo-Tethys ocean finally closed. As the main peaks of Kunlun Mountain ranges, Muztag-Kongur granitoids closely distributed to the northeast of MKSZ and composed mainly of granodiorite and monzonitic granites. Based on the geochemical characteristics and U-Pb dating of Muztag-Kongur granitoids, we discussed the petrogenesis of granitoids and the evolution history of Paleo-Tethys ocean. The zircon LA-ICP-MS U-Pb dating results show that the forming ages of granodiorite and monzonitic granite are at (213.0±0.5)-(215.4±0.9) Ma and (220.6±0.5)-(222.1±0.4) Ma respectively, which is the result of Late Triassic magmatism activities. Muztag-Kongur granitoids contain high silicon (SiO₂>65%) and total alkali (K₂O+Na₂O>6%), and are characterized by high K calc-alkaline and metaluminous (A/CNK< 1). They are enriched in LILE and LREE and depleted of HFSE and HREE. The contents of minor elements, low zircon saturation temperature, and high differentiation index suggest that Muztag-Kongur granitoids are highly fractionated I-type granites. The zircon Hf isotopic results show a narrow range of ε_Hf(t)=-4.46--0.17, suggesting that the magmas originated mainly from lower crust. The comprehensive studies indicate that Muztag-Kongur granitoids formed likely in a syn-collisional orogenic setting where old lower crust melted partially under the heating of uprising mantle magmas. These felsic magmas intruded into crust level and formed Muztag-Kongur granitoids.

Key words: granite, geochemistry, zircon LA-ICP-MS age, Hf isotope, Paleo-Tethys ocean, Muztag-Kongur

中图分类号:

P588.12

宋樾, 王建, 刘金霖, 包真艳. 西昆仑慕士塔格—公格尔印支期侵入岩岩石与锆石地球化学特征及研究意义[J]. 吉林大学学报(地球科学版), 2015, 45(5): 1418-1435.

Song Yue, Wang Jian, Liu Jinlin, Bao Zhenyan. Chronology, Geochemistry, Hafnium Isotope Characteristics and Tectonic Implications of Muztag-Kongur Indosinian Intrusive Rocks[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(5): 1418-1435.

参考文献

[1] 任纪舜.从全球看中国大地构造:中国及邻区大地构造图简要说明[M].北京: 地质出版社, 1999:1-15. Ren Jishun.China Tectonic on Global View:The Tectonic Map of China and Adjacent Regions[M]. Beijing: Geological Publishing House, 1999:1-15.

[2] 姜春发, 王宗起, 李锦轶. 中央造山带开合构造[M]. 北京: 地质出版社, 2000:7-13. Jiang Chunfa, Wang Zongqi, Li Jinyi. Tectonics of the Central Orogenic Belt[M]. Beijing:Geology Press, 2000:7-13.

[3] 许志琴, 戚学祥, 刘福来, 等. 西昆仑康西瓦加里东期孔兹岩系及地质意义[J]. 地质学报, 2004, 78: 733-743. Xu Zhiqin, Qi Xuexiang, Liu Fulai, et al. Geological Significance of Kangxiwa Caledonian Khondalites, Western Kunlun[J]. Acta Geologica Sinica, 2004, 78: 733-743.

[4] 计文化. 西昆仑喀喇昆仑晚古生代早中生代构造格局[D]. 北京:中国地质大学, 2005: 16-106. Ji Wenhua. The Late Paleozoic-Early Mesozoic Tectonic Frame in the Western Kunlun-Karakorum Area[D]. Beijing: China University of Geosciences, 2005: 16-106.

[5] 姜耀辉,丙行健,郭坤一,等.西昆仑造山带花岗岩形成的构造环境[J].地球学报,2000,21(1): 23-25. Jiang Yaohui, Bing Xingjian, Guo Kunyi, et al. Tectonic Environments of Granitoids in the West Kunlun Orogenic Belt[J]. Acta Geoscientia Sinica, 2000, 21(1): 23-25.

[6] 李荣社, 计文化, 杨永成, 等. 昆仑山及邻区地质[M]. 北京: 地质出版社, 2008:1-5. Li Rongshe, Ji Wenhua, Yang Yongcheng, et al. Tectonic Environments of Granitoids in the West Kunlun Orogenic Belt[M]. Beijing: Geological Publishing House, 2008:1-5.

[7] 张传林, 陆松年, 于海峰, 等. 青藏高原北缘西昆仑造山带构造演化:来自锆石SHRIMP 及LA-ICP-MS测年的证据[J]. 中国科学:D 辑:地球科学, 2007, 37(2): 145-155. Zhang Chuanlin, Lu Songnian, Yu Haifeng, et al. Tectonic Evolution of the Western Kunlun Orogenic Belt in the North Edge of Tibet: Evidences from the SHRIMP and LA-ICP-MS of Zircons[J].Science in China Press: Series D: Geoscience, 2007, 37(2): 145-155.

[8] 毕华, 王中刚, 王元龙, 等. 西昆仑造山带构造-岩浆演化史[J].中国科学:D 辑:地球科学, 1999, 29(5): 398-406. Bi Hua, Wang Zhonggang, Wang Yuanlong, et al. Tectonic-Magmatic Evolution of Western Kunlun Orogenic Belt[J]. Science in China:Series D: Geoscience,1999, 29(5): 398-406.

[9] 杨文强, 刘良, 曹玉亭, 等. 西昆仑塔什库尔干印支期(高压)变质事件的确定及其构造地质意义[J]. 中国科学:地球科学, 2011, 41(8):1047-1060. Yang Wenqiang, Liu Liang, Cao Yuting, et al. Geochronological Evidence of Indosinian (High-Pressure) Metamorphic Event and Its Tectonic Significance in Taxkorgan Area of the Western Kunlun Mountains, NW China[J]. Scientia Sinica Terrae, 2010, 53: 1445-1459.

[10] 张传林, 于海峰, 王爱国, 等. 西昆仑西段三叠纪两类花岗岩年龄测定及其构造意义[J]. 地质学报, 2005, 79(5): 645-652. Zhang Chuanlin, Yu Haifeng, Wang Aiguo, et al. Dating of Triassic Granites in the Western Kunlun Mountains and Its Tectonic Significane[J]. Acta Geologica Sinica, 2005, 79(5): 645-652.

[11] Jiang Y H, Jia R Y, Liu Zheng, et al. Origin of Middle Triassic High-K Calc-Alkaline Granitoids and Their Potassic Microgranular Enclaves from the Western Kunlun Orogen, Northwest China: A Record of the Closure of Paleo-Tethys[J]. Lithos, 2013(156/157/158/159):13-30.

[12] Pan Y S. Geological Evolution of the Karakorum and Kunlun Mountains[M]. Beijing:Seismological Press, 1996.

[13] 侯可军,李延河,田有荣. LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J]. 矿床地质, 2009, 28(4): 481-492. Hou Kejun, Li Yanhe, Tian Yourong. In Situ U-Pb Zircon Dating Using Laser Ablation-Multi Ion Counting-ICP-MS[J]. Mineral Deposits, 2009, 28(4): 481-492.

[14] 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 Microsnalysis of Zircon and Its Geological Application[J]. Acta Petrologica Sinica, 2007,23(10): 2595-2604.

[15] Maitre R W,Streckeisen A,Zanettin B,et al.Igneous Rocks: A Classification and Glossary of Terms[M]. Cambridge :Cambridge University Press, 2002.

[16] Peccerillo A, Taylor S R. Geochemistry of Eocene Calcalkaline Volcanic Rocks from the Kastamonu Area, Northern Turkey[J]. Contributions to Mineralogy and Petrology, 1976, 58(1): 63-81.

[17] Wright J B. A Simple Alkalinity Ratio and Its Application to Questions of Non-Orogenic Granite Genesis[J]. Geol Mag, 1969, 106: 370-384.

[18] McDonough W F, Sun S S. The Composition of the Earth[J]. Chemical Geology, 1995, 120: 223-253.

[19] 张旗, 潘国强, 李承东, 等. 花岗岩构造环境问题:关于花岗岩研究的思考之三[J]. 岩石学报, 2007, 23(7):1683-1698. Zhang Qi, Pan Guoqiang, Li Chengdong, et al. Are Discrimination Diagrams Always Indicative of Correct Tectonic Settings of Granites? Some Crucial Questions on Granite Study:3[J]. Acta Petrologica Sinica, 2007, 23(7): 1683-1698.

[20] Barbarin, B. Genesis of the Two Main Types of Peraluminous Granitoids[J]. Geology, 1996, 24:295-298.

[21] Defant M J, Drummond M S. Derivation of Some Modern Arc Magmas by Melting of Young Subducted Lithosphere[J]. Nature, 1990, 347: 662-665.

[22] 吴福元, 李献华, 杨进辉, 等. 花岗岩成因研究的若干问题[J]. 岩石学报,2007, 23(6): 1218-1238. Wu Fuyuan, Li Xianhua, Yang Jinhui, et al. Discussions on the Petrogenesis of Granites[J]. Acta Petrologica Sinica, 2007,23(6): 1217-1238.

[23] Wu F Y,Jahn B M,Wilde S A,et al.Highly Fractionated I-Type Granites in NE China:1:Geochronology and Petrogenesis[J]. Lithos, 2003, 66: 241-273.

[24] 张旗, 潘国强, 李承东, 等. 花岗岩结晶分离作用问题:关于花岗岩研究的思考之二[J]. 岩石学报, 2007, 23(6): 1239-1251. Zhang Qi, Pan Guoqiang, Li Chengdong, et al. Does Fractional Crystallization Occur in Granitic Magma? Some Crucial Questions on Granite Study:2[J]. Acta Petrologica Sinica, 2007, 23(6): 1239-1251.

[25] Chappell B W,White A J R.Two Contrasting Granite Types[J]. Pacific Geology, 1974, 8:173-174.

[26] Watson E B,Harrison T M. Zircon Saturation Revisited: Temperature and Composition Effect in Avariety of Crustalmagmas Types[J]. Earth and Planetary Science Letters,1983,64: 295-304.

[27] Eby G N. The A-Type Granitoids: A Review of Their Occurrence and Chemical Characteristics and Speculations on Their Petrogenesis[J]. Lithos, 1990, 26: 115-134.

[28] Eby G N.Chemical Subdivision of the A-Type Granitoids: Petrogenetic and Tectonic Implications[J]. Geology, 1992, 20(7): 641-644.

[29] Whalen J B, Currie K L, Chappell B W. A-Type Granites: Geochemical Characteristics, Discrimination and Petrogenesis[J]. Contrib Miner Petrol,1987, 95:295-304.

[30] 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):186-220. Wu Fuyuan, Li Xianhua, Zheng Yongfei, et al. Lu-Hf Isotopic Systematics and Their Applications in Petrology[J]. Acta Petrologica Sinica, 2007, 23(2):186-220.

[31] Wu F Y, Jahn B M, Wilde S A, et al. Highly Fractionated I-Type Granites in NE China:Ⅱ: Isotopic Geochemistry and Implications for Crustal Growth in the Phanerozoic[J]. Lithos, 2003, 67: 191-204.

[32] 郑永飞, 陈仁旭,张少兵, 等. 大别山超高压榴辉岩和花岗片麻岩中锆石Lu-Hf同位素研究[J]. 岩石学报, 2007, 23(2):317-330. Zheng Yongfei, Chen Renxu, Zhang Shaobing, et al. Zircon Lu-Hf Isotope Study of Ultrahigh-Pressure Eclogite and Granitic Gneiss in the Dabie Orogeny[J]. Acta Petrologica Sinica, 2007, 23(2):317-330.

[33] Pearce J A, Harris N B W, Tindle A G. Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks[J]. Journal of Petrology, 1984, 25: 956-983.

[34] Förster H J, Tischendorf G, Trumbull R B. An Evaluation of the Rb Vs. (Y+Nb) Discrimination Diagram to Infer Tectonic Setting of Silicic Igneous Rocks[J]. Lithos, 1997, 40: 261-293.

[35] 莫宣学,潘桂棠. 从特提斯到青藏高原形成:构造-岩浆事件的约束[J].地学前缘,2006,13(6): 43-51. Mo Xuanxue, Pan Guitang. From the Tethys to the Formation of the Qinghai-Tibet Plateau:Constrained by Tectonic-Magmatic Events[J]. Earth Science Frontiers, 2006,13(6): 43-51.

相关文章 15

[1]	张强, 丁清峰, 宋凯, 程龙. 东昆仑洪水河铁矿区狼牙山组千枚岩碎屑锆石U-Pb年龄、Hf同位素及其地质意义[J]. 吉林大学学报(地球科学版), 2018, 48(4): 1085-1104.
[2]	郭春涛, 李如一, 陈树民. 塔里木盆地古城地区鹰山组白云岩稀土元素地球化学特征及成因[J]. 吉林大学学报(地球科学版), 2018, 48(4): 1121-1134.
[3]	崔亚川, 于介江, 杨万志, 张元厚, 崔策, 于介禄. 东天山觉罗塔格带黄山地区角闪辉长岩岩体的年代学、地球化学特征及岩石成因[J]. 吉林大学学报(地球科学版), 2018, 48(4): 1105-1120.
[4]	赵希林, 姜杨, 邢光福, 于胜尧, 彭银彪, 黄文成, 王存智, 靳国栋. 陈蔡早古生代俯冲增生杂岩对华夏与扬子地块拼合过程的指示意义[J]. 吉林大学学报(地球科学版), 2018, 48(4): 1135-1153.
[5]	王朝阳, 孟恩, 李壮, 李艳广, 靳梦琪. 吉东南新太古代晚期片麻岩类的时代、成因及其对早期地壳形成演化的制约[J]. 吉林大学学报(地球科学版), 2018, 48(3): 587-625.
[6]	高飞, 刘永江, 温泉波, 李伟民, 冯志强, 范文亮, 汤超. 内蒙古突泉—科尔沁右翼中旗地区中生代花岗岩锆石U-Pb年龄及其地质意义[J]. 吉林大学学报(地球科学版), 2018, 48(3): 769-783.
[7]	尹业长, 郝立波, 赵玉岩, 石厚礼, 田午, 张豫华, 陆继龙. 冀东高家店和蛇盘兔花岗岩体:年代学、地球化学及地质意义[J]. 吉林大学学报(地球科学版), 2018, 48(2): 574-586.
[8]	齐天骄, 薛春纪, 许碧霞. 新疆昭苏布合塔铜(金)矿化区花岗质岩石锆石U-Pb年龄、地球化学特征及其成因[J]. 吉林大学学报(地球科学版), 2018, 48(1): 132-144.
[9]	乔健, 栾金鹏, 许文良, 王志伟, 赵硕, 郭鹏. 佳木斯地块北部早古生代沉积建造的时代与物源:来自岩浆和碎屑锆石U-Pb年龄及Hf同位素的制约[J]. 吉林大学学报(地球科学版), 2018, 48(1): 118-131.
[10]	孙凡婷, 刘晨, 邱殿明, 鲁倩, 贺云鹏, 张铭杰. 大兴安岭东坡小奎勒河中基性侵入岩成因及地球动力学意义:锆石U-Pb年代学、元素和Hf同位素地球化学证据[J]. 吉林大学学报(地球科学版), 2018, 48(1): 145-164.
[11]	张超, 崔芳华, 张照录, 耿瑞, 宋明春. 鲁西金岭地区含矿闪长岩体成因:来自锆石U-Pb年代学和地球化学证据[J]. 吉林大学学报(地球科学版), 2017, 47(6): 1732-1745.
[12]	施珂, 张达玉, 丁宁, 王德恩, 陈雪锋. 皖南逍遥岩体的年代学、地球化学特征及其成因分析[J]. 吉林大学学报(地球科学版), 2017, 47(6): 1746-1762.
[13]	谭洪旗, 刘玉平. 滇东南猛洞岩群斜长角闪岩成因及其构造意义[J]. 吉林大学学报(地球科学版), 2017, 47(6): 1763-1783.
[14]	高红梅, 兰永伟, 周莉, 孟丽岩. 温度作用下缺陷花岗岩热损伤:以甘肃北山缺陷花岗岩为例[J]. 吉林大学学报(地球科学版), 2017, 47(6): 1795-1802.
[15]	陈治军, 任来义, 贺永红, 刘护创, 宋健. 银额盆地哈日凹陷银根组优质烃源岩地球化学特征及其形成环境[J]. 吉林大学学报(地球科学版), 2017, 47(5): 1352-1364.

Metrics

Viewed

Full text

366

HTML			PDF

Just accepted	Online first	Issue	Just accepted	Online first	Issue
0	0	0	0	0	366

From	Others	local

Times	58	308
Rate	16%	84%

Abstract

546

Just accepted	Online first	Issue

0	0	546

From	Others	local

Times	471	75
Rate	86%	14%

Cited

Web of Science	Crossref	ScienceDirect	Search for Citations in Google Scholar >>


This page requires you have already subscribed to WoS.

Shared

Discussed