西天山加满特一带早二叠世乌郎组双峰式火山岩锆石U-Pb年代学及Hf同位素组成
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摘要
西天山加满特一带基性与酸性火山岩在时空上紧密伴生,其SiO_2含量分别为41.89%～52.75%和74.79%～78.51%,具有明显的Daly间断,属于典型的双峰式火山岩组合,其中的基性单元属于碱性系列,酸性单元属于钙碱性系列。对流纹岩进行LA-ICP-MS锆石U-Pb法测年和Hf同位素分析,获得其形成年龄为(294.2±0.8) Ma,属于早二叠世,其εHf(t)为较高的正值(8.0～17.1),二阶段Hf模式年龄TDM2(Hf)平均值为468 Ma。通过对加满特一带双峰式火山岩的地球化学特征和成因类型进行探讨,表明其不属于同源岩浆演化成因,其中玄武岩是富集石榴石地幔源区发生了尖晶石相橄榄岩向石榴石相橄榄岩过渡相部分熔融的产物,流纹岩是亏损地幔源底侵新生地壳部分熔融的产物,二者形成于板内伸展环境。结合区域构造演化,认为西天山在早二叠世已经进入伸展构造背景。
The basic and acidic volcanic rocks with SiO_2 contents of 41.89%-52.75% and 74.79%-78.51%, respectively, are closely associated in time and space in the area of Jiamante, western Tianshan Mountains. These volcanic rock associations show distinct"Daly gap", thus can be ascribed to the typical bimodal volcanic assemblage. The basic units can be grouped into alkaline series,whereas the acidic units are calc-alkaline series. LA-ICP-MS zircon U-Pb dating and Hf isotopic analysis for rhyolites show that their formation age is(294.2±0.8) Ma, indicating that they were formed in Early Permian. The volcanic rocks have positive εHf(t) values(8.0-17.1), and young two-stage model ages with an average of 468 Ma. By integration of the geochemical characteristics and genetic types, it is shown that the bimodal volcanic rocks in the Jiamante area can not be produced by differentiation from the same magma chamber.Rather, they were likely originated from different sources. Among them, the basalt was originated from partial melting of the enriched garnet peridotite induced by the phase transition from spinel peridotite to garnet peridotite, and rhyolite is generated by partial melting of juvenile crust resulted from underplating of depleted mantle. Both the basic and acidic volcanic rocks were formed in an intraplate extension environment. In combination with analysis of the regional tectonic evolution, it is suggested that the western Tianshan Mountains were entered an extensional tectonic setting since the Early Permian.
The basic and acidic volcanic rocks with SiO_2 contents of 41.89%-52.75% and 74.79%-78.51%, respectively, are closely associated in time and space in the area of Jiamante, western Tianshan Mountains. These volcanic rock associations show distinct"Daly gap", thus can be ascribed to the typical bimodal volcanic assemblage. The basic units can be grouped into alkaline series,whereas the acidic units are calc-alkaline series. LA-ICP-MS zircon U-Pb dating and Hf isotopic analysis for rhyolites show that their formation age is(294.2±0.8) Ma, indicating that they were formed in Early Permian. The volcanic rocks have positive εHf(t) values(8.0-17.1), and young two-stage model ages with an average of 468 Ma. By integration of the geochemical characteristics and genetic types, it is shown that the bimodal volcanic rocks in the Jiamante area can not be produced by differentiation from the same magma chamber.Rather, they were likely originated from different sources. Among them, the basalt was originated from partial melting of the enriched garnet peridotite induced by the phase transition from spinel peridotite to garnet peridotite, and rhyolite is generated by partial melting of juvenile crust resulted from underplating of depleted mantle. Both the basic and acidic volcanic rocks were formed in an intraplate extension environment. In combination with analysis of the regional tectonic evolution, it is suggested that the western Tianshan Mountains were entered an extensional tectonic setting since the Early Permian.
引文
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王岚,杨理勤,王亚平,等.2012.锆石LA-ICP-MS原位微区U-Pb定年及微量元素的同时测定[J].地球学报,(5):763-772.
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夏林圻,夏祖春,徐学义,等.2004.天山石炭纪大火成岩省与地幔柱[J].地质通报,23(z2):903-910.
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夏林圻,夏祖春,徐学义,等.2008.天山及邻区石炭纪一早二叠世裂谷火山岩岩石成因[J].西北地质,41(4):1-68.
贠杰,孙吉明,朱小辉,等.2017.新疆博乐哈夏林场一带下二叠统乌郎组火山岩地球化学特征及地质意义[J].地质科技情报,(3):71-81.
赵乐强,秦峰,贾凡建,等.2017.准噶尔盆地南缘晚古生代双峰式火山岩成因机制及其地球动力学背景[J].岩石矿物学杂志,36(2):148-162.
赵军,张作衡,张贺,等.2013.新疆阿吾拉勒山西段下二叠统陆相火山岩岩石地球化学特征、成因及构造背景[J].地质学报,87(4):525-541.
郑海飞,陈斌,孙樯,等.2003.高压下玄武岩浆的不混溶及其对双峰式火山岩的成因意义[J].岩石学报,19(4):745-751.
Andersen T.2002.Correction of common lead in U-Pb analyses that do not report 204Pb[J].Chemical Geology,192(1):59-79.
Brewer T S,Ahall K I,Menuge J F,et al.2004.Mesoproterozoic bimodal volcanism in SW Norway,evidence for recurring pre-Sveconorwegian continental margin tectonism[J].Precambrian Research,134(3-4):249-273.
Chen X,Shu L,Santosh M,et al.2013.Island are-type bimodal magmatism in the eastern Tianshan Belt,Northwest China:Geochemistry,zircon U-Pb geochronology and implications for the Paleozoic crustal evolution in Central Asia[J].Lithos,168-169(3):48-66.
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Doe B R,Leeman W P,Christiansen R L,et al.1982.Lead and strontium isotopes and related trace elements as genetic tracers in the UpperCenozoic rhyolite-basalt association of the Yellowstone Plateau Volcanic Field[J].Journal of Geophysical Research:Solid Earth,87(B6):4785-4806.
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Gao J,Long L,Klemd R,et al.2009.Tectonic evolution of the South Tianshan orogen and adjacent regions,NW China:geochemical and age constraints of granitoid rocks[J].International Journal of Earth Sciences,98(6):1221.
Gao J,Wang X S, Klemd R,et al.2015.Record of assembly and breakup of Rodinia in the Southwestern Altaids:evidence from Neoproterozoic magmatism in the Chinese Western Tianshan Orogen[J].Journal of Asian Earth Sciences,113:173-193.
Hochstaedter A G,Gill J B,Kusakabe M,et al.1990.Volcanism in the Sumisu Rift,I.Major element,volatile,and stable isotope geochemistry[J].Earth and Planetary Science Letters,100(1-3):179-194.
Hildreth W.1981.Gradients in silicic magma chambers:Implications for lithospheric magmatism[J].Journal of Geophysical Research:Solid Earth,86(B11):10153-10192.
Le Bas M J,Le Maitre R W,Streckeisen A,et al.1986.A c.hemical classification of volcanic rocks based on the total alkali-silica diagram[J].Journal of Petrology,27(3):745-750.
Ludwig K R.1999.Using isoplot/EX,version 2,a geolocronolgical toolkit for microsoft excel[J].Berkeley Geochronological Center Special Publication,47:151-181.
MacDonald R.1987.Quaternary peralkaline silicic rocks and caldera volcanoes of Kenya[J].Geological Society London Special Publications,30(1):313-333.
Meschede M.1986.A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram[J].Chemical Geology,56(3):207-218.
Miller C, Schuster R,Klotzli U,et al.1999.Post-collisional potassic and ultrapotassic magmatism in SW Tibet:Geochemical and Sr-Nd-Pb-O isotopic constraints for mantle source characteristics and petrogenesis[J].Journal of Petrology,40(9):699-715.
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