The Discovery of Earliest Middle Triassic C-Type Adakite from Langshan Area, Inner Mongolia and Its Tectonic Implications
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摘要: 狼山构造带位于索伦缝合带南西，华北北缘及中亚造山带南缘的结合位置，是研究中亚造山带晚古生代-早中生代构造-岩浆演化及地球动力学背景的重要场所.在该地区新识别出中三叠世早期具有埃达克岩特征的扎拉山岩体，该岩体岩石类型主要为花岗闪长岩及二长花岗岩，LA-ICP-MS锆石U-Pb定年结果显示该岩体的形成时代介于244.9±1.2 Ma~244.1±2.3 Ma.地球化学特征表明，该岩体具有较高的SiO2（68.77%~72.58%）、Al2O3（14.48%~16.28%）、Sr（287×10-6~455×10-6，平均值413×10-6）含量及Sr/Y比值（46.07~95.50），较低的Y（4.07×10-6~8.01×10-6）、Yb（0.43×10-6~0.78×10-6）、Cr（5.18×10-6~8.92×10-6）、Ni（1.34×10-6~7.71×10-6）含量及Mg#值（35.54~41.64），Na2O/K2O比值为0.86~1.19，重稀土元素强烈亏损，轻重稀土元素分馏明显（26.45 <（La/Yb）N < 56.13），铕异常较弱（0.82 < δEu < 1.02），具有C型埃达克岩特征.锆石Hf同位素分析结果显示εHf（t）值介于2.5~8.9，对应的二阶模式年龄TDM2介于707~1 115 Ma，表明其源区主要为年轻地壳.结合区域地质背景，结果表明内蒙古狼山地区中三叠世早期具有C型埃达克岩特征的扎拉山岩体应为古亚洲洋闭合之后，西伯利亚板块与华北板块碰撞造山阶段的产物，为加厚的下地壳部分熔融形成.Abstract: The Langshan structural belt is located in southwest of the Solonker suture zone and as well as the junction between the northern margin of the North China Craton and southern of Central Asian orogenic belt, which is an ideal workplace to study on tectonic-magmatic evolution and geodynamics background from Late Paleozoic to Early Mesozoic. An earliest Middle Triassic pluton with Adakite characteristics was discovered in this study and was called as Zhalashan pluton. The main rock types of Zhalashan Pluton are granodiorite and monzogranite. LA-ICP-MS zircon U-Pb ages yield the formation time of Zhalashan pluton between 244.9±1.2 Ma and 244.1±2.3 Ma. Geochemical characteristics show that the Zhalashan granites are typical C-type adakite with high SiO2(68.77%-72.58%), Al2O3(14.48%-16.28%), Sr(287×10-6-455×10-6, 413×10-6 on average) content and high Sr/Y ratio (46.07-95.50), low Y(4.07×10-6-8.01×10-6), Yb(0.43×10-6-0.78×10-6), Cr(5.18×10-6-8.92×10-6), Ni(1.34×10-6-7.71×10-6) content and low Mg#(35.54-41.64), Na2O/K2O ratio between 0.86 and 1.19. In addition, it exhibits significant fractionation between LREE and HREE[26.45 < (La/Yb)N < 56.13] and is depleted in HREE with slight Eu anomaly (0.82 < δEu < 1.02). Zircon Hf isotopic data displays that εHf(t) values vary from 2.5~8.9, Hf model ages TDM2 vary from 707-1 115 Ma, indicating a juvenile crustal material. Together with regional geological background, the authors hold that the Zhalashan pluton resulted from collision between Siberia Craton and North China Craton after the closure of the Paleo-Asian Ocean which is the product of partial melting of the thickened lower crust.
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Key words:
- Langshan area /
- earliest Middle Triassic /
- adakite /
- thickened crust /
- closure of the Paleo-Asian Ocean /
- petrology
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图 1 狼山及相邻地区不同尺度区域地质简图
a.中亚造山带构造纲要图，据Şengör et al.(1993)、Jahn et al.(2004)修改；b.华北北缘晚古生代-早中生代侵入岩分布图，据Shi et al.(2014)修改；c.狼山地区地质简图，据Liu et al.(2016)，以及中国地质调查局天津地质调查中心, 2016, 内蒙古1:5万查干呼舒庙幅、楚鲁庙幅、潮格幅、哈尔木格台幅、那仁宝力格公社幅、居力格台幅区域地质矿产调查报告修改.1.中-新元古代变质沉积岩；2.新元古代变质沉积岩；3.晚古生代沉积岩及火山岩；4.中-新生代沉积岩；5.中元古代变质侵入岩；6.早古生代侵入岩；7.晚古生代镁铁质侵入岩；8.晚古生代中-酸性侵入岩；9.早中生代花岗岩；10.获各琦断裂；11.其他断裂；12.韧性剪切带；13.扎拉山岩体地质简图位置；14.前人锆石U-Pb年龄采样点；15.本文锆石U-Pb年龄采样点
Fig. 1. Different scale geological maps in Langshan and adjacent area
图 2 扎拉山岩体野外及镜下照片
a.二长花岗岩野外特征；b.二长花岗岩侵入花岗闪长岩；c.二长花岗岩镜下特征；d.花岗闪长岩镜下特征.矿物代号：Kfs.钾长石；Pl.斜长石；Qtz.石英；Bt.黑云母；Ms.白云母
Fig. 2. Field and microscope photographs for Zhalashan pluton
图 3 扎拉山岩体地质简图
1.新元古代变质沉积岩；2.中-新生代沉积岩；3.中元古代变质侵入岩；4.晚古生代中-酸性侵入岩；5.三叠纪花岗闪长岩；6.三叠纪二长花岗岩；7.断裂；8.锆石U-Pb年龄采样点；9.全岩地球化学分析采样点
Fig. 3. Simplified geological map of Zhalashan pluton
图 4 扎拉山岩体部分锆石CL图像
红色小圈代表锆石U-Pb测年位置；黄色大圈代表Hf同位素分析位置
Fig. 4. Part of CL images and analysis spot of zircons from Zhalashan pluton
图 5 扎拉山岩体花岗闪长岩及二长花岗岩锆石U-Pb测年谐和图和加权平均年龄图
Fig. 5. Zircon U-Pb condordia and weighted average age diagrams for granodiorite and monzogranite from Zhalashan pluton
图 6 扎拉山岩体岩石判别图解
a.SiO2-K2O图解，转引自(Maitre, 1989)；b.A/CNK-A/NK图解，转引自Maniar and Piccoli(1989)，乌和尔图花岗岩数据王文龙等(2017)，下文图解相同
Fig. 6. Granitiods discrimination diagrams of the Zhalashan pluton
图 7 扎拉山岩体岩石稀土元素球粒陨石标准化配分图(a)及微量元素原始地幔蛛网图(b)
Fig. 7. Chondrite-normalized REE parterns (a) and primitive-mantle normalized trace element spider diagram (b) for Zhalashan pluton
图 8 扎拉山岩体埃达克岩判别图解
图a据Defant and Drummond(1990)；图b据Martin(1986)
Fig. 8. Adakite discrimination diagram of Zhalashan pluton
图 9 扎拉山岩体花岗闪长岩εHf(t)-t图解
样品TW3306-1数据引自乌和尔图岩体，据王文龙等(2017)
Fig. 9. εHf(t)-t diagrams of Zhalashan granodiorite
图 11 扎拉山岩体SiO2-MgO(a)及SiO2-Cr图解(b)
Fig. 11. SiO2-MgO (a) and SiO2-Cr (b) diagrams of Zhalashan pluton
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