Zircon U-Pb Dating of Early Paleozoic Adakites from Nantinghe Ophiolitic Mélange in Changning-Menglian Suture Zone and Its Geological Implications
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摘要: 前人在昌宁-孟连缝合带获得了大量的晚古生代岩浆活动与沉积地层的记录，但是早古生代的相关记录十分稀少，大大限制了对昌宁-孟连缝合带早古生代演化过程的理解.对南汀河地区早古生代英云闪长岩的锆石U-Pb年龄、全岩地球化学特征开展研究，并探讨其岩石成因，揭示早古生代(原)特提斯演化过程.通过LA-ICPMS锆石U-Pb定年，获得英云闪长岩206Pb/238U加权平均年龄为454.1±2.7 Ma、443.2±2.4 Ma，代表岩浆结晶时代.地球化学分析显示，南汀河英云闪长岩SiO2含量为63.41%~68.57%，K2O含量为1.31%~2.17%，同时具有富Na(Na2O=4.11%~5.07%)贫Mg(MgO=0.98%~1.39%)的特点.REE配分曲线呈现出轻稀土富集、重稀土亏损的特征，大离子亲石元素Sr、Ba等富集，高场强元素Nb、Ta、Ti亏损，与岛弧岩浆的特征相吻合；指示岩浆来源于俯冲板片的部分熔融，在岩浆上升过程中受到了俯冲沉积物的混染，形成于与原特提斯洋俯冲有关的弧火山岩环境，进一步指示早古生代原特提斯洋在454~443 Ma就已经发生了俯冲消减作用.南汀河蛇绿岩与羌塘地区龙木错-双湖缝合带桃形湖等蛇绿岩形成时代一致、地球化学性质相似，由此认为昌宁-孟连缝合带与龙木错-双湖缝合带一起代表了一个统一的古特提斯洋壳的残余.Abstract: A large number of records of magmatic activities and sedimentary strata in the Late Paleozoic have been obtained in the Changning-Menglian suture zone,but the records of Early Paleozoic are very rare,which greatly limits understanding of the Early Paleozoic evolution process in this area. In this paper,the zircon U-Pb age and geochemical characteristics of the Early Paleozoic tonalite are reported in the Nantinghe area,and its petrogenesis is discussed to reveal the evolution process of the Early Paleozoic Tethys. LA-ICPMS zircon U-Pb dating shows that the weighted mean 206Pb/238U ages are 454.1±2.7 Ma and 443.2±2.4 Ma for tonalite,representing the crystallization age of magmatic rocks. Geochemical analyses of the tonalite show that its SiO2 content is 63.41%-68.57% and the K2O content is 1.31%-2.17%,and it is rich in Na (Na2O=4.11%-5.07%) and poor in Mg (MgO=0.98%-1.39%). The REE distribution curve shows the enrichment of LREE and the depletion of HREE,large ion lithophile elements Sr,Ba enrichment,high field strength elements Nb,Ta,Ti depletion,which is consistent with the characteristics of island arc magma,indicating that they were derived from the partial melting of subduction oceanic slab and was contaminated by subduction sediments in the magma rising process,and formed in the arc volcanic environment related to the subduction of the original Tethys ocean,further indicating that the subduction of the proto-Tethys Ocean occurred in 454-443 Ma. The chronology and geochemsitry characteristics of the Nantinghe ophiolite in Changning-Menglian suture zone can be well correlated with the Taoxing Lake ophiolite in the Longmuco-Shuanghu suture zone of Qiangtang area. Thus,it is suggested that both the Changning-Menglian and Longmuco-Shuanghu sutures probably represent the original of a unified paleo-Tethys oceanic crust.
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Key words:
- adakite /
- Early Paleozoic /
- Changning-Menglian suture zone /
- Longmuco-Shuanghu suture zone /
- Tethyan /
- geochemistry /
- geochronology
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图 1 青藏高原构造格架简图(a)、西南三江南段构造简图(b)和昌宁-孟连缝合带南汀河蛇绿混杂岩带地质图(c)
图a、b据王保弟等(2018)修改；图c据云南省地质调查院, 2017, 中华人民共和国1:5万香竹林、勐勇、勐撒、懂过、耿马县、安雅、勐库7幅区域地质调查报告.图a：KL.阿尼玛卿-昆仑结合带；GL.甘孜-理塘结合带；JS.金沙江结合带；AL.哀牢山结合带；NL.北澜沧江结合带；SL.南澜沧江结合带；LS.龙木错-双湖结合带；CM.昌宁-孟连结合带；BN.班公湖-怒江结合带；YL.印度-雅鲁藏布江结合带.图b：II1.中咱-中甸地块；II2.哀牢山结合带；II3.江达-德钦-维西-绿春陆缘岩浆弧；II4.昌都-思茅地块；II5.景谷岩浆弧；II6.南澜沧江结合带；II7.临沧岩浆弧；II8.昌宁-孟连结合带；II9.保山地块；II10.璐西-三台山结合带；II11.腾冲岩浆弧；II12.拉萨-察隅岩浆弧
Fig. 1. Tectonic framework of the Tibetan Plateau (a), tectonic sketch map of the southern segment of Sanjiang tectonic belt (b) and the geological map of the Nantinghe ophiolitic mélanges zone in the Changning-Menglian suture zone (c)
图 2 昌宁-孟连缝合带南汀河英云闪长岩野外露头
Fig. 2. Field outcrop of the Nantinghe tonalite in the Changning-Menglian suture zone
图 3 南汀河蛇绿混杂岩带英云闪长岩锆石阴极发光图像与U-Pb同位素分析点位
Fig. 3. Cathodoluminescence image of zircon with U-Pb analyzed spots from tonalite in the Nantinghe ophiolitic mélange zone
图 4 南汀河蛇绿混杂岩带英云闪长岩锆石U-Pb年龄谐和图
Fig. 4. U-Pb concordia diagram of zircons from the tonalite in the Nantinghe ophiolitic mélange zone
图 5 南汀河蛇绿混杂岩带英云闪长岩岩浆/火成岩系统TAS分类图解
底图据Middlemost (1994)；牛井山英云闪长岩王冬兵等(2016)
Fig. 5. Total alkali silica (TAS) classification diagram of magma/igneous rock system of tonalite in the Nantinghe ophiolitic mélange zone
图 6 南汀河蛇绿混杂岩带英云闪长岩球粒陨石标准化稀土元素配分模式(a)和原始地幔标准化微量元素蛛网图(b)
标准化值据Sun and McDonough(1989)；牛井山英云闪长岩王冬兵等(2016)
Fig. 6. Chondrite-normalized REE pattern (a) and primitive mantle-normalized spider diagram (b) of tonalite in the Nantinghe ophiolitic mélange zone
图 7 南汀河蛇绿混杂岩带英云闪长岩Sr/Y-Y图解
底图据Defant and Drummond(1990)；牛井山英云闪长岩王冬兵等(2016)
Fig. 7. Sr/Y vs. Y diagram for tonalite in the Nantinghe ophiolitic mélange zone
图 8 南汀河英云闪长岩Mg#-SiO2判别图解
底图据Jiang et al.(2014)；牛井山英云闪长岩王冬兵等(2016)
Fig. 8. Mg# vs. SiO2 diagram for tonalite in the Nantinghe ophiolitic mélange zone
图 9 南汀河英云闪长岩Rb-(Y+Nb)(a)和Nb-Y(b)判别图解
底图据Pearce et al.(1984)；牛井山英云闪长岩王冬兵等(2016)
Fig. 9. Rb vs. (Y+Nb) (a) and Nb vs. Y (b) diagrams for tonalite in the Nantinghe ophiolitic mélanges zone
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