Zircon U-Pb Age and Hf Isotope of Paleoproterozoic Pelitic Granulites at Weihai, Sulu Orogen: Implications for Tectonic Affinity
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摘要: 威海地区出露古元古代泥质麻粒岩，其构造属性仍存在争议.泥质麻粒岩以透镜体的形式出露在花岗质片麻岩中，透镜体从核部到边部的岩性逐渐变化：未变形的粗粒泥质麻粒岩、面理化的细粒泥质麻粒岩、石榴黑云片麻岩和混合岩化麻粒岩.粗粒泥质麻粒岩，粗粒斑状变晶结构，块状构造；细粒泥质麻粒岩，细粒斑状变晶结构，面理发育；石榴黑云片麻岩，斑状变晶结构，片麻状构造，上述3种岩石的主要矿物组合均为石榴子石+黑云母+斜长石（反条纹长石）+石英+矽线石；混合岩，条带状构造，暗色残余体主要矿物组合为石榴子石+斜长石+黑云母+石英+矽线石，浅色体矿物组合为石英+斜长石+钾长石.所有样品均有金红石、锆石和独居石等副矿物.粗粒泥质麻粒岩中的锆石颗粒均为浑圆近等粒，具有典型的麻粒岩相变质锆石的特征：锆石CL图像为均一的云雾状或补丁状结构，低的Th/U比值（0.01~0.30），强烈的Ce正异常和Eu负异常，HREE的亏损及高的Hf/Y比值（19~537）.利用锆石Ti温度计获得的变质温度为788~892℃（加权平均值为837±24℃）.锆石U-Pb定年获得上交点年龄为1 863±18 Ma，206Pb/238U加权平均年龄为1 832±23 Ma.εHf（t）值为-3.4~-4.9（加权平均值为-4.23±0.35），相应的两阶段模式年龄（TDM2）为2 716±107 Ma~2 807±93 Ma（加权平均值为2 767±44 Ma）.细粒泥质麻粒岩中的锆石也具有麻粒岩相锆石的CL和微量元素特征，Ti含量温度计获得的变质温度为804~909℃（加权平均值为845±23℃），锆石U-Pb上交点年龄为1 823±14 Ma，谐和206Pb/238U年龄加权平均值为1 812±13 Ma，εHf（t）为-3.7~-5.7（加权平均值为-4.67±0.37），TDM2为2 705±133 Ma~2 826±116 Ma（加权平均值为2 766±46 Ma）.石榴黑云片麻岩中的锆石也具有麻粒岩相变质锆石的CL和微量元素特征，锆石Ti含量计算变质温度为785~923℃（加权平均值为820±32℃），锆石U-Pb上交点年龄为1 807±22 Ma，εHf（t）为-4.5~-9.0（加权平均值为-6.07±0.48），TDM2为2 742±90 Ma~3 020±92 Ma（加权平均值为2 839±41 Ma）.混合岩中的锆石大部分具有核-边结构.根据Ti含量温度计获得的混合岩中麻粒岩相变质锆石核的变质温度为754~875℃（加权平均值为818±30℃），U-Pb上交点年龄为1 822±19 Ma，εHf（t）值为-4.3~-6.3（加权平均值为-5.47±0.35），TDM2为2 742±82 Ma~2 864±91 Ma（加权平均值为2 814±43 Ma）.可见，麻粒岩、石榴黑云片麻岩和混合岩经历了相同的麻粒岩相峰期变质作用（~1.8 Ga），具有相同的原岩属性，即晚太古代（2.7~2.8 Ga）的地壳物质.麻粒岩透镜体从核部到边部岩性的变化，可能受到晚三叠纪碰撞造山作用的不同程度改造.因此，威海超高压地体中出露的泥质麻粒岩透镜体，在构造亲属性上可能属于华北克拉通地壳物质，成因上可能与哥伦比亚超大陆的演化有关，在三叠纪大陆俯冲碰撞过程中卷入造山带.Abstract: Paleoproterozoic pelitic granulites have been reported in Weihai region, the tectonic affinity of which is still under controversy. The pelitic granulite occur as a lens in the granitic gneisses and the lithologies of the lens gradually changes from the core to the margin, from undeformed coarse-grained granulite, foliated fine-grained granulite, garnet-biotite-gneiss to migmatized granulite. The coarse-grained pelitic granulite exhibits coarse-grained porphyroblastic texture. The fine-grained pelitic granulite shows a weakly foliated layer with a fine-grained porphyroblastic texture. The garnet-biotite-gneiss displays porphyroblastic texture. The three samples described above mainly comprise of garnet + biotite + plagioclase (antiperthite) + quartz + sillimanite. The migmatite is made up of melanosomes and leucosomes, in which the former mainly consists of garnet + plagioclase + biotite + quartz + sillimanite and the latter has mineral assemblage of quartz + plagioclase + K-feldpsar. All of the four samples contain the accessory mineral assemblage of rutile + zircon + monazite. Zircons from the coarse-grained pelitic granulite are round or elliptical in shape and show homogenous cloudy zoning or patchy zoning in internal structure, and they have low Th/U ratios (0.01-0.30, mostly < 0.1), flat HREE patterns with positive Ce and negative Eu anomalies and high Hf/Y ratios (19-537, mostly > 100). These characteristics are consistent with the granulite-facies zircon growth. Ti-in-zircon thermometers give temperature of 788-892℃ (mean=837±24℃). These metamorphic zircons yield an upper intercept age of 1 863±18 Ma and a concordant 206Pb/238U age of 1 832±23 Ma, εHf(t) values ranging from -3.4 to -4.9 (mean=-4.23±0.35) and corresponding TDM2are between 2 716±107 Ma and 2 807±93 Ma (mean=2 767±44 Ma). The morphology and trace element characteristics of the zircon grains from fine-grained pelitic granulite also suggest a typical granulite-facies metamorphic zircon. The calculated metamorphic temperature is 804-909℃ (mean=845±23℃). Metamorphic zircons define an upper intercept age of 1 823±14 Ma with a tight cluster concordant 206Pb/238U age of 1 812±13 Ma. The εHf(t) values of them range from -3.7 to -5.7 (mean=-4.67±0.37). Calculated TDM2 are from 2 705±133 Ma to 2 826±116 Ma (mean=2 766±46 Ma). Zircon grains from the garnet-biotite-gneiss also grew under granulite-facies condition according to the CL and trace element features. The metamorphic temperature calculated based on the Ti contents in zircon is from 785℃ to 923℃ (mean=820±32℃). U-Pb dating of zircons gives a discordant upper intercept age of 1 807±22 Ma. The εHf(t) values range from -4.5 to -9.0 (mean=-6.07±0.48). TDM2 range from 2 742±90 Ma to 3 020±92 Ma (mean=2839±41 Ma). Most of the zircons from the migmatite exhibit a core-rim texture comprising of granulite-facies metamorphic core and a narrow anatectic rim. The metamorphic cores give temperature ranging from 754 ℃ to 875℃ (mean=818±30℃) and yield an upper intercept age of 1 822±19 Ma. The εHf(t) values are of -4.3 to -6.3 (mean=-5.47±0.35) and corresponding TDM2 are between 2 742±82 Ma and 2 864±91 Ma (mean=2 814±43 Ma). In conclusion, the pelitic granulite, garnet-biotite-gneiss and migmatite have experienced the same granulite-facies metamorphism at about~1.8 Ga and they share a common protolith which was derived from Neoarchean (2.7-2.8 Ga) crust. The changed lithologies from core to the margin of the pelitic granulite lens may be caused by the collisional orogeny during the late Triassic. Thus, the pelitic granulites in Weihai region have the tectonic affinity to NCC and formed when involved in the evolution of supercontinent Columbia, then they incorporated into the Sulu ultrahigh-pressure metamorphic belt during the collision between the Yangtze and the North China cratons and subsequently exhumed in Triassic.
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Key words:
- pelitic granulite /
- Paleoproterozoic /
- zircon /
- tectonic affinity /
- Sulu orogen /
- geochemistry /
- geochronology
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图 1 苏鲁造山带地质简图(a)和威海地区采样位置(b)
图a据Xiang et al. (2014)修改; 图b据Xu et al. (2019)修改
Fig. 1. Geological sketch map of Sulu orogen (a) and sample location in the Weihai area (b)
图 2 泥质麻粒岩透镜体野外露头及采样点(a)和采集的样品照片(b~e)
Fig. 2. Field outcrop and sample sites of the pelitic granulite lens (a) and the specimen photographs of pelitic granulite, garnet-biotite-gneiss and migmatite (b-e)
图 3 样品显微照片
图a~d为未变形的粗粒泥质麻粒岩（17WH-1）; 图e、f为面理化的细粒泥质麻粒岩（17WH-2）; 图g~i为石榴黑云片麻岩（17WH-3）; 图j~l为混合岩（17WH-5）; a. 石榴子石变斑晶中锆石、独居石包裹体及裂隙中黑云母和夕线石，基质中矽线石；b.变斑晶石榴子石中金红石、独居石、石英包裹体及金红石出溶体；c.放射状集合体黑云母及退变为钛铁矿的金红石；d.反条纹长石；e.黑云母与纤维状矽线石；f.石榴子石残余，具有定向性的黑云母；g、h、k.具有强定向性的黑云母和纤维状矽线石；i、l.定向拉长的石英及定向的矽线石；j.石榴子石变斑晶中锆石、独居石、石英和黑云母矿物包裹体. 矿物代号：Gt.石榴子石；Bt.黑云母；Qz.石英；Pl.斜长石；Atp.反条纹长石；Sil.矽线石；Rt.金红石；Kf.钾长石；Zrc.锆石；Mnz.独居石；Ilm.钛铁矿；Melt.熔体
Fig. 3. Photomicrographs of the samples
图 4 代表性锆石CL图像、U-Pb年龄及Hf同位素分析结果
红色圆圈为U-Pb年龄和微量元素分析点及对应的206Pb/238U年龄（Ma），黄色圆圈代表锆石Hf同位素分析点及对应的εHf(t)值
Fig. 4. The CL images of representative zircon grains with 206Pb/238U ages and initial Hf isotope ratios
图 6 样品锆石球粒陨石标准化稀土元素配分模式图（标准化值据Sun and McDonough, 1989）
Fig. 6. Chondrite-normalized REE patterns of zircons in samples from Weihai (values from Sun and McDonough, 1989)
图 7 样品锆石U-Pb年龄谐和图
Fig. 7. Zircon U-Pb concordia diagrams with weighted mean 206Pb/238U ages of the samples
图 8 样品锆石分析点年龄和基于锆石Ti含量温度计(Ferry and Watson, 2007)计算的变质温度图解
括号内数值为所有分析点的平均年龄和平均温度
Fig. 8. Zircon 206Pb/238U age spots and corresponding temperature which is calculated based upon Ti concentration in zircon by using the Ti-in-zircon thermometer (Ferry and Watson, 2007)
图 9 样品中锆石εHf(t)值频率直方图及加权平均值
Fig. 9. Histograms of zircon εHf(t) values and corresponding weighted mean values for samples
图 10 样品中锆石二阶段Hf模式年龄(TDM2)直方图及其加权平均值
Fig. 10. Histograms of zircon two-stage Hf model ages (TDM2) with weighted mean values for samples
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