Late Paleozoic Metamorphic Complex of Precambrian Metamorphic Basement from Eastern Alxa Block: New Evidence from Zircon LA-ICP-MS U-Pb Dating of Boluositanmiao Complex
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摘要: 波罗斯坦庙杂岩是东阿拉善地块典型的中-高级变质杂岩之一，它的深入研究对进一步认识阿拉善地块起源、形成与演化过程具有十分重要的科学意义.通过对波罗斯坦庙杂岩中石英闪长质片麻岩、斜长角闪岩与花岗伟晶岩的野外观察、岩石学与锆石U-Pb定年发现，波罗斯坦庙杂岩中石英闪长质片麻岩、斜长角闪岩与花岗伟晶岩的岩浆锆石加权平均年龄分别为284±2 Ma、278±3 Ma，276±2 Ma、271±3 Ma与242±7 Ma，该组年龄被解释为其原岩成岩时代.石英闪长质片麻岩与斜长角闪岩中变质锆石加权平均年龄分别为274±6 Ma、272±5 Ma与269±3 Ma、268±2 Ma，代表它们遭受了晚古生代变质作用的时间.综合以上分析与前人研究资料，初步认为以往曾被认为是新太古代-古元古代的波罗斯坦庙杂岩，实际上可能是一个古元古代-晚古生代中-高级变质杂岩，并遭受了280~260 Ma角闪岩相变质作用，指示它们曾被卷入到中亚造山带晚古生代造山作用过程.Abstract: The Boluositanmiao complex is a typical intermediate to high-grade metamorphic complex in the Alxa block, which is significant for better understanding of the origin, formation and evolution of Alxa block. In this paper, it presents a detailed study on the field geological observation, petrology and zircon U-Pb dating of the quartz dioritic gneisses, amphibolites and granitic pegmatites of the Boluositanmiao complex, and the results indicate that the magmatic zircons from the quartz dioritic gneisses, amphibolites and granitic pegmatites record the mean ages of 284±2 Ma and 278±3 Ma, 276±2 Ma and 271±3 Ma, and 242±7 Ma, respectively, which is interpreted as the protolith timing of the complex in our study, rather than Neoachean-Paleoproterozoic as suggested in previous studies.Moreover, the metamorphic zircons from the quartz dioritic gneisses and amphibolites also record the mean ages of 274±6 Ma and 272±5 Ma, and 269±3 Ma and 268±2 Ma, respectively, which is interpreted as the Late Paleozoic metamorphic timing of the complex.In conclusion, it is proposed that the Boluositanmiao complex mainly consists of the Paleoproterozoic-Late Paleozoic geological bodies, rather than Neoarchean-Paleoproterozoic rocks. Besides, they have also undergone 280-260 Ma amphibolite-facies metamorphism, indicating that the complex could be related to the Late Paleozoic orogenesis of the central Asian orogenic belt.
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Key words:
- eastern Alxa block /
- Boluositanmiao complex /
- Late Paleozoic /
- zircon U-Pb dating /
- petrology
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图 1 阿拉善地块东部二叠纪岩浆岩时空分布地质简图
据史兴俊等(2016)修改.数据来源见附表 1，年龄后的数字与附表 1中文献序号相对应
Fig. 1. Simplified geological map of the eastern Alax block showing tempo-spatial distribution of the Permian magmatic rocks reported
图 2 阿拉善地块东部诺尔公-红古尔玉林构造带地质略图
据耿元生和周喜文(2012)修改.1.中-新生界；2.新元古代浅变质岩系；3.古元古代-中元古代阿拉善岩群；4.古元古代巴彦乌拉山岩组；5.新太古代叠布斯格岩群；6.波罗斯坦庙花岗质片麻岩杂岩；7.毕及尔台石英闪长质片麻岩杂岩；8.古生代花岗岩；9.走滑断层；10.研究区
Fig. 2. Simplified geological map of the Nuoergong-Honggueryulin tectonic belt in the eastern Alax area and location of the study area
图 3 波罗斯坦庙杂岩野外地质剖面及采样位置
Fig. 3. Geological cross sections across the Boluositanmiao complex showing the geological relationships between the different metamorphic and magmatic units and sample locations
图 4 波罗斯坦庙杂岩野外露头照片
a.黑云母花岗岩侵入石英闪长质片麻岩中，而黑云母花岗岩又被花岗质伟晶岩所侵入；b.花岗质伟晶岩和黑云母花岗岩侵入石英闪长质片麻岩；c.花岗质伟晶岩侵入石英闪长质片麻岩；d.斜长角闪岩呈透镜状产于石英闪长质片麻岩中，花岗质伟晶岩同时穿切二者；e.灰黑色石英闪长质片麻岩；f.黑色块状斜长角闪岩
Fig. 4. Photographs of field occurrences of the the Boluositanmiao complex
图 5 波罗斯坦庙杂岩典型岩石显微结构照片
a~b.石英闪长质片麻岩中典型矿物组合：角闪石+黑云母+斜长石+石英；c~d.石英闪长质片麻岩中石榴子石变斑晶内部细粒石英，以及基质中斜长石和黑云母.Amph.角闪石; Pl.斜长石; Bt.黑云母; Qz.石英; Grt.石榴子石
Fig. 5. Representative photomicrographs of Boluositanmiao complex showing index mineral assemblage
图 6 波罗斯坦庙杂岩典型岩石显微结构照片
a~b.斜长角闪岩中典型矿物组合：角闪石+斜长石+黑云母；c~d.花岗伟晶岩中典型矿物组合：钾长石+石英；e~f.黑云母花岗岩中代表性矿物组合：黑云母+斜长石+石英+钾长石.Amph.角闪石; Pl.斜长石; Bt.黑云母; Kfs.钾长石; Qz.石英
Fig. 6. Representative photomicrographs of Boluositanmiao complex showing index mineral assemblage
图 7 石英闪长质片麻岩中锆石的阴极发光图像与206Pb/238U年龄
Fig. 7. CL images and 206Pb/238U ages of zircons from quartz dioritic gneisses
图 8 斜长角闪岩中锆石的阴极发光图像与206Pb/238U年龄
Fig. 8. CL images and 206Pb/238U ages of zircons from amphibolites
图 9 花岗伟晶岩样品中锆石的阴极发光图像(a)及锆石U-Pb谐和图(b)
Fig. 9. CL images (a) and U-Pb concordia diagram (b) of zircons from granitic pegmatite
图 10 石英闪长质片麻岩锆石U-Pb谐和图
Fig. 10. U-Pb concordia diagrams of zircons from quartz dioritic gneisses
图 11 斜长角闪岩锆石207Pb/235U-206Pb/238U谐和图
Fig. 11. U-Pb concordia diagrams of zircons from amphibolites
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