Multiple Tectonothermal Events Recorded in the Early Precambrian Cuoke Complex in the Southwestern Yangtze Block, South China
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摘要: 撮科杂岩是最近在滇中地区发现的早前寒武纪基底杂岩，对深入探究扬子陆块早期演化具有重要意义.报道了4件代表性岩石样品的锆石U-Pb年代学和Hf同位素新数据.奥长花岗质片麻岩样品的结晶年龄为2 845±33 Ma，具有正的锆石εHf（t）值（1.7~4.6）和相对年轻的亏损地幔二阶段（TDM2）模式年龄（2.97~3.12 Ga），表明其形成于新生地壳的重熔.变二长花岗岩和片麻状花岗岩样品的结晶年龄分别为2 401±15 Ma和2 320±16 Ma，显示负的锆石εHf（t）值（-6.2~-0.8）和明显老的TDM2模式年龄（2.90~3.11 Ga），指示其来自古老地壳物质的重熔.斜长黑云碎粒岩的变质锆石的年龄为1 948±16 Ma，结合已有变质年龄揭示一期1.96~1.95 Ga区域变质作用.扬子陆块西南缘存在太古代结晶基底，并保留了与Nuna超大陆聚合有关的多期构造-岩浆事件的记录.Abstract: The Cuoke Complex, a newly identified Early Precambrian basement complex in central Yunnan, bears key information for the early evolution of the Yangtze Block. Here, we present zircon U-Pb geochronological and Hf isotopic data of four representative samples collected from this complex. Magmatic zircons of one trondjemitic gneiss sample yield a crystallization age of 2 845±33 Ma, with positive εHf(t) values of 1.7-4.6 and relatively young depleted mantle two stage (TDM2) model ages of 2.97-3.12 Ga, suggestive of the derivation from remelting of juvenile crust. Meta-monzogranite and gneissic granite yield ages of 2 401±15 Ma and 2 320±16 Ma respectively. They show negative zircon εHf(t) values of -6.2 to -0.8 and older TDM2 model ages of 2.90-3.11 Ga, indicating that they were formed by remelting of ancient crustal materials. Metamorphic-origin zircons of one plagioclase-biotite cataclasite sample give an age of 1 948±16 Ma. Together with available metamorphic age data, it is revealed that one episode of regional metamorphism occurred at 1.96-1.95 Ga. Our new dataset confirms the existence of Archean basement rocks in the Cuoke Complex. Moreover, multiple magmatic and metamorphic events related to the assembly of the Nuna supercontinent extensively took place in the southwestern Yangtze Block, South China.
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Key words:
- Archean /
- Paleoproterozoic /
- tectonothermal event /
- Cuoke Complex /
- Yangtze Block /
- geochronology
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图 1 滇中地区撮科杂岩地质图及采样位置
据Cui et al. (2019)修改；年龄数据引自Cui et al.(2019, 2020a, 2020b)和Liu et al.（2020）. F1.青杨断裂；F2.河底河断裂；F3.双菁断裂
Fig. 1. Geological map of the Cuoke Complex in the central Yunnan Province, showing sampling location
图 2 撮科杂岩代表性样品的镜下显微照片
a.奥长花岗质片麻岩(DA842-TW1); b.变二长花岗岩(17CK15-TW2); c.片麻状花岗岩(DA238-TW1); d.斜长黑云碎粒岩(PMA04-TW4). Qtz.石英; Pl.斜长石; Kfs.钾长石; Bt.黑云母; Mus.白云母; Ser.绢云母; Epi.绿帘石
Fig. 2. Micrographs of representative samples from the Cuoke Complex
图 3 撮科杂岩代表性样品的锆石CL图像及测点位置
实线和虚线圆圈分别代表U-Pb和Lu-Hf分析点
Fig. 3. Zircon CL images and analytical spots of representative samples from the Cuoke Complex
图 4 撮科杂岩代表性样品的锆石Th/U值与207Pb/206Pb年龄的相关性
Fig. 4. Relation of zircon Th/U ratios and 207Pb/206Pb ages for representative samples from the Cuoke Complex
图 5 撮科杂岩代表性样品的锆石U-Pb年龄谐和图
Fig. 5. Zircon U-Pb concordia diagrams of representative samples from the Cuoke Complex
图 6 撮科杂岩代表性样品的锆石εHf(t)值和TDM2模式年龄的频率分布图
Fig. 6. Frequency histograms of zircon εHf(t) values and TDM2 model ages of representative samples from the Cuoke Complex
图 7 撮科杂岩太古代-古元古代变花岗质岩的锆石Hf同位素组成
部分数据引自Cui et al.(2019, 2020a, 2020b)
Fig. 7. Zircon Hf isotope compositions of Archean-Paleoproterozoic meta-granitoids from the Cuoke Complex
图 8 撮科杂岩样品的锆石U-Pb年龄累计概率图
绿色和黄色方框分别代表结晶年龄和变质年龄, 年龄数据及来源见表 1
Fig. 8. Cumulative probability plot of zircon U-Pb ages of samples from the Cuoke Complex
表 1 扬子陆块西南缘早前寒武纪撮科杂岩的岩浆岩锆石U-Pb年龄
Table 1. Zircon U-Pb ages of magmatic rocks from Early Precambrian Cuoke Complex in the southwestern Yangtze Block
样品 岩性 结晶年龄（Ma） 变质年龄（Ma） U-Pb定年方法 数据来源 CK13-01 变二长花岗岩 2 359±16 LA-ICP-MS Cui et al., 2019 CK14-06 变二长花岗岩 2 363±16 LA-ICP-MS Cui et al., 2019 CK01-01 变二长花岗岩 2 218±9 SHRIMP Cui et al., 2020a CK02-07 变二长花岗岩 2 350±6 SHRIMP Cui et al., 2020a CK03-12 变花岗闪长岩 2 360±5 SHRIMP Cui et al., 2020a MJC03-16 片麻状花岗岩 2 336±12 SHRIMP Cui et al., 2020a MJC03-16 片麻状花岗岩 1 964±8 SHRIMP Cui et al., 2020a LH12 奥长花岗质片麻岩 3 061±23 LA-ICP-MS Cui et al., 2020b LH14 奥长花岗质片麻岩 3 073±23 LA-ICP-MS Cui et al., 2020b LH15 奥长花岗质片麻岩 3 104±11 SHRIMP Cui et al., 2020b LH18 片麻状二长花岗岩 2 855±16 LA-ICP-MS Cui et al., 2020b LH20 片麻状花岗闪长岩 2 853±14 LA-ICP-MS Cui et al., 2020b LH22 片麻状花岗闪长岩 2 859±11 SHRIMP Cui et al., 2020b CKN08 变二长花岗岩 1 935±19 LA-ICP-MS Cui et al., 2020b CKN09 变二长花岗岩 1 885±19 LA-ICP-MS Cui et al., 2020b Yjck-07 变基性岩 2 395±22 LA-ICP-MS Liu et al., 2020 Yjhlc-16 变基性岩 2 354±11 LA-ICP-MS Liu et al., 2020 Yjyw-33 变基性岩 2 316±8 LA-ICP-MS Liu et al., 2020 Yjyw-36 变基性岩 2 329±17 LA-ICP-MS Liu et al., 2020 DA842-TW1 奥长花岗质片麻岩 2 845±13 LA-ICP-MS 本文 17CK15-TW2 变二长花岗岩 2 401±15 LA-ICP-MS 本文 DA238-TW1 片麻状花岗岩 2 306±19 LA-ICP-MS 本文 DA238-TW1 片麻状花岗岩 1 955±53 LA-ICP-MS 本文 PMA04-TW4 斜长黑云碎粒岩 1 948±16 LA-ICP-MS 本文 
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