Geochronological characteristics of S-type granites of the Baoshan block in western Yunnan: Constraints on Proto-Tethys Ocean evolution
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摘要:
云南保山地块保存有早古生代岩浆活动信息，为揭示滇西原特提斯洋构造演化特征提供了天然窗口。本文对保山地块漕涧二云母花岗岩进行详细的岩石学、全岩地球化学以及同位素年代学研究。研究结果显示，两个代表性二云母花岗岩样品的锆石U-Pb年龄分别为（449±3）Ma和（451±2）Ma，表明本区存在晚奥陶世岩浆作用。二云母花岗岩样品具有较高的铝饱和指数，其A/CNK值＞1.2，属于过铝质花岗岩。它们相对富集LILEs（大离子亲石元素），亏损HFSEs（高场强元素），REE（稀土元素）配分模式整体呈平缓右倾型，具有明显的负铕异常。综合分析表明，这些二云母花岗岩属于S型花岗岩，来源于变质泥岩在较高温度下的部分熔融，并经历了一定程度的分离结晶作用。它们产于同碰撞向后碰撞转变的构造环境，暗示滇西地区的原特提斯洋于晚奥陶世趋于消亡。
Abstract:The Baoshan block records important information of early Paleozoic magmatism, providing a natural window to reveal the tectonic evolutionary features of the Proto-Tethys Ocean in western Yunnan. In this study, detailed petrological, petrographic, geochemical, and zircon U-Pb geochronological data of the Caojian two-mica granite within the Baoshan block are presented. Results show that two representative granite samples have zircon U-Pb ages of (449±3) Ma and (451±2) Ma, respectively, indicating late Ordovician magmatic activity occurred in the Caojian area. The two-mica granite has a high aluminum saturation index (A/CNK＞1.2) and belongs to peraluminous granite. The samples display enrichment in large ionic lithophilic elements (LILEs) and depleted in high-field-strength elements (HFSEs), with right-sloping chondrite–normalized REE patterns and obvious negative Eu anomalies. These data indicate that the Caojian two-mica granites belong to S-type granite, and are derived from the partial melting of metamorphic mudstone under high temperature conditions, and fractional crystallization occurred during the process of magmatic evolution. They are formed in a transitional background from syn-collision to post-collision, which implies that the Proto-Tethys Ocean in western Yunnan tended to disappear in the late Ordovician.
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Key words:
- Proto-Tethys Ocean /
- early Paleozoic /
- geochronology and geochemistry /
- granite /
- Baoshan block
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图 7 漕涧二云母花岗岩Rb/Ba–Rb/Sr（a），CaO/Na2O–Al2O3/TiO2（b），Zr/Sm–Zr（c），及La/Sm–La（d）图解 （b据Sylvester, 1998；c，d据Allègre and Minster，1978）
Figure 7.
图 8 漕涧二云母花岗岩lg[CaO/（Na2O+K2O）]–SiO2（a），R2–R1（b），Rb–（Y+Nb）（c）及Rb–（Yb+Ta）（d）图解（a据Brown，1982；b据Batchelor and Bowden，1985；c-d据Pearce et al.，1984）
Figure 8.
表 1 保山地块早古生代岩浆岩年龄统计表
Table 1. Ages of igneous rocks from Baoshan block in the early Paleozoic
位置 岩性 年龄/Ma 测试方法 参考文献 平河 黑云母花岗岩 472±5 LA-ICP-MS 锆石U-Pb Chen et al.，2007 平河 黑云母花岗岩 466±11 LA-ICP-MS 锆石U-Pb Chen et al.，2007 平河 二长花岗岩 498.5±4.6 LA-ICP-MS 锆石U-Pb Liu et al.，2009 平河 二长花岗岩 502±4.7 LA-ICP-MS 锆石U-Pb Liu et al.，2009 平河 二长花岗岩 500.1±4.1 LA-ICP-MS 锆石U-Pb Liu et al.，2009 平河 二长花岗岩 472±5 LA-ICP-MS 锆石U-Pb 邢晓婉，2016 象达 二长花岗岩 473±6 LA-ICP-MS 锆石U-Pb Wang et al.，2013 象达 二长花岗岩 473±5 LA-ICP-MS 锆石U-Pb Wang et al.，2013 象达 二长花岗岩 472±5 LA-ICP-MS 锆石U-Pb Wang et al.，2013 龙陵 二长花岗岩 486.3±5.5 LA-ICP-MS 锆石U-Pb 董美玲，2016 龙陵 花岗岩 486±12 LA-ICP-MS 锆石U-Pb 董美玲，2016 龙陵 二长花岗岩 467.1±5.1 LA-ICP-MS 锆石U-Pb 高煜，2023 龙陵 二长花岗岩 467.9±5.1 LA-ICP-MS 锆石U-Pb 高煜，2023 西盟 淡色花岗岩 463±3 LA-ICP-MS 锆石U-Pb 邢晓婉，2016 西盟 片麻状花岗岩 460±6 LA-ICP-MS 锆石U-Pb 邢晓婉，2016 西盟 淡色花岗岩 462±5 LA-ICP-MS 锆石U-Pb 邢晓婉，2016 西盟 花岗片麻岩 455±3 SHRIMP 锆石U-Pb 尹福光等，2021 镇安 正长花岗岩 447±3 LA-ICP-MS 锆石U-Pb Zhao et al.，2016 镇安 正长花岗岩 445±2 LA-ICP-MS 锆石U-Pb Zhao et al.，2016 双麦地 二云斑状花岗岩 460±4 LA-ICP-MS 锆石U-Pb Li et al.，2015 勐冒 二云斑状花岗岩 460±6 LA-ICP-MS 锆石U-Pb Li et al.，2015 漕涧 二长花岗岩 454.9±5 LA-ICP-MS 锆石U-Pb 高煜，2023 漕涧 二长花岗岩 456.6±6.5 LA-ICP-MS 锆石U-Pb 高煜，2023 漕涧 二长花岗岩 454±3 LA-ICP-MS 锆石U-Pb 黄亮等，2021 漕涧 二长花岗岩 457±4 LA-ICP-MS 锆石U-Pb 黄亮等，2021 漕涧 二云母花岗岩 449±3 LA-ICP-MS 锆石U-Pb 本文 漕涧 二云母花岗岩 451±2 LA-ICP-MS 锆石U-Pb 本文 漕涧 二长花岗岩 441±9 SHRIMP 锆石U-Pb 尹福光等，2021 漕涧 二长花岗岩 457±7 SHRIMP 锆石U-Pb 尹福光等，2021 邦迈 斜长角闪岩 536.7±2.2 LA-ICP-MS 锆石U-Pb 徐晓尹等，2017 邦迈 黑云斜长角闪岩 532±2.8 LA-ICP-MS 锆石U-Pb 徐晓尹等，2017 邦迈 斜长角闪岩 499.2±2.1 LA-ICP-MS 锆石U-Pb 杨学俊等，2012 邦迈 黑云斜长片麻岩 512±7 SHRIMP 锆石U-Pb 尹福光等，2021 
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