Petrogenesis and tectonic setting of the Muzidian granite complex in Northern Dabie Orogen: Constraints from Sr−Nd−Pb isotopic geochemistries
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摘要:
研究目的 木子店复式岩体处于北大别变质杂岩带北部，其岩性主要为斑状黑云二长花岗岩、斑状黑云角闪二长花岗岩、细中粒黑云二长花岗岩和细粒黑云二长花岗岩。为探讨其物质来源、成因机制和地球化学动力学背景，进一步研究大别地区早白垩世大规模构造-岩浆演化作用，
研究方法 在前期工作的基础上，选取木子店复式岩体进行系统的Sr−Nd−Pb同位素测试。
研究结果 结果表明，木子店岩体的全岩同位素具有较低的Sr初始比值[(87Sr/86Sr)i = 0.70670~0.70895]，εNd(t)亦很低，主要集中在−23.16~−14.11之间，类似于扬子克拉通北缘新元古代TTG的Sr−Nd同位素特征；较老的Nd模式年龄(TDM2=2.99~2.07 Ga)，结合其地球化学特征和锆石Hf同位素特征，说明它是扬子克拉通北缘中下地壳俯冲部分熔融的产物。低的Pb同位素组成[(206Pb/204Pb)i=17.0056~17.4476，(207Pb/204Pb)i=15.4595~15.5996，(208Pb/204Pb)i=37.7627~38.1417]，同样表明其与扬子北缘岩石的亲缘性。木子店岩体中主体岩石表现为埃达克岩特征，来源于增厚的玄武岩下地壳的熔融；仅月形塘单元表现为岛弧岩浆岩性质，但它同样来源于俯冲下地壳的熔融，只是携带了较多富集地幔成分。
结论 结合其地球化学、年代学、锆石Hf同位素研究，认为木子店复式花岗岩体源自扬子克拉通北缘下地壳，其成分类似于其中新元古代TTG类岩石。俯冲到华北克拉通之下的扬子北缘并未发生拆沉作用，只是在俯冲板片的不同部位发生了部分熔融形成了木子店复式岩体，这一成岩作用可能记录了大别地区从俯冲碰撞到伸展减压的转换过程，转换时间极可能发生在131 Ma左右。
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关键词:
- 北大别 /
- 木子店岩体 /
- Sr−Nd−Pb同位素 /
- 源区特征 /
- 构造-岩浆演化
Abstract:Objective The Muzidian granite complex is located in Northern Dabie Orogen, and its main lithology is porphyritic biotite monzogranite, porphyritic biotite hornblende monzogranite, fine−medium grain biotite monzogranite and fine grain biotite monzogranite. In order to discuss the material source, petrogenetic machanism, and geochemical dynamic background of the Muzidian granites, and even study the large−scale tectono−magmatic evolution during the Early Cretaceous in Dabie area,
Methods the Muzidian granite complex was chosen to test the Sr−Nd−Pb systematic isotopic geochemistry after the previous work.
Results The Muzidian granites have a low initial Sr ratio[(87Sr/86Sr)i=0.70670~0.70895], and εNd(t) is also low, mainly concentrated in −23.16~−14.11. They have much old Nd model age (TDM2=2.99~2.07 Ga) and low radioactive Pb isotopic composition [(206Pb/204Pb)i=17.0056~17.4476, (207Pb/204Pb)i=15.4595~15.5996, (208Pb/204Pb)i=37.7627~38.1417]. The results tell us that the main rocks in the Muzidian granite complex are characterized for adakite, which is derived from the melting of the thickened basaltic lower crust. Only the Yuexingtang unit is characterized for arc magmatic rocks, which is also derived from the melting of the subducted lower crust, and carry more enriched mantle components.
Conclusions With the geochemical, chronological and zircon Hf isotopic studies, it is concluded that the Muzidian granite complex was derived from the lower crust of the northern margin of the Yangtze craton. And the composition of the granites may be similar to the Neoproterozoic TTG rocks. The delamination didn’t happen after the northern margin of the Yangtze subducted to the North China Craton, but partial melting happened at different parts of the subduction slab to form the Muzidian granite complex. This diagenesis may record the transition process from subduction collision to extension in Dabie area, and the transition time is most likely to be 131 Ma.
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图 4 木子店岩体的岩石性质投图（据Qin et al., 2010，数据来源于李小林等，2016；样号同图3）
Figure 4.
图 3 木子店岩体 Pb 同位素投图（据Huang et al., 2007修改）
Figure 3.
图 6 木子店岩体岩石成因投图（数据来自李小林等, 2016；样号同图3）
Figure 6.
图 7 木子店岩体构造环境判别图解（数据来源于李小林等, 2016；样号同图3）
Figure 7.
表 1 大别地区中生代花岗岩类同位素年龄及Hf同位素数据
Table 1. Isotope ages and Hf isotope data of the Mesozoic granitoid rocks in Dabie area
岩体 岩性 年龄/Ma 测试对象及方法 εHf(t) TDM2/Ma 资料来源 姚冲 二长花岗岩 139.6±2.0 LA−ICP−MS锆石U−Pb −30~−22.8 2212~2606 刘清泉等, 2015 姚冲 花岗斑岩 139.8±2.2 LA−ICP−MS锆石U−Pb −26.5~−23.6 2252~2414 刘清泉等, 2015 姚冲 花岗岩 133.3±1.3 LA−ICP−MS锆石U−Pb −26.5~−20.0 2430~2830 陈伟等, 2013 新县 花岗岩 125.5±1.5 LA−ICP−MS锆石U−Pb −22.92~−19.4 2390~2610 Chen et al., 2015 汤家坪 花岗斑岩 121±4.6 LA−ICP−MS锆石U−Pb −17.6~−10.4 1843~2281 魏庆国等, 2010 商城 斑状黑云母二长花岗岩 137±2 LA−ICP−MS锆石U−Pb −30.2~–15.6 2173~3079 高昕宇等, 2013 达权店 二长花岗岩 118±1 LA−ICP−MS锆石U−Pb −23.2~–16.7 2227~2628 高昕宇等, 2013 千鹅冲 二长花岗岩 130±2 SHRIMP锆石U−Pb −24.5~–11.3 1362~2736 高阳等, 2014 千鹅冲 花岗斑岩 129±2 SHRIMP锆石U−Pb −19. 8~–11.2 1895~2385 高阳等, 2014 石鼓尖 角闪石英二长闪长岩 132.8±4.3 SHRIMP锆石U−Pb −30.5~–27.9 2942~3100 续海金等, 2008 舒潭 斑状二长花岗岩 132.3±1.0 SHRIMP锆石U−Pb −26.0~–20.9 2502~2824 续海金等, 2008 舒潭 钾长花岗岩 127.9±0.8 SHRIMP锆石U−Pb −25.2~–15.1 2133~2766 续海金等, 2008 天堂寨 斑状二长花岗岩 131.7±3.6 LA−ICP−MS锆石U−Pb −28.1~–22.5 2604~2885 续海金等, 2008 沙坪沟 石英二长岩 134±2 LA−ICP−MS锆石U−Pb −33.6~–17.0 2556~3292 Wang et al., 2014 沙坪沟 正长花岗岩 132±1 LA−ICP−MS锆石U−Pb −28.2~–23.5 2640~2957 Wang et al., 2014 沙坪沟 花岗斑岩 138±8 LA−ICP−MS锆石U−Pb −23.7~−16.9 2253~2683 Wang et al., 2014 沙坪沟 石英二长斑岩 135±4 LA−ICP−MS锆石U−Pb −32.1~−20.3 2465~3198 Wang et al., 2014 沙坪沟 二长花岗岩 135±1 LA−ICP−MS锆石U−Pb −31.1~−24.2 2708~3142 Wang et al., 2014 沙坪沟 黑云母闪长岩 128±2 LA−ICP−MS锆石U−Pb −27.9~−22.0 2565~2934 Wang et al., 2014 沙坪沟 黑云母二长岩 129±2 LA−ICP−MS锆石U−Pb −26.6~−21.9 2564~2857 Wang et al., 2014 沙坪沟 石英正长岩 116±2 LA−ICP−MS锆石U−Pb −17.2~−12.9 1989~2261 Wang et al., 2014 沙坪沟 花岗岩斑岩 114±1 LA−ICP−MS锆石U−Pb −23.4~−10.4 1826~2642 Wang et al., 2014 木子店 细粒二长花岗岩 128.9±0.7 LA−ICP−MS锆石U−Pb −25.1~−19.2 2115~2505 刘劲松等, 2016 木子店 斑状黑云角闪二长花岗岩 133±2 LA−ICP−MS锆石U−Pb −26.5~−19.6 2139~2531 刘阿睢等, 2017 木子店 斑状黑云二长花岗岩 131.1±0.5 LA−ICP−MS锆石U−Pb −21.83~−13.98 1826~2246 胡俊良等, 2018 
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表 2 木子店岩体的全岩Sr−Nd同位素组成
Table 2. Whole rock Sr−Nd isotopic compositions of the Muzidian granites in Dabie Orogen
样品号 含量/10−6 87Rb/86Sr 87Sr/86Sr 2σ/10−5 (87Sr/86Sr)i 含量/10−6 147Sm/144Nd 143Nd/144Nd 2s/10−6 fSm/Nd εNd(t) TDM/Ma TDM2/Ma Rb Sr Sm Nd 桃花尖单元（K2Tηγβ），128.9±0.7 Ma M16-1 158.2 246.4 1.851 0.71237 8 0.70895 2.105 14.92 0.0854 0.511538 6 −0.566 −19.62 1909 2516 M16-4 84.61 303 0.8053 0.70888 6 0.70739 1.783 13.79 0.0782 0.512064 4 −0.602 −9.23 1221 1675 白衣冲单元（K1Bπηγβ），131.1±0.5 Ma M16-3 100.2 491.8 0.5878 0.70857 4 0.70748 9.826 57.15 0.104 0.511836 3 −0.471 −14.11 1821 2069 M16-16 123.7 668.1 0.5338 0.70895 2 0.70796 12.47 92.53 0.0815 0.511603 5 −0.586 −18.28 1779 2409 M16-19 83.38 767.5 0.3132 0.70857 4 0.70799 7.414 42.95 0.1044 0.511795 2 −0.469 −14.92 1884 2134 M16-21 114.4 337.3 0.9777 0.70976 6 0.70795 3.306 27.92 0.0716 0.511611 9 −0.636 −17.96 1647 2384 M16-22 85.45 751.5 0.3278 0.70731 2 0.70670 4.587 29.56 0.0939 0.511802 3 −0.523 −14.61 1711 2110 月形塘单元（K1Yηγβψ），133±2 Ma M16-20 143 519 0.7947 0.70939 2 0.70792 5.277 34.25 0.0932 0.511798 3 −0.526 −14.67 1706 2115 M16-23 112.5 638.4 0.5082 0.70865 2 0.70771 7.958 49.8 0.0967 0.51151 5 −0.508 −20.35 2128 2574 M16-24 105.9 526.4 0.58 0.70883 8 0.70776 5.17 37.01 0.0845 0.511519 5 −0.570 −19.97 1918 2545 M16-25 93.06 775 0.3462 0.7081 3 0.70746 4.904 30.27 0.098 0.511524 6 −0.502 −20.10 2134 2554 乌石岩单元（K1Wηγβ） M16-2 94.39 544.7 0.4997 0.70922 9 0.70830 5.071 39.46 0.0778 0.511615 2 −0.604 −17.99 1717 2385 M16-5 85.86 517.3 0.4786 0.70813 6 0.70725 5.016 35.55 0.0854 0.511656 5 −0.566 −17.31 1770 2330 M16-6 178 159.6 3.219 0.71724 7 0.71129 6.101 40.11 0.092 0.511243 7 −0.532 −25.48 2377 2989 M16-7 125.4 257.6 1.404 0.7101 6 0.70751 2.903 18.7 0.0939 0.511646 5 −0.523 −17.65 1908 2356 M16-8 78.56 398.6 0.5683 0.7086 7 0.70755 4.238 31.58 0.0812 0.51163 4 −0.587 −17.75 1744 2366 M16-9 125.9 604.4 0.6006 0.70873 4 0.70762 9.205 57.68 0.0965 0.511627 2 −0.509 −18.06 1974 2389 M16-10 122.4 501.4 0.704 0.70845 8 0.70715 3.334 17.85 0.0113 0.511578 4 −0.943 −17.61 1183 2359 M16-11 151.7 384.6 1.138 0.71084 4 0.70874 12.26 73.24 0.1013 0.511665 6 −0.485 −17.40 2007 2335 M16-12 138.7 345.2 1.159 0.71035 5 0.70821 6.614 45.77 0.0874 0.511451 4 −0.556 −21.35 2043 2656 M16-13 127.6 449.6 0.8184 0.70984 6 0.70833 5.456 42.51 0.0776 0.51135 3 −0.605 −23.16 2009 2804
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表 3 木子店岩体全岩Pb同位素组成
Table 3. Whole rock Pb isotopic compositions of the the Muzidian granites
样品号 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb (206Pb/204Pb)i (207Pb/204Pb)i (208Pb/204Pb)i μ 桃花尖单元（K2Tηγβ），128.9±0.7 Ma M16-1 17.4073 15.5851 38.1207 17.3521 15.5824 37.9877 2.7093 M16-4 17.4485 15.5600 37.9556 17.4292 15.5590 37.9095 0.9471 白衣冲单元（K1Bπηγβ），131.1±0.5 Ma M16-3 17.4445 15.5670 38.1831 17.4351 15.5665 38.1417 0.4605 M16-16 17.4274 15.5650 38.0875 17.4160 15.5644 38.0508 0.5604 M16-19 17.4606 15.5931 38.1137 17.4437 15.5923 38.0363 0.8285 M16-21 17.4586 15.5861 38.0804 17.4514 15.5857 38.0522 0.3540 M16-22 17.3470 15.5509 37.9939 17.3265 15.5499 37.9492 1.0051 月形塘单元（K1Yηγβψ），133±2 Ma M16-20 17.4938 15.5911 38.1167 17.4280 15.5879 37.9864 3.2274 M16-23 17.0696 15.4725 37.9425 17.0186 15.4700 37.7766 2.5024 M16-24 17.3842 15.5338 37.9163 M16-25 17.0244 15.4604 37.8127 17.0056 15.4595 37.7627 0.9225 乌石岩单元（K1Wηγβ） M16-2 17.4626 15.5801 38.1257 17.4438 15.5791 38.0318 0.9231 M16-5 17.4083 15.5921 38.2103 17.3448 15.5890 38.0421 3.1203 M16-6 17.5340 15.5760 38.0835 17.4148 15.5702 37.7720 5.8497 M16-7 17.4395 15.5710 38.0754 17.3974 15.5690 37.9726 2.0647 M16-8 17.4586 15.5630 38.0794 17.4389 15.5620 38.0120 0.9640 M16-9 17.5028 15.5811 38.1056 17.4160 15.5768 37.9333 4.2613 M16-10 17.2958 15.5388 38.0200 17.1758 15.5330 37.9306 5.8876 M16-11 17.3531 15.5620 38.1680 17.3335 15.5610 38.0783 0.9584 M16-12 17.4807 15.5720 38.0482 17.4476 15.5704 37.9579 1.6252 M16-13 17.5360 15.6062 38.1137 17.4009 15.5996 37.9559 6.6295
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