Petrogenesis and geodynamic implications of Neoproterozoic typical intermediate-felsic magmatism in the western margin of the Yangtze Block, South China
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摘要: 华南板块发育有巨量新元古代岩浆岩，因而是研究罗迪尼亚（Rodinia）超大陆演化期间华南板块地幔属性、地壳演化和壳幔相互作用最理想的场所。虽然在扬子西缘新元古代镁铁质和酸性岩浆作用方面已有大量的研究，但是在系统研究中酸性花岗岩类所代表的不同深部动力学意义的方面还较为薄弱。文章基于团队近期对于扬子板块西缘新元古代典型花岗岩类的研究成果，系统揭示不同深度层次的岩浆作用。最新研究支持扬子西缘新元古代受控于俯冲构造背景，除发生俯冲流体和板片熔体交代地幔作用外，最新识别的ca.850~835 Ma高Mg#闪长岩指示俯冲沉积物熔体也参与了地幔交代作用。Ca.840~835 Ma过铝质花岗岩的发现说明扬子西缘新元古代时期不仅存在新生镁铁质下地壳的熔融，也发生了俯冲背景下成熟大陆地壳物质的重熔。Ca.780 Ma Ⅰ型花岗闪长岩-花岗岩组合揭示了俯冲阶段后期板片回撤断离后软流圈地幔瞬时上涌引发的不同地壳层次的岩浆响应。从ca.800 Ma的增厚下地壳来源的埃达克质花岗岩到ca.750 Ma的酸性地壳来源的A型花岗岩的出现，表明扬子西缘新元古代时期经历了俯冲有关的地壳增厚到俯冲后期弧后扩张背景下的区域性地壳减薄。
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关键词:
- 扬子西缘 /
- 中酸性岩浆事件 /
- 俯冲背景 /
- 不同深度层次岩浆作用
Abstract: The South China Block preserves voluminous Neoproterozoic magmatism, it is thus an ideal site for understanding the mantle nature, crustal evolution, and crust-mantle interaction during the assembly and breakup of the Rodinia supercontinent. Although the previous studies have paid more attention to the mafic and felsic rocks, the systematic deep dynamics of intermediate-felsic intrusive rocks is unsubstantial. Based on the recent studies on the Neoproterozoic typical granitoid magmatism, this study provides a systematic insight on the magmatic response of different depth under subduction setting. The new study reveals that the western margin of the Yangtze Block was located at the subduction setting. Apart from the subduction fluids- and slab melts-related mantle metasomatism, the newly recognized ca.850~835 Ma high-Mg# diorites suggest that there existed the subducted sediment melts-related mantle metasomatism. In addition, the identification of ca.840~835 Ma peraluminous granites indicates that the western margin of the Yangtze Block underwent not only the melting of the juvenile mafic lower crust but also the reworking of the mature continental crust during the Neoproterozoic. Moreover, the ca.780 Ma Ⅰ-type granodiorites-granites stand for the magmatic response of different crustal depth induced by the upwelling of asthenosphere mantle. The occurrence from ca.800 Ma thickened lower crust-derived adakitic granites to ca.750 Ma felsic crust-derived A-type granites suggest the geodynamic transition from regionally crustal thickening to extensional thinning under subduction background. -
图 1 华南地理位置与区域地质简图(据Zhao and Cawood, 2012；Zhao et al., 2018修改)
a—华南地理位置；b—华南区域地质简图
Figure 1. Geological position and simplified geological map of South China (modified after Zhao and Cawood, 2012; Zhao et al., 2018)
图 2 扬子板块西缘区域地质图及研究岩体地理位置(据Zhao et al., 2019修改)
1—水陆地区高Mg#闪长岩；2—米易地区过铝质花岗岩；3—大陆地区Ⅰ型花岗质岩石；4—攀枝花—盐边地区辉长闪长岩-埃达克花岗岩-A型花岗岩
a—扬子西缘地理位置；b—扬子西缘区域地质简图Figure 2. Simplified geological map of the western margin of the Yangtze Block and the geological position of the studied plutons (modified after Zhao et al., 2019)
图 3 扬子板块西缘新元古代水陆岩体地理位置与区域地质简图(据Zhu et al., 2020a修改)
a—华南区域地质简图; b—扬子西缘区域地质简图; c—水陆岩体区域地质简图
Figure 3. Geological position and simplified geological sketch map of the Neoproterozoic shuilu pluton of the Yangtze Block(modified after Zhu et al., 2020a)
图 4 扬子板块西缘新元古代水陆高Mg#闪长岩主微量图解(据Zhu et al., 2020a修改)
a—Na2+Ka2O vs. SiO2图解(Middlemost, 1994)；b—K2O vs. SiO2图解(Roberts and Clemens, 1993)；c—A/NK vs. A/CNK图解(Frost et al., 2001)；d—Mg# vs. SiO2图解；e—Sr/Y vs. Y图解；f—(La/Yb)N vs. (Yb)N图解(Defant and Drummond, 1990)
Figure 4. Major and trace elements diagrams for the Neoproterozoic Shuilu high-Mg# diorites in the western margin of the Yangtze Block (modified after Zhu et al., 2020a)
图 5 扬子板块西缘新元古代水陆高Mg#闪长岩球粒陨石标准化蛛网图和原始地幔标准化微量元素蛛网图(Sun and McDonough, 1989；据Zhu et al., 2020a修改)
a—水陆高Mg#闪长岩球粒陨石标准化图；b—水陆高Mg#闪长岩原始地幔标准化微量元素蛛网图
Figure 5. Diagrams of chondrite-normalized REE patterns and primitive mantle-normalized trace-element patterns for the Neoproterozoic Shuilu high-Mg# diorites in the western margin of the Yangtze Block (Sun and McDonough, 1989; modified after Zhu et al., 2020a)
图 6 扬子板块西缘新元古代水陆高Mg#闪长岩全岩Sr-Nd同位素和锆石Hf同位素图解(据Zhu et al., 2020a修改)
a—水陆高Mg#闪长岩全岩εNd(t) vs. (87Sr/86Sr)i图解；b—水陆高Mg#闪长岩锆石εHf(t) vs.锆石U-Pb年龄图解
Figure 6. Diagrams of whole-rock Sr-Nd isotopes and zircon Hf isotopes for the Neoproterozoic Shuilu high-Mg# diorites in the western margin of the Yangtze Block (modified after Zhu et al., 2020a)
图 7 扬子板块西缘新元古代水陆高Mg#闪长岩俯冲组分判别图(据Zhu et al., 2020a修改)
a—Rb/Y vs. Nb/Y图解(Kepezhinskas et al., 1997)；b—Ba vs. Nb/Y图解(Kepezhinskas et al., 1997)；c—锆石εHf(t) vs.全岩εNd(t)图解(Zhao et al., 2019)；d—Th/Ce vs. Th/Sm图解(Guo et al., 2015; Zhang et al., 2019)；e—Ba/La vs. Th/Yb图解(Hanyu et al., 2006修改)
Figure 7. Discriminant diagrams of subduction components for the Neoproterozoic Shuilu high-Mg# diorites in the western margin of the Yangtze Block (modified after Zhu et al., 2020a)
图 8 扬子板块西缘新元古代水陆高Mg#闪长岩锆石微量元素图解(Zhu et al., 2020a)
a—水陆高Mg#闪长岩锆石U/Yb vs. Hf图解；b—水陆高Mg#闪长岩锆石U/Yb vs. 10000*Nb/Yb图解(Grimes et al., 2015; Zhao et al., 2019)
Figure 8. Diagrams of zircon trace elements for the Neoproterozoic Shuilu high-Mg# diorites in the western margin of the Yangtze Block (Zhu et al., 2020a)
图 9 扬子板块西缘新元古代宽裕-茨达过铝质花岗岩体区域地质简图(据Zhu et al., 2019c修改；研究区位置见图 3b)
Figure 9. Simplified geological sketch map of the Neoproterozoic Kuanyu and Cida peraluminous granitic plutons in the western margin of the Yangtze Block (modified after Zhu et al., 2019c. The geological positon of the study area is shown in Fig. 3b)
图 10 扬子板块西缘新元古代宽裕-茨达过铝质花岗岩主量元素图解(据Zhu et al., 2019c修改)
a—A/NK vs. A/CNK图解(Frost et al., 2001)；b—(Na2O+K2O - CaO) vs. SiO2图解(Frost et al., 2001)；c—K2O/Na2O vs. SiO2图解(Moyen and Martin, 2012)；d—Mg# vs. SiO2图解
Figure 10. Major elements diagrams for the Neoproterozoic Kuanyu and Cida peraluminous granites in the western margin of the Yangtze Block (modified after Zhu et al., 2019c)
图 11 扬子板块西缘新元古代宽裕-茨达过铝质花岗岩全岩Sr-Nd同位素和锆石Hf同位素图解(据Zhu et al., 2020c修改)
a—宽裕-茨达过铝质花岗岩全岩εNd(t) vs. (87Sr/86Sr)i图解；b—宽裕-茨达过铝质花岗岩锆石εHf(t) vs.锆石U-Pb年龄图解
Figure 11. Diagrams of whole-rock Sr-Nd isotopes and zircon Hf isotopes for the Neoproterozoic Kuanyu and Cida peraluminous granites in the western margin of the Yangtze Block (modified after Zhu et al., 2020c)
图 12 扬子板块西缘新元古代宽裕-茨达过铝质花岗岩岩浆源区图解(据Zhu et al., 2019c修改)
a—CaO/Na2O vs. Al2O3/TiO2图解(Sylvester, 1998)；b—Rb/Ba vs. Rb/Sr图解(Patiño Douce 1999)；c—molar Al2O3/(MgO+FeOT) vs. molar CaO/(MgO+FeOT)图解(Altherr et al., 2000)
Figure 12. Discriminant diagrams of magma source for the Neoproterozoic Kuanyu and Cida peraluminous granites in the western margin of the Yangtze Block (modified after Zhu et al., 2019c)
图 13 扬子板块西缘新元古代大陆Ⅰ型花岗岩体区域地质简图(据Zhu et al., 2019a修改；研究区位置见图 3b)
Figure 13. Simplified geological sketch map of the Neoproterozoic Dalu Ⅰ-type granitic pluton in the western margin of the Yangtze Block (modified after Zhu et al., 2019a. The geological positon of the study area is shown in Fig. 3b)
图 14 扬子板块西缘新元古代大陆Ⅰ型花岗闪长岩-花岗岩主微量元素图解(据Zhu et al., 2019a修改)
a—Q-A-P-F图解(Middlemost, 1994)；b—K2O vs. SiO2图解(Roberts and Clemens, 1993)；c—A/NK vs. A/CNK图解(Frost et al., 2001)；d—Na2O+K2O vs. SiO2图解(Middlemost, 1994)；e—Rb-Ba-Sr
Figure 14. Major and trace elements diagrams for the Neoproterozoic Dalu Ⅰ-type granodiorites-granites in the western margin of the Yangtze Block (modified after Zhu et al., 2019a)
图 15 扬子板块西缘新元古代大陆Ⅰ型花岗闪长岩-花岗岩岩体岩浆源区判别图解(据Zhu et al., 2019a修改)
a—Mg# vs. SiO2图解；b—Nb/Y vs. Rb/Y图解；c—CaO/Na2O vs. Al2O3/TiO2图解(Sylvester, 1998)；d—Rb/Ba vs. Rb/Sr图解(Patiño Douce 1999)；e—(Na2O+K2O)/(FeOT+MgO+TiO2) vs. Na2O+K2O+FeOT+MgO+TiO2图解(Patiño Douce 1999)；f—CaO/(MgO+FeOT+TiO2) vs. CaO+MgO+FeOT+TiO2图解(Patiño Douce 1999)
Figure 15. Discriminant diagrams of magma source for the Neoproterozoic Dalu Ⅰ-type granodiorites-granites in the western margin of the Yangtze Block (modified after Zhu et al., 2019a)
图 16 扬子板块西缘攀枝花—盐边地区地理位置和区域地质简图(据Zhu et al., 2019b修改)
a—攀枝花—盐边地区地理位置；b—攀枝花—盐边地区区域地质简图
Figure 16. Geological position and simplified geological sketch map of the Panzhihua-Yanbian region in the western margin of the Yangtze Block (modified after Zhu et al., 2019b)
图 17 扬子板块西缘新元古代大尖山辉长闪长岩和埃达克花岗岩主微量元素图解(据Zhu et al., 2019c修改)
a—(La/Yb)N vs. (Yb)N图解(Defant and Drummond, 1990; Martin et al., 2005)；b—Sr/Y vs. Y图解(Defant and Drummond, 1990; Martin et al., 2005)；c—全岩εNd(t) vs. (87Sr/86Sr)i图解；d—Th/Yb vs. Nb/Yb图解(Pearce, 2008)；e—Nb/Zr vs. Th/Zr图解(Kepezhinskas et al., 1997)；f—Rb/Y vs. Nb/Y图解(Kepezhinskas et al., 1997)；g—MgO vs. SiO2图解；h—Mg# vs. SiO2图解
Figure 17. Major and trace elements diagrams for the Neoproterozoic Dajianshan gabbro-diorites and adakitic granites in the western margin of the Yangtze Block(modified after Zhu et al., 2019c)
图 18 扬子板块西缘新元古代攀枝花高分异A2型花岗岩主微量元素图解(据Zhu et al., 2019c修改)
a—Nb vs.10000*Ga/Al图解(Whalen et al., 1987)；b—Nb-Y-Zr/4图解(Eby, 1992)；c—Sr vs. Rb图解(Sami et al., 2018)；d—Ba vs. Rb图解(Sami et al., 2018)；e—FeOT/(FeOT+MgO) vs. SiO2图解(Patiño Douce, 1997)；f—CaO/(FeO+MgO+TiO2) vs. CaO+FeO+MgO+TiO2图解(Patiño Douce, 1999)
Figure 18. Major and trace elements diagrams for the Neoproterozoic Panzhihua highly fractionated A2-type granites in the western margin of the Yangtze Block(modified after Zhu et al., 2019c)
图 19 扬子板块西缘新元古代俯冲背景下地幔交代作用(据Zhu et al., 2020a修改)
a—扬子西缘ca.870~820 Ma俯冲进程及主要俯冲组分；b—扬子西缘ca.820~740 Ma俯冲进程及主要俯冲组分；c—扬子西缘ca.870~740 Ma地幔源区涉及的俯冲组分
Figure 19. A sketch map and summary for the Neoproterozoic metasomatized mantle magmatism under subduction setting in the western margin of the Yangtze Block (modified after Zhu et al., 2020a)
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