Petrogenesis and Implications of the Late Jurassic Granitoid and Its Mafic Microgranular Enclaves in West Guangdong Province: Constraints from Geochronological, Mineralogical and Geochemical Evidence
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摘要: 粤西阳江市八二花岗质岩体中广泛发育似斑状细粒闪长质暗色微粒包体,这些暗色微粒包体形态多样,与寄主岩具相似的矿物组合,对研究花岗岩成因和壳-幔相互作用具有十分重要的意义.为了探讨它们的岩石成因及构造属性,对寄主岩和暗色微粒包体开展了系统的岩相学、年代学和地球化学研究.LA-ICP-MS锆石U-Pb定年结果表明,寄主岩年龄为160.0±1.0 Ma,暗色微粒包体年龄为159.3±1.1 Ma,均为晚侏罗世的产物.全岩地球化学特征显示,寄主岩属于富钾的准铝质I型花岗岩,寄主岩和暗色微粒包体均富集轻稀土元素和大离子亲石元素,亏损重稀土元素和Nb、Ta、Ti等高场强元素.此外,两者具相似的Sr-Nd同位素组成,寄主岩的εNd(t)值为-5.73~-5.67,(87Sr/86Sr)i值为0.707 63~0.707 67;而暗色微粒包体的εNd(t)值为-5.81~-4.35,(87Sr/86Sr)i值为0.707 04~0.707 74.锆石饱和温度计和角闪石全铝压力计表明八二花岗质岩体结晶于730~754℃和19.8~20.6 km.综合寄主岩及其暗色微粒包体的岩石学、地球化学、同位素特征,晚侏罗世八二花岗质岩体可能形成于陆内伸展背景,由于软流圈物质上涌底侵,导致中下地壳变基性岩为主的源岩部分熔融,并且源区有少量幔源物质的加入,局部可能存在岩浆混合作用;暗色微粒包体是由镁铁质岩浆与长英质岩浆混合形成的.Abstract: Mafic microgranular enclaves (MMEs) are widespread in the host granitoid from the Ba'er pluton in the west of the Guangdong Province. The MMEs have variable shapes and share similar mineral compositions with their host rocks, but are not fully understood. Petrographic study, zircon U-Pb dating and geochemical data are reported for the host granitoid and its MMEs, to constrain their petrogenesis and tectonic setting. LA-ICP-MS zircon U-Pb dating results yield weighted mean 238U/206Pb ages of 160.0±1.0 Ma and 159.3±1.1 Ma for the host rocks and the MMEs, respectively. The host granitoid is characterized by high SiO2(61.04%-65.84%), K2O(1.60%-4.97%), low A/CNK(1.59-1.99), belonging to metaluminous, K-enriched I-type granitoid. Both host rocks and MMEs are enriched in LREE and LILE, and are depleted in HREE and HFSE (e.g., Nb, Ta and Ti). In addition, they also have indistinguishable Sr-Nd isotopic compositions. The granitoid has εNd(t) values of -5.73 to -5.67 and (87Sr/86Sr)i values of 0.707 63-0.707 67. The MMEs have εNd(t) values of -5.81 to -4.35 and (87Sr/86Sr)i values of 0.707 04-0.707 74. The calculated crystallization temperatures and depths of the Ba'er pluton are 730-754℃ and 16.8-20.6 km, respectively. According to comprehensive analysis of their tectonic settings as well as petrographic characteristics and geochemical data, the magma produced by partial melting of predominantly mafic middle-lower crust, with the input of minor mantle-derived materials, experienced different degrees of fractional crystallization in an intraplate extensional setting of Late Jurassic, Southeast China, which was accompanied by local magma mixing. The MMEs are generated by the mixing of the mafic magma with felsic magma.
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Key words:
- South China /
- Late Jurassic /
- mafic microgranular enclave /
- U-Pb ages /
- geochemistry
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图 1 研究区地质简图与采样点
图a据Wang et al.(2003);图b据广东省地质局(1964)1:20万地质图修改
Fig. 1. Geological schematic map of the study area and sample location
图 5 寄主岩和MMEs的TAS(a)、A/CNK-A/NK(b)和SiO2-K2O(c)图解
图b据Maniar and Piccoli(1989);图c据Rickwood(1989)
Fig. 5. TAS (a), A/NK-A/CNK(b) and SiO2-K2O(c) classification diagrams for the Ba'er pluton
图 6 寄主岩(a,b)和MMEs(c,d)的球粒陨石标准化稀土元素配分图、原始地幔标准化微量元素蛛网图
球粒陨石、原始地幔数据引自Sun and McDonough (1989)
Fig. 6. Chondrite-normalized REE patterns and primitive mantle-normalized spidergrams of host rocks (a, b) and mafic microgranular enclaves (c, d)
图 9 寄主岩及其MMEs(87Sr/86Sr)i-εNd(t)图解
晚侏罗世花岗岩数据引自Li et al.(2007),Xu et al.(2007); 晚侏罗世基性岩数据引自Meng et al. (2012),Wang et al.(2003, 2008),Gan et al.(2018)
Fig. 9. (87Sr/86Sr)i-εNd(t) diagram of granodiorites and enclaves in the Ba'er pluton
图 10 不同源岩脱水部分熔融实验获得的熔体图解
a, b据Wang et al. (2016)
Fig. 10. Experimental results of partial melts from different source rock types
图 11 ThN/YbN-NbN/ThN关系图(a)和MgO-FeOt图(b)
图a据曾认宇等(2016);图b据Zorpi et al.(1989)
Fig. 11. Diagrams of ThN/YbN-NbN/ThN (a) and MgO-FeOt (b)
表 1 暗色微粒包体及寄主岩锆石LA-MC-ICP-MS锆石U-Pb定年结果
Table 1. LA-MC-ICP-MS U-Pb zircon data of host rocks and MMEs in the Ba'er pluton
样品 同位素比值 年龄(Ma) 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 谐和
度暗色微粒包体 15YD-01-01 0.048 75 0.001 73 0.171 43 0.005 48 0.025 20 0.000 80 200 83 161 5 160 5 99% 15YD-01-02 0.048 44 0.001 68 0.169 34 0.005 52 0.025 05 0.000 81 121 88 159 5 160 5 99% 15YD-01-03 0.050 57 0.001 73 0.175 49 0.005 56 0.024 96 0.000 79 220 80 164 5 159 5 96% 15YD-01-04 0.062 78 0.002 16 0.235 91 0.008 60 0.027 07 0.000 89 702 69 215 7 172 6 77% 15YD-01-05 0.048 68 0.001 59 0.171 59 0.006 36 0.025 31 0.000 93 132 76 161 6 161 6 99% 15YD-01-06 0.056 48 0.002 00 0.195 18 0.007 86 0.024 54 0.000 87 472 78 181 7 156 6 85% 15YD-01-07 0.049 12 0.001 57 0.170 61 0.005 59 0.025 03 0.000 81 154 79 160 5 159 5 99% 15YD-01-08 0.050 64 0.001 57 0.176 22 0.005 67 0.025 05 0.000 80 233 72 165 5 160 5 96% 15YD-01-09 0.048 92 0.001 50 0.171 27 0.005 54 0.025 24 0.000 81 143 68 161 5 161 5 99% 15YD-01-10 0.049 35 0.001 51 0.173 05 0.005 67 0.025 31 0.000 83 165 68 162 5 161 5 99% 15YD-01-11 0.055 85 0.001 72 0.236 32 0.007 67 0.030 77 0.001 02 456 73 215 6 195 6 90% 15YD-01-12 0.049 60 0.001 50 0.170 01 0.005 74 0.024 76 0.000 83 176 75 159 5 158 5 98% 15YD-01-13 0.049 52 0.001 51 0.169 98 0.005 62 0.024 85 0.000 81 172 72 159 5 158 5 99% 15YD-01-14 0.051 21 0.001 54 0.174 78 0.006 14 0.024 72 0.000 87 250 64 164 5 157 6 96% 15YD-01-15 0.050 77 0.001 58 0.173 91 0.005 70 0.024 86 0.000 79 232 68 163 5 158 5 97% 15YD-01-16 0.051 46 0.001 63 0.176 06 0.005 72 0.024 86 0.000 78 261 72 165 5 158 5 96% 15YD-01-17 0.052 49 0.001 60 0.177 49 0.005 91 0.024 47 0.000 78 306 70 166 5 156 5 93% 15YD-01-18 0.048 62 0.001 50 0.168 70 0.005 52 0.025 26 0.000 83 128 79 158 5 161 5 98% 15YD-01-19 0.048 39 0.001 48 0.168 50 0.005 39 0.025 34 0.000 81 117 72 158 5 161 5 97% 15YD-01-20 0.051 52 0.001 63 0.175 91 0.006 10 0.024 70 0.000 79 265 77 165 5 157 5 95% 15YD-01-21 0.049 32 0.001 50 0.170 00 0.005 39 0.025 02 0.000 78 165 66 159 5 159 5 99% 15YD-01-22 0.050 12 0.001 55 0.174 11 0.006 77 0.025 15 0.000 94 211 103 163 6 160 6 98% 15YD-01-23 0.051 20 0.001 57 0.176 91 0.005 67 0.025 04 0.000 78 250 72 165 5 159 5 96% 15YD-01-24 0.049 35 0.001 52 0.170 99 0.005 61 0.025 09 0.000 79 165 68 160 5 160 5 99% 15YD-01-25 0.049 51 0.001 55 0.171 77 0.005 75 0.025 14 0.000 81 172 72 161 5 160 5 99% 寄主岩 15YD-02-01 0.049 51 0.001 50 0.172 49 0.005 95 0.025 21 0.000 87 172 72 162 5 161 6 99% 15YD-02-02 0.049 25 0.001 49 0.170 60 0.005 68 0.025 07 0.000 83 167 70 160 5 160 5 99% 15YD-02-03 0.049 61 0.001 51 0.172 01 0.006 03 0.025 11 0.000 87 176 75 161 5 160 6 99% 15YD-02-04 0.049 74 0.001 50 0.171 74 0.005 57 0.024 98 0.000 81 183 70 161 5 159 5 98% 15YD-02-05 0.049 53 0.001 49 0.171 95 0.005 50 0.025 13 0.000 80 172 70 161 5 160 5 99% 15YD-02-06 0.049 67 0.001 50 0.173 23 0.005 41 0.025 25 0.000 78 189 73 162 5 161 5 99% 15YD-02-07 0.048 95 0.001 49 0.170 42 0.005 71 0.025 19 0.000 84 146 72 160 5 160 5 99% 15YD-02-08 0.049 65 0.001 52 0.175 23 0.006 61 0.025 35 0.000 90 189 75 164 6 161 6 98% 15YD-02-09 0.050 96 0.001 54 0.175 56 0.006 02 0.025 05 0.000 87 239 69 164 5 160 6 97% 15YD-02-10 0.049 54 0.001 49 0.173 01 0.005 56 0.025 31 0.000 81 172 70 162 5 161 5 99% 15YD-02-11 0.049 24 0.001 51 0.170 56 0.005 55 0.025 11 0.000 80 167 70 160 5 160 5 99% 15YD-02-12 0.049 42 0.001 49 0.171 24 0.005 71 0.025 14 0.000 84 169 70 161 5 160 5 99% 15YD-02-13 0.059 55 0.001 89 0.201 13 0.007 03 0.024 45 0.000 81 587 69 186 6 156 5 82% 15YD-02-14 0.049 14 0.001 49 0.170 14 0.005 52 0.025 13 0.000 81 154 75 160 5 160 5 99% 15YD-02-15 0.049 67 0.001 56 0.172 44 0.005 68 0.025 23 0.000 80 189 72 162 5 161 5 99% 15YD-02-16 0.049 50 0.001 49 0.172 66 0.005 76 0.025 32 0.000 84 172 70 162 5 161 5 99% 15YD-02-17 0.048 88 0.001 62 0.167 92 0.005 85 0.025 09 0.000 83 143 78 158 5 160 5 98% 15YD-02-18 0.049 98 0.001 52 0.173 58 0.005 80 0.025 26 0.000 84 195 72 163 5 161 5 98% 15YD-02-19 0.049 24 0.001 48 0.169 73 0.005 47 0.025 05 0.000 81 167 70 159 5 160 5 99% 15YD-02-20 0.049 38 0.001 49 0.171 95 0.005 72 0.025 30 0.000 84 165 68 161 5 161 5 99% 15YD-02-21 0.049 65 0.001 50 0.171 56 0.005 70 0.025 09 0.000 82 189 75 161 5 160 5 99% 15YD-02-22 0.049 56 0.001 50 0.171 71 0.005 86 0.025 18 0.000 85 176 70 161 5 160 5 99% 15YD-02-23 0.050 87 0.001 56 0.175 94 0.005 91 0.025 10 0.000 83 235 72 165 5 160 5 97% 15YD-02-24 0.049 24 0.001 49 0.171 56 0.005 61 0.025 26 0.000 82 167 70 161 5 161 5 99% 15YD-02-25 0.049 77 0.001 51 0.172 53 0.006 02 0.025 16 0.000 88 183 66 162 5 160 6 99% 表 2 暗色微粒包体及寄主岩主量元素(%)、微量元素(10-6)和Sr-Nd同位素组成分析结果
Table 2. Major oxides (%), trace elements (10-6) and Sr-Nd isotopic results of host rocks and MMEs in the Ba'er pluton
样品 YD-01C YD-01D YD-01E YD-01F YD-01G YD-02A YD-02B YD-02C YD-02D YD-02E 岩性 暗色微粒包体 寄主岩 SiO2 55.53 57.08 56.44 55.26 56.42 65.84 63.94 61.04 65.98 63.73 TiO2 1.29 1.16 1.22 1.12 1.25 0.74 0.55 0.98 0.72 0.66 Al2O3 17.83 17.36 17.37 16.83 17.23 15.10 16.81 16.07 15.47 16.34 CaO 6.50 6.18 6.42 6.99 6.50 4.54 3.47 4.81 4.52 3.87 FeOt 8.68 8.15 8.46 8.54 8.55 5.69 4.62 7.41 5.28 5.42 K2O 2.04 1.79 1.80 2.25 1.76 1.60 4.97 2.34 1.79 3.97 MgO 2.79 2.84 2.96 4.02 2.98 1.85 1.51 2.45 1.68 1.71 MnO 0.14 0.16 0.16 0.21 0.17 0.11 0.09 0.14 0.10 0.10 Na2O 3.91 3.93 3.93 3.33 3.90 3.56 3.17 3.56 3.66 3.34 P2O5 0.29 0.27 0.30 0.27 0.30 0.23 0.18 0.30 0.21 0.21 LOI 0.70 0.79 0.64 0.89 0.66 0.49 0.41 0.61 0.33 0.37 Total 99.70 99.71 99.70 99.70 99.70 99.73 99.72 99.72 99.73 99.72 Mg# 43 45 45 52 45 43 43 43 43 42 A/CNK 0.87 0.88 0.86 0.82 0.86 0.95 1.00 0.94 0.96 0.97 A/NK 2.06 2.07 2.06 2.13 2.07 1.99 1.59 1.91 1.95 1.67 Li 85.01 91.64 88.74 75.77 82.12 77.96 60.77 95.46 64.63 61.73 Be 2.28 2.29 3.11 3.90 2.41 4.02 3.64 4.17 3.86 3.98 Sc 20.23 18.79 21.05 22.12 19.19 13.01 11.32 16.69 12.36 12.67 V 214.08 186.56 192.97 189.19 193.03 100.51 85.71 129.97 95.80 97.29 Cr 11.31 12.41 7.26 34.95 8.09 13.23 16.95 20.55 10.37 11.47 Co 22.67 22.00 21.59 24.81 22.17 12.57 9.74 16.57 11.68 11.57 Ni 6.60 7.64 6.34 17.83 6.57 6.25 5.51 13.64 5.45 4.82 Cu 21.38 28.47 27.31 28.20 28.68 11.03 6.56 12.16 6.68 7.13 Zn 145.90 143.76 144.54 133.97 138.40 97.36 82.46 123.55 88.49 87.27 Ga 21.94 21.40 21.01 20.86 20.80 19.81 17.66 21.02 19.40 18.30 Rb 127.99 149.81 145.66 120.19 138.23 113.00 167.92 158.16 119.28 163.05 Sr 516.70 440.97 446.41 428.97 441.45 383.59 445.22 390.81 397.78 431.19 Y 31.06 27.91 29.88 33.07 31.34 27.31 16.68 32.46 27.77 21.26 Zr 231.07 222.79 198.25 163.96 210.34 234.43 201.91 303.35 212.46 207.94 Nb 13.67 13.00 14.33 16.70 14.61 15.02 9.63 18.94 14.76 12.07 Cs 9.34 11.82 11.30 6.88 11.26 8.01 8.33 11.15 9.36 9.70 Ba 538.47 240.85 316.04 461.07 253.69 150.31 1064.07 284.51 200.39 720.25 La 38.32 45.51 45.36 27.14 42.23 60.87 32.81 47.87 40.86 39.56 Ce 77.87 84.96 87.67 61.15 85.01 109.52 61.45 95.27 76.19 70.96 Pr 9.24 9.16 10.03 7.46 9.84 11.36 6.26 10.72 8.51 7.66 Nd 34.37 34.09 36.49 30.41 37.33 37.30 21.95 38.62 29.75 24.74 Sm 6.86 6.00 7.10 6.62 7.19 6.71 3.57 6.98 5.78 4.67 Eu 1.70 1.49 1.70 1.48 1.70 1.37 0.91 1.61 1.29 1.06 Gd 6.54 5.98 6.70 6.51 6.73 5.99 3.30 6.69 5.32 3.72 Tb 0.97 0.90 0.99 0.96 1.03 0.92 0.50 1.03 0.82 0.63 Dy 5.19 4.74 5.30 5.49 5.50 4.59 2.61 5.78 4.38 3.21 Ho 1.01 0.90 1.03 1.08 1.06 0.92 0.56 1.12 0.87 0.62 Er 2.89 2.65 2.92 3.16 2.97 2.69 1.58 3.16 2.50 1.95 Tm 0.41 0.35 0.40 0.46 0.40 0.39 0.23 0.46 0.35 0.28 Yb 2.53 2.22 2.56 3.05 2.64 2.47 1.49 3.02 2.38 1.83 Lu 0.38 0.34 0.40 0.45 0.39 0.39 0.24 0.45 0.36 0.30 Hf 5.21 5.02 4.74 3.88 5.11 5.90 4.93 7.68 4.89 4.80 Ta 0.80 0.75 0.95 0.85 1.26 1.77 0.95 2.02 1.69 1.16 W 1.04 0.86 0.73 1.13 1.42 0.50 0.77 1.13 0.66 0.51 Tl 0.64 0.76 0.77 0.60 0.76 0.61 0.84 0.88 0.59 0.76 Pb 12.92 14.15 14.65 12.71 14.77 14.00 26.35 14.71 13.48 19.56 Bi 0.21 0.25 0.26 0.19 0.23 0.24 0.18 0.22 0.22 0.19 Th 8.82 10.92 10.70 6.77 10.35 25.51 16.23 22.35 17.88 16.96 U 2.06 2.54 2.77 1.93 2.46 6.35 4.60 6.72 5.25 4.77 Eu* 0.78 0.76 0.75 0.69 0.75 0.66 0.81 0.72 0.71 0.78 Tzr(℃) 746 732 754 737 730 ∑REE 188.28 199.29 208.66 155.41 204.01 245.49 137.46 222.78 179.34 161.20 LREE 168.35 181.21 188.36 134.27 183.29 227.13 126.96 201.07 162.37 148.65 HREE 19.92 18.07 20.30 21.14 20.71 18.36 10.50 21.71 16.97 12.55 LREE/HREE 8.45 10.03 9.28 6.35 8.85 12.37 12.09 9.26 9.57 11.85 (La/Yb)N 10.85 14.73 12.70 6.39 11.47 17.67 15.80 11.38 12.29 15.47 Rb/Sr 0.25 0.34 0.33 0.28 0.31 0.29 0.38 0.40 0.30 0.38 Nb/Ta 17.2 17.3 15.0 19.7 11.6 8.5 10.1 9.4 8.7 10.4 87Rb/86Sr 0.436 34 0.983 16 0.852 46 0.867 79 147Sm/144Nd 0.100 26 0.106 47 0.108 69 0.117 38 87Sr/86Sr 0.708 02 0.709 93 0.709 54 0.709 60 2σ 0.000 008 0.000 008 0.000 006 0.000 006 143Nd/144Nd 0.512 316 0.512 247 0.512 254 0.512 266 2σ 0.000 006 0.000 005 0.000 003 0.000 006 (87Sr/86Sr)i 0.707 04 0.707 74 0.707 63 0.707 67 εNd(t) -4.35 -5.81 -5.73 -5.67 TDM2 (Ga) 1.12 1.28 1.30 1.40 注:LOI.烧失量; A/NK(摩尔比)=Al2O3/(Na2O+K2O); A/CNK(摩尔比)=Al2O3/(Na2O+K2O+CaO); Eu*=EuN/[(SmN×GdN)1/2]; (87Sr/86Sr)i=(87Sr/86Sr)S-(87Rb/86Sr)S×(eλt-1); λ=1.42×10-11 a-1; εSr=[(143Nd/144Nd)S/(143Nd/144Nd)CHUR-1]×10 000; εNd=[(143Nd/144Nd)S/(143Nd/144Nd)CHUR-1]×10 000; t代表样品形成时间,S代表样品,CHUR代表球粒陨石; (147Sm/144Nd)CHUR=0.196 7; (143Nd/144Nd)CHUR=0.512 638 表 3 暗色微粒包体和寄主岩中斜长石的电子探针数据(%)
Table 3. EMPA results (%) of plagioclases in MMEs and host rocks
Samples SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O Total Si Al Ca Na K Or Ab An 暗色微粒包体 15YD-01-2-1 59.54 0.00 25.10 0.08 0.00 0.00 6.91 7.69 0.14 99.47 2.67 1.33 0.33 0.67 0.01 0.80 66.28 32.91 15YD-01-2-2 59.30 0.00 24.64 0.16 0.04 0.00 7.01 7.62 0.15 98.91 2.68 1.31 0.34 0.67 0.01 0.86 65.73 33.42 15YD-01-2-3 59.78 0.02 25.41 0.03 0.01 0.00 7.11 7.57 0.17 100.10 2.66 1.33 0.34 0.65 0.01 0.96 65.18 33.86 15YD-01-2-4 59.24 0.03 25.06 0.10 0.01 0.00 7.30 7.50 0.19 99.42 2.66 1.33 0.35 0.65 0.01 1.06 64.35 34.60 15YD-01-2-5 58.86 0.00 25.46 0.09 0.01 0.02 7.38 7.82 0.20 99.83 2.64 1.35 0.35 0.68 0.01 1.07 65.01 33.91 15YD-01-2-6 59.87 0.00 25.14 0.15 0.02 0.01 6.97 7.68 0.23 100.06 2.67 1.32 0.33 0.66 0.01 1.31 65.71 32.98 15YD-01-2-7 59.04 0.00 24.81 0.16 0.02 0.02 7.05 7.55 0.19 98.84 2.67 1.32 0.34 0.66 0.01 1.07 65.25 33.68 15YD-01-3-1 59.55 0.00 25.32 0.00 0.00 0.00 7.42 7.80 0.19 100.28 2.65 1.33 0.35 0.67 0.01 1.01 64.87 34.12 15YD-01-3-2 58.98 0.00 25.41 0.10 0.00 0.01 7.49 7.39 0.23 99.60 2.65 1.34 0.36 0.64 0.01 1.31 63.25 35.44 15YD-01-3-3 56.90 0.00 26.59 0.11 0.00 0.00 8.83 6.60 0.12 99.15 2.57 1.42 0.43 0.58 0.01 0.69 57.10 42.21 15YD-01-3-4 58.57 0.00 26.38 0.10 0.00 0.00 8.08 7.05 0.11 100.29 2.61 1.39 0.39 0.61 0.01 0.62 60.85 38.54 15YD-01-3-5 59.36 0.00 25.34 0.11 0.00 0.03 7.31 7.60 0.12 99.87 2.65 1.34 0.35 0.66 0.01 0.68 64.86 34.46 15YD-01-3-6 59.10 0.00 25.31 0.14 0.01 0.01 7.56 7.66 0.14 99.92 2.65 1.34 0.36 0.66 0.01 0.77 64.19 35.04 15YD-01-3-7 59.17 0.00 25.14 0.07 0.00 0.00 7.39 7.67 0.12 99.56 2.66 1.33 0.36 0.67 0.01 0.64 64.83 34.53 15YD-01-3-8 60.55 0.00 24.75 0.16 0.04 0.01 6.41 8.30 0.15 100.37 2.69 1.30 0.31 0.71 0.01 0.83 69.50 29.67 寄主岩 15YD-02-2-1 60.53 0.07 24.63 0.05 0.00 0.00 6.46 8.11 0.12 99.98 2.70 1.29 0.31 0.70 0.01 0.69 68.98 30.34 15YD-02-2-2 60.60 0.01 24.65 0.09 0.00 0.00 6.39 8.16 0.18 100.08 2.70 1.29 0.30 0.70 0.01 0.99 69.13 29.88 15YD-02-2-3 60.45 0.00 24.62 0.00 0.02 0.00 6.50 8.06 0.15 99.79 2.70 1.29 0.31 0.70 0.01 0.84 68.60 30.56 15YD-02-2-4 58.32 0.00 25.68 0.15 0.05 0.01 8.18 7.28 0.15 99.83 2.62 1.36 0.39 0.63 0.01 0.85 61.17 37.98 15YD-02-2-5 57.86 0.00 26.22 0.05 0.00 0.02 8.37 6.83 0.14 99.50 2.60 1.39 0.40 0.60 0.01 0.81 59.16 40.03 15YD-02-2-6 57.97 0.01 26.03 0.06 0.03 0.00 8.28 6.98 0.11 99.48 2.61 1.38 0.40 0.61 0.01 0.63 60.03 39.35 15YD-02-2-7 58.57 0.00 25.82 0.02 0.00 0.04 7.46 7.28 0.09 99.28 2.63 1.37 0.36 0.63 0.00 0.50 63.53 35.97 15YD-02-2-8 59.75 0.00 25.05 0.15 0.01 0.00 7.01 7.45 0.12 99.54 2.67 1.32 0.34 0.65 0.01 0.68 65.34 33.99 15YD-02-1-1 59.78 0.01 25.01 0.06 0.00 0.00 7.09 7.90 0.07 99.92 2.67 1.32 0.34 0.68 0.00 0.39 66.59 33.02 15YD-02-1-2 59.59 0.00 25.16 0.04 0.00 0.04 7.03 7.65 0.13 99.65 2.67 1.33 0.34 0.66 0.01 0.76 65.82 33.42 15YD-02-1-3 58.44 0.01 25.92 0.09 0.00 0.00 7.93 7.31 0.11 99.81 2.62 1.37 0.38 0.64 0.01 0.62 62.13 37.25 15YD-02-1-4 58.61 0.00 26.22 0.00 0.00 0.00 7.96 7.20 0.08 100.07 2.62 1.38 0.38 0.62 0.00 0.47 61.78 37.74 15YD-02-1-5 60.38 0.03 24.61 0.01 0.12 0.03 6.64 7.99 0.09 99.88 2.69 1.29 0.32 0.69 0.00 0.49 68.22 31.30 15YD-02-2-1 58.49 0.00 25.96 0.01 0.00 0.00 7.95 6.93 0.09 99.43 2.63 1.37 0.38 0.60 0.01 0.51 60.91 38.58 15YD-02-1-2 58.78 0.01 26.02 0.02 0.01 0.00 7.82 7.18 0.15 99.97 2.63 1.37 0.37 0.62 0.01 0.85 61.88 37.27 15YD-02-1-3 59.24 0.04 25.56 0.11 0.00 0.00 7.70 7.46 0.19 100.29 2.64 1.34 0.37 0.64 0.01 1.08 63.00 35.93 表 4 暗色微粒包体和寄主岩中角闪石电子探针分析结果(%)
Table 4. EMPA results(%) of hornblendes in enclaves and host rocks
Samples 15YD-
01-2-115YD-
01-2-215YD-
01-3-115YD-
01-3-215YD-
02-2-115YD-
02-2-2暗色微粒包体 寄主岩 SiO2 42.24 42.36 42.41 42.28 41.99 42.27 TiO2 0.85 0.86 0.91 0.92 0.83 0.84 Al2O3 10.46 10.66 10.53 10.71 10.98 10.81 FeO 20.74 20.22 20.87 20.39 21.13 21.28 MnO 0.60 0.64 0.52 0.51 0.55 0.78 MgO 8.12 8.58 8.25 8.50 8.05 7.96 CaO 11.36 11.56 11.59 11.71 11.52 11.63 Na2O 0.32 0.41 0.39 0.36 0.33 0.32 K2O 1.32 1.17 1.41 1.18 1.06 1.22 以23个O计算的阳离子数 Si 6.45 6.42 6.43 6.41 6.37 6.39 Al IV 1.55 1.58 1.57 1.59 1.63 1.61 Al VI 0.33 0.32 0.32 0.32 0.33 0.32 Ti 0.10 0.10 0.10 0.11 0.10 0.10 Fe3+ 0.96 0.96 0.89 0.92 1.06 1.00 Fe2+ 1.69 1.60 1.76 1.66 1.62 1.69 Mn 0.08 0.08 0.07 0.07 0.07 0.10 Mg 1.85 1.94 1.87 1.92 1.82 1.80 Ca 1.86 1.88 1.88 1.90 1.87 1.88 Na 0.09 0.12 0.11 0.11 0.10 0.09 K 0.26 0.23 0.27 0.23 0.20 0.23 P (kbar) 5.94 6.05 5.95 6.10 6.34 6.16 H (km) 19.63 20.12 19.62 19.96 20.91 20.32 -
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