Extremely Depleted Carbonferous N-MORB Metabasite at the Chenxing Area (Hainan) and Its Geological Significance
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摘要: 海南岛地处印支陆块和华南陆块的交界地带,具有复杂的构造演化史,其拼合机制及精细时代一直备受争议.在海南岛昌江-琼海断裂以北的晨星地区识别出一套具高εNd(t)值的火山岩,对其进行了全岩40Ar-39Ar年代学及主、微量元素和同位素地球化学研究.结果表明,该火山岩的全岩40Ar-39Ar坪年龄为328.1±2.6 Ma,代表了其喷发年龄;该变基性岩SiO2含量为46.92%~52.58%,具有低TiO2、低K2O、高Al2O3的特征;稀土元素丰度为15.1×10-6~28.7×10-6, 呈现N-MORB型微量元素配分曲线, εNd(t)高至9.02~9.85,显示出高度亏损的地球化学特征;其成因被解释为源于受流体交代作用改造的MORB型地幔源区.综合分析表明晨星地区变基性岩的形成可能与古特提斯洋陆俯冲格局下华南与印支陆块间的弧后盆地或有限洋演变有关.Abstract: Hainan Island, located between the Indochina and South China Blocks, has undergone compound structural overprinting and complex tectonic evolution. However, the Late Paleozoic tectonic regime and amalgamation history of the South China with Indochina Blocks are still on debate. Our investigation identified the highly-depleted greenschist-facies basalt at the Chenxing area in the north of the Changjiang-Qionghai fault, Central Hainan Island. This paper presents a set of new geochronological and geochemical data for these metabasites. The representative sample for Chenxing metabasites gave the plateau age of 328.1±2.6 Ma, representing the eruption age. They have SiO2 ranging from 46.92 % to 52.58 %, TiO2 from 0.48 % to 1.12% and Al2O3 from 12.34 % to 17.45 %, and could be classified as basalt. These samples show lower K2O contents, and HFSEs and REEs contents relative to N-MORB. They are characterized by the left-sloping REE pattern and multi-elemental pattern with a geochemical affinity to N-MORB. These samples show extremely high εNd(t) values ranging from 9.02 to 9.85. Such geochemical characteristics for the Chenxing metabasites show the derivation of the MORB source modified by slab-related fluid. In combination with other available data, the Chenxing metabasites in Central Hainan are formed in the back-arc basin or a restricted ocean basin between the South China and Indochina blocks during the Carboniferous in response to the subduction of the Paleotethyan main ocean.
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Key words:
- metabasites /
- Nd isotopic composition /
- N-MORB /
- Carbonferous /
- eastern paleotethyan evolution /
- geochemistry /
- petrology
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图 4 晨星变基性岩SiO2-K2O+Na2O(a)和SiO2-(Zr/TiO2)(b)关系
图a据Maitre et al.(1989);图b据Winchester and Floyd(1977)
Fig. 4. Relations of SiO2-K2O+Na2O (a) and SiO2-Zr/TiO2 (b) from the Chenxing metabasites
图 6 晨星变基性岩的球粒陨石标准化稀土元素配分模式(a)和标准化微量元素蛛网图(b)
勉略鞍子山斜长角闪岩数据来自许继峰等(1997, 2000);新元古代南桥玄武岩来自Zhang et al.(2013), 其中球粒陨石和N-MORB数据分别引自Taylor and McLennan(1995)和Sun and McDonough(1989)
Fig. 6. Chondrite-normalized REE pattern (a) and N-MORB-normalized trace element spider diagram (b) of the Chenxing metabasite
图 7 晨星地区变基性岩87Sr/86Sr(t)-εNd(t)关系
双沟和金沙江蛇绿岩数据来自Jian et al.(2009a, 2009b)
Fig. 7. Relation of 87Sr/86Sr(t)-εNd(t) from the Chenxing metabasites, Central Hainan
图 8 晨星变基性岩的Nb/La-MgO和εNd(t)-MgO关系
Fig. 8. Relations of Nb/La-MgO (a) and εNd(t)-MgO (b) from the Chenxing metabasites
图 9 晨星变基性岩的U/Th-Th(a)和Th/Yb-Ba/La(b)关系
勉略鞍子山变基性岩数据来自许继峰等(1997, 2000);新元古代南桥玄武岩来自Zhang et al.(2013)
Fig. 9. Relations of U/Th-Th (a) and Th/Yb-Ba/La (b) from the Chenxing metabasites
图 10 晨星地区变基性岩的地球化学判别关系
a.图版据Pearce and Cann(1973);b.图版据Meschede(1986);c.图版据Cabanis and Lecolle(1989);d.图版据Wood(1980).勉略鞍子山变基性岩数据来自许继峰等(1997, 2000);新元古代南桥玄武岩来自Zhang et al.(2013)
Fig. 10. Geochemical discrimination relations for the Chenxing metabasite
图 11 晨星变基性岩Ti-Zr/1 000(a), Ti/Zr-Zr(b), V-Ti/1 000(c)和(Tb/Ta)N-(Th/Ta)N(d)关系
a.图版据Pearce(1982);b.图版据Wang et al.(2013);c.图版据Shervais(1982).勉略鞍子山变基性岩数据来自许继峰等(1997, 2000);新元古代南桥玄武岩来自Zhang et al.(2013)
Fig. 11. Relations of Zr-Ti/1 000 (a), Ti/Zr-Zr (b), V-Ti/1 000 (c) and (Tb/Ta)N-(Th/Ta)N (d) from the Chenxing metabasites
表 1 晨星地区代表性变基性岩样品(11HN-48B)的全岩40Ar-39Ar同位素逐步加热结果
Table 1. Whole-rock 40Ar-39Ar isotopic analyses for incremental heating experiments for the Chenxing metabasite (11HN-48B) in Central Hainan
温度 (40Ar/36Ar)m (39Ar/36Ar)m (37Ar/39Ar)m (40*Ar/39Ar)k 40*Ar(%) 39Ark(%) 表观年龄(t±2σ)Ma 700 ℃ 415.923 85 1.129 45 0.007 08 82.172 836 19.76 0.85 390.6±34.2 750 ℃ 126.050 85 0.196 47 0.013 24 67.996 157 53.94 2.49 328.9±6.5 800 ℃ 73.232 48 0.021 10 0.001 56 66.996 182 91.48 3.69 324.5±2.0 840 ℃ 73.851 99 0.018 87 0.000 67 68.276 230 92.45 7.64 330.2±2.0 880 ℃ 70.559 04 0.008 08 0.000 35 68.171 792 96.62 23.17 329.7±2.1 910 ℃ 66.323 84 0.003 21 0.001 64 65.375 672 98.57 11.09 317.3±1.9 940 ℃ 67.343 12 0.004 38 0.000 68 66.048 891 98.08 6.78 320.3±1.9 980 ℃ 68.582 39 0.006 12 0.003 67 66.773 588 97.36 5.22 323.5±2.0 1 020 ℃ 69.910 83 0.005 65 0.002 97 68.241 524 97.61 4.62 330.0±2.0 1 060 ℃ 70.430 95 0.005 71 0.000 51 68.743 569 97.60 5.23 332.3±2.0 1 100 ℃ 69.406 28 0.004 33 0.001 10 68.127 615 98.16 8.80 329.5±2.1 1 140 ℃ 67.976 53 0.002 24 0.001 02 67.315 073 99.03 16.64 325.9±2.0 1 170 ℃ 70.676 69 0.001 93 0.004 71 70.105 585 99.19 3.09 338.3±2.0 1 220 ℃ 77.837 60 0.006 63 0.036 45 75.882 506 97.49 0.46 363.5±2.3 1 400 ℃ 92.278 05 0.025 63 0.065 83 84.715 839 91.80 0.24 401.4±32.3 注:m.样品中测定的同位素比值;*.表示放射成因;k.中子活化过程中由39K产生的39Ar. 表 2 晨星地区变基性岩主量(%)和微量元素(10-6)分析结果
Table 2. Major elements (%) and trace elements (10-6) analytical results for the Chenxing metabasite
样品 11HN-48A 11HN-48B 11HN-48C 11HN-48D 11HN-48E 11HN-48F 11HN-48G 11HN-48H SiO2 46.03 51.84 51.82 47.11 49.14 46.78 48.93 49.40 TiO2 1.12 0.48 0.55 0.56 0.52 0.63 1.09 0.61 Al2O3 17.12 12.43 12.59 14.17 13.89 16.02 14.52 12.08 TFeO 10.59 8.68 9.33 9.62 9.32 10.41 10.72 9.72 MgO 9.08 11.34 10.32 11.01 12.03 10.37 9.50 12.24 CaO 11.69 10.83 11.33 12.07 10.37 11.67 11.54 11.86 K2O 0.57 0.09 0.07 0.13 0.07 0.10 0.15 0.47 Na2O 1.64 2.78 2.72 2.34 2.44 2.44 2.08 1.28 MnO 0.19 0.12 0.13 0.15 0.14 0.16 0.17 0.18 P2O5 0.07 0.02 0.03 0.03 0.03 0.04 0.07 0.03 LOI 1.40 1.09 0.78 2.45 1.68 0.97 0.78 1.68 Total 99.51 99.70 99.67 99.63 99.63 99.58 99.54 99.54 Sc 40.60 36.50 40.60 41.00 38.50 41.00 42.60 48.00 V 293 212 239 224 225 267 298 274 Cr 476 990 1 010 974 1 140 1 170 404 743 Co 56.7 50.8 57.8 50.4 54.6 64.1 47.1 40.6 Ni 255 270 336 307 360 419 138 191 Ga 16.20 8.81 11.80 12.60 11.40 14.90 14.80 11.10 Rb 24.40 1.94 1.22 3.98 1.54 1.13 3.94 22.40 Sr 249 149 186 206 154 163 188 160 Y 18.80 13.80 16.00 14.70 15.40 19.20 20.90 20.10 Zr 49.50 23.50 27.40 25.40 25.40 28.40 50.70 31.80 Nb 1.49 0.76 0.93 0.80 0.84 1.08 1.36 0.60 Cs 1.49 0.14 0.16 5.20 0.18 0.11 0.34 1.35 Ba 78.00 44.40 49.50 51.20 57.30 53.90 39.50 70.00 La 1.64 0.85 1.14 1.08 0.95 0.98 1.93 0.75 Ce 4.35 2.43 2.97 3.10 2.61 2.98 5.04 2.60 Pr 0.82 0.44 0.50 0.50 0.52 0.53 0.91 0.54 Nd 4.91 2.24 2.81 2.89 2.56 3.11 5.45 3.44 Sm 2.07 1.00 1.15 1.18 1.12 1.24 2.14 1.35 Eu 0.77 0.45 0.60 0.47 0.47 0.56 0.89 0.60 Gd 2.84 1.51 1.83 1.77 1.69 2.02 2.96 2.16 Tb 0.49 0.30 0.37 0.35 0.33 0.40 0.53 0.43 Dy 3.21 2.10 2.58 2.40 2.37 2.90 3.43 3.04 Ho 0.68 0.48 0.59 0.54 0.53 0.66 0.74 0.69 Er 1.97 1.46 1.76 1.61 1.59 1.96 2.11 2.07 Tm 0.29 0.21 0.27 0.24 0.24 0.30 0.31 0.32 Yb 1.82 1.44 1.75 1.56 1.56 1.93 1.95 2.07 Lu 0.27 0.21 0.26 0.23 0.23 0.29 0.29 0.31 Hf 1.38 0.65 0.77 0.75 0.68 0.81 1.36 0.84 Ta 0.10 0.05 0.07 0.06 0.06 0.06 0.09 0.04 Th 0.14 0.09 0.10 0.04 0.03 0.10 0.10 0.08 U 0.16 0.07 0.20 0.11 0.16 0.12 0.18 0.21 表 3 海南岛晨星地区变基性岩的同位素分析结果
Table 3. The isotopic analytical results for the representative samples from the Chenxing metabasite
样品编号 87Rb/86Sr 147Sm/144Nd 87Sr/86Sr 2σ 143Nd/144Nd 2σ (87Sr/86Sr)i (143Nd/144Nd)i εNd(t) 11HN-48B 0.038 0.270 0.709 714 42 0.000 000 07 0.513 299 0.000 011 0.709 539 0.512 710 9.85 11HN-48D 0.029 0.265 0.709 639 92 0.000 000 11 0.513 250 0.000 008 0.709 505 0.512 669 9.02 11HN-48F 0.020 0.237 0.708 506 31 0.000 000 15 0.513 202 0.000 011 0.708 413 0.512 685 9.31 11HN-48H 0.405 0.237 0.709 639 92 0.000 000 11 0.513 211 0.000 006 0.707 749 0.512 693 9.48 -
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