DETERMINATION OF THE XIAMEN OPHIOLITE MELANGE IN THE EASTERN SECTION OF LAJI MOUNTAIN, QINGHAI PROVINCE: Tectonic Implication
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摘要:
在拉脊山东段青海省民和县峡门镇以南地区新识别出一条蛇绿混杂岩带, 其物质组成复杂, 构造岩块主要由蛇绿岩岩块、外来岩块、火山岩岩块以及变沉积岩岩块组成. 基性火山熔岩和辉绿岩具轻稀土富集的"右倾"配分模式, 大离子亲石元素Ba、Th、Sr相对富集, 高场强元素P、Ti、Nb相对亏损, 总体岩石地球化学特征与岛弧拉斑玄武岩类似. 岩石学、岩石地球化学、同位素年代学特征及区域资料综合研究认为, 峡门蛇绿岩属与俯冲有关的SSZ型蛇绿岩, 很可能是早古生代原特提斯洋俯冲消减的弧后小洋盆, 属于弧后盆地扩张型蛇绿岩.
Abstract:An ophiolite melange belt with complex material compositions is newly identified in Xiamen Town in the eastern section of Laji Mountain, Qinghai Province. The tectonic blocks are mainly composed of ophiolites, exotic blocks, volcanic rocks and meta-sedimentary rocks. The basic volcanic lava and diabase are characterized by right-dipping LREE enrichment patterns, enrichment of LILEs (Ba, Th and Sr), and depletion of HFSEs (P, Ti and Nb), with the general petrogeochemistry similar to that of island-arc tholeiite. The comprehensive study of petrology, petrogeochemistry, isotope chronology and regional geology show that the Xiamen ophiolite is of supra-subduction zone (SSZ) type, which is probably a back-arc small ocean basin formed by Early Paleozoic Proto-Tethyan Ocean subduction, belonging to back-arc basin spreading ophiolite.
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Key words:
- Laji Mountain /
- ophiolite melange /
- petrogeochemistry /
- SSZ-type ophiolite /
- tectonic setting /
- Qinghai Province
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表 1 峡门蛇绿岩主量元素分析结果
Table 1. Contents of major elements in Xiamen ophiolite
样品号 GS345
1-1GS345
1-2Pm31GS
12-1Pm31GS
14-1Pm31GS
14-2Pm02GS
25-1QIVG
S05Pm02GS
23-1Pm02G
S01Pm20GS
20-1Pm20GS
70-1GS327
6-1岩性 超镁铁质岩类 镁铁质岩类 基性岩（席）及基性火山熔岩 蛇纹石化橄榄岩 斜辉橄榄岩 辉石岩 蛇纹岩 辉长岩 辉绿岩 蚀变玄武岩 SiO2 33.59 33.42 39.1 37.6 39.5 46.45 48.88 45.86 49.55 46.36 46.11 50.64 TiO2 0.02 0.02 0.05 0.01 0.03 1.38 0.1 0.26 0.2 0.82 1.73 0.37 Al2O3 0.23 0.22 0.7 0.19 0.27 14.52 15.5 5.46 3.06 17.56 14.03 16.85 Fe2O3 7.08 6.61 7.32 8.43 6.98 3.65 1.24 1.76 4.05 4.76 5.61 5.24 FeO 1.2 1.05 3 2.3 2.4 6.4 4.97 8.05 6.93 6.4 6.65 6.85 MnO 0.11 0.1 0.15 0.19 0.11 0.17 0.16 0.23 0.18 0.19 0.17 0.21 MgO 38.37 38.74 36.97 37.04 37.99 6.58 12.26 15.98 20.33 4.77 4.47 5.32 CaO 0.13 0.13 0.47 1.28 0.35 8.63 10.48 14.78 15.36 9.95 8.87 8.12 Na2O 0.15 0.14 0.13 0.13 0.11 3.13 1.84 0.41 0.24 3.58 3.76 1.86 K2O 0.01 0.01 0.02 0.03 0.05 0.54 0.71 0.54 0.06 0.39 0.55 0.03 P2O5 0.02 0.02 0.01 0.01 0.01 0.17 0.01 0.03 0.03 0.14 0.24 0.04 H2O+ 4.74 3.73 0.47 1.04 0.37 3.79 0.23 2.79 3.97 1.69 4.51 0.07 CO2 9.81 9.68 10.96 11.1 11.2 4.36 3.26 3.56 3.38 3.16 3.05 4.02 LOI 18.54 19 11.47 12.33 11.68 7.49 3.1 5.49 4.19 6.86 3.54 总量% 99.46 99.46 99.4 99.56 99.49 99.09 99.26 98.84 99.99 99.12 99.07 99.07 K2O/Na2O 0.07 0.08 0.17 0.26 0.42 0.17 0.38 1.32 0.25 0.11 0.15 0.02 Mg# 94.39 94.88 91.7 92.04 92.84 59.85 79.97 76.48 80.88 50.54 47.21 51.4 TFeO 9.35 8.7 10.91 11.33 9.89 10.57 6.33 10.32 10.58 11.25 12.68 12.1 含量单位：%. 
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表 2 峡门蛇绿岩稀土元素和微量元素分析结果
Table 2. Contents of REEs and trace elements in Xiamen ophiolite
样品号 GS34
51-1GS34
51-2Pm31GS
12-1Pm31GS
14-1Pm31GS
14-2Pm02GS
25-1QIVG
S05Pm02GS
23-1Pm02G
S01Pm20GS
20-1Pm20GS
70-1GS32
76-1岩性 超镁铁质岩类 镁铁质岩类 基性岩（席）及基性火山熔岩 蛇纹石化橄榄岩 斜辉橄榄岩 辉石岩 蛇纹岩 辉长岩 辉绿岩 玄武岩 La 1.01 1.92 2.23 1.11 0.74 13.61 0.82 2.46 1.83 14.30 15.13 1.97 Ce 0.78 1.52 2.40 1.14 1.16 29.37 1.61 4.88 3.42 23.62 29.51 3.21 Pr 0.29 0.52 0.48 0.25 0.14 4.06 0.17 0.76 0.48 3.59 4.16 0.53 Nd 1.19 2.13 1.75 0.88 0.56 18.39 0.81 3.58 2.00 15.20 18.97 2.49 Sm 0.26 0.45 0.39 0.17 0.11 4.38 0.25 0.94 0.55 3.41 4.90 0.83 Eu 0.07 0.11 0.11 0.05 0.02 1.43 0.16 0.31 0.19 1.22 1.68 0.30 Gd 0.21 0.37 0.42 0.15 0.09 4.78 0.36 1.10 0.60 3.48 5.50 1.20 Tb 0.03 0.06 0.06 0.02 0.02 0.83 0.07 0.20 0.10 0.53 0.91 0.23 Dy 0.22 0.37 0.37 0.12 0.09 5.01 0.47 1.20 0.67 3.46 6.10 1.75 Ho 0.05 0.07 0.08 0.02 0.02 1.01 0.10 0.25 0.14 0.74 1.29 0.42 Er 0.14 0.21 0.22 0.06 0.05 2.88 0.30 0.74 0.38 2.11 3.64 1.37 Tm 0.02 0.03 0.04 0.01 0.01 0.42 0.05 0.11 0.05 0.30 0.53 0.22 Yb 0.13 0.19 0.24 0.06 0.05 2.64 0.28 0.75 0.32 1.89 3.19 1.46 Lu 0.02 0.03 0.04 0.01 0.01 0.38 0.05 0.12 0.05 0.30 0.49 0.25 Sr 4.3 6.25 6.24 7.8 6.52 249.6 140.2 43.66 35.08 237.7 420.6 197.8 Rb 0.4 1.69 1.39 2.38 3.67 10.08 23.65 6.98 2 5.18 5.74 0.88 Ba 64.4 32.1 8.65 49.78 9.16 193.8 56.07 393.4 52.44 122.5 203.3 32.78 Th 0.34 0.85 0.45 0.36 0.34 2.19 2.39 0.53 0.34 2.04 2.53 0.62 Ta 0 0.1 0.05 0.1 0.08 0.97 1.39 0.24 0.17 0.92 0.8 0.25 Nb 0.52 1.1 0.39 0.39 0.6 10.26 3.58 1.77 1.86 7.19 11.33 1.68 Zr 6.8 6.1 5.45 5.54 4.95 144.9 7.92 18.3 11.48 54 140.5 19 Hf 0.7 0.6 0.26 0.6 0.17 4.5 0.77 0.7 0.77 1.5 3.8 0.6 Cr 3422 2589 3688 3711 2366 247.1 415.1 971.7 1579 82.59 81.82 56.36 Ni 2377 2464 928.3 1100 1069 - 161 - 374.5 23.77 45.96 27.93 Co - - - - - 39.13 - 65.44 - - - - V 0.06 0.04 0.1 0.15 0.15 0.43 0.05 0.07 0.08 0.44 0.57 0.19 Y 1.28 1.97 2.13 0.57 0.55 24.56 2.77 6.23 3.48 18.78 31.08 10.56 ∑REE 4.41 7.97 8.83 4.05 3.07 89.18 5.5 17.38 10.78 74.13 95.99 16.21 LREE 3.59 6.65 7.36 3.6 2.73 71.24 3.82 12.92 8.47 61.34 74.36 9.32 HREE 0.82 1.33 1.47 0.45 0.34 17.94 1.68 4.46 2.31 12.79 21.63 6.9 LREE/HREE 4.38 5.01 5.01 8 8.03 3.97 2.27 2.9 3.67 4.8 3.44 1.35 (La/Yb)N 5.21 6.79 6.26 12.47 9.98 3.48 1.97 2.23 3.86 5.11 3.2 0.91 δEu 0.86 0.78 0.83 0.94 0.6 0.95 1.63 0.94 1.01 1.07 0.99 0.92 (La/Sm)N 2.49 2.71 3.6 4.11 4.23 1.95 2.06 1.65 2.09 2.64 1.94 1.5 (Gd/Yb)N 1.27 1.54 1.41 2.02 1.45 1.46 1.04 1.19 1.51 1.49 1.39 0.66 含量单位:10-6.
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