Mineral Chemical Characteristics and Geodynamic Significance of Olivine Gabbro from the Zhijiaqiao Area, Yugan County, Jiangxi Province
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摘要:
橄榄辉长岩起源于岩石圈地幔，其中的造岩矿物的结构和成分特征与岩石成因密切相关，可以反映岩浆源区特征、结晶的物理化学条件以及地球动力学背景。本文对产于华夏地块的江西余干支家桥橄榄辉长岩开展了岩相学和矿物化学分析以探讨其形成的背景。该橄榄辉长岩的造岩矿物由单斜辉石、斜长石、橄榄石及少量角闪石和金云母等组成。橄榄石为他形粒状，边缘发育蛇纹石化，Fo=80.68～82.20，属贵橄榄石，CaO含量低于0.1 wt.%，指示其为地幔捕虏晶；单斜辉石为透辉石和普通辉石，Mg#=82.52～85.95，矿物成分计算表明岩体的母岩浆为钙碱性玄武质岩浆，结晶温度为
1173 ～1193 ℃，结晶压力为0.25～0.39 GPa。橄榄辉长岩中富含含水矿物及单斜辉石结晶时岩浆含水量（2.1%～2.7%）指示其母岩浆具有富水的特征，可能其岩浆源区受到过俯冲流体的交代改造。结合区域地质背景认为支家桥地区橄榄辉长岩可能是受俯冲流体交代过的岩石圈地幔在新生代伸展背景下发生减压熔融，形成橄榄辉长岩的母岩浆，母岩浆上升侵位于中下地壳的产物。Abstract:Olivine gabbro originates from the mantle lithosphere, with the structural and compositional characteristics of its rock-forming minerals closely related to its petrogenesis, reflecting the characteristics of the magma source region, the physicochemical conditions of crystallization, and the geodynamic background. This paper conducts the petrographic and mineral chemical analyses on the olivine gabbro from the Zhijiaqiao area in the Cathaysia Block, to explore its formation background. The rock-forming minerals of this olivine Gabbro consist of clinopyroxene, plagioclase, olivine, and a small amount of hornblende and phlogopite. Olivine is xenomorphic granular and developing serpentinization alteration edge. With the Fo values of 80.68～82.20, it belongs to the chrysolite, CaO content is less than 0.1 wt.%, indicated as mantle xenocrysts. The clinopyroxene is composed of diopside and augite. with Mg#=82.52～85.95. Mineral composition calculations indicate that the parent magma is calc-alkaline basaltic magma, with a crystallization temperature range of
1173 ～1193 ℃ and a crystallization pressure of 0.25～0.39 GPa. The richness in hydrous minerals and the water content (2.1%～2.7%) of the clinopyroxene in the olivine gabbro indicate that its parent magma is water-rich, possibly due to metasomatism by subduction-related fluids in the magma source region. Combined with the regional geological background, it is believed that the olivine gabbro in the Zhijiaqiao area may have originated from lithospheric mantle metasomatized by subduction fluids. Under the extensional tectonic setting of the Cenozoic, this mantle has undergone decompression melting, forming the parent magma of the olivine gabbro, which ascended and intruded into the middle-lower crust.-
Key words:
- clinopyroxene /
- olivine /
- moisture capacity /
- geodynamic significance /
- the Zhijiaqiao area
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表 1 支家桥橄榄辉长岩中橄榄石化学组成电子探针分析结果（wt.%）及相关参数
Table 1. Electron microprobe analysis results (wt.%) and related parameters of olivine chemical composition in Zhijiaqiao olivine gabbro
ZJQ16-2-4 ZJQ16-2-7 ZJQ16-2-9 ZJQ16-3-11 ZJQ16-3-15 ZJQ16-3-22 ZJQ16-3-23 ZJQ16-3-24 ZJQ16-3-25 ZJQ16-3-27 SiO2 38.64 38.71 38.26 38.73 38.61 38.68 38.78 38.54 38.81 38.37 TiO2 0 0 0 0.04 0 0.03 0 0 0 0.01 Al2O3 0.03 0.04 0.01 0.01 0.03 0 0.01 0 0.02 0.01 Cr2O3 0.04 0 0.02 0 0.02 0 0.02 0 0 0.02 FeO 17.29 17.64 17.26 17.92 17.98 17.31 17.09 17.04 16.55 17.29 MnO 0.25 0.24 0.24 0.24 0.29 0.3 0.19 0.27 0.25 0.3 MgO 42.3 42.49 42.29 42.07 42.12 42.49 42.82 42.49 42.87 42.69 CaO 0 0 0.03 0.03 0.01 0.01 0.02 0.02 0.02 0.01 Na2O 0.02 0 0.01 0 0 0.02 0 0.01 0.01 0 K2O 0.02 0 0 0.02 0 0 0.01 0.01 0 0 NiO 0.01 0.09 0.01 0.08 0.13 0.06 0.07 0.09 0.06 0.07 Total 98.58 99.21 98.11 99.14 99.2 98.89 99.01 98.47 98.59 98.77 Si 1.99 1.99 1.98 1.99 1.99 1.99 1.99 1.99 1.99 1.98 Ti 0 0 0 0 0 0 0 0 0 0 Al 0 0 0 0 0 0 0 0 0 0 Cr 0 0 0 0 0 0 0 0 0 0 Fe 0.37 0.38 0.37 0.39 0.39 0.37 0.37 0.37 0.36 0.37 Mn 0.01 0.01 0.01 0.01 0.01 0.01 0 0.01 0.01 0.01 Mg 1.63 1.63 1.63 1.61 1.62 1.63 1.64 1.64 1.64 1.64 Ca 0 0 0 0 0 0 0 0 0 0 Na 0 0 0 0 0 0 0 0 0 0 K 0 0 0 0 0 0 0 0 0 0 Fo 81.35 81.11 81.37 80.72 80.68 81.4 81.7 81.63 82.2 81.48 
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表 2 支家桥橄榄辉长岩中单斜辉石化学组成电子探针分析结果（wt.%）及相关参数
Table 2. Electron microprobe analysis results of chemical composition (wt.%) and related parameters of clinopyroxene in olivine gabbro of Zhijiaqiao
ZJQ16-2-1 ZJQ16-2-2 ZJQ16-2-3 ZJQ16-2-4 ZJQ16-2-5 ZJQ16-2-6 ZJQ16-2-7 ZJQ16-2-8 ZJQ16-2-9 ZJQ16-2-10 SiO2 51.78 51.13 52.49 51.81 52.43 53.07 51.86 51.89 51.97 52.3 TiO2 0.53 0.55 0.4 0.56 0.48 0.26 0.55 0.51 0.55 0.41 Al2O3 3.86 4.61 2.96 3.93 3.22 2.49 3.65 3.85 3.79 3.03 Cr2O3 0.14 0.11 0.03 0.21 0.23 0.09 0.09 0.03 0.18 0.11 FeO 5.24 5.69 4.83 5.8 5.33 5.27 5.72 5.47 6.99 5.28 MnO 0.15 0.18 0.11 0.16 0.16 0.17 0.2 0.16 0.2 0.17 MgO 15.55 15.27 15.48 15.63 15.54 16.29 15.97 15.2 17.24 15.57 CaO 22.36 21.92 23.37 21.4 22.51 22.34 21.71 22.38 18.62 22.9 Na2O 0.28 0.27 0.15 0.24 0.25 0.24 0.25 0.28 0.22 0.2 K2O 0 0.01 0 0 0 0 0.02 0 0.02 0.01 Total 99.9 99.75 99.81 99.74 100.15 100.22 100.01 99.77 99.82 100 Si 1.9 1.88 1.93 1.9 1.93 1.95 1.91 1.91 1.91 1.92 Aliv 0.1 0.12 0.07 0.1 0.07 0.05 0.09 0.09 0.09 0.08 Alvi 0.07 0.08 0.06 0.07 0.07 0.06 0.06 0.07 0.07 0.05 Ti 0.01 0.02 0.01 0.02 0.01 0.01 0.02 0.01 0.02 0.01 Cr 0 0 0 0.01 0.01 0 0 0 0.01 0 Fe3+ 0.02 0 0 0 0.03 0.07 0.03 0 0.03 0.01 Fe2+ 0.14 0.17 0.15 0.18 0.13 0.09 0.14 0.17 0.19 0.15 Mn 0 0.01 0 0 0 0.01 0.01 0.01 0.01 0.01 Mg 0.85 0.84 0.85 0.86 0.85 0.89 0.87 0.83 0.94 0.85 Ca 0.88 0.86 0.92 0.84 0.89 0.88 0.85 0.88 0.73 0.9 Na 0.02 0.02 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.01 K 0 0 0 0 0 0 0 0 0 0 Wo 46.39 45.92 47.93 44.78 46.5 45.37 44.73 46.7 38.62 46.91 En 44.89 44.5 44.18 45.5 44.66 46.02 45.78 44.14 49.76 44.37 Fs 8.72 9.58 7.9 9.72 8.84 8.61 9.5 9.17 11.63 8.71 Mg# 85.83 84.84 85.23 82.52 85.83 84.84 85.23 82.52 84.04 85.95
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表 3 支家桥橄榄辉长岩中单斜辉石结晶时温度、压力
Table 3. Temperature and pressure of clinopyroxene crystallization in Zhijiaqiao olivine gabbro
样号 T（℃） P（GPa） H2O（wt.%） H（km） ZJQ16-2-1 1183.2 0.30 2.6 10 ZJQ16-2-2 1178.1 0.33 2.5 11 ZJQ16-2-4 1181.2 0.31 2.1 10 ZJQ16-2-5 1179.6 0.25 2.4 8 ZJQ16-2-6 1193.5 0.30 2.6 10 ZJQ16-2-7 1173.1 0.25 2.3 8 ZJQ16-2-8 1184.1 0.33 2.7 11 ZJQ16-2-9 1187.9 0.39 2.7 13 注：假定1 GPa对应33 km深度；温压计算公式据Wang X D et al.（2021）.
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