Mineral Chemistry of Peridotite Xenoliths in Yangyuan Cenozoic Basalts: Significance for Lithospheric Mantle Evolution beneath the North China Craton
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摘要: 橄榄岩及其中矿物的组成, 特别是单斜辉石的微量元素, 可以很好的揭示岩石圈地幔性质.在对河北阳原新生代玄武岩中橄榄岩捕虏体详细岩相学和矿物化学研究基础上, 重点分析了单斜辉石的激光原位微量元素, 讨论了新生代华北内部山带岩石圈地幔特征及其演化机制.阳原地区陆下岩石圈, 除个别样品的部分熔融程度为15%~20%外, 多数样品<5%, 显示该区的地幔演化是不均一的, 并表现为饱满与难熔-过渡型地幔的交叉并存.这种共存现象可以用软流圈物质对古老地幔进行不均匀侵蚀、改造和置换作用来解释.Abstract: The compositions of the minerals and peridotites, especially trace elements of clinopyroxene (Cpx) can well reflect the characteristics of the subcontinental lithospheric mantle (SCLM). Based on the petrographical study of peridotite xenoliths in Yangyuan Cenozoic basalts and chemical study of minerals, the paper mainly analyzes the LAM-ICP-MS trace element com- positions of Cpx from the Yangyuan peridotitic xenoliths and discusses the nature and evolution of the Cenozoic SCLM beneath the center of the Trans-North China orogen. The SCLM beneath the Yangyuan area is heterogeneous, forming from the different partial melting of the primitive mantle: most melted less than 5% of the total, except a few among 15%-20%. The coex- istence of the fertile and refractory-transitional mantle was better explained by the effects of heterogeneous erosion, transformation and replacement of asthenospheric materials on the cratonic lithosphere mantle.
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Key words:
- peridotites /
- mineral chemistry /
- asthenospheric erosion /
- mantle replacement /
- heterogeneity /
- North China craton
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图 1 华北克拉通主要构造单元及样品出露位置（构造单元划分据Zhao et al., 2001）；☆.代表取样地点阳原
Fig. 1. Sketch map showing major tectonic units and sample position in North China craton
图 2 代表性阳原残碎斑状结构橄榄岩捕虏体显微照片
Fig. 2. Microphotograph showing representative Yangyuan peridotite xenoliths with porphyroclastic texture
图 3 阳原橄榄岩结构（a）和橄榄石Mg#频数分布直方图（b）
其他数据来源：鹤壁, Zheng et al.（2001）；山旺, Zheng et al.（1998）；阳原部分数据, Xu et al.（2008）见图（b）
Fig. 3. Frequency distribution of texture (a) and olivine-Mg# in olivine (b) of the Yangyuan peridotitic xenoliths
图 4 橄榄石Mg#对MnO(a), CaO(b)、Ni(c)和Co(d)图解
其他数据来源: 鹤壁, Zheng et al. (2001); 山旺, Zheng et al.(1998)
Fig. 4. Plots of Mg# vs MnO (a), CaO (b), Ni (c) and Co (d) in olivine
图 5 单斜辉石(a)和尖晶石(b)的Cr#-Mg#图解
其他数据来源: 鹤壁, Zheng et al. (2001); 山旺, Zheng et al. (1998)
Fig. 5. Plots of Cr# vs Mg# in clinopyroxene (a) and spinel (b) from Yangyuan xenoliths
图 6 单斜辉石Cr#对Ti(a)、Y(b)、Ce(c)、La/Yb(d)和La对Ti(e)、Zr(f)、Nb(g)、Sr(h)图解
其他数据来源: 鹤壁, Zheng et al. (2001); 山旺, Zheng et al. (1998); (f)-(h)图例同(e)
Fig. 6. Plots of Cr# vs Ti(a), Y(b), Ce(c) and La/Yb(d) and Lavs Ti(e), Zr(f), Nb(g) and Sr(h) in clionpyroxene
图 7 阳原单斜辉石稀土和微量元素配分模式
标准化值根据Sun and MeDonough, 1989; 阴影部分数据来源于Xu et al. (2008)
Fig. 7. REE and trace element patterns in clinopy roxenes from the Yangyuan peridotitic xenoliths
图 8 阳原单斜辉石原始地幔标准化的分离熔融模拟
Fig. 8. Modeling of partial melting fractions wsing clinopyroxene compositions normalized to primitive mantle (McDonough and Sun, 1995) from Yangyuan peridotites
图 9 阳原单斜辉石的Ti/Eu对（La/Yb）N图解
Fig. 9. Plot of Ti/Eu vs (La/Yb)N in clinopyroxene from Yangyuan xenoliths
图 10 华北东部橄榄岩中橄榄石含量（%）对Mg#图解
Fig. 10. Plots of mode (%) vs Mg# of olivine in peridotites from North China
图 11 阳原橄榄石Mg#对TRD（Ga）（a）和橄榄岩平衡温度（b）图解
Fig. 11. Plots of Mg# vs TRD(Ga) (a) and temperature (b) in the Yangyuan peridotitic xenoliths
表 1 阳原橄榄岩捕虏体结构和矿物组成（%）
Table 1. Microstructure and mineral mode (%) of the Yangyuan peridotites xenoliths
表 2 阳原橄榄岩捕虏体各矿物电子探针分析结果(%)
Table 2. Eleton probe micranly's data of minerals from Yangyuan pedotite xnolitis(%)
表 3 阳原橄榄石微量元素分析结果(10-6)
Table 3. Trace elements concentrations of olivine from Yangyuan peridotite xenoliths(10-6)
表 4 阳原单斜辉石微量元素分析结果(10-6)
Table 4. Trace elements concentrations of clinopyroxene from the Yangyuan peridotite xenoliths(10-6)
表 5 阳原尖晶石微量元素分析结果(10-6)
Table 5. Trace elements concent rations of spinel from Yangyuan peridotite xenoliths(10-6)
表 6 阳原橄榄岩捕虏体平衡温度温度(℃)
Table 6. Equilibrium temperature estimates of the Yangyuan peridotite xenoliths
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