西准噶尔谢米斯台西段花岗岩年代学、地球化学、锆石Lu-Hf同位素特征及大地构造意义

杨钢; 肖龙; 王国灿; 高睿; 贺新星; 鄢圣武; 杨维; 晏文博; 周佩

doi:10.3799/dqkx.2015.043

西准噶尔谢米斯台西段花岗岩年代学、地球化学、锆石Lu-Hf同位素特征及大地构造意义

doi: 10.3799/dqkx.2015.043

杨钢^{1, 2,},
肖龙^2, ,,
王国灿^{2, 3},
高睿^{2, 4},
贺新星^{2, 5},
鄢圣武^{2, 6},
杨维^{2, 7},
晏文博²,
周佩²

1.
中国地震局地震研究所地震大地测量重点实验室, 湖北武汉 430071
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
4.
成都理工大学地球科学学院, 四川成都 610059
5.
江苏省地质调查研究院, 江苏南京 210018
6.
四川省地质调查院, 四川成都 610081
7.
贵州省煤田地质局地质勘察研究院, 贵州贵阳 550008

基金项目:

中国地质调查局项目"西准噶尔克拉玛依后山地区三维地质调查试点" 1212011220245

新疆1∶25万铁厂沟镇幅(L45C002001)与克拉玛依市幅(L45C003001)区调修测项目 1212011120502

详细信息

作者简介:
杨钢(1987-), 男, 助理工程师, 主要从事岩石学和地震地质学研究.E-mail: 2639297557@qq.com

通讯作者:
肖龙, E-mail: longxiao@cug.edu.cn

中图分类号: P534
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- 被引次数: 0
出版历程
- 收稿日期: 2014-05-06
- 刊出日期: 2015-03-15

Geochronology, Geochemistry and Zircon Lu-Hf Study of Granites in Western Section of Xiemisitai Area, Western Junggar

Yang Gang^{1, 2
,},
Xiao Long^{2
, ,},
Wang Guocan^{2, 3},
Gao Rui^{2, 4},
He Xinxing^{2, 5},
Yan Shengwu^{2, 6},
Yang Wei^{2, 7},
Yan Wenbo²,
Zhou Pei²

1.
Key Laboratory of Earthquake Geodesy, Institute of Earthquake, China Earthquake Administration, Wuhan 430071, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
5.
Geological Survey of Jiangsu Province, Nanjing210018, China
6.
Geological Survey of Sichuan Province, Chengdu 610081, China
7.
Institute of Geological Prospecting, Coal Mine Exploration of Guizhou Province, Guiyang 550008, China

摘要

摘要: 西准噶尔谢米斯台花岗岩研究程度偏低, 运用锆石LA-ICP-MS U-Pb年代学、地球化学及锆石Lu-Hf同位素方法研究西准谢米斯台西段地区花岗岩, 结果表明: 谢米斯台岩体(427.6±2.3 Ma)和哈勒盖特希岩体(428.6±2.5 Ma)均形成于中志留世; 谢米斯台碱长花岗岩地球化学特征类似于Ⅰ型花岗岩, 哈勒盖特希碱长花岗岩地球化学特征类似于A型花岗岩; 锆石Hf同位素组成较均一, ε_Hf(t)=12.4~14.5, 二阶段模式年龄t_DM2变化范围在497~603 Ma之间, Ⅰ型花岗岩和A₂型花岗岩可能形成于后碰撞阶段的挤压-伸展转变期, 是中志留世额尔齐斯-斋桑洋壳向南俯冲至波谢库尔-成吉斯火山弧底部, 俯冲板片与岛弧底部岩石圈之间剪切带的物质发生变形、变质及部分熔融作用, 使得由亏损地幔形成不久的年轻地壳(由洋壳和岛弧组成)发生部分熔融形成的长英质岩浆经进一步分离结晶作用形成分异Ⅰ型花岗岩和高温、缺水A₂型花岗岩, A₂型花岗岩较Ⅰ型花岗岩分离结晶程度高.
- 锆石LA-ICP-MS U-Pb年龄 /
- 谢米斯台西段 /
- Hf同位素 /
- A型花岗岩 /
- 地球化学
Abstract: LA-ICP-MS U-Pb zircon age, geochemistry and Lu-Hf isotopic data for Xiemisitai and Halegaitexi granitic plutons in the western Junggar are presented in this paper, aiming to determine their forming ages, source regions and tectonic settings. LA-ICP-MS zircon yields 427.6±2.3 Ma for Xiemisitai alkali feldspar granites and 428.6±2.5 Ma for Halegaitexi alkali feldspar granites, respectively. Xiemisitai alkali feldspar granites are characterized as the Ⅰ-type granite, while Halegaitexi alkali feldspar granites have geochemical characteristics similar to the A-type granite. Zircon Lu-Hf isotopic compositions indicate that ε_Hf(t)=12.4-14.5, two-stage model ages (t_DM2) range from 497 to 603 Ma. The petrogenesis of Ⅰ-type and A-type granites were results of different evolutive phases of the same source magma in the compressible to extendable period of the post-collisional phase, which may be derived as follows. The southward subductional Irtysh-Zaysan Oceanic crust subductioned to the asthenospheric mantle which is the bottom of Boshchekul-Chingiz volcanic arc, resulted in the asthenospheric mafic magma underplating the lower crust. Then, the lower juvenile basaltic crust derived from the depleted mantle underwent different degrees of partial melting and fractional crystallization to a certain extent to generate the Ⅰ-type and A₂-type granites.
- LA-ICP-MS zircon U-Pb age /
- western section of Xiemisitai /
- Hf isotope /
- A-type granite /
- geochemistry

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图 1 新疆西准噶尔地区地质图

图 1改自申萍等(2010)、Shen et al.(2012).年龄1据Chen et al.(2010)；年龄2据Shen et al.(2012)；年龄3据张元元和郭召杰(2010)

Fig. 1. Geological map of western Junggar Region, Xinjiang

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图 2 谢米斯台西段地质图

Fig. 2. Geological map in west part of Xiemisitai Mountain

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图 3 谢米斯台西段花岗岩野外及显微镜下特征

碱长花岗岩野外特征(a.谢米斯台；c.哈勒盖特希)；花岗岩正交镜下特征(b.谢米斯台；d.哈勒盖特希)；Qz.石英；Am.角闪石；Kfs.钾长石；Pl.斜长石

Fig. 3. Field and microscopic characteristics of granites in west part of Xiemisitai Mountain

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图 4 谢米斯台西段花岗岩部分锆石CL图像、测点位置及谐和年龄

Fig. 4. Zircon CL graphics, points sites and concordia ages of granite in Wangfeng area in west part of Xiemisitai Mountain

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图 5 谢米斯台西段花岗岩锆石U-Pb谐和图

Fig. 5. U-Pb concordia diagram of granites in west part of Xiemisitai Mountain

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图 6 谢米斯台西段花岗岩Hf同位素特征

Fig. 6. Zircon Hf isotopic features for the granites in west part of Xiemisitai Mountain

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图 7 谢米斯台西段花岗岩SiO₂-AR关系和(a)铝饱和指数图解(b)

a底图据肖庆辉等(2002)

Fig. 7. The relation of SiO₂-AR (a) and Al-saturation index diagram (b) of granites in west part of Xiemisitai Mountain

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图 8 谢米斯台西段花岗岩稀土元素配分型式图解(a)与微量元素配分型式图解(b)

标准化的球粒陨石REE含量引自Sun and McDonough(1989)

Fig. 8. Chondrite-normalized REE diagram (a) and primitive mantle-normalized trace element diagram (b) of granites in west part of Xiemisitai Mountain

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图 9 Rb/Ba-(Zr+Nb+Ce+Y)、(Na₂O+K₂O)/CaO-(Zr+Nb+Ce+Y)图解和A₁-A₂型花岗岩图解

图a, b据Whalen et al.(1987)；图c据Eby(1992).A-A.A-A型花岗岩；FG.M+I+S型分异花岗岩；OGT.未分异M+I+S型花岗岩；S.分异的S型花岗岩；I.分异的Ⅰ型花岗岩；A₁.A₁型花岗岩；A₂.A₂型花岗岩

Fig. 9. Rb/Ba-(Zr+Nb+Ce+Y), (Na₂O+K₂O)/CaO-(Zr+Nb+Ce+Y) diagrams and distinguish diagrams of A₁-A₂ granites

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图 10 Rb-(Y+Nb)构造判别

ORG.大洋脊花岗岩；WPG.板内花岗岩；VAG.火山弧花岗岩；syn-COLG.同碰撞花岗岩；post-COLG.后碰撞花岗岩；底图据Pearce et al.(1984)

Fig. 10. Rb-(Y+Nb) diagram

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表 1 谢米斯台西段花岗岩锆石LA-ICP-MS U-Pb测年数据

Table 1. Zircon LA-ICP-MS U-Pb dating data of granites in west part of Xiemisitai Mountain

分析点	²³²Th(10-6)	²³⁸U(10-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
分析点	²³²Th(10-6)	²³⁸U(10-6)	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄(Ma)	1σ	年龄(Ma)	1σ	年龄(Ma)	1σ
哈勒盖特希碱长花岗岩
N1825-1-01	1 147	1 342	0.9	0.074 9	0.003 1	0.867 3	0.033 3	0.083 5	0.000 9	1 065.7	82.6	634.1	18.1	517.2	5.5
N1825-1-02	3 057	3 155	1.0	0.072 6	0.002 1	0.696 3	0.020 3	0.068 5	0.000 7	1 003.4	58.8	536.6	12.2	427.3	4.1
N1825-1-03	3 332	2 535	1.3	0.062 8	0.001 9	0.682 1	0.020 3	0.077 9	0.000 8	701.9	64.8	528.0	12.3	483.5	4.7
N1825-1-04	2 229	1 849	1.2	0.055 3	0.002 1	0.527 1	0.018 8	0.068 7	0.000 9	433.4	85.2	429.9	12.5	428.6	5.7
N1825-1-05	3 681	2 646	1.4	0.055 8	0.001 8	0.536 1	0.017 0	0.068 8	0.000 8	455.6	74.1	435.8	11.2	429.1	4.9
N1825-1-06	2 334	1 878	1.2	0.059 9	0.002 2	0.571 9	0.020 7	0.068 4	0.000 8	611.1	79.6	459.2	13.4	426.2	4.8
N1825-1-07	1 625	1 320	1.2	0.057 9	0.002 5	0.549 3	0.022 0	0.068 8	0.000 9	524.1	92.4	444.5	14.5	429.1	5.4
N1825-1-08	2 727	2 371	1.2	0.056 4	0.001 8	0.536 4	0.016 9	0.068 5	0.000 7	477.8	72.2	436.1	11.2	427.1	4.1
N1825-1-09	605.0	753.0	0.8	0.075 6	0.003 8	0.728 1	0.038 5	0.069 0	0.001 0	1 084.9	100.0	555.5	22.6	429.9	5.8
N1825-1-10	4 645	2 878	1.6	0.055 3	0.001 8	0.528 0	0.017 0	0.068 9	0.000 8	433.4	74.1	430.5	11.3	429.4	4.8
N1825-1-11	3 121	1 828	1.7	0.071 9	0.002 5	0.687 9	0.025 0	0.068 8	0.000 9	983.3	72.2	531.5	15.1	429.0	5.3
N1825-1-12	2 604	2 657	1.0	0.062 6	0.002 4	0.596 3	0.021 5	0.069 0	0.001 0	694.5	80.4	474.9	13.7	430.1	6.0
N1825-1-13	2 867	2 160	1.3	0.068 4	0.002 7	0.661 4	0.027 1	0.069 4	0.001 0	879.6	84.3	515.4	16.5	432.7	6.0
N1825-1-14	965.0	1 033	0.9	0.057 4	0.003 7	0.546 5	0.035 9	0.068 7	0.001 3	505.6	137.9	442.7	23.5	428.1	8.1
N1825-1-15	434.0	651.0	0.7	0.062 5	0.003 8	0.588 6	0.033 7	0.068 6	0.001 1	700.0	129.6	470.0	21.6	427.8	6.9
N1825-1-16	888.0	1 044	0.9	0.062 7	0.003 1	0.605 0	0.031 0	0.069 1	0.001 1	698.2	304.6	480.4	19.6	430.7	6.8
N1825-1-17	713.0	1 008	0.7	0.056 9	0.002 2	0.544 6	0.020 7	0.068 9	0.000 9	487.1	87.0	441.4	13.6	429.6	5.5
N1825-1-18	1 865	1 701	1.1	0.058 9	0.002 2	0.564 1	0.020 9	0.068 7	0.001 0	561.1	81.5	454.2	13.6	428.5	5.9
N1825-1-19	1 077	1 309	0.8	0.053 4	0.002 0	0.510 7	0.019 1	0.068 3	0.000 9	346.4	85.2	418.9	12.8	426.1	5.4
N1825-1-20	3 945	6 786	0.6	0.068 4	0.003 0	0.660 7	0.030 0	0.068 8	0.001 3	879.6	90.7	515.1	18.3	428.7	8.0
谢米斯台碱长花岗岩
N4814-2-1	1 642	1 594	1.0	0.071 4	0.002 3	0.562 9	0.018 2	0.058 9	0.001 4	968.5	66.7	453.4	11.8	369.0	8.8
N4814-2-2	4 072	3 928	1.0	0.229 2	0.005 9	1.502 9	0.035 9	0.047 7	0.000 6	3 046.0	40.6	931.6	14.6	300.2	3.8
N4814-2-3	342	412	0.8	0.057 4	0.003 6	0.536 3	0.031 9	0.068 6	0.001 0	505.6	138.9	436.0	21.1	427.8	6.2
N4814-2-4	1 261	1 188	1.1	0.056 9	0.002 3	0.542 4	0.022 0	0.068 6	0.000 8	500.0	88.9	440.0	14.5	427.7	4.6
N4814-2-5	495	536	0.9	0.068 7	0.004 6	0.647 3	0.039 9	0.068 6	0.001 2	900.0	143.5	506.8	24.6	427.5	7.5
N4814-2-6	1 368	1 412	1.0	0.089 5	0.003 5	0.849 4	0.033 0	0.068 6	0.001 0	1 416.7	74.5	624.3	18.1	427.7	6.2
N4814-2-7	925	1 134	0.8	0.060 7	0.002 1	0.662 8	0.021 8	0.079 1	0.000 9	631.5	75.9	516.3	13.3	490.8	5.5
N4814-2-8	1 298	1 406	0.9	0.085 8	0.002 9	0.817 7	0.027 4	0.068 5	0.000 8	1 400.0	60.2	606.8	15.3	427.3	4.9
N4814-2-9	381	471	0.8	0.064 1	0.003 8	0.601 2	0.034 6	0.068 4	0.001 1	746.3	124.1	478.0	22.0	426.3	6.4
N4814-2-10	332	434	0.8	0.062 6	0.003 5	0.665 5	0.037 3	0.076 6	0.001 3	694.5	120.4	517.9	22.8	476.1	8.0
N4814-2-11	1 050	1 030	1.0	0.063 1	0.003 1	0.591 6	0.028 0	0.067 9	0.000 9	722.2	101.7	471.9	17.9	423.4	5.7
N4814-2-12	533	724	0.7	0.053 0	0.003 6	0.499 0	0.029 2	0.068 8	0.001 3	331.5	151.8	411.0	19.8	429.2	8.1
N4814-2-13	2 319	3 075	0.8	0.125 6	0.005 0	0.959 3	0.030 8	0.056 9	0.001 0	2 036.7	70.4	682.9	16.0	356.9	5.8
N4814-2-14	936	1 113	0.8	0.131 6	0.008 4	1.245 5	0.070 0	0.069 0	0.001 3	2 120.4	112.3	821.4	31.7	430.0	8.1
N4814-2-15	1 824	1 662	1.1	0.102 4	0.004 0	0.962 3	0.035 6	0.068 4	0.001 0	1 677.8	72.4	684.5	18.4	426.7	5.9
N4814-2-16	961	997	1.0	0.114 8	0.004 4	1.114 5	0.042 4	0.069 9	0.000 9	1 877.5	69.9	760.3	20.4	435.5	5.7
N4814-2-17	868	1 177	0.7	0.085 7	0.003 6	0.744 0	0.033 5	0.061 8	0.000 7	1 331.8	80.1	564.7	19.5	386.8	4.4
N4814-2-18	321	455	0.7	0.056 5	0.003 9	0.540 5	0.037 6	0.069 0	0.001 4	472.3	149.1	438.8	24.8	430.1	8.3
N4814-2-19	448	532	0.8	0.058 7	0.003 7	0.554 2	0.032 8	0.069 0	0.001 2	553.7	138.9	447.7	21.4	430.3	7.5
N4814-2-20	477	512	0.9	0.058 2	0.003 0	0.558 0	0.029 4	0.069 0	0.001 0	600.0	119.4	450.2	19.2	430.0	6.0

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表 2 谢米斯台西段花岗岩锆石Lu-Hf同位素分析结果

Table 2. Zircon Lu-Hf isotopic analysis results of granites in west part of Xiemisitai Mountain

测点号	¹⁷⁶Hf/¹⁷⁷Hf	1σ	¹⁷⁶Lu/¹⁷⁷Hf	1σ	¹⁷⁶Yb/¹⁷⁷Hf	1σ	年龄(Ma)	ε_Hf(0)	1σ	ε_Hf(t)	1σ	t_DM1(Ma)	t_DM2(Ma)	f_Lu/Hf
哈勒盖特希碱长花岗岩
N1825-1-6	0.282 889	0.000 010	0.001 492	0.000 003	0.047 059	0.000 303	426.2	4.2	0.6	13.5	0.7	521	550	-0.96
N1825-1-7	0.282 878	0.000 011	0.002 162	0.000 059	0.074 503	0.001 959	429.1	3.7	0.6	12.7	0.7	547	587	-0.93
N1825-1-9	0.282 922	0.000 010	0.002 219	0.000 078	0.070 719	0.002 474	429.9	5.3	0.6	14.5	0.7	483	497	-0.93
N1825-1-11	0.282 904	0.000 011	0.001 585	0.000 018	0.054 474	0.000 824	429.0	4.7	0.6	13.7	0.7	500	526	-0.95
N1825-1-12	0.282 920	0.000 014	0.002 200	0.000 095	0.067 869	0.002 120	430.1	5.2	0.7	14.4	0.8	486	501	-0.93
N1825-1-14	0.282 912	0.000 013	0.002 216	0.000 074	0.065 818	0.001 258	428.1	4.9	0.7	14.0	0.7	498	519	-0.93
谢米斯台碱长花岗岩
N4814-2-14	0.282 868	0.000 009	0.002 012	0.000 019	0.066 244	0.001 039	430.0	3.4	0.6	12.4	0.6	559	603	-0.94
N4814-2-11	0.282 917	0.000 013	0.001 920	0.000 059	0.064 961	0.001 309	423.4	5.1	0.7	14.2	0.7	486	504	-0.94
N4814-2-6	0.282 879	0.000 011	0.001 891	0.000 051	0.067 577	0.002 224	427.7	3.8	0.6	12.9	0.7	541	578	-0.94
N4814-2-5	0.282 884	0.000 014	0.002 040	0.000 090	0.062 693	0.002 882	427.5	4.0	0.7	13.0	0.8	536	571	-0.94
N4814-2-3	0.282 913	0.000 011	0.002 424	0.000 065	0.087 726	0.002 421	427.8	5.0	0.6	13.9	0.7	500	522	-0.93
N4814-2-8	0.282 907	0.000 010	0.002 129	0.000 018	0.077 695	0.000 617	427.3	4.8	0.6	13.9	0.7	505	527	-0.94

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表 3 谢米斯台西段碱长花岗岩主量元素(%)、微量(10^-6)和稀土元素(10^-6)分析结果

Table 3. Major and trace element contents of alkalic granites in west part of Xiemisitai Mountain

样品号	H4814-2	H2380-1	H2380-5	H2910-1	样品号	H4814-2	H2380-1	H2380-5	H2910-1
SiO₂	72.32	75.64	74.92	75.02	Yb	2.35	8.04	7.28	7.14
TiO₂	0.32	0.22	0.22	0.21	Lu	0.36	1.21	1.13	1.07
Al₂O₃	13.99	12.04	12.41	11.57	Y	20.40	65.60	62.40	61.80
Fe₂O₃	1.13	1.56	1.34	1.98	Cr	9.38	12.30	11.30	9.00
FeO	0.72	1.15	1.07	0.67	Co	3.06	1.32	0.87	1.87
MnO	0.08	0.08	0.02	0.05	Li	4.43	11.10	8.01	5.70
MgO	0.49	0.16	0.25	0.21	Rb	148.00	148.00	106.00	128.00
CaO	0.85	0.12	0.01	0.65	Nb	11.90	28.90	23.80	25.40
Na₂O	3.77	3.56	4.59	3.54	Cs	1.79	1.34	1.15	1.66
K₂O	5.19	4.71	4.28	4.83	Hf	5.93	12.80	11.20	12.50
P₂O₅	0.09	0.02	0.02	0.02	Zr	178.00	561.00	455.00	467.00
H₂O⁺	0.83	0.61	0.71	0.56	Ta	1.12	1.95	1.57	1.90
CO₂	0.03	0.03	0.03	0.57	Pb	15.30	9.15	8.72	15.10
Lost	0.77	0.53	0.68	0.87	Th	15.60	14.70	11.30	12.10
Total	100.58	100.43	100.55	100.75	U	1.38	3.78	3.00	3.48
A/CNK	1.05	1.08	1.02	0.95	Sc	6.35	4.94	5.46	3.66
A/NK	1.18	1.10	1.02	1.05	Ba	778.00	71.90	73.50	104.00
Mg^#	42.00	13.00	21.00	19.00	Ni	1.98	2.76	2.53	3.13
La	28.10	61.80	53.30	46.40	Sr	157.00	24.20	17.40	20.60
Ce	50.50	120.00	99.40	96.90	V	18.40	8.45	5.14	7.11
Pr	6.30	16.40	13.50	12.50	ΣREE	146.92	383.73	328.85	314.67
Nd	22.50	60.90	50.40	47.40	LREE	112.82	272.42	227.18	213.83
Sm	4.42	12.80	10.30	10.40	HREE	34.10	111.31	101.67	100.84
Eu	0.970	0.320	0.301	0.320	LREE/HREE	3.31	2.45	2.23	2.12
Gd	3.85	10.60	8.77	8.55	La/Sm	6.36	4.81	5.17	4.47
Tb	0.657	2.240	1.780	1.900	Sr/Y	7.68	0.37	0.28	0.33
Dy	3.26	11.90	10.20	10.50	Rb/Sr	0.95	6.10	6.11	6.23
Ho	0.734	2.700	2.270	2.320	(La/Yb)_N	8.58	5.51	5.25	4.66
Er	2.09	7.70	6.73	6.51	δEu	0.71	0.08	0.09	0.10
Tm	0.379	1.290	1.150	1.130	AR	4.05	5.25	6.00	5.35
注：δEu=[Eu_N/(Sm+Gd)_N]1/2，A/NK=Al₂O₃/(Na₂O+K₂O)，A/CNK=Al₂O₃/(CaO+Na₂O+K₂O)，这三者均为摩尔百分比.

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