华北克拉通北缘中段多伦地区早二叠世双峰式岩浆作用

李天瑜; 李世超; 李鹏川; 彭云彪; 那木吉拉; 雒德利; 赵庆英; 孙加鹏

doi:10.3799/dqkx.2021.210

华北克拉通北缘中段多伦地区早二叠世双峰式岩浆作用

doi: 10.3799/dqkx.2021.210

李天瑜^{1, 2,},
李世超^{1, 3, ,},
李鹏川⁴,
彭云彪²,
那木吉拉²,
雒德利²,
赵庆英¹,
孙加鹏¹

1.
吉林大学地球科学学院, 吉林长春 130061
2.
核工业二〇八大队, 内蒙古包头 014010
3.
自然资源部东北亚矿产资源评价重点实验室, 吉林长春 130061
4.
中国地质科学院地质研究所, 北京 100037

基金项目:

国家自然科学基金 41872234

国家自然科学基金 41872194

内蒙古自治区地质勘查基金项目 NMKD2015-35

中国核工业地质局项目 202101

中国核工业地质局项目 202203-4

中国核工业地质局项目 202204-1

详细信息

作者简介:
李天瑜（1989-），男，硕士研究生，构造地质学专业. E-mail：tyli18@mails.jlu.edu.cn

通讯作者:
李世超, E-mail: lsc@jlu.edu.cn

中图分类号: P597
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出版历程
- 收稿日期: 2021-12-28
- 刊出日期: 2023-08-25

Early Permian Bimodal Magmatism in the Duolun Area of the Central Section of the Northern Margin of the North China Craton

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
No. 208 Geological Party, CNNC, Baotou 014010, China
3.
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130061, China
4.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 东大山地区双峰式岩浆岩位于内蒙古多伦县东部，处于华北板块北缘. 岩体由石英二长岩和玄武岩组成. 对其开展了全岩地球化学、锆石U-Pb年代学和Hf同位素组成研究. 研究结果表明：石英二长岩和玄武岩锆石LA-ICP-MS U-Pb定年结果分别为283±1.6 Ma、280±2.9 Ma，形成于早二叠世；二者锆石Hf同位素组成整体较相似，两阶段模式年龄（t_DM2）普遍较为古老（1 760~2 354 Ma，仅玄武岩内测得324 Ma、824 Ma两个较新年龄），与华北板块基底接近；岩体SiO₂含量在50.64%~65.87%存在明显的间断，具有双峰式岩浆岩特征，都相对富K、Na、Al，亏Ca、Mg，石英二长岩较玄武岩明显亏损Ti、P，具有明显的互补迹象. 结合前人研究成果，认为东大山地区双峰式岩浆岩可能是板块俯冲、后撤引起的伸展背景下，古亚洲洋俯冲板片脱水引起上地幔部分熔融形成的幔源岩浆向上运移、聚集于华北板块之下引起古老基底部分熔融的产物，研究区早二叠世期间构造环境为活动大陆边缘.
- 双峰式岩浆岩 /
- 华北板块北缘 /
- 伸展背景 /
- 活动大陆边缘 /
- 早二叠世 /
- 地球化学
Abstract: This paper presents petrological, Hf isotopes, geochronological and geochemical study on the early Permian Bimodal magmatites in Duolun area, Inner Mongolia, which is tectonically located in the northern margin of North China Craton, comprising quartz monzonite and basalt. U-Pb dating of zircons from the samples by LA-ICP-MS yield weighed mean ²⁰⁶Pb/²³⁸U ages of 283±1.6 Ma and 280±2.9 Ma respectively. They have similar Hf isotopes. Hf isotopes t_DM2 was oldgenerally (from 1 760 to 2 354 Ma, merely two youngs: 324 Ma and 824 Ma) and closed to these reported in ancient basement of North China Plate. The quartz monzonite and basalt exhibit SiO₂ geochemical discontinuity (50.64%~65.87%), showing typically bimodal features. They also significantly enrich K, Na, Al and deplete Ca, Mg. Besides, the quartz monzonite show significantly depletions in Ti and P compared with the basalt, showing complementary relations. This paper, combined with previous data, suggest that Bimodal magmatitesare the products of partial melting of the ancient basement of the North China Plate under the background of extension, which was caused by the upward migrating and gathering of the mantle magma formed from partial melting of mantle resulted in dewatering of subducted plate of the ancient Asian Ocean. In the early Permian, Dongdashan area is under the background of active continental margin.
- bimodal magmatites /
- Northern margin of North China Craton /
- extension setting /
- active continental margin /
- the early Permian /
- geochemistry

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图 1 研究区大地构造背景(a)及地质简图(b)

1. 第四系；2. 下白垩统义县组；3. 下白垩统玛尼吐组；4. 下白垩满克头鄂博组；5. 下二叠统额里图组；6. 中元古界白云鄂博群；7. 早白垩世二长花岗岩；8. 早二叠世石英二长岩；9. 采样点

Fig. 1. Geological regional location(a) and geological sketch map of research area(b)

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图 2 石英二长岩野外（a）及显微照片（b）、玄武岩野外（c）及显微照片（d）

Q. 石英；Pl. 斜长石；Or. 正长石；Am. 角闪石

Fig. 2. Photographs of field and micro for the quartz monzonite(a, b) and basalt(c, d)

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图 3 石英二长岩、玄武岩锆石CL图像

白圈代表测试位置，数字代表U-Pb、Lu-Hf测试序号

Fig. 3. CL images of quartz monzonite and basalt

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图 4 石英二长岩、玄武岩锆石U-Pb谐和图

Fig. 4. U-Pb concordia diagrams of zircon for quartz monzonite and basalt

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图 5 石英二长岩(a)、玄武岩(b)锆石ε_Hf(t)-锆石年龄图解

Fig. 5. ε_Hf(t) vs. zircon ages plots for quartz monzonite and basalt

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图 6 石英二长岩TAS图解(a, 据Irvine and Baragar, 1971)和玄武岩Zr/Tio₂-Nb/Y图解(b, 据Wilson, 1989）

Fig. 6. TAS(a, after Irvine and Baragar, 1971) and Zr/Tio₂ vs. Nb/Y(b, after Wilson, 1989) classification diagrams for quartz monzonite(a) and basalt(b)

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图 7 石英二长岩、玄武岩稀土元素配分模式图（a, 据Boynton, 1984）和微量元素原始地幔标准化图解（b，据Sun and McDonough，1989）

Fig. 7. Chondrite-normalized REE pstterns (a, normalization values after Boynton, 1984) and primitive mantle-normalized trace element spider diagrams (b, normalization values after Sun and McDonough, 1989) for quartz monzonite (a) and basalt (b)

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图 8 石英二长岩Ⅰ型-A型花岗岩判别图解(a, 据Collins et al., 1982)和玄武岩La/Yb-Sm/Yb图解(b, 据Xu et al., 2005)

Fig. 8. Ⅰ model vs. A model (a, after Collins et al., 1982) and La/Yb vs.Sm/Yb (b, after Xu et al., 2005) classification diagrams for quartz monzonite (a) and basalt (b)

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图 9 东大山地区双峰式岩浆岩Harker图解

Fig. 9. Harker diagram of Bimodal magmatites in Duolun area

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图 10 石英二长岩微量元素w(Y+Nb)-w(Rb)构造环境判别图（a，据Pearce et al., 1984）及玄武岩Th-Ta协变判别图解（b, 据Pearce et al., 1982）

ORG. 大洋中脊花岗岩；WPG. 板内花岗岩；VAG. 火山弧花岗岩；Syn-COLG. 同碰撞花岗岩；MORB. 洋中脊玄武岩；WPB. 板内玄武岩；IAB. 岛弧玄武岩；SHO. 橄榄玄武岩；TH. 拉斑玄武岩；TR. 过渡性玄武岩；ALK. 碱性火山弧玄武岩；ICA. 钙碱性玄武岩

Fig. 10. w(Y+Nb) vs. w(Rb) (a, after Pearce et al., 1984) and Th vs. Ta (b, after Pearce et al., 1982) classification diagrams for quartz monzonite (a) and basalt (b)

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图 11 东大山地区双峰式岩浆岩形成模型

据朱日祥和徐日刚（2019）改

Fig. 11. Aschematic diagram showing the mechanism in formation of Bimodal magmatites in Duolun area

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表 1 东大山双峰式岩浆岩中的锆石LA-ICP-MS U-Pb定年数据

Table 1. LA-ICP-MS zircon U-Pb dating results for quartz monzonite and basalt

测点	含量		Th/U	同位素比值						年龄
测点	Th	U	Th/U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ		²⁰⁷Pb/²⁰⁶Pb	1σ
石英二长岩
1	135.1	191	0.82	0.044	0.000 6	0.328	0.014 7	0.054	0.002 4	280	4	288	11	369	106
2	298.5	261	1.26	0.045	0.000 7	0.309	0.013 4	0.051	0.002 2	281	4	274	10	232	102
3	156.3	236	0.82	0.044	0.000 6	0.325	0.015 4	0.053	0.002 4	279	4	286	12	339	104
4	210.2	258	0.99	0.044	0.000 6	0.313	0.013 3	0.052	0.002 3	280	4	276	10	333	100
5	331.4	342	1.31	0.044	0.000 7	0.325	0.012 7	0.053	0.002 0	280	4	285	10	343	90
6	648.7	763	0.99	0.045	0.000 7	0.351	0.011 5	0.057	0.002 0	281	4	305	9	502	71
7	203.8	180	1.39	0.046	0.000 8	0.327	0.015 6	0.052	0.002 6	289	5	287	12	295	139
8	218.3	258	0.94	0.044	0.000 6	0.347	0.016 0	0.057	0.002 7	280	4	302	12	494	106
9	160.7	206	0.93	0.044	0.000 8	0.344	0.016 5	0.057	0.002 7	280	5	300	12	483	107
10	416.3	424	1.26	0.044	0.000 8	0.333	0.018 7	0.054	0.003 0	280	5	292	14	383	122
11	157.1	221	0.97	0.045	0.000 9	0.371	0.024 5	0.060	0.003 7	283	5	320	18	606	140
12	831.6	408	2.86	0.045	0.000 9	0.303	0.019 3	0.049	0.003 4	285	5	269	15	169	156
13	681.7	435	1.90	0.045	0.000 6	0.340	0.013 2	0.056	0.002 1	282	4	297	10	435	83
14	145.6	162	1.05	0.046	0.000 8	0.347	0.016 7	0.055	0.002 6	289	5	302	13	433	104
15	233.0	232	1.31	0.045	0.000 7	0.316	0.014 7	0.051	0.002 4	286	4	279	11	243	107
16	148.4	221	0.78	0.044	0.000 8	0.379	0.020 6	0.062	0.003 4	281	5	326	15	700	117
17	182.3	240	0.93	0.045	0.000 6	0.356	0.013 7	0.058	0.002 3	283	4	309	10	539	92
18	183.6	268	0.88	0.045	0.000 6	0.311	0.011 4	0.051	0.002 0	286	4	275	9	233	95
19	148.9	214	0.85	0.046	0.000 7	0.330	0.015 3	0.052	0.002 4	293	4	289	12	272	105
20	326.3	382	1.06	0.045	0.000 6	0.326	0.012 4	0.052	0.001 9	285	3	286	10	283	83
21	222.9	242	1.07	0.045	0.000 6	0.363	0.015 6	0.059	0.002 6	282	4	315	12	576	127
22	220.3	361	0.70	0.046	0.000 6	0.328	0.011 8	0.051	0.001 8	293	4	288	9	261	75
23	1615	521	3.56	0.044	0.000 6	0.310	0.012 9	0.051	0.002 2	278	4	274	10	256	100
24	156.6	148	1.31	0.045	0.000 9	0.350	0.022 9	0.057	0.003 8	283	6	305	17	498	148
25	362.1	504	0.82	0.045	0.000 6	0.323	0.001 0	0.053	0.001 6	282	3	285	8	309	69
玄武岩
1	186	256	0.73	0.04	0.000 8	0.34	0.015	0.055	0.002 0	280	5	296	12	433	94
2	351	292	1.20	0.05	0.000 6	0.36	0.016	0.058	0.003 0	287	4	313	12	522	96
3	185	250	0.74	0.04	0.000 8	0.32	0.015	0.053	0.003 0	281	5	282	12	309	119
4	194	272	0.71	0.04	0.000 8	0.36	0.018	0.06	0.003 0	277	5	313	14	611	111
5	170	177	0.96	0.04	0.001 8	0.33	0.047	0.055	0.009 0	271	11	288	36	432	373
6*	112	140	0.80	0.04	0.000 9	0.33	0.026	0.064	0.006 0	243	6	286	20	744	198
7*	788	683	1.15	0.03	0.000 5	0.26	0.008	0.057	0.002 0	207	3	231	6	500	67
8	290	397	0.73	0.04	0.000 8	0.39	0.015	0.065	0.002 0	277	5	337	11	783	78
9*	81	107	0.76	0.05	0.000 9	0.58	0.028	0.084	0.004 0	314	5	462	18	1 302	90
10*	168	248	0.68	0.04	0.000 8	0.33	0.012	0.053	0.002 0	281	5	286	9	324	112
11	201	364	0.55	0.04	0.000 9	0.32	0.018	0.052	0.003 0	280	5	283	13	306	116
12*	873	870	1.00	0.03	0.000 5	0.28	0.009	0.061	0.002 0	208	3	248	7	633	59
13*	1 259	1679	0.75	0.02	0.000 4	0.2	0.006	0.069	0.002 0	135	2	185	5	900	61
14	319	441	0.72	0.04	0.000 7	0.33	0.012	0.056	0.002 0	274	4	293	9	450	76
15*	133	198	0.67	0.05	0.000 9	0.37	0.014	0.054	0.002 0	313	6	318	11	391	93
16*	322	337	0.95	0.04	0.000 8	0.38	0.027	0.072	0.006 0	243	5	324	20	972	159
17	217	509	0.43	0.04	0.000 6	0.35	0.010	0.059	0.002 0	277	4	308	8	561	64
注：标*号的数据因不协和而未参加统计

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表 2 石英二长岩、玄武岩中锆石的Hf同位素分析结果

Table 2. Zircon Hf isotopic data for quartz monzonite and basalt

测点号	Age(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf()	ε_Hf(t)	T_DM	T_DMc	f_Lu/Hf
石英二长岩
1	280	0.037 074	0.000 429	0.001 154	0.000 014	0.282 132	0.000 020	-22.64	-16.70	1 583	2 354	-0.97
2	281	0.038 734	0.000 140	0.001 201	0.000 004	0.282 202	0.000 024	-20.17	-14.24	1 487	2 198	-0.96
3	279	0.028 828	0.000 247	0.000 881	0.000 009	0.282 196	0.000 019	-20.37	-14.39	1 482	2 208	-0.97
4	280	0.054 428	0.000 439	0.001 617	0.000 015	0.282 285	0.000 023	-17.21	-11.34	1 385	2 017	-0.95
5	280	0.041 198	0.000 270	0.001 215	0.000 008	0.282 253	0.000 020	-18.35	-12.41	1 415	2 084	-0.96
6	281	0.046 922	0.000 353	0.001 371	0.000 009	0.282 312	0.000 018	-16.28	-10.37	1 339	1 955	-0.96
7	289	0.044 059	0.001 810	0.001 303	0.000 054	0.282 245	0.000 022	-18.65	-12.54	1 431	2 100	-0.96
8	280	0.048 764	0.000 347	0.001 487	0.000 015	0.282 311	0.000 020	-16.32	-10.42	1 345	1 960	-0.96
9	280	0.052 770	0.000 749	0.001 535	0.000 026	0.282 213	0.000 024	-19.76	-13.91	1 484	2 177	-0.95
10	280	0.048 744	0.000 135	0.001 414	0.000 005	0.282 288	0.000 022	-17.11	-11.21	1 374	2 009	-0.96
11	283	0.038 939	0.000 132	0.001 153	0.000 002	0.282 290	0.000 023	-17.04	-11.03	1 361	1 999	-0.97
12	285	0.041 294	0.000 628	0.001 190	0.000 022	0.282 207	0.000 025	-19.98	-13.92	1 479	2 183	-0.96
13	282	0.058 001	0.000 598	0.001 646	0.000 021	0.282328	0.000 024	-15.69	-9.79	1 325	1 920	-0.95
14	289	0.046 676	0.000 511	0.001 329	0.000 010	0.282 297	0.000 025	-16.81	-10.74	1 359	1 984	-0.96
15	286	0.056 501	0.001 133	0.001 579	0.000 032	0.282 239	0.000 025	-18.86	-12.88	1 450	2 117	-0.95
16	281	0.059 493	0.000 144	0.001 677	0.000 008	0.282 401	0.000 022	-13.11	-7.27	1 223	1 760	-0.95
17	283	0.034 540	0.000 511	0.000 937	0.000 016	0.282 261	0.000 021	-18.07	-12.03	1 394	2 062	-0.97
18	286	0.039 795	0.000 275	0.001 110	0.000 005	0.282 197	0.000 024	-20.35	-14.27	1 491	2 207	-0.97
玄武岩
1	280	0.051 617	0.000 453	0.001 463	0.000 013	0.282 292	0.000 029	-16.96	-11.08	1 369	1 999	-0.96
2	287	0.039 388	0.000 622	0.001 058	0.000 016	0.282 282	0.000 024	-17.34	-11.24	1 370	2 015	-0.97
3	281	0.098 110	0.000 979	0.002 717	0.000 027	0.282 296	0.000 032	-16.84	-11.18	1 412	2 006	-0.92
4	277	0.043 547	0.000 114	0.001 188	0.000 003	0.282 270	0.000 019	-17.77	-11.87	1 391	2 048	-0.96
5	271	0.075 961	0.000 978	0.002 194	0.000 033	0.282 222	0.000 026	-19.45	-13.89	1 498	2 170	-0.93
8	277	0.056 354	0.000 476	0.001 568	0.000 007	0.282 308	0.000 021	-16.42	-10.59	1 352	1 969	-0.95
10	281	0.045 425	0.000 527	0.001 275	0.000 015	0.282 311	0.000 019	-16.32	-10.38	1 337	1 956	-0.96
11	280	0.034 278	0.000 075	0.000 988	0.000 004	0.282 814	0.000 019	1.48	7.47	620	824	-0.97
14	274	0.058 519	0.000 619	0.001 873	0.000 027	0.282 225	0.000 022	-19.34	-13.67	1 481	2 158	-0.94
17	277	0.051 655	0.000 323	0.001 707	0.000 015	0.283 039	0.000 025	9.44	15.23	307	324	-0.95

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表 3 石英二长岩、玄武岩的主量元素(%)、稀土微量元素(×10^-6)分析结果表

Table 3. Major (%), rare earth and trace element (×10^－6)for quartz monzonite and basalt

样品号	P09-01	P09-03	P09-04	P09-05	P09-06	P13-02	P13-03	P13-04	P13-05
岩性	石英二长岩					玄武岩
SiO₂	66.37	66.59	66.85	67.17	65.87	50.64	49.31	50.36	48.83
TiO₂	0.33	0.43	0.42	0.35	0.40	3.18	3.18	3.08	3.24
Al₂O₃	16.10	16.55	15.89	16.54	16.62	14.63	15.07	14.66	15.81
Fe₂O3	2.77	1.46	1.71	1.37	1.95	9.33	6.65	6.76	6.71
P₂O₅	0.12	0.15	0.15	0.12	0.14	0.85	0.88	0.86	0.91
CaO	1.59	1.84	1.98	1.76	1.85	1.76	2.08	1.81	1.61
K₂O	5.15	4.75	4.72	4.99	4.93	2.68	3.66	3.54	3.92
MgO	0.62	0.81	0.77	0.68	0.8	4.07	5.02	4.68	5.14
MnO	0.09	0.09	0.09	0.08	0.08	0.12	0.11	0.12	0.086
Na₂O	4.67	4.72	4.82	4.76	4.9	4.48	2.94	3.45	2.92
FeO	1.47	1.84	1.81	1.56	1.74	4.35	6.44	6.14	6.48
LOS	0.37	0.77	0.75	0.65	0.70	3.71	4.25	3.82	3.83
Total	99.64	100	99.99	100	99.98	99.8	99.59	99.28	99.48
Mg#	0.23	0.33	0.30	0.32	0.30	0.37	0.43	0.42	0.44
A/CNK	1.02	1.04	0.97	1.02	1.01	1.28	1.44	1.36	1.61
AR	3.23	3.11	3.31	3.17	3.26	2.55	2.04	2.44	2.01
Cr	0.0008	12.8	12.1	13.8	10.8	39.6	27.4	23.8	25.5
Ni	2.324	4.71	6.5	6.25	5.2	18.7	41.9	17.4	72.4
Co	3.354	4.28	5.6	3.93	3.97	38.3	42.5	40.4	45.7
Rb	68.237	69.9	67.2	66.9	66.6	59.8	78.7	72.1	85.7
Cs	2.949	3.14	2.9	2.72	2.2	1.55	1.26	1.16	1.40
Sr	323.45	294	319	304	308	181	180	183	164
Ba	1339.8	1228	1322	1551	1399	1527	2750	2645	2836
V	0.002	28.7	29.4	26.1	26.5	277	293	272	296
Sc	4.497	2.98	3.49	2.75	2.46	22.760 3	21.750 9	20.98	22.10
Nb	8.038	8.75	9.68	7.91	8.13	14.6	14.3	12.8	14.7
Ta	0.736	1.08	1.43	0.93	0.86	1.64	2.22	2.75	1.53
Zr	260.25	252	246	241	229	258	226	222	233
Hf	6.606	1.3	0.5	2.1	1.9	1.20	0.60	0.70	0.50
U	0.585	0.6	0.62	0.5	0.57	0.93	0.73	0.65	0.68
Th	12.055	8.46	9.08	7.93	8.58	5.42	3.47	5.02	3.28
La	66.896	72.676	85.126	59.8	77.342	31.26	26.86	26.41	29.62
Ce	125.365	129.558	150.264	111.596	140.327	69.75	65.81	60.47	68.21
Pr	12.16	12.145	14.726	10.867	13.728	10.09	8.96	8.89	10.16
Nd	36.32	36.513	43.294	32.586	41.365	40.35	39.37	38.11	40.47
Sm	4.654	4.603	5.27	4.005	4.979	1.2	0.6	0.7	0.5
Eu	1.067	1.097	1.093	0.913	0.983	2.31	2.33	2.1	2.38
Gd	4.358	5.848	6.532	4.886	6.244	6.59	6.56	6.33	6.94
Tb	0.447	0.593	0.626	0.527	0.632	1.2	1.23	1.14	1.26
Dy	2.267	2.113	2.511	2.063	2.113	6.71	6.81	5.93	7.05
Ho	0.431	0.372	0.411	0.360	0.376	1.21	1.27	1.12	1.28
Er	1.172	1.314	1.514	1.211	1.321	3.57	3.62	3.21	3.83
Tm	0.181	0.163	0.168	0.146	0.151	0.51	0.52	0.49	0.59
Yb	1.039	1.054	1.168	0.909	1.041	3.17	3.51	3.29	3.73
Lu	0.159	0.151	0.183	0.142	0.158	0.5	0.52	0.47	0.55
Y	10.429	10.929	11.449	9.622	10.264	32.99	32	31.48	35.96
ΣREE	290.7	256.5	268.2	312.9	230.0	185.4	175.66	165.5	184.6
ΣLREE	278.7	246.5	256.6	299.8	219.8	162.0	151.6	143.5	159.4
ΣHREE	12.04	10.06	11.61	13.11	10.24	23.44	24.03	21.96	25.22
LREE/HREE	23.15	24.51	22.11	22.87	21.45	6.91	6.31	6.53	6.32
δEu	0.54	0.72	0.65	0.57	0.63	0.96	0.97	0.93	0.95

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