内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义

王树庆; 辛后田; 张永; 刘文刚

doi:10.3799/dqkx.2021.081

内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义

doi: 10.3799/dqkx.2021.081

王树庆^{1, 2, ,},
辛后田^{1, 2},
张永^{1, 2},
刘文刚^{1, 2}

1.
中国地质调查局天津地质调查中心，天津 300170
2.
华北地质科技创新中心，天津 300170

基金项目:

中国地质调查项目 DD20190038

中国地质调查项目 DD20160041

国家自然科学基金面上项目 41872068

详细信息

作者简介:
王树庆（1983-），男，高级工程师，从事兴蒙造山带地质调查与研究工作.ORCID：0000-0002-4973-7535. E-mail：89617984@qq.com

中图分类号: P597
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出版历程
- 收稿日期: 2021-04-06
- 网络出版日期: 2022-04-29
- 刊出日期: 2022-04-25

Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance

Wang Shuqing^{1, 2
,
,},
Xin Houtian^{1, 2},
Zhang Yong^{1, 2},
Liu Wengang^{1, 2}

1.
Tianjin Center of China Geological Survey, Tianjin 300170, China
2.
North China Center of Geoscience Innovation, Tianjin 300170, China

摘要

摘要: 内蒙古二连-东乌旗地区发育一条晚古生代碱性花岗岩带，代表贺根山洋盆闭合后的伸展背景.本次工作在苏尼特左旗北部红格尔（302±1 Ma）、祖横得楞（~299 Ma）、那仁宝力格（301.7±1.4 Ma）等地区新识别出了晚石炭世碱性花岗岩.野外露头及镜下观察可见其中有钠铁闪石和霓辉石等典型碱性暗色矿物；全岩地球化学分析表明具有高SiO₂（73.15%~77.38%）、高碱（K₂O=4.28%~5.35%，Na₂O=4.01%~4.79%）、贫CaO、MgO、FeO_t，相对富FeO_t（FeO_t/MgO为8.2~46.1）等特征，属于弱过铝质系列（A/CNK范围为0.81~1.06，平均为0.97）；富集Rb、Th、U、K等大离子亲石元素及Zr、Hf等高场强元素，弱亏损Nb、Ta，强烈亏损Ba、Sr、P、Ti；轻稀土略富集，具有明显负Eu异常（δEu=0.03~0.50），显示“海鸥”型稀土配分模式.岩石学和地球化学分析显示本区晚石炭世碱性花岗岩属于碱质A型花岗岩.同位素分析显示具有亏损的Hf-Nd同位素组成，ε_Hf（t）和ε_Nd（t）均为正值，Hf地壳存留模式年龄范围为345~833 Ma（集中于400~600 Ma），二阶段Nd模式年龄范围为396~806 Ma，表明源岩为幔源新生地壳，代表了新元古-早古生代地壳增生.结合区域地质资料表明，二连-东乌旗旗地区晚石炭世碱性花岗岩是由新生基性下地壳在晚石炭世贺根山洋盆闭合后伸展背景下，在上涌软流圈的加热及减压作用下部分熔融形成的，指示贺根山洋盆至少在300 Ma就已封闭.
- 碱性花岗岩 /
- 晚石炭世 /
- 二连-东乌旗地区 /
- 贺根山洋盆关闭 /
- 地球化学
Abstract: The Late Carboniferous alkaline granite belt in Erlian-Dongquqi area indicates regional extention after the closure of Hegenshan ocean. In this paper, it presents recently discovered Late Carboniferous alkaline granites in these regions: Honger(302±1 Ma), Zuhengdeleng (~299 Ma), and Narenbaolige (301.7±1.4 Ma) plutons. These rocks show characteristics of high silica (73.15%-77.38%), alkali (K₂O=4.28%-5.35%, Na₂O=4.01%-4.79%) contents, low CaO, MgO and relatively enriched FeO_t(FeO_t/MgO ratios are between 8.2-46.1) contents, similar with typical alkaline granite. Trace element analysis display enrichment of Rb, Th, U, K, Zr, Hf, but strong depletion of Sr, Ba, P, Ti. There are "sea gull" REE patterns with strong negative Eu abnormity (δEu ranges from 0.03 to 0.50). Furthermore, these rocks have depleted Nd-Hf isotopic composition, with two stage Hf-Nd model ages of Neoproterozoic-Early Paleozoic, indicating that the sources are juvenile crust derived from mantle in this period. Geochemical and Nd-Hf isotopic signatures argue for derivation from partial melting of juvenile crust by depression and heating of upwelling asthenosphere in post-orogeny extensional setting, demonstrating that the Hegenshan basin had closed before 300 Ma.
- alkaline granite /
- Late Carboniferous /
- Erlian-Dongwuqi /
- Hegenshan basin /
- geochemistry

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图 1 二连-东乌旗地区碱性花岗岩分布简图

a.侵入岩简图，其中角图据Xiao et al.（2018）；b，c据河南省地质矿产勘查开发局第一地质矿产调查院, 2015, 1∶50 000阿尔善布拉格幅（L49E022023）地质图；天津市地质调查研究院, 2015, 1∶50 000青格勒宝力格公社幅（L50E020002）地质图；岩体时代见参考文献.碱性花岗岩体名称：1.红格尔；2.赛音乌苏；3.宝拉格；4.白音乌拉；5.祖横得楞；6.那仁宝力格；7.京格斯台；8.扎拉嘎

Fig. 1. Alkaline granite distribution sketch of Erlian-Dongwuqi area, Inner Mongolia

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图 2 样品野外及镜下照片

a，b.祖横得楞（13NM-5）；c，d.那仁宝力格（13NM17）；e，f.红格尔（14SZ31）. 矿物代号：Kf.钾长石；Q.石英；Arf.钠铁闪石；Aug.霓辉石；Pth.条纹长石

Fig. 2. Field and Microscope photographs of samples

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图 3 内蒙古二连-东乌旗地区碱性花岗岩锆石U-Pb测年谐和图及代表性锆石阴极发光图

Fig. 3. Concordia diagrams and cathodoluminescence images for zircon U-Pb dating of Erlian-Dongwuqi Late Carboniferous alkaline granites, Inner Mongolia

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图 4 二连-东乌旗晚石炭世碱性花岗岩SiO₂-FeO_t/(FeO_t+MgO)（a）和A/CNK-A/NK（b）图解

图a据Frost et al., 2001；图b据Maniar and Piccoli, 1989

Fig. 4. SiO₂-FeO_t/(FeO_t+MgO) (a) and A/CNK-A/NK (b) diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites

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图 5 二连-东乌旗晚石炭世碱性花岗岩原始地幔标准化微量元素蛛网图和稀土配分模式(原始地幔标准化数据据Sun and McDonough, 1989)

Fig. 5. Primitive mantle-normalized trace element spider diagrams and chondrite-normalized REE patterns diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites (after Sun and McDonough, 1989)

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图 6 二连-东乌旗地区晚石炭世碱性花岗岩分类判别图解

据Whalen et al., 1987, 阴影区域为270~290 Ma碱性花岗岩，数据来自Zhang et al.（2015），Tong et al.（2015）

Fig. 6. Classification diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites, Inner Mongolia

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图 7 二连-东乌旗地区晚石炭世碱性花岗岩ε_Nd(t)-年龄(a)和ε_Hf(t)-时间(b)图解

图a数据来源：270~290 Ma碱性花岗岩数据据Zhang et al.（2015）和Tong et al.（2015），贺根山蛇绿岩据Miao et al.（2008），晚石炭花岗岩据Wei et al.（2018）和作者未发表数据. 图b兴蒙造山带东段Hf同位素组成据Yang et al.（2006），270~290 Ma碱性花岗岩数据据Zhang et al.（2015）和Tong et al.（2015），京格斯台碱性花岗岩据王树庆等（2017）

Fig. 7. ε_Nd(t) vs. age (a) and ε_Hf(t) vs. time (b) diagrams of Erlian-Dongwuqi Late Carboniferous

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图 8 二连-东乌旗地区晚石炭世碱性花岗岩分类图解

底图据Eby，1992；灰色点为270~290 Ma碱性花岗岩，数据来源据Zhang et al.（2015）和Tong et al.（2015）.图例同图 6

Fig. 8. Discrimination diagrams of Erlian-Dongwuqi Late Carboniferous alkaline granites

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图 9 二连-东乌旗地区晚石炭世碱性花岗岩R1-R2图解

据Batchelor and Bowden（1985），阴影部分为270~290 Ma碱性花岗岩，数据来自Zhang et al.（2015）；Tong et al.（2015）

Fig. 9. R1-R2 diagram of Erlian-Dongwuqi Late Carboniferous alkaline granites

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图 10 内蒙古二连-东乌旗地区晚古生代构造模式

Fig. 10. Simplified tectonic evolution model in Erlian-Dongwuqi region

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表 1 二连-东乌旗地区晚石炭世碱性花岗岩锆石U-Pb测年分析结果

Table 1. Zircon LA-MC-ICPMS U-Pb dating data of Erlian-Dongwuqi Late Carboniferous alkaline granites, Inner Mongolia

点号	含量(10^-6)			Th/U	同位素比值					年龄(Ma)
点号	Pb	U	Th	Th/U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ		²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ
13NM5
1	35	600	943	1.57	0.046 8	0.000 3	0.339 7	0.004 0		295	2	297	3
2	50	1 068	444	0.42	0.046 9	0.000 3	0.338 4	0.003 1		295	2	296	3
3	42	812	323	0.40	0.051 7	0.000 3	0.378 3	0.003 9		325	2	326	3
4	14	304	38	0.13	0.048 3	0.000 3	0.350 3	0.006 5		304	2	305	6
5	15	327	115	0.35	0.047 8	0.000 3	0.344 3	0.006 2		301	2	300	5
6	444	1 284	712	0.55	0.140 9	0.001 7	11.424 1	0.196 6		850	10	2 558	44
7	57	1 277	139	0.11	0.047 8	0.000 3	0.343 4	0.003 2		301	2	300	3
8	12	276	12	0.04	0.046 9	0.000 3	0.341 8	0.007 8		295	2	299	7
9	45	1 019	100	0.10	0.047 0	0.000 3	0.344 3	0.003 4		296	2	300	3
10	7	153	10	0.06	0.047 5	0.000 3	0.348 7	0.013 2		299	2	304	12
11	48	1 081	102	0.09	0.047 1	0.000 3	0.339 0	0.003 1		297	2	296	3
12	26	558	167	0.30	0.047 4	0.000 3	0.344 6	0.004 9		299	2	301	4
13	9	204	13	0.06	0.047 0	0.000 3	0.337 6	0.012 0		296	2	295	10
14	37	762	672	0.88	0.046 7	0.000 3	0.612 2	0.004 9		294	2	485	4
15	41	903	126	0.14	0.047 4	0.000 3	0.343 2	0.003 4		299	2	300	3
16	43	754	1 170	1.55	0.044 5	0.000 5	0.537 3	0.007 9		281	3	437	6
17	10	230	13	0.06	0.048 0	0.000 3	0.352 5	0.004 5		302	2	307	4
18	63	1 402	156	0.11	0.047 5	0.000 3	0.342 9	0.002 9		299	2	299	3
19	25	529	159	0.30	0.049 2	0.000 3	0.353 5	0.005 0		309	2	307	4
20	12	272	45	0.16	0.047 7	0.000 3	0.346 3	0.007 5		300	2	302	7
21	24	486	282	0.58	0.046 6	0.000 3	0.336 0	0.004 8		294	2	294	4
22	37	790	179	0.23	0.047 4	0.000 3	0.3433	0.004 4		299	2	300	4
23	9	110	276	2.52	0.047 9	0.000 4	0.348 8	0.020 7		302	2	304	18
24	9	193	5	0.03	0.048 2	0.000 3	0.349 9	0.010 7		303	2	305	9
25	22	467	45	0.10	0.049 3	0.000 3	0.355 6	0.003 1		310	2	309	3
26	20	456	20	0.04	0.047 6	0.000 3	0.342 4	0.004 6		300	2	299	4
27	35	731	178	0.24	0.047 8	0.000 3	0.344 7	0.003 4		301	2	301	3
28	34	766	48	0.06	0.047 7	0.000 6	0.343 9	0.018 9		300	4	300	16
29	15	319	77	0.24	0.047 0	0.000 3	0.339 4	0.005 7		296	2	297	5
30	60	1 271	210	0.17	0.048 6	0.000 4	0.565 9	0.009 0		306	3	455	7
31	6	128	11	0.08	0.047 6	0.000 3	0.343 3	0.013 8		300	2	300	12
32	15	335	58	0.17	0.047 4	0.000 3	0.348 3	0.005 7		299	2	303	5
33	17	377	71	0.19	0.047 2	0.000 3	0.346 0	0.005 5		298	2	302	5
34	18	336	184	0.55	0.048 1	0.000 3	0.350 6	0.006 0		303	2	305	5
35	19	435	19	0.04	0.047 3	0.000 3	0.344 5	0.004 9		298	2	301	4
36	28	565	142	0.25	0.049 6	0.000 3	0.618 5	0.007 8		312	2	489	6
37	37	826	56	0.07	0.047 5	0.000 3	0.346 0	0.003 4		299	2	302	3
38	14	295	94	0.32	0.048 0	0.000 3	0.351 6	0.009 8		302	2	306	9
13NM12
1	14	273	230	0.84	0.044 6	0.000 4	0.806 6	0.010 7		281	2	601	8
2	10	173	171	0.99	0.048 7	0.000 3	0.351 4	0.007 0		306	2	306	6
3	9	172	154	0.90	0.048 2	0.000 3	0.350 8	0.011 5		303	2	305	10
4	5	93	66	0.71	0.047 2	0.000 4	0.341 5	0.013 1		297	2	298	11
5	11	203	184	0.91	0.047 0	0.000 3	0.342 2	0.006 0		296	2	299	5
13NM12
6	9	154	187	1.21	0.047 2	0.000 4	0.342 9	0.008 9		298	2	299	8
7	19	307	437	1.42	0.048 0	0.000 3	0.347 7	0.006 6		302	2	303	6
8	11	198	227	1.15	0.047 7	0.000 4	0.350 1	0.006 8		300	2	305	6
9	14	234	368	1.57	0.047 0	0.000 4	0.340 9	0.005 5		296	2	298	5
10	8	148	155	1.05	0.047 4	0.000 4	0.349 5	0.008 3		299	2	304	7
11	11	177	258	1.46	0.047 5	0.000 4	0.342 1	0.007 5		299	2	299	7
12	12	250	79	0.32	0.047 4	0.000 4	0.341 5	0.006 7		298	2	298	6
13	6	110	149	1.35	0.047 0	0.000 4	0.343 7	0.011 9		296	2	300	10
14	36	575	1 316	2.29	0.044 4	0.000 3	0.364 8	0.006 7		280	2	316	6
15	24	437	27	0.06	0.055 0	0.000 4	1.227 6	0.025 5		345	3	813	17
16	12	202	269	1.33	0.047 1	0.000 3	0.339 3	0.007 2		296	2	297	6
17	33	520	1 010	1.94	0.046 8	0.000 3	0.338 2	0.003 4		295	2	296	3
18	16	285	324	1.14	0.047 2	0.000 3	0.345 7	0.005 4		298	2	301	5
19	11	210	201	0.96	0.047 3	0.000 3	0.346 4	0.008 2		298	2	302	7
20	10	188	170	0.90	0.047 1	0.000 3	0.339 1	0.008 6		296	2	296	8
21	17	268	425	1.59	0.047 5	0.000 7	0.346 3	0.025 5		299	4	302	22
22	25	382	574	1.50	0.047 5	0.000 3	0.343 9	0.004 3		299	2	300	4
23	10	178	151	0.85	0.046 8	0.000 3	0.343 4	0.007 5		295	2	300	7
24	13	215	241	1.12	0.047 1	0.000 3	0.343 3	0.008 3	297	2	300	7
25	17	291	279	0.96	0.047 1	0.000 3	0.340 3	0.006 1	296	2	297	5
13NM15
1	11	197	197	1.00	0.047 4	0.000 3	0.343 9	0.009 2	299	2	300	8
2	14	246	249	1.01	0.047 2	0.000 3	0.345 8	0.008 0	297	2	302	7
3	8	152	95	0.63	0.047 8	0.000 3	0.348 3	0.008 6	301	2	303	8
4	8	155	116	0.75	0.047 6	0.000 4	0.343 8	0.011 8	300	2	300	10
5	17	310	227	0.73	0.048 7	0.000 3	0.350 9	0.005 3	307	2	305	5
6	8	151	119	0.78	0.047 9	0.000 3	0.346 4	0.007 8	302	2	302	7
7	9	162	124	0.77	0.046 7	0.000 5	0.339 8	0.028 9	294	3	297	25
8	7	137	87	0.64	0.047 6	0.000 3	0.348 7	0.012 8	300	2	304	11
9	12	212	197	0.93	0.048 9	0.000 3	0.355 9	0.004 4	308	2	309	4
10	10	178	154	0.87	0.048 1	0.000 3	0.348 2	0.006 8	303	2	303	6
11	6	110	86	0.78	0.046 9	0.000 5	0.341 5	0.028 0	295	3	298	24
12	11	196	150	0.76	0.048 3	0.000 3	0.349 1	0.006 5	304	2	304	6
13	9	175	111	0.64	0.047 7	0.000 3	0.346 5	0.009 0	300	2	302	8
14	9	168	125	0.74	0.048 3	0.000 3	0.352 3	0.007 7	304	2	306	7
15	6	124	39	0.32	0.049 3	0.000 3	0.358 6	0.010 7	310	2	311	9
16	9	157	126	0.80	0.047 6	0.000 3	0.343 7	0.010 1	300	2	300	9
17	14	258	186	0.72	0.047 5	0.000 3	0.344 9	0.005 1	299	2	301	4
18	7	140	9	0.06	0.049 3	0.000 3	0.733 8	0.021 5	310	2	559	16
19	8	148	90	0.61	0.047 1	0.000 3	0.340 4	0.011 0	297	2	297	10
20	13	237	178	0.75	0.047 5	0.000 3	0.347 1	0.004 6	299	2	303	4
21	11	193	202	1.04	0.047 0	0.000 3	0.341 2	0.009 9	296	2	298	9
22	11	194	203	1.05	0.047 1	0.000 3	0.343 8	0.008 3	297	2	300	7
23	9	173	162	0.93	0.047 3	0.000 3	0.345 8	0.005 2	298	2	302	5
24	10	182	145	0.80	0.047 0	0.000 3	0.337 7	0.008 1	296	2	295	7
13NM15
25	11	210	152	0.72	0.046 8	0.000 3	0.337 2	0.009 4	295	2	295	8
26	12	230	216	0.94	0.046 7	0.000 3	0.339 4	0.009 6	294	2	297	8
13NM17
1	10	194	122	0.63	0.047 6	0.000 3	0.346 4	0.006 9	300	2	302	6
2	11	189	151	0.80	0.047 7	0.000 3	0.349 2	0.007 2	301	2	304	6
3	10	187	102	0.54	0.048 3	0.000 3	0.348 9	0.007 5	304	2	304	7
4	3	58	37	0.64	0.047 8	0.000 4	0.345 5	0.025 0	301	2	301	22
5	15	269	205	0.76	0.047 8	0.000 3	0.349 4	0.005 1	301	2	304	4
6	18	308	261	0.85	0.049 5	0.000 3	0.358 6	0.004 1	311	2	311	4
7	3	63	22	0.36	0.048 6	0.000 4	0.350 8	0.021 3	306	2	305	19
8	2	42	25	0.59	0.048 9	0.000 4	0.355 8	0.023 4	308	3	309	20
9	11	198	123	0.62	0.047 5	0.000 3	0.343 9	0.008 3	299	2	300	7
10	4	71	38	0.54	0.047 8	0.000 3	0.347 3	0.017 5	301	2	303	15
11	10	183	118	0.65	0.048 2	0.000 3	0.349 6	0.009 4	303	2	304	8
12	14	251	191	0.76	0.048 9	0.000 3	0.351 8	0.004 9	308	2	306	4
13	20	367	303	0.82	0.047 6	0.000 3	0.344 5	0.004 5	300	2	301	4
14	11	210	147	0.70	0.048 1	0.000 3	0.351 2	0.007 1	303	2	306	6
15	9	173	112	0.65	0.048 5	0.000 3	0.348 4	0.008 8	306	2	304	8
16	12	235	136	0.58	0.047 7	0.000 3	0.347 6	0.005 8	300	2	303	5
17	4	92	29	0.32	0.047 6	0.000 3	0.348 5	0.011 1	300	2	304	10
18	19	361	299	0.83	0.048 1	0.000 5	0.350 0	0.009 3	303	3	305	8
19	19	344	352	1.02	0.048 1	0.000 3	0.349 4	0.004 3	303	2	304	4
20	7	155	10	0.06	0.048 0	0.000 3	0.352 0	0.009 9	302	2	306	9
21	14	272	229	0.84	0.047 9	0.000 3	0.347 7	0.006 1	302	2	303	5
22	19	349	305	0.87	0.048 2	0.000 3	0.352 1	0.004 6	303	2	306	4
23	7	128	99	0.78	0.046 9	0.000 3	0.340 1	0.012 2	295	2	297	11
24	6	111	75	0.67	0.048 2	0.000 3	0.350 7	0.016 4	304	2	305	14
25	5	83	75	0.90	0.047 7	0.000 4	0.344 1	0.021 8	300	2	300	19
26	5	94	65	0.69	0.047 0	0.000 3	0.343 2	0.018 1	296	2	300	16
27	3	54	24	0.45	0.047 7	0.000 4	0.347 9	0.029 3	300	2	303	26
28	6	121	58	0.48	0.047 6	0.000 3	0.345 0	0.011 2	300	2	301	10
29	3	62	27	0.44	0.047 9	0.000 4	0.346 6	0.020 2	302	2	302	18

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表 2 二连-东乌旗地区晚石炭世碱性花岗岩主微量元素分析结果

Table 2. Major(%) and trace element (10^-6) data of Erlian-Dongwuqi Late Carboniferous alkaline granites

送样号	14SZ31	14SZ32	14SZ33	14SZ37	14SZ38	P12YQ5*	P14YQ4*	P14YQ6*	YQ4673-1-2*	YQ5709-1-2*	YQ4721-1-2*	YQ4765-1-2*	YQ4627-1-2*
红格尔
SiO₂	74.29	74.61	74.80	76.39	75.96	73.89	74.61	74.79	75.15	75.79	74.71	75.58	74.60
TiO₂	0.19	0.14	0.15	0.06	0.06	0.19	0.17	0.18	0.19	0.16	0.19	0.14	0.20
Al₂O₃	13.06	13.53	12.91	12.86	12.76	12.76	12.44	12.94	12.24	11.97	12.74	12.31	12.41
Fe₂O₃	1.69	1.60	1.82	1.24	1.13	1.41	1.46	1.10	1.24	1.14	1.31	1.17	1.16
FeO	0.57	0.11	0.31	0.12	0.18	1.17	0.93	0.57	1.05	1.01	0.93	0.79	1.15
FeO_T	2.09	1.55	1.95	1.24	1.20	2.44	2.24	1.56	2.17	2.04	2.11	1.84	2.19
MnO	0.06	0.03	0.04	0.02	0.02	0.08	0.07	0.04	0.07	0.07	0.06	0.05	0.07
MgO	0.12	0.12	0.13	0.07	0.10	0.08	0.08	0.06	0.06	0.05	0.07	0.04	0.06
CaO	0.25	0.28	0.29	0.08	0.43	0.27	0.36	0.28	0.24	0.28	0.26	0.27	0.42
Na₂O	4.38	4.15	4.01	4.28	4.36	4.27	4.32	4.30	4.05	4.20	4.50	4.26	4.26
K₂O	4.99	5.03	5.03	4.54	4.54	5.05	4.91	5.13	4.96	4.58	4.76	4.84	4.87
P₂O₅	0.08	0.08	0.06	0.02	0.01	0.11	0.04	0.02	0.14	0.1	0.03	0.02	0.03
LOI	0.26	0.31	0.41	0.31	0.43	0.64	0.51	0.51	0.53	0.58	0.39	0.47	0.69
V	3.67	2.19	18.30	2.88	4.83	10.20	10.00	8.50	9.50	9.30	13.50	11.00	8.80
Cr	1.84	1.28	3.23	2.11	1.73	21.00	20.30	21.10	3.70	4.20	6.50	4.20	3.80
Co	0.28	0.38	0.57	0.24	0.23	0.74	0.70	0.57	1.10	1.00	0.50	0.50	0.40
Ni	0.76	0.71	2.23	1.24	1.15	8.90	8.20	9.00	1.80	2.00	1.20	2.90	1.50
Ga	22.00	17.80	20.00	18.80	23.40	29.60	28.40	30.10	25.47	25.32	26.32	26.56	25.04
Cs	6.67	44.30	4.26	28.00	22.70	6.65	7.47	3.56	9.87	7.94	5.54	8.58	5.06
Rb	267.00	300.00	182.00	406.00	481.00	241.20	289.20	210.80	213.70	211.90	230.50	224.30	202.00
Ba	65.30	24.10	72.30	18.70	32.50	162.70	155.50	86.20	97.70	208.60	129.80	87.40	82.70
Th	37.50	28.90	13.20	15.90	20.40	32.42	21.96	21.13	21.37	19.27	25.46	27.00	27.87
U	5.25	5.72	2.20	2.13	2.15	4.50	2.22	3.72	3.16	3.40	2.52	3.32	4.46
Nb	60.30	34.50	10.80	23.90	35.80	58.15	37.70	40.36	35.73	33.05	35.96	37.14	35.96
Ta	6.41	2.96	0.78	2.62	2.99	4.57	2.43	3.12	2.21	2.04	3.36	3.27	3.02
La	24.50	18.70	37.00	8.50	16.70	47.92	84.71	43.52	43.31	88.22	19.00	25.77	49.10
Ce	176.00	62.80	98.80	21.20	38.20	105.60	140.50	85.35	131.00	241.90	85.58	89.78	125.00
Pr	9.57	8.52	15.10	3.21	6.01	16.96	24.38	11.26	14.88	23.27	6.28	8.82	14.72
Sr	20.00	19.00	23.00	14.00	15.00	18.00	15.80	11.10	17.20	27.10	20.30	13.80	14.90
Nd	35.90	29.90	57.50	10.70	22.30	59.70	89.47	41.04	52.04	83.45	22.57	32.74	52.23
Zr	1 030.00	268.00	260.00	205.00	204.00	592.50	574.30	531.50	543.30	444.10	470.30	511.70	610.70
Hf	20.90	10.60	7.27	9.42	9.64	30.44	28.60	29.57	23.64	18.29	22.38	22.78	27.54
Sm	7.67	6.92	11.00	2.12	5.56	12.41	18.72	9.17	10.14	15.71	5.07	7.06	10.81
Eu	0.16	0.18	0.23	0.02	0.05	0.44	0.42	0.82	0.37	0.55	0.22	0.30	0.33
Gd	7.60	6.88	9.97	1.80	5.58	9.07	13.98	7.54	7.92	12.11	4.53	5.86	9.76
Tb	1.36	1.38	1.61	0.28	1.11	1.79	2.52	1.50	1.54	2.15	1.01	1.21	2.04
Dy	8.77	9.09	9.31	1.63	7.16	12.81	16.19	10.16	10.69	13.32	7.40	8.39	14.30
Y	46.00	52.00	44.40	7.04	41.40	63.13	67.54	52.45	57.55	66.65	41.20	47.50	81.06
Ho	1.83	1.87	1.82	0.32	1.51	2.76	3.20	2.17	2.22	2.67	1.66	1.74	3.07
Er	5.66	5.69	5.09	0.99	4.65	8.17	8.60	6.44	6.51	7.31	5.06	5.02	8.78
Tm	0.85	0.86	0.71	0.16	0.76	1.68	1.62	1.27	1.17	1.30	1.03	0.96	1.55
Yb	5.58	5.96	4.01	1.01	4.80	11.49	11.14	8.71	8.05	8.75	7.49	7.16	10.69
Lu	0.84	0.89	0.56	0.15	0.69	1.41	1.31	1.13	1.33	1.39	1.25	1.33	1.78
10⁴Ga/ Al	3.18	2.49	2.93	2.76	3.46	4.38	4.31	4.39	3.93	4.00	3.90	4.08	3.81
A/CNK	1.00	1.06	1.03	1.06	0.99	0.98	0.95	0.99	0.98	0.97	0.98	0.97	0.95
Eu*	0.06	0.08	0.07	0.03	0.03	0.13	0.08	0.30	0.13	0.12	0.14	0.14	0.10
T_Zr	973	837	831	814	806	908	901	897	901	879	883	893	908

送样号	YQ4965-1-2*	YQ5728-1-2*	YQ4918-1-2*	13NM-5	13NM-7	13NM12	13NM15	13NM17	P17YQ1**	P17YQ2**	P17YQ3**	P17YQ4**	P17YQ5**
	红格尔			祖横得楞				那仁宝力格
SiO₂	75.43	74.92	74.72	76.29	75.41	77.38	73.15	75.76	76.94	76.36	76.22	76.75	76.58
TiO₂	0.15	0.21	0.20	0.22	0.25	0.22	0.35	0.20	0.12	0.14	0.13	0.12	0.13
Al₂O₃	12.67	12.43	12.63	9.86	12.39	11.28	13.39	12.09	11.45	11.71	11.85	11.78	11.77
Fe₂O₃	0.94	1.25	1.28	3.33	1.66	1.55	1.81	1.45	1.12	1.05	0.89	0.73	0.85
FeO	0.65	1.05	0.92	0.26	0.17	0.14	0.26	0.65	0.72	0.95	0.84	0.88	0.69
FeO_t	1.50	2.17	2.07	3.26	1.66	1.54	1.89	1.95	1.73	1.89	1.64	1.54	1.45
MnO	0.04	0.06	0.07	0.15	0.09	0.06	0.09	0.09	0.04	0.06	0.05	0.04	0.04
MgO	0.04	0.05	0.08	0.14	0.14	0.11	0.23	0.10	0.10	0.08	0.06	0.06	0.07
CaO	0.27	0.29	0.29	0.33	0.24	0.18	0.29	0.16	0.18	0.21	0.22	0.16	0.24
Na₂O	4.36	4.20	4.28	4.21	4.36	4.01	4.78	4.79	4.07	4.15	4.38	4.19	4.25
K₂O	4.94	5.00	5.01	4.33	4.83	4.40	5.35	4.28	4.60	4.62	4.71	4.76	4.70
P₂O₅	0.03	0.04	0.03	0.04	0.07	0.03	0.05	0.02	0.01	0.01	0.01	0.01	0.01
LOI	0.43	0.43	0.41	0.63	0.30	0.56	0.19	0.31	0.44	0.45	0.42	0.29	0.47
V	10.50	9.50	9.90	21.05	23.61	22.33	26.36	24.91	14.50	12.20	13.20	9.10	13.40
Cr	4.20	4.10	4.80	2.80	3.68	3.62	3.57	3.72	2.60	2.50	2.60	2.40	2.90
Co	0.50	0.30	0.50	0.52	0.77	0.73	0.37	0.68	0.60	0.60	0.40	0.20	0.40
Ni	1.20	1.00	1.70	1.77	3.33	2.04	0.73	1.39	1.70	1.30	1.30	0.90	1.50
Ga	28.12	23.79	25.93	25.77	24.35	22.14	25.28	23.31	21.85	22.19	23.20	20.89	22.61
Cs	9.28	4.34	4.16	1.66	2.60	3.58	1.27	0.56	2.66	3.24	4.57	3.18	4.56
Rb	265.20	174.90	189.60	229.46	122.21	122.10	104.06	64.35	105.10	113.20	117.80	114.50	115.70
Ba	118.70	92.50	101.80	87.54	85.60	166.08	123.84	144.96	28.00	34.40	38.20	16.30	29.70
Th	42.63	33.78	20.54	35.80	11.88	16.96	8.67	5.30	10.65	11.76	9.44	8.14	8.46
U	6.00	3.03	2.27	3.47	1.61	1.55	0.82	1.14	1.04	1.68	0.98	0.79	0.97
Nb	48.59	34.55	30.58	31.12	21.54	17.65	16.06	20.85	18.13	24.10	22.01	15.66	21.06
Ta	4.57	2.48	1.86	2.29	1.19	1.02	0.86	1.15	1.20	1.66	0.90	0.77	0.94
La	29.51	31.13	35.40	50.29	31.75	37.40	46.22	46.47	13.49	8.76	14.50	17.32	14.15
Ce	80.68	147.30	69.76	113.19	69.20	78.71	103.47	101.19	32.57	68.45	39.69	43.20	33.18
Pr	9.57	10.49	9.74	14.83	8.90	11.08	14.68	12.93	4.55	3.36	4.72	5.13	4.19
Sr	17.00	13.80	14.20	10.20	14.23	14.14	10.35	9.63	5.60	5.90	7.30	3.80	6.10
Nd	36.08	36.74	36.05	57.20	34.10	44.25	58.61	48.65	19.11	13.30	18.35	19.50	16.52
Zr	388.00	578.50	546.10	1 225.72	533.67	425.80	364.28	574.44	382.00	475.80	403.70	376.00	370.60
Hf	20.20	26.91	24.16	29.62	15.17	11.80	12.29	14.43	15.41	18.29	14.45	13.90	13.74
Sm	8.48	7.89	7.45	14.25	7.58	10.88	12.18	10.23	5.19	4.23	4.92	4.77	4.11
Eu	0.24	0.23	0.20	2.00	0.80	1.75	1.74	1.17	0.19	0.10	0.13	0.11	0.11
Gd	7.70	6.89	6.38	15.23	7.74	10.41	10.52	9.76	4.94	4.46	4.87	4.57	4.07
Tb	1.66	1.41	1.29	3.21	1.50	2.02	1.84	1.76	1.09	1.05	1.08	0.97	0.91
Dy	11.40	9.33	8.31	21.01	9.81	12.53	10.42	10.78	7.34	7.28	7.31	6.51	6.45
Y	54.96	47.72	43.07	122.00	59.48	83.39	53.15	62.28	43.50	42.90	45.96	37.00	41.77
Ho	2.26	1.96	1.73	4.09	1.89	2.31	1.83	2.00	1.50	1.50	1.53	1.31	1.35
Er	6.43	5.64	4.86	13.19	5.91	7.31	5.33	6.37	4.76	4.55	4.51	4.02	4.07
Tm	1.16	1.03	0.85	2.42	1.03	1.24	0.81	1.12	0.81	0.82	0.77	0.72	0.70
Yb	8.22	7.25	5.86	16.48	7.13	7.86	5.15	7.40	6.12	6.06	5.47	5.38	4.89
Lu	1.40	1.20	0.94	3.05	1.33	1.29	0.83	1.53	1.12	1.16	0.99	0.97	0.89
10⁴Ga/Al	4.19	3.62	3.88	4.94	3.71	3.71	3.57	3.64	3.60	3.58	3.70	3.35	3.63
A/CNK	0.97	0.97	0.97	0.81	0.97	0.97	0.94	0.94	0.95	0.96	0.93	0.95	0.94
Eu*	0.09	0.10	0.09	0.41	0.32	0.50	0.47	0.36	0.11	0.07	0.08	0.07	0.08
T_Zr	864	905	899	967	896	877	850	902	864	886	865	861	858
注：数据来源：内蒙古1∶5万达如嘎呼都格等六幅区域地质调查报告；*内蒙古1∶5万翁根温多尔等六幅区域地质调查报告.

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表 3 二连-东乌旗地区晚石炭世碱性花岗岩锆石Hf同位素组成

Table 3. Hf isotopic compositions for zircons of Late Carboniferous alkaline granites from Erlian-Dongwuqi region

分析点	t (Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf_i	εHf(t)	T_DM^C (Ma)	f_Lu/Hf
13NM5.1	299	0.264 280	0.003 486	0.283 031	0.000 023	0.283 012	15.1	375	-0.89
13NM5.2	299	0.025 209	0.000 539	0.283 003	0.000 016	0.283 000	14.6	414	-0.98
13NM5.9	299	0.021 086	0.000 433	0.283 002	0.000 015	0.282 999	14.6	415	-0.99
13NM5.13	299	0.033 421	0.000 829	0.283 013	0.000 017	0.283 008	14.9	387	-0.98
13NM5.14	299	0.014 886	0.000 340	0.282 991	0.000 012	0.282 989	14.3	447	-0.99
13NM5.15	299	0.031 468	0.000 658	0.282 962	0.000 011	0.282 958	13.2	547	-0.98
13NM5.16	299	0.011 837	0.000 264	0.283 009	0.000 013	0.283 007	14.9	390	-0.99
13NM5.19	299	0.041 749	0.000 824	0.282 996	0.000 017	0.282 992	14.3	440	-0.98
13NM5.21	299	0.013 464	0.000 307	0.283 023	0.000 013	0.283 021	15.4	345	-0.99
13NM5.22	299	0.025 084	0.000 528	0.282 984	0.000 015	0.282 981	14.0	473	-0.98
13NM5.23	299	0.072 231	0.001 303	0.283 013	0.000 020	0.283 005	14.8	396	-0.96
13NM5.25	299	0.247 189	0.004 442	0.283 041	0.000 048	0.283 016	15.2	361	-0.87
13NM5.26	299	0.027 325	0.000 578	0.282 983	0.000 016	0.282 980	13.9	479	-0.98
13NM5.27	299	0.035 935	0.000 686	0.282 929	0.000 017	0.282 925	12.0	655	-0.98
13NM5.29	299	0.031 241	0.000 477	0.283 001	0.000 016	0.282 999	14.6	418	-0.99
13NM5.31	299	0.333 987	0.004 337	0.282 915	0.000 034	0.282 891	10.8	764	-0.87
13NM5.32	299	0.048 377	0.000 787	0.282 954	0.000 021	0.282 950	12.9	576	-0.98
13NM5.38	299	0.015557	0.000 237	0.282 960	0.000 020	0.282 959	13.2	545	-0.99
13NM5.40	299	0.016 769	0.000 360	0.282 955	0.000 015	0.282 953	13.0	564	-0.99
13NM12.1	297	0.204 046	0.004 168	0.283 014	0.000 026	0.282 990	14.3	446	-0.87
13NM12.2	297	0.203 691	0.004 253	0.282 976	0.000 027	0.282 953	12.9	568	-0.87
13NM12.3	297	0.163 312	0.003 622	0.282 989	0.000 023	0.282 969	13.5	515	-0.89
13NM12.5	297	0.151 281	0.003 595	0.282 960	0.000 025	0.282 940	12.5	609	-0.89
13NM12.8	297	0.123 949	0.002 917	0.282 969	0.000 023	0.282 953	12.9	569	-0.91
13NM12.10	297	0.173 087	0.004 650	0.282 978	0.000 022	0.282 952	12.9	571	-0.86
13NM12.11	297	0.161 938	0.003 684	0.282 904	0.000 025	0.282 883	10.5	792	-0.89
13NM12.13	297	0.178 470	0.004 711	0.283 041	0.000 021	0.283 014	15.1	369	-0.86
13NM12.14	297	0.125 040	0.003 083	0.282 997	0.000 027	0.282 979	13.9	482	-0.91
13NM12.17	297	0.154 522	0.004 236	0.282 894	0.000 022	0.282 870	10.0	833	-0.87
13NM12.21	297	0.133 204	0.003 394	0.282 978	0.000 029	0.282 959	13.2	547	-0.90
13NM12.22	297	0.168 386	0.004 348	0.283 033	0.000 031	0.283 008	14.9	389	-0.87
13NM12.26	297	0.218 615	0.004 949	0.282 914	0.000 042	0.282 886	10.6	783	-0.85
13NM15.8	299	0.139 022	0.003 144	0.282 985	0.000 025	0.282 967	13.5	519	-0.91
13NM15.13	299	0.166 716	0.004 284	0.282 958	0.000 024	0.282 935	12.3	624	-0.87
13NM15.16	299	0.152 383	0.003 568	0.283 011	0.000 027	0.282 991	14.3	441	-0.89
13NM15.24	299	0.156 382	0.003 593	0.282 955	0.000 025	0.282 935	12.4	622	-0.89
13NM15.29	299	0.151 167	0.003 833	0.283 035	0.000 029	0.283 013	15.1	370	-0.88
13NM15.31	299	0.217 345	0.005 831	0.283 003	0.000 027	0.282 970	13.6	510	-0.82
13NM17.2	302	0.270 771	0.005 613	0.282 854	0.000 036	0.282 822	8.4	782	-0.83
13NM17.3	302	0.280 976	0.005 665	0.282 985	0.000 036	0.282 953	13.0	485	-0.83
13NM17.4	302	0.145 798	0.004 265	0.282 964	0.000 031	0.282 939	12.6	515	-0.87
13NM17.7	302	0.103 037	0.002 381	0.282 882	0.000 023	0.282 869	10.1	676	-0.93
13NM17.9	302	0.287 090	0.006 648	0.282 849	0.000 033	0.282 811	8.0	806	-0.80
13NM17.10	302	0.112 713	0.002 459	0.282 983	0.000 022	0.282 969	13.6	447	-0.93
13NM17.13	302	0.301 077	0.006 241	0.283 027	0.000 035	0.282 992	14.4	396	-0.81
13NM17.15	302	0.264 664	0.005 522	0.282 996	0.000 034	0.282 965	13.5	457	-0.83
13NM17.21	302	0.208 791	0.005 230	0.282 954	0.000 030	0.282 924	12.0	550	-0.84
13NM17.22	302	0.238 405	0.006 420	0.282 960	0.000 027	0.282 924	12.0	550	-0.81
注：ε_Hf(0)=[(¹⁷⁶Hf/¹⁷⁷Hf) _s/(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}-1]×10 000; ε_Hf(t)={[(¹⁷⁶Hf/¹⁷⁷Hf)_s-/(¹⁷⁶Lu/¹⁷⁷Hf)_s×(e^λt-1)]/[ (¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}-(¹⁷⁶Lu/¹⁷⁷Hf)_s×(e^λt-1)]-1}×10 000; T_DM=1/λ×ln{1+ [(¹⁷⁶Hf/¹⁷⁷Hf)_s-(¹⁷⁶Hf/¹⁷⁷Hf)_DM]/[(¹⁷⁶Lu/¹⁷⁷Hf)_s-(¹⁷⁶Lu/¹⁷⁷Hf)_DM]; T_DM^C=T_DM-(T_DM-t)×[(f_cc-f_s)/(f_cc-f_DM)]; f_s= (¹⁷⁶Lu/¹⁷⁷Hf)_s/[(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1; 其中(¹⁷⁶Lu¹⁷⁷Hf)_s和(¹⁷⁶Hf/¹⁷⁷Hf)_s为样品测定值，(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR=0.033 2, (¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}=0.282 772; (¹⁷⁶Lu/¹⁷⁷Hf)_DM =0.038 4, (¹⁷⁶Hf/¹⁷⁷Hf)_DM =0.283 25. f_cc, f_s, f_DM分别为大陆平均地壳、样品和亏损地幔的f_Lu/Hf, f_cc =-0.55, f_DM =0.16. t为样品成岩年龄, λ=1.867×10^-11 a^-1.

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表 4 内蒙古祖横得楞碱性花岗岩Nd同位素数据

Table 4. Nd isotopic data of Zuhengdeleng alkaline granites, Inner Mongolia

样品号	t(Ma)	Sm(10^-6)	Nd(10^-6)	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(t)	T_DM2(Ma)	f_Sm/Nd
13NM5	299	14.25	57.20	0.154 333	0.512 880	0.512 577	6.3	547	-0.22
13NM12	298	10.88	44.25	0.152 355	0.512 863	0.512 564	6.1	567	-0.23
13NM15	299	12.18	58.61	0.128 726	0.512 812	0.512 559	6.0	575	-0.35
13NM17	302	10.23	48.65	0.130 220	0.512 849	0.512 593	6.7	521	-0.34

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内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义

doi: 10.3799/dqkx.2021.081

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王树庆（1983-），男，高级工程师，从事兴蒙造山带地质调查与研究工作.ORCID：0000-0002-4973-7535. E-mail：89617984@qq.com

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Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance

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内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义

doi: 10.3799/dqkx.2021.081

作者简介: 王树庆（1983-），男，高级工程师，从事兴蒙造山带地质调查与研究工作.ORCID：0000-0002-4973-7535. E-mail：89617984@qq.com

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Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance

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作者简介:
王树庆（1983-），男，高级工程师，从事兴蒙造山带地质调查与研究工作.ORCID：0000-0002-4973-7535. E-mail：89617984@qq.com