大兴安岭中段内蒙古扎赉特旗地区石炭纪高镁闪长岩、埃达克岩的发现及其对嫩江洋俯冲作用的指示

庞雪娇; 付俊彧; 钱程; 杨晓平; 汪岩

doi:10.12097/gbc.2023.09.019

大兴安岭中段内蒙古扎赉特旗地区石炭纪高镁闪长岩、埃达克岩的发现及其对嫩江洋俯冲作用的指示

1.
中国地质调查局沈阳地质调查中心, 辽宁沈阳110034

2.
东北地质科技创新中心, 辽宁沈阳110034

基金项目: 中国地质调查局项目《东北地区数据更新及地质编图》 (编号：DD20230224)、《东北地区基础地质图件更新》（编号：DD20221632-05）

详细信息

作者简介: 庞雪娇（1984− ），女，硕士，高级工程师，从事区域地质、侵入岩地质及综合编图工作。E−mail：pangxjsy@foxmail.com

通讯作者: 付俊彧（1966− ），男，正高级工程师，从事区域地质、大地构造研究。E−mail：fjyzxy@163.com

中图分类号: P534.45; P588.12⁺2

收稿日期: 2023-09-14

修回日期: 2024-02-24

刊出日期: 2024-08-15

The discovery of Carboniferous high-Mg diorites and adakites in the Jalaid Banner area, the central Great Xing'an Range and their implications for the subduction of the Nenjiang ocean

1.
Shenyang Center, China Geological Survey, Shenyang 110034, Liaoning, China

2.
Northeast Geological S&T Innovation Center, China Geological Survey, Shenyang 110034, Liaoning, China

More Information

Corresponding author: FU Junyu, fjyzxy@163.com

Received Date: 14 September 2023

Revised Date: 24 February 2024

Publish Date: 15 August 2024

摘要

摘要:
扎赉特旗地区的晚古生代岩浆作用，对于揭示嫩江洋的俯冲过程与机制具有重要的约束意义。通过野外地质调查、岩石学、岩石地球化学和锆石U−Pb定年研究，在扎赉特旗元宝山和贾家屯地区新发现了晚石炭世早期的高镁闪长岩（年龄加权平均值为320.5±1.2 Ma）和O型埃达克岩（年龄加权平均值为317.9±3.3 Ma）。元宝山高镁闪长岩具有低SiO₂、高MgO、高Mg^#和富Na₂O的特点，且Ni、Cr含量高，富集轻稀土元素和大离子亲石元素，亏损高场强元素，认为其形成于消减带之上的地幔楔环境，是由消减板片部分熔融衍生的富Si质流体交代地幔岩部分熔融形成的。贾家屯石英闪长岩具有高SiO₂、富Na₂O、高Sr和低Yb、Y的特点，K₂O/Na₂O值低，稀土元素强烈分异，富集轻稀土元素和大离子亲石元素，亏损高场强元素，无负Eu异常，且贫Mg、Cr、Ni，为消减板片部分熔融后经结晶分异形成的O型埃达克岩。新发现的晚石炭世早期的埃达克岩−赞岐岩组合，与研究区石炭纪花岗岩的形成时间(333～304 Ma)同步，且高镁闪长岩与辉长岩（325.2～317.3 Ma）伴生，反映扎赉特旗地区处于松嫩地块西缘的活动大陆边缘弧环境，推测嫩江洋至少从晚石炭世早期开始就存在向东南侧松嫩地块之下的俯冲作用。
- 扎赉特旗 /
- 石炭纪 /
- 高镁闪长岩 /
- 埃达克岩 /
- 俯冲作用 /
- 地质调查工程
Abstract:
The Late Paleozoic magmatism in the Jalaid Banner area is of great constraint significance in revealing the subduction process and closure mechanism of the Nenjiang ocean. Through field geological survey, petrology, rock geochemistry and zircon U−Pb dating, early Late Carboniferous high−Mg diorites (weighted average age 320.5±1.2 Ma) and O−type adakites (weighted average age 317.9±3.3 Ma) have been discovered in Yuanbaoshan and Jiajiatun, Jalaid Banner. The Yuanbaoshan high−Mg diorite is characterized by low SiO₂, high MgO, high Mg^#, rich Na₂O, and high Ni and Cr contents. It is rich in light rare earth elements (LREE) and large ion lithophilic elements (LILE), loss of high field strength elements (HFSE). It is considered that the partial melting of subduction plates results in the formation of Si−rich fluids, which displace mantle rocks and cause them to form after partial melting. The Jiajiatun quartz diorite is characterized by high SiO₂, Na₂O, Sr and low Yb, Y, K₂O/Na₂O, strong REE differentiation, enrichment of LREE and LILE, loss of HFSE, no negative Eu anomaly, poor Mg, Cr, Ni. It is an O−type adakite which formed by partial melting of subtractive plates and crystallization differentiation. The newly discovered adakite−Sanukite rock assemblage in the early Late Carboniferous is consistent with the formation time of the Carboniferous granite in the study area (333~304 Ma), and the high−Mg diorite is associated with gabbro (325.2~317.3 Ma). It is considered that the Jalaid Banner area was located in the active continental margin arc at the western edge of the Songnen massif during this period. At least since the early Late Carboniferous, the Nenjing ocean has been subducted to the southeast beneath the Songnen massif.
- Jalaid Banner /
- Carboniferous /
- high-Mg diorite /
- adakite /
- subduction /
- geological survey engineering

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图 1 扎赉特旗地区地质简图（a）和中国东北地区大地构造单元划分简图（b，据潘桂棠等，2009修改）

Figure 1.

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图 2 扎赉特旗地区元宝山闪长岩（a，b）和贾家屯石英闪长岩（c，d）手标本和显微照片

Figure 2.

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图 3 锆石阴极发光（CL）图像和U−Pb测年谐和图

Figure 3.

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图 4 扎赉特旗地区闪长岩和石英闪长岩TAS硅−碱图解（据Middlemost, 1994）

Figure 4.

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图 5 扎赉特旗地区闪长岩和石英闪长岩主量元素变异图

Figure 5.

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图 6 扎赉特旗地区闪长岩和石英闪长岩球粒陨石标准化稀土元素配分图（a）和原始地幔标准化微量元素蛛网图（b）（标准化值据Sun et al., 1989；白音宝力道埃达克岩数据据张炯飞等，2004；西藏松多高镁闪长岩数据据张雨轩等，2018；日本Kyushu岛赞岐岩数据据Kamei et al., 2004；日本Adak岛埃达克岩数据据Kay，1978）

Figure 6.

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图 7 扎赉特旗地区闪长岩和石英闪长岩的高镁安山岩分类图解（底图据Kamei et al.,2004）

Figure 7.

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图 8 δEu−（La/Yb）_N变异图解（a）和δEu−（K₂O+Na₂O）变异图解（b）（底图据Chappell,1999）

Figure 8.

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图 9 微量元素Yb−La/Yb (a，底图据Yogodzinski et al., 1995) 与Y−Sr/Y (b，底图据Smithies et al., 2000)关系图解

Figure 9.

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图 10 贾家屯石英闪长岩哈克图解

Figure 10.

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图 11 扎赉特旗地区闪长岩和石英闪长岩Y−Nb (a)和Yb−Ta(b)构造环境判别图解(据Pearce et al.,1984）

Figure 11.

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图 12 Zr−（Nb/Zr）_N(a)和Ta/Yb−Th/Yb(b)构造环境判别图解（a据Thiéblemont et al., 1994；b据Middlemost, 1994）

Figure 12.

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表 1 扎赉特旗地区闪长岩和石英闪长岩锆石LA−ICP−MS U−Th−Pb 分析结果

Table 1. Zircon LA−ICP−MS U−Th−Pb data of the diorite and quartz diorite in the Jalaid Banner

点号	含量/10^－6			Th/U	同位素比值				年龄/Ma
点号	Pb	Th	U	Th/U	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
元宝山闪长岩（G17001b2）
1	40	94	95	1.00	0.372	0.0136	0.0513	0.0009	321	10	322	6
2	55	127	159	0.80	0.3691	0.0123	0.0518	0.0011	319	9	325	7
3	48	113	123	0.92	0.3727	0.0126	0.0509	0.0012	322	9	320	8
4	29	64	88	0.73	0.402	0.0288	0.0498	0.0012	343	21	313	8
5	20	43	83	0.52	0.3774	0.0116	0.0518	0.0012	325	9	325	7
6	16	35	63	0.55	0.3736	0.0239	0.0516	0.0012	322	18	325	7
7	22	49	88	0.56	0.3779	0.0153	0.0517	0.0016	326	11	325	10
8	185	450	278	1.62	0.3704	0.012	0.0516	0.0015	320	9	324	9
9	33	82	82	0.99	0.3633	0.0124	0.0504	0.001	315	9	317	6
10	153	381	244	1.56	0.3667	0.0117	0.0511	0.0011	317	9	321	7
11	47	111	108	1.03	0.3823	0.014	0.053	0.0014	329	10	333	9
12	23	51	98	0.52	0.3775	0.0129	0.0526	0.0013	325	10	330	8
13	69	167	173	0.96	0.3622	0.0101	0.05	0.001	314	8	315	6
14	37	83	119	0.70	0.3707	0.0119	0.0519	0.0011	320	9	326	7
15	48	116	134	0.87	0.3639	0.0118	0.051	0.0012	315	9	321	7
16	149	359	250	1.43	0.356	0.0088	0.0496	0.0007	309	7	312	4
17	9	21	33	0.63	0.3715	0.02	0.0512	0.0014	321	15	322	8
18	28	64	72	0.89	0.3812	0.0168	0.0524	0.0015	328	12	329	9
19	253	592	310	1.91	0.3972	0.0127	0.0525	0.0014	340	9	330	9
20	26	58	73	0.79	0.3798	0.0217	0.0515	0.0016	327	16	324	10
21	52	126	103	1.22	0.3598	0.0117	0.0501	0.001	312	9	315	6
22	97	239	173	1.38	0.3602	0.0097	0.0501	0.0009	312	7	315	6
23	68	155	144	1.08	0.3827	0.0118	0.0525	0.0013	329	9	330	8
24	133	322	274	1.18	0.3673	0.0109	0.0511	0.0012	318	8	321	8
25	52	121	129	0.94	0.3629	0.0101	0.05	0.0009	314	8	315	6
26	96	229	207	1.10	0.3679	0.0099	0.0511	0.0011	318	7	321	7
27	29	71	77	0.93	0.3627	0.0126	0.0498	0.0009	314	9	313	6
28	95	208	308	0.68	0.3837	0.0108	0.0531	0.0014	330	8	333	8
29	10	20	46	0.43	0.3842	0.016	0.0527	0.0015	330	12	331	10
30	19	42	66	0.63	0.3744	0.0134	0.0516	0.0011	323	10	325	7
贾家屯石英闪长岩（G17006b3）
1	32	71	56	1.27	0.4635	0.0425	0.0493	0.0012	387	30	310	7
*2	19	44	43	1.03	0.3844	0.019	0.0531	0.0015	330	14	333	9
3	38	94	64	1.47	0.368	0.0231	0.0495	0.0011	318	17	311	7
4	73	178	178	1.00	0.3698	0.0141	0.051	0.0013	320	11	321	8
5	40	102	95	1.07	0.3531	0.0122	0.0492	0.0011	307	9	310	7
6	73	181	141	1.28	0.3814	0.0197	0.0518	0.0012	328	15	326	7
7	48	104	252	0.41	0.37	0.0111	0.0515	0.0016	320	8	324	10
8	39	99	101	0.98	0.3639	0.0128	0.0503	0.0012	315	10	317	7
9	28	69	53	1.31	0.3749	0.0156	0.051	0.0012	323	12	321	7
10	118	292	227	1.29	0.3804	0.0138	0.0514	0.0015	327	10	323	9
11	33	81	78	1.04	0.3758	0.0135	0.0517	0.0015	324	10	325	9
*12	312	118	377	0.31	4.1867	0.088	0.2901	0.0059	1671	18	1642	30
13	69	174	218	0.80	0.3545	0.0105	0.0496	0.0011	308	8	312	7
14	38	96	87	1.10	0.363	0.0126	0.0502	0.0012	315	9	316	8
*15	215	492	229	2.15	0.4244	0.0123	0.0578	0.0014	359	9	362	9
16	37	91	112	0.82	0.3676	0.0132	0.0505	0.0013	318	10	317	8
17	173	451	221	2.04	0.3623	0.012	0.0504	0.0012	314	9	317	7
18	41	98	160	0.62	0.375	0.014	0.0524	0.0016	323	10	329	10
*19	324	618	523	1.18	0.5071	0.013	0.0676	0.0014	417	9	422	9
20	43	116	56	2.07	0.3557	0.014	0.0486	0.0011	309	11	306	7
21	127	326	362	0.91	0.3538	0.0101	0.0497	0.0012	308	8	312	8
22	27	65	68	0.95	0.3796	0.0327	0.051	0.0011	327	24	321	7
23	32	77	79	0.98	0.3792	0.014	0.0506	0.0012	327	10	318	7
*24	10	18	16	1.14	0.6738	0.0564	0.0536	0.0017	523	34	336	11
25	64	171	115	1.49	0.3584	0.0231	0.0493	0.0011	311	17	310	7
26	20	49	46	1.07	0.3589	0.0168	0.0512	0.0014	311	13	322	9
27	17	42	46	0.91	0.3674	0.0172	0.0506	0.0013	318	13	318	8
28	150	378	215	1.75	0.3703	0.0113	0.0515	0.0011	320	8	324	7
29	35	86	86	0.99	0.3699	0.0144	0.0513	0.0013	320	11	323	8
30	39	96	106	0.91	0.3709	0.0134	0.0513	0.0013	320	10	323	8
注：标注*的数据表示在计算年龄加权平均值及绘制锆石U−Pb谐和图时舍弃的数据，可能由于普通铅过高等原因，使年龄值偏离谐和线

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表 2 扎赉特旗地区晚石炭世早期闪长岩和石英闪长岩主量、微量和稀土元素分析结果

Table 2. Analysis result of major, trace elements and REE of early Late carboniferous diorite and quartz diorite in the Jalaid Banner area

样号	岩性	Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	K₂O	CaO	TiO₂	MnO	Fe₂O₃	FeO	烧失量	总计	Na₂O/K₂O
G17001b2-1	高镁闪长岩	4.20	6.28	16.6	53.17	0.35	1.61	5.08	1.09	0.20	3.56	5.12	2.54	99.8	2.61
G17001b2-3	高镁闪长岩	4.18	6.42	16.6	51.51	0.38	1.58	6.33	1.15	0.19	4.36	4.58	2.40	99.68	2.64
G17001b2-5	高镁闪长岩	4.48	5.80	16.57	53.43	0.38	1.52	5.11	1.26	0.18	4.17	4.74	2.34	99.97	2.94
G17006b3-1	石英闪长岩	5.76	0.87	15.74	67.94	0.15	2.14	2.52	0.37	0.07	1.54	1.71	0.73	99.53	2.70
G17006b3-2	石英闪长岩	5.54	1.13	15.24	68.83	0.14	1.95	2.28	0.36	0.07	1.41	1.98	0.73	99.66	2.84
G17006b3-3	石英闪长岩	5.48	0.92	15.9	67.66	0.14	2.39	2.77	0.36	0.07	1.58	1.62	0.84	99.74	2.29
G17006b3-4	石英闪长岩	4.76	1.06	16.39	63.27	0.17	1.78	6.73	0.51	0.17	2.34	2.34	0.65	100.1	2.68
G17006b3-5	石英闪长岩	5.71	1.02	15.26	68.81	0.14	2.00	2.35	0.38	0.08	1.64	1.77	0.77	99.94	2.85
样号	A/CNK	TFeO	Mg^#	DI	SI	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
G17001b2-1	0.93	8.33	0.57	46.97	30.29	22.2	50.9	6.95	29.3	6.43	2.09	5.17	0.81	5.32	0.95
G17001b2-3	0.83	8.50	0.57	45.99	30.57	23.7	53.3	6.95	27.5	5.48	1.89	4.41	0.69	4.38	0.78
G17001b2-5	0.91	8.49	0.55	48.74	28.14	25.9	53.8	7.90	30.0	6.12	2.24	5.21	0.82	5.44	0.99
G17006b3-1	0.96	3.09	0.33	81.59	7.21	36.4	65.2	6.94	23.3	3.19	1.28	2.56	0.27	1.32	0.21
G17006b3-2	0.99	3.25	0.38	81.1	9.38	38.9	69.8	7.44	24.9	3.31	1.25	2.63	0.29	1.31	0.20
G17006b3-3	0.96	3.04	0.35	80.4	7.72	38.1	69.0	7.28	24.5	3.27	1.36	2.63	0.27	1.25	0.19
G17006b3-4	0.75	4.44	0.30	65.91	8.64	39.5	73.2	8.00	27.8	4.02	1.24	3.29	0.37	1.90	0.33
G17006b3-5	0.96	3.25	0.36	81.8	8.38	38.8	69.9	7.09	23.8	3.08	1.23	2.76	0.26	1.31	0.20
样号	Er	Tm	Yb	Lu	Y	Co	Ni	Hf	Ta	Th	U	Ba	Cr	Ga	Nb
G17001b2-1	2.78	0.38	2.71	0.33	26.1	32.9	78.5	0.51	0.43	2.92	0.37	1800	85.2	16.1	10.1
G17001b2-3	2.38	0.34	2.49	0.30	22.5	33.9	73.3	0.60	0.42	1.24	0.33	1600	86.1	17.2	10.6
G17001b2-5	2.89	0.37	2.79	0.34	26.3	33.0	68.4	0.45	0.43	2.30	0.48	2400	90.7	15.3	11.0
G17006b3-1	0.61	0.07	0.54	0.06	6.13	6.35	2.23	0.30	0.31	4.12	0.23	1300	5.10	15.1	6.13
G17006b3-2	0.56	0.06	0.51	0.054	5.75	7.42	2.72	0.20	0.26	3.59	0.21	1300	3.10	13.2	6.15
G17006b3-3	0.53	0.06	0.45	0.053	5.44	6.57	2.54	0.19	0.23	3.37	0.22	1400	5.60	15.5	5.70
G17006b3-4	0.93	0.11	0.87	0.094	9.13	9.53	6.45	0.42	0.29	4.25	0.48	1000	9.50	23.5	7.22
G17006b3-5	0.53	0.06	0.49	0.054	5.41	6.57	4.54	0.20	0.33	3.24	0.16	1100	4.65	14.0	6.20
样号	Rb	Sr	V	Zr	ΣREE		LREE		HREE		LREE/ HREE	（La/ Yb）_N	δEu	δCe	Nb_N/ Zr_N
G17001b2-1	50.8	615	90.4	216	136.18		117.73		18.45		6.38	5.86	1.07	1.00	0.73
G17001b2-3	49.9	642	104	162	134.57		118.81		15.76		7.54	6.80	1.14	1.01	1.03
G17001b2-5	47.8	566	101	239	144.78		125.93		18.85		6.68	6.65	1.18	0.92	0.72
G17006b3-1	57.8	449	25.8	256	141.91		136.26		5.65		24.13	48.74	1.32	0.94	0.38
G17006b3-2	58.9	387	25.6	253	151.23		145.62		5.61		25.96	54.93	1.26	0.94	0.38
G17006b3-3	62.4	494	26.3	244	149.04		143.61		5.43		26.43	60.93	1.37	0.95	0.37
G17006b3-4	47.5	670	54.2	228	161.60		153.70		7.90		19.47	32.74	1.01	0.95	0.50
G17006b3-5	60.1	392	26.2	257	149.51		143.85		5.67		25.38	57.26	1.27	0.96	0.38
注：主量元素含量单位为%，微量和稀土元素含量单位为10⁶。Mg^#=(MgO/40.31)/(MgO/40.31+TFeO/71.85)；SI=100×MgO/（MgO+FeO+Fe₂O₃+Na₂O+K₂O)；DI=Q₂z+Or+Ab+Ne+Lc+Kp

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