辽东半岛隆昌地区~2 113 Ma变辉长岩地球化学与Hf同位素研究:对胶辽吉造山带构造演化的制约

赵岩; 寇林林; 张朋; 毕中伟; 李东涛; 陈聪

doi:10.3799/dqkx.2019.185

辽东半岛隆昌地区~2 113 Ma变辉长岩地球化学与Hf同位素研究:对胶辽吉造山带构造演化的制约

doi: 10.3799/dqkx.2019.185

赵岩^1,2,,
寇林林^1,2,
张朋^1,2,
毕中伟^1,2,
李东涛^1,2,
陈聪^1,2

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 DD20190042-03

国家重点研发计划项目 2016YFC0600108

中国地质调查局项目 DD20190156

国家重点研发计划项目 2018YFC0603804

详细信息

作者简介:
赵岩(1985—), 男, 工程师, 主要从事辽东地区造山作用与成矿

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2019-07-29
- 刊出日期: 2019-11-11

Characteristics of Geochemistry and Hf Isotope from Meta-Gabbro in Longchang Area, Liaodong Peninsula: Implications on Evolution of the Jiao-Liao-Ji Paleoproterozoic Orogenic Belt

Zhao Yan^{1,2
,},
Kou Linlin^1,2,
Zhang Peng^1,2,
Bi Zhongwei^1,2,
Li Dongtao^1,2,
Chen Cong^1,2

1.
Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China
2.
Northeast China Center for Geoscience and Innovation, Shenyang 110034, China

摘要

摘要: 辉长岩的成岩时代、成因等研究对限定胶辽吉造山带构造背景等关键问题具有重要意义.对其开展详细的岩石地球化学分析、全岩Nd同位素和锆石U-Pb测年及原位Hf同位素分析，结果显示样品受蚀变影响不大，TiO₂含量较低（< 1.31%），FeO^T（11.91%~14.25%）、MgO（6.88%~7.62%）含量不高，K₂O含量中等偏高（0.85%~1.23%），属钙碱性-高钾钙碱性岩浆系列，岩石轻重稀土分馏不明显，富集Rb、Ba、K等大离子亲石元素，亏损高场强元素P、Hf等，岩石相对富集Nd同位素，ε_Nd（t）值介于-1.6~2.6，（¹⁷⁶Hf/¹⁷⁷Hf）_i比值变化于0.281 497~0.281 612之间，ε_Hf（t）值变化于2.2~6.3之间，模式年龄t_DM1（Hf）值介于2.25~2.33 Ga.多种特征元素地球化学图解显示辉长岩具有E-MORB特征，与裂谷构造环境中产出的MORB和OIB不同.研究认为胶辽吉造山带在~2.1 Ga已存在洋壳俯冲，并可能已存在古岛弧，造山带演化过程中存在弧陆碰撞.
- 华北克拉通 /
- 胶辽吉造山带 /
- 隆昌地区 /
- 古元古代 /
- 变质辉长岩 /
- 地球化学
Abstract: The meta-gabbro, distributed in the Longchang area, eastern part of the North China craton, yields a zircon U-Pb age of 2 113±15 Ma by LA-ICP-MS. Detailed geochemistry analyses, whole rock Nd isotope and zircon U-Pb and in-situ Hf isotope analyses were made to confine tectonic settings of the Jiao-Liao-Ji orogenic belt and other crucial problems. The gabbro samples studied show calc-alkaline to high potassic alkaline series features with weak alteration and also low content of TiO₂(< 1.31%), moderate content of MgO (6.88%-7.62%), FeO^T(11.91%-14.25%) and K₂O (0.85%-1.23%). The studied samples are characterized with low REE content and show weak REE fractionation and depletion in high field strength elements like P and Hf. The samples also show enrichment in large ion lithophile elements like Rb, Ba and K, and enrichment in Nd isotope content, with ε_Nd(t) values of -1.6 to 2.6. (¹⁷⁶Hf/¹⁷⁷Hf)_i of zircon from the meta-gabbro samples ranging from 0.281 497 to 0.281 612, and the calculated ε_Hf(t) values ranging from 2.2 to 6.3. The calculated Hf modal ages are 2.25 to 2.33 Ga. Several crucial diagrams from meta-gabbro sample analysis results show far distance from MORB or OIB both of which are typical basalts distributed in a rift geological setting. E-MORB with continental crust component mixed in may be the exact origin of the meta-basalts in the Longchang area. It can be concluded that there was ocean crust subduction in~2.1 Ga within the Jiao-Liao-Ji orogenic belt, with possible paleo-arc and the evolution model of the Jiao-Liao-Ji orogenic belt is more like an arc-continental collision model.
- North China craton /
- Jiao-Liao-Ji orogenic belt /
- Longchang area /
- Paleoproterozoic /
- meta-gabbro /
- geochemistry

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图 1 胶辽吉造山带构造简图（a）和隆昌地区辉长岩地质简图（b）

Fig. 1. Geotectonic framwork of the Jiao-Liao-Ji orogenic belt (a) and simplified geological map of the gabbro in Longchang area, Liaodong peninsula(b)

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图 2 隆昌地区辉长岩野外照片（a, b）和镜下显微照片（单偏光）(c)（正交偏光）(d)

Pl.斜长石；Ep.绿帘石；Act.阳起石

Fig. 2. Fieldwork pictures (a, b) and microphotographs (c, d) of the gabbro in Longchang area, Liaodong peninsula

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图 3 隆昌地区辉长岩Zr/TiO₂-Nb/Y图解(a)和FeO^T/MgO-SiO₂分类图解(b)

图a据Winchester and Floyd(1977); 图b据Miyashiro(1974)

Fig. 3. Zr/TiO₂ vs. Nb/Y (a) and FeO^T/MgO vs. SiO₂ (b) diagrams for the gabbro samples from the Longchang area

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图 4 隆昌地区辉长岩样品典型锆石CL图和U-Pb测年结果

Fig. 4. Cathodoluminescence(CL) dqkx-44-10-3333s for zircon grains of gabbro sample showing sites of U-Pb analyses (a) and results(b) from the Longchang area

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图 5 隆昌地区辉长岩稀土元素配分曲线(a)和微量元素蛛网图(b)

OIB, E-MORB, N-MORB及标准化数据来自Sun and McDonough(1989)

Fig. 5. Chondrite-normalized REE patterns(a) and primitive mantle-normalized trace element patterns (b) for gabbro samples from the Longchang area

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图 6 隆昌地区辉长岩Ti-Sm-V三角图解(a)和Th/Yb-Nb/Yb判别图解(b)

Fig. 6. Ti-Sm-V (a) and Th/Yb-Nb/Yb (b) discrimination plots for the gabbro samples from the Longchang area

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图 7 隆昌地区辉长岩ε_Nd(t)-(La/Sm)_N (a)和ε_Nd(t)-t (b)图解

Fig. 7. Plots of ε_Nd(t) vs. (La/Sm)_N (a) and ε_Nd(t) vs. t (b) for the gabbro samples from the Longchang area

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图 8 隆昌地区辉长岩锆石Hf同位素组成(a)与ε_Nd(t)-ε_Hf(t)(b)图解

图a据Griffin et al.(2002);图b据 Vervoort et al.(1999)

Fig. 8. Hf isotopic compositions of zircons(a) and ε_Nd(t) vs. ε_Hf(t) diagram(b) for the gabbro samples from the Longchang area

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表 1 隆昌地区辉长岩锆石U-Pb测年数据

Table 1. In-situ zircon U-Pb isotopic dating for gabbro in the Longchang area, Liaodong peninsula

测试点	含量(10^-6)		Th/U	同位素比值				同位素年龄(Ma)
测试点	Th	U	Th/U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
LC-1	110	351	0.31	6.338 6	0.152 6	0.369 0	0.004 2	2 025	19.6	2 024	21.2	2 010	41.5
LC-2	161	196	0.82	6.894 9	0.128 9	0.378 9	0.002 9	2 071	13.5	2 098	16.6	2 118	31.6
LC-3	1 046	892	1.17	5.1142	0.081 4	0.299 9	0.002 4	1 691	11.9	1 838	13.6	2 003	27.9
LC-4	283	346	0.82	7.486 1	0.127 6	0.406 6	0.0040	2 199	18.6	2 171	15.3	2 139	21.1
LC-5	327	303	1.08	7.377 5	0.125 3	0.402 4	0.003 5	2 180	16.1	2 158	15.3	2 131	28.1
LC-6	174	273	0.64	6.986 1	0.133 6	0.378 7	0.003 1	2 070	14.7	2 110	17.0	2 140	31.3
LC-7	367	280	1.31	6.351 3	0.1144	0.349 9	0.002 7	1 934	12.8	2 026	15.9	2 122	31.2
LC-8	201	241	0.83	7.347 2	0.131 0	0.393 1	0.003 1	2 137	14.5	2 155	16.0	2 162	29.9
LC-9	128	165	0.78	7.294 1	0.1404	0.388 4	0.003 4	2 115	15.7	2 148	17.2	2 172	33.3
LC-10	147	172	0.86	7.563 6	0.159 9	0.397 8	0.003 7	2 159	17.2	2 181	19.0	2 192	37.0
LC-11	303	332	0.91	7.548 7	0.168 4	0.398 5	0.003 5	2 162	16.4	2 179	20.1	2 184	40.4
LC-12	202	264	0.77	7.475 1	0.197 9	0.396 7	0.0046	2 154	21.2	2 170	23.8	2 176	52.6
LC-13	585	702	0.83	5.231 3	0.122 6	0.296 3	0.002 6	1 673	12.9	1 858	20.0	2 057	42.6
LC-14	284	339	0.84	7.327 5	0.185 1	0.393 2	0.003 9	2 138	18.1	2 152	22.6	2 150	42.4
LC-15	299	313	0.95	7.485 4	0.148 6	0.396 6	0.003 9	2 153	17.8	2 171	17.8	2 173	33.6
LC-16	184	232	0.79	7.383 9	0.138 3	0.396 0	0.003 6	2 151	16.8	2 159	16.8	2 154	31.6
LC-17	134	206	0.65	7.267 1	0.137 2	0.392 7	0.003 7	2 136	17.1	2 145	16.9	2 139	32.1
LC-18	168	215	0.78	7.1447	0.136 9	0.387 9	0.003 7	2 113	17.1	2 130	17.1	2 131	33.5
LC-19	190	251	0.76	7.334 0	0.141 4	0.405 0	0.0045	2 192	20.7	2 153	17.3	2 103	33.6
LC-20	33	65	0.51	7.918 5	0.169 0	0.435 4	0.005 2	2 330	23.2	2 222	19.3	2 115	37.3
LC-21	371	369	1.00	7.109 9	0.112 4	0.392 2	0.003 3	2 133	15.1	2 125	14.2	2 106	27.2
LC-22	209	244	0.86	7.139 1	0.121 9	0.394 5	0.003 7	2 144	16.9	2 129	15.3	2 102	28.9
LC-23	223	265	0.84	7.776 3	0.149 7	0.424 3	0.005 5	2 280	24.7	2 205	17.4	2 128	28.7
LC-24	197	250	0.79	7.003 6	0.129 6	0.391 0	0.003 5	2 127	16.4	2 112	16.5	2 088	32.7
LC-25	137	238	0.58	6.643 7	0.125 3	0.374 5	0.003 1	2 051	14.5	2 065	16.7	2 069	32.7
LC-26	359	382	0.94	7.181 6	0.123 2	0.396 5	0.003 6	2 153	16.8	2 134	15.4	2 105	27.8
LC-27	106	146	0.72	7.371 8	0.135 9	0.408 9	0.0040	2 210	18.5	2 158	16.5	2 098	25.0
LC-28	548	444	1.24	7.045 8	0.113 0	0.389 2	0.002 9	2 119	13.5	2 117	14.3	2 103	27.6
LC-29	293	337	0.87	7.198 9	0.1341	0.397 4	0.0045	2 157	20.6	2 136	16.7	2 106	29.3
LC-30	1 368	753	1.82	6.495 6	0.138 3	0.358 2	0.0047	1 974	22.3	2 045	18.8	2 106	32.4
LC-31	270	329	0.82	7.432 8	0.145 4	0.409 9	0.0040	2 214	18.4	2 165	17.6	2 109	32.3
LC-32	159	179	0.89	7.417 7	0.135 3	0.408 0	0.003 9	2 206	18.1	2 163	16.4	2 117	31.3
LC-33	326	357	0.91	6.551 3	0.102 7	0.375 8	0.003 3	2 056	15.6	2 053	13.9	2 043	26.8
LC-34	268	278	0.96	7.245 2	0.123 3	0.400 1	0.003 9	2 170	17.9	2 142	15.3	2 109	27.5
LC-35	185	208	0.89	7.197 5	0.122 9	0.397 6	0.003 6	2 158	16.5	2 136	15.3	2 109	27.8
LC-36	262	288	0.91	7.283 1	0.1343	0.409 3	0.0043	2 212	19.6	2 147	16.5	2 079	29.5
LC-37	267	290	0.92	7.071 4	0.1306	0.401 0	0.003 9	2 174	18.0	2 120	16.5	2 062	30.6
LC-38	43	101	0.42	7.298 3	0.138 4	0.406 5	0.0040	2 199	18.2	2 149	17.0	2 094	31.2
LC-39	983	530	1.86	5.033 4	0.099 6	0.303 4	0.0041	1 708	20.5	1 825	16.8	1 950	25.9
LC-40	377	395	0.95	6.987 5	0.107 6	0.397 8	0.003 3	2 159	15.4	2 110	13.8	2 054	25.9

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表 2 隆昌地区辉长岩主微量元素数据（主量元素的单位为%, 微量元素的单位为10^-6）

Table 2. Whole rock chemical compositions of gabbro samples in the Longchang area, Liaodong peninsula

样号	LC-1	LC-2	LC-3	LC-4	LC-5
SiO2	46.67	45.83	48.42	46.72	47.65
TiO2	1.09	1.30	1.24	1.22	1.31
AI2O3	13.75	14.00	13.80	13.31	14.71
Fe₂O₃	4.29	3.28	3.85	4.18	4.03
FeO	8.63	10.29	9.21	9.57	7.87
MnO	0.17	0.20	0.19	0.21	0.15
MgO	7.62	7.32	7.36	7.37	6.88
CaO	8.79	7.50	8.68	9.35	8.83
Na₂O	2.62	1.77	2.98	2.35	3.52
K₂O	1.23	1.10	0.85	1.08	1.13
P₂O₅	0.083	0.130	0.130	0.120	0.088
LOI	5.00	7.05	3.65	4.66	3.54
SUM	99.94	99.76	100.36	100.12	99.70
Hf	0.37	0.38	0.45	0.36	0.49
Ta	0.25	0.70	0.55	0.86	0.75
Li	16.4	29.2	15.4	16.7	13.5
Be	0.50	0.48	0.63	0.55	1.44
Sc	41.6	42.3	42.3	43.3	59.7
Ni	51.6	47.5	50.4	53.7	31.3
Cs	0.83	0.75	0.53	0.37	0.79
Th	1.50	1.03	0.98	1.02	0.67
U	0.22	0.24	0.26	0.23	0.29
Ba	231	204	130	255	165
Pb	3.14	3.27	3.33	4.15	6.32
Nb	5.72	7.54	7.44	7.86	9.29
Rb	59.4	53.4	42.5	38.4	55.6
Sr	150	121	132	168	159
Zr	55.6	91.4	91.0	89.7	97.1
La	5.45	7.89	7.62	7.93	8.20
Ce	12.8	18.9	18.0	18.8	16.9
Pr	1.77	2.62	2.48	2.55	2.55
Nd	8.73	12.80	12.20	12.50	12.50
Sm	2.32	3.28	3.16	3.26	3.52
Eu	0.80	0.97	0.93	0.99	0.99
Gd	2.45	3.50	3.40	3.51	4.26
Tb	0.47	0.66	0.66	0.65	0.78
Dy	3.08	4.29	4.19	4.25	5.42
Ho	0.65	0.88	0.88	0.89	1.07
Er	1.85	2.49	2.44	2.49	3.04
Tm	0.30	0.39	0.40	0.40	0.49
Yb	2.07	2.71	2.72	2.74	3.20
Lu	0.29	0.37	0.38	0.38	0.39
Y	16.5	22.9	22.7	22.9	28.3
EREE	43.01	61.76	59.45	61.35	63.35
LREE	31.85	46.45	44.39	46.04	44.70
HREE	11.16	15.3	15.06	15.31	18.66
(La/Yb)_N	1.88	2.08	2.01	2.08	1.84
δEu	1.02	0.87	0.86	0.89	0.78

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表 3 隆昌地区辉长岩锆石原位Hf同位素组成

Table 3. In-situ zircon Hf isotopic data for gabbro in the Longchang area, Liaodong peninsula

点号	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	S_Hf(t)	t_DM1	t_DM2
LCZ-1	0.098 214	0.002 597	0.281 660	0.000 020	0.281 556	4.2	2 327	2 440
LCZ-2	0.083 844	0.002 226	0.281 651	0.000018	0.281 562	4.5	2 317	2 427
LCZ-3	0.155 910	0.003 544	0.281 728	0.000019	0.281 585	5.3	2 290	2 376
LCZ-4	0.122 781	0.003 332	0.281 686	0.000018	0.281 552	4.1	2 337	2 449
LCZ-5	0.141 439	0.003 430	0.281 703	0.000022	0.281 565	4.6	2 318	2 419
LCZ-6	0.104 470	0.003 238	0.281 741	0.000037	0.281 610	6.2	2 251	2 321
LCZ-7	0.079 143	0.002 104	0.281 671	0.000020	0.281 586	5.3	2 281	2 374
LCZ-8	0.085 358	0.002 076	0.281 684	0.000015	0.281 601	5.8	2 261	2 342
LCZ-9	0.102 462	0.002 562	0.281 673	0.000020	0.281 570	4.7	2 307	2 410
LCZ-10	0.077 420	0.001 973	0.281 683	0.000016	0.281 603	5.9	2 256	2 336
LCZ-11	0.140 272	0.003 607	0.281 757	0.000019	0.281 612	6.3	2 250	2 316
LCZ-12	0.100 750	0.002 549	0.281 700	0.000019	0.281 597	5.7	2 267	2 349
LCZ-13	0.105 547	0.003 020	0.281 619	0.000017	0.281 497	2.2	2 414	2 568
LCZ-14	0.182 231	0.005 223	0.281 803	0.000020	0.281 593	5.6	2 287	2 360
LCZ-15	0.154 204	0.003 991	0.281 728	0.000016	0.281 567	4.7	2 319	2 416
注：所有点号的年龄都取2 113 Ma计算Hf同位素值.

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表 4 隆昌地区辉长岩Nd同位素组成

Table 4. Whole rock Nd isotopic compositions for gabbro in the Longchang area, Liaodong peninsula

点号	Sm	Nd	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	2σ	ε_Nd	T_DM1(Ma)	T_DM2^(Ma)
LC-1	2.32	8.73	0.160 56	0.509 909	0.000009	0.2	2 873	2 536
LC-2	3.28	12.8	0.154 39	0.510032	0.000011	2.6	2 482	2 342
LC-3	3.16	12.2	0.156 62	0.509 981	0.000010	1.6	2 631	2 423
LC-4	3.26	12.5	0.157 28	0.509 863	0.000015	－0.7	2 949	2 607
LC-5	3.52	12.5	0.17008	0.509 819	0.000006	－1.6	3 346	2 677
注：所有点号的年龄都取2 113 Ma计算Hf同位素值.

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参考文献(59)

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