吉林南部通化地区集安群的年代学

秦亚; 陈丹丹; 梁一鸿; 邹存铭; 张青伟; 白令安

doi:10.3799/dqkx.2014.141

吉林南部通化地区集安群的年代学

doi: 10.3799/dqkx.2014.141

1.
桂林理工大学广西隐伏金属矿产勘查重点实验室, 广西桂林 541004
2.
南京地质矿产研究所, 江苏南京 210016
3.
吉林大学地球科学学院, 吉林长春 130061

基金项目:

中国地质调查局项目 1212011120329

详细信息

作者简介:
秦亚(1986-), 男, 博士, 主要从事区域构造演化研究.E-mail: 331417106@qq.com

通讯作者:
梁一鸿, E-mail: liangyih@jlu.edu.cn

中图分类号: P588.11
计量
- 文章访问数: 3271
- HTML全文浏览量: 165
- PDF下载量: 296
- 被引次数: 0
出版历程
- 收稿日期: 2013-12-12
- 刊出日期: 2014-11-01

Geochronology of Ji'an Group in Tonghua Area, Southern Jilin Province

1.
Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, China
2.
Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China
3.
College of Earth Sciences, Jilin University, Changchun 130061, China

摘要

摘要: 对辽吉裂谷带吉林段集安群火山岩和碎屑沉积岩以及裂谷带内的花岗岩进行了LA-ICP-MS锆石U-Pb的年代学研究.测年结果显示, 集安群火山岩形成于2156~2189Ma, 并于1870~1 881Ma接受区域变质作用改造.伴随集安群的火山-沉积和变质作用, 有2期花岗岩侵入: 一期形成于裂陷期的2156~2189Ma; 另一期形成于造山期的1870~1881Ma.同时, 碎屑锆石和捕获锆石获得了2471~2494Ma和2633~2653Ma的岩浆成因锆石年龄, 代表结晶基底的2次岩浆事件.集安群的物质来源于太古宙基底和裂陷期的岩浆事件产物.
- 通化地区 /
- 集安群 /
- 年代学 /
- 锆石 /
- LA-ICP-MS定年
Abstract: The chronology of volcanic and sedimentary rocks of Ji'an Group, and the granites of the Tonghua area of the Liaoji rift zone by the LA-ICP-MS zircon U-Pb dating are studied in the paper. The results show that the Ji'an Group formed in 2156 to 2189Ma, and subsequently underwent regional metamorphism between 1870 and 1881Ma.Accompanied by the volcanic-sedimentation and the metamorphism of the Ji'an Group, two periods of granitic intrusions occurred; one was at 2156 to 2189Ma during the rifting stage, whereas the other at 1870 to 1881Ma during the orogenic period. In addition, ages of magmatic zircons from the detrital zircons and the inherited zircons peaked at 2471 to 2494Ma and 2633 to 2653Ma, representing two magmatic events of the crystalline basement. Sedimentary provenance of the Ji'an Group was derived from the Archean basement and products of the magmatism during the rifting events.
- Tonghua area /
- Ji'an Group /
- geochronology /
- zircon /
- LA-ICP-MS dating

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图 1 通化地区地质简图

Fig. 1. Geological sketch map of Tonghua area

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图 2 蚂蚁河组斜长角闪岩(NMY01)野外照片(a)和显微照片(b)

Fig. 2. Field photo(a) and photomicrograph(b) of sample NMY01 illustrating minerals of amphibolite rocks of Mayihe Formation

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图 3 蚂蚁河组角闪斜长片麻岩(NMY02)野外照片(a)和显微照片(b)

Fig. 3. Field photo (a) and photomicrograph (b) of sample NMY02 illustrating minerals of amphibolite plagiogneiss of Mayihe Formation

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图 4 荒岔沟组斜长角闪岩(NH01)野外照片(a)和显微照片(b)

Fig. 4. Field photo(a) and photomicrograph(b) of sample NH01 illustrating minerals of amphibolite rocks of Huangchagou Formation

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图 5 大东岔组黑云变粒岩(ND02)野外照片(a)和显微照片(b)

Fig. 5. Field photo(a) and photomicrograph(b) of sample ND02 illustrating minerals of biotite granulite of Dadongcha Formation

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图 6 蚂蚁河组(NMY01)锆石阴极发光图像及年龄谐和图

Fig. 6. Zircon CL images and concordia diagrams of Mayihe Formation (NMY01)

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图 7 蚂蚁河组(NMY02)锆石阴极发光图像及U-Pb年龄谐和图

Fig. 7. Zircon CL images and concordia diagrams of Mayihe Formation (NMY02)

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图 8 荒岔沟组(NH01)锆石阴极发光图像及U-Pb年龄谐和图

Fig. 8. Zircon CL images and concordia diagrams of Huangchagou Formation (NH01)

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图 9 大东岔组(ND02)锆石阴极发光图像及U-Pb年龄谐和图

Fig. 9. Zircon CL images and concordia diagrams of Dadongcha Formation (ND02)

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图 10 钱桌岩体(NMY03)锆石阴极发光图像及U-Pb年龄谐和图

Fig. 10. Zircon CL images and concordia diagrams of Qianzhuo pluton (NMY03)

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图 11 钱桌岩体(NQZ01)锆石阴极发光图像及U-Pb年龄谐和图

Fig. 11. Zircon CL images and concordia diagrams of Qianzhuo pluton (NQZ01)

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图 12 双岔岩体(NSC01)锆石阴极发光图像及U-Pb年龄谐和图

Fig. 12. Zircon CL images and concordia diagrams of Shuangcha pluton (NSC01)

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表 1 LA-ICP-MS锆石U-Pb年龄数据

Table 1. The data of zircon U-Pb ages for LA-ICP-MS

样品NMY01	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品NMY01	Th(10^-6)	U(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
NMY0101	589	855	0.69	0.114 7	0.002 7	5.568 2	0.133 9	0.351 0	0.003 8	1 875	28	1 911	21	1 940	18
NMY0102	93	267	0.35	0.114 8	0.003 5	5.554 2	0.183 2	0.350 2	0.008 3	1 877	29	1 909	28	1 936	40
NMY0103	91	241	0.38	0.114 3	0.007 0	5.687 0	0.309 0	0.361 1	0.009 9	1 869	59	1 929	47	1 987	47
NMY0104	142	402	0.35	0.114 3	0.005 3	5.460 0	0.210 4	0.346 3	0.007 3	1 869	40	1 894	33	1 917	35
NMY0105	45	940	0.05	0.114 4	0.004 3	5.710 8	0.206 0	0.358 8	0.006 3	1 871	40	1 933	31	1 977	30
NMY0106	112	283	0.39	0.114 6	0.003 8	5.480 1	0.172 4	0.345 3	0.004 9	1 874	36	1 897	27	1 912	24
NMY0107	134	289	0.47	0.114 9	0.004 6	5.711 5	0.233 2	0.357 9	0.006 2	1 878	48	1 933	35	1 972	30
NMY0108	81	293	0.28	0.115 3	0.005 4	5.689 4	0.272 7	0.354 5	0.007 5	1 884	56	1 930	41	1 956	35
NMY0109	9 769	1 350	7.24	0.114 5	0.002 9	5.594 4	0.191 3	0.351 3	0.008 9	1872	29	1 915	29	1 941	43
NMY0110	1 180	1 320	0.89	0.114 4	0.003 6	5.560 0	0.226 1	0.354 8	0.015 7	1870	36	1 910	35	1 958	75
NMY0111	148	338	0.44	0.114	0.008 2	5.506 5	0.407 1	0.347 4	0.009 2	1 864	95	1 902	64	1 922	44
NMY0112	162	511	0.32	0.115	0.004 6	5.680 1	0.241 9	0.356 2	0.007 6	1 879	46	1 928	37	1 964	36
NMY0113	175	455	0.38	0.114 3	0.004 8	5.565 7	0.235 5	0.351 0	0.004 8	1 869	57	1 911	36	1 939	23
NMY0114	129	308	0.42	0.114 7	0.004 0	5.336 8	0.186 7	0.337 0	0.004 5	1 875	44	1 875	30	1 872	22
NMY0115	134	390	0.34	0.114 9	0.003 9	5.406 3	0.204 8	0.340 4	0.006 4	1 879	42	1 886	32	1 888	31
NMY0116	349	1137	0.31	0.114 3	0.006 3	5.262 4	0.211 4	0.335 7	0.013 1	1 868	33	1 863	34	1 866	63
NMY0117	387	951	0.41	0.115 1	0.002 1	5.362 1	0.131 0	0.336 7	0.006 9	1 881	20	1 879	21	1 871	33
NMY0118	122	289	0.42	0.114 7	0.004 3	5.617 0	0.216 4	0.354 8	0.005 3	1 875	48	1 919	33	1 957	25
NMY0119	146	330	0.44	0.115 1	0.004 3	5.636 5	0.219 7	0.354 0	0.006 2	1 881	45	1 922	34	1 954	29
样品NMY02	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品NMY02	Th(10^-6)	U(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
NMY0201	362	779	0.46	0.134 9	0.003 8	7.215 5	0.207 5	0.383 5	0.007 2	2 163	26	2 138	26	2 093	34
NMY0202	228	1 621	0.14	0.114 9	0.002 1	4.973 8	0.081 4	0.310 4	0.004 5	1 878	13	1 815	14	1 742	22
NMY0203	176	1 706	0.10	0.113 3	0.001 9	5.070 0	0.074 7	0.324 6	0.002 6	1 853	31	1 831	12	1 812	13
NMY0204	525	856	0.61	0.135 7	0.002 9	7.406 0	0.229 4	0.390 7	0.010 4	2 173	24	2 162	28	2 126	48
NMY0205	552	1 108	0.50	0.134 2	0.005 8	7.354 1	0.314 3	0.393 1	0.005 8	2 154	54	2 155	38	2 137	27
NMY0206	1282	939	1.37	0.115 5	0.003 5	5.162 7	0.149 9	0.321 7	0.005 8	1 887	28	1 846	25	1 798	28
NMY0207	333	934	0.36	0.135 8	0.003 1	7.439 6	0.190 2	0.393 4	0.005 4	2 174	26	2 166	23	2 139	25
NMY0208	294	1 764	0.17	0.113 9	0.002 4	5.113 6	0.111 2	0.323 2	0.003 5	1 862	24	1 838	18	1 805	17
NMY0209	355	587	0.60	0.135 3	0.004 6	7.505 5	0.258 4	0.399 1	0.005 4	2 168	41	2 174	31	2 165	25
NMY0210	356	651	0.55	0.135 4	0.004 5	7.517 1	0.238 7	0.400 5	0.006 7	2 169	32	2 175	28	2 171	31
NMY0211	2813	1 454	1.93	0.115 6	0.002 7	5.208 3	0.116 4	0.324 4	0.004 2	1 888	22	1 854	19	1 811	20
NMY0212	123	1 907	0.06	0.115 3	0.002 9	5.132 7	0.115 4	0.323 0	0.003 9	1 884	47	1 842	19	1 804	19
NMY0213	431	940	0.46	0.134 4	0.003 3	7.275 8	0.212 7	0.390 5	0.008 2	2 156	25	2 146	26	2 125	38
NMY0214	229	904	0.25	0.113 5	0.003 7	5.051 0	0.150 3	0.322 9	0.004 3	1 855	60	1 828	25	1 804	21
NMY0215	223	1 511	0.15	0.115 2	0.002 8	5.216 7	0.135 8	0.325 2	0.003 8	1 883	30	1 855	22	1 815	18
NMY0216	209	1 568	0.13	0.115 1	0.002 8	5.212 7	0.127 0	0.326 3	0.004 7	1 881	24	1 855	21	1 820	23
NMY0217	293	1 443	0.20	0.112 8	0.004 3	4.876 6	0.165 3	0.313 7	0.005 4	1 844	71	1 798	29	1 759	27
NMY0218	136	1 220	0.11	0.114 1	0.003 1	4.939 4	0.148 8	0.311 6	0.005 2	1 866	31	1 809	25	1 749	26
样品NH01	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品NH01	Th(10^-6)	U(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
NH0101	497	1 948	0.26	0.115 4	0.005 8	5.586 5	0.080 3	0.350 5	0.016 3	1 886	63	1 914	12	1 937	78
NH0102	336	849	0.40	0.161 5	0.003 7	10.540 0	0.251 0	0.470 1	0.005 4	2 471	25	2 483	22	2 484	23
NH0103	556	2 058	0.27	0.114 3	0.002 6	5.422 6	0.122 6	0.341 0	0.003 4	1 869	26	1 888	19	1 891	16
NH0104	449	2 624	0.17	0.114 6	0.003 1	5.475 7	0.134 0	0.343 0	0.004 3	1 874	26	1 897	21	1 901	21
NH0105	204	1 049	0.19	0.115 2	0.005 0	5.664 2	0.292 7	0.351 7	0.008 8	1 883	58	1 926	45	1 943	42
NH0106	132	217	0.61	0.115 0	0.004 8	5.335 2	0.207 4	0.332 7	0.007 3	1 880	40	1 875	33	1 851	35
NH0107	177	1 148	0.15	0.115 0	0.003 3	5.736 2	0.168 8	0.356 8	0.006 2	1 880	29	1 937	25	1 967	29
NH0108	483	2 180	0.22	0.115 1	0.007 2	5.414 9	0.166 0	0.338 3	0.018 4	1 882	55	1 887	26	1 878	89
NH0109	229	1 911	0.12	0.114 8	0.005 2	5.587 2	0.183 1	0.349 8	0.007 7	1 876	30	1 914	28	1 934	37
NH0110	172	1 413	0.12	0.114 8	0.004 1	5.331 4	0.175 1	0.333 1	0.005 7	1 876	35	1 874	28	1 853	28
NH0111	270	1 813	0.15	0.114 5	0.003 2	5.736 8	0.163 0	0.359 0	0.004 1	1 873	35	1 937	25	1 977	20
NH0112	201	1 234	0.16	0.114 7	0.002 7	5.503 6	0.127 0	0.344 8	0.003 8	1 876	26	1 901	20	1 910	18
NH0113	236	1 739	0.14	0.114 5	0.006 1	5.277 8	0.250 4	0.332 1	0.007 6	1 872	53	1 865	40	1 849	37
NH0114	264	1 805	0.15	0.115 5	0.002 8	5.411 3	0.127 4	0.337 4	0.003 4	1 887	28	1 887	20	1 874	16
NH0115	385	345	1.12	0.163 7	0.007 0	10.620 0	0.421 8	0.470 0	0.014 2	2 494	31	2 490	37	2 484	62
NH0116	342	1 793	0.19	0.115 2	0.004 2	5.428 9	0.206 1	0.339 0	0.005 8	1 883	44	1 889	33	1 882	28
NH0117	226	1 414	0.16	0.115 3	0.004 0	5.449 5	0.176 7	0.340 4	0.004 0	1 884	41	1 893	28	1 888	19
NH0118	233	1 293	0.18	0.116 0	0.003 1	5.652 0	0.149 3	0.351 0	0.004 1	1 895	31	1 924	23	1 939	19
NH0119	295	1 748	0.17	0.114 6	0.002 6	5.382 3	0.123 3	0.338 1	0.003 3	1 874	27	1 882	20	1 877	16
NH0120	379	1 658	0.23	0.115 1	0.002 7	5.391 7	0.122 3	0.337 5	0.003 2	1 881	27	1 884	19	1 875	15
样品ND02	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品ND02	Th(10^-6)	U(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
ND0201	632	803	0.79	0.163	0.003 5	10.331 9	0.240 2	0.456 2	0.006 3	2 486	21	2 465	22	2 423	28
ND0202	636	766	0.83	0.161 3	0.005 4	10.077 8	0.506 4	0.448 1	0.015 2	2 469	43	2 442	46	2 387	68
ND0203	337	802	0.42	0.160 8	0.010 1	9.927 2	0.576 2	0.443 8	0.006 6	2 464	78	2 428	54	2 368	29
ND0204	854	1 256	0.68	0.177 9	0.003 7	12.278 3	0.270 1	0.496 1	0.006 5	2 633	20	2 626	21	2 597	28
ND0205	712	1 342	0.53	0.160 7	0.004 0	10.143 0	0.249 8	0.453 4	0.005 9	2 463	24	2 448	23	2 410	26
ND0206	1 046	2 423	0.43	0.115 1	0.004 4	5.327 4	0.159 4	0.333 6	0.009 1	1 881	24	1 873	26	1 856	44
ND0207	368	442	0.83	0.161 9	0.005 9	10.251 4	0.462 7	0.454 2	0.009 2	2 475	49	2 458	42	2 414	41
ND0208	618	859	0.72	0.160 3	0.009 6	10.229 1	0.722 1	0.458 7	0.006 2	2 458	102	2 456	65	2 434	27
ND0209	435	1 121	0.39	0.136 9	0.004 4	7.144 1	0.241 0	0.375 8	0.005 9	2 189	37	2 130	30	2 056	28
ND0210	710	1 259	0.56	0.134 4	0.006 5	7.185 7	0.263 0	0.385 7	0.008 7	2 156	34	2 135	33	2 103	41
ND0211	585	1 461	0.40	0.160 1	0.002 9	10.015 2	0.429 2	0.450 6	0.017 5	2 457	32	2 436	40	2 398	78
ND0212	746	1 276	0.58	0.162 5	0.003 3	10.317 0	0.213 2	0.457 8	0.004 0	2 482	23	2 464	19	2 430	17
ND0213	824	1 473	0.56	0.161 3	0.004 2	10.404 7	0.260 7	0.465 9	0.006 4	2 470	24	2 471	23	2 465	28
ND0214	441	568	0.78	0.164 1	0.004 3	10.379 1	0.296 3	0.457 2	0.007 6	2 499	27	2 469	26	2 427	34
ND0215	507	457	1.11	0.180 1	0.005 0	12.398 2	0.369 5	0.497 1	0.008 6	2 653	27	2 635	28	2 602	37
ND0216	120	1 178	0.10	0.114 4	0.003 3	5.383 2	0.168 2	0.338 9	0.004 6	1 870	37	1 882	27	1 881	22
ND0217	362	202	1.79	0.162 6	0.003 4	10.197 0	0.250 5	0.452 2	0.006 8	2 482	35	2 453	23	2 405	30
ND0218	101.5	272	0.37	0.162 0	0.003 7	10.412 3	0.277 5	0.464 9	0.008 9	2 476	22	2 472	25	2 461	39
样品NMY03	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品NMY03	Th(10^-6)	U(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
NMY0301	870	1 838	0.47	0.135 5	0.004 4	7.434 4	0.202 7	0.396 5	0.005 4	2 171	29	2 165	24	2 153	25
NMY0302	624	1 258	0.5	0.135 8	0.003 8	7.326 3	0.203 4	0.388 9	0.007 6	2 174	24	2 152	25	2 118	35
NMY0303	593	543	1.09	0.135 0	0.004 8	7.404 1	0.292 2	0.394 5	0.007 3	2 164	43	2 161	35	2 144	34
NMY0304	466	769	0.61	0.134 4	0.003 5	7.417 7	0.195 2	0.397 1	0.005 5	2 157	27	2 163	24	2 156	25
NMY0305	267	537	0.5	0.135 7	0.004 7	7.591 5	0.313 4	0.400 7	0.008 4	2 173	43	2 184	37	2 172	39
NMY0306	1121	1 739	0.64	0.135 7	0.003 2	7.346 3	0.175 9	0.388 6	0.004 7	2 173	25	2 154	21	2 116	22
NMY0307	654	721	0.91	0.134 4	0.003 6	7.429 7	0.178 8	0.398 6	0.006 9	2 156	20	2 165	22	2 163	32
NMY0308	956	2 530	0.38	0.133 8	0.003 2	7.201 5	0.240 1	0.385 5	0.007 7	2 149	32	2 137	30	2 102	36
NMY0309	492	762	0.65	0.135 6	0.004 6	7.275 8	0.229 5	0.386 4	0.004 8	2 172	38	2 146	28	2 106	22
NMY0310	197	385	0.51	0.135 8	0.005 5	7.229 7	0.300 6	0.383 1	0.006 6	2 174	71	2 140	37	2 091	31
NMY0311	1641	2012	0.82	0.136 0	0.003 3	7.675 4	0.190 6	0.405 2	0.003 9	2 176	30	2 194	22	2 193	18
NMY0312	1025	1 651	0.62	0.135 9	0.003 9	7.719 7	0.338 5	0.405 5	0.010 3	2 176	42	2 199	39	2 194	47
NMY0313	230	493	0.47	0.135 3	0.003 8	7.428 5	0.209 2	0.396 2	0.007 2	2 168	25	2 164	25	2 152	33
NMY0314	596	977	0.61	0.136 0	0.004 6	7.606 9	0.218 8	0.402 5	0.007 6	2 177	25	2 186	26	2 180	35
NMY0315	217	434	0.5	0.135 4	0.005 4	7.458 6	0.326 3	0.394 2	0.005 1	2169	58	2 168	39	2 142	23
NMY0316	1234	2 162	0.57	0.135 5	0.003 2	7.205 6	0.170 9	0.381 8	0.005 0	2 171	24	2 137	21	2 085	23
NMY0317	762	1 094	0.70	0.135 1	0.005 1	7.386 3	0.332 4	0.392 2	0.007 6	2 165	51	2 159	40	2 133	35
NMY0318	658	1 430	0.46	0.135 8	0.003 9	7.245 9	0.200 6	0.383 7	0.004 0	2 174	34	2 142	25	2 093	19
样品NQZ01	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品NQZ01	Th(10^-6)	U(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
NQZ0101	400	667	0.60	0.134 4	0.003 0	7.320 6	0.162 4	0.392 1	0.003 4	2 156	26	2 151	20	2 132	16
NQZ0102	551	805	0.68	0.136 0	0.002 8	7.451 1	0.165 9	0.394 5	0.005 0	2 176	22	2 167	20	2 144	23
NQZ0103	270	520	0.52	0.135 2	0.003 1	7.532 2	0.176 8	0.401 6	0.004 7	2 167	25	2 177	21	2 176	22
NQZ0104	386	656	0.59	0.136 7	0.003 3	7.379 7	0.176 6	0.389 4	0.004 4	2 185	26	2 159	21	2 120	21
NQZ0105	294	559	0.53	0.135 1	0.003 3	7.594 1	0.189 6	0.404 9	0.004 5	2 165	28	2 184	22	2 192	21
NQZ0106	378	612	0.62	0.134 4	0.003 4	7.364 5	0.187 6	0.394 6	0.004 8	2 156	28	2 157	23	2 144	22
NQZ0107	397	707	0.56	0.135 5	0.003 3	7.383 1	0.109 4	0.391 6	0.008 9	2 171	20	2 159	13	2 130	41
NQZ0108	200	475	0.42	0.136 5	0.007 2	7.740 7	0.484 2	0.406 5	0.009 8	2 184	75	2 201	56	2 199	45
NQZ0109	392	671	0.58	0.134 8	0.006 4	7.764 7	0.399 7	0.413 3	0.008 9	2 161	60	2 204	46	2 230	41
NQZ0110	422	707	0.60	0.136 6	0.004 7	7.703 2	0.323 8	0.403 8	0.005 3	2 184	55	2 197	38	2 186	24
NQZ0111	894	1 097	0.81	0.134 9	0.006 9	7.473 9	0.391 9	0.396 9	0.005 0	2 163	74	2 170	47	2 155	23
NQZ0112	566	901	0.63	0.135 4	0.003 0	7.204 0	0.230 1	0.381 0	0.009 6	2 170	26	2 137	28	2 081	45
NQZ0113	416	711	0.59	0.135 4	0.001 5	7.637 2	0.109 8	0.403 9	0.003 1	2 170	15	2 189	13	2 187	14
NQZ0114	259	528	0.49	0.136 6	0.003 9	7.497 0	0.179 5	0.394 1	0.006 0	2 185	22	2 173	21	2 142	28
NQZ0115	556	848	0.66	0.135 4	0.003 1	7.644 6	0.172 2	0.405 9	0.006 0	2 168	20	2 190	20	2 196	28
NQZ0116	548	858	0.64	0.135 4	0.002 7	7.512 4	0.133 7	0.399 6	0.005 0	2 170	15	2 174	16	2 167	23
NQZ0117	541	800	0.68	0.135 2	0.003 1	7.537 5	0.249 2	0.400 9	0.008 2	2 166	31	2 177	30	2 173	38
NQZ0118	347	593	0.59	0.134 5	0.003 1	7.633 3	0.245 1	0.408 3	0.006 4	2 158	34	2 189	29	2 207	29
NQZ0119	518	801	0.65	0.135 7	0.002 8	7.617 6	0.158 8	0.405 6	0.004 2	2 173	22	2 187	19	2 195	19
样品NSC01	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品NSC01	Th(10^-6)	U(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
NSC0101	850	1 130	0.75	0.114 7	0.002 5	5.364 7	0.120 0	0.336 3	0.003 1	1 874	27	1 879	19	1 869	15
NSC0102	240	1 765	0.14	0.115 0	0.003 3	5.446 6	0.194 6	0.340 2	0.005 4	1 879	42	1 892	31	1 888	26
NSC0103	200	1 417	0.14	0.114 6	0.003 4	5.352 6	0.156 4	0.336 7	0.006 2	1 874	28	1 877	25	1 871	30
NSC0104	242	1 921	0.13	0.113 8	0.007 1	5.250 6	0.296 8	0.332 2	0.007 7	1 860	69	1 861	48	1 849	37
NSC0105	294	1 519	0.19	0.114 7	0.002 7	5.498 9	0.229 9	0.344 2	0.008 1	1 875	43	1 900	36	1 907	39
NSC0106	430	2 672	0.16	0.114 1	0.003 6	5.421 0	0.140 0	0.341 6	0.005 6	1 866	24	1 888	22	1 894	27
NSC0107	636	1 619	0.39	0.115 2	0.004 9	5.482 8	0.255 1	0.341 7	0.005 7	1 882	60	1 898	40	1 895	27
NSC0108	170	1 253	0.14	0.114 6	0.003 6	5.475 6	0.185 0	0.343 2	0.006 0	1 874	36	1 897	29	1 902	29
NSC0109	360	1 034	0.35	0.115 5	0.003 8	5.395 4	0.179 9	0.336 0	0.006 0	1 887	35	1 884	29	1 867	29
NSC0110	214	1 502	0.14	0.114 5	0.003 5	5.488 6	0.189 0	0.344 6	0.005 5	1 871	39	1 899	30	1 909	27
NSC0111	125	926	0.13	0.115 1	0.002 8	5.488 3	0.130 4	0.343 1	0.003 8	1 882	27	1 899	20	1 901	18
NSC0112	140	1 153	0.12	0.115 3	0.003 2	5.488 4	0.170 0	0.342 3	0.006 4	1 885	30	1 899	27	1 898	31
NSC0113	122	1 023	0.12	0.115 1	0.012 9	5.445 5	0.325 7	0.342 2	0.019 0	1 881	48	1 892	51	1 897	91
NSC0114	166	1 500	0.11	0.115 2	0.004 6	5.315 4	0.184 7	0.332 4	0.005 3	1 883	40	1 871	30	1 850	26
NSC0115	190	1 507	0.13	0.115 0	0.003 0	5.344 3	0.142 1	0.334 6	0.004 3	1 880	29	1 876	23	1 861	21
NSC0116	339	1 996	0.17	0.115 2	0.002 5	5.336 4	0.116 7	0.333 2	0.003 1	1 883	26	1 875	19	1 854	15
NSC0117	279	1 804	0.15	0.114 6	0.002 6	5.347 3	0.115 7	0.336 1	0.003 6	1 874	24	1 876	19	1 868	17

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表 2 锆石年龄分布

Table 2. Distribution of the zircon age

	蚂蚁河组		荒岔沟组	大东岔组	钱桌岩体		双岔岩体	地质意义
样品编号	NMY01	NMY02	NH01	ND02	NMY03	NQZ01	NSC01
岩性	斜长角闪岩	角闪斜长片麻岩	斜长角闪岩	黑云变粒岩	片麻状二长花岗岩		二长花岗岩
1 870~1 881 Ma	^*1 875± 17 Ma	^*1 876± 15 Ma	^*1 879± 15 Ma	^#1 870±37 Ma ^#1 881±24 Ma			^*1 877±15 Ma ^#1 874±27 Ma	区域变质作用年龄；花岗岩体侵位年龄
2 156~2 189 Ma		^*2 166± 22 Ma		^#2 189±37 Ma ^#2 156±34 Ma	^*2 168± 14 Ma	^*2 170± 11 Ma		裂谷带裂陷期火山岩年龄；花岗岩侵位年龄
2 471~2 494 Ma			^#2 471±25 Ma ^#2 494±31 Ma	^*2 477± 17 Ma				太古宙结晶基底岩浆事件年龄
2 633~2 653 Ma				^#2 633±20 Ma ^#2 653±27 Ma				太古宙结晶基底岩浆事件年龄
注：*为加权平均年龄；^#为单颗粒锆石年龄.

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