新特提斯洋早期俯冲的岩浆岩记录及其成矿——西藏日喀则西北部花岗岩类锆石U-Pb年龄及Hf同位素

付燕刚; 唐菊兴; 胡古月; 高一鸣; 林彬

新特提斯洋早期俯冲的岩浆岩记录及其成矿——西藏日喀则西北部花岗岩类锆石U-Pb年龄及Hf同位素

1.
中国地质科学院地球物理地球化学勘查研究所/国土资源部地球化学探测重点实验室, 河北廊坊 065000
2.
中国地质科学院矿产资源研究所/国土资源部成矿作用与资源评价重点实验室, 北京 100037

基金项目:

中国地质调查局项目《西藏雄村-普桑果斑岩-矽卡岩型铜多金属矿成矿地质背景与找矿潜力调查》 12120114068401

《内蒙古黑鹰山地区矿产地质调查》 DD20160040

详细信息

作者简介:
付燕刚(1988-), 男, 博士, 工程师, 资源勘查与评价专业。E-mail:fuyangang@igge.cn

通讯作者:
唐菊兴(1964-), 男, 博士, 研究员, 博士生导师, 从事西藏主要成矿带矿床学研究及矿床勘查评价工作。E-mail:tangjuxing@126.com

中图分类号: P588.1
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出版历程
- 收稿日期: 2017-02-19
- 修回日期: 2017-03-22
- 网络出版日期: 2023-08-15
- 刊出日期: 2018-05-31

The magma records and mineralization of early subduction of Neo-Tethyan oceanic slab: Zircon U-Pb and Hf isotopic composition of granitoids in the northwest of Xigaza

1.
Key Laboratory of Geochemical Exploration, Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, Hebei, China
2.
MRL Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China

摘要

摘要:
拉萨地体南缘的晚三叠世—中侏罗世岩浆岩被认为是新特提斯洋早期北向俯冲的岩浆记录，并形成与之相关的雄村特大型斑岩-浅成低温热液铜-金矿床。对该时期岩浆岩成因背景的研究有助于评价其成矿潜力。选取拉萨地体南缘日喀则西北部花岗岩类进行锆石U-Pb测年及Lu-Hf同位素分析。花岗岩类LA-ICP-MS锆石U-Pb定年结果为175～180.1Ma，ε_Hf（t）平均值为+13.4，显示幔源特征，为岛弧（洋内弧）背景成因，具有斑岩铜金成矿潜力。结合前人对拉萨地体南缘晚三叠世—白垩纪岩浆岩的研究，认为拉萨地体南缘未被剥蚀的晚三叠世—白垩纪火山岩中有可能保存有新特提斯洋俯冲形成的斑岩铜金成矿系统。
- 新特提斯洋 /
- 晚三叠世-中侏罗世岩浆岩 /
- 斑岩铜金矿 /
- 岛弧(洋内弧)
Abstract:
The Late Triassic-Middle Jurassic magmatic rocks distributed sporadically in the south of Lhasa terrane are considered to be the magmatic records of the early subduction of the Neo-Tethys. In addition, Xiongcun porphyry copper system was associated with the magma. Therefore, research on the Late Triassic-Jurassic magmatic can help to evaluate its metallogenic potential. This pa-per reports LA-ICP MS zircon U-Pb age and in situ Hf isotopic compositions of the granodiorite in the northwest of Xigaza. The obtained U-Pb zircon age of the granodiorite is 175～180.1Ma. Zircon Hf isotopic compositions of the granodiorite display ε_Hf(180.1Ma)=(+13.4), which shows the characteristics of mantle source with an affinity for island arc which was capable of forming the porphyry Cu-Au system. Therefore, the Late Triassic-Cretaceous volcanic rocks in the south of Lhasa terrane have the potential for exploration of the porphyry Cu-Au system.
- Neo-Tethys /
- Late Triassic-Middle Jurassic magmatic rocks /
- porphyry Cu-Au system /
- island-arc

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致谢: 资料收集阶段得到成都理工大学杨宗耀同学的大力帮助，实验过程中得到中国地质大学(北京)相鹏博士的悉心指导，在此深表感谢。

图 1 青藏高原、拉萨地体及研究区地质简图

a—青藏高原地质构造格架^[10]；b—拉萨地体南部岩浆岩分布简图^[11]；c—拉萨地体南缘晚三叠世-中侏罗世岩浆岩分布简图；d—样品采集位置(来自google earth卫星图)JSSZ—金沙江缝合带；BNSZ—班公湖-怒江缝合带；IYSZ—印度河-雅鲁藏布江缝合带

Figure 1. Sketch maps of the Tibetan Plateau, the Lhasa terrane and the study area

下载: 全尺寸图片幻灯片

图 2 侏罗纪花岗岩类岩石学特征

Pl—斜长石；Am—角闪石；Q—石英

Figure 2. Petrological features of Jurassic granitoids

下载: 全尺寸图片幻灯片

图 3 侏罗纪花岗岩类部分锆石阴极发光图像及U-Pb、Lu-Hf测点

Figure 3. Representative zircon CL images and analytical points of the zircons from the Jurassic granitoids

下载: 全尺寸图片幻灯片

图 4 侏罗纪花岗岩类锆石U-Pb年龄谐和图及相应的锆石稀土元素配分模式

Figure 4. U-Pb concordia diagrams and corresponding chondrite–normalized REE patterns of zircons from the Jurassic granitoids

下载: 全尺寸图片幻灯片

图 5 拉萨地体南缘晚三叠世—中侏罗世岩浆岩Sr-Nd-Hf同位素特征

Figure 5. Sr-Nd-Hf isotopic characteristics of the Late Triassic to Middle Jurassic magmatic rocks on the southern margin of Lhasa terrane

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表 1 侏罗纪花岗岩类的LA-ICP-MS锆石U-Th-Pb年龄分析结果

Table 1 LA-ICP-MS zircon U-Th-Pb dating results of the Jurassic granitoids

测点	Th/10^-6	U/10^-6	Th/U	同位素比值						年龄/Ma
测点	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
TD134-1	185	260	0.71	0.05048	0.0045	0.1899	0.0154	0.02744	0.0005	217	193	177	13.2	175	3.1
TD134-2	89.2	157	0.57	0.05150	0.0054	0.1974	0.0186	0.02791	0.0007	265	43.5	183	15.8	177	4.6
TD134-3	114	192	0.59	0.05185	0.0043	0.1953	0.0141	0.02804	0.0005	280	191	181	12.0	178	3.3
TD134-4	185	239	0.77	0.05118	0.0046	0.1892	0.0151	0.02780	0.0006	256	207	176	12.9	177	3.6
TD134-5	96.6	150	0.64	0.05160	0.0053	0.2031	0.0188	0.02887	0.0006	333	237	188	15.9	183	3.7
TD134-6	124	204	0.61	0.05097	0.0045	0.1918	0.0164	0.02788	0.0007	239	199	178	14.0	177	4.3
TD134-7	157	200	0.79	0.05143	0.0058	0.1908	0.0187	0.02741	0.0005	261	237	177	15.9	174	3.4
TD134-8	213	260	0.82	0.05597	0.0048	0.2040	0.0176	0.02768	0.0014	450	188	188	14.8	176	8.6
TD134-9	92.1	157	0.59	0.04925	0.0047	0.1931	0.0168	0.02862	0.0006	167	202	179	14.3	182	3.7
TD134-10	135	221	0.61	0.04986	0.0044	0.1821	0.0137	0.02689	0.0006	187	202	170	11.8	171	3.5
TD134-11	124	207	0.60	0.04969	0.0062	0.2033	0.0221	0.03024	0.0007	189	261	188	18.7	192	4.4
TD134-12	184	242	0.76	0.04916	0.0044	0.2036	0.0176	0.02956	0.0006	154	200	188	14.8	188	3.7
TD134-13	156	186	0.84	0.05484	0.0079	0.2034	0.0177	0.02999	0.0007	406	321	188	14.9	190	4.4
TD134-14	119	170	0.70	0.05112	0.0043	0.2034	0.0153	0.02947	0.0006	256	193	188	12.9	187	3.7
TD134-15	163	232	0.70	0.04823	0.0036	0.1953	0.0142	0.02880	0.0006	109	167	181	12.1	183	4.1
TD134-16	144	198	0.73	0.04860	0.0039	0.1917	0.0129	0.02864	0.0006	128	181	178	11.0	182	3.9
TD134-17	117	194	0.60	0.04707	0.0036	0.1983	0.0134	0.03033	0.0007	53.8	180	184	11.4	193	4.3
TD134-18	116	203	0.57	0.04992	0.0049	0.1892	0.0172	0.02774	0.0007	191	215	176	14.7	176	4.4
TD134-19	267	330	0.81	0.04920	0.0035	0.1944	0.0129	0.02827	0.0004	167	150	180	11.0	180	2.7
TD134-20	147	197	0.75	0.05087	0.0041	0.1935	0.0130	0.02813	0.0006	235	185	180	11.1	179	3.6
TD134-21	79.8	145	0.55	0.05025	0.0062	0.2107	0.0239	0.02975	0.0010	206	272	194	20.1	189	6.0
TD134-22	137	210	0.65	0.04833	0.0061	0.1846	0.0211	0.02783	0.0007	122	265	172	18.1	177	4.5
TD134-23	113	183	0.62	0.04968	0.0046	0.1965	0.0167	0.02873	0.0006	189	200	182	14.2	183	3.9
TD134-24	248	278	0.89	0.05256	0.0044	0.1954	0.0140	0.02741	0.0005	309	197	181	11.9	174	3.3
TD134-25	122	180	0.68	0.04750	0.0042	0.1863	0.0156	0.02738	0.0007	76.0	196	173	13.4	174	4.2
TD136-2	282	345	0.82	0.05098	0.0027	0.1947	0.0096	0.02800	0.0004	239	122	181	8.1	178	2.8
TD136-3	138	142	0.97	0.05285	0.0079	0.1988	0.0260	0.02817	0.0009	324	307	184	22.0	179	5.5
TD136-4	213	191	1.12	0.05250	0.0046	0.1961	0.0157	0.02760	0.0005	306	200	182	13.3	176	3.2
TD136-6	175	222	0.79	0.05111	0.0043	0.2104	0.0156	0.03068	0.0005	150	174	181	12.7	181	3.7
TD136-7	108	120	0.90	0.04904	0.0038	0.1946	0.0149	0.02851	0.0006	254	252	173	16.5	173	4.0
TD136-8	209	213	0.98	0.05132	0.0060	0.1863	0.0193	0.02720	0.0006	220	183	176	11.6	174	3.4
TD136-9	256	231	1.11	0.05056	0.0040	0.1897	0.0136	0.02729	0.0005	172	172	176	11.0	176	3.2
TD136-10	491	484	0.79	0.04952	0.0036	0.1897	0.0129	0.02767	0.0005	209	128	183	8.9	181	2.9
TD136-11	155	206	0.82	0.05029	0.0028	0.1977	0.0105	0.02854	0.0005	333	224	181	13.7	180	3.8
TD136-12	111	154	0.59	0.05167	0.0050	0.1946	0.0161	0.02835	0.0006	467	318	185	18.8	177	4.7
TD136-13	125	136	0.61	0.05472	0.0077	0.1993	0.0222	0.02791	0.0008	394	155	185	21.2	174	4.7
TD136-14	229	198	0.60	0.05457	0.0084	0.1994	0.0250	0.02744	0.0007	276	234	166	13.0	164	3.4
TD136-15	148	151	0.76	0.05181	0.0052	0.1777	0.0150	0.02584	0.0005	183	181	175	12.6	175	4.0
TD136-16	98.0	123	0.84	0.04975	0.0041	0.1881	0.0148	0.02758	0.0006	339	315	176	21.3	177	4.2
TD136-17	322	219	0.70	0.05327	0.0081	0.1892	0.0250	0.02788	0.0007	333	226	171	14.7	167	3.7
TD136-18	170	232	0.70	0.05163	0.0050	0.1831	0.0172	0.02625	0.0006	250	226	178	14.2	179	3.6
TD136-19	75.3	101	0.73	0.05121	0.0050	0.1913	0.0166	0.02808	0.0006	300	268	180	21.7	175	5.6
TD136-20	205	368	0.60	0.05217	0.0068	0.1945	0.0256	0.02758	0.0009	233	137	177	9.5	174	3.0
TD136-21	170	275	0.57	0.05061	0.0030	0.1902	0.0111	0.02731	0.0005	191	185	175	13.1	174	3.1
TD136-22	124	137	0.81	0.04991	0.0042	0.1886	0.0153	0.02736	0.0005	117	350	175	18.5	177	5.2
TD136-23	117	131	0.75	0.04837	0.0063	0.1880	0.0216	0.02777	0.0008	220	215	183	15.8	175	4.3
TD136-24	1584	1394	0.55	0.05059	0.0050	0.1973	0.0187	0.02746	0.0007	191	89.8	174	6.5	173	2.7
TD136-25	144	152	0.65	0.04987	0.0020	0.1869	0.0076	0.02714	0.0004	187	202	171	12.3	172	3.6

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表 2 侏罗纪花岗岩类锆石稀土元素分析结果

Table 2 REE analyses of zircon of the Jurassic granitoids

10^-6
样品号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	Th	U	Th/U
TD134-1	0.007	15	0.071	1.4	1.7	1.1	14.4	5.7	77	35	185	45	507	121	1143	185	260	0.71
TD134-2	0.010	10	0.029	0.2	1.7	0.9	9.9	3.8	52	23	129	33	376	92	803	89	157	0.57
TD134-3	1.552	15	0.392	0.8	1.5	0.5	6.9	3.0	42	21	111	28	312	78	670	114	192	0.59
TD134-4	0.008	14	0.019	1.0	1.1	0.6	10.9	4.5	61	27	146	37	410	99	905	185	239	0.77
TD134-5	0.020	9	0.058	1.3	2.2	1.0	11.4	4.3	55	25	126	31	348	83	783	97	150	0.64
TD134-6	0.021	12	0.033	0.4	1.3	0.7	7.6	3.1	45	21	114	28	317	78	676	124	204	0.61
TD134-7	0.013	11	0.096	2.0	3.1	1.7	18.0	6.1	78	33	162	40	426	99	1038	157	200	0.79
TD134-8	0.001	15	0.027	0.6	1.4	0.8	9.9	4.0	56	26	142	35	398	97	865	213	260	0.82
TD134-9	0.019	9	0.041	0.6	1.6	0.7	8.8	3.6	49	23	122	31	355	87	745	92	157	0.59
TD134-10	0.001	15	0.034	1.1	1.5	0.8	12.0	4.6	66	31	167	43	474	116	1021	135	221	0.61
TD134-11	0.001	12	0.049	0.7	1.5	0.8	9.2	3.6	51	24	128	32	361	89	774	124	207	0.60
TD134-12	0.045	15	0.091	1.8	3.1	1.5	17.4	6.5	85	37	190	45	494	118	1156	184	242	0.76
TD134-13	0.038	10	0.023	0.3	0.7	0.5	6.3	2.5	34	15	79	19	220	55	481	156	186	0.84
TD134-14	0.013	10	0.093	1.4	2.9	1.1	15.6	5.2	69	29	146	36	385	92	932	119	170	0.70
TD134-15	0.001	14	0.058	1.5	3.2	1.5	17.6	6.1	81	36	188	46	505	123	1167	163	232	0.70
TD134-16	0.001	11	0.024	0.6	0.9	0.5	5.9	2.4	34	16	81	20	226	55	495	144	198	0.73
TD134-17	0.013	12	0.020	0.3	1.4	0.9	10.2	3.7	51	24	131	33	368	91	785	117	194	0.60
TD134-18	0.089	11	0.065	0.7	1.2	0.5	7.6	3.0	44	21	112	28	321	80	679	116	203	0.57
TD134-19	0.020	21	0.068	0.8	1.8	0.8	14.6	5.6	80	37	198	49	544	132	1210	267	330	0.81
TD134-20	0.001	11	0.020	0.5	0.9	0.9	8.5	3.2	46	21	113	28	317	78	685	147	197	0.75
TD134-21	0.014	9	0.024	0.3	0.7	0.4	5.3	2.1	30	13	72	18	206	52	433	80	145	0.55
TD134-22	0.001	12	0.014	0.5	1.8	0.6	9.1	3.5	50	24	129	33	366	89	764	137	210	0.65
TD134-23	2.299	16	0.505	2.7	1.7	0.9	9.4	3.8	53	25	131	34	373	94	774	113	183	0.62
TD134-24	0.001	15	0.028	0.7	1.7	0.7	10.1	3.7	51	23	121	30	331	80	735	248	278	0.89
TD134-25	0.016	11	0.039	1.0	2.2	0.8	10.1	4.2	57	26	138	34	385	94	843	122	180	0.68
TD136-2	0.007	32	0.109	1.5	3.6	1.7	21.4	7.4	103	44	235	60	663	155	1445	282	345	0.82
TD136-3	0.080	18	0.283	4.8	5.8	3.9	34.5	10.6	125	50	244	55	583	131	1538	138	142	0.97
TD136-4	0.036	29	0.391	6.3	9.7	4.6	48.0	15.1	176	70	325	76	774	171	2139	213	191	1.12
TD136-6	0.009	27	0.057	1.3	2.2	1.4	16.9	6.9	100	45	239	58	618	143	1470	175	222	0.79
TD136-7	0.021	15	0.213	3.6	5.5	2.7	28.5	8.7	104	41	201	46	494	110	1286	108	120	0.90
TD136-8	0.013	28	0.127	2.4	5.0	2.6	30.2	10.5	137	58	290	68	717	161	1847	209	213	0.98
TD136-9	0.054	30	0.418	4.9	9.5	4.9	48.8	15.1	177	72	338	77	801	178	2186	256	231	1.11
TD136-10	0.001	59	0.040	1.3	3.2	1.7	21.8	9.3	131	59	314	77	836	192	1935	491	484	1.01
TD136-11	0.009	24	0.044	1.1	2.3	1.2	17.4	6.7	93	43	229	57	614	141	1415	155	206	0.75
TD136-12	0.014	19	0.096	1.2	2.5	1.2	14.9	5.7	81	36	188	46	504	115	1160	111	154	0.72
TD136-13	0.049	17	0.268	3.7	6.2	3.1	32.3	8.7	108	43	210	49	524	117	1349	125	136	0.92
TD136-14	0.023	30	0.532	6.6	10.8	5.0	51.3	15.8	187	72	349	79	819	180	2267	229	198	1.16
TD136-15	0.485	20	0.306	3.4	6.8	2.9	30.9	10.3	124	49	238	55	583	130	1544	148	151	0.98
TD136-16	0.013	15	0.145	2.6	3.9	1.8	19.9	6.4	78	32	165	39	430	100	1034	98	123	0.80
TD136-17	0.038	39	0.471	8.3	15.8	7.5	69.7	22.4	252	97	448	100	1036	220	2943	322	219	1.47
TD136-18	0.001	9	0.072	1.3	2.1	1.1	10.8	3.3	45	19	93	22	251	58	591	170	232	0.73
TD136-19	0.001	11	0.102	3.3	3.4	1.7	16.5	5.4	66	27	135	32	349	79	863	75	101	0.75
TD136-20	0.007	11	0.015	0.2	0.5	0.5	3.7	1.6	23	11	65	18	213	57	387	205	368	0.56
TD136-21	0.001	10	0.044	0.6	1.2	0.7	6.3	2.6	33	14	80	20	242	59	491	170	275	0.62
TD136-22	0.192	18	0.170	3.8	5.1	2.7	26.7	8.6	105	43	217	51	547	124	1378	124	137	0.90
TD136-23	0.080	17	0.216	3.1	6.7	3.0	27.1	9.0	106	43	211	50	528	118	1346	117	131	0.89
TD136-24	0.025	54	0.077	2.0	2.9	1.3	15.0	5.2	75	36	212	58	692	170	1259	1584	1394	1.14
TD136-25	0.070	20	0.247	3.7	6.5	3.3	31.4	10.4	121	49	239	55	584	130	1524	144	152	0.95

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表 3 侏罗纪花岗岩类的锆石Lu-Hf同位素数据

Table 3 Zircon Hf isotope data of the Jurassic granitoids

样品号	¹⁷⁶Hf/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Yb/¹⁷⁷Hf	年龄/Ma	ε_Hf(0)	ε_Hf(t)	T_DM1/Ma	2σ	f_Lu/Hf	T_DM2-1/Ma	2σ	T_DM2-2/Hf	2σ
TD134-1	0.283134	0.000019	0.001263	0.027206	180.1	12.8	16.6	167	54	-0.96	159	85	150	121
TD134-2	0.282997	0.000013	0.001362	0.029658	180.1	7.9	11.7	365	38	-0.96	471	60	594	85
TD134-3	0.283109	0.000012	0.001589	0.034189	180.1	11.9	15.7	204	35	-0.95	218	54	234	77
TD134-4	0.283010	0.000012	0.001106	0.023603	180.1	8.4	12.2	344	36	-0.97	439	57	548	80
TD134-5	0.282975	0.000014	0.001172	0.025073	180.1	7.2	11.0	394	39	-0.96	519	62	662	89
TD134-6	0.283027	0.000011	0.001029	0.022321	180.1	9.0	12.9	319	31	-0.97	400	50	493	70
TD134-7	0.283046	0.000014	0.001492	0.032106	180.1	9.7	13.5	295	41	-0.96	360	64	435	90
TD134-8	0.282980	0.000011	0.001521	0.032397	180.1	7.3	11.1	391	30	-0.95	511	48	650	68
TD134-9	0.283099	0.000011	0.001786	0.039349	180.1	11.6	15.3	220	33	-0.95	243	51	269	73
TD134-10	0.283037	0.000011	0.000974	0.021004	180.1	9.4	13.2	304	32	-0.97	377	51	459	72
TD134-11	0.282989	0.000013	0.001090	0.023435	180.1	7.7	11.5	374	38	-0.97	487	60	616	85
TD134-12	0.283058	0.000012	0.001589	0.034490	180.1	10.1	13.9	278	34	-0.95	333	53	398	75
TD134-13	0.282928	0.000012	0.001603	0.034201	180.1	5.5	9.3	467	35	-0.95	629	54	818	77
TD134-14	0.283048	0.000012	0.001336	0.028546	180.1	9.8	13.6	291	35	-0.96	354	55	428	78
TD134-15	0.283018	0.000011	0.001142	0.024235	180.1	8.7	12.5	333	32	-0.97	422	51	523	73
TD134-16	0.283153	0.000010	0.001129	0.023995	180.1	13.5	17.3	139	30	-0.97	115	47	88	67
注：ε_Hf(0)=((¹⁷⁶Hf/¹⁷⁷Hf)s/(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, O}-1)×10000，f_Lu/Hf=(¹⁷⁶Lu/¹⁷⁷Hf)s/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1, ε_Hf(t)=((¹⁷⁶Hf/¹⁷⁷Hf)s- (¹⁷⁶Lu/¹⁷⁷Hf)s×(e^λt-1))/((¹⁷⁶Hf/¹⁷⁷Hf))_{CHUR, O}-(¹⁷⁶Lu/¹⁷⁷Hf) _CHUR ×(e^λt-1))-1)×10000, (¹⁷⁶Hf/¹⁷⁷Hf)t=(¹⁷⁶Hf/¹⁷⁷Hf)s-(¹⁷⁶Lu/¹⁷⁷Hf)s×(e^λt-1)。其中，(¹⁷⁶Lu/¹⁷⁷Hf)s和(¹⁷⁶Hf/¹⁷⁷Hf)s为样品测定值，(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR=0.0332，(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, O}=0.282772^[31]。t为样品形成时间，λ=1.867×10^-11 year^-1^[31]

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表 4 拉萨地体南部晚三叠世—中侏罗世岩浆岩锆石U-Pb年龄数据(表中序号①～⑧与图 1-c、d序号相对应)

Table 4 Summary of the zircon U-Pb isotopic ages of the Late Triassic to Middle Jurassic magmatic rocks on the southern margin of Lhasa terrane

样号	岩性	采样位置	方法(锆石)	年龄/Ma	图中位置/参考文献
Td134	闪长岩	E88°42′47″、N29°21′51″	MC-ICP-MS	180.1	①/本文
Td136	花岗闪长岩	E88°40′39″、N29°21′51″	MC-ICP-MS	175	①/本文
X-1	含矿石英闪长玢岩	E88°25′53″、N29°21′50″	MC-ICP-MS	161.1	①/^[8]
ZK5056-4	含矿石英闪长玢岩	E88°25′40″、N29°21′50″	MC-ICP-MS	167.5	①/^[8]
7226-233.7	石英闪长玢岩	E88°26.00′、N29°22.00′	SHRIMP	181.8	①/^[8]
7224-159.9	石英闪长玢岩	E88°26.01′、N29°22.01′	SHRIMP	175.7	①/^[8]
7235-123.4	石英闪长玢岩	E88°26.02′、N29°22.02′	SHRIMP	179	①/^[8]
Tafti-1	石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	173	①/^[7]
Tafti-2	石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	171.7	①/^[7]
Tafti-3	石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	171.3	①/^[7]
Tafti-4	细粒闪长岩	E88°26.02′、N29°22.02′	MC-ICP-MS	172.4	①/^[7]
Tafti-5	细粒闪长岩	E88°26.02′、N29°22.02′	MC-ICP-MS	173.5	①/^[7]
Tafti-6	细粒闪长岩	E88°26.02′、N29°22.02′	MC-ICP-MS	149.1	①/^[7]
Tafti-7	石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	171.8	①/^[7]
Tafti-8	花岗闪长岩	E88°26.02′、N29°22.02′	MC-ICP-MS	173.9	①/^[7]
Tafti-9	花岗闪长岩	E88°26.02′、N29°22.02′	MC-ICP-MS	174.8	①/^[7]
Tafti-10	细粒闪长岩	E88°26.02′、N29°22.02′	MC-ICP-MS	177.1	①/^[7]
Tafti-11	石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	177.2	①/^[7]
Tafti-12	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	177.8	①/^[7]
Tafti-13	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	178	①/^[7]
Tafti-14	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	178.1	①/^[7]
Tafti-15	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	179.4	①/^[7]
Tafti-16	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	179.5	①/^[7]
Tafti-17	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	180.2	①/^[7]
Tafti-18	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	181	①/^[7]
Tafti-19	矿化石英闪长玢岩	E88°26.02′、N29°22.02′	MC-ICP-MS	182.5	①/^[7]
Tafti-20	玄武岩	E88°26.02′、N29°22.02′	MC-ICP-MS	184.5	①/^[7]
Tafti-21	蚀变镁铁质凝灰岩	E88°26.02′、N29°22.02′	MC-ICP-MS	186.9	①/^[7]
XC5-01	花岗闪长玢岩脉	E88°26.00′、N29°22.00′	MC-ICP-MS	179	①/^[37]
XC5002	花岗闪长玢岩脉	E88°26.00′、N29°22.00′	MC-ICP-MS	175	①/^[37]
5036-303	闪长玢岩	E88°26.00′、N29°22.00′	MC-ICP-MS	173	①/^[6]
XRX-1	英云闪长岩	E88°45.54′、N29°21.92′	LA-ICP-MS	182	②/^[3]
XRX-2	英云闪长岩	E88°45.60′、N29°21.92′	LA-ICP-MS	181	②/^[3]
XRX-3	花岗闪长岩	E88°41.25′、N29°21.96′	LA-ICP-MS	178	②/^[3]
XRX-4	英云闪长岩	E88°41.24′、N29°21.94′	LA-ICP-MS	184	②/^[3]
XRX-5	英云闪长岩	E88°38.19′、N29°21.94′	LA-ICP-MS	180	②/^[3]
XRX-37	花岗闪长岩	E88°43.45′、N29°21.88′	LA-ICP-MS	170	②/^[3]
XRX-38	花岗闪长斑岩	E88°43.77′、N29°21.82′	LA-ICP-MS	168	②/^[3]
XRX-40	蚀变花岗闪长岩	E88°50.67′、N29°22.18′	LA-ICP-MS	172	②/^[3]
06FW164	二长花岗岩	E89°37.4′、N29°31.32′	MC-ICP-MS	185	③/^[17]
06FW165	花岗闪长片麻岩	E89°37.87′、N29°30.2′	MC-ICP-MS	194	③/^[17]
06FW166	二长花岗片麻岩	E89°37.87′、N29°30.2′	MC-ICP-MS	205	③/^[17]
06FW167	二长花岗岩	E89°37.92′、N29°26.38′	MC-ICP-MS	156	③/^[17]
06FW168	角闪闪长岩	E89°37.92′、N29°26.38′	MC-ICP-MS	174	③/^[17]
06FW169	正长花岗岩墙	E89°37.92′、N29°26.38′	MC-ICP-MS	152	③/^[17]
XN-8	英云闪长岩	E89°37.85′、N29°29.78′	LA-ICP-MS	170	③/^[3]
CT10-2-1	闪长岩	E89°38′01″、N29°29′59″	LA-ICP-MS	180.9	③/^[16]
CT10-2-3	闪长岩	E89°37′53″、N29°30′12″	LA-ICP-MS	181	③/^[16]
XG4-7-1	花岗闪长岩	E89°37′19″、N29°31′38″	LA-ICP-MS	182	③/^[16]
XG4-9-1	花岗闪长岩	E89°37′29″、N29°29′39″	LA-ICP-MS	169.2	③/^[16]
XY7-5-2	花岗岩	E89°37′29″、N29°31′03″	LA-ICP-MS	191.2	③/^[16]
ST134A*	花岗闪长岩	E89°37.2′、N29°31.2′	MC-ICP-MS	188.1	③/^[12]
T384	黑云母二长花岗岩	E90°11.47′、N29°21.36′	LA-ICP-MS	178	④/^[12]
XN-20	花岗闪长岩	E90°11.47′、N29°21.36′	LA-ICP-MS	180	④/^[3]
CT10-1-1	花岗岩	E90°11′17″、N29°21′28″	LA-ICP-MS	179.9	④/^[16]
CT8-1-1	角闪辉长岩	E90°36′11″、N29°19′48″	LA-ICP-MS	209.9	⑤/^[5]
CT8-1-8	角闪辉长岩	E90°36′11″、N29°19′48″	LA-ICP-MS	210.8	⑤/^[5]
CT8-1-13	角闪辉长岩	E90°36′11″、N29°19′48″	LA-ICP-MS	212.4	⑤/^[5]
CT8-2-5	角闪辉长岩	E90°36′11″、N29°19′48″	LA-ICP-MS	210.2	⑤/^[5]
10SR-23	火山凝灰岩	E92°02′、N29°16′	LA-ICP-MS	189	⑥/^[19]
10SR-13	安山岩	E92°02′、N29°16′	LA-ICP-MS	195	⑥/^[19]
T09-14-2	花岗闪长片麻岩	桑日	LA-ICP-MS	190.4	⑥/^[18]
T09-15-1	花岗闪长片麻岩	桑日	LA-ICP-MS	180	⑥/^[18]
T09-16-1	二长花岗岩	加查	LA-ICP-MS	195.3	⑦/^[18]
T09-16-2	花岗闪长岩	加查	LA-ICP-MS	196.5	⑦/^[18]
T09-16-3	花岗闪长岩	加查	LA-ICP-MS	202	⑦/^[18]
JD-1	砂岩	E88°22′14″、N29°09′19″	MC-ICP-MS	182	⑧/^[32]
09FW171	砂岩	E88°51′34″、N29°18′47″	MC-ICP-MS	185	⑧/^[32]
09FW172	砂岩	E88°48′28″、N29°13′22″	MC-ICP-MS	171	⑧/^[32]

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