西藏扎布耶茶卡北部早白垩世侵入岩锆石U-Pb年龄、地球化学特征及其地质意义

侯云岭; 黄柏鑫; 贾小川; 杨学俊; 叶春林; 吕志伟; 杨蕻

西藏扎布耶茶卡北部早白垩世侵入岩锆石U-Pb年龄、地球化学特征及其地质意义

四川省地质调查院, 四川成都 610081

基金项目:
中国地质调查局项目《冈底斯-喜马拉雅铜矿资源基地调查》（编号：DD20160015）和《西藏扎布耶茶卡北地区1:5万H45E002001、H45E002002、H45E003001、H45E003002四幅区域地质矿产调查》（编号：121201010000150014-13）

详细信息

作者简介: 侯云岭(1988-), 男, 硕士, 助理工程师, 从事区域地质调查与研究。E-mail:yunlinghou@126.com

中图分类号: P534.5;P597⁺.3

收稿日期: 2016-09-10

修回日期: 2017-08-28

刊出日期: 2017-10-25

Zircon U-Pb ages and geochemistry of the Early Creta-ceous intrusive rocks in the north of Zabuye salt lake area, Tibet, and their geological significance

Sichuan Institute of Geological Survey, Chengdu 610081, Sichuan, China

Received Date: 10 September 2016

Revised Date: 28 August 2017

Publish Date: 25 October 2017

摘要

摘要:
中冈底斯带在早白垩世发生的大规模岩浆爆发事件的成因模式仍然存在争议。对中冈底斯带扎布耶茶卡北部区域岩浆岩的野外特征、锆石U-Pb年龄、全岩地球化学特征进行研究，结果表明，扎布耶茶卡北部岩体主要侵位于142Ma和100Ma，2期岩浆作用均包含中酸性岩体和辉长岩脉体。第一期（约142Ma）岩体属I型偏铝质高钾钙碱性系列花岗质岩体，第二期（约100Ma）岩体为偏铝质高钾钙碱性系列闪长质岩体。2期中酸性岩体均富集Rb、Ba、Th、U等大离子亲石元素，相对亏损Nb、Ta等高场强元素，并显示强烈的壳-幔岩浆混合特征。结合前人研究资料，扎布耶茶卡北部第一期花岗质岩体及辉长岩脉为南向俯冲的班公湖-怒江洋壳板片回转引起的岩浆作用；第二期闪长质岩体及辉长岩脉为班公湖-怒江洋壳板片断离的岩浆作用的响应。该研究成果为班公湖-怒江洋的南向俯冲、板片回转和板片断离演化模式提供了岩浆作用证据。
- 中冈底斯带 /
- LA-ICP-MS锆石U-Pb年龄 /
- 全岩地球化学 /
- 班公湖-怒江洋演化
Abstract:
The genetic model of the widely distributed magmatism in the Mid-Gangdise belt of Tibet during Early Cretaceous is still controversial. The authors conducted field observation, zircon U-Pb dating and geochemical studies of the intrusions from Zabuye salt lake in the Mid-Gangdise belt. Zircon U-Pb age dating suggests that the the intrusion of Zabuye salt lake magma occurred in two periods (142Ma and 100Ma), and both have intermediate to acidic plutons and gabbro dikes. The first phase plutons are I-type metaluminous and high-k calcalkaline series granitic rocks, whereas the second phase plutons belong to metaluminous high-k calcalkaline series dioritic intrusions. Both intermediate to acidic plutons show enrichment of LILE (Rb, Ba, Th and U) and depletion of HFSE (Nb, Ta), with strong magma mixing characters.The data collected from previous researchers show that the first phase granitic plutons and gabbro dike were induced by the roll-back of the subducted Bangong-Nujiang Oceanic slab, while the second phase plutons and dike resulted from the oceanic slab break-off. The results obtained by the authors provide evidence for the southern direction subduction, roll-back and break-off of the Bangong-Nujiang Oceanic slab.
- Mid-Gangdise belt /
- LA-ICP-MS zircon U-Pb age /
- whole rock geochemistry /
- Bangong-Nujiang Ocean evolution

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图 1 青藏高原构造单元划分（a）和中冈底斯早白垩世岩浆岩分布及年龄（b, 据参考文献[8]修改）

Figure 1.

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图 2 研究区地质简图及采样位置^[20]

Figure 2.

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图图版Ⅰ

Figure 图版Ⅰ.

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图 4 扎布耶茶卡北部中酸性侵入岩及辉长岩脉定年样品的锆石U-Pb谐和图

Figure 4.

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图 3 扎布耶茶卡北部定年样品的锆石阴极发光图像

Figure 3.

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图 5 扎布耶茶卡北部侵入岩岩石类型判别图解

Figure 5.

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图 6 扎布耶茶卡北部岩体的构造环境判别图

Figure 6.

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图 7 扎布耶茶卡北部侵入岩球粒陨石标准化稀土元素配分图解^[36]（a）和微量元素原始地幔标准化蜘蛛图解^[37]（b）（上地壳数据据参考文献[34])

Figure 7.

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图 8 扎布耶茶卡北部侵入岩选择性地球化学散点图（图f据参考文献[46]修改；前人数据据参考文献[9, 40, 42]）

Figure 8.

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图 9 中冈底斯早白垩世时期构造岩浆演化示意图（北冈底斯113Ma年龄数据据参考文献[8, 12]）

Figure 9.

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表 1 扎布耶茶卡北部侵入岩LA-ICP-MS锆石U-Th-Pb定年结果

Table 1. LA-ICP-MS zircon U-Th-Pb data of the intrusive rocks in the north of Zabuye salt lake area

测点编号	Th/U	元素含量/10^-6			同位素比值								年龄/Ma
测点编号	Th/U	²³⁸U	²³²Th	²⁰⁶Pb	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
D4246，二长花岗岩
3	0.69	246	170	4.6	0.0489	0.0013	0.1525	0.0041	0.0226	0.0003	0.0073	0.0004	144	4	144	2
4	0.92	212	194	4.0	0.0493	0.0020	0.1502	0.0059	0.0221	0.0004	0.0065	0.0006	142	5	141	2
5	0.71	292	208	5.0	0.0489	0.0015	0.1522	0.0048	0.0226	0.0004	0.0065	0.0004	144	4	144	2
6	0.61	191	116	3.6	0.0489	0.0028	0.1499	0.0083	0.0223	0.0005	0.0071	0.0010	142	7	142	3
8	0.75	187	140	3.4	0.0491	0.0015	0.1500	0.0046	0.0222	0.0003	0.0072	0.0006	142	4	141	2
10	0.50	427	214	7.3	0.0488	0.0011	0.1473	0.0034	0.0219	0.0003	0.0071	0.0005	140	3	140	2
14	0.73	167	122	2.9	0.0488	0.0014	0.15	0.004	0.022	0.00033	0.0070	0.00036	142	4	142	2
15	1.06	172	184	2.9	0.0488	0.0023	0.15	0.007	0.023	0.00043	0.0070	0.00062	144	6	144	3
D4830，二长花岗岩
1	0.84	213	179	4.1	0.0491	0.0011	0.1636	0.0039	0.0242	0.0003	0.0085	0.0004	154	3	154	2
2	0.76	112	85	2.3	0.0488	0.0025	0.1604	0.0080	0.0238	0.0005	0.0083	0.0008	151	7	152	3
3	0.51	196	101	3.4	0.0489	0.0021	0.1592	0.0066	0.0236	0.0004	0.0079	0.0006	150	6	150	3
4	0.72	232	167	4.3	0.0491	0.0012	0.1584	0.0038	0.0234	0.0003	0.0080	0.0004	149	3	149	2
5	0.58	224	131	4.1	0.0492	0.0012	0.1587	0.0040	0.0234	0.0003	0.0083	0.0005	150	4	149	2
6	0.79	244	194	4.6	0.0494	0.0012	0.1646	0.0040	0.0242	0.0004	0.0090	0.0005	155	3	154	2
7	0.62	300	186	5.5	0.0489	0.0011	0.1576	0.0036	0.0234	0.0003	0.0084	0.0005	149	3	149	2
8	0.94	373	353	6.3	0.0490	0.0013	0.1506	0.0041	0.0223	0.0003	0.0075	0.0006	142	4	142	2
9	0.65	192	125	3.6	0.0491	0.0014	0.1607	0.0046	0.0238	0.0004	0.0082	0.0006	151	4	151	2
10	0.49	451	219	8.0	0.0488	0.0010	0.1560	0.0033	0.0232	0.0003	0.0080	0.0005	147	3	148	2
11	0.67	127	85	2.3	0.0489	0.0015	0.1585	0.0048	0.0235	0.0004	0.0086	0.0004	149	4	150	2
12	2.04	306	620	5.6	0.0490	0.0015	0.1514	0.0044	0.0224	0.0003	0.0058	0.0004	143	4	143	2
15	0.61	343	210	6.2	0.0492	0.0010	0.1611	0.0036	0.0238	0.0003	0.0079	0.0004	152	3	151	2
16	0.78	117	91	2.3	0.0495	0.0016	0.1648	0.0053	0.0241	0.0004	0.0087	0.0006	155	5	154	2
17	0.65	154	99	2.9	0.0494	0.0013	0.1639	0.0045	0.0241	0.0004	0.0091	0.0006	154	4	153	2
19	0.75	197	148	3.7	0.0493	0.0013	0.1626	0.0043	0.0239	0.0004	0.0083	0.0006	153	4	152	2
20	0.68	274	184	5.4	0.0490	0.0018	0.1669	0.0059	0.0247	0.0004	0.0077	0.0009	157	5	157	3
D4392，花岗闪长岩
1	0.58	106	62	1.9	0.0489	0.0016	0.1565	0.0050	0.0232	0.0004	0.0054	0.0002	148	4	148	2
2	0.67	119	79	2.0	0.0486	0.0021	0.1518	0.0063	0.0227	0.0004	0.0048	0.0003	144	6	144	3
3	0.79	77	60	1.6	0.0493	0.0031	0.1705	0.0104	0.0251	0.0006	0.0074	0.0007	160	9	160	3
4	0.73	63	46	1.2	0.0489	0.0034	0.1493	0.0101	0.0221	0.0005	0.0065	0.0006	141	9	141	3
5	0.61	98	59	1.7	0.0488	0.0020	0.1526	0.0060	0.0227	0.0004	0.0063	0.0004	144	5	145	2
6	0.64	102	66	1.7	0.0488	0.0021	0.1441	0.0061	0.0214	0.0004	0.0062	0.0005	137	5	137	2
9	0.62	91	57	1.5	0.0490	0.0018	0.1499	0.0054	0.0222	0.0004	0.0054	0.0003	142	5	141	2
10	0.63	190	120	3.0	0.0489	0.0020	0.1499	0.0061	0.0222	0.0004	0.0043	0.0004	142	5	142	3
11	0.61	71	44	1.2	0.0488	0.0033	0.1467	0.0095	0.0218	0.0005	0.0063	0.0007	139	8	139	3
13	0.77	115	89	2.0	0.0494	0.0020	0.1552	0.0062	0.0228	0.0004	0.0077	0.0004	147	5	145	3
14	0.62	89	55	1.6	0.0491	0.0017	0.1521	0.0053	0.0225	0.0004	0.0076	0.0004	144	5	143	2
16	0.74	183	135	3.1	0.0491	0.0014	0.1492	0.0043	0.0221	0.0003	0.0075	0.0004	141	4	141	2
17	0.79	132	104	2.3	0.0489	0.0035	0.1501	0.0104	0.0223	0.0006	0.0079	0.0011	142	9	142	3
20	0.59	74	44	1.3	0.0503	0.0039	0.1545	0.0115	0.0223	0.0006	0.0074	0.0009	146	10	142	4
D4001，闪长岩
1	0.79	534	425	8.1	0.0472	0.0009	0.1244	0.0025	0.0191	0.0003	0.0058	0.0002	119	2	122	2
2	0.96	353	339	4.3	0.0498	0.0013	0.1055	0.0027	0.0154	0.0002	0.0049	0.0001	102	2	98	1
D4001，闪长岩
3	0.47	3435	1595	52	0.0483	0.0008	0.1260	0.0022	0.0189	0.0003	0.0020	0.0001	120	2	121	2
4	0.96	246	237	3.2	0.0473	0.0014	0.1062	0.0033	0.0163	0.0002	0.0050	0.0001	102	3	104	2
5	0.99	353	349	4.7	0.0473	0.0012	0.1090	0.0027	0.0167	0.0002	0.0054	0.0001	105	3	107	1
6	0.88	715	628	13	0.0472	0.0008	0.1504	0.0027	0.0231	0.0003	0.0053	0.0001	142	2	147	2
7	0.99	446	442	6.0	0.0465	0.0010	0.1079	0.0025	0.0168	0.0002	0.0055	0.0001	104	2	108	1
8	0.78	1513	1170	25	0.0490	0.0007	0.1423	0.0022	0.0211	0.0003	0.0069	0.0002	135	2	134	2
9	0.93	228	212	3.0	0.0490	0.0015	0.1126	0.0035	0.0167	0.0002	0.0052	0.0002	108	3	107	2
10	0.15	602	93	9.1	0.0486	0.0020	0.1283	0.0050	0.0192	0.0003	0.0054	0.0004	123	5	122	2
11	1.01	286	289	3.6	0.0461	0.0030	0.0976	0.0061	0.0154	0.0003	0.0049	0.0001	95	6	98	2
12	0.55	225	124	3.2	0.0481	0.0016	0.1147	0.0038	0.0173	0.0003	0.0057	0.0002	110	3	111	2
13	0.99	233	232	3.1	0.0496	0.0017	0.1121	0.0037	0.0164	0.0002	0.0053	0.0002	108	3	105	2
14	1.04	475	494	6.3	0.0473	0.0011	0.1061	0.0026	0.0163	0.0002	0.0053	0.0002	102	2	104	1
15	0.83	393	326	5.5	0.0468	0.0012	0.1094	0.0028	0.0169	0.0002	0.0054	0.0002	105	3	108	1
16	1.67	1103	1841	20	0.0487	0.0008	0.1516	0.0026	0.0226	0.0003	0.0068	0.0002	143	2	144	2
17	0.72	957	694	18	0.0475	0.0008	0.1489	0.0026	0.0227	0.0003	0.0071	0.0002	141	2	145	2
18	1.03	348	359	4.5	0.0483	0.0014	0.1045	0.0030	0.0157	0.0002	0.0051	0.0002	101	3	100	1
20	0.19	1178	221	21	0.0499	0.0008	0.1512	0.0025	0.0220	0.0003	0.0051	0.0002	143	2	140	2
D4921，闪长岩
2	1.00	515	517	6.3	0.0482	0.0010	0.1046	0.0022	0.0158	0.0002	0.0048	0.0002	101	2	101	1
3	0.97	281	273	3.3	0.0489	0.0021	0.1056	0.0044	0.0157	0.0003	0.0050	0.0004	102	4	100	2
4	0.70	586	414	7.2	0.0482	0.0010	0.1050	0.0022	0.0158	0.0002	0.0050	0.0002	101	2	101	1
5	1.02	266	272	3.2	0.0495	0.0014	0.1071	0.0030	0.0157	0.0002	0.0038	0.0002	103	3	100	2
6	0.94	237	224	2.9	0.0490	0.0013	0.1063	0.0029	0.0158	0.0002	0.0049	0.0003	103	3	101	1
7	1.08	254	274	3.1	0.0495	0.0013	0.1070	0.0029	0.0157	0.0002	0.0048	0.0003	103	3	100	1
8	1.05	499	524	5.5	0.0480	0.0031	0.1040	0.0064	0.0157	0.0004	0.0019	0.0002	100	6	101	2
9	0.68	435	296	4.8	0.0526	0.0032	0.1151	0.0068	0.0159	0.0004	0.0028	0.0003	111	6	102	2
10	1.15	260	300	3.3	0.0484	0.0033	0.1046	0.0068	0.0157	0.0004	0.0039	0.0006	101	6	100	2
11	1.19	180	214	2.1	0.0485	0.0031	0.1023	0.0063	0.0153	0.0003	0.0036	0.0003	99	6	98	2
12	1.06	357	381	4.4	0.0480	0.0011	0.1031	0.0024	0.0156	0.0002	0.0045	0.0002	100	2	100	1
13	1.11	107	119	1.4	0.0483	0.0048	0.1048	0.0099	0.0157	0.0005	0.0037	0.0005	101	9	101	3
15	0.73	227	166	2.7	0.0480	0.0019	0.1059	0.0041	0.0160	0.0003	0.0040	0.0002	102	4	102	2
17	1.12	312	351	3.7	0.0477	0.0012	0.1012	0.0027	0.0154	0.0002	0.0040	0.0002	98	2	98	1
18	1.04	255	267	3.2	0.0478	0.0016	0.1008	0.0033	0.0153	0.0002	0.0041	0.0003	98	3	98	2
20	0.87	196	170	2.4	0.0471	0.0015	0.1030	0.0032	0.0159	0.0003	0.0045	0.0003	100	3	101	2
D4257，辉长岩
2	1.10	275	302	4.7	0.0488	0.0011	0.1475	0.0035	0.0219	0.0003	0.0066	0.0003	140	3	140	2
4	1.01	460	466	7.7	0.0489	0.0011	0.1502	0.0035	0.0223	0.0003	0.0065	0.0003	142	3	142	2
5	1.33	486	649	8.3	0.0486	0.0010	0.1471	0.0030	0.0220	0.0003	0.0065	0.0003	139	3	140	2
6	0.83	233	193	4.1	0.0489	0.0013	0.1517	0.0039	0.0225	0.0003	0.0070	0.0004	143	3	143	2
7	1.22	271	330	4.6	0.0489	0.0017	0.1521	0.0052	0.0226	0.0004	0.0070	0.0005	144	5	144	2
8	0.61	216	132	3.8	0.0489	0.0012	0.1506	0.0038	0.0223	0.0003	0.0074	0.0004	142	3	142	2
12	1.14	208	236	3.5	0.0509	0.0012	0.1523	0.0038	0.0217	0.0003	0.0071	0.0003	144	3	139	2
15	1.01	107	109	1.9	0.0492	0.0016	0.1537	0.0051	0.0227	0.0004	0.0073	0.0004	145	4	144	2
16	1.30	238	310	4.1	0.0490	0.0012	0.1484	0.0037	0.0220	0.0003	0.0069	0.0004	140	3	140	2
17	1.03	187	192	3.2	0.0494	0.0013	0.1507	0.0041	0.0221	0.0003	0.0068	0.0004	142	4	141	2
18	0.85	354	302	6.2	0.0494	0.0011	0.1535	0.0034	0.0226	0.0003	0.0072	0.0004	145	3	144	2
D4713，辉长岩
1	1.49	765	1137	9.8	0.0482	0.0011	0.1075	0.0024	0.0162	0.0002	0.0046	0.0003	104	2	103	1
2	0.75	145	109	2.6	0.0488	0.0023	0.1529	0.0069	0.0227	0.0004	0.0068	0.0005	145	6	145	3
5	0.88	311	274	4.0	0.0475	0.0015	0.1054	0.0033	0.0161	0.0003	0.0049	0.0003	102	3	103	2
9	0.63	87	54	1.5	0.0481	0.0031	0.1469	0.0091	0.0222	0.0005	0.0070	0.0008	139	8	141	3
10	0.79	151	119	2.7	0.0495	0.0024	0.1515	0.0071	0.0222	0.0004	0.0067	0.0007	143	6	142	3
12	0.58	1030	599	14	0.0483	0.0009	0.1118	0.0022	0.0168	0.0002	0.0054	0.0003	108	2	107	1
13	0.65	237	154	2.8	0.0481	0.0019	0.1013	0.0039	0.0153	0.0003	0.0053	0.0004	98	4	98	2
14	0.51	1188	610	15	0.0482	0.0008	0.1087	0.0019	0.0164	0.0002	0.0054	0.0003	105	2	105	1
15	1.96	908	1771	11	0.0478	0.0008	0.1081	0.0020	0.0164	0.0002	0.0038	0.0002	104	2	105	1
18	0.70	173	121	2.8	0.0487	0.0018	0.1462	0.0054	0.0218	0.0004	0.0073	0.0006	139	5	139	2
19	1.37	1935	2644	23	0.0482	0.0008	0.1013	0.0018	0.0153	0.0002	0.0041	0.0003	98	2	98	1
20	0.82	239	196	3.9	0.0483	0.0021	0.1476	0.0064	0.0222	0.0004	0.0072	0.0007	140	6	141	3

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表 2 扎布耶茶卡北部侵入岩全岩地球化学数据

Table 2. Chemical compositions of the studied intrusive rocks in the north of Zabuye salt lake area

样品号	D4246	二长花岗岩	D4392	D4804	D4869	D4001	D4921	D4257	D4713
年龄/Ma	142.1	73.50	142.4			98.9	100.2	141.7	98.0
岩石类型	二长花岗岩	0.25	花岗闪长岩	花岗闪长岩	花岗闪长岩	闪长岩	闪长岩	辉长岩	辉长岩
SiO₂	73.55	13.20	68.40	63.35	71.25	55.79	56.64	45.60	46.18
TiO₂	0.27	0.81	0.39	0.49	0.34	1.02	0.92	1.57	0.88
Al₂O₃	13.39	0.63	15.37	15.27	14.00	16.24	16.53	17.19	18.84
Fe₂O₃	1.02	0.08	1.36	1.67	1.38	2.43	2.24	7.62	4.18
FeO	0.75	0.73	1.70	2.90	1.27	5.10	5.40	6.25	4.70
MnO	0.17	1.47	0.07	0.15	0.07	0.16	0.14	0.21	0.13
MgO	0.61	3.51	1.43	2.05	1.12	4.35	4.11	4.62	5.42
CaO	1.30	4.09	3.64	3.62	2.64	7.88	8.12	10.87	15.10
Na₂O	3.34	0.07	2.70	3.95	3.28	2.76	2.73	2.39	1.77
K₂O	4.13	1.35	3.48	2.59	2.84	1.90	1.87	0.98	0.47
P₂O₅	0.08	99.70	0.09	0.13	0.09	0.19	0.23	0.12	0.20
烧失量	1.05	1.03	0.95	3.28	1.15	1.38	0.27	1.65	1.36
总量	99.66	41.99	99.58	99.44	99.45	99.20	99.21	99.06	99.22
A/CNK	1.09	84.20	1.04	0.96	1.05	0.78	0.78	0.69	0.61
La	49.61	8.70	32.77	25.94	35.78	18.53	19.64	12.78	7.30
Ce	89.18	30.00	56.16	48.02	58.24	37.08	39.05	24.74	14.22
Pr	10.16	5.05	6.33	5.95	6.28	5.04	5.23	3.44	2.05
Nd	35.22	1.25	21.26	22.06	20.02	20.72	20.97	14.36	9.05
Sm	5.81	4.63	3.54	4.25	3.01	4.44	4.55	3.39	2.21
Eu	1.29	0.75	0.93	1.15	0.92	1.21	1.22	1.24	0.78
Gd	5.34	3.81	3.49	4.25	2.93	4.35	4.56	3.59	2.31
Tb	0.84	0.76	0.59	0.76	0.46	0.76	0.77	0.64	0.44
Dy	4.40	2.22	3.01	4.04	2.29	4.09	4.09	3.44	2.36
Ho	0.86	0.38	0.61	0.83	0.48	0.81	0.81	0.67	0.46
Er	2.58	2.48	1.81	2.38	1.43	2.27	2.32	1.92	1.29
Tm	0.46	0.35	0.33	0.42	0.26	0.35	0.40	0.32	0.20
Yb	2.84	21.19	2.07	2.72	1.70	2.36	2.43	1.95	1.24
Lu	0.41	1.27	0.30	0.38	0.24	0.32	0.34	0.28	0.17
Y	24.76	2.50	17.36	22.47	13.60	21.19	22.71	18.22	11.47
Co	2.02	31.32	7.17	8.82	4.64	22.98	22.90	37.35	29.49
Cu	3.02	120.67	12.17	5.14	6.69	84.52	49.10	52.11	69.36
Zn	107.40	132.80	39.41	68.96	27.33	90.85	79.83	122.73	59.10
Rb	150.48	10.78	132.22	73.72	80.37	84.19	77.56	46.19	19.46
Zr	144.50	0.28	142.80	122.50	134.30	170.30	169.90	59.20	43.00
Nb	81.24	10.91	9.43	7.26	7.28	47.15	10.91	8.04	74.16
Mo	0.58	0.80	0.40	0.55	0.22	0.68	1.37	0.54	0.41
Hf	8.55	1.07	9.09	6.80	10.78	13.21	13.72	4.39	2.37
Ta	3.81	25.43	0.76	0.61	0.55	2.57	0.88	0.55	2.58
W	1.51	16.72	0.84	1.32	0.50	0.95	1.04	0.63	0.66
Pb	19.57	2.39	19.36	15.59	1655	11.82	12.17	7.10	8.11
Th	17.23	771.34	15.21	8.46	15.29	8.75	11.21	3.63	2.52
U	1.23	192.76	1.97	1.78	0.87	1.57	1.94	0.63	0.58
Ba	813.21	14.71	623.79	609.59	906.54	232.33	222.97	177.13	94.21
Sr	231.34	0.61	251.56	393.70	240.56	348.75	322.91	422.03	658.37
V	17.64	0.15	56.57	90.4	46.48	191.0	198.8	425.7	376.1
As	0.93	2.24	1.96	0.47	1.35	4.69	3.42	1.12	1.33
Sb	0.18	0.04	0.40	0.17	0.16	0.40	0.25	0.29	0.64
Sn	2.24	0.32	3.35	1.52	1.31	3.31	1.52	1.73	1.01
Ag	0.05		0.04	0.02	0.03	0.05	0.04	0.09	0.08
Au	0.41		0.42	3.29	0.87	2.78	0.58	0.41	17.29
注：主量元素含量单位为%，微量和稀土元素含量为10^-6

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表 3 西藏中冈底斯早白垩世岩浆岩的年龄及分布

Table 3. Isotopic ages of representative intrusive rocks of the Early Creataceous in the Mid-Gangdise belt, Tibet

地名或岩体	定年的岩石名称	定年矿物/方法	年龄/Ma	参考文献
雄巴南东	流纹岩	SHRIMP锆石U-Pb	142.9±1.0	[8]
尼玛县南	二云母二长花岗岩	黑云母K-Ar稀释法	142±4	[38]
雄巴东	流纹岩	LA-ICP-MS锆石U-Pb	143±2	[7]
雄巴南东	英云闪长岩	LA-ICP-MS锆石U-Pb	134.3±1.7	[8]
雄巴南东	流纹质火山角砾岩	LA-ICP-MS锆石U-Pb	133.8±1.1	[8]
尼玛县南	白云母正长花岗岩	黑云母K-Ar稀释法	132±4	[38]
措勤北	英安岩	LA-ICP-MS锆石U-Pb	130±1	[7]
雄巴东	流纹岩	LA-ICP-MS锆石U-Pb	129±1	[7]
措勤北	英安岩	LA-ICP-MS锆石U-Pb	121±1	[7]
申扎	英安岩	LA-ICP-MS锆石U-Pb	114.0±0.7	[8]
申扎	英安岩	LA-ICP-MS锆石U-Pb	113.8±0.5	[8]
措勤地区	熔结凝灰岩	LA-ICP-MS锆石U-Pb	112.7±1.0	[39]
申扎地区	花岗闪长岩	LA-ICP-MS锆石U-Pb	113.6±0.7	[10]
申扎	英安岩	LA-ICP-MS锆石U-Pb	112.1±0.4	[8]
措勤北	流纹质凝灰岩	LA-ICP-MS锆石U-Pb	112±1	[7]
申扎	英安岩	LA-ICP-MS锆石U-Pb	110.9±0.5	[8]
申扎县买巴地区	石英二长岩	LA-ICP-MS锆石U-Pb	111.0±1.1	[40]
申扎县买巴地区	花岗岩	LA-ICP-MS锆石U-Pb	110.8±0.9	[40]
扎康西	粗面英安岩	LA-ICP-MS锆石U-Pb	110.2±1.1	[41]
措勤地区	熔结凝灰岩	LA-ICP-MS锆石U-Pb	108.6±1.6	[39]
扎康西	流纹岩	LA-ICP-MS锆石U-Pb	108.3±0.4	[41]
措勤北	花岗闪长岩	LA-ICP-MS锆石U-Pb	107±1	[7]
天宫尼勒	花岗闪长岩	LA-ICP-MS锆石U-Pb	102.6±1.8	[42]

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①	黄柏鑫, 叶春林, 吕志伟, 等. 西藏扎布耶茶卡北地区四幅区域地质矿产调查报告. 2017.

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西藏扎布耶茶卡北部早白垩世侵入岩锆石U-Pb年龄、地球化学特征及其地质意义

四川省地质调查院, 四川 成都 610081

作者简介: 侯云岭(1988-), 男, 硕士, 助理工程师, 从事区域地质调查与研究。E-mail:yunlinghou@126.com

Zircon U-Pb ages and geochemistry of the Early Creta-ceous intrusive rocks in the north of Zabuye salt lake area, Tibet, and their geological significance

Sichuan Institute of Geological Survey, Chengdu 610081, Sichuan, China

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四川省地质调查院, 四川成都 610081