云南香格里拉浪丁岩体锆石U-Pb年龄及地球化学特征

董毅; 邓江红; 刘显凡

云南香格里拉浪丁岩体锆石U-Pb年龄及地球化学特征

1.
外生成矿与矿山环境重庆市重点实验室/重庆地质矿产研究院, 重庆 400042

2.
煤炭资源与安全开采国家重点实验室重庆研究中心, 重庆 400042

3.
成都理工大学地球科学学院, 四川成都 610059

基金项目:
中国地质调查局项目《云南1：5万阿热、小中甸、中村、东坝幅区调》（编号：212011120587）

详细信息

作者简介: 董毅(1987-), 男, 硕士, 高级工程师, 从事地质找矿工作。E-mail:grapedy@hotmail.com

中图分类号: P588.13;P597⁺.3

收稿日期: 2018-09-04

修回日期: 2019-01-10

刊出日期: 2020-03-15

Zircon U-Pb age and geochemical characteristics of Langding intrusion of Shangri-La, Yunnan Province

1.
Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China

2.
Chongqing Research Center of State Key Laboratory of Coal Resources and Safe Mining, Chongqing 400042, China

3.
Chengdu University of Technology, Chengdu 610059, Sichuan, China

Received Date: 04 September 2018

Revised Date: 10 January 2019

Publish Date: 15 March 2020

摘要

摘要:
香格里拉地区广泛分布印支期中-中酸性浅成-超浅成岩体，位于西斑岩带的浪丁岩体主要由角闪闪长玢岩、石英闪长玢岩、含辉石角闪闪长玢岩组成。锆石U-Pb年龄显示岩体侵位于206.4±3.9 Ma。其地球化学特征与埃达克岩相似：SiO₂含量为56.66%~64.84%，平均60.42%；Eu异常不明显（Eu/Eu^*为0.90~1.23，平均为1.08）；富集轻稀土元素和大离子亲石元素，亏损重稀土元素，贫高场强元素；高Sr（490~1165×10^-6，平均842×10^-6）、Sr/Y（37.4~77.2，平均56.9）、La/Yb（21.7~28.4，平均25.6），低Y（13.1×10^-6~17.4×10^-6，平均14.6×10^-6）、Yb（1.20×10^-6~1.56×10^-6，平均1.37×10^-6）。年代学和地球化学研究结果显示，浪丁岩体形成于岛弧环境下，其形成与晚三叠世甘孜理塘洋壳板片的部分熔融有关，该地区的甘孜-理塘洋壳向西俯冲时，可能以较低的角度进入中咱地块之下。
- LA-ICP-MS锆石U-Pb /
- 构造背景 /
- 角闪闪长玢岩 /
- 义敦岛弧 /
- 香格里拉
Abstract:
The west porphyry belt and east porphyry belt in Shangri-La are mainly composed of Indosinian intermediate-acidic intrusive complex rocks.In the western porphyry belt, there are Luanitang porphyry, Xuejiping porphyry, Chundu porphyry, Are porphyry and Langding porphyry from north to south.In the eastern porphyry belt, there are Disuga porphyry, Songnuo porphyry, Pulang porphyry and Lanzhong porphyry from north to south.The Langding porphyry is mainly composed of hornblende diorite porphyrite, quartz diorite porphyrite and pyroxene diorite porphyrite.The zircon U-Pb age indicates that the intrusive rock has an age of 206.4±3.9 Ma.Geochemical characteristics of the Langding porphyry are similar to those of adakite, whose SiO₂ is higher than 56.66, averaging 60.42%, and whose δEu is not distinct (0.90~1.23, averaging 1.08).Chondrite-normalized REE patterns show right-inclined feature, and are characterized by enrichment of LREE and LILE, heavy depletion of HREE, high Sr (490×10^-6~1165×10^-6, averaging 842×10^-6), Sr/Y (37.4~77.2, averaging 56.9) and La/Yb (21.7~28.4, averaging 25.6), but low Y (13.1×10^-6~17.4×10^-6, averaging 14.6×10^-6) and Yb (1.20×10^-6~1.61×10^-6, averaging 1.37×10^-6).The results of the studies of major oxides, REEs, trace elements and zircon U-Pb age show that the Langding rock body was formed in an island arc environment, and its formation was related to the partial melting of the low-angle subduction of Garze-Litang oceanic crust slab.
- LA-ICP-MS zircon U-Pb age /
- tectonic setting /
- hornblende diorite porphyrite /
- Yidun island arc /
- Shangri-La

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图 1 香格里拉地区印支期中酸性岩体分布略图(a, 据参考文献[13]修改)和浪丁岩体地质简图(b)

Figure 1.

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图 2 浪丁岩体部分锆石阴极发光图像及²⁰⁶Pb/²³⁸U年龄

Figure 2.

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图 3 浪丁岩体角闪闪长玢岩锆石U-Pb谐和图

Figure 3.

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图 4 浪丁岩体Zr/TiO₂-SiO₂(a)(底图据参考文献[20])和AFC图解(b)(底图据参考文献[21])

Figure 4.

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图 5 浪丁岩体稀土元素配分型式(a)和微量元素蛛网图(b)(球粒陨石标准值和原始地幔标准值据参考文献[22])

Figure 5.

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图 6 浪丁岩体构造判别图解^[23]

Figure 6.

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图 7 浪丁岩体Y-Sr/Y(a)^[31]及Yb-La/Yb图解(b)^[32]

Figure 7.

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图 8 浪丁岩体Zr-Zr/Sm(a)、MgO-Ce/Pb(b)、La-La/Yb(c)和Rb-Sc(d)图解

Figure 8.

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表 1 浪丁岩体角闪闪长玢岩(AD0526t1)锆石U-Th-Pb同位素数据

Table 1. The zircon U-Th-Pb analytical data of hornblende diorite porphyrite(AD0526t1)of Langding intrusive rock

测点点号	Pb/10^-6	U/10^-6	U-Pb比值						年龄/Ma
测点点号	Pb/10^-6	U/10^-6	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
1	27	627	0.0357	0.0003	0.2538	0.0022	0.0515	0.0004	226	2	230	2	263	17
2	17	390	0.0361	0.0006	0.2626	0.0042	0.0526	0.0007	229	4	237	4	311	28
3	36	763	0.0365	0.0004	0.2622	0.0023	0.0522	0.0004	231	2	236	2	293	17
4	10	243	0.0365	0.0003	0.2557	0.0053	0.0508	0.0010	231	2	231	5	233	47
5	17	439	0.0330	0.0003	0.2273	0.0047	0.0500	0.0010	209	2	208	4	195	48
6	17	402	0.0363	0.0003	0.2613	0.0040	0.0522	0.0008	230	2	236	4	292	34
7	20	434	0.0350	0.0003	0.2570	0.0089	0.0533	0.0015	222	2	232	8	342	65
8	30	723	0.0362	0.0003	0.2650	0.0023	0.0531	0.0005	230	2	239	2	332	19
9	39	920	0.0359	0.0003	0.2537	0.0019	0.0512	0.0003	227	2	230	2	252	15
10	15	360	0.0364	0.0003	0.2546	0.0037	0.0508	0.0007	230	2	230	3	230	31
11	23	271	0.0730	0.0006	0.5728	0.0088	0.0569	0.0009	454	4	460	7	487	33
12	26	659	0.0366	0.0003	0.2522	0.0024	0.0499	0.0004	232	2	228	2	192	19
13	21	488	0.0360	0.0003	0.2556	0.0049	0.0515	0.0009	228	2	231	4	264	40
14	16	114	0.1272	0.0013	1.1417	0.0131	0.0651	0.0007	772	8	773	9	778	21
15	23	564	0.0317	0.0003	0.2257	0.0048	0.0516	0.0011	201	2	207	4	267	48
16	25	605	0.0362	0.0002	0.2521	0.0023	0.0505	0.0004	229	2	228	2	220	20
17	28	742	0.0328	0.0002	0.2375	0.0022	0.0525	0.0005	208	1	216	2	306	20
18	13	73	0.1686	0.0013	1.7340	0.0349	0.0745	0.0014	1004	8	1021	21	1055	37
19	48	285	0.1313	0.0011	1.2081	0.0086	0.0668	0.0004	795	6	804	6	830	13
20	15	373	0.0361	0.0004	0.2555	0.0049	0.0513	0.0009	229	2	231	4	255	41
21	35	967	0.0357	0.0003	0.2534	0.0024	0.0514	0.0004	226	2	229	2	261	20
22	26	609	0.0357	0.0003	0.2546	0.0105	0.0517	0.0017	226	2	230	9	270	76
23	24	655	0.0327	0.0002	0.2318	0.0026	0.0514	0.0005	208	1	212	2	258	24
24	24	804	0.0323	0.0003	0.2291	0.0023	0.0514	0.0004	205	2	209	2	260	20
25	20	498	0.0361	0.0003	0.2504	0.0054	0.0503	0.0009	229	2	227	5	209	44
26	34	818	0.0365	0.0003	0.2533	0.0023	0.0504	0.0004	231	2	229	2	212	19
27	25	588	0.0360	0.0003	0.2580	0.0040	0.0520	0.0008	228	2	233	4	286	34
28	22	520	0.0367	0.0004	0.2630	0.0031	0.0520	0.0005	232	3	237	3	283	23
29	26	570	0.0359	0.0002	0.2529	0.0043	0.0510	0.0008	228	2	229	4	242	38

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表 2 浪丁岩体主量、微量和稀土元素分析结果

Table 2. The content of major, trace and rare earth elements of Langding intrusive rock

样品	AD526	AD527	AD528	AD529	AD531
SiO₂	60.9	56.6	64.8	59.2	60.5
TiO₂	0.63	0.89	0.51	0.70	0.60
Al₂O₃	13.9	14.5	14.8	14.9	14.7
Fe₂O₃	0.65	1.11	0.73	2.18	1.34
FeO	3.83	6.15	3.16	4.13	3.48
MnO	0.09	0.17	0.13	0.14	0.09
MgO	3.51	4.89	2.21	3.77	3.37
CaO	4.71	4.71	2.42	4.11	4.55
Na₂O	5.33	3.49	3.49	3.61	5.32
K₂O	3.81	3.86	5.18	5.04	3.76
P₂O₅	0.45	0.79	0.29	0.58	0.54
烧失量	1.50	2.16	1.94	1.76	1.33
氧化物总量	99.3	99.4	99.7	100	99.6
TFeO	4.44	7.19	3.84	6.13	4.72
Mg^#	59.5	55.7	50.9	49.5	54.5
Cr	36.9	41.4	23.1	36.3	38.6
Ni	13.8	16.8	12.9	16.6	16.0
Rb	54.4	100	71.2	98.0	57.0
Sr	537	1143	873	1164	490
Y	13.6	17.4	13.5	15.1	13.1
Zr	194	184	216	119	117
Nb	10.1	15.3	16.8	11.7	9.7
Ba	2082	2411	2079	3196	2022
La	35.8	41.4	31.2	34.6	32.5
Ce	68.6	77.8	55.7	65.9	60.1
Pr	7.86	9.29	6.23	8.11	7.29
Nd	30.5	35.6	23.4	31.1	27.8
Sm	6.86	7.87	5.56	6.73	5.74
Eu	2.19	2.54	1.89	1.90	1.50
Gd	4.34	5.26	3.41	4.55	4.12
Tb	0.57	0.68	0.48	0.63	0.57
Dy	2.70	3.41	2.45	3.28	2.87
Ho	0.50	0.62	0.48	0.55	0.49
Er	1.37	1.83	1.43	1.57	1.33
Tm	0.20	0.24	0.21	0.23	0.20
Yb	1.26	1.56	1.44	1.41	1.20
Lu	0.21	0.25	0.22	0.23	0.19
Hf	4.75	4.50	5.30	4.30	4.19
Ta	0.64	0.83	0.96	0.76	0.66
Pb	21.2	71.9	83.4	35.9	20.1
Th	11.9	12.9	16.6	11.6	10.0
Sc	15.7	23.8	9.2	15.3	10.0
Eu/Eu^*	1.15	1.14	1.23	0.99	0.90
Sr/Y	39.4	65.6	64.5	77.2	37.4
La/Yb	28.4	26.5	21.6	24.6	26.9
注：Mg^#=100×Mg/(Mg+Fe²⁺)，FeO=FeO+0.9×Fe₂O₃；Eu/Eu^*(δEu)=2×Eu_N/(Sm_N+Gd_N)，N-球粒陨石标准化值据参考文献[22]。主量元素含量单位为%，微量和稀土元素含量单位为10^-6

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云南香格里拉浪丁岩体锆石U-Pb年龄及地球化学特征

1. 外生成矿与矿山环境重庆市重点实验室/重庆地质矿产研究院, 重庆 400042 2. 煤炭资源与安全开采国家重点实验室重庆研究中心, 重庆 400042 3. 成都理工大学 地球科学学院, 四川 成都 610059

作者简介: 董毅(1987-), 男, 硕士, 高级工程师, 从事地质找矿工作。E-mail:grapedy@hotmail.com

Zircon U-Pb age and geochemical characteristics of Langding intrusion of Shangri-La, Yunnan Province

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1.
外生成矿与矿山环境重庆市重点实验室/重庆地质矿产研究院, 重庆 400042

2.
煤炭资源与安全开采国家重点实验室重庆研究中心, 重庆 400042

3.
成都理工大学地球科学学院, 四川成都 610059