滇西澜沧江构造带景谷地区团梁子岩组的时代与构造属性

王冬兵; 罗亮; 王保弟; 唐渊; 王立全; 尹福光

doi:10.3799/dqkx.2018.274

滇西澜沧江构造带景谷地区团梁子岩组的时代与构造属性

doi: 10.3799/dqkx.2018.274

中国地质调查局成都地质调查中心, 四川成都 610081

基金项目:

中国地质调查局项目 DD20160016

国家自然科学基金项目 41302170

国家自然科学基金项目 41302157

国家重点研发计划项目 2015CB452601

详细信息

作者简介:
王冬兵(1981-), 男, 高级工程师, 主要从事西南地区基础地质矿产调查研究

中图分类号: P597
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出版历程
- 收稿日期: 2018-03-12
- 刊出日期: 2018-08-15

Timing and Tectonic Affinity of the Tuanliangzi Formation in the Lancangjiang Tectonic Belt in the Western Yunnan Province, China

Chengdu Center of China Geological Survey, Chengdu 610081, China

摘要

摘要: 前人关于南澜沧江构造带团梁子岩组的时代和构造属性有不同的认识.对景谷地区的团梁子岩组的物质组成、锆石年代学和地球化学进行了系统研究.团梁子岩组是一套强变形、弱变质的构造地层，主要由深海洋盆泥质岩和近岛弧碎屑岩构成，夹杂有洋中脊型玄武岩、硅质岩等岩块.2件变沉积岩样品的锆石U-Pb年龄结果显示其原岩时代分别不早于272±2 Ma和259±1 Ma.侵入团梁子岩组的安山玢岩锆石U-Pb年龄为244±1 Ma.团梁子岩组的变玄武岩岩块属于低钾拉斑玄武岩系列，具有典型的N-MORB地球化学特征.综合团梁子岩组的岩石组合特征和原岩性质，认为其很可能是一套晚古生代俯冲增生杂岩.团梁子岩组和南澜沧江构造带内其他洋盆相残余物质指示南澜沧江构造带是一条古特提斯结合带，代表存在于晚古生代的弧后小洋盆，而非宽阔的大洋.
- 团梁子岩组 /
- 锆石U-Pb年龄 /
- 构造属性 /
- 古特提斯 /
- 澜沧江构造带 /
- 地质年代学 /
- 地球化学
Abstract: There are always different understandings about the age and tectonic affinity of the Tuanliangzi Formation in the Lancangjiang tectonic belt.In this paper, petrological investigation, zircon U-Pb geochronology and geochemical compositions of the Tuanliangzi Formation in the Jinggu area are studied in detail in order to constrain its timing and tectonic affinity.The Tuanliangzi Formation in the Jinggu area is a set of tectonic strata overprinted by strong deformation and weak metamorphism, which is mainly composed of marine argillaceous rocks in the deep ocean and clastic rocks near island arc and is interlayered by some mid-ocean ridge basalt and chert.The minimum detrital zircon U-Pb ages obtained from two metasedimentay rocks reveal that the protolith deposition ages are younger than 272±2 Ma and 259±1 Ma, respectively.Furthermore, an andesitic porphyrite occurred as intrusion in the Tuanliangzi Formation yields a zircon concordia U-Pb age of 244±1 Ma.Metabasalts in the Tuanliangzi Formation are classified into low-K tholeiitic magma series and are characterized by the typical trace element compositions of the normal mid-ocean ridge basalt (N-MORB).Thus, we suggest that the Tuanliangzi Formation could be represented by a set of the Late Paleozoic oceanic subduction-related accretionary complex, which is similar to other relict oceanic basins in the southern Lanchangjiang tectonic belt.The southern Lanchangjiang tectonic belt can be considered as a Paleo-Tethys suture zone resulted from the closure of the small Late Paleozoic back-arc oceanic basin instead of the wide ocean.
- Tuanliangzi Formation /
- zircon U-Pb dating /
- tectonic affinity /
- Paleo-Tethys /
- Lancangjiang tectonic belt /
- geochronology /
- geochemistry

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图 1 西南三江南段构造格架简图(a)和研究区地质图(b)

图a据云南省地质矿产局，1981.1:20万景谷幅区域地质调查报告.图b据云南省地质调查院，2003.1:25万临沧、滚龙幅(国内部分)区域地质调查报告.Ⅰ₁.哀牢山结合带；Ⅰ₂.兰坪-思茅地块；Ⅰ_2-1.墨江-绿春陆缘弧；Ⅰ_2-2.兰坪-思茅盆地；Ⅰ_2-3.云县-景洪陆缘弧；Ⅰ₃.南澜沧江结合带；Ⅱ₁.昌宁-孟连结合带；Ⅱ₂.临沧-勐海增生地块；Ⅲ₁.保山-镇康地块；Ⅲ₂.潞西-瑞丽结合带；Ⅲ₃.腾冲-梁河岩浆弧

Fig. 1. Tectonic sketch of the southern segment of Sanjiang tectonic belt (a) and geological map of the study area (b)

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图 2 团梁子岩组野外露头及不同类型岩石

a.野外露头及透镜体；b.千枚岩与变玄武岩呈构造接触；c.含炭质石英脉千枚岩；d.千枚状粘土质板岩；e.绢云砂板岩；f.变玄武岩；g.千枚岩中透镜状硅质岩；h.薄层状硅质岩；i.千枚岩中变砂岩透镜体；j.侵入团梁子岩组的安山玢岩

Fig. 2. Photographs of outcrop and various rocks of the Tuanliangzi Formation

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图 3 团梁子岩组不同类型岩石的显微结构特征

a.千枚岩；b.绿泥绢云板岩；c.绢云砂板岩；d.硅质岩；e.变玄武岩；f.安山玢岩.Ser.绢云母；Qz.石英；Cpx.单斜辉石；Pl.斜长石

Fig. 3. Microstructures of various rocks of the Tuanliangzi Formation

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图 4 团梁子岩组岩石样品16WK01-1(a)和PM204-5TW1(b)典型锆石阴极发光(CL)图像

Fig. 4. Cathodoluminescence (CL) images of representative zircons from the samples 16WK01-1 (a) and PM204-5TW1 (b) from the Tuanliangzi Formation

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图 5 团梁子岩组及侵入其中的次火山岩锆石U-Pb年龄谐和图和年龄频数分布

图a为团梁子岩组绿泥绢云板岩；图b为侵入团梁子岩组中的安山玢岩；c~f为团梁子岩组绢云砂板岩

Fig. 5. Zircon U-Pb concordia diagrams and histograms for representative rocks from the Tuanliangzi Formation and related subvolcanic rock

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图 6 团梁子岩组变玄武岩地球化学图解

a.SiO₂-(NaO+K₂O)图解；b.SiO₂-K₂O图解；c.稀土元素球粒陨石标准化模式；d.微量元素原始地幔标准化蛛网图.球粒陨石和原始地幔标准化值引自McDonough and Sun (1995)

Fig. 6. Geochemical classification diagrams for metabasalts from the Tuanliangzi Formation

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图 7 团梁子岩组变玄武岩构造环境判别图解

图a据Pearce and Cann (1973)；图b据Pearce and Cann (1973)；图c据Meschede (1986)；图d据Wood (1980)

Fig. 7. Tectonic setting discrimination diagrams for metabasalts from the Tuanliangzi Formation

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表 1 团梁子岩组岩石锆石LA-ICP-MS U-Pb年龄

Table 1. 1LA-ICP-MS zircon U-Pb data of the rocks from the Tuanliangzi Formation

测点号	含量(10^-6)		Th/U	同位素比值						年龄(Ma)				谐和度(%)	备注
测点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和度(%)	备注
16WK01-1
1	105	139	0.75	0.076 6	0.004 4	0.452 1	0.026 6	0.042 6	0.000 6	379	18.6	269	4.0	66	N
2	106	189	0.56	0.055 0	0.002 8	0.322 7	0.016 0	0.043 1	0.000 6	284	12.3	272	3.9	95
3	82.0	138	0.59	0.063 8	0.003 3	0.379 2	0.019 4	0.043 5	0.000 7	326	14.3	275	4.4	82
4	416	549	0.76	0.094 3	0.004 3	0.539 1	0.023 2	0.041 7	0.000 4	438	15.3	264	2.3	50	N
5	193	417	0.46	0.052 8	0.001 7	0.314 0	0.010 5	0.042 9	0.000 4	277	8.1	271	2.7	97
6	106	270	0.39	0.054 7	0.002 2	0.323 8	0.012 7	0.043 0	0.000 5	285	9.8	271	3.1	95
7	82.5	114	0.73	0.055 2	0.003 8	0.323 6	0.021 0	0.043 8	0.000 8	285	16.1	276	5.0	97
8	165	194	0.85	0.050 2	0.002 5	0.296 0	0.014 1	0.043 2	0.000 6	263	11.0	273	3.6	96
9	77.6	146	0.53	0.051 0	0.002 6	0.298 4	0.014 4	0.042 9	0.000 6	265	11.3	271	3.7	98
10	218	175	1.25	0.051 9	0.002 2	0.306 2	0.012 8	0.043 0	0.000 6	271	10.0	272	3.4	99
11	212	242	0.87	0.058 4	0.002 4	0.346 2	0.015 2	0.042 6	0.000 5	302	11.5	269	3.1	88
12	352	484	0.73	0.052 3	0.001 7	0.313 3	0.010 9	0.043 3	0.000 5	277	8.4	273	3.0	98
13	145	357	0.41	0.055 7	0.002 3	0.332 9	0.013 0	0.043 7	0.000 6	292	9.9	276	3.7	94
14	188	234	0.80	0.055 9	0.002 9	0.333 4	0.017 6	0.042 9	0.000 6	292	13.4	271	3.8	92
15	176	395	0.45	0.061 5	0.002 2	0.376 9	0.014 3	0.043 9	0.000 5	325	10.6	277	3.1	84
16	382	617	0.62	0.063 8	0.001 8	0.388 3	0.012 0	0.043 7	0.000 5	333	8.8	276	3.2	81
17	97.8	193	0.51	0.047 5	0.002 4	0.286 5	0.013 8	0.044 1	0.000 6	256	10.9	278	3.7	91
18	418	563	0.74	0.062 2	0.002 2	0.373 9	0.011 6	0.043 8	0.000 6	323	8.6	276	3.5	84
19	274	567	0.48	0.087 6	0.003 8	0.517 3	0.022 9	0.042 3	0.000 4	423	15.3	267	2.5	54	N
20	274	402	0.68	0.078 6	0.003 7	0.480 0	0.024 9	0.043 3	0.000 5	398	17.1	273	3.2	62	N
21	41.1	83.9	0.49	0.058 8	0.003 9	0.343 4	0.021 7	0.042 8	0.000 8	300	16.4	270	5.2	89
22	188	428	0.44	0.054 5	0.001 8	0.321 4	0.010 9	0.042 6	0.000 4	283	8.4	269	2.7	94
23	91.5	152	0.60	0.056 2	0.003 0	0.327 8	0.016 5	0.042 6	0.000 7	288	12.7	269	4.2	93
PM204-5TW1
1	113	160	0.71	0.053 5	0.002 8	0.302 0	0.016 0	0.040 9	0.000 6	268	12.5	258	3.6	96
2	55.3	76.4	0.72	0.057 5	0.003 3	0.339 4	0.018 7	0.043 2	0.000 6	297	14.2	273	3.9	91
3	161	365	0.44	0.051 3	0.001 8	0.332 3	0.011 9	0.046 7	0.000 5	291	9.0	294	3.2	99
4	98.0	158	0.62	0.054 8	0.002 1	0.324 3	0.012 7	0.042 8	0.000 5	285	9.8	270	3.4	94
5	41.6	289	0.14	0.052 2	0.001 6	0.391 3	0.011 6	0.054 2	0.000 7	335	8.5	340	4.0	98
6	109	87.9	1.24	0.065 0	0.002 8	0.682 1	0.029 5	0.076 4	0.001 3	528	17.8	475	7.6	89
7	307	559	0.55	0.053 9	0.001 5	0.309 4	0.008 2	0.041 3	0.000 4	274	6.4	261	2.6	95
8	147	245	0.60	0.050 0	0.001 8	0.285 1	0.010 1	0.041 3	0.000 5	255	8.0	261	3.0	97
9	468	457	1.02	0.054 7	0.001 3	0.463 8	0.011 0	0.061 3	0.000 6	387	7.6	383	3.7	99
10	134	215	0.62	0.049 0	0.002 0	0.277 4	0.011 2	0.040 9	0.000 5	249	8.9	258	3.1	96
11	108	162	0.66	0.053 1	0.002 6	0.297 2	0.014 5	0.040 6	0.000 5	264	11.4	257	3.3	97
12	100	134	0.74	0.054 6	0.002 7	0.346 2	0.016 5	0.046 1	0.000 7	302	12.4	291	4.4	96
13	158	531	0.30	0.052 5	0.001 4	0.407 5	0.011 1	0.055 8	0.000 5	347	8.0	350	3.1	99
14	125	157	0.80	0.052 5	0.002 5	0.295 0	0.013 7	0.040 9	0.000 5	262	10.8	259	3.1	98
15	232	282	0.82	0.047 8	0.001 8	0.268 3	0.009 9	0.040 6	0.000 4	241	7.9	256	2.8	93
16	267	322	0.83	0.052 7	0.002 1	0.296 8	0.011 6	0.040 7	0.000 4	264	9.1	257	2.7	97
17	144	148	0.97	0.046 9	0.002 3	0.262 9	0.012 6	0.040 9	0.000 6	237	10.1	258	3.6	91
18	87.9	203	0.43	0.109 2	0.002 0	4.521 1	0.088 8	0.297 9	0.002 7	1735	16.4	1681	13.2	96
19	185	220	0.84	0.054 3	0.002 5	0.304 8	0.013 4	0.040 9	0.000 5	270	10.4	258	3.0	95
20	118	141	0.84	0.057 4	0.002 5	0.332 2	0.015 9	0.041 3	0.000 6	291	12.2	261	3.5	88
21	93.8	107	0.88	0.054 6	0.002 9	0.306 2	0.016 3	0.040 9	0.000 6	271	12.7	258	3.9	95
22	141	125	1.13	0.052 7	0.002 6	0.296 7	0.014 2	0.041 0	0.000 5	264	11.1	259	3.2	98
23	49.5	119	0.42	0.054 6	0.002 3	0.321 1	0.013 5	0.042 8	0.000 5	283	10.4	270	3.2	95
24	238	454	0.53	0.053 3	0.001 3	0.302 6	0.007 8	0.040 9	0.000 3	268	6.0	258	2.1	96
25	89.1	206	0.43	0.053 4	0.002 2	0.340 6	0.013 5	0.046 3	0.000 4	298	10.2	292	2.7	97
26	118	144	0.82	0.052 5	0.002 4	0.293 8	0.013 1	0.040 6	0.000 5	262	10.3	257	2.9	98
27	82.1	113	0.73	0.048 3	0.002 4	0.275 1	0.014 4	0.041 1	0.000 6	247	11.5	260	3.5	94
28	98.2	84.3	1.17	0.050 0	0.002 8	0.281 9	0.015 7	0.041 1	0.000 6	252	12.4	260	4.0	97
29	532	946	0.56	0.059 9	0.001 3	0.524 5	0.012 7	0.062 8	0.000 7	428	8.5	393	4.2	91
30	231	238	0.97	0.051 4	0.002 0	0.292 9	0.011 5	0.041 1	0.000 5	261	9.0	260	2.8	99
31	67.0	86.7	0.77	0.049 2	0.002 8	0.275 0	0.014 6	0.041 2	0.000 6	247	11.6	260	3.6	94
32	155	395	0.39	0.050 7	0.001 5	0.334 4	0.010 0	0.047 7	0.000 5	293	7.6	300	3.3	97
33	153	305	0.50	0.054 7	0.001 8	0.357 3	0.011 9	0.047 1	0.000 5	310	8.9	296	3.2	95
34	84.0	91.2	0.92	0.099 5	0.002 2	4.053 8	0.089 7	0.293 7	0.002 6	1645	18.1	1660	13.0	99
35	121	148	0.82	0.050 0	0.001 8	0.336 9	0.012 1	0.048 7	0.000 6	295	9.2	307	3.5	96
36	158	394	0.40	0.051 0	0.001 3	0.343 2	0.009 0	0.048 7	0.000 6	300	6.8	306	3.6	97
37	275	72.3	3.80	0.126 2	0.002 5	6.726 2	0.136 5	0.385 0	0.003 8	2076	18.0	2100	17.7	98
38	30.5	54.9	0.56	0.056 9	0.003 8	0.333 2	0.022 4	0.042 9	0.000 8	292	17.1	271	4.6	92
39	110	155	0.71	0.088 5	0.001 9	2.903 0	0.062 2	0.237 7	0.002 4	1383	16.2	1375	12.4	99
40	132	177	0.75	0.060 6	0.002 3	0.404 4	0.017 5	0.047 8	0.000 6	345	12.6	301	3.5	86
41	186	534	0.35	0.053 0	0.001 2	0.342 7	0.008 1	0.046 7	0.000 4	299	6.1	294	2.6	98
42	91.2	196	0.46	0.053 3	0.001 9	0.332 9	0.011 7	0.045 4	0.000 5	292	8.9	286	2.8	98
43	124	166	0.75	0.052 5	0.002 1	0.310 1	0.012 5	0.042 8	0.000 5	274	9.7	270	3.1	98
44	49.5	41.3	1.20	0.057 9	0.005 6	0.308 7	0.026 2	0.040 9	0.001 3	273	20.3	259	7.9	94
45	137	334	0.41	0.096 0	0.001 8	3.697 5	0.078 4	0.277 7	0.003 2	1571	17.0	1580	16.1	99
46	190	450	0.42	0.049 4	0.001 5	0.321 3	0.010 4	0.046 8	0.000 4	283	8.0	295	2.7	95
47	256	245	1.04	0.052 7	0.001 7	0.296 9	0.009 8	0.040 7	0.000 4	264	7.6	257	2.5	97
48	167	330	0.51	0.051 9	0.001 6	0.343 0	0.011 0	0.047 6	0.000 5	299	8.3	300	3.0	99
49	97.1	128	0.76	0.053 6	0.002 6	0.348 9	0.018 3	0.046 7	0.000 7	304	13.7	294	4.1	96
50	62.6	74.8	0.84	0.055 2	0.003 4	0.307 3	0.018 6	0.040 8	0.000 7	272	14.5	258	4.1	94
51	88.0	109	0.81	0.094 5	0.002 2	3.432 3	0.081 6	0.261 0	0.002 7	1512	18.7	1495	13.8	98
52	354	302	1.17	0.051 8	0.001 7	0.308 0	0.010 1	0.042 7	0.000 4	273	7.8	270	2.7	98
53	93.6	210	0.45	0.051 4	0.002 2	0.334 5	0.014 0	0.046 9	0.000 5	293	10.7	295	3.2	99
54	57.1	120	0.47	0.049 6	0.002 9	0.283 1	0.017 1	0.041 0	0.000 5	253	13.5	259	3.4	97
55	216	388	0.56	0.054 1	0.001 6	0.355 4	0.010 7	0.047 0	0.000 5	309	8.0	296	2.8	95
56	91.5	188	0.49	0.054 6	0.002 2	0.369 2	0.014 6	0.048 4	0.000 5	319	10.8	305	3.2	95
57	86.5	96.5	0.90	0.162 3	0.002 8	10.774 2	0.192 9	0.479 0	0.004 2	2504	16.7	2523	18.2	99
58	172	336	0.51	0.051 5	0.001 6	0.339 3	0.011 0	0.047 5	0.000 5	297	8.4	299	3.2	99
59	207	279	0.74	0.050 5	0.001 9	0.332 3	0.012 3	0.047 7	0.000 5	291	9.3	300	3.2	96
60	72.6	96.5	0.75	0.051 4	0.002 8	0.301 6	0.015 9	0.042 8	0.000 6	268	12.4	270	3.8	98
61	198	685	0.29	0.052 6	0.001 5	0.511 8	0.014 6	0.070 3	0.000 8	420	9.8	438	4.7	95
62	189	286	0.66	0.049 8	0.002 1	0.294 4	0.011 8	0.043 0	0.000 5	262	9.3	272	3.1	96
63	181	262	0.69	0.047 5	0.001 8	0.303 1	0.010 9	0.046 7	0.000 6	269	8.5	295	3.8	90
64	44.6	99.7	0.45	0.050 9	0.002 8	0.287 4	0.015 6	0.040 8	0.000 6	257	12.3	258	3.4	99
65	191	203	0.94	0.052 6	0.002 2	0.294 4	0.012 5	0.040 7	0.000 6	262	9.8	257	3.4	98
66	132	137	0.97	0.053 5	0.003 0	0.299 6	0.016 8	0.040 9	0.000 6	266	13.1	258	3.9	96
67	138	280	0.49	0.163 1	0.004 4	9.945 7	0.272 3	0.440 2	0.005 1	2430	25.3	2352	22.6	96
68	97.2	186	0.52	0.051 8	0.002 2	0.336 6	0.014 0	0.047 1	0.000 6	295	10.6	297	3.5	99
69	104	184	0.57	0.054 7	0.002 2	0.364 3	0.014 9	0.048 3	0.000 6	315	11.1	304	3.7	96
70	159	151	1.05	0.052 0	0.002 5	0.295 3	0.014 3	0.041 2	0.000 5	263	11.2	260	3.3	99
71	604	581	1.04	0.051 3	0.001 3	0.330 6	0.008 1	0.046 4	0.000 4	290	6.2	292	2.6	99
72	80.0	177	0.45	0.053 4	0.002 0	0.346 7	0.012 3	0.047 2	0.000 5	302	9.3	297	3.2	98
73	147	197	0.75	0.050 4	0.002 0	0.286 8	0.011 6	0.041 0	0.000 5	256	9.1	259	3.0	98
74	231	277	0.84	0.050 6	0.001 8	0.331 9	0.011 7	0.047 5	0.000 5	291	9.0	299	3.0	97
75	81.9	76.2	1.07	0.056 0	0.003 6	0.309 4	0.019 4	0.040 6	0.000 6	274	15.1	257	3.5	93
76	153	193	0.80	0.049 7	0.002 0	0.282 5	0.011 1	0.041 5	0.000 6	253	8.8	262	3.4	96
77	190	300	0.63	0.051 5	0.001 5	0.337 4	0.009 6	0.047 6	0.000 5	295	7.3	299	2.9	98
78	259	453	0.57	0.055 3	0.001 6	0.358 2	0.010 7	0.046 9	0.000 5	311	8.0	295	2.8	94
79	151	122	1.24	0.102 9	0.002 0	4.286 0	0.086 0	0.301 4	0.002 6	1691	16.6	1698	13.1	99
80	146	327	0.45	0.051 6	0.001 6	0.294 5	0.009 0	0.041 3	0.000 4	262	7.1	261	2.4	99
81	97.0	124	0.78	0.053 6	0.002 3	0.356 9	0.014 6	0.048 5	0.000 6	310	10.9	305	3.8	98
82	169	251	0.68	0.056 9	0.001 8	0.371 0	0.012 1	0.047 0	0.000 4	320	9.0	296	2.6	92
83	193	198	0.97	0.052 1	0.002 4	0.291 5	0.012 7	0.040 9	0.000 5	260	10.0	258	2.9	99
84	80.3	101	0.79	0.051 9	0.002 5	0.335 9	0.016 1	0.047 2	0.000 7	294	12.2	297	4.5	98
85	118	249	0.47	0.050 9	0.001 8	0.331 8	0.011 8	0.047 1	0.000 5	291	9.0	297	3.1	97
86	144	356	0.40	0.053 2	0.001 7	0.356 4	0.011 7	0.048 3	0.000 5	310	8.8	304	3.1	98
87	79.0	131	0.60	0.047 2	0.002 3	0.306 4	0.015 0	0.047 1	0.000 6	271	11.7	297	3.5	91
88	169	264	0.64	0.053 6	0.001 7	0.345 9	0.010 9	0.046 8	0.000 4	302	8.2	295	2.5	97
89	57.3	172	0.33	0.053 3	0.002 0	0.343 1	0.012 4	0.046 8	0.000 5	299	9.4	295	3.1	98
90	70.9	117	0.60	0.048 3	0.002 5	0.313 9	0.016 3	0.047 2	0.000 6	277	12.6	297	3.9	93
91	88.4	144	0.61	0.100 2	0.001 9	4.074 3	0.079 3	0.293 2	0.002 5	1 649	15.9	1 657	12.3	99
92	307	526	0.58	0.057 3	0.001 5	0.324 1	0.008 8	0.040 9	0.000 3	285	6.8	258	2.1	90
93	71.6	98.4	0.73	0.053 1	0.002 5	0.343 5	0.016 9	0.046 9	0.000 7	300	12.8	296	4.0	98
94	85.8	144	0.60	0.048 8	0.002 7	0.274 1	0.014 9	0.040 8	0.000 5	246	11.9	258	3.3	95
95	105	133	0.79	0.053 9	0.001 9	0.395 2	0.013 6	0.053 4	0.000 7	338	9.9	336	4.3	99
96	130	218	0.60	0.049 8	0.001 7	0.325 9	0.010 9	0.047 6	0.000 4	286	8.4	299	2.7	95
97	149	196	0.76	0.052 8	0.001 8	0.339 4	0.011 3	0.046 7	0.000 5	297	8.6	294	3.4	99
98	253	531	0.48	0.054 4	0.001 3	0.357 1	0.009 2	0.047 4	0.000 5	310	6.9	298	2.8	96
99	165	385	0.43	0.093 8	0.001 4	3.479 6	0.055 0	0.267 9	0.002 2	1523	12.5	1530	11.5	99
100	172	231	0.74	0.055 7	0.001 5	0.578 0	0.015 4	0.075 1	0.000 8	463	9.9	467	4.5	99
101	88.9	192	0.46	0.052 1	0.001 8	0.345 8	0.011 6	0.048 4	0.000 5	302	8.7	305	3.1	99
102	357	396	0.90	0.052 4	0.001 4	0.343 3	0.009 6	0.047 2	0.000 5	300	7.2	297	2.8	99
PM204-46b2
1	167	259	0.65	0.053 2	0.001 9	0.288 6	0.010 1	0.039 4	0.000 5	257	8.0	249	3.2	96
2	135	155	0.87	0.051 6	0.002 3	0.271 3	0.011 6	0.038 4	0.000 5	244	9.2	243	3.1	99
3	287	359	0.80	0.050 7	0.001 4	0.271 2	0.007 4	0.038 7	0.000 4	244	5.9	245	2.4	99
4	201	290	0.69	0.050 3	0.001 7	0.270 3	0.009 1	0.039 0	0.000 4	243	7.2	247	2.4	98
5	154	274	0.56	0.058 5	0.001 9	0.305 0	0.009 4	0.037 9	0.000 3	270	7.3	240	1.9	88	N
6	208	315	0.66	0.049 8	0.001 6	0.265 5	0.008 3	0.038 7	0.000 4	239	6.7	245	2.4	97
7	172	284	0.60	0.056 5	0.001 8	0.304 1	0.010 0	0.038 8	0.000 4	270	7.8	245	2.4	90
8	251	355	0.71	0.050 1	0.001 5	0.261 2	0.007 3	0.037 9	0.000 4	236	5.9	240	2.2	98
9	215	329	0.65	0.065 2	0.002 0	0.344 5	0.010 4	0.038 3	0.000 4	301	7.8	242	2.2	78	N
10	265	344	0.77	0.050 3	0.001 5	0.267 9	0.007 8	0.038 7	0.000 4	241	6.2	245	2.4	98
11	157	250	0.63	0.061 1	0.002 2	0.326 9	0.011 8	0.038 8	0.000 4	287	9.0	245	2.4	84	N
12	144	239	0.60	0.051 5	0.001 8	0.275 3	0.009 4	0.038 8	0.000 4	247	7.5	246	2.5	99
13	159	177	0.90	0.050 6	0.002 2	0.270 2	0.011 1	0.039 0	0.000 4	243	8.9	247	2.6	98
14	133	234	0.57	0.051 5	0.001 9	0.269 5	0.009 9	0.037 9	0.000 4	242	8.0	240	2.6	99
15	250	358	0.70	0.050 9	0.001 6	0.265 2	0.007 8	0.037 9	0.000 4	239	6.3	240	2.3	99
16	228	359	0.64	0.049 9	0.001 3	0.272 1	0.007 3	0.039 5	0.000 4	244	5.8	250	2.2	97
17	130	233	0.56	0.050 7	0.002 1	0.274 0	0.010 3	0.039 6	0.000 4	246	8.2	250	2.4	98
18	306	398	0.77	0.051 4	0.001 6	0.273 3	0.008 1	0.038 8	0.000 4	245	6.5	245	2.6	99
19	357	393	0.91	0.054 5	0.001 8	0.288 7	0.009 4	0.038 5	0.000 4	258	7.4	243	2.5	94
20	217	306	0.71	0.051 2	0.001 6	0.272 3	0.008 6	0.038 6	0.000 4	244	6.9	244	2.4	99
21	292	401	0.73	0.053 3	0.001 4	0.279 2	0.007 6	0.038 0	0.000 4	250	6.0	241	2.2	96
22	286	345	0.83	0.060 6	0.002 1	0.327 9	0.010 6	0.039 5	0.000 4	288	8.1	250	2.3	85	N
23	154	256	0.60	0.052 2	0.001 9	0.276 4	0.009 8	0.038 6	0.000 4	248	7.8	244	2.5	98
注：N代表不参与年龄计算.

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表 2 团梁子岩组变玄武岩主量(%)和微量元素(10^-6)组成

Table 2. Major elements (%) and trace elements (10^-6) compositions of metabasalts from the Tuanliangzi Formation

样品号	PM204-2H1	PM204-2H4	PM204-14H2	PM204-14H3	PM204-16H1	PM204-28H1	PM204-28H2	PM204-28H3	16WK02-1	16WK02-2	16WK02-3	PM203-14H1
SiO₂	45.22	48.35	47.91	47.98	45.46	48.73	43.25	45.18	49.88	48.51	48.00	47.68
TiO₂	1.79	2.01	1.51	1.68	1.11	1.60	2.36	1.81	1.79	1.75	1.70	1.84
Al₂O₃	12.95	13.93	14.35	14.06	14.81	13.88	13.75	15.61	13.98	14.21	13.85	13.49
Fe₂O₃	13.54	14.08	12.62	15.10	10.79	13.74	16.34	15.99	12.99	12.72	13.94	15.22
MnO	0.24	0.22	0.20	0.24	0.18	0.23	0.39	0.27	0.20	0.20	0.21	0.26
MgO	5.21	6.48	7.34	8.42	8.36	6.50	4.69	6.94	6.70	7.73	7.12	7.48
CaO	10.13	7.16	10.42	5.47	9.53	7.20	8.62	4.83	7.39	7.66	8.28	8.25
Na₂O	3.12	3.16	2.90	3.40	2.72	3.40	2.98	3.30	4.26	4.01	3.78	3.46
K₂O	0.04	0.06	0.30	0.31	0.03	0.13	0.16	0.28	0.09	0.04	0.03	0.05
P₂O₅	0.14	0.15	0.12	0.13	0.13	0.12	0.18	0.18	0.14	0.13	0.13	0.14
LOI	6.94	4.35	2.56	4.09	6.84	4.41	7.18	5.54	2.95	2.99	2.91	2.89
Total	99.32	99.95	100.23	100.88	99.96	99.94	99.90	99.93	100.37	99.95	99.95	100.76
Mg^#	43	48	54	52	61	48	36	46	51	55	50	49
N₂O+K₂O	3.42	3.37	3.28	3.83	2.96	3.70	3.39	3.79	4.47	4.17	3.93	3.59
N₂O/K₂O	76	49	10	11	80	26	19	12	45	115	130	67
Li	23.5	46.3	21.5	47.1	49.9	42.0	52.1	58.8	21.0	29.0	28.5	25.6
Be	0.82	0.51	0.47	0.71	0.75	0.61	0.82	0.78	0.39	0.46	0.51	0.72
Sc	42.5	47.8	45.1	43.5	37.0	46.5	48.2	53.2	50.9	50.2	48.7	43.5
V	381	407	337	373	271	386	488	434	368	396	401	403
Cr	45.9	105	158	92.7	457	122	51.5	150	60.3	64.8	59.3	24.5
Co	45.6	54.6	44.0	43.6	44.1	46.6	48.7	50.5	53.5	50.2	51.2	46.2
Ni	36.7	60.0	63.0	50.7	169	60.5	43.1	72.4	48.7	49.6	46.1	36.7
Cu	72.2	116	83.7	106	74.7	92.8	76.2	85.8	74.6	90.4	84.4	70.1
Zn	131	502	90.2	228	109	225	126	122	110	99.6	544	116
Ga	17.2	18.4	17.5	18.0	14.9	18.0	20.5	21.4	14.2	16.1	19.4	20.0
Rb	3.09	1.80	5.88	16.7	1.36	2.48	9.27	5.38	2.42	0.69	0.87	1.93
Sr	98.9	158	154	72.8	184	110	113	69.1	130	114	128	73
Y	43.0	45.6	35.3	34.6	27.4	41.6	61.0	48.5	38.5	40.1	42.0	45.4
Zr	105	115	88.1	94.2	72.8	92.9	135	106	105	99.4	96.5	108.0
Nb	2.08	2.18	1.84	1.75	2.09	1.69	2.58	1.94	2.13	1.83	1.86	2.04
Sn	1.18	1.26	0.86	1.02	0.76	0.94	1.34	0.85	1.04	1.04	0.82	1.24
Cs	1.27	1.21	0.45	4.10	2.33	1.03	8.73	1.62	0.48	0.76	1.51	0.64
Ba	75.2	27.7	18.9	17.3	24.3	38.5	371	348	67.2	27.9	26.8	31.4
La	3.85	3.88	3.02	3.65	3.42	3.85	6.98	5.82	3.21	3.01	3.20	3.77
Ce	12.2	12.7	9.83	11.2	9.88	11.4	17.3	14.2	10.9	10.3	10.8	11.7
Pr	1.97	2.11	1.62	1.83	1.52	1.90	2.91	2.34	1.83	1.73	1.78	1.95
Nd	11.2	12.0	9.3	10.1	8.4	10.6	16.5	13.1	10.4	9.9	10.2	11.3
Sm	4.09	4.37	3.46	3.48	2.94	3.94	6.02	4.85	3.83	3.85	3.97	4.16
Eu	1.67	1.77	1.46	1.44	1.22	1.65	2.24	1.85	1.50	1.46	1.48	1.70
Gd	5.86	6.36	4.95	4.87	3.95	5.56	8.85	6.91	5.34	5.27	5.59	6.17
Tb	1.14	1.23	0.94	0.98	0.72	1.05	1.56	1.23	0.98	1.00	1.03	1.20
Dy	7.07	7.70	6.01	6.26	4.55	6.91	9.94	7.91	6.72	6.76	6.88	7.63
Ho	1.66	1.73	1.35	1.36	1.01	1.47	2.17	1.73	1.42	1.48	1.50	1.72
Er	4.56	4.74	3.70	3.72	2.72	4.23	6.12	4.69	4.14	4.25	4.46	4.85
Tm	0.73	0.78	0.61	0.61	0.45	0.63	0.91	0.71	0.60	0.64	0.63	0.80
Yb	4.40	4.64	3.54	3.63	2.60	3.95	5.67	4.56	4.09	4.12	4.32	4.68
Lu	0.71	0.75	0.60	0.60	0.44	0.61	0.86	0.70	0.61	0.63	0.64	0.77
Hf	2.97	3.15	2.39	2.64	1.88	2.60	3.76	2.89	2.90	2.79	2.73	3.05
Ta	0.19	0.17	0.14	0.13	0.16	0.15	0.22	0.15	0.16	0.14	0.14	0.16
Tl	0.096	0.020	0.270	0.100	0.018	0.071	0.290	0.073	0.024	0.014	0.044	0.033
Pb	38.9	152	1.85	18.6	12.8	184	7.25	2.02	2.34	42.5	237	10
Th	0.34	0.19	0.19	0.15	0.17	0.16	0.21	0.18	0.29	0.15	0.17	0.19
U	0.16	0.29	0.06	0.08	0.08	0.06	0.13	0.05	0.11	0.05	0.06	0.10
∑REE	61.1	64.7	50.3	53.7	43.8	57.7	88.0	70.6	55.5	54.4	56.5	62.4
δEu	1.04	1.02	1.07	1.07	1.09	1.07	0.93	0.97	1.01	0.99	0.96	1.02
(La/Yb)_N	0.59	0.57	0.58	0.68	0.90	0.66	0.84	0.87	0.53	0.50	0.50	0.55
注：Mg^#=100×Mg/(Mg+Fe)(原子数)；δEu=2×Eu_N/(Sm_N+Gd_N).

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