滇西点苍山新元古代辉长岩的识别及其大地构造意义

陈丛敏; 周云; 冯佐海; 李政林; 蔡瑾; 焦显杨; 蔡永丰

doi:10.3799/dqkx.2024.062

滇西点苍山新元古代辉长岩的识别及其大地构造意义

doi: 10.3799/dqkx.2024.062

陈丛敏^1, ,,
周云¹,
冯佐海^{1, 2},
李政林¹,
蔡瑾¹,
焦显杨¹,
蔡永丰^{1, 2, , ,}

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.
桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心, 广西桂林 541004

基金项目:

国家自然科学基金 42072259

国家自然科学基金 41502180

详细信息

作者简介:
陈丛敏(1997-)，女，硕士研究生，研究方向为矿物学、岩石学、矿床学.ORCID：0009-0003-8522-749X.E-mail：ccm18285364807@163.com

通讯作者:
蔡永丰，ORCID: 0000-0002-0110-1335. E-mail: caiyongfeng@glut.edu.cn

中图分类号: P543, P581, P597
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- 被引次数: 0
出版历程
- 收稿日期: 2023-10-11
- 网络出版日期: 2025-01-09
- 刊出日期: 2024-12-25

Identification of Neoproterozoic Gabbro from Diancangshan in West Yunnan and Its Geotectonic Implication

Chen Congmin^{1
,
,},
Zhou Yun¹,
Feng Zuohai^{1, 2},
Li Zhenglin¹,
Cai Jin¹,
Jiao Xianyang¹,
Cai Yongfeng^{1, 2
, ,
,}

1.
Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, China
2.
Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi, Guilin University of Technology, Guilin 541004, China

摘要

摘要: 滇西点苍山-哀牢山构造带保存有大量前寒武纪岩石学记录，为探究扬子地块西南缘前寒武纪的构造演化历史提供了理想窗口.对点苍山地区出露的辉长岩进行了元素地球化学和同位素年代学研究.研究结果显示，辉长岩的侵入年龄为771~769 Ma，表明点苍山地区发育新元古代基性岩浆活动.点苍山辉长岩的全碱(K₂O+Na₂O)含量变化介于4.40%~4.49%，Na₂O/K₂O值为2.30~2.34，属于钙碱性系列；具有较高的Fe₂O₃^t(7.36%~7.50%)、MgO(7.15%~7.30%)和Mg^#(69.46~69.52)，相对富集大离子亲石元素Rb、Ba、Sr，亏损Nb、Ta、Ti等高场强元素.样品相对富集轻稀土，轻重稀土元素分馏明显，Eu显示轻微正异常(Eu/Eu^*=1.17~1.29)，具有较高的锆石ε_Hf(t)值(6.72~10.84).综合有关数据资料表明，辉长岩形成于弧后盆地环境，来源于受俯冲带流体交代地幔楔橄榄岩的部分熔融.新元古代时期，扬子地块西南缘发育弧-盆体系，这一时期华南大陆的古地理位置处于Rodinia超大陆的边缘.
- 锆石U-Pb年龄 /
- 辉长岩 /
- 板块俯冲 /
- 新元古代 /
- 点苍山 /
- 岩石学 /
- 地球化学
Abstract: The Diancangshan-Ailaoshan tectonic belt in the West Yunnan has developed numerous Precambrian rocks and thus provides an ideal window for revealing the Precambrian tectonic history of the southwestern margin of the Yangtze block. In this study, elemental geochemistry and isotopic geochronology of gabbro in the Diancangshan area are presented. The results show that the intrusion age of the gabbro is 771-769 Ma, indicating that Neoproterozoic mafic magmatic activity developed in the Diancangshan area. The gabbro of the Diancangshan area exhibits a variation in total alkali content (K₂O+Na₂O) of 4.40%-4.49%, with low Na₂O/K₂O ratios (2.30-2.34), and thus belongs to the calc-alkaline series. The samples have relatively high contents of Fe₂O₃^t (7.36%-7.50%), MgO (7.15%-7.30%), and Mg^# (69.46-69.52). They are characterized by enrichment in large ion lithophile elements (LILE) such as Rb, Ba, and Sr, and depletion in high field strength elements (HFSE) such as Nb, Ta, and Ti. The samples display a relative enrichment of light rare earth elements with a pronounced fractionation between light and heavy rare earth elements, and have slightly positive anomalies of Eu (Eu/Eu^*=1.17-1.29), They have depleted zircon Hf isotopic compositions with positive ε_Hf(t) values of 6.72-10.84.Comprehensive data show that the gabbro formed in back-arc basin environment and is the product of partial melting of mantle wedge peridotite that was metasomated by subducted fluid. During the Neoproterozoic, arc-basin system was developed at the southwestern Yangtze Block, and the South China located at the margin of the Rodinia Supercontinent during this period.
- zircon U-Pb geochronology /
- gabbro /
- plate subduction /
- Neoproterozoic /
- Diancangshan /
- petrology /
- geochemistry

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图 1 扬子地块周缘新元古代岩浆岩分布地质简图

Fig. 1. Simplified geotectonic map showing the distribution of Neoproterozoic magmatic rocks of the Yangtze block and its surrounding areas

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图 2 点苍山-哀牢山构造带(a)及点苍山地区地质简图(b)

Fig. 2. Simplified geological maps of the Diancangshan⁃Ailaoshan tectonic belt (a) and Diancangshan area (b)

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图 3 点苍山辉长岩野外照片(a)、手标本照片(b)和显微照片(c, d)

Fig. 3. Field photo (a), hand specimens (b), and photomicrographs (c, d) of the gabbro from the Diancangshan area

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图 4 点苍山辉长岩锆石U⁃Pb年龄谐和图及其代表性锆石阴极发光图像

Fig. 4. Zircon U⁃Pb concordia diagrams and representative CL images for the gabbro from the Diancangshan area

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图 5 点苍山辉长岩TAS图解(a)和SiO₂⁃K₂O图解(b)

Fig. 5. Plots of TAS (a) and SiO₂⁃K₂O (b) of the gabbro from the Diancangshan area

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图 6 点苍山辉长岩原始地幔标准化微量元素蛛网图(a)和球粒陨石标准化稀土配分模式图(b)

Fig. 6. Primitive mantle⁃normalized trace element spidergrams (a) and chondrite⁃normalized REE patterns (b) of the gabbro from the Diancangshan area

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图 7 点苍山辉长岩Nb/La⁃La/Sm(a)和Nb/La⁃Sm/Nd(b)图解

Fig. 7. Plots of Nb/La⁃La/Sm (a) and Nb/La⁃Sm/Nd (b) for the gabbro in the Diancangshan area

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图 8 点苍山辉长岩La/Yb⁃Sm/Yb(a)和Sm/Yb⁃La/Sm(b)图解

Fig. 8. Plots of La/Yb⁃Sm/Yb (a) and Sm/Yb⁃La/Sm (b) of the gabbro in the Diancangshan area

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图 9 点苍山辉长岩Th/Zr ⁃Nb/Zr(a)和Th/Yb ⁃Ba/La (b)图解

Fig. 9. Plots of Th/Zr -Nb/Zr (a) and Th/Yb ⁃Ba/La (b) for the gabbro in the Diancangshan area

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图 10 点苍山辉长岩Th⁃Hf⁃Nb(a)和Ti⁃V(b)图解

Fig. 10. Plots of Th⁃Hf⁃Nb(a) and Ti⁃V(b) for the gabbro in the Diancangshan area

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图 11 Rodinia超大陆新元古代古地理格局重建图(据Xu et al., 2022修改)

Fig. 11. Neoproterozoic paleogeographic reconstruction of the Rodina Supercontinent (modified from Xu et al., 2022)

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表 1 点苍山辉长岩锆石U⁃Pb同位素测试结果

Table 1. Zircon U⁃Pb isotopic analyses results of the gabbro from the Diancangshan area

点号	元素(10^-6)		Th/U	同位素比值						年龄(Ma)
点号	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ
样品16MH37A
01	234	250	0.94	0.064 6	0.001 8	1.125 0	0.030 8	0.126 9	0.001 5	761	59	765	15	770	9
02	149	209	0.71	0.064 1	0.001 8	1.118 5	0.031 9	0.126 7	0.001 3	744	258	762	15	769	7
03	216	208	1.04	0.063 2	0.003 0	1.112 8	0.057 6	0.127 5	0.002 1	722	102	760	28	774	12
04	213	399	0.53	0.063 6	0.001 4	1.114 6	0.025 3	0.127 0	0.001 1	729	46	760	12	771	6
05	161	278	0.58	0.064 5	0.007 1	1.122 0	0.120 2	0.126 2	0.001 9	761	233	764	58	766	11
06	283	433	0.65	0.065 3	0.001 1	1.145 2	0.020 9	0.127 4	0.001 2	783	35	775	10	773	7
07	1 464	1 086	1.35	0.063 7	0.001 9	1.097 3	0.032 4	0.124 9	0.001 0	731	63	752	16	759	6
08	436	439	0.99	0.064 7	0.002 0	1.129 7	0.031 7	0.127 0	0.001 2	765	65	768	15	771	7
09	96	110	0.87	0.065 5	0.001 9	1.130 2	0.032 4	0.126 8	0.001 5	791	59	768	15	769	9
10	777	796	0.98	0.066 3	0.001 3	1.160 6	0.033 0	0.126 5	0.002 4	817	41	782	16	768	14
11	299	395	0.76	0.066 2	0.001 2	1.162 4	0.022 8	0.127 2	0.000 9	813	38	783	11	772	5
12	256	418	0.61	0.064 4	0.001 3	1.123 7	0.021 0	0.126 7	0.000 8	767	38	765	10	769	5
13	67	127	0.52	0.062 3	0.006 9	1.072 4	0.104 8	0.127 2	0.003 6	683	239	740	51	772	20
14	214	426	0.50	0.064 9	0.002 8	1.134 9	0.044 8	0.127 1	0.001 7	772	91	770	21	771	9
15	405	720	0.56	0.064 9	0.001 8	1.136 5	0.031 9	0.126 9	0.001 5	772	55	771	15	770	9
16	179	192	0.93	0.063 6	0.002 2	1.109 5	0.040 9	0.126 8	0.002 1	728	73	758	20	769	12
17	295	313	0.94	0.067 3	0.002 2	1.174 8	0.038 2	0.127 0	0.001 6	856	73	789	18	771	9
18	84	121	0.69	0.062 9	0.003 8	1.093 6	0.065 9	0.127 0	0.002 6	702	130	750	32	770	15
19	120	142	0.84	0.062 0	0.002 7	1.070 6	0.045 3	0.126 7	0.002 1	672	94	739	22	769	12
20	57	106	0.54	0.061 5	0.004 0	1.065 9	0.067 3	0.126 8	0.003 0	657	132	737	33	770	17
样品16MH37B
01	385	312	1.23	0.067 4	0.002 5	1.076 4	0.029 3	0.126 7	0.001 8	850	78	742	14	769	10
02	49	73	0.67	0.065 0	0.003 5	1.107 8	0.045 1	0.127 8	0.001 5	776	114	757	22	776	8
03	37	50	0.75	0.064 7	0.004 9	1.113 8	0.065 1	0.128 1	0.002 2	765	159	760	31	777	13
04	270	199	1.36	0.069 7	0.002 3	1.144 2	0.030 5	0.125 9	0.001 2	920	69	775	14	764	7
05	607	365	1.66	0.066 9	0.002 1	1.115 3	0.030 9	0.126 1	0.001 4	835	67	761	15	765	8
06	86	111	0.78	0.060 9	0.003 7	1.118 2	0.037 1	0.126 6	0.001 6	635	134	762	18	768	9
07	68	111	0.62	0.062 6	0.003 0	1.096 3	0.042 0	0.130 0	0.001 7	694	104	752	20	788	10
08	49	64	0.77	0.065 2	0.004 8	1.122 6	0.065 2	0.126 3	0.002 0	789	156	764	31	767	11
09	74	175	0.43	0.069 1	0.008 6	1.145 0	0.060 6	0.124 8	0.002 6	902	259	775	29	758	15
10	86	77	1.11	0.060 7	0.005 4	1.085 3	0.063 6	0.129 3	0.002 4	628	188	746	31	784	13
11	205	154	1.33	0.063 4	0.004 5	1.133 5	0.037 2	0.126 4	0.001 7	724	150	769	18	768	10
12	142	134	1.06	0.068 1	0.002 8	1.127 5	0.035 3	0.128 1	0.001 4	872	92	767	17	777	8
13	58	103	0.56	0.066 2	0.003 4	1.110 7	0.040 8	0.127 5	0.001 4	813	107	759	20	774	8
14	106	146	0.73	0.067 7	0.003 8	1.097 1	0.044 9	0.127 0	0.001 5	859	117	752	22	771	9
15	121	113	1.08	0.067 5	0.004 0	1.096 1	0.047 9	0.127 5	0.001 3	854	124	751	23	774	7
16	187	150	1.25	0.062 8	0.004 4	1.071 0	0.046 2	0.127 2	0.001 3	702	155	739	23	772	7
17	242	180	1.35	0.065 1	0.003 6	1.083 7	0.044 2	0.130 1	0.001 3	776	115	745	22	789	8
18	81	96	0.85	0.061 9	0.003 7	1.083 3	0.040 5	0.128 7	0.001 5	733	97	745	20	780	9
19	333	253	1.32	0.066 7	0.002 7	1.100 7	0.034 5	0.127 1	0.001 5	828	83	754	17	771	8
20	119	125	0.96	0.068 9	0.007 9	1.170 0	0.042 1	0.126 0	0.003 3	898	239	787	20	765	19

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表 2 点苍山辉长岩锆石Hf同位素测试结果

Table 2. Zircon Hf isotopic analyses results of the gabbro from the Diancangshan area

分析点	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2α	(¹⁷⁶Hf/¹⁷⁷Hf)_i	年龄(Ma)	ε_Hf(t)	T_DMHf2(Ma)
01	0.018 905	0.000 847	0.282 610	0.000 018	0.282 598	770	10.84	944
02	0.023 133	0.001 037	0.282 498	0.000 022	0.282 483	768	6.72	1 148
03	0.013 724	0.000 619	0.282 577	0.000 019	0.282 568	761	9.59	999
04	0.021 500	0.001 081	0.282 564	0.000 018	0.282 549	762	8.92	1 033
05	0.018 658	0.000 889	0.282 565	0.000 021	0.282 552	757	8.94	1 028
06	0.022 564	0.001 137	0.282 567	0.000 027	0.282 550	786	9.49	1 025
07	0.050 668	0.002 172	0.282 567	0.000 017	0.282 536	769	8.62	1 054
08	0.036 675	0.001 507	0.282 577	0.000 020	0.282 555	786	9.67	1 016
09	0.023 825	0.001 008	0.282 587	0.000 018	0.282 572	786	10.27	986
10	0.024 894	0.001 173	0.282 564	0.000 021	0.282 547	781	9.29	1 031

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表 3 点苍山辉长岩主量(%)和微量(10^-6)元素测试结果

Table 3. Analytical results of major (%) and trace elements (10^-6) of the gabbro from the Diancangshan area

样品号	16MH37A	16MH37B	16MH37C	16MH37D	16MH37E
SiO₂	50.21	49.75	50.15	50.46	50.46
TiO₂	0.83	0.81	0.81	0.82	0.82
Al₂O₃	18.68	18.24	18.45	18.50	18.50
Fe₂O₃^T	7.50	7.36	7.40	7.45	7.44
MgO	7.32	7.15	7.24	7.29	7.27
CaO	8.81	8.65	8.74	8.76	8.74
K₂O	1.35	1.33	1.34	1.34	1.35
Na₂O	3.14	3.07	3.12	3.13	3.11
MnO	0.15	0.14	0.15	0.14	0.14
P₂O₅	0.03	0.03	0.03	0.03	0.03
烧失量	2.53	2.57	2.50	2.51	2.53
总量	100.55	99.10	99.93	100.43	100.39
Mg^#	69.46	69.36	69.51	69.52	69.49
La	8.20	8.40	8.30	8.00	8.00
Ce	17.50	18.30	17.80	17.60	17.40
Pr	2.44	2.39	2.38	2.38	2.40
Nd	10.30	10.50	10.50	10.20	10.20
Sm	2.47	2.54	2.53	2.53	2.49
Eu	1.12	1.05	1.08	1.10	1.05
Gd	2.86	2.94	2.73	2.70	2.79
Tb	0.44	0.45	0.46	0.44	0.47
Dy	2.92	2.84	2.91	2.96	2.82
Ho	0.57	0.59	0.61	0.55	0.56
Er	1.59	1.58	1.69	1.65	1.63
Tm	0.24	0.24	0.24	0.25	0.25
Yb	1.54	1.51	1.51	1.45	1.57
Lu	0.23	0.24	0.24	0.23	0.22
V	160	156	186	178	163
Cr	360	370	360	370	360
Ni	78.58	78.58	78.58	78.58	78.58
Ga	17.60	18.30	17.70	17.80	17.60
Rb	33.40	34.30	34.00	34.40	33.50
Sr	379	387	383	386	377
Y	17.00	17.30	17.30	17.30	17.00
Zr	124	128	125	123	118
Nb	3.40	3.50	3.50	3.40	3.50
Cs	1.22	1.26	1.33	1.24	1.24
Ba	320	326	326	323	322
Hf	3.30	3.40	3.20	3.30	2.90
Ta	0.30	0.30	0.30	0.20	0.30
Th	0.37	0.37	0.35	0.37	0.37
U	0.12	0.11	0.10	0.14	0.12
∑REE	52.42	53.57	52.98	52.04	51.85
LREE	40.91	42.13	41.51	40.71	40.49
MREE	7.34	7.28	7.18	7.20	7.13
HREE	4.17	4.16	4.29	4.13	4.23
LREE/HREE	9.81	10.13	9.68	9.86	9.57
LREE/MREE	5.57	5.79	5.78	5.65	5.68
MREE/HREE	1.76	1.75	1.67	1.74	1.69
(La/Yb)_N	3.59	3.75	3.71	3.72	3.44
(La/Sm)_N	2.09	2.08	2.06	1.99	2.02
(Gd/Yb)_N	1.50	1.57	1.46	1.50	1.43
Eu/Eu*	1.29	1.17	1.25	1.28	1.21

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滇西点苍山新元古代辉长岩的识别及其大地构造意义

doi: 10.3799/dqkx.2024.062

作者简介:
陈丛敏(1997-)，女，硕士研究生，研究方向为矿物学、岩石学、矿床学.ORCID：0009-0003-8522-749X.E-mail：ccm18285364807@163.com

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蔡永丰，ORCID: 0000-0002-0110-1335. E-mail: caiyongfeng@glut.edu.cn

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Identification of Neoproterozoic Gabbro from Diancangshan in West Yunnan and Its Geotectonic Implication

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留言板

滇西点苍山新元古代辉长岩的识别及其大地构造意义

doi: 10.3799/dqkx.2024.062

作者简介: 陈丛敏(1997-)，女，硕士研究生，研究方向为矿物学、岩石学、矿床学.ORCID：0009-0003-8522-749X.E-mail：ccm18285364807@163.com

通讯作者: 蔡永丰，ORCID: 0000-0002-0110-1335. E-mail: caiyongfeng@glut.edu.cn

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Identification of Neoproterozoic Gabbro from Diancangshan in West Yunnan and Its Geotectonic Implication

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出版历程

目录

作者简介:
陈丛敏(1997-)，女，硕士研究生，研究方向为矿物学、岩石学、矿床学.ORCID：0009-0003-8522-749X.E-mail：ccm18285364807@163.com

通讯作者:
蔡永丰，ORCID: 0000-0002-0110-1335. E-mail: caiyongfeng@glut.edu.cn