扬子地块中太古宙地壳增生:来自黄陵背斜南部地区花岗闪长质片麻岩的证据

doi:10.19657/j.geoscience.1000-8527.2021.051

现代地质 ›› 2023, Vol. 37 ›› Issue (02): 433-442.DOI: 10.19657/j.geoscience.1000-8527.2021.051

扬子地块中太古宙地壳增生:来自黄陵背斜南部地区花岗闪长质片麻岩的证据

王庆¹(), 蒋幸福²^,³()

1.中煤科工集团西安研究院有限公司,陕西西安 710077
2.东华理工大学核资源与环境国家重点实验室,江西南昌 330013
3.东华理工大学地球科学学院,江西南昌 330013

收稿日期:2020-10-29 修回日期:2021-11-20 出版日期:2023-04-10 发布日期:2023-05-23
通讯作者: 蒋幸福
作者简介:蒋幸福,男,博士,讲师,1986年出生,构造地质学专业,主要从事前寒武纪大地构造学研究。Email:jiangxingfu229@163.com。
王庆,男,硕士,工程师,1986年出生,构造地质学专业,主要从事煤田地质与灾害防治、前寒武纪大地构造学研究。Email:33586158@qq.com。
基金资助:
东华理工大学核资源与环境国家重点实验室开放基金项目(NRE 1911);江西省教育厅科技项目(GJJ190375);东华理工大学博士启动基金项目(DHBK2015321)

Mesoarchean Crustal Accretion of the Yangtze Block: Evidence from the Granodioritic Gneiss in the Southern Huangling Anticline

WANG Qing¹(), JIANG Xingfu²^,³()

1. Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group, Xi’an, Shaanxi 710077, China
2. School of Earth Sciences, East China University of Technology, Nanchang, Jiangxi 330013, China
3. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, Jiangxi 330013, China

Received:2020-10-29 Revised:2021-11-20 Online:2023-04-10 Published:2023-05-23
Contact: JIANG Xingfu

摘要/Abstract

摘要：

扬子地块黄陵背斜南部出露的花岗闪长质片麻岩是太古宙TTG片麻岩的重要组成单元,具有高Al₂O₃、Na₂O、Sr以及低Rb、Nb等特征,属于高铝TTG系列,且具埃达克质岩石属性。结合片麻岩微量元素蛛网图显示的Nb、Ta和Hf等高场强元素富集以及Th、Pb和U等大离子亲石元素亏损的特征,本文认为该岩石形成于俯冲环境下玄武质洋壳的部分熔融作用。黄陵背斜北部出露的2.9~3.0 Ga TTG片麻岩和弧性质角闪岩,反映该时期是扬子地块陆壳生长的一次重要阶段,且以洋壳俯冲产生岛弧或安第斯型岩浆作用的陆壳水平增生为主,通过微陆块拼贴或规模较小的板块构造模式而形成。

关键词: 扬子地块, 黄陵背斜南部, 花岗闪长质片麻岩, 高铝TTG系列, 地壳增生

Abstract:

Granodioritic gneiss in the southern Huangling anticline of the Yangtze block is an important component of the Mesoarchean tonalite-trondhjemite-granodiorite (TTG) gneisses of the block. Geochemical results show that the granodioritic gneiss possesses high contents of Al₂O₃, Na₂O, Sr, and low values of Rb and Ta, which is classified as the high-Al TTG rock series. Moreover, geochemical features of the gneiss are consistent with adakite affinity. In combination with the enrichment of the HFSE (Nb, Ta, and Hf) and depletion of LILE (Th, Pb, and U) on the primitive mantle normalized diagrams of the granodioritic gneiss, indicating that the gneiss could be generated from partial melting of the basaltic oceanic crust during subduction process. Based on the documented 2.9-3.0 Ga TTG gneisses and arc-affinity amphibolite in the northern Huangling anticline, it is proposed that the 2.9-3.0 Ga TTG gneisses in the Huangling anticline represent an event of continental crustal growth of the Yangtze block by horizontal crustal accretion of the micro-continent or small-scale plate tectonics during the subduction process.

Key words: Yangtze block, southern Huangling anticline, granodioritic gneiss, high-Al TTG rock series, crustal growth

中图分类号:

P588.12

王庆, 蒋幸福. 扬子地块中太古宙地壳增生:来自黄陵背斜南部地区花岗闪长质片麻岩的证据[J]. 现代地质, 2023, 37(02): 433-442.

WANG Qing, JIANG Xingfu. Mesoarchean Crustal Accretion of the Yangtze Block: Evidence from the Granodioritic Gneiss in the Southern Huangling Anticline[J]. Geoscience, 2023, 37(02): 433-442.

图/表 6

图1 扬子克拉通前寒武纪构造简图((a), 据文献[18] 修编)和黄陵背斜南部地质构造略图((b), 据文献[20]修编)

Fig.1 Precambrian tectonic map of the Yangtze craton ((a), modified from reference [18]) and geological map of the Huangling anticline ((b), modified from reference [20])

图2 黄陵背斜南部花岗闪长质片麻岩野外和显微照片

Fig.2 Field and microscope photos of the granodioritic gneiss in the southern Huangling anticline

表1 扬子克拉通黄陵背斜南部花岗闪长质片麻岩主量(%)、微量和稀土元素(10-6)分析结果

Table 1 Analytical results of major elments (%), trace elements (10-6), and rare-earth elements (10-6) of the granodioritic gneiss from the southern Huangling anticline, Yangtze craton

样品名称	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
17MY-05	69.35	0.19	17.28	1.97	0.05	0.62	2.32	5.82	1.54	0.09	0.7	99.93
17MY-06	62.82	0.83	14.81	6.97	0.12	2.87	5.69	4.08	0.84	0.15	0.81	99.99
17MY-07	69.87	0.26	15.95	1.98	0.02	0.71	2.47	5.46	1.79	0.26	0.56	99.33
17MY-08	72.87	0.15	15.20	1.44	0.04	0.60	2.73	5.44	0.68	0.04	0.65	99.83
17MY-09	72.36	0.09	15.82	1.10	0.05	0.39	2.22	6.19	0.70	0.04	0.83	99.77
17MY-11	72.62	0.25	14.91	2.25	0.02	0.74	2.48	4.91	1.23	0.13	0.74	100.3
17MY-16	63.08	1.33	13.71	6.90	0.12	1.40	3.99	2.55	4.62	0.44	0.9	99.04
样品名称	Be	Sc	V	Cr	Co	Cu	Zn	Ga	Rb	Sr	Y	Zr
17MY-05	1.67	2.04	15.11	43.00	3.63	6.78	28.29	20.42	33.10	822	5.26	183
17MY-06	1.09	17.59	156.5	51.58	22.67	78.30	52.41	18.24	28.22	441	15.90	115
17MY-07	1.55	3.26	17.46	5.31	60.25	22.13	27.17	20.78	43.20	735	15.17	838
17MY-08	1.04	1.92	11.84	57.53	3.83	3.10	12.53	17.03	19.28	760	2.98	180
17MY-09	1.27	2.18	6.74	53.20	2.47	12.57	10.64	17.26	27.31	508	3.10	184
17MY-11	1.49	2.65	19.56	9.66	83.43	30.94	33.55	18.28	33.26	706	8.74	146
17MY-16	3.17	14.59	94.53	56.45	13.71	24.11	82.33	22.43	152.8	241	70.49	493
样品名称	Nb	Cs	Ba	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy
17MY-05	2.38	0.67	896	55.91	102	8.89	28.45	3.60	1.30	2.42	0.25	1.19
17MY-06	8.05	0.92	373	17.92	33	3.89	14.85	3.05	1.25	3.07	0.44	2.83
17MY-07	2.99	0.86	1420	148.2	249	24.3	78.51	10.11	2.09	6.76	0.65	2.99
17MY-08	1.46	0.84	549	52.85	78	7.37	23.10	2.72	1.09	1.60	0.15	0.69
17MY-09	0.90	0.64	331	81.23	125	11.42	35.91	3.78	1.25	2.23	0.17	0.72
17MY-11	4.08	1.45	660	51.56	84	8.15	26.31	3.71	1.31	2.69	0.32	1.67
17MY-16	31.02	1.55	1235	137.4	266	33.0	113.0	19.81	3.00	15.68	2.18	12.49
样品名称	Ho	Er	Tm	Yb	Lu	Hf	Ta	Ti	Pb	Th
17MY-05	0.19	0.65	0.07	0.45	0.08	4.41	0.08	0.28	12.70	12.05
17MY-06	0.56	1.57	0.24	1.57	0.28	2.93	0.49	0.22	7.06	2.78
17MY-07	0.54	1.90	0.23	1.61	0.29	20.62	0.58	0.32	14.63	20.44
17MY-08	0.10	0.39	0.04	0.27	0.05	4.30	0.06	0.19	9.15	8.31
17MY-09	0.11	0.47	0.04	0.34	0.06	4.37	0.04	0.25	14.25	13.01
17MY-11	0.29	0.93	0.12	0.73	0.12	3.52	1.00	0.28	12.98	7.32
17MY-16	2.34	6.71	0.92	6.10	0.93	12.33	1.81	0.79	25.21	40.39

表1 扬子克拉通黄陵背斜南部花岗闪长质片麻岩主量(%)、微量和稀土元素(10-6)分析结果

Table 1 Analytical results of major elments (%), trace elements (10-6), and rare-earth elements (10-6) of the granodioritic gneiss from the southern Huangling anticline, Yangtze craton

样品名称	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
17MY-05	69.35	0.19	17.28	1.97	0.05	0.62	2.32	5.82	1.54	0.09	0.7	99.93
17MY-06	62.82	0.83	14.81	6.97	0.12	2.87	5.69	4.08	0.84	0.15	0.81	99.99
17MY-07	69.87	0.26	15.95	1.98	0.02	0.71	2.47	5.46	1.79	0.26	0.56	99.33
17MY-08	72.87	0.15	15.20	1.44	0.04	0.60	2.73	5.44	0.68	0.04	0.65	99.83
17MY-09	72.36	0.09	15.82	1.10	0.05	0.39	2.22	6.19	0.70	0.04	0.83	99.77
17MY-11	72.62	0.25	14.91	2.25	0.02	0.74	2.48	4.91	1.23	0.13	0.74	100.3
17MY-16	63.08	1.33	13.71	6.90	0.12	1.40	3.99	2.55	4.62	0.44	0.9	99.04
样品名称	Be	Sc	V	Cr	Co	Cu	Zn	Ga	Rb	Sr	Y	Zr
17MY-05	1.67	2.04	15.11	43.00	3.63	6.78	28.29	20.42	33.10	822	5.26	183
17MY-06	1.09	17.59	156.5	51.58	22.67	78.30	52.41	18.24	28.22	441	15.90	115
17MY-07	1.55	3.26	17.46	5.31	60.25	22.13	27.17	20.78	43.20	735	15.17	838
17MY-08	1.04	1.92	11.84	57.53	3.83	3.10	12.53	17.03	19.28	760	2.98	180
17MY-09	1.27	2.18	6.74	53.20	2.47	12.57	10.64	17.26	27.31	508	3.10	184
17MY-11	1.49	2.65	19.56	9.66	83.43	30.94	33.55	18.28	33.26	706	8.74	146
17MY-16	3.17	14.59	94.53	56.45	13.71	24.11	82.33	22.43	152.8	241	70.49	493
样品名称	Nb	Cs	Ba	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy
17MY-05	2.38	0.67	896	55.91	102	8.89	28.45	3.60	1.30	2.42	0.25	1.19
17MY-06	8.05	0.92	373	17.92	33	3.89	14.85	3.05	1.25	3.07	0.44	2.83
17MY-07	2.99	0.86	1420	148.2	249	24.3	78.51	10.11	2.09	6.76	0.65	2.99
17MY-08	1.46	0.84	549	52.85	78	7.37	23.10	2.72	1.09	1.60	0.15	0.69
17MY-09	0.90	0.64	331	81.23	125	11.42	35.91	3.78	1.25	2.23	0.17	0.72
17MY-11	4.08	1.45	660	51.56	84	8.15	26.31	3.71	1.31	2.69	0.32	1.67
17MY-16	31.02	1.55	1235	137.4	266	33.0	113.0	19.81	3.00	15.68	2.18	12.49
样品名称	Ho	Er	Tm	Yb	Lu	Hf	Ta	Ti	Pb	Th
17MY-05	0.19	0.65	0.07	0.45	0.08	4.41	0.08	0.28	12.70	12.05
17MY-06	0.56	1.57	0.24	1.57	0.28	2.93	0.49	0.22	7.06	2.78
17MY-07	0.54	1.90	0.23	1.61	0.29	20.62	0.58	0.32	14.63	20.44
17MY-08	0.10	0.39	0.04	0.27	0.05	4.30	0.06	0.19	9.15	8.31
17MY-09	0.11	0.47	0.04	0.34	0.06	4.37	0.04	0.25	14.25	13.01
17MY-11	0.29	0.93	0.12	0.73	0.12	3.52	1.00	0.28	12.98	7.32
17MY-16	2.34	6.71	0.92	6.10	0.93	12.33	1.81	0.79	25.21	40.39

图3 花岗闪长质片麻岩TAS 分类命名图[25](a)和A/NK-A/CNK 图(b)

Fig.3 TAS classification[25](a) and A/NK vs. A/CNK (b) diagrams for the granodioritic gneiss in the southern Huangling anticline

图4 黄陵背斜南部花岗闪长质片麻岩稀土元素配分模式(a)和微量元素蛛网图(b)(球粒陨石和原始地幔数据据文献[26])

Fig.4 Chondrite-normalized REE distribution diagram (a) and primitive mantle-normalized trace element diagram (b) for the granodioritic gneiss in the southern Huangling anticline(normalized values from reference [26])

图5 黄陵背斜地区TTG片麻岩Al2O3-SiO2(a)和LaN/YbN-YbN(b)图解[30](黄陵背斜南部TTG样品数据来源于文献[7],黄陵背斜北部TTG样品数据来源于文献[5,7])

Fig.5 Al2O3-SiO2 diagram (a) and LaN/YbN-YbN (b) diagram[30]for the granodioritic gneiss in the southern Huangling anticline (Data of TTG gneissic samples of Huangling anticline are from references [5,7])

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扬子地块中太古宙地壳增生:来自黄陵背斜南部地区花岗闪长质片麻岩的证据

Mesoarchean Crustal Accretion of the Yangtze Block: Evidence from the Granodioritic Gneiss in the Southern Huangling Anticline

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