西藏阿索地区目思旦角凝灰熔岩形成时代、岩浆成因及构造背景

李航; 王明; 曾孝文; 曾先进; 申迪

西藏阿索地区目思旦角凝灰熔岩形成时代、岩浆成因及构造背景

1.
吉林大学地球科学学院, 吉林长春 130061

2.
自然资源部东北亚矿产资源评价重点实验室, 吉林长春 130061

基金项目:
中国博士后科学基金第九批特别资助项目《藏北羌塘南部晚古生代基性岩墙群的成因及构造意义研究》（编号：2016T90248）、青年科学基金项目《青藏高原羌塘南部埃迪卡拉纪地层研究》（批准号：41602230）、中国地质调查局项目《西藏尼玛县尼则等三幅区域地质调查》（班公湖-怒江成矿带铜多金属矿产资源基地调查）（编号：DD20160026）、自然资源部东北亚矿产资源评价重点实验室自主基金（编号：DBY-ZZ-18-11）

详细信息

作者简介: 李航(1995-), 男, 在读博士生, 构造地质学专业。E-mail: lhycyc0924@qq.com

通讯作者: 王明(1984-), 男, 副教授, 硕士生导师, 从事青藏高原大地构造与区域地质研究。E-mail: wm609@163.com

中图分类号: P534.53;P597⁺.3

收稿日期: 2020-11-30

修回日期: 2021-04-12

刊出日期: 2021-08-15

Geochronology, magmatic genesis and tectonic setting of the Musidanjiao tufflava in the Asa area, Tibet

1.
College of Earth Science, Jilin University, Changchun 130061, Jilin, China

2.
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun 130061, Jilin, China

More Information

Corresponding author: WANG Ming, wm609@163.com

Received Date: 30 November 2020

Revised Date: 12 April 2021

Publish Date: 15 August 2021

摘要

摘要:
为了进一步探讨西藏中部阿索地区的白垩纪岩浆活动演化历史，于阿索南部的目思旦角附近采集了一期早白垩世流纹质岩屑晶屑凝灰熔岩样品，对其进行了年代学及全岩地球化学测试。测得目思旦角凝灰熔岩中锆石²⁰⁶Pb/²³⁸U年龄加权平均值为129.3±1.9 Ma（n=17，MSWD=0.039）。地球化学测试结果表明，凝灰熔岩具有极高的SiO₂（76.27%~78.70%）含量，中等的Al₂O₃（11.23%~12.21%）及全碱（5.60%~6.30%）含量，很低的全铁（1.16~1.50%）、CaO（0.62%~1.40%）、MgO（0.19%~0.24%）、TiO₂（0.09%~0.15%）和P₂O₅（0.02%~0.02%）含量；且它们表现出富集U、Th、Pb等大离子亲石元素，亏损Nb、Ta、Ti等高场强元素，并具有富集的轻稀土元素，平缓的重稀土元素，以及明显的负Eu异常。这些特征与陆缘弧地区发育的典型I型花岗质岩石的地球化学属性相似，指示它们的源区可能为部分熔融的中地壳，并在后期经历了显著的结晶分异作用。结合阿索地区已报道的120 Ma左右的陆缘岛弧岩浆活动，以及105 Ma左右的伸展型岩浆活动，认为阿索地区130 Ma左右的早白垩世流纹质岩屑晶屑凝灰熔岩可能形成于班公湖-怒江洋南向俯冲的构造背景。
- 西藏阿索 /
- 凝灰熔岩 /
- 班公湖-怒江洋 /
- LA-ICP-MS锆石U-Pb定年
Abstract:
In order to further explore the evolution history of Cretaceous magmatism in the Asa area, central Tibet, samples were collected from Early Cretaceous rhyolitic tufflava near Musidanjiao, south of the Asa area, to carry out the geochronological and geochemical studies.The mean zircon ²⁰⁶Pb/²³⁸U age of Musidanjiao tufflava yields 129.3±1.9 Ma(n=17, mswd=0.039).The geochemical test results show that the tufflava has extremely high SiO₂ content(76.27%~78.70%), moderate Al₂O₃(11.23~12.21%), total alkali content of 5.60%~6.30%, very low total iron(1.16%~1.50%), CaO(0.62%~1.40%), MgO(0.19%~0.24%), TiO₂(0.09%~0.15%), and P₂O₅(0.02%~0.02%) contents.Moreover, they show enrichment of large ion lithophile elements such as U, Th and Pb, and depletion of high field strength elements such as Nb, Ta and Ti, as well as enrichment of LREE, flat HREE and obvious negative Eu anomaly.These characteristics indicate that they might be originated from the partial melting of middle crust and experienced significant crystallization differentiation in the later period, which is geochemically similar to the typical Ⅰ-type granitoids developed in the continental margin arc region.In combination with the reported continental margin island arc magmatism of~120 Ma and the extensional magmatism of~105 Ma in the Asa area, it is suggested that the Early Cretaceous rhyolitic taffflava magmatism of~130 Ma in the Asa area might be formed in the background of the southward subduction of Bangong-Nujiang Ocean.
- Asa, Tibet /
- tufflava /
- Bangong-Nujiang Ocean /
- LA-ICP-MS zircon U-Pb dating

HTML全文

图 1 青藏高原白垩纪岩浆岩及火山沉积地层分布图(a)和目思旦角地区地质简图(b)

Figure 1.

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图图版Ⅰ

Figure 图版Ⅰ.

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图 2 目思旦角凝灰熔岩锆石阴极发光图像及锆石U-Pb谐和图

Figure 2.

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图 3 Nb/Y -Zr/TiO₂×0.0001(a)^[33]和A/CNK-A/NK(b)^[34]图解

Figure 3.

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图 4 目思旦角凝灰熔岩SiO₂-K₂O图解^[35]

Figure 4.

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图 5 阿索目思旦角凝灰熔岩原始地幔标准化微量元素蛛网图(a)及球粒陨石标准化稀土元素配分曲线(b)(标准化数据据参考文献[36])

Figure 5.

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图 6 目思旦角凝灰熔岩Sr-Ba图解^[37]

Figure 6.

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图 7 (Zr+Nb+Ce+Y)-TFeO/MgO(a)^[38]和10000Ga/Al-Zr(b)图解^[38]

Figure 7.

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图 8 Nb/Y-Rb/Y(a)和Ce-Ce/Pb(b)图解(底图据参考文献[40])

Figure 8.

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图 9 目思旦角凝灰熔岩主量元素哈克图解

Figure 9.

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图 10 花岗质岩石构造判别图解^[50]

Figure 10.

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表 1 目思旦角凝灰熔岩锆石U-Th-Pb同位素测试结果

Table 1. Zircon U-Th-Pb isotopic results of the tafflava in the Musidanjiao area

样品号	Th	U	Th/U	同位素比值						年龄/Ma
样品号	10^-6		Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
N18T24-01	225.23	163.29	1.38	0.04858	0.00281	0.13480	0.00787	0.02012	0.00057	128	82	128	7	128	4
N18T24-02	162.70	186.65	0.87	0.04863	0.00277	0.13459	0.00773	0.02007	0.00057	130	80	128	7	128	4
N18T24-03	55.68	60.26	0.92	0.09924	0.00234	3.89205	0.10789	0.28442	0.00729	1610	23	1612	22	1614	37
N18T24-04	49.74	58.11	0.86	0.06269	0.00217	0.98030	0.03628	0.11340	0.00300	698	38	694	19	692	17
N18T24-05	98.22	164.31	0.60	0.04866	0.00255	0.13657	0.00730	0.02035	0.00056	131	74	130	7	130	4
N18T24-06	203.23	381.06	0.53	0.04864	0.00199	0.13593	0.00581	0.02027	0.00054	131	53	129	5	129	3
N18T24-07	209.48	173.34	1.21	0.04866	0.00244	0.13559	0.00692	0.02021	0.00056	131	69	129	6	129	4
N18T24-08	162.93	68.03	2.39	0.08617	0.00212	2.80527	0.08012	0.23611	0.00608	1342	25	1357	21	1366	32
N18T24-09	123.64	156.61	0.79	0.04871	0.00273	0.13734	0.00781	0.02045	0.00057	134	80	131	7	130	4
N18T24-10	430.89	367.56	1.17	0.04868	0.00231	0.13604	0.00661	0.02027	0.00056	132	64	130	6	129	4
N18T24-11	152.43	155.03	0.98	0.04858	0.00304	0.13564	0.00846	0.02025	0.00061	128	87	129	8	129	4
N18T24-12	561.22	189.79	2.96	0.04851	0.00398	0.13545	0.01102	0.02025	0.00064	124	124	129	10	129	4
N18T24-13	395.75	280.90	1.41	0.04865	0.00333	0.13597	0.00939	0.02027	0.00058	131	103	129	8	129	4
N18T24-14	213.49	216.95	0.98	0.04877	0.00418	0.13830	0.01188	0.02057	0.00060	137	138	132	11	131	4
N18T24-15	95.15	105.81	0.90	0.04846	0.00505	0.13584	0.01417	0.02033	0.00060	122	178	129	13	130	4
N18T24-16	155.57	168.78	0.92	0.04861	0.00271	0.13573	0.00765	0.02025	0.00058	129	78	129	7	129	4
N18T24-17	99.11	175.82	0.56	0.04875	0.00426	0.13618	0.01196	0.02026	0.00058	136	143	130	11	129	4
N18T24-18	139.47	177.64	0.79	0.04852	0.00267	0.13676	0.00762	0.02044	0.00058	125	77	130	7	130	4
N18T24-19	117.77	117.44	1.00	0.04861	0.00512	0.13636	0.01434	0.02034	0.00062	129	178	130	13	130	4
N18T24-20	41.52	156.85	0.26	0.04374	0.00240	0.12318	0.00688	0.02042	0.00057	-84	71	118	6	130	4

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表 2 目思旦角凝灰熔岩全岩主量、微量和稀土元素含量

Table 2. Whole-rock major, trace elements and REE contents of the tafflava in the Musidanjiao area

元素	T24H1	T24H2	T24H3	NT24H4	T24H5	元素	T24H1	T24H2	T24H3	NT24H4	T24H5
SiO₂	77.13	76.72	78.70	76.27	76.81	Ce	39.3	35.7	47.8	45.4	52.4
Al₂O₃	12.21	11.84	11.23	11.92	11.99	Pr	5.15	4.83	6.25	6.03	6.89
TFe₂O₃	1.16	1.31	1.45	1.50	1.26	Nd	19.7	18.4	23.8	22.6	26.1
CaO	0.89	1.21	0.62	1.40	1.09	Sm	5.13	4.73	6.13	5.24	6.02
MgO	0.21	0.19	0.20	0.22	0.24	Eu	0.73	0.68	0.85	0.79	0.87
K₂O	3.26	2.73	2.82	3.26	3.12	Gd	5.45	5.37	7.45	5.91	6.09
Na₂O	3.04	3.33	2.78	2.48	2.74	Tb	0.93	0.92	1.32	1.01	0.95
TiO₂	0.09	0.09	0.10	0.13	0.15	Dy	5.95	6.01	8.68	6.35	5.86
P₂O₅	0.02	0.02	0.02	0.02	0.02	Ho	1.28	1.28	1.84	1.36	1.22
MnO	0.03	0.03	0.04	0.04	0.04	Er	3.80	3.89	5.44	4.03	3.56
烧失量	1.90	2.16	1.84	2.39	2.11	Tm	0.58	0.56	0.79	0.59	0.53
Cr	4.38	4.19	3.72	4.33	4.58	Yb	3.76	3.67	5.15	3.86	3.40
Ni	1.26	1.49	1.69	1.69	1.66	Lu	0.56	0.56	0.76	0.60	0.51
Ga	13.5	12.8	12.2	13.6	14.1	Hf	4.17	4.35	4.18	4.51	4.17
Rb	115	96.4	103	114	117	Ta	0.95	0.95	0.92	0.91	0.88
Sr	51.6	54.2	33.9	59.0	48.6	Pb	26.8	24.7	26.4	22.7	22.2
Y	32.9	34.4	49.4	36.8	32.6	Th	16.4	16.0	18.2	15.9	18.6
Zr	107	111	112	122	117	U	2.76	2.46	3.37	2.40	2.81
Nb	12.0	12.2	11.5	11.5	11.9	Mg^#	29.7	25.3	24.3	25.5	30.7
Ba	722	526	572	737	585	Eu/Eu^*	0.42	0.41	0.38	0.44	0.44
La	18.7	18.1	23.5	24.4	27.3	Eu/Eu^*	0.42	0.41	0.38	0.44	0.44
注：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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