青海省亚马托侵入岩地球化学特征及其LA-ICP-MS锆石U-Pb测年的构造意义

孙健; 孙东亮

青海省亚马托侵入岩地球化学特征及其LA-ICP-MS锆石U-Pb测年的构造意义

孙健,
孙东亮

陕西地矿第一地质队, 陕西安康 725000

基金项目:

中国地质调查局青藏地质调查工作项目 12120114018101

详细信息

作者简介:
孙健(1983-), 男, 工程师, 从事区域地质调查及矿产勘查工作.E-mail:290564897@qq.com

中图分类号: P584;P588.12
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- 被引次数: 0
出版历程
- 收稿日期: 2016-12-23
- 刊出日期: 2017-08-01

THE GEOCHEMICAL CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF LA-ICP-MS ZIRCON U-PB DATING OF YAMATUO INTRUSIVE ROCKS, QINHAI PROVINCE

The Geological Team NO.1, Shaanxi Geology and Mineral Resources, Ankang 725000, Shaanxi, China

摘要

摘要: 亚马托侵入岩位于柴达木盆地东北缘，为塔塔楞河大岩基的东段部分。岩性为似斑状正长花岗岩+斑状二长花岗岩组合，岩石中斑晶含量6%~25%，颗粒达1~5 cm，构成环斑结构。该侵入岩地球化学特征显示，Eu具明显的亏损特征，反映岩石经历了强烈的分离结晶作用，与壳源花岗岩（S型）很相似，表明这些花岗岩为地壳部分熔融的产物，属后碰撞环境的壳源岩浆岩组合。LA-ICP-MS锆石U-Pb测年结果表明岩体形成于429.9±1.4 Ma，时代为早志留世，佐证了其是早古生代造山过程结束或近于结束的标志，这一成果为进一步研究柴北缘造山带的构造演化提供了重要的年代学约束。
- 柴北缘 /
- 亚马托侵入岩 /
- 地球化学 /
- LA-ICP-MS锆石U-Pb测年
Abstract: Yamatuo intrusive rocks, distributing in the northern margin of Qaidam basin, compose the east part of Tataleng River batholith. The lithology of these rocks is the combination of porphyritic-like syenogranite and porphyritic monzogranite. The phenocryst content in the rocks is 6~25% and its grain size is 1~5 cm, revealing rapakivi texture. The geochemical characteristics show that Eu is with obvious depleted characteristics reflecting the strong fractional crystallization of rocks which is very similar to crustal-derived granite (S). All the facts indicate the intrusive rocks are the partial melting of the crust, belonging to the mixture of crust-derived magmatite in post-collisional tectonic setting. The result analysis of LA-ICP-MS zircon U-Pb dating indicates that the rock mass was formed in early Silurian 429.9±1.4 Ma, being the signature of the end or near the end of the orogenic process in early Paleozoic This finding provides important chronological constraints for further study of the tectonic evolution of the northern margin of Qaidam orogenic belt.
- northern margin of Qaidam basin /
- Yamatuo intrusive rock /
- geochemistry /
- LA-ICP-MS zircon U-Pb dating

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图 1 亚马托侵入岩位置

Figure 1. Tectonic location of Yamatuo intrusive rock

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图 2 样品采集位置分布图

Figure 2. Distribution map of the sample collection position

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图 3 亚马托侵入岩稀土元素配分模式图

Figure 3. NASC normalized REE pattern of Yamatuo intrusive rocks

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图 4 亚马托侵入岩微量元素比值蛛网图

Figure 4. Spider diagram of trace element ratio of Yamatuo intrusive rocks

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图 5 岩石中的钾长石巨斑

Figure 5. Giant potash feldspar phenocryst in the rock

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图 6 岩体中的包体及细粒边

Figure 6. Fine-grained rims and chilled borders in the rock

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图 7 亚马托侵入岩Nb-Y图解

Figure 7. Nbversus Y diagrams of Yamatuo intrusive rocks

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图 8 亚马托侵入岩Rb-Nb+Y图解

Figure 8. Rbversus Nb+Y diagrams of Yamatuo intrusive rocks

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图 9 似斑状黑云母二长花岗锆石CL图像

Figure 9. CL Images of porphyritic biotite monzogranite zircons

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图 10 亚马托侵入岩锆石U-Pb年龄谐和图

Figure 10. Zircon U-Pb concordia diagram of Yamatuo intrusive rocks

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图 11 亚马托侵入岩锆石U-Pb年龄加权图

Figure 11. Zircon U-Pb ages weighted graph of Yamatuo intrusive rocks

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表 1 亚马托侵入岩岩石稀土元素及参数特征表(w×10^-6)

Table 1. Rare-earth elements and parameter characteristics table of Yamatuo intrusive rocks

序号	岩性	样品编号	轻稀土元素								重稀土元素
序号	岩性	样品编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
1	黑云母正长花岗岩	PM12-XT1	20.0	47.9	5.49	19.8	5.28	0.23	5.98	1.11	7.56	1.52	4.74	0.70	4.61	0.63
2		PM12-XT2	19.9	45.8	5.28	19.0	5.07	0.31	5.65	1.06	6.83	1.33	4.17	0.60	4.18	0.55
3		PM12-XT3	15.8	38.6	4.44	15.6	4.10	0.17	4.67	0.88	5.68	1.10	3.45	0.53	3.57	0.50
4		PM12-XT4	17.5	36.0	4.36	15.3	4.21	0.26	4.56	0.90	5.64	1.10	3.39	0.53	3.84	0.52
5		PM12-XT5	25.0	56.8	6.96	24.7	6.36	0.33	7.01	1.24	7.97	1.55	4.78	0.68	4.59	0.61
6		PM12-XT6	27.2	59.4	7.14	25.4	6.12	0.47	6.83	1.22	7.97	1.57	4.86	0.69	4.52	0.60
7		PM12-XT7	27.8	60.5	6.82	24.5	5.58	0.51	6.06	0.94	5.42	1.05	3.11	0.43	2.83	0.38
8		PM12-XT8	30.1	63.0	7.54	27.3	6.21	0.68	6.63	1.03	5.94	1.16	3.53	0.48	2.99	0.39
9		PM12-XT9	18.1	44.1	5.34	19.5	5.67	0.15	6.26	1.22	8.08	1.52	4.86	0.71	4.70	0.65
10		PM12-XT10	30.0	62.9	7.25	25.8	5.75	0.71	6.18	0.98	5.86	1.13	3.30	0.45	2.90	0.38
11		PM12-XT11	34.4	70.4	7.97	28.6	6.10	0.86	6.95	1.02	5.85	1.09	3.31	0.45	2.81	0.36
12	黑云母二长花岗岩	PM12-XT12	38.7	80.4	9.16	32.9	7.14	0.74	7.97	1.18	6.97	1.33	3.90	0.53	3.33	0.44
13		PM12-XT13	39.4	85.1	9.54	33.6	7.20	0.73	7.87	1.15	6.63	1.24	3.81	0.51	3.30	0.44
14		PM12-XT14	39.3	80.3	9.38	33.4	7.34	0.89	8.03	1.22	7.26	1.39	4.14	0.54	3.26	0.47
15		PM12-XT15	39.3	77.3	9.25	33.4	7.20	0.97	8.28	1.27	7.40	1.43	4.18	0.54	3.23	0.44
16		PM12-XT16	64.3	133	14.4	52.3	9.56	1.35	10.4	1.31	6.82	1.23	3.57	0.48	3.00	0.42
17		PM12-XT17	58.0	120	13.3	48.1	8.70	1.30	9.81	1.24	6.52	1.27	3.54	0.47	3.01	0.43
18		PM12-XT18	64.2	134	15.1	52.6	9.60	1.14	10.7	1.32	6.75	1.21	3.51	0.45	2.83	0.38

序号	特征参数
序号	Y	∑REE	LREE		HREE	LREE/HREE		(La/Yb) _N		Sm/Nd		La/Sm	δCe		δEu
1	43.9	125.55	98.7		26.85	3.68		2.52		0.27		3.79	1.09		0.12
2	39.2	119.73	95.36		24.37	3.91		2.77		0.27		3.93	1.06		0.18
3	31.7	99.09	78.71		20.38	3.86		2.57		0.26		3.85	1.10		0.12
4	30.8	98.11	77.63		20.48	3.79		2.65		0.28		4.16	0.98		0.18
5	44.7	148.58	120.15		28.43	4.23		3.17		0.26		3.93	1.03		0.15
6	45.4	153.99	125.73		28.26	4.45		3.50		0.24		4.44	1.01		0.22
7	29.3	145.93	125.71		20.22	6.22		5.71		0.23		4.98	1.04		0.27
8	33.2	156.98	134.83		22.15	6.09		5.85		0.23		4.85	0.99		0.32
9	43.7	120.86	92.86		28	3.32		2.24		0.29		3.19	1.08		0.08
10	31.5	153.59	132.41		21.18	6.25		6.01		0.22		5.22	1.01		0.36
11	31.0	170.17	148.33		21.84	6.79		7.12		0.21		5.64	1.00		0.40
12	36.3	194.69	169.04		25.65	6.59		6.76		0.22		5.42	1.01		0.30
13	35.0	200.52	175.57		24.95	7.04		6.94		0.21		5.47	1.04		0.30
14	39.2	196.92	170.61		26.31	6.48		7.01		0.22		5.35	0.99		0.35
15	39.4	194.19	167.42		26.77	6.25		7.07		0.22		5.46	0.96		0.38
16	33.7	302.14	274.91		27.23	10.10		12.46		0.18		6.73	1.03		0.41
17	33.4	275.69	249.4		26.29	9.49		11.20		0.18		6.67	1.02		0.43
18	32.8	303.79	276.64		27.15	10.19		13.19		0.18		6.69	1.02		0.34
注：测试单位为国土资源部西安矿产资源监督检测中心

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表 2 亚马托侵入岩岩石微量元素特征表

Table 2. Trace element characteristics table of Yamatuo intrusive rocks

序号	样号	微量元素丰度(ω_B/10^-6)
序号	样号	Zr	Nb	Ba	Hf	Ta	Ni	P	Sr	Ti	Sc	Cr	Co
1	PM12-Dy1	85.7	16.6	288	8.53	1.4	1.33	289	31.6	469	4.42	15.1	1.10
2	PM12-Dy2	99.2	32.8	500	7.71	0.74	2.11	290	52.2	572	4.76	16.3	1.27
3	PM12-Dy3	107	32.2	222	6.43	1.56	2.04	341	45.8	594	4.59	16.2	1.42
4	PM12-Dy4	67	34.4	98.2	7.18	1.91	1.13	318	50.2	352	5.69	23.9	0.81
5	PM12-Dy5	86.4	18.5	135	7.45	1.38	1.28	269	33.5	474	5.35	15.7	1.11
6	PM12-Dy6	101	16.5	226	5.1	1.07	1.92	274	61.1	679	3.58	13.9	1.37
7	PM12-Dy7	91.6	21.9	184	3.7	0.89	1.26	1025	45.7	606	3.58	14.3	1.29
8	PM12-Dy8	81.1	24.7	183	4.12	0.48	1.77	259	54.4	574	4.40	63.5	1.41
9	PM12-Dy9	79.4	27.3	60.9	7.21	1.05	0.96	315	23.6	438	4.01	11.5	0.83
10	PM12-Dy10	107	46	324	3.43	1.05	1.9	289	46.6	644	2.66	17.9	1.58
11	PM12-Dy11	108	53.6	398	3	1.2	1.99	288	64.1	627	2.80	10.7	1.30
12	PM12-Dy12	141	45.8	317	3.37	0.76	2.16	356	77.7	839	3.85	18.6	1.55
13	PM12-Dy13	144	46.6	303	3.73	0.99	2.1	320	63.6	808	3.86	27.2	2.08
14	PM12-Dy14	114	15.2	356	3.46	1.27	2.51	332	79.0	768	5.38	46.8	1.68
15	PM12-Dy15	127	47.1	312	4.95	0.88	2.3	291	49.9	821	5.05	23.1	1.78
16	PM12-Dy16	203	29.6	746	2.49	1.86	5.96	462	133	1473	7.49	31.6	4.10
17	PM12-Dy17	225	23.5	744	2.25	1.26	6.86	784	105	1631	7.87	64.4	4.84
18	PM12-Dy18	130	36.3	1046	2.25	0.86	4.39	393	105	1150	6.04	12.5	3.37
维氏值(1962)		200	20	830	1	3.5	8	700	300	2300	3	25	5

序号	样号	微量元素丰度(ω_B/10^-6)										参数
序号	样号	Rb		Mo	W		V		Th	U		Rb/Sr
1	PM12-Dy1	449		4.30	2.05		8.13		27.1	4.71		14.21
2	PM12-Dy2	421		2.39	5.37		14.1		28.7	6.99		8.07
3	PM12-Dy3	401		1.39	3.38		8.76		25.6	4.19		8.76
4	PM12-Dy4	556		3.99	3.80		6.19		24.8	3.06		11.08
5	PM12-Dy5	441		2.63	3.35		6.59		27.1	5.89		13.16
6	PM12-Dy6	314		0.68	3.83		10.1		25.8	2.57		5.14
7	PM12-Dy7	355		0.90	3.54		9.78		20.4	2.05		7.77
8	PM12-Dy8	392		0.50	2.21		10.1		16.3	2.44		7.21
9	PM12-Dy9	449		0.51	4.08		4.37		21.7	5.19		19.03
10	PM12-Dy10	303		1.37	1.83		11.2		22.2	2.93		6.50
11	PM12-Dy11	275		0.87	1.13		11.5		23.2	2.09		4.29
12	PM12-Dy12	268		1.14	1.70		13.6		30.2	3.98		3.45
13	PM12-Dy13	289		1.51	2.27		13.2		30.8	1.71		4.54
14	PM12-Dy14	296		0.51	9.29		16.6		31.6	2.23		3.75
15	PM12-Dy15	292		0.72	1.82		13.4		34.3	3.80		5.85
16	PM12-Dy16	230		1.33	1.43		28.8		35.7	2.64		1.73
17	PM12-Dy17	228		0.56	1.23		30.0		37.9	2.63		2.17
18	PM12-Dy18	220		1.44	1.82		23.3		27.6	1.39		2.10
维氏值(1962)		200		1	1.5		40		18	3.5
注：测试单位为国土资源部西安矿产资源监督检测中心

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表 3 黑云母二长花岗岩体锆石U-Pb测试结果表

Table 3. Test results table of biotite monzogranite zircon U-Pb

样品编号	PM12-U-Pb2					岩石名称	黑云母二长花岗岩
点号	同位素比值					表面年龄及误差(Ma)
点号	²⁰⁶Pb/ ²³⁸U	²⁰⁷Pb/ ²³⁵U	²⁰⁷Pb/ ²⁰⁶Pb	²⁰⁸Pb/ ²³²Th	²³⁸U/ ²³²Th	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ
1	0.0682	0.5240	0.0559	0.0198	2.3968	425.09	3.83	427.81	10.81	450.05	72.22
2	0.0680	0.5424	0.0578	0.0198	2.2952	424.03	3.75	439.99	9.91	524.11	61.10
3	0.2888	5.9647	0.1476	0.0651	2.6858	1635.39	32.66	1970.71	26.29	2320.38	31.33
4	0.0696	0.5386	0.0562	0.0189	1.8104	433.63	3.77	437.53	10.27	461.16	64.81
5	0.0686	0.5399	0.0573	0.0200	2.4201	427.54	4.12	438.38	12.58	505.60	81.47
6	0.0682	0.5247	0.0557	0.0198	2.8448	425.20	4.20	428.30	10.03	442.64	62.96
7	0.0683	0.5481	0.0582	0.0195	2.2280	425.71	4.04	443.77	11.68	538.93	72.21
8	0.0682	0.5256	0.0559	0.0188	1.3397	425.06	3.64	428.92	9.29	450.05	61.11
9	0.0695	0.5361	0.0559	0.0203	1.6023	433.10	4.99	435.87	12.21	455.60	75.92
10	0.0686	0.5171	0.0547	0.0197	2.0621	427.65	4.88	423.22	13.06	398.20	78.70
11	0.0686	0.5277	0.0556	0.0208	5.2381	427.88	3.46	430.31	8.00	435.23	50.00
12	0.0686	0.5151	0.0543	0.0209	2.1943	427.54	4.05	421.85	10.25	388.94	66.66
13	0.0693	0.5322	0.0556	0.0203	2.5727	431.73	3.84	433.24	9.64	435.23	61.11
14	0.0684	0.5298	0.0561	0.0206	2.4221	426.53	4.09	431.65	11.52	453.75	69.44
15	0.0686	0.5252	0.0555	0.0208	2.1768	427.83	4.16	428.61	10.26	435.23	66.66
16	0.0694	0.5630	0.0585	0.0217	2.2445	432.76	4.79	453.50	13.26	546.33	74.06
17	0.0684	0.5459	0.0578	0.0208	3.1352	426.73	5.12	442.33	12.46	520.41	75.92
18	0.0690	0.5401	0.0566	0.0204	2.3236	429.98	4.80	438.52	11.31	475.97	66.66
19	0.0689	0.5441	0.0575	0.0213	2.2112	429.28	4.10	441.16	10.99	509.30	74.99
20	0.0690	0.5370	0.0563	0.0212	2.8453	429.89	3.66	436.45	8.51	461.16	56.48
21	0.0734	0.9300	0.0911	0.0450	4.3044	456.65	5.70	667.64	13.43	1450.01	42.44
22	0.0695	0.5310	0.0554	0.0213	1.5380	433.06	5.30	432.46	13.36	427.83	83.33
23	0.0689	0.5240	0.0550	0.0212	1.5057	429.52	4.33	427.85	10.69	409.31	66.66
24	0.0693	0.5243	0.0545	0.0207	4.0551	432.08	3.92	428.00	9.96	394.50	64.81
25	0.0691	0.5175	0.0540	0.0217	2.3313	431.00	4.31	423.49	11.32	372.28	74.07
26	0.0696	0.5165	0.0535	0.0214	2.4004	433.91	4.34	422.81	10.81	350.06	70.37
27	0.0697	0.5492	0.0569	0.0202	2.3456	434.24	4.92	444.45	11.37	487.08	68.51
28	0.0697	0.5324	0.0553	0.0218	2.2845	434.06	4.27	433.37	11.17	433.38	72.22
29	0.0690	0.5317	0.0556	0.0204	2.5604	430.31	5.25	432.95	12.80	435.23	84.25
30	0.0695	0.5345	0.0554	0.0206	2.9254	433.13	4.05	434.77	10.30	427.83	69.44
31	0.0695	0.5418	0.0565	0.0209	2.1656	433.00	4.28	439.62	10.75	472.27	36.11
32	0.0693	0.5011	0.0524	0.0209	1.9385	432.03	5.12	412.44	11.56	301.91	77.77
33	0.0695	0.5102	0.0530	0.0207	2.3624	433.40	4.61	418.59	10.29	331.54	66.66
34	0.0695	0.5350	0.0560	0.0203	2.3000	433.28	4.33	435.12	10.80	450.05	65.74
35	0.0692	0.5320	0.0556	0.0208	3.2766	431.04	4.71	433.15	11.88	438.94	80.55
36	0.0694	0.5122	0.0535	0.0202	2.4103	432.43	4.04	419.96	10.91	350.06	78.70
备注：1.表中所列误差均为1σ误差；2.样品测试单位为西北大学

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