准噶尔东部早志留世两类花岗岩的岩石成因及构造意义

肖典; 廖群安; 王良玉; 赵浩; 查雁鸿; 赵红伟; 尹庭旺; 田锦明; 刘鸿飞

准噶尔东部早志留世两类花岗岩的岩石成因及构造意义

肖典^{1, 2,},
廖群安^1, ,,
王良玉^{1, 3},
赵浩¹,
查雁鸿¹,
赵红伟¹,
尹庭旺¹,
田锦明¹,
刘鸿飞¹

1.
中国地质大学(武汉)地球科学学院, 武汉 430074
2.
四川省地质调查院, 成都 610081
3.
核工业二四三大队, 内蒙古赤峰 024006

基金项目:

中国地质调查局“特殊地质地貌区填图试点”项目 DD20160060

中国地质调查局“特殊地质地貌区填图试点”项目 12120114042801

详细信息

作者简介:
肖典(1991-), 男, 硕士, 从事1:5万区域地质调查工作。E-mail:dianx244@gmail.com

通讯作者:
廖群安(1959-), 男, 教授, 从事区调工作和岩石学研究。E-mail:qanliao@cug.edu.cn

中图分类号: P588.1;P595
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- 被引次数: 0
出版历程
- 收稿日期: 2016-09-16
- 刊出日期: 2016-12-01

PETROGENESIS AND TECTONIC IMPLICATIONS OF TWO TYPES EARLY SILURIAN GRANITES IN EAST JUNGGAR

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Sichuan Geological Survey, Chengdu 610081, China
3.
No. 243 Geological Party of Nuclear Industry, CNNC, Chifeng 024006, Inner Mongolia, China

摘要

摘要: 哈尔里克山西段早志留世二长花岗岩和正长花岗岩呈北西西向带状展布，侵入奥陶系塔水组（O_1-2t），LA-ICP-MS锆石U-Pb年龄为438.8±2.3~435.8±3.1 Ma。岩石高硅（SiO₂含量73.0%~77.8%）、富钾（K₂O含量3.31%~4.26%）、低镁（MgO含量0.03%~0.59%），铝饱和指数A/CNK值1.02~1.08，属高钾钙碱性弱过铝质岩石。二长花岗岩轻重稀土分馏显著，Eu异常中等，亏损Nb、Ta、Ti、P，富集Rb、Ba、K，表现为分异的Ⅰ型花岗岩特征，源区为基性下地壳；正长花岗岩强烈亏损Eu、P、Ti、Sr，不同程度富集Rb、K、Zr、Hf，表现为A型花岗岩特征，其源区为缺水的浅部长英质地壳。结合区域地层不整合资料，认为东准噶尔地区早志留世为后碰撞环境而非岛弧带，后碰撞软流圈上涌带来的热熔融准噶尔年轻地壳形成了岩性丰富的东准噶尔志留纪后碰撞岩浆岩组合。
- 哈尔里克 /
- 志留纪 /
- A型花岗岩 /
- 后碰撞
Abstract: The early Silurian monzogranite and syenogranite are located in the western section of Harlik Mountain with a NWW-trending, which intrude into the Ordovician Tashui Formation (O_1-2t). The LA-ICP-MS zircon U-Pb dating shows their emplacement ages are 438.8±2.3 Ma~435.8±3.1 Ma. The rocks have high contents of silicon (SiO₂=73.0~77.8%)and potassium (K₂O=3.31~4.26%), and low contents of magnesium (MgO=0.03~0.59%), with moderate aluminum saturation index (A/CNK=1.02~1.08), which show that the rocks are high-K calc-alkaline, weakly peraluminium series. Monzogranites exhibit strongly fractionated REE patterns with moderate negative Eu anomalies, and they are depleted in Nb, Ta, Ti, P, but enriched in Rb, Ba, K, showing notable fractionated Ⅰ-type granitoids with mafic lower continental crust as a potential magma source. Syenogranites show remarkably depletion of Eu, P, Ti and Sr, and enrichment of Rb, K, Zr and Hf, showing A-type granites affinity, whose magma source maybe the dehydrated felsic upper continental crust. Combined with the stratigraphic unconformity in this region, we propose that the East Junggar is in a post-collisional setting rather than arc-related setting during the early Silurian. The upwelling asthenosphere provided enhanced heat flux and triggered the partial melting of the juvenile crust, and resulted in the generation of various Silurian post-collisional granites in East Jungga.
- Harlik /
- Silurian /
- A-type granite /
- post-collision

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致谢: Steven Wojtal, Christopher Talbot和Roberto Weinberg对本文提出了许多建设性的修改意见, 作者在此表示感谢。本文是在国家自然科学基金面上项目(Project No. 40572119)资助下完成。

图 1 哈尔里克山西段早志留世酸性侵入岩带地质简图

a-新疆北部主要蛇绿岩带分布图^[14];b-哈尔里克山天山庙地质简图

Figure 1. Simplified geological map of the early Silurian acid intrusive rock belt in western Harlik

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图 2 二长花岗质糜棱岩和正长花岗岩野外及正交镜下照片

Q-石英; Pl-斜长石; Kf-钾长石; Pth-条纹长石; Or-正长石

Figure 2. Field photos and micrographs of monzogranitic mylonite and syenogranite

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图 3 二长花岗岩(a)、正长花岗岩(b)典型锆石阴极发光图像及其U-Pb年龄谐和图

Figure 3. Representative zircon CL images and U-Pb concordia diagrams for monzogranite and syenogranite

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图 4 哈尔里克山西段早志留世酸性侵入岩SiO₂-K₂O及A/CNK-A/NK图解^[16~17]

Figure 4. SiO₂-K₂O and A/CNK-A/NK diagrams from the early Silurian acid intrusive rock in western Harlik

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图 5 哈尔里克山西段早志留世酸性侵入岩球粒陨石标准化稀土元素配分图^[19]及微量元素蛛网图^[20]

Figure 5. REE and trace element spider diagrams of the early Silurian acid intrusive rock in western Harlik

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图 6 花岗岩Q-Ab-Or图^[23]、SiO₂-P₂O₅图及成因分类图解(c—e据^[24], f据^[25])

Figure 6. Q-Ab-Or, SiO₂-P₂O₅ and genetic classification diagrams of granite

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图 7 哈尔里克山西段早志留世酸性侵入岩构造判别图^[33~34]

①-地幔斜长花岗岩; ②-板块碰撞前消减带花岗岩; ③-碰撞后隆起区花岗岩; ④-造山晚期花岗岩; ⑤-非造山花岗岩; ⑥-同碰撞花岗岩; ⑦-造山期后花岗岩

Figure 7. Tectonic discriminating diagrams of the early Silurian acid intrusive rock in western Harlik

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表 1 二长花岗岩及正长花岗岩LA-ICP-MS锆石U-Pb同位素测定结果

Table 1. LA-ICP-MS zircon U-Pb analytical data of monzogranite granite and syenogranite

测试点号	含量/10^-6			同位素比值					rho	年龄/Ma				谐和度
测试点号	^TotPb	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/U²³⁵	1σ	²⁰⁶Pb/U²³⁸	1σ	rho	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和度
6-1-1	88	256	175	1.46	0.54530	0.02537	0.07087	0.00096	0.29070	441.9	16.7	441.4	5.8	99%
6-1-2	118	323	279	1.16	0.55938	0.02303	0.07107	0.00081	0.27717	451.1	15.0	442.6	4.9	98%
6-1-3	107	298	328	0.91	0.56076	0.02145	0.06349	0.00064	0.26344	452.0	14.0	396.8	3.9	86%
6-1-4	135	378	267	1.41	0.57805	0.02126	0.07067	0.00093	0.35683	463.2	13.7	440.2	5.6	94%
6-1-5	199	531	454	1.17	0.59651	0.02125	0.07140	0.00070	0.27347	475.0	13.5	444.6	4.2	93%
6-1-6	74	194	228	0.85	0.55959	0.03037	0.07033	0.00119	0.31240	451.3	19.8	438.2	7.2	97%
6-1-7	130	357	292	1.22	0.55107	0.01895	0.07089	0.00077	0.31660	445.7	12.4	441.5	4.7	99%
6-1-8	117	317	253	1.25	0.57510	0.02105	0.07062	0.00087	0.33594	461.3	13.6	439.9	5.2	95%
6-1-9	62	177	149	1.19	0.62054	0.02718	0.07054	0.00103	0.33232	490.2	17.0	439.4	6.2	89%
6-1-10	89	244	275	0.89	0.56684	0.02304	0.06904	0.00091	0.32499	456.0	14.9	430.4	5.5	94%
6-1-11	67	176	191	0.92	0.64106	0.03184	0.07034	0.00109	0.31246	503.0	19.7	438.2	6.6	86%
6-1-12	93	272	255	1.07	0.61367	0.02545	0.07136	0.00094	0.31598	485.9	16.0	444.3	5.6	91%
6-1-13	164	483	440	1.10	0.58525	0.01905	0.06971	0.00064	0.28022	467.8	12.2	434.4	3.8	92%
6-1-14	150	431	399	1.08	0.55626	0.01688	0.07008	0.00076	0.35720	449.1	11.0	436.6	4.6	97%
6-1-15	95	249	287	0.87	0.57430	0.02401	0.07057	0.00088	0.29934	460.8	15.5	439.6	5.3	95%
6-1-16	122	341	267	1.28	0.52404	0.02208	0.07072	0.00094	0.31554	427.8	14.7	440.5	5.7	97%
6-1-17	85	218	274	0.79	0.54034	0.01976	0.06996	0.00102	0.39842	438.6	13.0	435.9	6.1	99%
6-1-18	73	199	251	0.79	0.56191	0.02098	0.06864	0.00098	0.38287	452.8	13.6	428.0	5.9	94%
6-1-19	108	298	356	0.84	0.54723	0.01769	0.06996	0.00077	0.34166	443.2	11.6	435.9	4.7	98%
6-1-20	123	325	334	0.97	0.55780	0.01918	0.07104	0.00079	0.32143	450.1	12.5	442.4	4.7	98%
1458-1-1	126	274	466	0.59	0.58972	0.02053	0.07042	0.00095	0.38903	470.7	13.1	438.7	5.7	92%
1458-1-2	417	932	833	1.12	0.67608	0.01818	0.07141	0.00075	0.38992	524.4	11.0	444.6	4.5	83%
1458-1-3	134	279	518	0.54	0.59189	0.01755	0.06859	0.00059	0.28931	472.1	11.2	427.6	3.6	90%
1458-1-4	244	575	693	0.83	0.58317	0.01724	0.06983	0.00078	0.37580	466.5	11.1	435.1	4.7	93%
1458-1-5	197	385	577	0.67	0.69410	0.02071	0.07035	0.00062	0.29367	535.3	12.4	438.3	3.7	80%
1458-1-6	145	322	518	0.62	0.56713	0.01991	0.06966	0.00084	0.34456	456.2	12.9	434.1	5.1	95%
1458-1-7	117	257	431	0.60	0.57266	0.01803	0.06979	0.00071	0.32382	459.7	11.6	434.9	4.3	94%
1458-1-8	75	164	305	0.54	0.56195	0.01985	0.06912	0.00082	0.33401	452.8	12.9	430.8	4.9	95%
1458-1-9	148	317	509	0.62	0.60223	0.02262	0.07210	0.00108	0.39857	478.6	14.3	448.8	6.5	93%
1458-1-10	142	333	537	0.62	0.53956	0.01780	0.06967	0.00085	0.37077	438.1	11.7	434.2	5.1	99%
1458-1-11	140	322	453	0.71	0.56567	0.02791	0.07215	0.00135	0.37791	455.2	18.1	449.1	8.1	98%
1458-1-12	104	235	395	0.59	0.56548	0.01964	0.06989	0.00105	0.43257	455.1	12.7	435.5	6.3	95%
1458-1-13	128	274	477	0.57	0.52948	0.02016	0.07113	0.00103	0.37913	431.5	13.4	442.9	6.2	97%
1458-1-14	127	278	502	0.55	0.54827	0.02037	0.07091	0.00104	0.39518	443.9	13.4	441.6	6.3	99%
1458-1-15	154	332	555	0.60	0.58246	0.03455	0.06980	0.00089	0.21390	466.0	22.2	435.0	5.3	93%
1458-1-16	104	234	402	0.58	0.52215	0.02313	0.07106	0.00118	0.37456	426.6	15.4	442.5	7.1	96%
1458-1-17	148	291	426	0.68	0.63807	0.02119	0.07073	0.00092	0.39001	501.1	13.1	440.6	5.5	87%
1458-1-18	112	226	382	0.59	0.72545	0.06040	0.07142	0.00093	0.15642	553.9	35.5	444.7	5.6	78%
1458-1-19	436	826	1040	0.79	0.72088	0.02301	0.07399	0.00082	0.34696	551.2	13.6	460.2	4.9	81%
1458-1-20	165	306	493	0.62	0.68070	0.02961	0.07144	0.00110	0.35257	527.2	17.9	444.8	6.6	83%
1458-1-21	234	532	691	0.77	0.56210	0.01530	0.06923	0.00089	0.47121	452.9	9.9	431.5	5.4	95%

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表 2 哈尔里克山西段早志留世酸性侵入岩主量元素(%)、微量元素(10^-6)分析结果

Table 2. Major and trace element concentrations for the early Silurian acid intrusive rock in western Harlik

样号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	Total	FeO*	Mg#	DI	A/CNK	V	Cr	Ga	Rb	Sr	Y	Zr	Nb	Ta	Th	U	Pb	Cs	Hf	Ba	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	(La/Yb)_N	(La/Sm)_N	δEu
D3540-1H	二长花岗岩	75.3	0.18	12.96	1.38	0.07	0.31	0.85	4.28	3.67	0.04	0.47	99.54	1.24	30.80	92.70	1.03	16	10	13.5	67.4	167	14.9	113	7.0	0.7	11.85	2.26	14	0.27	3.2	977	54.9	5.70	18.3	3.30	0.67	2.70	0.37	2.31	0.48	1.51	0.24	1.74	0.29	122.81	11.77	5.78	0.67
D3540-3H		73.0	0.29	14.02	2.11	0.09	0.59	1.74	3.76	3.94	0.08	1.05	100.69	1.90	35.65	86.67	1.03	34	10	14.5	90.6	305	12.2	150	6.0	0.5	11.00	1.72	15	1.25	3.5	961	53.2	5.41	17.1	2.90	0.75	2.23	0.29	1.86	0.39	1.20	0.20	1.48	0.23	117.84	13.97	6.64	0.87
D2591-4H		77.8	0.15	12.29	1.14	0.04	0.25	0.67	3.99	3.31	0.02	0.63	100.27	1.03	30.29	93.61	1.08	16	10	10.8	49.7	149	12.0	86	6.9	0.6	12.50	2.61	13	0.16	2.4	775	48.8	4.73	14.3	2.44	0.44	1.89	0.25	1.67	0.35	1.09	0.18	1.29	0.20	106.73	15.24	7.51	0.60
D1352-1H	正长花岗岩	76.8	0.08	11.88	1.64	0.02	0.05	0.08	4.19	4.06	< 0.01	0.25	99.02	1.48	5.70	96.96	1.04	7	20	21.6	121.5	37	66.1	278	17.5	1.2	12.35	2.28	12	0.37	8.9	407	103.0	11.05	42.8	10.40	0.88	10.65	1.75	12.15	2.63	8.09	1.28	8.17	1.28	253.73	3.28	2.40	0.25
D1352-2H		76.5	0.09	12.04	1.74	0.03	0.06	0.07	4.55	3.76	< 0.01	0.19	99.02	1.57	6.40	96.94	1.03	8	20	21.7	87.7	44	69.3	357	20.2	1.8	14.90	2.54	12	0.20	11.	369	89.0	8.98	33.6	7.91	0.65	8.36	1.42	10.35	2.30	7.65	1.22	8.35	1.34	213.73	2.64	2.59	0.24
D2591-4H		76.6	0.09	12.04	1.77	0.06	0.03	0.05	4.31	4.26	0.02	0.14	99.41	1.59	3.25	97.18	1.02	6	20	23.2	105.5	23	84.0	313	18.5	1.5	13.15	2.33	15	0.14	8.9	461	105.5	11.85	44.1	10.80	0.91	10.70	1.81	12.60	2.72	8.58	1.28	8.91	1.32	265.98	3.41	2.62	0.26
注:FeO=0.8998×Fe₂O₃; 镁值Mg#=molar 100×Mg/(Mg+FeO); DI=标准矿物(Q+Af+Ab+Ne+Kp+Lc); δEu=2×Eu_N/(Sm_N+Gd_N); A/CNK=Al₂O₃/(CaO+ Na₂O+K₂O)分子比; (La/Yb)_N代表La和Yb球粒陨石标准化比值

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表 3 哈尔里克山西段早志留世酸性侵入岩锆石饱和温度计算结果

Table 3. Values of zircon saturation thermometer for the Early Silurian acid intrusive rock in western Harlik

岩性	样品编号	Na	K	Ca	Al	Si	Zr	M	D	T/℃
二长花岗岩	D3540-1	0.0781	0.0441	0.0086	0.1438	0.7091	113	1.37	4389.4	759
	D3540-3	0.0684	0.0472	0.0175	0.1551	0.6852	150	1.42	3306.7	779
	D2591-4	0.0728	0.0397	0.0068	0.1363	0.7314	86	1.26	5767.4	743
正长花岗岩	D1352-1	0.0770	0.0491	0.0008	0.1327	0.7273	278	1.32	1784.2	842
	D1352-2	0.0833	0.0453	0.0007	0.1341	0.7224	357	1.34	1389.4	865
	D1352-3	0.0787	0.0512	0.0005	0.1337	0.7217	313	1.36	1584.7	851

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