粤西印支期那蓬岩体的岩石学、地球化学特征及其成因

李坤; 孙万财; 邓飞

粤西印支期那蓬岩体的岩石学、地球化学特征及其成因

广东省佛山地质局, 广东佛山 528000

基金项目:

中国地质调查局二级项目"特殊地质地貌区填图试点"项目 DD20160060

详细信息

作者简介:
李坤(1986-), 男, 地质矿产勘查工程师, 硕士, 主要从事区域地质调查工作, E-mail:411218388@qq.com

中图分类号: P58;P534.51
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出版历程
- 收稿日期: 2016-11-14
- 刊出日期: 2017-06-28

THE PETROLOGY, GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF THE NAPENG GRANITE MASS FORMED IN INDO-CHINA PERIOD IN THE WEST OF GUANGDONG PROVINCE

Foshan Geological Bureau of Guangdong Province, Foshan 528000, China

摘要

摘要: 那蓬岩体为混合岩化-花岗岩化作用的产物，主体岩性为中细粒（斑状）黑云母二长混合花岗岩、弱片麻状细粒黑云母二长混合花岗岩，富含堇青石、矽线石、红柱石等富铝矿物，靠近岩体边部为混合片麻岩、花岗片麻岩，逐渐过渡至围岩。对中细粒黑云母二长混合花岗岩进行LA-ICPMS锆石U-Pb同位素测年，锆石以变质锆石为主、岩浆锆石为辅，获得多期锆石U-Pb年龄，将最新的变质年龄252±1.9Ma作为成岩年龄，将那蓬岩体的成岩时代定为早三叠世。那蓬岩体形成于碰撞造山构造环境。
- 粤西 /
- 那蓬岩体 /
- 混合岩化 /
- 花岗岩化 /
- 锆石U-Pb年龄 /
- 早三叠世 /
- 碰撞造山
Abstract: The Napeng granite mass is the product of migmatization and granitization, in which major lithologies are medium-fine grained (porphyritic) biotite monzonitic migmatitic granite and weak gneissic fine grained biotite monzonitic migmatitic granite, rich in a number of Al-rich minerals such as cordierite, fibrolite, bucholzite, andalusite and so on. The lithologies closed to the edge of Napeng granite mass are migmatitic gneiss and granitic gneiss, migrating to the surrounding rocks. By means of LA-ICP-MS Zircon U-Pb isotope dating on the medium-fine grained biotite monzonitic migmatitic granite, it is found that metamorphic zircons are the main zircons and few are magmatic zircons, and it is determined that the diagenetic age of the Napeng granite mass is 252±1.9Ma, the early Triassic age, in the tectonic environment of collision orogeny.
- the west of Guangdong Province /
- the Napeng granite mass /
- migmatization /
- granitization /
- Zircon U-Pb age /
- Early Triassic /
- collision orogeny

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图 1 粤西那蓬岩体区域地质简图(引用1:20万罗定幅、1:25万梧州幅及1:5万筋竹圩等四幅资料)

1—新生界; 2—中生界; 3—早古生界; 4—晚古生界; 5—元古界; 6—晚白垩世侵入岩; 7—晚三叠世侵入岩; 8—早三叠世侵入岩; 9—中细粒黑云母二长混合花岗岩; 10—中粒黑云母二长花岗岩; 11—花岗斑岩; 12—断裂; 13—韧性剪切带

Figure 1. The geological sketch map of the Napeng granite mass in the west of Guangdong province

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图 2 那蓬岩体中的片岩残余体特征

Figure 2. The characteristics of schist restite in the Napeng granite mass

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图 3 混合花岗岩野外特征

Figure 3. The field characteristics of migmatitic granite

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图 4 那蓬岩体主体及围岩地质简图(据广东1:5万筋竹、连滩、泗纶、罗定幅区域地质图修编)

1.南华系2.云开岩群3.寒武系4.奥陶系5.志留系6.白垩系7.第四系8.早三叠世二长混合花岗岩9.白垩纪花岗岩10.白垩纪花岗斑岩11.(中)细粒(斑状)黑云母二长混合花岗岩12.细粒黑云母二长花岗岩13.花岗斑岩14.含矽线石片岩15.堇青石片岩16.二云母片岩17.糜棱岩带/脆性断层18.变质带界线19.不整合界线/整合或侵入界线20.混合交代界线1混合花岗岩带2混合岩化带3正常围岩带21.采样位置

Figure 4. The geological sketch map of the Napeng granite mass and its surrounding rocks

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图 5 混合花岗岩与片麻岩呈互层状产出(层面产状与片麻岩产状一致)

Figure 5. Migmatitic Granite and Gneiss is in each layer(the attitude of lay and gneiss is the same)

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图 6 钾长石镜下特征

Figure 6. The characteristics of K-feldspar under the microscope

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图 7 堇青石镜下特征

Figure 7. The characteristics of cordierite under the microscope

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图 8 蚀变矿物镜下特征

Figure 8. The characteristic of altered minerals under the microscope

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图 9 混合岩野外特征

Figure 9. The field characteristics of migmatites

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图 10 混合岩镜下交代特征

Figure 10. The metasomatic characteristics of migmatites under the microscope

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图 11 变质矿物的镜下特征

a—重熔新生的钾长石Kfs, 黑云母Bi则多呈被挤压的残余条带状的过渡, 并趋向片状粒状结构(单偏光); b—岩石更多的是片状粒状变晶结构-半自形粒状变晶结构(单偏光)

Figure 11. The characteristics of metamorphic minerals under the microscope

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图 12 那蓬岩体稀土元素球粒陨石标准化图

Figure 12. The chondrite standard drawing of rare earth elements in the Napeng granite mass

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图 13 那蓬岩体中的锆石颗粒阴极发光照片

Figure 13. The cathodoluminescence images of zircons in the Napeng granite mass

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图 14 那蓬岩体锆石U-Pb协和年龄图

Figure 14. U-Pb concordia diagram of zircons of the Napeng granite mass

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图 15 那蓬岩体锆石U-Pb年龄数据统计图

Figure 15. U-Pb age statistical graph of zircons of the Napeng granite mass

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表 1 那蓬岩体主量元素分析结果(w%)

Table 1. The analysis results of the major elements in the Napeng granite mass (w%)

	样号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	H₂O⁺	烧失量	总量
主量元素(w%)	D1005	70.13	0.55	14.31	1.01	2.52	0.042	1.37	2.17	2.59	3.71	0.20	0.72	1.02	100.34
	D1736-1	73.58	0.55	12.63	1.03	2.75	0.032	1.30	0.64	1.12	3.35	0.17	1.60	1.76	100.51
	D1062-1	72.42	0.55	13.92	1.10	2.73	0.022	1.51	0.52	0.79	3.38	0.14	1.70	1.96	100.74

C.I.P.W 标准矿物 (w%)	样号	Or	Ab	An	C	En	Fs	Hy	Q	ap	il	Mt
	D1005	22.16	22.17	9.69	2.55	3.46	2.99	6.45	33.70	0.44	1.06	1.48
	D1736-1	20.33	9.73	2.27	6.53	3.34	3.44	6.78	51.21	0.37	1.08	1.54
	D1062-1	20.51	6.85	1.81	8.55	3.86	3.30	7.16	51.81	0.31	1.08	1.64

特征指数	样号	σ	A.R	DI	SI	FL	MF	OX	LI	Na₂O /K₂O	ALK	AKI	A/CNK
	D1005	1.46	1.92	78.27	12.23	74.38	72.04	0.60	20.08	0.70	6.30	0.44	1.69
	D1736-1	0.65	2.02	81.40	13.61	87.48	74.41	0.64	22.23	0.33	4.47	0.35	2.47
	D1062-1	0.59	1.81	79.40	15.88	88.91	71.72	0.65	21.75	0.23	4.17	0.30	2.97

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表 2 那蓬岩体微量及稀土元素分析结果

Table 2. The analysis results of trace and rare elements in the Napeng granite mass

样号	Co	Ni	Cr	V	W	Au	Ag	Sb	Sr	Ba	Li	Be	Zr	Rb	Nb	Ta	In	Cs	Th	Rb/Sr	Rb/Cs	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	LREE	HREE	LREE/HREE	(La/Yb)_N	δEu
D1005	9.81	11.7	10	80.4	138	6.61	0.16	3.75	34.5	815	41.7	3.95	220	285	9.02	0.75	0.029	16	31.3	8.26	17.81	40.74	75.74	8.47	31.12	5.35	1.1	5.06	0.78	3.98	0.61	1.22	0.12	0.24	0.06	16.1	190.69	162.52	28.17	10.09	121.76	0.64
D1736-1	6.85	9.11	10.7	72.9	173	0.9	0.1	1.7	98.9	654	23.3	3.09	209	219	8.53	0.62	0.027	11.3	30.7	2.21	19.38	16.2	30.6	3.56	13.6	2.78	0.50	2.89	0.44	2.36	0.45	1.32	0.17	1.02	0.14	11.6	87.63	67.24	20.40	5.80	11.39	0.53
D1062-1	10	15.3	14.4	72.8	97.7	1.83	0.18	5.01	126.8	731	45.9	4.97	260	243	11.1	1.09	0.041	13.1	37.8	1.92	18.55	17.4	33.9	3.86	14.4	2.85	0.56	2.89	0.41	2.12	0.39	1.05	0.13	0.84	0.12	9.70	90.61	72.97	17.64	7.52	14.95	0.59
注:分析数据为质量分数, 单位除了w(Au)的单位是10^-9外, 其余为10^-6.

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表 3 那蓬岩体LA-ICP-MS锆石U-Pb测年分析结果表

Table 3. The LA-ICP-MS Zircon U-Pb dating analysis results of the NaPeng granite mass

样号	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²⁰⁶ Pb年龄(Ma)	1σ	²⁰⁷Pb/²³⁵ U年龄(Ma)	1σ	²⁰⁶Pb/²³⁸ U年龄(Ma)	1σ
D1005-01	144.8847	244.7661	0.591931	0.0534	0.4122	0.0559	346	42.6	350	5.9	351	3.6
D1005-02	231.0150	109.3941	2.111769	0.0592	0.7044	0.0867	576	54.6	541	11.1	536	5.0
D1005-03	73.5636	212.2713	0.346555	0.0621	0.5923	0.0682	676	55.6	472	11.1	426	4.2
D1005-05	64.4562	589.9296	0.109261	0.0614	0.6097	0.0713	654	27.8	483	6.2	444	4.5
D1005-06	207.1800	850.3097	0.243652	0.0673	1.2748	0.1363	856	22.2	835	8.7	824	8.8
D1005-07	249.0018	1201.2750	0.207281	0.0897	2.8481	0.2284	1420	20.7	1368	9.1	1326	9.4
D1005-08	45.7413	960.9404	0.047601	0.0795	1.7781	0.1592	1183	21.3	1037	12.5	952	10.8
D1005-09	268.8464	671.6712	0.400265	0.0929	2.5705	0.1989	1487	23.3	1292	9.5	1169	7.9
D1005-10	18.6586	486.3612	0.038364	0.0510	0.3101	0.0440	243	34.3	274	4.1	277	2.2
D1005-11	119.9550	297.8930	0.402678	0.0690	1.3684	0.1420	902	26.9	875	12.6	856	12.0
D1005-12	167.6638	562.8250	0.297897	0.0544	0.5372	0.0712	387	31.5	437	5.0	443	3.2
D1005-13	70.6485	127.8097	0.552763	0.0571	0.5630	0.0716	494	46.3	453	7.4	446	3.7
D1005-14	83.3724	306.9606	0.271606	0.0546	0.6001	0.0795	394	40.7	477	7.4	493	5.3
D1005-15	156.8107	200.2909	0.782915	0.0711	1.6902	0.1713	961	29.63	1005	8.7	1019	6.7
D1005-16	293.6312	2016.8631	0.145588	0.0676	1.3254	0.1410	855	24.1	857	7.3	850	6.2
D1005-17	44.2500	1235.4359	0.035817	0.0679	1.3351	0.1414	865	30.6	861	7.1	853	5.2
D1005-18	292.9549	452.1747	0.64788	0.0698	1.5891	0.1637	924	25.9	966	9.2	977	8.9
D1005-19	17.1559	710.9974	0.024129	0.0491	0.2712	0.0399	150	34.3	244	3.5	252	1.9
D1005-20	182.2593	588.5203	0.309691	0.2243	11.2669	0.3607	3012	14.7	2545	9.8	1985	11.5
D1005-21	24.8185	554.8114	0.044733	0.0512	0.2857	0.0402	250	45.4	255	3.8	254	1.7
D1005-22	25.1176	409.3433	0.061361	0.0546	0.3559	0.0472	394	44.4	309	5.5	297	3.6
D1005-23	55.6929	176.4427	0.315643	0.0593	0.8415	0.1025	576	8.3	620	8.4	629	4.6
D1005-24	272.4864	562.0899	0.484774	0.1000	3.8874	0.2791	1625	-176.1	1611	11.2	1587	13.2
D1005-25	270.4372	341.2244	0.792549	0.1002	3.8810	0.2783	1628	23.8	1610	10.3	1583	9.3
D1005-26	162.7956	453.2374	0.359184	0.1117	4.7259	0.3040	1828	20.4	1772	9.2	1711	8.6
D1005-28	116.5688	655.1016	0.17794	0.0598	0.7064	0.0848	594	25.9	543	6.4	525	5.2
D1005-29	636.2001	1821.8654	0.349203	0.0593	0.8108	0.0983	576	22.2	603	4.4	605	3.1
D1005-30	901.7205	739.8623	1.218768	0.0701	1.3143	0.1347	931	22.2	852	9.3	815	10.0
D1005-31	328.9760	784.4476	0.419373	0.0704	1.5224	0.1555	940	21.9	939	6.4	932	4.6
D1005-32	88.4910	438.9295	0.201606	0.0511	0.3357	0.0474	256	48.1	294	6.0	299	3.5
D1005-33	84.8064	405.0169	0.20939	0.0544	0.5444	0.0722	387	41.7	441	6.0	450	3.8
D1005-36	113.9015	281.7185	0.404309	0.0551	0.4909	0.0643	417	46.3	406	9.3	402	7.5
D1005-37	120.5885	95.9502	1.256781	0.0581	0.7122	0.0893	600	53.7	546	10.1	551	5.4
D1005-38	127.5920	281.8625	0.452675	0.0948	2.9591	0.2241	1524	22.2	1397	12.3	1303	13.0
D1005-39	161.7950	274.3461	0.589748	0.0986	3.6945	0.2701	1598	22.2	1570	9.3	1541	9.4
D1005-40	235.1231	1606.6881	0.14634	0.0685	1.4007	0.1471	883	25.9	889	7.4	885	5.7
D1005-41	254.4262	1720.1636	0.147908	0.0690	1.2615	0.1316	898	24.8	829	7.3	797	5.5
D1005-42	275.4897	625.2869	0.440581	0.0975	4.0388	0.2974	1577	15.7	1642	11.1	1678	13.1
D1005-43	170.7003	418.1114	0.408265	0.0962	3.8217	0.2854	1551	22.2	1597	13.3	1619	17.2
D1005-44	778.8945	985.6139	0.790263	0.1607	10.4727	0.4680	2465	16.1	2478	12.9	2475	21.5
D1005-45	385.7968	1099.1755	0.350987	0.0613	0.9094	0.1066	650	22.2	657	5.5	653	4.0
D1005-46	62.8590	538.1486	0.116806	0.0567	0.5472	0.0686	480	26.9	443	9.3	428	8.2
D1005-47	107.8264	435.3079	0.247701	0.0886	2.9118	0.2353	1395	22.1	1385	12.3	1362	13.9

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参考文献(11)

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