云开地区早古生代宁潭片麻状花岗质岩体锆石U-Pb定年、岩石成因及构造背景

夏金龙; 黄圭成; 丁丽雪; 陈希清; 定立

doi:10.3799/dqkx.2018.529

云开地区早古生代宁潭片麻状花岗质岩体锆石U-Pb定年、岩石成因及构造背景

doi: 10.3799/dqkx.2018.529

夏金龙^1,2,,
黄圭成^1,2,
丁丽雪^1,2,
陈希清^1,2,
定立^1,2

1.
中国地质调查局武汉地质调查中心, 湖北武汉 430205
2.
中国地质调查局花岗岩成岩成矿地质研究中心, 湖北武汉 430205

基金项目:

中国地质调查局项目 121201009000150002

中国地质调查局项目 12120114039401

详细信息

作者简介:
夏金龙(1985-), 男, 工程师, 主要从事岩石学、矿床学研究

中图分类号: P581
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出版历程
- 收稿日期: 2018-02-06
- 刊出日期: 2018-07-15

Zircon U-Pb Dating, Petrogenesis and Tectonic Background of the Early Paleozoic Ningtan Gneissic Granitic Pluton, in the Yunkai Terrane

Xia Jinlong^{1,2
,},
Huang Guicheng^1,2,
Ding Lixue^1,2,
Chen Xiqing^1,2,
Ding Li^1,2

1.
Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Research Center of Granitic Diagenesis and Mineralization, China Geological Survey, Wuhan 430205, China

摘要

摘要: 华南地区广泛发育的早古生代岩体形成的构造背景是近年来的研究焦点.云开地区是华南早古生代构造-岩浆活动最为强烈的地区之一.对本地区宁潭片麻状花岗质岩体进行详细的锆石LA-ICP-MS U-Pb定年和地球化学研究表明，宁潭岩体岩浆锆石发育较为明显的振荡环带，偶见被包裹的继承锆石核；3个样品的LA-ICP-MS锆石U-Pb年龄分别为430±2 Ma、426±4 Ma、433±2 Ma，指示该岩体侵位于早古生代.宁潭岩体富Si、Al，贫Mg、Ca，CIPW标准矿物中出现刚玉分子，属高钾钙碱性系列过铝质花岗岩类.其稀土元素配分曲线呈明显的海鸥型，显示较强负Eu异常，稀土元素分馏程度较低；亏损高场强元素，富集轻稀土元素及大离子亲石元素；全岩（⁸⁷Sr/⁸⁶Sr）_i值较高（0.711 30~0.718 42），ε_Nd（t）值较为均一（-8.6~-8.1），对应的T_DM2值为1 827~1 848 Ma；岩浆锆石ε_Hf（t）值变化范围较大（-10.9~-2.5），对应的T_DM2值主要分布于1 600~2 000 Ma，峰值明显（~1 800 Ma）.上述特征表明宁潭岩体属于地壳物质重熔型花岗岩，主要起源于华夏元古宙基底物质的重熔，源区以变质泥岩、变质砂岩为主.宁潭岩体侵位时华南地区陆内造山带处于后造山伸展垮塌阶段，该岩体的侵位与造山后的伸展作用有关.
- 锆石U-Pb /
- 岩石成因 /
- 早古生代 /
- 陆内造山 /
- 云开地区 /
- 地球化学
Abstract: Numerous researches have focused on the Early Paleozoic magmatic rocks widely developed in South China, because of their ambiguous petrogenesis. We present here the zircon U-Pb dating and geochemical data for the Ningtan gneissic granitic pluton in the Yunkai terrane, which experienced intensive tectonic-magmatic activity during the Early Paleozoic. Cathodoluminescence imaging reveals that these zircon crystals generally have oscillatory zoning and the inherited zircons are exposed. LA-ICP-MS zircon U-Pb dating of the three samples yielded weighted mean ages of 430±2 Ma, 426±4 Ma and 433±2 Ma, respectively indicating that the pluton was emplaced in the Early Paleozoic. The major element geochemistry is characterized by high content of Si, Al, low content of Mg, Ca and the appearance of corundum in CIPW standard mineral. The Ningtan pluton is composed of high-K calc alkaline peraluminous granitoids. The REE distribution curves show the seagull-shape, with strong depletion in Eu anomaly. They exhibit strongly negative high field strength elements and enrichment of light rare earth elements, large ion lithophile elements. The isotope data are characterized by high initial (⁸⁷Sr/⁸⁶Sr)_i ratio (0.711 30 to 0.718 42), negative ε_Nd(t) values (-8.6 to -8.1) and negative ε_Hf(t) values (-10.9 to -2.5). The two stage Nd-isotope model ages (T_DM2) are 1 827-1 848 Ma. The two stage Hf-isotope model ages (T_DM2) mainly distribute in 1 600-2 000 Ma, with the peak value of~1 800 Ma. These geochemical data indicate that the Ningtan pluton belongs to the crust-derived granite category, originated from the remelting of Cathaysia Proterozoic basement, mainly metamorphic argillaceous rocks and sandstone. The emplacement of the Ningtan pluton, was formed in an extensional background, as a result of the intracontinental orogenic collapse of South China in Early Paleozoic.
- Zircon U-Pb /
- petrogenesis /
- Early Paleozoic /
- intracontinental orogeny /
- Yunkai terrane /
- geochemistry

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图 1 云开地区宁潭岩体地质图

a.云开地区早古生代岩体分布示意；b.研究区采样点

Fig. 1. Geological map of the Ningtan pluton

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图 2 宁潭岩体野外露头及显微照片

Qz.石英；Pl.斜长石；Kfs.钾长石；Bt.黑云母；Ms.白云母

Fig. 2. Outcrop and photomicrographs of the Ningtan pluton

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图 3 宁潭岩体锆石代表性CL图像

实线小圆环代表U-Pb年龄分析点(直径为32 μm)，虚线大圆环代表Lu-Hf同位素分析点；两组分析结果分别为U-Pb年龄及其对应的ε_Hf(t)值

Fig. 3. Cathodoluminescence images of selected zircon grains from the Ningtan pluton

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图 4 宁潭岩体锆石U-Pb年龄谐和图

Fig. 4. U-Pb Concordia diagrams of zircons from the Ningtan pluton

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图 5 宁潭岩体锆石ε_Hf(t)值和Hf同位素两阶段模式年龄直方图

Fig. 5. Histograms of zircon ε_Hf(t) values and Hf two stage isotopic model ages for the Ningtan pluton

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图 6 宁潭岩体SiO₂-K₂O图解(a)和A/CNK-A/NK图解(b)

底图分别据Peccerillo and Taylor(1976), Maniar and Piccoli(1989).黑色点为本研究结果，灰色点数据陆济璞和蔡贺清(2002)

Fig. 6. Plot of SiO₂ vs. K₂O (a) and A/CNK vs. A/NK (b) for the Ningtan pluton

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图 7 宁潭岩体稀土元素球粒陨石标准化分布型曲线(a)和微量元素原始地幔标准化蛛网图(b)

球粒陨石与原始地幔数据均引自Sun and Mcdonough(1989).黑色线条为本研究结果，灰色线条数据陆济璞和蔡贺清(2002)

Fig. 7. Chondrite-normalized rare earth element diagrams and primitive mantle-normalized trace element spidergrams and for the Ningtan pluton

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图 8 宁潭岩体(⁸⁷Sr/⁸⁶Sr)_i-ε_Nd(t)关系(a)和ε_Nd(t)-ε_Hf(t)关系(b)

华南地区显生宙I型和S型花岗岩区域引自Ling et al.(2001)；洋中脊玄武岩、洋岛玄武岩和全球沉积物数据区域引自Vervoort et al.(1999)；全球下地壳数据区域引自Vervoort et al.(2000)

Fig. 8. Plots of initial (⁸⁷Sr/⁸⁶Sr)_i vs. ε_Nd(t) (a) and ε_Nd(t) vs. ε_Hf(t) for the Ningtan pluton (b)

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图 9 宁潭岩体摩尔CaO/(MgO+FeO_t)-摩尔Al₂O₃/(MgO+FeO_t)图解

底图据Alther et al.(2000).图例如图 6

Fig. 9. Molar CaO/(MgO+FeO_t)-molar Al₂O₃/(MgO+FeO_t) diagram

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图 10 宁潭岩体Rb-(Y+Nb)构造环境判别图

底图据Pearce(1996).ORG.洋中脊花岗岩；WPG.板内花岗岩；VAG.火山弧花岗岩；syn-COLG.同碰撞花岗岩；post-COLG.后碰撞花岗岩；UCC.大陆上地壳；BCC.整体大陆地壳；LCC.大陆下地壳.图例如图 6

Fig. 10. The Rb-(Y+Nb) diagram for discriminating the tectonic setting of the Ningtan pluton

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表 1 宁潭岩体LA-ICP-MS锆石U-Pb分析结果

Table 1. Zircon U-Pb age analysis results of the Ningtan pluton by LA-ICP-MS

测点	Th(10^-6)	U(10^-6)	Th/U	同位素比值							年龄(Ma)						谐和度(%)
测点	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ		²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	谐和度(%)
XD115片麻状二长花岗岩
XD115-1	90	314	0.29	0.068 5	0.000 8	0.556 3	0.010 2	0.058 9	0.000 9		427	5	449	8	563	33	95
XD115-2	76	1 587	0.05	0.069 1	0.000 8	0.539 5	0.007 9	0.056 6	0.000 7		431	5	438	6	477	27	98
XD115-3	59	273	0.22	0.069 2	0.000 8	0.557 5	0.010 0	0.058 4	0.000 9		431	5	450	8	546	35	96
XD115-4	88	519	0.17	0.069 7	0.000 8	0.535 7	0.008 0	0.055 8	0.000 7		434	5	436	6	444	29	100
XD115-5	63	245	0.26	0.068 3	0.000 8	0.527 7	0.008 9	0.056 0	0.000 8		426	5	430	7	453	33	99
XD115-6	64	237	0.27	0.068 1	0.000 8	0.565 6	0.009 8	0.060 3	0.001 0		425	5	455	8	613	34	93
XD115-7	70	390	0.18	0.067 9	0.000 8	0.543 4	0.008 3	0.058 0	0.000 8		424	5	441	7	530	30	96
XD115-8	59	335	0.18	0.063 2	0.000 7	0.498 1	0.008 3	0.057 1	0.000 9		395	5	410	7	497	34	96
XD115-9	174	652	0.27	0.064 2	0.000 7	0.514 8	0.007 5	0.058 2	0.000 7		401	4	422	6	535	28	95
XD115-10	148	330	0.45	0.068 1	0.000 8	0.552 4	0.009 8	0.058 8	0.000 9		425	5	447	8	561	32	95
XD115-11	160	1 938	0.08	0.064 1	0.000 7	0.499 5	0.007 1	0.056 5	0.000 7		400	4	411	6	473	27	97
XD115-12	70	379	0.18	0.069 0	0.000 8	0.546 8	0.008 3	0.057 5	0.000 8		430	5	443	7	510	29	97
XD115-13	46	289	0.16	0.068 7	0.000 8	0.537 6	0.009 2	0.056 8	0.000 9		428	5	437	8	483	34	98
XD115-14	179	198	0.90	0.068 7	0.000 8	0.556 5	0.009 8	0.058 8	0.001 0		428	5	449	8	559	36	95
XD115-15	623	570	1.09	0.069 4	0.000 8	0.618 9	0.010 9	0.064 7	0.000 9		432	5	489	9	765	29	88
XD115-16	95	196	0.49	0.070 1	0.000 8	0.583 5	0.011 1	0.060 4	0.001 1		437	5	467	9	617	40	94
XD115-17	52	788	0.07	0.069 3	0.000 8	0.547 4	0.008 1	0.057 3	0.000 7		432	5	443	7	502	28	97
XD115-18	102	287	0.35	0.074 1	0.000 8	0.600 3	0.009 4	0.058 8	0.000 8		461	5	477	7	558	31	97
XD115-19	124	1 543	0.08	0.069 8	0.000 8	0.551 2	0.007 8	0.057 3	0.000 7		435	5	446	6	503	27	98
XD115-20	116	306	0.38	0.069 0	0.000 8	0.577 4	0.009 7	0.060 7	0.000 9		430	5	463	8	627	34	93
XD115-21	108	887	0.12	0.069 8	0.000 8	0.552 7	0.007 9	0.057 4	0.000 7		435	5	447	6	508	28	97
XD115-22	76	102	0.74	0.452 8	0.005 3	10.121 8	0.148 1	0.162 1	0.002 0		2 408	28	2 446	36	2 478	21	97
XD115-23	57	323	0.18	0.072 7	0.000 8	0.587 2	0.009 8	0.058 6	0.000 9		452	5	469	8	552	33	96
XD115-24	75	223	0.34	0.070 2	0.000 8	0.599 4	0.010 3	0.061 9	0.001 0		437	5	477	8	672	35	92
XD115-25	138	1 395	0.10	0.069 4	0.000 8	0.554 9	0.008 0	0.058 0	0.000 7		433	5	448	6	528	27	97
XD115-26	99	1 447	0.07	0.070 4	0.000 8	0.549 0	0.007 8	0.056 6	0.000 7		438	5	444	6	476	27	99
XD115-27	70	1 112	0.06	0.074 4	0.000 8	0.597 2	0.008 5	0.058 2	0.000 7		463	5	475	7	538	27	97
XD116片麻状二长花岗岩
XD116-1	88	503	0.18	0.068 5	0.000 8	0.527 2	0.008 6	0.055 8	0.000 8		427	5	430	7	446	31	99
XD116-2	67	445	0.15	0.069 5	0.000 8	0.553 8	0.009 4	0.057 8	0.000 9		433	5	448	8	522	34	97
XD116-3	85	610	0.14	0.071 3	0.000 8	0.556 5	0.009 7	0.056 6	0.000 9		444	5	449	8	477	36	99
XD116-4	60	110	0.55	0.069 2	0.000 8	0.502 7	0.019 0	0.052 7	0.001 9		431	5	413	16	315	84	104
XD116-5	60	514	0.12	0.070 2	0.000 8	0.544 3	0.008 6	0.056 2	0.000 8		437	5	441	7	462	32	99
XD116-6	108	276	0.39	0.068 3	0.000 7	0.665 0	0.017 1	0.070 6	0.001 8		426	5	518	13	947	51	82
XD116-7	153	444	0.35	0.068 0	0.000 7	0.539 9	0.008 8	0.057 6	0.000 9		424	5	438	7	514	33	97
XD116-8	261	434	0.60	0.069 1	0.000 8	0.542 0	0.008 8	0.056 9	0.000 8		431	5	440	7	488	32	98
XD116-9	76	518	0.15	0.068 9	0.000 8	0.634 0	0.009 9	0.066 7	0.001 0		429	5	499	8	830	30	86
XD116-10	61	588	0.10	0.067 6	0.000 7	0.542 5	0.009 1	0.058 2	0.000 9		422	5	440	7	537	34	96
XD116-11	96	1 022	0.09	0.069 9	0.000 8	0.550 8	0.007 9	0.057 1	0.000 7		436	5	446	6	497	28	98
XD116-12	106	1 030	0.10	0.067 7	0.000 7	0.543 6	0.008 2	0.058 2	0.000 8		423	5	441	7	537	31	96
XD116-13	87	723	0.12	0.068 5	0.000 8	0.552 6	0.008 2	0.058 5	0.000 8		427	5	447	7	549	30	96
XD116-14	107	2 282	0.05	0.069 1	0.000 8	0.558 3	0.007 9	0.058 6	0.000 7		431	5	450	6	551	28	96
XD116-15	186	229	0.81	0.067 9	0.000 7	0.591 0	0.012 7	0.063 1	0.001 3		424	5	472	10	712	44	90
XD116-16	182	323	0.56	0.068 0	0.000 7	0.559 2	0.009 4	0.059 7	0.000 9		424	5	451	8	591	34	94
XD116-17	246	336	0.73	0.067 5	0.000 8	0.538 0	0.012 3	0.057 8	0.001 2		421	5	437	10	522	46	96
XD116-18	145	759	0.19	0.066 5	0.000 7	0.524 1	0.007 7	0.057 2	0.000 8		415	5	428	6	498	29	97
XD116-19	151	1 797	0.08	0.067 3	0.000 7	0.525 2	0.007 5	0.056 6	0.000 7		420	5	429	6	476	28	98
XD116-20	71	505	0.14	0.065 8	0.000 7	0.554 9	0.008 6	0.061 2	0.000 9		411	4	448	7	645	31	92
XD116-21	74	302	0.25	0.067 7	0.000 7	0.653 4	0.013	0.070 0	0.001 3		422	5	511	10	930	39	83
XD116-22	59	232	0.26	0.066 7	0.000 7	0.524 7	0.010 9	0.057 1	0.001 1		416	5	428	9	494	43	97
XD116-23	44	243	0.18	0.066 7	0.000 7	0.599 9	0.012 6	0.065 2	0.001 3		416	5	477	10	781	42	87
XD116-24	70	604	0.12	0.068 7	0.000 8	0.568 1	0.008 8	0.060 0	0.000 9		428	5	457	7	604	31	94
XD116-25	118	620	0.19	0.069 3	0.000 8	0.557 9	0.008 5	0.058 4	0.000 8		432	5	450	7	545	30	96
XD116-26	146	142	1.03	0.143 9	0.001 6	1.519 6	0.027 7	0.076 6	0.001 3		866	10	938	17	1 111	35	92
XD119片麻状二长花岗岩
XD119-1	59	354	0.17	0.069 2	0.000 7	0.531 9	0.009 3	0.055 8	0.000 9		431	5	433	8	443	35	100
XD119-2	66	526	0.12	0.069 3	0.000 7	0.530 0	0.007 9	0.055 5	0.000 7		432	5	432	6	432	30	100
XD119-3	77	380	0.20	0.069 6	0.000 7	0.674 7	0.011 4	0.070 3	0.001 1		434	5	524	9	938	32	83
XD119-4	134	390	0.34	0.069 5	0.000 8	0.539 4	0.008 7	0.056 3	0.000 8		433	5	438	7	463	32	99
XD119-5	230	902	0.25	0.069 9	0.000 7	0.552 1	0.008 1	0.057 3	0.000 7		436	5	446	7	503	29	98
XD119-6	55	275	0.20	0.069 4	0.000 8	0.555 3	0.010 7	0.058 0	0.001 0		433	5	448	9	530	39	96
XD119-7	69	488	0.14	0.068 5	0.000 7	0.534 4	0.008 7	0.056 5	0.000 8		427	5	435	7	474	33	98
XD119-8	106	278	0.38	0.068 9	0.000 8	0.596 4	0.012 4	0.062 8	0.001 2		430	5	475	10	701	41	90
XD119-9	124	711	0.17	0.069 1	0.000 7	0.529 5	0.008 0	0.055 6	0.000 8		431	5	431	7	437	30	100
XD119-10	114	312	0.37	0.069 4	0.000 8	0.591 9	0.010 4	0.061 9	0.001 0		432	5	472	8	670	35	92
XD119-11	96	216	0.44	0.069 6	0.000 8	0.582 6	0.012 9	0.060 7	0.001 3	434	5	466	10	628	45	93
XD119-12	50	388	0.13	0.068 8	0.000 7	0.581 6	0.009 7	0.061 3	0.000 9	429	5	465	8	650	33	92
XD119-13	55	365	0.15	0.068 9	0.000 7	0.597	0.010 2	0.062 8	0.001 0	430	5	475	8	703	35	90
XD119-14	67	345	0.19	0.069 1	0.000 7	0.563 3	0.009 4	0.059 1	0.000 9	431	5	454	8	571	34	95
XD119-15	103	341	0.30	0.069 6	0.000 7	0.648 9	0.011 3	0.067 6	0.001 1	434	5	508	9	856	33	85
XD119-16	182	475	0.38	0.069 5	0.000 8	0.730 8	0.011 4	0.076 2	0.001 1	433	5	557	9	1 101	29	78
XD119-17	85	358	0.24	0.069 5	0.000 7	0.600 2	0.010 4	0.062 7	0.001 0	433	5	477	8	697	34	91
XD119-18	82	420	0.20	0.069 0	0.000 7	0.617 7	0.011 2	0.064 9	0.001 1	430	5	488	9	770	37	88
XD119-19	59	563	0.10	0.069 9	0.000 7	0.535 0	0.008 2	0.055 5	0.000 8	436	5	435	7	433	30	100
XD119-20	73	249	0.29	0.069 8	0.000 8	0.571 9	0.009 9	0.059 4	0.001 0	435	5	459	8	582	36	95
XD119-21	55	276	0.20	0.069 7	0.000 8	0.558 7	0.009 8	0.058 1	0.000 9	434	5	451	8	535	36	96
XD119-22	65	389	0.17	0.070 1	0.000 8	0.580 5	0.009 8	0.060 0	0.000 9	437	5	465	8	605	34	94
XD119-23	89	609	0.15	0.070 6	0.000 8	0.574 2	0.009 2	0.059 0	0.000 8	440	5	461	7	568	31	95
XD119-24	37	132	0.28	0.069 6	0.000 8	0.578 0	0.015 7	0.060 3	0.001 6	434	5	463	13	613	56	94
XD119-25	46	182	0.26	0.069 7	0.000 8	0.569 1	0.011 9	0.059 2	0.001 2	434	5	457	10	575	43	95
XD119-26	126	749	0.17	0.070 2	0.000 8	0.567 5	0.008 3	0.058 6	0.000 8	437	5	456	7	554	29	96

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表 2 宁潭岩体锆石Lu-Hf同位素分析结果

Table 2. Zircon Lu-Hf isotopic data of the Ningtan pluton

测点	年龄(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	±2σ	¹⁷⁶Lu/¹⁷⁷Hf	±2σ	¹⁷⁶Hf/¹⁷⁷Hf	±2σ	¹⁷⁶Hf/¹⁷⁷Hf	ε_Hf(0)	ε_Hf(t)	T_DM1(Ma)	T_DM2(Ma)	f_Lu/Hf
XD115片麻状二长花岗岩
3	430	0.053 939	0.000 228	0.001 413	0.000 004	0.282 251	0.000 039	0.282 240	-18.4	-9.4	1 429	2 002	-0.96
4	430	0.084 444	0.000 522	0.002 261	0.000 005	0.282 270	0.000 032	0.282 252	-17.8	-9.0	1 435	1 976	-0.93
5	430	0.053 463	0.000 273	0.001 442	0.000 003	0.282 347	0.000 025	0.282 336	-15.0	-6.0	1 294	1 788	-0.96
6	430	0.066 223	0.000 266	0.001 638	0.000 001	0.282 387	0.000 021	0.282 374	-13.6	-4.6	1 244	1 703	-0.95
7	430	0.060 850	0.000 467	0.001 723	0.000 009	0.282 282	0.000 021	0.282 269	-17.3	-8.4	1 396	1 938	-0.95
10	430	0.056 661	0.000 271	0.001 777	0.000 008	0.282 323	0.000 018	0.282 309	-15.9	-6.9	1 340	1 848	-0.95
12	430	0.056 872	0.000 233	0.001 882	0.000 007	0.282 325	0.000 016	0.282 310	-15.8	-6.9	1 341	1 846	-0.94
13	430	0.065 408	0.000 233	0.001 741	0.000 002	0.282 364	0.000 019	0.282 350	-14.4	-5.5	1 280	1 756	-0.95
14	430	0.089 401	0.000 763	0.002 336	0.000 011	0.282 398	0.000 020	0.282 379	-13.2	-4.4	1 252	1 691	-0.93
19	430	0.114 150	0.000 646	0.002 936	0.000 005	0.282 418	0.000 020	0.282 394	-12.5	-3.9	1 244	1 659	-0.91
20	430	0.055 549	0.000 234	0.001 602	0.000 007	0.282 356	0.000 019	0.282 343	-14.7	-5.7	1 287	1 773	-0.95
21	430	0.105 908	0.000 225	0.003 098	0.000 009	0.282 352	0.000 020	0.282 327	-14.9	-6.3	1 347	1 808	-0.91
22	2 478	0.012 840	0.000 102	0.000 351	0.000 001	0.280 866	0.000 022	0.280 850	-67.4	-12.5	3 258	3 741	-0.99
24	430	0.051 931	0.000 328	0.001 396	0.000 005	0.282 395	0.000 019	0.282 384	-13.3	-4.3	1 224	1 681	-0.96
25	430	0.082 134	0.000 529	0.002 271	0.000 007	0.282 371	0.000 018	0.282 352	-14.2	-5.4	1 289	1 751	-0.93
26	430	0.074 011	0.000 788	0.002 015	0.000 021	0.282 306	0.000 015	0.282 289	-16.5	-7.6	1 374	1 891	-0.94
XD116片麻状二长花岗岩
1	426	0.090 592	0.000 430	0.002 550	0.000 019	0.282 365	0.000 025	0.282 344	-14.4	-5.8	1 308	1 772	-0.92
3	426	0.088 711	0.000 297	0.002 339	0.000 001	0.282 414	0.000 023	0.282 395	-12.7	-4.0	1 229	1 659	-0.93
5	426	0.079 828	0.000 158	0.001 987	0.000 006	0.282 292	0.000 021	0.282 276	-17.0	-8.2	1 392	1 923	-0.94
7	426	0.069 911	0.000 124	0.001 829	0.000 004	0.282 243	0.000 024	0.282 228	-18.7	-9.9	1 457	2 030	-0.94
10	426	0.082 954	0.000 305	0.002 465	0.000 007	0.282 317	0.000 018	0.282 297	-16.1	-7.4	1 375	1 877	-0.93
12	426	0.079 391	0.000 204	0.002 372	0.000 001	0.282 388	0.000 019	0.282 369	-13.6	-4.9	1 268	1 717	-0.93
13	426	0.062 828	0.000 131	0.001 868	0.000 006	0.282 307	0.000 015	0.282 292	-16.4	-7.6	1 367	1 888	-0.94
14	426	0.071 541	0.000 327	0.002 283	0.000 012	0.282 302	0.000 015	0.282 283	-16.6	-7.9	1 390	1 907	-0.93
17	426	0.028 967	0.000 198	0.000 994	0.000 010	0.282 244	0.000 021	0.282 236	-18.7	-9.6	1 423	2 012	-0.97
18	426	0.067 351	0.000 377	0.002 007	0.000 008	0.282 357	0.000 018	0.282 341	-14.7	-5.9	1 300	1 779	-0.94
19	426	0.085 447	0.000 076	0.002 569	0.000 006	0.282 374	0.000 018	0.282 354	-14.1	-5.4	1 295	1 751	-0.92
22	426	0.050 115	0.000 113	0.001 400	0.000 004	0.282 337	0.000 021	0.282 325	-15.4	-6.4	1 308	1 814	-0.96
24	426	0.110 760	0.000 780	0.002 641	0.000 006	0.282 356	0.000 025	0.282 335	-14.7	-6.1	1 324	1 793	-0.92
25	426	0.102 138	0.000 206	0.003 343	0.000 009	0.282 401	0.000 022	0.282 375	-13.1	-4.7	1 283	1 704	-0.90
26	866	0.076 960	0.000 569	0.002 191	0.000 008	0.282 391	0.000 017	0.282 356	-13.5	-4.4	1 257	1 468	-0.93
XD119片麻状二长花岗岩
1	433	0.079 435	0.000 308	0.002 407	0.000 003	0.282 436	0.000 021	0.282 417	-11.9	-3.0	1 199	1 606	-0.93
2	433	0.070 819	0.000 200	0.001 919	0.000 001	0.282 377	0.000 022	0.282 361	-14.0	-5.0	1 268	1 730	-0.94
6	433	0.054 695	0.000 511	0.001 532	0.000 012	0.282 265	0.000 018	0.282 252	-17.9	-8.9	1 414	1 972	-0.95
7	433	0.089 013	0.000 088	0.002 422	0.000 006	0.282 335	0.000 019	0.282 315	-15.5	-6.7	1 347	1 833	-0.93
9	433	0.092 948	0.000 404	0.002 662	0.000 007	0.282 359	0.000 017	0.282 337	-14.6	-5.9	1 321	1 783	-0.92
11	433	0.051 088	0.000 153	0.001 522	0.000 002	0.282 314	0.000 017	0.282 302	-16.2	-7.1	1 344	1 862	-0.95
14	433	0.076 518	0.000 960	0.002 097	0.000 006	0.282 348	0.000 026	0.282 331	-15.0	-6.1	1 316	1 797	-0.94
19	433	0.067 505	0.000 345	0.001 859	0.000 005	0.282 307	0.000 017	0.282 292	-16.4	-7.5	1 366	1 884	-0.94
21	433	0.059 126	0.000 520	0.001 571	0.000 008	0.282 445	0.000 017	0.282 432	-11.6	-2.5	1 160	1 572	-0.95
23	433	0.085 994	0.000 566	0.002 281	0.000 023	0.282 361	0.000 019	0.282 343	-14.5	-5.7	1 303	1 771	-0.93
24	433	0.076 930	0.000 667	0.001 923	0.000 024	0.282 327	0.000 024	0.282 311	-15.8	-6.8	1 341	1 842	-0.94
25	433	0.051 971	0.000 231	0.001 353	0.000 003	0.282 206	0.000 019	0.282 195	-20.0	-10.9	1 490	2 099	-0.96
26	433	0.081 162	0.000 473	0.002 203	0.000 005	0.282 382	0.000 017	0.282 364	-13.8	-4.9	1 271	1 724	-0.93

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表 3 宁潭岩体主量元素、微量元素分析结果

Table 3. Major and trace element results of the Ningtan pluton

样品	XD115	XD116	XD119	老虎头单元	陈冲单元	亭子单元	马田单元
SiO₂	75.95	76.13	75.03	75.19	71.00	75.07	72.80
Al₂O₃	12.41	12.68	12.90	13.26	15.04	13.49	14.43
Fe₂O₃	0.16	0.29	0.31	0.54	0.67	0.54	0.73
FeO	2.51	2.27	2.78	1.51	2.34	1.45	2.05
CaO	1.06	0.62	0.70	0.98	1.28	1.17	2.00
MgO	0.24	0.19	0.22	0.13	0.59	0.31	0.79
K₂O	4.67	4.45	4.64	4.67	5.46	4.61	3.26
Na₂O	2.36	2.63	2.57	2.50	2.48	2.60	2.26
TiO₂	0.12	0.09	0.10	0.08	0.25	0.11	0.24
P₂O₅	0.10	0.13	0.13	0.16	0.13	0.19	0.16
MnO	0.06	0.07	0.08	0.06	0.06	0.05	0.05
灼失	0.05	0.17	0.20	0.63	0.66	0.65	0.56
总量	99.68	99.73	99.65	99.71	99.96	100.24	99.33
La	16.80	8.79	12.60	19.00	33.40	22.05	33.80
Ce	35.6	19.8	28.0	39.7	75.2	44.0	64.2
Pr	4.15	2.33	3.30	3.91	6.47	4.48	6.00
Nd	15.40	8.69	12.20	13.30	22.95	14.20	22.00
Sm	4.22	2.58	3.66	3.91	6.72	4.23	5.22
Eu	0.40	0.20	0.24	0.37	0.73	0.44	1.25
Gd	4.12	2.39	3.50	5.13	7.31	5.13	3.43
Tb	0.93	0.62	0.84	0.93	1.30	0.88	0.65
Dy	6.30	4.74	6.23	6.04	8.78	5.91	4.64
Ho	1.27	0.98	1.28	1.30	1.92	1.29	0.98
Er	3.40	2.80	3.62	3.69	5.52	3.83	2.58
Tm	0.52	0.48	0.62	0.56	0.75	0.57	0.37
Yb	3.29	3.30	4.16	3.26	4.57	3.39	2.29
Lu	0.42	0.42	0.54	0.49	0.71	0.51	0.34
Y	33.10	25.00	32.40	34.70	50.65	36.30	23.60
(La/Yb)_N	3.66	1.91	2.17	4.18	5.24	4.67	10.59
δEu	0.29	0.24	0.20	0.25	0.32	0.29	0.85
Cr	27.7	27.2	41.2	5.0	6.5	5.0	16.0
Ni	4.87	4.80	6.75	3.00	5.00	3.00	7.00
Co	2.20	1.74	2.16	2.00	6.50	7.00	6.00
Rb	267.0	360.0	356.0	269.0	278.5	287.0	160.0
Cs	14.3	16.2	14.4	11.8	12.7	15.3	11.8
Sr	40.4	24.4	23.4	49.0	90.5	59.0	160.0
Ba	191	86.4	80.8	280.0	645.0	335.0	870.0
V	6.43	4.20	5.18	16.00	3 105.00	22.00	39.00
Sc	5.02	5.40	5.28
Nb	7.57	8.92	10.10	7.80	12.50	9.30	7.20
Ta	1.64	1.98	2.10	0.88	1.20	0.83	0.71
Zr	84.1	63.2	67.8
Hf	3.58	3.08	3.20
Be	4.36	4.82	4.60	4.60	4.20	6.60	3.90
Ga	13.7	15.4	15.6
U	8.85	6.46	11.40
Th	11.70	9.64	11.40
注：老虎头、陈冲、亭子和马田单元根据陆济璞和蔡贺清(2002).

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表 4 宁潭岩体Rb-Sr、Sm-Nd同位素分析结果

Table 4. Rb-Sr and Sm-Nd isotopic data of the Ningtan pluton

样号	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	(⁸⁷Sr/⁸⁶Sr)_i	Sm(10^-6)	Nd(10^-6)	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	ε_Nd(t)	T_DM1(Ma)	T_DM2(Ma)
XD115	263.7	38.24	20.15	0.841 83	0.718 42	4.22	16.14	0.158 0	0.512 10	-8.4	2 861	1 848
XD116	346.0	23.64	43.34	0.979 67	0.716 70	2.42	8.55	0.171 6	0.512 15	-8.1	3 594	1 826
XD119	344.0	23.03	44.24	0.984 15	0.711 30	3.26	11.67	0.169 1	0.512 15	-8.1	3 411	1 827

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