浙南加里东期龙泉岩体年代学、地球化学特征及其地质意义

刘远栋; 苏小浪; 程海艳; 张建芳; 李翔; 刘风龙

doi:10.12090/j.issn.1006-6616.2021093

浙南加里东期龙泉岩体年代学、地球化学特征及其地质意义

doi: 10.12090/j.issn.1006-6616.2021093

1.
浙江省地质调查院，浙江杭州 311203
2.
杭州金田工程设计咨询有限公司，浙江杭州 311203

基金项目:

浙江省级基础性公益性战略性地质工作专项资金项目 2018006

中国地质调查局地质调查项目 12120114043101

详细信息

作者简介:
刘远栋(1986—)，男，硕士，工程师，主要从事区域地质矿产调查、地质遗迹调查工作。E-mail：lyd661106@163.com

通讯作者:
张建芳(1985—)，男，硕士，高级工程师，从事区域地质、矿产地质调查研究。E-mail：zhjianfang@126.com

中图分类号: P588.12+1
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出版历程
- 收稿日期: 2021-07-27
- 修回日期: 2021-12-24

Geochronological and geochemical characteristics of the Caledonian Longquan pluton in southern Zhejiang, and their geological significance

1.
Zhejiang Institute of Geological Survey, Hangzhou 311203, Zhejiang, China
2.
Hangzhou Jintian Engineering Design Consulting Co. Ltd, Hangzhou 311203, Zhejiang, China

Funds:

the Special Fund Project of Basic Public Welfare Strategic Geological Work of Zhejiang Province 2018006

the Geological Project of the China Geological Survey 12120114043101

摘要

摘要: 龙泉岩体是浙南地区少有的加里东期花岗质岩体。岩石学、地球化学和年代学研究显示，龙泉岩体由花岗岩-二长花岗岩组合(花岗岩类)和英云闪长岩-奥长花岗岩-花岗闪长岩组合(TTG)组成，两类岩石组分普遍富集大离子亲石元素Rb、Ba、Th、U、K，亏损高场强元素Nb、Ta、P、Ti，显示岛弧岩浆岩的特征。TTG岩石的地球化学特征显示属于典型的高压型TTG，其岩浆来源于受俯冲板片流体作用的基性下地壳的重熔作用，而花岗岩类岩石则主要源于古老地壳沉积物的部分熔融，两者均未受地幔的明显混染。锆石SHRIMP U-Pb和锆石LA-ICP-MS U-Pb测年结果表明龙泉岩体的形成时间为443±3~410±3 Ma，结合岩石地球化学特征，指示晚至泥盆纪早期，龙泉地区还存在着洋壳的俯冲作用。
- TTG /
- 锆石U-Pb年龄 /
- 加里东期 /
- 龙泉岩体
Abstract: The Longquan pluton is a rare Caledonian granitic rock mass in southern Zhejiang. Studies on the Longquan pluton using petrology, geochemistry, and chronology were conducted in this paper, which reveal that it is composed of granite-monzogranite assemblage (granitoid) and tonalite-trondhjemite-granodiorite assemblage (TTG). The two types of rocks are generally enriched in large ion lithophile elements Rb, Ba, Th, U and K, and depleted in high field strength elements Nb, Ta, P and Ti, showing the characteristics of island arc magmatic rocks. The geochemical characteristics of the TTG rocks show that they belong to the typical high-pressure type TTG, and its magma originated from the remelting of the basic lower crust under the action of subducted slab fluid. While the granitoids were mainly derived from partial melting of ancient crustal sediments. Neither of them was significantly contaminated by mantle. The zircon SHRIMP U-Pb and LA-ICP-MS U-Pb dating results show that the Longquan pluton was formed between 443±3 Ma~410±3 Ma. Combined with its petrological and geochemical characteristics, it is indicated that the subduction of oceanic crust had still existed in the Longquan area until early Devonian.
- TTG /
- Zircon U-Pb age /
- Caledonian /
- Longquan pluton
注释:

责任编辑: 范二平

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图 1 龙泉岩体地质简图

a-研究区大地构造位置图；b-龙泉岩体地质简图

Figure 1. Geological sketch map of the Longquan pluton

(a)Tectonic map of the study area; (b)Geological sketch map of the Longquan pluton

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图 2 龙泉岩体不同岩石类型接触关系及野外照片

a-花岗闪长岩侵入二长花岗岩中；b-花岗闪长岩中的花岗岩包体；c-细粒花岗岩；d-中细粒英云闪长岩

Figure 2. Field photos showing the contact relationship among different rock types of the Longquan pluton

(a) Granodiorite intruded into monzogranite; (b) Granite inclusions in granodiorites; (c) Fine grained granite; (d) Medium-fine grained tonalite

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图 3 龙泉岩体主量元素岩石分类与岩石系列划分图解

a-TAS图解(Middlemost，1994；1-橄榄辉长岩；2a-碱性辉长岩；2b-亚碱性辉长岩；3-辉长闪长岩；4-闪长岩；5-花岗闪长岩；6-花岗岩；7-硅英岩；8-二长辉长岩；9-二长闪长岩；10-二长岩；11-石英二长岩；12-正长岩；13-副长石辉长岩；14-副长石二长闪长岩；15-副长石二长正长岩；16-副长正长岩；17-副长深成岩；18-霓方钠岩/磷霞岩/粗白榴岩；Ir-Irvine分界线，上方为碱性，下方为亚碱性)；b-An-Ab-Or图解(图中分区据O′Connor，1965)；c-A/CNK-A/NK图解(Rickwood，1989)；d-AFM图解(Irvine and Barager, 1971)；e-AR-SiO₂图解(Wright，1969)；f-SiO₂-K₂O图解(Morrison，1980)

Figure 3. Diagrams showing the rock classification and rock series based on the major elements in the Longquan pluton

(a) TAS plot (Middlemost, 1994; 1-olivine gabbro; 2a-alkaline gabbro; 2b-subalkaline gabbro; 3-gabbro diorite; 4-diorite; 5-granodiorite; 6-granite; 7-quartzolite; 8-monzogabbro; 9-monzodiorite; 10-monzonite; 11-adamellite; 12-syenite; 13-foid gabbro; 14-foid monzodiorite; 15-foid monzosyenite; 16-foid syenite; 17-foid plutonite; 18-tawite/urtite/italite; Ir-Irvine boundary, upper is basic, lower is alkaline); (b) An-Ab-Or plot (O′Connor, 1965); (c) A/CNK-A/NK plot (Rickwood, 1989); (d) AFM plot (Irvine and Barager, 1971); (e) AR-SiO₂ plot (Wright, 1969); (f) SiO₂-K₂O plot(Morrison, 1980)

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图 4 龙泉岩体微量元素原始地幔标准化蛛网图

a-花岗岩类; b-TTG岩类

Figure 4. Primitive mantle-normalized trace element spidergrams for the Longquan pluton

(a) Granite; (b) TTG

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图 5 龙泉岩体稀土元素球粒陨石标准化分布型式图

a-花岗岩类; b-TTG岩类

Figure 5. Chondrite-normalized REE pattern diagrams for the Longquan pluton

(a) Granite; (b) TTG

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图 6 龙泉岩体各类岩石锆石阴极发光图像

Figure 6. Zircon cathodoluminescence image of various rocks in the Longquan pluton

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图 7 龙泉岩体各类岩石锆石U-Pb年龄谐和图

Figure 7. Zircon U-Pb age concordant diagram of various rocks in the Longquan pluton

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图 8 龙泉岩体成因类型判别图解

a-岩石Y-Sr/Y判别图解；b-C/MF-A/MF图解(Altherr et al，2000)；c-SiO₂-Mg^#图解；d-(Na₂O+K₂O+FeO^T+MgO+TiO₂)-(Na₂O+K₂O)/(FeO^T+MgO+TiO₂)图解(Patiño Douce, 1999)；e-(CaO+FeO^T+MgO+TiO₂)-CaO/(FeO^T+MgO+TiO₂)图解(Patiño Douce, 1999)；f-SiO₂-MgO图解(邓晋福等，2010；HMA-高镁安山岩，MA-镁安山岩；PQ-高镁/低镁界线，RS-低镁/非镁界线)

Figure 8. Discrimination diagrams showing the genetic type of the Longquan pluton

(a) Y-Sr/Y plot; (b) C/MF-A/MF plot (Altherr et al, 2000); (c) SiO₂-Mg^#plot; (d) (Na₂O+K₂O+FeO^T+MgO+TiO₂)-(Na₂O+K₂O)/(FeO^T+MgO+TiO₂) plot (Patiño Douce, 1999); (e) (CaO+FeO^T+MgO+TiO₂)-CaO/(FeO^T+MgO+TiO₂) plot (Patiño Douce, 1999); (f) SiO₂-MgO plot (Deng et al.; 2010; HMA-High Magnesium andesite, MA-Magnesium andesite; PQ-Boundary of HMA/MA; RS-Boundary of MA/non-MA)

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图 9 龙泉岩体t-ε_Nd(t)图解

(据沈渭洲等，2008；DM-亏损地幔，CHUR-球粒陨石均一化源区)

Figure 9. Diagram in terms of t-ε_Nd(t) for the Longquan pluton

(modified after Shen et al, 2008; DM-Deficit mantle, CHUR-chondrite uniform reservoir)

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图 10 龙泉岩体Rb-(Nb+Y)图解和Rb-(Yb+Ta)图解(Pearce et al., 1984)

VAG-火山弧花岗岩；ORG-洋脊花岗岩；WPG-板内花岗岩；syn-COLG-同碰撞花岗岩
a-Rb-(Nb+Y)图解；b-Rb-(Yb+Ta)图解

Figure 10. Rb-(Nb+Y) diagram and Rb-(Yb+Ta) diagram for the Longquan pluton (Pearce et al., 1984)

(a) Rb-(Nb+Ta) diagram; (b) Rb-(Yb+Ta) diagram
VAG-Volcanic arc granite; ORG-Ocean ridge granite; WPG-Within plate granite; syn-COLG-syn-collisional granite

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表 1 龙泉岩体花岗岩类和TTG主量元素(%)、微量元素(×10^-6)、稀土元素(×10^-6)丰度表

Table 1. Major elements (%), trace and rare earth elements (10^-6) of the Longquan granitoids and TTG rocks

样号	PM002-9	PM002-22	D0418	D0382	PM002-36	PM002-15	D0380	PM002-37	D0016	D0470	D2172-1	D2172-2	*JS151	*JS155	*JS157
岩石类型	花岗岩				二长花岗岩	石英二长岩		英云闪长岩		奥长花岗岩			花岗闪长岩		花岗岩
SiO₂	70.49	72.58	74.09	67.79	72.99	66.04	65.75	63.87	66.17	71.61	68.27	66.34	71.24	60.71	72.25
TiO₂	0.37	0.24	0.09	0.07	0.14	0.61	0.62	0.76	0.67	0.35	0.44	0.30	0.30	0.70	0.20
Al₂O₃	15.27	14.26	13.58	17.49	14.48	16.71	12.04	17.03	15.05	15.18	13.56	16.32	14.38	15.17	13.97
Fe₂O₃	1.88	0.85	0.13	0.30	0.60	3.77	2.09	1.35	0.92	1.31	0.60	1.20	0.89	1.98	0.68
FeO	1.04	1.11	0.54	0.44	0.50	0.61	2.13	3.34	3.20	1.39	2.35	1.30	1.29	3.27	0.80
MnO	0.05	0.05	0.03	0.02	0.03	0.09	0.07	0.10	0.09	0.07	0.05	0.09	0.05	0.08	0.03
MgO	0.49	0.30	0.25	0.19	0.39	0.89	1.30	1.89	1.73	0.54	1.07	0.44	0.89	5.01	0.66
CaO	1.25	0.92	1.09	0.53	0.44	1.28	2.64	3.93	3.98	0.52	3.48	2.70	2.16	2.14	1.07
Na₂O	3.98	3.70	3.62	4.34	4.25	2.83	5.88	3.50	3.75	4.35	4.75	5.46	4.07	3.51	4.00
K₂O	3.73	4.98	5.18	6.51	4.52	4.61	4.10	1.85	2.03	2.19	1.37	2.29	2.42	2.43	4.35
P₂O₅	0.09	0.07	0.02	0.02	0.03	0.19	0.22	0.25	0.21	0.12	0.16	0.17	0.12	0.10	0.07
LOI	1.17	0.78	1.07	0.95	0.85	2.21	2.83	1.68	1.74	1.62	3.46	2.94	1.16	5.00	1.38
Rb	104.00	98.30	139.00	188.00	138.00	170.00	108.00	98.50	85.00	122.00	65.90	102.00	63.05	85.81	94.96
Ba	1424.00	2294.00	899.00	961.00	1559.00	1311.00	786.00	628.00	903.00	588.00	389.00	331.00	1568.18	674.01	1433.00
Th	18.60	16.60	15.40	18.60	16.50	13.10	9.95	8.81	8.40	7.18	7.68	5.38	15.10	8.62	11.40
U	0.60	0.93	1.92	1.58	2.65	2.17	1.56	1.64	1.15	1.09	0.96	2.29	1.92	1.24	0.82
Ta	0.38	0.18	7.05	0.51	0.29	0.92	0.87	1.29	0.51	0.98	0.44	2.57	0.38	0.48	0.22
Nb	10.90	6.60	35.00	6.91	4.86	18.50	11.60	14.90	9.80	10.90	5.59	19.70	7.49	7.57	5.80
Sr	191.00	279.00	177.00	261.00	204.00	262.00	417.00	415.00	468.00	284.00	320.00	198.00	472.47	344.36	359.80
Zr	290.00	165.00	62.10	180.00	119.00	303.00	192.00	222.00	170.00	164.00	194.00	141.00	196.91	194.16	159.00
Hf	7.85	4.81	2.74	6.18	3.53	9.02	4.67	8.69	7.47	3.84	5.02	3.47	4.38	4.73	4.19
Cr	4.18	5.15	3.20	0.34	5.40	3.71	6.06	24.00	21.10	7.61	11.20	8.10	8.79	240.59	6.23
Ni	3.50	3.80	2.90	0.79	4.80	5.60	3.02	8.60	9.90	6.41	5.03	6.01	3.16	134.76	2.14
Co	3.01	2.06	2.00	0.91	3.50	3.14	4.99	10.20	9.57	4.74	6.55	3.88	3.98	21.26	2.39
V	43.50	45.90	22.10	16.30	36.60	45.70	48.40	81.90	78.70	30.30	34.80	22.80	27.60	98.92	17.00
Sc	3.00	2.18	1.57	1.72	2.16	12.10	3.38	10.40	7.97	3.85	3.88	3.65	4.12	13.70	2.95
Cs	1.82	1.22	2.57	2.43	1.99	3.55	6.53	5.14	2.04	3.57	3.67	5.43	1.74	1.52	2.12
Cd	0.04	0.04	0.02	0.30	0.03	0.14	0.26	0.07	0.03	0.29	0.03	0.30
Li	12.60	9.44	8.49	8.46	11.10	22.80	13.40	62.00	25.00	22.90	25.10	17.10
Y	7.78	6.24	12.40	8.94	5.15	35.00	8.53	20.00	9.51	9.65	3.87	8.93	7.17	13.38	5.51
La	72.20	59.90	25.80	24.80	25.20	50.10	29.70	22.20	33.00	25.20	35.40	14.90	45.80	37.69	27.90
Ce	120.00	82.40	48.80	44.00	46.60	99.60	53.60	41.50	56.90	36.00	60.40	27.00	73.60	69.09	46.70
Pr	12.60	9.27	5.43	4.92	5.63	11.30	5.45	4.77	5.81	4.42	6.03	2.80	6.80	7.02	4.47
Nd	46.50	33.20	19.50	18.50	20.10	50.50	20.30	18.60	23.60	16.50	21.60	11.00	21.60	25.37	14.70
Sm	6.19	4.09	3.72	3.31	3.17	9.68	3.25	3.82	3.80	2.82	3.03	2.18	3.23	4.09	2.45
Eu	1.15	0.82	0.60	0.87	0.82	1.84	0.89	1.10	0.87	0.87	0.77	0.61	0.88	0.97	9.67
Gd	3.47	2.38	3.00	3.15	2.21	7.58	3.31	3.83	2.70	2.99	1.94	2.40	2.27	3.05	1.65
Tb	0.42	0.31	0.46	0.33	0.26	1.26	0.34	0.65	0.42	0.34	0.20	0.31	0.28	0.40	0.23
Dy	1.70	1.36	2.33	1.80	1.26	6.74	1.88	3.82	1.98	1.99	0.86	1.84	1.26	2.50	1.10
Ho	0.28	0.23	0.43	0.31	0.20	1.30	0.32	0.72	0.36	0.34	0.14	0.29	0.25	0.55	0.19
Er	0.72	0.63	1.10	1.00	0.43	3.54	1.04	1.96	0.95	1.07	0.35	0.88	0.62	1.57	0.50
Tm	0.08	0.08	0.17	0.13	0.06	0.48	0.13	0.31	0.13	0.13	0.05	0.11	0.10	0.23	0.07
Yb	0.55	0.54	1.04	0.99	0.36	3.08	0.93	1.79	0.79	0.89	0.30	0.80	0.67	1.56	0.50
Lu	0.09	0.09	0.15	0.15	0.05	0.43	0.13	0.24	0.13	0.12	0.04	0.11	0.10	0.23	0.08
δEu	0.69	0.74	0.53	0.81	0.90	0.63	0.82	0.87	0.79	0.91	0.91	0.81	0.94	0.80	0.96
δCe	0.90	0.77	0.96	0.92	0.92	0.99	0.96	0.94	0.93	0.77	0.93	0.96	0.91	0.97	0.93
注：标记为“*”的样品引自《1∶25万衢州幅区域地质调查报告》(浙江省地质调查院，2013)

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表 2 龙泉岩体LA-ICP-MS锆石U-Pb测年结果

Table 2. LA-ICP-MS Zircon U-Pb dating for the Longquan felsic rocks

样品号及岩性	测点号	Th²³²/×10^-6	U²³⁸/×10^-6	Th/U	同位素比值						同位素年龄/Ma
样品号及岩性	测点号	Th²³²/×10^-6	U²³⁸/×10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
D0382花岗岩	1	422	1338	0.31	0.0546	0.0008	0.5286	0.0087	0.0702	0.0010	395	33	431	6	438	6
	2	458	1379	0.33	0.0551	0.0008	0.5484	0.0094	0.0722	0.0010	417	35	444	6	449	6
	3	1344	3249	0.41	0.0568	0.0008	0.5505	0.0089	0.0704	0.0010	482	32	445	6	438	6
	4	610	1604	0.38	0.0550	0.0007	0.5411	0.0084	0.0714	0.0010	412	30	439	6	444	6
	5	395	1381	0.29	0.0557	0.0009	0.5494	0.0095	0.0716	0.0010	438	35	445	6	446	6
	6	750	1892	0.40	0.0548	0.0009	0.5467	0.0103	0.0724	0.0010	404	39	443	7	450	6
	7	908	2331	0.39	0.0557	0.0008	0.5473	0.0090	0.0713	0.0010	441	33	443	6	444	6
	8	971	2379	0.41	0.0558	0.0009	0.5509	0.0097	0.0716	0.0010	444	36	446	6	446	6
	9	1281	3150	0.41	0.0557	0.0007	0.5471	0.0084	0.0713	0.0010	439	29	443	6	444	6
	10	1319	2874	0.46	0.0556	0.0007	0.5418	0.0080	0.0707	0.0010	435	28	440	5	440	6
	11	487	1608	0.30	0.0550	0.0010	0.5341	0.0107	0.0705	0.0010	411	42	435	7	439	6
	12	732	1487	0.49	0.0552	0.0008	0.5364	0.0085	0.0705	0.0010	421	31	436	6	439	6
	13	1410	3229	0.44	0.0554	0.0007	0.5454	0.0083	0.0714	0.0010	429	29	442	5	444	6
	14	481	1344	0.36	0.0550	0.0008	0.5411	0.0086	0.0713	0.0010	413	31	439	6	444	6
D0380石英二长岩	1	292	787	0.37	0.0543	0.0011	0.5099	0.0104	0.0681	0.0009	384	46	418	7	425	6
	2	592	612	0.97	0.0553	0.0010	0.5113	0.0095	0.0670	0.0009	426	41	419	6	418	5
	3	199	222	0.90	0.0551	0.0013	0.5093	0.0123	0.0670	0.0010	417	55	418	8	418	6
	4	484	716	0.68	0.0586	0.0017	0.5382	0.0151	0.0667	0.0010	551	64	437	10	416	6
	5	521	518	1.01	0.0552	0.0011	0.5136	0.0101	0.0674	0.0009	422	43	421	7	421	6
	6	247	245	1.01	0.0584	0.0016	0.5151	0.0138	0.0640	0.0010	545	61	422	9	400	6
	7	440	899	0.49	0.0550	0.0009	0.5133	0.0086	0.0677	0.0009	411	35	421	6	422	5
	8	268	296	0.90	0.0549	0.0013	0.5072	0.0117	0.0670	0.0009	408	52	417	8	418	6
	9	212	327	0.65	0.0539	0.0011	0.4949	0.0105	0.0666	0.0009	369	48	408	7	415	6
	10	372	424	0.88	0.0547	0.0012	0.5082	0.0115	0.0674	0.0010	398	51	417	8	421	6
	11	301	517	0.58	0.0544	0.0010	0.5055	0.0096	0.0674	0.0009	389	42	415	6	420	5
	12	291	276	1.05	0.0544	0.0015	0.5047	0.0135	0.0673	0.0010	388	62	415	9	420	6
PM002-36二长花岗岩	1	367	271	1.35	0.0525	0.0017	0.5105	0.0159	0.0705	0.0011	307	73	419	11	439	6
	2	431	341	1.27	0.0551	0.0013	0.5259	0.0124	0.0692	0.0010	417	53	429	8	431	6
	3	243	244	1.00	0.0549	0.0021	0.5287	0.0199	0.0698	0.0012	409	88	431	13	435	7
	4	385	286	1.34	0.0554	0.0013	0.5265	0.0124	0.0689	0.0010	428	54	429	8	430	6
	5	190	188	1.01	0.0560	0.0015	0.5348	0.0146	0.0692	0.0010	454	62	435	10	431	6
	6	438	492	0.89	0.0559	0.0015	0.5289	0.0144	0.0687	0.0010	446	63	431	10	428	6
	7	262	266	0.98	0.0550	0.0012	0.5274	0.0118	0.0695	0.0009	413	51	430	8	433	6
	8	174	176	0.99	0.0545	0.0038	0.5232	0.0346	0.0695	0.0017	393	159	427	23	433	10
	9	376	262	1.44	0.0550	0.0013	0.5220	0.0120	0.0688	0.0009	413	52	426	8	429	6
	10	429	331	1.29	0.0548	0.0012	0.5210	0.0117	0.0689	0.0009	404	51	426	8	430	6
	11	77	79	0.97	0.0552	0.0033	0.5244	0.0305	0.0689	0.0014	421	137	428	20	429	9
	12	629	355	1.77	0.0551	0.0013	0.5250	0.0126	0.0691	0.0010	417	55	428	8	430	6
	13	181	200	0.90	0.0566	0.0018	0.5412	0.0173	0.0693	0.0011	475	74	439	11	432	6
	14	505	529	0.95	0.0558	0.0010	0.5342	0.0103	0.0694	0.0009	445	42	435	7	433	6
	15	82	183	0.45	0.0545	0.0017	0.5180	0.0161	0.0689	0.0010	391	73	424	11	430	6
PM002-37英云闪长岩	1	60	91	0.66	0.0557	0.0019	0.6036	0.0199	0.0786	0.0012	439	76	479	13	488	7
	2	191	974	0.20	0.0550	0.0008	0.5116	0.0084	0.0674	0.0009	414	35	420	6	421	5
	3	92	61	1.51	0.0563	0.0028	0.5279	0.0261	0.0681	0.0012	463	115	430	17	424	7
	4	65	920	0.07	0.0827	0.0010	2.3563	0.0331	0.2066	0.0026	1263	25	1229	10	1211	14
	5	101	134	0.76	0.0561	0.0022	0.5227	0.0198	0.0676	0.0011	457	88	427	13	421	7
	6	842	1322	0.64	0.0560	0.0010	0.5313	0.0099	0.0688	0.0009	453	41	433	7	429	6
	7	363	912	0.40	0.0981	0.0012	3.6321	0.0502	0.2687	0.0034	1587	23	1557	11	1534	17
	8	286	213	1.34	0.2453	0.0030	20.3636	0.2833	0.6023	0.0078	3154	20	3109	13	3039	31
	9	409	266	1.54	0.0555	0.0016	0.5173	0.0144	0.0676	0.0010	434	64	423	10	421	6
	10	153	470	0.32	0.1535	0.0032	8.5164	0.1384	0.4025	0.0051	2385	36	2288	15	2180	23
	11	61	98	0.62	0.0670	0.0015	1.2758	0.0281	0.1381	0.0020	838	46	835	13	834	11
	12	89	108	0.82	0.0624	0.0015	1.0380	0.0251	0.1207	0.0017	688	52	723	12	734	10
	13	217	147	1.48	0.0555	0.0019	0.5175	0.0173	0.0677	0.0011	430	77	423	12	422	6
	14	1137	478	2.38	0.0564	0.0013	0.5265	0.0124	0.0677	0.0010	469	53	429	8	422	6
	15	191	411	0.46	0.0544	0.0013	0.5084	0.0119	0.0677	0.0010	389	53	417	8	423	6
	16	112	80	1.41	0.0549	0.0040	0.5164	0.0363	0.0682	0.0017	409	167	423	24	425	10
	17	445	248	1.79	0.0548	0.0014	0.5162	0.0130	0.0683	0.0010	404	57	423	9	426	6
	18	738	832	0.89	0.0549	0.0011	0.5185	0.0105	0.0685	0.0009	409	45	424	7	427	6
	19	922	936	0.99	0.0551	0.0015	0.5158	0.0137	0.0680	0.0010	414	61	422	9	424	6
	20	204	120	1.70	0.0548	0.0030	0.5197	0.0273	0.0688	0.0014	404	125	425	18	429	9

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表 3 龙泉岩体SHRIMP锆石U-Pb测年结果

Table 3. SHRIMP Zircon U-Pb dating of Longquan felsic rocks

样品号及岩性	测点号	²⁰⁶Pb_c/%	U/×10^-6	Th/×10^-6	²³²Th/²³⁸U	²⁰⁶Pb^*/×10^-6	年龄/Ma						同位素比值
样品号及岩性	测点号	²⁰⁶Pb_c/%	U/×10^-6	Th/×10^-6	²³²Th/²³⁸U	²⁰⁶Pb^*/×10^-6	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb^/²⁰⁶Pb^	±/%	²⁰⁷Pb^*/²³⁵U	±/%	²⁰⁶Pb^*/²³⁸U	±/%	error
D0016英云闪长岩	1	0.38	126	56	0.46	7.9	449	11	323	98	391	19	0.0529	4.3	0.526	5.0	0.0721	2.6	0.516
	2	0.00	353	354	1.04	21.3	437	10	357	43	425	12	0.0537	1.9	0.519	3.1	0.0702	2.5	0.791
	3.1	0.17	194	230	1.22	11.6	433	11	330	65	425	13	0.0530	2.9	0.508	3.8	0.0695	2.6	0.667
	3.2	0.42	145	133	0.95	9.3	464	12	514	71	478	16	0.0576	3.2	0.592	4.1	0.0746	2.6	0.627
	4	0.18	303	360	1.23	18.4	440	11	371	50	437	12	0.0540	2.2	0.526	3.3	0.0706	2.5	0.746
	5	0.00	180	35	0.20	11.1	448	11	361	66	413	18	0.0538	2.9	0.533	3.9	0.0719	2.5	0.656
	6	0.14	351	266	0.78	20.9	432	10	368	71	420	13	0.0539	3.1	0.515	4.0	0.0692	2.5	0.620
	7	0.15	261	65	0.26	15.9	442	13	360	54	412	18	0.0537	2.4	0.526	3.8	0.0710	3.0	0.779
	8	--	364	154	0.44	21.8	435	10	439	42	475	14	0.0557	1.9	0.536	3.1	0.0698	2.5	0.796
	9	0.13	366	390	1.10	22.2	438	11	383	43	427	12	0.0543	1.9	0.527	3.2	0.0704	2.5	0.791
	10	0.00	327	157	0.50	19.0	421	10	467	45	461	24	0.0564	2.0	0.524	3.2	0.0674	2.5	0.773
	11	0.08	412	291	0.73	24.0	422	10	425	41	423	12	0.0553	1.9	0.516	3.1	0.0677	2.5	0.799
D2172奥长花岗岩	1	0.17	233	24	0.11	13.5	421	10	373	97	386	66	0.0540	4.3	0.503	5.0	0.0675	2.5	0.505
	2	0.31	308	225	0.76	18.2	428	10	356	71	425	14	0.0536	3.2	0.507	4.0	0.0686	2.5	0.619
	3	0.07	568	423	0.77	32.5	416	10	379	35	404	11	0.0542	1.6	0.498	2.9	0.0666	2.5	0.845
	4	0.08	457	438	0.99	26.0	413	10	339	39	404	11	0.0533	1.7	0.485	3.0	0.0661	2.4	0.819
	5	0.24	188	128	0.71	11.0	424	10	337	71	419	14	0.0532	3.1	0.498	4.0	0.0679	2.5	0.630
	6	0.18	284	222	0.81	16.5	422	10	332	66	413	13	0.0531	2.9	0.495	3.8	0.0677	2.5	0.653
	7	0.16	410	403	1.02	23.0	407	10	362	46	398	11	0.0538	2.1	0.483	3.2	0.0651	2.5	0.768
	8	1.37	119	84	0.74	6.8	411	11	382	190	379	24	0.0543	8.6	0.492	9.0	0.0658	2.7	0.296
	9	0.17	323	222	0.71	18.4	414	10	341	48	404	12	0.0533	2.1	0.487	3.3	0.0663	2.5	0.758
	10	0.19	238	153	0.66	14.1	429	10	368	60	411	13	0.0539	2.7	0.511	3.7	0.0687	2.5	0.684
	11	0.11	244	229	0.97	14.1	420	10	401	70	410	13	0.0547	3.1	0.508	4.0	0.0673	2.5	0.623
	12	0.19	700	80	0.12	39.5	409	10	410	51	435	32	0.0550	2.3	0.497	3.3	0.0656	2.4	0.731
	13	0.08	402	70	0.18	22.5	406	10	461	41	422	27	0.0562	1.9	0.504	3.1	0.0650	2.5	0.797
	14	0.61	165	104	0.65	10.0	439	11	361	130	393	20	0.0538	5.7	0.523	6.2	0.0705	2.6	0.415
注：Pb_c和Pb^*分别代表普通铅和放射性铅

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表 4 龙泉岩体Sr、Nd同位素组成

Table 4. Sr and Nd isotopic compositions of the Longquan pluton

样号	D7008	D7007	D2792	D2797
岩性	英云闪长岩		花岗闪长岩	二长花岗岩
年龄/Ma	413	413	413	415
Rb/×10^-6	64.52	61.97	85.81	90.58
Sr/×10^-6	421.76	491.96	344.36	291.26
⁸⁷Rb/⁸⁶Sr	0.442968	0.364743	0.900465	0.721556
⁸⁷Sr/⁸⁶Sr	0.711387	0.710705	0.712980	0.712475
I_Sr	0.708782	0.708560	0.707658	0.708231
Sm/×10^-6	2.32	3.24	4.09	1.75
Nd/×10^-6	14.46	19.27	25.37	10.97
¹⁴⁷Sm/¹⁴⁴Nd	0.097583	0.102228	0.097202	0.098115
¹⁴³Nd/¹⁴⁴Nd	0.512207	0.512308	0.512230	0.512002
I_Nd	0.511943	0.512032	0.511966	0.511737
ε_Sr(t)	67.7	64.6	51.8	59.9
ε_Nd(t)	-3.2	-1.5	-2.7	-7.2
f_Sm/Nd	-0.50	-0.48	-0.51	-0.50
T_DM/Ma	1239	1153	1205	1514
T_2DM/Ma	1415	1275	1376	1742
注：数据引用自《1∶25万衢州幅区域地质调查报告》(浙江省地质调查院，2013)

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表 5 龙泉岩体同位素年龄一览表

Table 5. Isotopic age table of the Longquan pluton

样号	岩性	岩类	年龄/Ma	测试方法	资料来源
JS151	花岗闪长岩	TTG	410±3	LA-ICP-MS	浙江省地质调查院，2015
D2172	奥长花岗岩		418±5	SHRIMP	此次研究
JS155	花岗闪长岩		419+5	LA-ICP-MS	浙江省地质调查院，2015
PM002-37	英云闪长岩		424±3	LA-ICP-MS	此次研究
D0016	英云闪长岩		437±6	SHRIMP	此次研究
D0380	石英二长岩	花岗岩	418±3	LA-ICP-MS	此次研究
PM002-36	二长花岗岩		432±3	LA-ICP-MS	此次研究
D0382	花岗岩		443±3	LA-ICP-MS	此次研究

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