西藏南木林县拉隆地区花岗闪长岩体的时代、岩石地球化学特征及构造背景

吉雪峰; 魏启荣; 李世杰; 许欢; 王旭东; 陈泰一; 王健; 欧波; 赵闪; 杨长青

doi:10.3799/dqkx.2018.271

西藏南木林县拉隆地区花岗闪长岩体的时代、岩石地球化学特征及构造背景

doi: 10.3799/dqkx.2018.271

1.
中国地质大学资源学院, 湖北武汉 430074
2.
河南省地质调查院, 河南郑州 450001

基金项目:

中国地质调查局项目 DD20160015

详细信息

作者简介:
吉雪峰(1992-), 男, 在读硕士研究生, 主要从事岩浆岩与成矿研究

通讯作者:
魏启荣

中图分类号: P597
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出版历程
- 收稿日期: 2018-07-12
- 刊出日期: 2018-12-15

Geochronology, Geochemistry and Tectonic Settings of Granodiorite in Lalong Area, Namling, Tibet

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Henan Institute of Geological Survey, Zhengzhou 450001, China

摘要

摘要: 冈底斯印支期构造-岩浆-成矿的研究比较缺乏.以出露在冈底斯隆格尔-念青唐古拉复合古岛弧带的拉隆花岗闪长岩体为研究对象，通过野外地质调查、岩石学、LA-ICP-MS锆石U-Pb定年、岩石地球化学和锆石Lu-Hf同位素等方面的研究，探讨了其岩石成因和形成的构造背景.结果显示，拉隆花岗闪长岩体的LA-ICP-MS锆石U-Pb年龄为223.5±3.9 Ma~225.4±4.9 Ma，形成于晚三叠世（T₃），属印支晚期构造-岩浆活动的产物；花岗闪长岩体表现出低Ti（w（TiO₂）=0.46%~0.73%），富Si（w（SiO₂）=63.24%~67.94%）、Al（w（Al₂O₃）=14.14%~15.85%）、Na（w（Na₂O）=2.58%~3.04%）、K（w（K₂O）=3.06%~4.89%），高钾钙碱性-钾玄岩系列和弱过铝质的主量元素地球化学特征；岩体稀土总量∑REE为138.62×10^-6~255.53×10^-6，配分模式为轻稀土元素富集的右倾斜型，其（La/Yb）_N值为8.35~17.90，具明显的负Eu异常（Eu/Eu^*=0.54~0.69），无Ce异常（Ce/Ce^*=0.92~1.02）；微量元素表现出Ba、Nb、Ta、Sr、Ti、P元素亏损和Rb、K、Th、U、Zr、Hf元素富集的特征.岩体的ε_Hf（t）为-6.4~2.5，其两阶段模式年龄t_DM2为980~1 479 Ma，相当于念青唐古拉群形成的地质时代.拉隆花岗闪长岩体属A型花岗岩，为古老下地壳物质部分熔融的岩浆产物，并有少量地幔物质的加入，形成于古特提斯俯冲碰撞形成的岛弧背景下局部拉张的构造环境.
- 拉隆花岗闪长岩体 /
- 锆石U-Pb定年 /
- 地球化学 /
- A型花岗岩 /
- 构造地质学
Abstract: The study on the tectono-magmatic mineralization of the Gangdese Indosinian is relatively deficient. This paper takes Lalong granodiorite masses located in the Gangdese Lunggar-Nyainqentanglha tectono-magmatic belt as the research object. The field geological surveying, petrology, LA-ICP-MS zircon U-Pb dating, geochemistry and Hf isotope data are systematically studied to discuss the petrogenesis and tectonic settings. It is found that the LA-ICP-MS zircon U-Pb ages show a weighted average age between 223.5±3.9 Ma and 225.4±4.9 Ma, indicating that they formed in Late Triassic epoch, and they are probably tectonic-magmatic products of late period of Indosinian. The rocks show low Ti(w(TiO₂)=0.46%-0.73%), rich in Si(w(SiO₂)=63.24%-67.94%), Al(w(Al₂O₃)=14.14%-15.85%), Na(w(Na₂O)=2.58%-3.04%) and K(w(K₂O)=3.06%-4.89%), belonging to the high-K calc-alkaline to shoshonite series and weakly peraluminous; enrichment in REE, and the ΣREE is 138.62×10^-6 to 255.53×10^-6. The rare earth element distribution pattern is the right tilt type of the light rare earth element enrichment, the (La/Yb)_N=8.35-17.90, with negative Eu anomaly (Eu/Eu^*=0.54-0.69) and without Ce anomaly (Ce/Ce^*=0.92-1.02). The rocks show depletion in Ba, Nb, Ta, Sr, Ti and P; enrichment in Rb, K, Th, U, Zr and Hf in the trace elements. The ε_Hf(t)=-6.4-2.5, coinciding with two-phase model age (t_DM2) of the crust of 980-1 479 Ma, and a same geologic age with the Nyainqentanglha Group. Lalong granodiorite masses belong to A-type granite. They are partially melted magmatic products induced by ancient lower crust material, and accompanied by a small amount of mantle material. They are formed by the local extension of the tectonic setting in the island arc environment formed by the ancient Tethys subduction.
- Lalong granodiorite mass /
- zircon U-Pb dating /
- geochemistry /
- A-type granite /
- tectonics

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图 1 冈底斯带岩浆岩分布简图

JSSZ.金沙江缝合带；BNSZ.班公湖-怒江缝合带；YZSZ.雅鲁藏布江缝合带；LMF.沙莫勒-麦拉-洛巴堆-米拉山断裂；GLZCF.噶尔-隆格尔-扎日南木措-措麦断裂带；SNMZ.狮泉河-拉果错-永珠-纳木错-嘉黎蛇绿混杂岩带；STDS.喜马拉雅带藏南拆离系；MCT.主中央逆冲断裂；NG.北冈底斯；MG.中冈底斯；GRUB.冈底斯弧背断隆带；SG.南冈底斯；LH.低喜马拉雅；GH.高喜马拉雅；TH.特提斯喜马拉雅；底图据朱弟成等(2008, 2009).年龄数据据李才等(2003)；和钟铧等(2006)；张宏飞等(2007)；Zhu et al.(2011)；彭建华等(2013)；王程等(2014)；卜涛等(2015)

Fig. 1. Magmatic rock distribution diagram of Gangdese

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图 2 西藏南木林县拉隆地区地质简图

a.据潘桂棠等(2006).Ⅰ.喜马拉雅板块；Ⅱ.冈底斯-念青唐古拉板块(Ⅱ-1.冈底斯-下察隅晚燕山-喜山期岩浆弧带；Ⅱ-2.隆格尔-念青唐古拉复合古岛弧带；Ⅱ-3.革吉-申扎弧后盆地带；Ⅱ-4.它日错-班戈-那曲前陆盆地)；Ⅲ.羌塘板块；YZSZ.雅鲁藏布江缝合带；BNSZ.班公湖-怒江缝合带.1.古新统年波组；2.上石炭统永珠组；3.晚三叠世白云母二长花岗岩；4.晚三叠世花岗闪长岩；5.地质界线；6.角度不整合界线；7.角岩化带；8.性质不明断层；9.正断层；10.岩石地球化学样采样位置；11.同位素年龄样采样位置；12.锆石U-Pb同位素年龄；13.研究区位置；14.产状(°)

Fig. 2. Geologic sketch of Lalong area, Namling, Tibet

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图 3 西藏南木林县拉隆地区剖面

1.含砾石英砂岩；2.花岗闪长岩；3.巨斑似斑状花岗闪长岩；4.黑云母花岗闪长岩；5.闪长岩；6.石英二长岩；7.闪长岩脉；8.云煌岩脉；9.上石炭统永珠组；10.晚三叠世花岗闪长岩；11.晚三叠世黑云母花岗闪长岩；12.晚三叠世闪长岩；13.晚三叠世石英二长岩；14.地质界线；15.岩相分界线；16.采样位置及样品编号；17.硅酸盐样品采集点；18.锆石样品采集点；19.地层产状(°)

Fig. 3. The geogical section of Lalong area, Namling, Tibet

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图 4 西藏南木林县拉隆地区花岗闪长岩野外及显微结构特征

a.中细粒花岗闪长岩; b.巨斑似斑状花岗闪长岩.Qtz.石英；Pl.斜长石；Or.正长石；Amp.角闪石；Bi.黑云母

Fig. 4. Photos of outcrop and microphotographs from Lalong granodiorite masses in Namling, Tibet s

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图 5 西藏南木林县拉隆地区花岗闪长岩体的锆石阴极发光(CL)图像

实线圈为锆石U-Pb测点，直径为32 μm；虚线圈为Lu-Hf测点，直径为44 μm

Fig. 5. CL images of zircon of the Lalong granodiorite masses in Namling, Tibet

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图 6 西藏南木林县拉隆地区花岗闪长岩体的锆石U-Pb年龄谐和图

Fig. 6. U-Pb zircon concordia diagram of the Lalong granodiorite masses in Namling, Tibet

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图 7 西藏南木林县拉隆地区花岗闪长岩体的(Na₂O+K₂O)-SiO₂图(a)、AFM图(b)、K₂O-SiO₂图(c)和A/NK-A/CNK图解(d)

1.橄榄辉长岩; 2.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.似长辉长岩; 14.似长二长闪长岩; 15.似长正长闪长岩; 16.似长正长岩; 17.似长岩; 18.霓方钠岩/磷霞岩/粗白榴岩; A.碱性系列；S.亚碱性系列；Ir(Irvine)分界线据Irvine and Baragar(1971)；TH.拉斑玄武岩系列；CA.钙碱性系列.a.据Cox et al.(1979); b.据Irvine and Baragar(1971)；c.实线据Peccerillo and Taylor (1976), 虚线据Middlemost(1986)；d.据Maniar and Piccoli(1989)

Fig. 7. (Na₂O+K₂O)-SiO₂ (a), AFM (b), K₂O-SiO₂ (c) and A/NK-A/CNK (d) diagrams of the Lalong granodiorite masses in Namling, Tibet

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图 8 西藏南木林县拉隆地区花岗闪长岩体稀土元素配分模式(a)和微量元素比值蛛网图(b)

据Sun and McDonough(1989)

Fig. 8. REE distribution pattern (a) and trace elements spidergram (b) of the Lalong granodiorites in Namling, Tibet

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图 9 西藏南木林县拉隆地区花岗闪长岩体的锆石ε_Hf(t)值和Hf两阶段模式年龄t_DM2值分布

Fig. 9. Zircon ε_Hf(t) value diagrams and Hf two-phase model age (t_DM2) value diagrams of the Lalong granodiorite masses in Namling, Tibet

a.BP07-5-1;b.B1305-1;c.BP07-5-1;d.B1305-1

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图 10 西藏拉隆地区花岗闪长岩体的10 000×Ga/Al-(Zr+Ce+Nb+Y)图解

A.A型花岗岩；FG.分异的长英质I和S型花岗岩类；OGT.未分异I、S和M型花岗岩类；底图据Eby(1990)

Fig. 10. 10 000×Ga/Al-(Zr+Ce+Nb+Y) diagram of the Lalong granodiorite masses in Namling, Tibet

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图 11 西藏拉隆地区花岗闪长岩体的Na₂O-K₂O(a)、FeO^T/MgO-SiO₂(b)、Th-Eu/Eu^*(c)判别图

I.I型花岗岩；S.S型花岗岩；A.A型花岗岩；底图据Collins et al.(1982)

Fig. 11. Na₂O-K₂O (a), FeO^T/MgO-SiO₂ (b), Th-Eu/Eu^* (c) diagrams of the Lalong granodiorite masses in Namling, Tibet

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图 12 西藏南木林县拉隆地区花岗闪长岩体ε_Hf(t)锆石U-Pb年龄(t)图解

CHUR.球粒陨石均一源储(chondrite uniform reservoir)；DM.亏损地幔(depleted mantle)；底图据Yang et al.(2006)

Fig. 12. Age (t) versus ε_Hf(t) values diagram of the Lalong granodiorite massess in Namling, Tibet

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图 13 西藏拉隆地区花岗闪长岩体的Al₂O₃/(MgO+FeO^T)-CaO/(MgO+FeO^T)和La/Sm-La图解

a.据Altherr et al.(2000); b.据Treuil and Joron (1975)

Fig. 13. Al₂O₃/(MgO+FeO^T)-CaO/(MgO+FeO^T) and La/Sm-La diagrams of the Lalong granodiorite masses in Namling, Tibet

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图 14 西藏拉隆地区花岗闪长岩体的Ta-Yb (a)、Nb-Y (b)、Rb-(Y+Nb) (c)和Rb/30-Hf-3Ta(d)图解

WPG.板内花岗岩；VAG.火山弧花岗岩；ORG.洋脊花岗岩；syn-COLG.同碰撞花岗岩；a.据Pearce et al.(1984); b.据Harris(1986)

Fig. 14. Ta-Yb (a), Nb-Y (b), Rb-(Y+Nb) (c) and Rb/30-Hf-3Ta (d) diagrams of the Lalong granodiorite masses in Namling, Tibet

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表 1 西藏南木林县拉隆地区花岗闪长岩体LA-ICP-MS锆石U-Pb同位素分析结果

Table 1. LA-ICP-MS U-Pb data from the Lalong granodiorite masses in Namling, Tibet

点号	含量(10^-6)			Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
点号	Pb	Th	U	Th/U	比值	±1σ	比值	±1σ	比值	±1σ	年龄(Ma)	±1σ	年龄(Ma)	±1σ
样品B1305-1(灰色似斑状花岗闪长岩)
1	192.0	923.5	2 357.6	0.39	0.052 4	0.001 6	0.254 9	0.008 1	0.034 9	0.000 5	230.5	6.56	221.2	3.1
2	187.2	1 041.2	2 610.8	0.40	0.051 1	0.001 8	0.238 7	0.008 6	0.033 7	0.000 6	217.4	7.03	213.9	3.9
3	112.2	547.3	1 744.2	0.31	0.057 8	0.002 5	0.274 0	0.012 4	0.034 4	0.000 6	245.9	9.92	218.2	3.6
4	114.8	542.5	1 680.9	0.32	0.055 6	0.004 2	0.269 6	0.021 4	0.036 1	0.000 8	242.3	17.10	228.5	5.3
5	147.3	748.8	2 362.4	0.32	0.059 0	0.005 8	0.273 6	0.028 3	0.034 8	0.000 8	245.6	22.54	220.7	4.9
6	188.6	1 055.0	2 868.4	0.37	0.055 4	0.006 1	0.252 1	0.029 3	0.034 4	0.000 8	228.3	23.75	218.0	5.3
7	85.7	324.5	1 249.3	0.26	0.063 2	0.007 1	0.305 4	0.035 9	0.036 5	0.000 9	270.6	27.89	231.3	5.6
8	139.3	803.0	1 772.0	0.45	0.055 4	0.005 6	0.270 4	0.028 4	0.036 8	0.000 8	243.0	22.69	233.1	5.3
9	242.7	1 571.0	2 446.9	0.64	0.053 9	0.004 7	0.258 7	0.023 4	0.035 9	0.000 7	233.6	18.86	227.3	4.6
10	350.1	2 364.2	2 677.7	0.88	0.051 8	0.003 9	0.254 6	0.019 9	0.036 4	0.000 7	230.3	16.12	230.8	4.3
11	210.4	920.7	2 497.9	0.37	0.057 2	0.004 1	0.271 0	0.021 9	0.034 3	0.000 9	243.5	17.49	217.6	5.3
12	180.7	1 066.7	1 842.6	0.58	0.051 1	0.002 5	0.241 0	0.011 9	0.034 4	0.000 7	219.3	9.70	218.3	4.1
样品BP07-5-1(灰色中细粒花岗闪长岩)
1	361.6	1 110.9	5 370.9	0.21	0.050 6	0.001 9	0.258 6	0.010 7	0.036 9	0.000 9	233.5	8.6	233.8	5.4
2	289.0	1 119.8	2 162.7	0.52	0.050 3	0.002 4	0.234 7	0.011 1	0.034 8	0.001 0	214.1	9.2	220.3	6.0
3	325.7	1 045.9	5 030.7	0.21	0.051 3	0.002 1	0.240 0	0.009 8	0.034 2	0.000 6	218.4	8.0	216.8	3.9
4	389.3	1 190.9	5 319.0	0.22	0.052 4	0.001 9	0.253 3	0.009 9	0.035 8	0.001 0	229.3	8.0	226.4	6.0
5	312.9	988.6	5 176.3	0.19	0.050 4	0.001 7	0.247 7	0.009 1	0.035 7	0.000 8	224.7	7.4	225.9	4.8
6	305.8	959.1	3 907.1	0.25	0.050 9	0.001 9	0.245 4	0.009 3	0.035 2	0.000 7	222.8	7.6	223.1	4.1
7	573.8	2 144.5	4 958.8	0.43	0.050 4	0.002 0	0.238 8	0.010 2	0.034 9	0.000 8	217.4	8.4	221.0	5.3
8	456.7	1 380.3	5 782.5	0.24	0.053 4	0.002 4	0.250 5	0.011 3	0.035 0	0.001 0	227.0	9.2	221.9	6.2
9	408.8	1 258.8	6 784.4	0.19	0.052 2	0.002 0	0.241 1	0.009 8	0.034 9	0.001 2	219.4	8.1	221.0	7.4
10	400.1	1 416.3	6 144.3	0.23	0.051 1	0.001 7	0.261 0	0.008 9	0.036 9	0.000 6	235.4	7.2	233.4	3.6
11	335.1	1 234.0	3 976.4	0.31	0.052 9	0.002 2	0.256 1	0.010 9	0.035 2	0.000 7	231.6	8.8	222.8	4.6

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表 2 西藏南木林县拉隆地区花岗闪长岩体主量元素含量(%)及有关参数

Table 2. Major element compositions (%) and relevant parameters of the Lalong granodiorite masses in Namling, Tibet

样品编号	花岗闪长岩	花岗闪长岩	花岗闪长岩	似斑状花岗闪长岩	黑云花岗闪长岩	巨斑似斑状花岗闪长岩	巨斑似斑状花岗闪长岩
岩石名称	P02-2-1	BP07-1-1	BP07-5-1	B1305-1	B0255-1	B8785-2	B9094-1
SiO₂	63.86	64.14	63.24	66.19	67.94	67.53	67.28
TiO₂	0.73	0.70	0.73	0.65	0.46	0.49	0.56
Al₂O₃	15.39	15.53	15.85	14.66	14.14	14.83	14.51
Fe₂O₃	0.52	0.31	0.30	0.29	0.07	0.29	0.22
FeO	4.07	4.10	4.37	3.94	3.33	3.20	3.67
MnO	0.08	0.08	0.08	0.07	0.07	0.07	0.07
MgO	1.75	1.76	1.75	1.52	1.22	1.32	1.34
CaO	2.87	2.71	3.32	2.97	2.00	2.54	2.12
Na₂O	2.89	2.88	2.82	3.04	2.58	2.86	2.93
K₂O	4.19	4.75	4.40	3.06	4.84	4.89	4.15
P₂O₅	0.20	0.19	0.21	0.19	0.14	0.15	0.16
H₂O⁺	1.47	1.23	1.10	1.54	1.45	0.76	1.57
CO₂	1.40	1.04	1.25	1.22	1.13	0.54	0.73
Total	99.43	99.42	99.43	99.33	99.38	99.46	99.31
A/NK	1.45	1.35	1.46	1.62	1.26	1.27	1.37
A/CNK	1.06	1.03	1.03	1.12	1.02	0.98	1.08
K₂O/Na₂O	1.45	1.65	1.56	1.88	1.01	1.71	1.42
FeO^T/MgO	2.60	2.49	2.65	2.77	2.77	2.63	2.88
刚玉(c)	4.70	3.65	3.87	4.04	4.32	1.82	3.49
注：分析测试单位为西南冶金地质测试所；A/NK=Al₂O₃/(Na₂O+K₂O)摩尔比；A/CNK= Al₂O₃/(CaO+Na₂O+K₂O)摩尔比；FeO^T=FeO+0.9Fe₂O₃.

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表 3 西藏南木林县拉隆地区花岗闪长岩体稀土元素分析结果(10^-6)及有关参数

Table 3. REE element compositions (10^-6) and relevant parameters of the Lalong granodiorite masses in Namling, Tibet

样品编号	BP02-2-1	BP07-1-1	BP07-5-1	B1305-1	B0255-1	B8785-2	B9094-1
La	49.22	47.07	55.76	40.67	27.92	32.79	50.43
Ce	101.14	96.54	108.94	82.89	57.65	61.44	94.73
Pr	11.37	10.91	12.14	9.21	6.43	7.68	11.49
Nd	44.78	44.28	48.50	36.89	27.48	29.77	42.43
Sm	7.80	7.51	8.15	6.29	4.88	5.70	7.08
Eu	1.37	1.50	1.61	1.28	1.09	1.18	1.24
Gd	7.47	6.82	7.52	5.78	4.58	5.22	5.90
Tb	1.03	0.91	1.00	0.79	0.62	0.84	0.84
Dy	5.45	4.79	5.28	4.06	3.30	4.82	4.56
Ho	1.03	0.92	1.00	0.78	0.63	0.97	0.91
Er	2.89	2.59	2.69	2.16	1.77	2.75	2.54
Tm	0.43	0.40	0.40	0.32	0.28	0.45	0.38
Yb	2.43	2.31	2.23	1.80	1.75	2.82	2.38
Lu	0.35	0.33	0.32	0.26	0.26	0.41	0.34
Y	26.76	25.09	24.83	20.34	16.85	28.31	25.19
ΣREE	236.76	226.88	255.53	193.17	138.62	156.83	225.25
(La/Yb)_N	14.52	14.59	17.90	16.21	11.47	8.35	15.23
Eu/Eu^*	0.54	0.63	0.62	0.64	0.69	0.65	0.57
Ce/Ce^*	1.01	1.01	0.98	1.01	1.02	0.92	0.93
注：分析测试单位为西南冶金地质测试所

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表 4 西藏南木林县拉隆地区花岗闪长岩体微量元素分析结果(10^-6)

Table 4. Trace element compositions (10^-6) of the Lalong granodiorite masses in Namling, Tibet

样品号	BP02-2-1	BP07-1-1	BP07-5-1	B1305-1	B0255-1	B8785-2	B9094-1
Rb	258.06	269.78	232.00	182.65	194.39	287.52	232.69
Sr	233.90	276.37	218.10	207.62	145.70	153.12	168.88
Ba	680.12	928.24	800.92	418.54	538.57	518.00	432.60
Th	31.14	35.17	32.84	33.82	27.69	30.90	38.42
U	4.50	4.30	3.81	5.06	3.62	4.22	4.35
Nb	14.92	14.73	15.70	14.79	11.85	15.35	12.59
Ta	1.52	1.38	1.43	1.44	1.19	2.44	1.28
Zr	268.41	236.10	284.44	263.07	207.27	191.70	232.08
Hf	7.75	7.23	8.27	7.52	6.33	6.07	7.01
Ga	20.19	20.10	22.90	21.28	18.39	18.45	16.31
Sc	12.07	11.60	13.31	11.47	8.90	7.24	7.04
V	68.63	69.50	71.52	64.72	45.20	42.39	47.49
Cr	33.09	32.90	32.85	38.00	30.81	24.43	23.19
Co	10.26	9.82	10.91	9.69	6.98	8.31	7.81
Ni	10.25	11.05	9.97	10.24	8.70	7.35	6.95
Cu	8.51	13.21	13.78	39.95	6.07	7.99	22.24
Pb	43.72	51.00	54.27	46.53	75.40	63.34	47.87
Zn	64.04	63.29	64.23	65.49	49.07	43.93	48.57
注：分析测试单位为西南冶金地质测试所

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表 5 西藏南木林县拉隆地区花岗闪长岩体锆石Lu-Hf同位素分析数据

Table 5. Lu-Hf isotope compositions of the Lalong granodiorite masses in Namling, Tibet

测点号	Hf(10^-6)	Lu(10^-6)	f_Lu/Hf	年龄(Ma)	同位素比值				ε_Hf(0)	±1σ	ε_Hf(t)	±1σ	t_DM1(Ma)	t_DM2(Ma)
测点号	Hf(10^-6)	Lu(10^-6)	f_Lu/Hf	年龄(Ma)	¹⁷⁶Hf/¹⁷⁷Hf	±1σ	¹⁷⁶Lu/¹⁷⁷Hf	±1σ	ε_Hf(0)	±1σ	ε_Hf(t)	±1σ	t_DM1(Ma)	t_DM2(Ma)
B1305-1灰色似斑状细-中粒花岗闪长岩
B1305-1HF.1	4 736	39	-0.97	228.96	0.282 505	0.000 022	0.001 112	0.000 028	-9.5	0.9	-4.6	1.0	1 060	1 385
B1305-1HF.2	5 478	44	-0.97	221.18	0.282 528	0.000 022	0.001 020	0.000 010	-8.6	0.9	-3.9	0.9	1 025	1 342
B1305-1HF.3	4 683	31	-0.97	218.17	0.282 576	0.000 040	0.000 900	0.000 023	-6.9	1.5	-2.3	1.5	954	1 247
B1305-1HF.4	2 418	16	-0.97	228.50	0.282 641	0.000 036	0.000 861	0.000 016	-4.6	1.4	0.3	1.4	862	1 115
B1305-1HF.5	6 497	53	-0.97	220.73	0.282 552	0.000 022	0.001 070	0.000 022	-7.8	0.9	-3.1	0.9	992	1 295
B1305-1HF.6	2 325	21	-0.96	218.03	0.282 713	0.000 048	0.001 174	0.000 015	-2.1	1.8	2.5	1.8	767	980
B1305-1HF.7	2 855	13	-0.98	231.27	0.282 575	0.000 048	0.000 598	0.000 006	-7.0	1.8	-2.0	1.8	948	1 241
B1305-1HF.8	3 802	37	-0.96	227.33	0.282 598	0.000 020	0.001 249	0.000 016	-6.2	0.9	-1.4	0.9	932	1 204
B1305-1HF.9	4 415	34	-0.97	230.75	0.282 547	0.000 028	0.001 001	0.000 008	-8.0	1.1	-3.0	1.1	997	1 300
B1305-1HF.10	4 498	28	-0.98	218.31	0.282 486	0.000 028	0.000 799	0.000 006	-10.1	1.1	-5.5	1.1	1 078	1 424
BP07-5-1灰色中细粒花岗闪长岩
BP07-5-1HF.1	4 068	25	-0.98	220.34	0.282 560	0.000 025	0.000 805	0.000 021	-7.5	1.0	-2.8	1.0	974	1277
BP07-5-1HF.2	6 872	60	-0.97	226.44	0.282 494	0.000 019	0.001 141	0.000 017	-9.8	0.8	-5.0	0.9	1 076	1 407
BP07-5-1HF.3	5 291	32	-0.98	225.89	0.282 481	0.000 024	0.000 793	0.000 004	-10.3	1.0	-5.4	1.0	1 084	1 429
BP07-5-1HF.4	6 115	28	-0.98	223.07	0.282 456	0.000 022	0.000 598	0.000 009	-11.2	0.9	-6.4	0.9	1 114	1 479
BP07-5-1HF.5	6 105	55	-0.97	220.96	0.282 545	0.000 020	0.001 157	0.000 006	-8.0	0.9	-3.4	0.9	1 005	1 310
BP07-5-1HF.6	5 176	42	-0.97	221.89	0.282 524	0.000 020	0.001 043	0.000 010	-8.8	0.9	-4.0	0.9	1 031	1 349
BP07-5-1HF.7	4 915	33	-0.97	221.02	0.282 526	0.000 021	0.000 880	0.000 004	-8.7	0.9	-4.0	0.9	1 024	1 344
BP07-5-1HF.8	7 971	49	-0.98	222.82	0.282 481	0.000 017	0.000 795	0.000 006	-10.3	0.8	-5.5	0.8	1 084	1 431
注：分析测试在中国地质大学(武汉)地质过程与矿产资源国家重点实验室完成.

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表 6 拉隆花岗闪长岩体与典型花岗岩体相关特征对比

Table 6. The features between the Lalong granodiorite masses and the typical granite

矿物	I型	S型	A型	M型	拉隆花岗闪长岩
长英质矿物	石英不太多，长石可呈粉红色	石英较多，长石常呈白色	条纹碱性长石常见	可见显微纹象钾长石	正长石常见
常见铁镁矿物	黑云母Mg/Fe高，白云母较罕见	黑云母Mg/Fe低，白云母较常见	黑云母形成晚，充填于粒间(富铁Fe²⁺)	角闪石、黑云母、辉石	黑云母分布于长石之间
不透明矿物	磁铁矿物±钛铁矿±黄铁矿	钛铁矿(＜0.1%)±磁黄铁矿、石墨、独居石	磁铁矿	磁铁矿	磁铁矿
w(SiO₂)	53%~76%	65%~79%	60%~80%	54%~73%	63.24%~67.94%
w(Na₂O)	＞3.2%	变化大	＞2.8%	＞3.2%	2.58%~3.04%
w(K₂O)/w(Na₂O)	低(＜1)	高(＞1)	一般较高	很低	1.08~1.88
A/CNK	＜1.1	＞1.1	变化大	＜1.2	0.99~1.13
w(SiO₂)=66%时的w(CaO)	＞3.7%	＜3.7%	低，如1.1%	？	1.94%~3.46%
CIPW刚玉分子	＜1%	＞1%	？	？	1.82%~4.70%
包含岩类	花岗岩-辉长岩	淡色花岗岩-花岗闪长岩	碱性花岗岩-斜长岩	闪长岩-辉长岩	花岗闪长岩
注：各类花岗岩据路凤香和桑隆康(2002)，桑隆康和马昌前(2012)；“?”表示无明确数据.

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