青海玉树查涌地区高镁闪长岩年龄、岩石成因及构造背景

王键; 孙丰月; 姜和芳; 禹禄; 王飞; 宁传奇; 张万辉

doi:10.3799/dqkx.2018.904

青海玉树查涌地区高镁闪长岩年龄、岩石成因及构造背景

doi: 10.3799/dqkx.2018.904

1.
黑龙江科技大学矿业工程学院, 黑龙江哈尔滨 150022
2.
吉林大学地球科学学院, 吉林长春 130061
3.
青海省有色地质矿产勘查局地质矿产勘查院, 青海西宁 810000

基金项目:

国家自然科学基金项目 41272093

中国地质调查局项目 12120113098300

详细信息

作者简介:
王键(1987-), 男, 讲师, 主要从事矿床地质学方向研究

中图分类号: P597
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-13
- 刊出日期: 2018-03-15

Age, Petrogenesis and Tectonic Implications of High-Mg Diorite in Chayong Region, Yushu, Qinghai

1.
Institute of Mining Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China
2.
College of Earth Sciences, Jilin University, Changchun 130061, China
3.
Qinghai Nonferrous Metals Geological Exploration Bureau, Xining 810000, China

摘要

摘要: 为了查明青海玉树查涌地区闪长岩岩石成因及形成的地球动力学背景，对其进行了岩相学、矿物电子探针分析、锆石LA-ICP-MS U-Pb年代学和岩石地球化学分析.闪长岩锆石LA-ICP-MS U-Pb年龄为230±2 Ma，属于晚三叠世.电子探针分析结果显示，闪长岩中的斜长石具有正环带结构，核部斜长石属于倍长石或钙长石，边部属于中长石或拉长石；黑云母矿物成分为镁质黑云母，结晶温度介于647~688 ℃，侵位深度约为14.2~15.5 km；角闪石属于钙质角闪石，显示壳幔混合成因的特点.岩石地球化学分析结果显示闪长岩具有富硅、富镁、高的Mg^#值及较高含量的Cr和Ni，富集LILE和LREE，亏损HFSE，铕异常不明显，与高镁闪长岩中的赞岐岩相似.闪长岩中锆石的ε_Hf（t）值为-10.4~-10.3和-6.4~-4.0，锆石Hf单阶段模式年龄（t_DM1）为1 021~1 311 Ma.分析研究表明闪长岩形成于俯冲带之上的地幔楔环境，为地幔橄榄岩与俯冲的洋壳板片部分熔融的富硅质熔体平衡反应形成的.结合区域地质演化认为晚三叠世古特提斯洋仍处于俯冲消减状态，查涌高镁闪长岩为金沙江洋向西俯冲消减过程中的产物.
- 高镁闪长岩 /
- U-Pb年代学 /
- 地球化学 /
- 晶体化学 /
- 青海 /
- 玉树
Abstract: This paper presents petrography, electron microprobe results, zircon U-Pb dating and geochemistry of diorites at Chayong, Yushu, Qinghai Province, with the aim of constraining its petrogenesis and geodynamic significance. The dating results indicate that the diorite formed in the Late Triassic (230±2 Ma). Electronic Probe analysis results show that plagioclase has a band structure with bytownite and calciclase in the centre, andesine and labradorite on the edge. Biotite belongs to magnesia biotite, which crystallized at temperature of 647-688 ℃, at depth of 14.2-15.5 km.Hornblende belongs to calcic amphibole and has the characteristics of crust-mantle mixing origin of the magma.The diorites contain high SiO₂, MgO, Mg^# values, Cr and Ni, enriched in large ion lithophile elements (LILEs) and light rare earth elements(LREEs), depleted in the high field strength elements (HFSE), which is similar with high-Mg diorite. The ε_Hf(t) values of zircons from the diorites vary from -10.4 to -10.3 and from -6.4 to -4.0, and their Hf one-stage model ages vary from 1 021 to 1 311 Ma. They are likely formed from mantle peridotites by reacting with Si-rich melts released from subducted oceanic slab. Combined with regional tectonic evolution, it is suggested that the diorites might have been resulted from the subduction of Jinshajiang Ocean in the Late Triassic.
- high-Mg diorite /
- zircon U-Pb geochronology /
- geochiemistry /
- crystal chemistry /
- Qinghai /
- Yushu

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图 1 中国三江成矿带构造简图

1.三叠纪火山岩；2.三叠纪侵入岩；3.锆石U-Pb年龄(Ma)；AKMS-A'nyemaqun suture.阿尼玛卿缝合带；JSS-Jinsha suture.金沙江缝合带；LSS-Longmucuo-Shuanghu suture.龙木错-双湖缝合带；BNS-Bangong-Nujiang suture.班公湖-怒江缝合带；ITS-Indus Tsangpo suture.雅鲁藏布江缝合带；GLS-Ganzi-Litang suture.甘孜-理塘缝合带；据Yin and Harrison(2000); Spurlin et al.(2005)修改；年龄数据据赵少卿等(2015)

Fig. 1. Simplified geological map of the Chinese Sanjiang metallogenic belt showing major structures

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图 2 查涌地区区域地质图

1.第四系；2.始新统-中新统；3.侏罗系；4.上三叠统巴塘群；5.上三叠统结扎群；6.中上三叠统巴颜喀拉山群；7.中三叠统结隆群；8.查涌蛇绿混杂岩；9.多彩蛇绿混杂岩；10.中下二叠统开心岭群；11.下石炭统杂多群；12.中元古界宁多群；13.古近纪花岗岩；14.晚侏罗世花岗岩；15.晚三叠世花岗岩；16.断层；17.多金属矿床；18.乡镇；19.研究区位置；据王键等(2017)修改

Fig. 2. Regional geological map of Chayong region

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图 3 查涌地区地质图

1.第四系；2.变余粉砂岩；3.泥质板岩；4.石英砂岩；5.泥质片岩；6.凝灰质板岩；7.灰岩；8.闪长岩；9.石英闪长岩；10.辉长岩；11.玄武岩；12.铜矿体；13.蚀变带；14.铅锌矿体；15.取样位置；16.断裂；据青海有色矿产勘察院资料修改

Fig. 3. Regional geological map of Chayong

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图 4 查涌地区闪长岩标本照片及显微照片

a，b.查涌地区闪长岩手标本照片；c，d.正交偏光；Qtz.石英；Pl.斜长石；Hbl.角闪石；Bt.黑云母

Fig. 4. Microphotographs of diorite in Chayong

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图 5 角闪石的成分变化与定名图

Ca_B.B位置Ca原子数; (Na+K)_A.A位置Na与K原子数之和; T Si.T位置Si原子数; Al^Ⅵ.C位置AlⅥ的原子数；Fe³⁺.C位置Fe³⁺的原子数；据Leake(1997)

Fig. 5. Diagrams showing classification of hornblendes

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图 6 黑云母Mg-(Al^Ⅵ+Fe³⁺+Ti)-(Fe²⁺+Mn)分类图

A.金云母; B.镁质黑云母; C.铁质黑云母; D.铁叶云母; E.铁白云母; F.白云母; 据Foster(1960)修改

Fig. 6. Mg-(Al^Ⅵ+Fe³⁺+Ti)-(Fe²⁺+Mn) diagram of biotites

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图 7 黑云母的Fe³⁺-Fe²⁺-Mg图解

据Wones and Eugster(1965)

Fig. 7. Fe³⁺-Fe²⁺-Mg diagram of biotites

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图 8 查涌闪长岩锆石阴极发光图像

Fig. 8. Cathodoluminescence images of analyzed zircons from diorite in Chayong

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图 9 锆石U-Pb年龄谐和图(a)；锆石年龄加权图(b)

Fig. 9. Zircon U-Pb concordia diagram (a) and weighted average ages diagram (b) for diorite

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图 10 查涌闪长岩TAS图解(a)和SiO₂-K₂O图解(b)

Fig. 10. TAS (a) and SiO₂-K₂O (b) diagrams for diorite in Chayong

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图 11 查涌闪长岩稀土元素球粒陨石标准化稀土元素(标准化数值据Boynton, 1984)和原始地幔标准化微量元素配分曲线(标准化数据据Sun and McDonough, 1989)

Fig. 11. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagram (b) for diorite in Chayong

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图 12 黑云母结晶Ti vs.Mg/(Mg+Fe)图解

据Henry et al.(2005)

Fig. 12. Temperature isotherms (℃) calculated from the surface-fit equation on Ti vs. Mg/(Mg+Fe) diagram

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图 13 角闪石Al-Si图解

姜常义和安三元(1984)；Al、S为角闪石结构式中离子数

Fig. 13. Al-Si Diagram of crystal-chemical genesis of hornblende

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图 14 查涌闪长岩sanukite、adakite、boninite和bajaite判别图解

据Kamei et al.(2004)

Fig. 14. Discrimination diagrams for sanukite, adakite, boninite and bajaite

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图 15 查涌闪长岩Th/Yb-Nb/Yb(a)、Ba/Th-Th/Nb(b)和Nb/Zr-Th/Zr图解

a.据Pearce(2008)；b.据Hanyu et al.(2006)；c.据Woodhead et al.(2004)

Fig. 15. Th/Yb-Nb/Yb、Ba/Th-Th/Nb and Nb/Zr-Th/Zr diagrams of diorite in Chayong

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图 16 查涌闪长岩锆石的ε_Hf(t)-t图解

据Yang et al.(2006)

Fig. 16. ε_Hf(t)-t diagram of diorite in Chayong

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表 1 查涌闪长岩斜长石电子探针测试结果(%)

Table 1. Electron microprobe analysis (%) of the plagioclase from diorite in Chayong

测点号	SC1	SC2	SC3	SC4	SC5	SC6	SC7	SC8	SC9
位置	核部	核部	核部	核部	边部	边部	边部	边部	边部
SiO₂	47.17	46.49	47.26	47.64	53.92	55.45	53.96	52.86	53.72
TiO₂	0.00	0.00	0.00	0.00	0.00	0.00	0.03	0.00	0.00
Al₂O₃	33.79	34.15	33.39	33.48	28.84	28.31	29.35	29.57	29.69
FeO	0.04	0.01	0.06	0.00	0.01	0.07	0.06	0.22	0.04
MnO	0.00	0.00	0.00	0.00	0.02	0.00	0.03	0.01	0.03
MgO	0.00	0.00	0.01	0.00	0.00	0.02	0.00	0.00	0.04
Cr₂O₃	0.02	0.00	0.08	0.03	0.05	0.00	0.02	0.00	0.03
CaO	16.54	17.04	15.92	16.41	10.71	10.27	11.23	11.92	11.48
Na₂O	2.17	1.84	2.37	2.49	5.93	6.02	5.39	5.23	5.24
K₂O	0.01	0.04	0.01	0.06	0.11	0.05	0.05	0.03	0.05
Total	99.74	99.57	99.10	100.11	99.58	100.17	100.13	99.84	100.32
An	89	91	88	88	66	65	70	72	71
Ab	11	9	12	12	33	35	30	28	29

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表 2 查涌闪长岩中角闪石电子探针分析结果

Table 2. Electron microprobe analysis of hornblende from diorite in Chayong

	测点号	SC10	SC11	SC12	SC13	SC14	SC15	SC16	SC17	SC18	SC19	SC20	SC21	SC22	SC23
	SiO₂	48.61	49.90	50.35	49.53	50.16	50.68	50.08	48.35	50.00	50.62	49.38	48.85	49.86	49.15
	TiO₂	1.52	0.78	1.13	1.06	0.88	0.39	0.45	0.84	1.54	0.49	1.08	1.32	0.36	0.39
	Al₂O₃	6.86	6.22	6.14	6.57	5.75	5.11	7.21	7.55	5.79	4.98	6.90	6.40	6.93	6.54
	TFeO	12.56	12.16	12.05	12.47	12.00	12.06	12.31	12.71	11.86	12.25	12.14	11.90	12.19	11.81
	Cr₂O₃	0.15	0.20	0.27	0.13	0.15	0.10	0.08	0.05	0.10	0.09	0.21	0.27	0.11	0.07
百分含量(%)	MnO	0.28	0.33	0.29	0.30	0.29	0.33	0.32	0.40	0.32	0.31	0.30	0.27	0.30	0.31
	MgO	13.98	14.73	14.81	14.77	14.69	15.25	14.47	14.35	15.08	15.15	14.01	14.24	14.19	14.66
	CaO	11.26	11.10	11.42	11.20	11.31	11.19	11.39	10.21	11.33	11.24	11.43	11.57	11.33	11.36
	K₂O	0.35	0.22	0.25	0.28	0.27	0.15	0.18	0.25	0.30	0.19	0.28	0.35	0.15	0.16
	Na₂O	0.66	0.60	0.55	0.75	0.59	0.56	0.68	0.58	0.65	0.48	0.65	0.61	0.66	0.69
	Total	96.21	96.24	97.25	97.07	96.08	95.82	97.16	95.29	96.97	95.79	96.38	95.77	96.07	95.15
T	Si	7.16	7.30	7.29	7.21	7.35	7.43	7.25	7.16	7.27	7.43	7.23	7.21	7.30	7.27
T	Al^Ⅳ	0.84	0.70	0.71	0.79	0.65	0.57	0.75	0.84	0.73	0.57	0.77	0.79	0.70	0.73
C	Al^Ⅵ	0.35	0.37	0.34	0.34	0.34	0.31	0.48	0.48	0.26	0.30	0.42	0.32	0.49	0.41
	Ti	0.15	0.08	0.11	0.10	0.09	0.04	0.04	0.08	0.15	0.05	0.11	0.13	0.04	0.04
	Cr	0.02	0.02	0.03	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.02	0.03	0.01	0.01
	Fe²⁺	1.54	1.48	1.45	1.51	1.46	1.47	1.49	1.57	1.44	1.50	1.48	1.46	1.49	1.46
	Mn	0.03	0.04	0.04	0.04	0.04	0.04	0.04	0.05	0.04	0.04	0.04	0.03	0.04	0.04
	Mg	3.09	3.23	3.22	3.23	3.23	3.35	3.14	3.19	3.29	3.34	3.08	3.15	3.12	3.25
B	Ca	1.78	1.74	1.77	1.75	1.78	1.76	1.77	1.62	1.77	1.77	1.79	1.83	1.78	1.80
B	Na	0.19	0.17	0.15	0.21	0.17	0.16	0.19	0.17	0.18	0.14	0.19	0.17	0.19	0.20
A	K	0.07	0.04	0.05	0.05	0.05	0.03	0.03	0.05	0.05	0.03	0.05	0.07	0.03	0.03
Mg/(Mg+Fe²⁺)		0.67	0.69	0.69	0.68	0.69	0.69	0.68	0.67	0.70	0.69	0.68	0.68	0.68	0.69
Si/(Si+Ti+Al)		0.843	0.864	0.863	0.854	0.872	0.890	0.851	0.837	0.864	0.891	0.848	0.853	0.856	0.861
Ca/(Ca+Mg+Fe²⁺)		0.28	0.27	0.27	0.27	0.27	0.27	0.28	0.25	0.27	0.27	0.28	0.28	0.28	0.28

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表 3 查涌闪长岩中黑云母电子探针分析结果

Table 3. Electron microprobe analysis of biobitie from diorite in Chayong

测点号	SC24	SC25	SC26	SC27	SC28	SC29	SC30	SC31
SiO₂	36.76	35.06	36.91	36.27	36.52	37.22	36.94	36.46
TiO₂	2.18	2.10	2.11	1.93	2.14	2.39	2.48	2.55
Al₂O₃	16.35	16.19	16.39	16.56	16.23	16.60	16.23	16.21
FeO^T	14.45	14.81	14.70	14.93	14.75	14.49	14.76	14.90
MnO	0.14	0.14	0.12	0.13	0.13	0.11	0.05	0.08
MgO	13.46	12.97	13.21	13.31	13.17	13.33	13.23	13.06
Cr₂O₃	0.26	0.30	0.21	0.22	0.23	0.18	0.17	0.17
CaO	0.01	0.10	0.00	0.02	0.05	0.05	0.04	0.01
Na₂O	0.17	0.29	0.13	0.13	0.13	0.22	0.22	0.15
K₂O	9.50	8.90	9.75	9.26	9.56	9.62	9.49	10.02
Total	93.28	90.86	93.51	92.77	92.90	94.20	93.60	93.62
Si	6.60	6.51	6.62	6.57	6.60	6.61	6.61	6.56
Ti	0.26	0.26	0.25	0.23	0.26	0.28	0.30	0.31
Al^Ⅳ	1.40	1.49	1.38	1.43	1.40	1.39	1.39	1.44
Al^Ⅵ	2.05	2.04	2.08	2.10	2.05	2.09	2.02	1.99
Fe	2.16	2.29	2.20	2.25	2.22	2.15	2.20	2.23
Fe²⁺	1.29	1.49	1.33	1.34	1.35	1.21	1.22	1.50
Fe³⁺	0.97	0.93	0.98	1.03	0.99	1.03	1.08	0.86
Mn	0.02	0.02	0.02	0.02	0.02	0.02	0.01	0.01
Mg	3.62	3.61	3.55	3.62	3.57	3.55	3.55	3.52
Cr	0.04	0.04	0.03	0.03	0.03	0.03	0.02	0.02
Ca	0.00	0.02	0.00	0.00	0.01	0.01	0.01	0.00
Na	0.06	0.11	0.04	0.05	0.05	0.07	0.07	0.05
K	2.18	2.11	2.23	2.14	2.21	2.18	2.17	2.30
Fe²⁺/(Fe²⁺+Mg)	0.26	0.29	0.27	0.27	0.27	0.25	0.26	0.30
Mg/(Mg+Fe²⁺+Mn)	0.73	0.70	0.73	0.73	0.72	0.74	0.74	0.70
Al^Ⅵ+Fe³⁺+Ti	3.29	3.23	3.31	3.36	3.29	3.40	3.40	3.16
Fe²⁺+Mn	1.31	1.51	1.34	1.36	1.37	1.23	1.23	1.51
X_Mg	0.62	0.60	0.61	0.60	0.60	0.61	0.61	0.60
Ti温度(℃)	669	663	660	647	663	681	686	688
P(MPa)	390	411	391	415	389	398	383	376
H(m)	1 472	1 552	1 479	1 569	1 469	1 505	1 448	1 422
注：FeO^T为电子探针测试FeO质量百分数，X_Mg=Mg/(Mg+Fe).

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表 4 查涌闪长岩锆石LA-ICP-MSU-Pb同位素定年结果

Table 4. Results of LA-ICP-MS zircon U-Pb dating of diorite in Chayong

测点号	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁶Pb/²³⁸U
测点号	Th(10^-6)	U(10^-6)	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄	1σ
CY-01	271	463	0.59	0.050 7	0.002 6	0.253 9	0.012 7	0.036 3	0.000 5	230	3
CY-02	397	765	0.52	0.052 7	0.002 1	0.262 2	0.010 1	0.036 4	0.000 8	230	5
CY-03	338	715	0.47	0.053 1	0.001 9	0.265 8	0.009 7	0.036 3	0.000 4	230	3
CY-04	553	733	0.75	0.052 4	0.003 1	0.260 6	0.015 4	0.036 2	0.000 6	229	4
CY-05	271	441	0.61	0.052 8	0.002 6	0.263 3	0.012 8	0.036 3	0.000 6	230	3
CY-06	264	444	0.59	0.050 8	0.002 3	0.251 4	0.010 8	0.036 2	0.000 6	229	4
CY-07	311	682	0.46	0.055 7	0.004 1	0.282 5	0.022 8	0.036 4	0.000 9	231	6
CY-08	640	696	0.92	0.057 8	0.008 4	0.283 0	0.043 6	0.035 5	0.001 3	225	8
CY-09	319	789	0.40	0.053 3	0.003 6	0.265 0	0.018 1	0.036 1	0.000 7	229	4
CY-10	507	641	0.79	0.048 1	0.002 2	0.239 7	0.010 7	0.036 3	0.000 5	230	3
CY-11	1 929	2 862	0.67	0.056 8	0.004 5	0.266 0	0.016 9	0.035 5	0.000 7	225	4
CY-12	289	385	0.75	0.054 4	0.002 6	0.271 4	0.012 8	0.036 3	0.000 6	230	4
CY-13	396	800	0.50	0.050 9	0.002 4	0.252 4	0.010 3	0.036 2	0.000 6	229	4
CY-14	291	623	0.47	0.052 6	0.003 1	0.259 1	0.014 5	0.035 5	0.000 7	225	4
CY-15	1 218	2 053	0.59	0.050 0	0.001 2	0.251 1	0.006 1	0.036 3	0.000 4	230	2
CY-16	481	895	0.54	0.049 8	0.001 8	0.250 8	0.009 4	0.036 4	0.000 4	231	3
CY-17	379	681	0.56	0.052 2	0.003 2	0.260 0	0.015 8	0.036 2	0.000 7	229	4
CY-18	319	618	0.52	0.051 3	0.002 9	0.255 1	0.014 1	0.036 4	0.000 6	231	4
CY-19	338	484	0.70	0.055 2	0.003 5	0.277 7	0.018 3	0.036 3	0.000 6	230	4
CY-20	362	871	0.42	0.055 7	0.001 9	0.277 9	0.009 6	0.036 4	0.000 6	230	4
CY-21	389	452	0.86	0.053 9	0.002 8	0.270 0	0.013 9	0.036 4	0.000 5	231	3

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表 5 查涌闪长岩锆石Hf同位素分析结果

Table 5. Zircon Lu-Hf isotopic compositions of diorite in Chayong

点号	年龄(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(0)	ε_Hf(t)	T_DM1(Ma)	f_Lu/Hf
CY-1	229	0.007 231	0.000 371	0.282 518	0.000 016	0.282 517	-9.0	-4.0	1 021	-0.99
CY-2	229	0.009 170	0.000 458	0.282 506	0.000 015	0.282 504	-9.4	-4.4	1 040	-0.99
CY-3	229	0.012 179	0.000 544	0.282 518	0.000 015	0.282 516	-9.0	-4.0	1 026	-0.98
CY-4	229	0.025 173	0.001 028	0.282 485	0.000 017	0.282 480	-10.2	-5.3	1 086	-0.97
CY-5	229	0.030 632	0.001 238	0.282 482	0.000 017	0.282 477	-10.3	-5.4	1 096	-0.96
CY-6	229	0.009 168	0.000 430	0.282 498	0.000 015	0.282 496	-9.7	-4.7	1 051	-0.99
CY-7	229	0.005 738	0.000 299	0.282 507	0.000 019	0.282 506	-9.4	-4.4	1 035	-0.99
CY-8	229	0.005 037	0.000 259	0.282 474	0.000 019	0.282 473	-10.5	-5.5	1 078	-0.99
CY-9	229	0.020 573	0.000 857	0.282 451	0.000 022	0.282 448	-11.3	-6.4	1 127	-0.97
CY-10	229	0.037 301	0.001 680	0.282 347	0.000 019	0.282 339	-15.0	-10.3	1 302	-0.95
CY-11	229	0.006 323	0.000 324	0.282 499	0.000 015	0.282 498	-9.7	-4.7	1 046	-0.99
CY-12	229	0.013 544	0.000 595	0.282 457	0.000 017	0.282 455	-11.1	-6.2	1 112	-0.98
CY-13	229	0.005 417	0.000 286	0.282 458	0.000 017	0.282 457	-11.1	-6.1	1 102	-0.99
CY-14	229	0.006 753	0.000 355	0.282 455	0.000 019	0.282 453	-11.2	-6.2	1 108	-0.99
CY-15	229	0.037 040	0.001 744	0.282 342	0.000 022	0.282 335	-15.2	-10.4	1 311	-0.95
注：ε_Hf(0)=[(¹⁷⁶Hf/¹⁷⁷Hf)S/(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}-1]×10 000;ε_Hf(t)={[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_S×(e^λt-1)]/[(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}-(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR×(e^λt-1)]-1}×10 000;T_Hf1=1/λ×{1+[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Hf/¹⁷⁷Hf)_DM)/(¹⁷⁶Lu/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_DM]}; T_Hf2=T_Hf1-(T_Hf1-t)[(f_CC-f_S)/(f_CC-f_DM)]; f_Lu/Hf=(¹⁷⁶Lu/¹⁷⁷Hf)_S/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1；其中，(¹⁷⁶Lu/¹⁷⁷Hf)_S和(¹⁷⁶Hf/¹⁷⁷Hf)_S为样品测定值，(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR=0.032 2，(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}=0.282 772；(¹⁷⁶Lu/¹⁷⁷Hf)_DM=0.038 4，(¹⁷⁶Hf/¹⁷⁷Hf)_DM=0.283 25；f_CC、f_S、f_DM分别为大陆地壳、样品和亏损地幔的f_Lu/Hf，t为样品形成时间，λ=1.867×10^-11a^-1.

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表 6 查涌闪长岩岩主量元素(%)、微量元素(10^-6)和稀土元素(10^-6)分析结果

Table 6. Major elements, trace elements and rare elements analyses of diorite in Chayong

样品	SCY1	SCY2	SCY3	SCY4	样品	SCY1	SCY2	SCY3	SCY4
SiO₂	56.92	56.64	57.09	56.31	Y	16.57	14.5	14.45	14.73
Al₂O₃	15.38	13.98	14.60	15.23	Zr	63.5	38.79	54.59	58.77
Fe₂O₃	1.87	1.21	0.60	0.88	Nb	6.36	5.78	4.99	5.54
FeO	5.19	5.61	5.68	5.57	Cd	1.41	1.19	1.39	1.45
CaO	7.77	7.38	8.48	8.43	Ba	191.0	2796.0	130.2	158.8
MgO	6.52	8.89	7.82	7.35	La	11.61	10.49	9.67	10.03
K₂O	1.16	0.97	0.90	1.29	Ce	24.76	23.68	20.97	21.57
Na₂O	2.02	1.74	1.83	1.85	Pr	3.06	3.10	2.64	2.73
TiO₂	0.61	0.54	0.40	0.48	Nd	11.63	11.75	9.91	10.07
P₂O₅	0.07	0.09	0.06	0.06	Sm	2.65	2.69	2.30	2.28
MnO	0.20	0.18	0.17	0.18	Eu	0.89	1.10	0.78	0.81
LOI	2.02	2.52	2.07	1.96	Tb	0.47	0.44	0.41	0.41
Total	99.74	99.75	99.70	99.58	Dy	2.84	2.48	2.42	2.50
FeO_t	6.88	6.70	6.22	6.36	Ho	0.57	0.49	0.49	0.51
M#	63	70	69	67	Er	1.68	1.41	1.46	1.45
Na/K	1.74	1.79	2.04	1.44	Tm	0.24	0.19	0.20	0.21
ANK	3.35	3.58	3.65	3.43	Yb	1.69	1.41	1.51	1.49
P	310.39	391.98	262.87	280.06	Lu	0.28	0.22	0.24	0.23
Sc	30.82	31.41	31.32	31.38	Hf	1.86	1.30	1.67	1.70
V	171.6	174.1	153.7	164.7	Ta	0.66	0.64	0.71	0.70
Cr	218.9	415.9	296.1	284.8	Pb	8.65	90.56	6.29	7.98
Mn	1 402	1 206	1 187	1 230	Th	3.32	1.53	1.63	1.27
Co	24.58	33.72	27.43	26.63	U	0.81	0.06	0.10	0.10
Ni	57.86	127.6	82.87	69.06	Sr/Y	9.90	10.73	8.99	9.64
Cu	34.37	157.20	32.88	38.25	LREE	54.59	52.81	46.27	47.50
Zn	83.09	132.8	76.29	75.25	HREE	7.76	6.63	6.72	6.80
Ga	14.89	12.37	13.19	14.02	REE	62.35	59.44	52.99	54.30
As	6.30	4.48	4.50	5.08	LREE/HREE	7.03	7.97	6.89	6.98
Se	7.65	5.39	6.75	9.40	(La/Yb)_N	4.64	5.02	4.33	4.54
Rb	39.92	41.09	34.83	55.06	Eu/Eu^*	0.99	1.24	1.00	1.04
Sr	164.1	155.6	129.9	142

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