青藏高原北部全吉地块白垩纪煌斑岩脉群的发现及意义

王秉璋; 陈静; 张金明; 李积清; 白建海

doi:10.3799/dqkx.2019.139

青藏高原北部全吉地块白垩纪煌斑岩脉群的发现及意义

doi: 10.3799/dqkx.2019.139

青藏高原北部地质过程与矿产资源重点实验室, 青海省地质调查院, 青海西宁 810012

基金项目:

第二次青藏高原综合科学考察研究（STEP）项目 2019QZKK0702

国家自然科学基金项目 41762006

青海省重大科技专项 2016-SF-A3

详细信息

作者简介:
王秉璋(1969-), 男, 正高级工程师, 博士, 从事区域地质矿产调查工作

中图分类号: P581
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出版历程
- 收稿日期: 2019-06-09
- 刊出日期: 2020-04-15

Discovery and Significance of Cretaceous Lamprophyre Dike Group in Quanji Block of Northern Tibetan Plateau

Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources, Qinghai Geological Survey Institute, Xining 810012, China

摘要

摘要: 除陆相沉积盆地外，青藏高原北部白垩纪建造记录稀少，岩浆活动的研究极少，幔源岩浆活动十分罕见，在青藏高原北部全吉地块首次发现了白垩纪煌斑岩脉群，深入研究可深化认识高原北部中生代晚期地质过程.对分布在全吉地块东部沙柳泉地区的煌斑岩进行了大比例尺填图，主微量元素、Sr-Nd-Pb同位测定、锆石SHRIMP和LA-ICP-MS U-Pb年代学研究.煌斑岩中获得锆石U-Pb年龄分别为135.2±1.8 Ma和132.9±1.3 Ma.岩石具高钾（K₂O=4.53%~5.25%）、镁（MgO=7.23%~12.27%）和低钛（0.85%~1.29%）的特点，为钾质钙碱性煌斑岩，Rb、Ba、Th、U和Pb等大离子亲石元素（LILE）富集，Nb、Ta和Ti等高场元素（HFSE）亏损，（⁸⁷Sr/⁸⁶Sr）_i介于0.718 0~0.718 6.ε_Nd（t）=-14.2~-14.4，²⁰⁸Pb/²⁰⁴Pb变化于38.414~39.334，²⁰⁷Pb/²⁰⁴Pb在15.632~15.681，²⁰⁶Pb/²⁰⁴Pb介于18.568~19.203，显示岩浆源于与洋陆俯冲作用影响有关的EMⅡ型地幔源，形成于南北拉张背景下沿深大断裂引起的岩石圈地幔局部部分熔融.岩石具有较高Au（平均值为6.8×10^-9）和F（平均值2 450×10^-6）浓度，对全吉地块东部金矿成矿作用十分有利.
- 青藏高原 /
- 全吉地块 /
- 白垩纪 /
- 煌斑岩 /
- EMⅡ型地幔源 /
- 岩石学
Abstract: Cretaceous formation records are rare in the northern part of the Tibetan plateau, except for terrestrial sedimentary basins, with only few magmatic activities reported, let alone mantle-derived magmatic activities. The lamprophyres exposed in the Shaliuquan area, the eastern part of the Quanji block, were firstly discovered by field work, which were subjected to a large scale mapping, major and trace element analyses, precise zircon SHRIMP and LA-ICP-MS U-Pb dating and Sr-Nd-Pb isotopic measurements, aiming to deepen the understanding of the Late Mesozoic geological process in the northern plateau. The results yield the average zircon U-Pb ages of 135.2±1.8 Ma and 132.9±1.3 Ma. The rocks are rich in potassium (K₂O=4.53%-5.25%), magnesium (MgO=7.23%-12.27%) and poor in titanium (0.85%-1.29%), showing potassium calc-alkaline. They are also enriched in large ion LILE elements (Rb, Ba, Th, U and Pb) and deficient in high field elements (Nb, Ta and Ti). (⁸⁷Sr/⁸⁶Sr)_i value is 0.718 0-0.718 6. ε_Nd(t) value is -14.2 to -14.4, ²⁰⁸Pb/²⁰⁴Pb is 38.414 to 39.334, ²⁰⁷Pb/²⁰⁴Pb is 15.632-15.681, and ²⁰⁶Pb/²⁰⁴Pb is 18.568-19.203. These data indicate the magma originated from the oceanic subduction-related EMⅡ mantle source and formed from local partial melting of the lithospheric mantle along the deep fracture. The high contents of Au (the mean of 6.8×10^-9) and F (the mean of 2 450×10^-6) of the lamprophyres are very favorable for gold mineralization in the eastern part of the Quanji block.
- Tibetan plateau /
- Quanji block /
- Cretaceous /
- lamprophyre /
- EM Ⅱ mantle source /
- petrology

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图 1 全吉地块及邻区区域构造分区略图

据潘桂棠等（2009）修改

Fig. 1. Outline of regional tectonic zoning of the Quanji block and adjacent areas

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图 2 沙柳泉地区地质简图

1.达肯大坂岩群片麻岩组；2.达肯大坂岩群大理岩组；3.大煤沟组；4.干柴沟组；5.油砂山组；6.第四系；7.晚三叠世石英正长岩；8.晚三叠世二长花岗岩；9.二叠纪闪长岩；10.煌斑岩脉；11.辉绿岩脉；12.闪长玢岩脉；13.伟晶岩脉；14.地质界线；15.角度不整合界线；16.断层；17.采样点及编号

Fig. 2. Geological sketch of Shaliuquan area

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图 3 沙柳泉煌斑岩野外露头（a~d）和镜下特征(e~g)

Fig. 3. Outcrop (a-d) and microscopic characteristics (e-g) of the Shaliuquan lamprophyre

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图 4 沙柳泉煌斑岩的锆石CL图像

Fig. 4. Zircon CL images of the Shaliuquan lamprophyre

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图 5 沙柳泉煌斑岩锆石U-Pb年龄谐和图

图 5a~5c为SHRIMP测年结果；图 5d~5f为LA-ICP-MS测年结果

Fig. 5. Zircon U-Pb concordia diagrams of the Shaliuquan lamprophyre

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图 6 沙柳泉煌斑岩的TAS图解(a)和n(K)-n(K+Na)图解(b)

图a据Rock(1987)，Middlemost（1994）；图b据路凤香等（1991）

Fig. 6. TAS(a) and n(K) vs. n(K+Na) diagrams(b) of the Shaliuquan lamprophyre

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图 7 沙柳泉煌斑岩球粒陨石标准化REE模式图(a)和原始地幔标准化微量元素蛛网图(b)

标准化值据Sun and McDonough（1989）

Fig. 7. Chondrite-normalized REE patterns(a) and primitive mantle-normalized spidergrams of the Shaliuquan lamprophyre (b)

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图 8 沙柳泉煌斑岩La/Yb-Nb/Ta图解（a）和Nb/U-Nb图解(b)

图b据姜耀辉等（2006)

Fig. 8. La /Yb vs. Nb/Ta (a) and Nb/U vs. Nb diagrams of the Shaliuquan lamprophyre (b)

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图 9 沙柳泉煌斑岩ε_Nd(t)-(⁸⁷Sr/⁸⁶Sr)_i相关图解(a)和²⁰⁷Pb/²⁰⁴Pb-²⁰⁶Pb/²⁰⁴Pb相关图解(b)

图a地幔分区据Zindler and Hart（1986)；图b据Rollison（2000）

Fig. 9. ε_Nd(t) vs. (⁸⁷Sr /⁸⁶Sr)_i (a) and ²⁰⁷Pb/ ²⁰⁴Pb vs. ²⁰⁶Pb /²⁰⁴Pb for the lamprophyres (b)

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表 1 沙柳泉煌斑岩LA-ICP-MS锆石U-Pb同位素测定结果

Table 1. LA-ICP-MS U-Pb isotopic compositions of zircons for the lamprophyre from Shaliuquan area

Spot No.	Th	U	Th/U	同位素比值						年龄(Ma)
Spot No.	（10^-⁶）		Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
1	441	333	1.32	0.049 6	0.002 3	0.138 7	0.005 9	0.020 3	0.000 3	177.6	106.0	131.8	5.3	129.8	1.9
2	497	388	1.28	0.048 1	0.002 4	0.133 6	0.006 1	0.020 5	0.000 3	103.8	116.5	127.3	5.4	130.6	2.1
3	60	318	0.19	0.049 8	0.003 0	0.140 3	0.008 2	0.020 5	0.000 4	183.4	138.2	133.3	7.3	131.0	2.6
4	56	278	0.20	0.049 0	0.002 0	0.138 8	0.005 7	0.020 8	0.000 3	147.7	97.3	132.0	5.1	132.6	2.2
5	46	291	0.16	0.049 1	0.002 4	0.140 1	0.006 5	0.020 9	0.000 3	153.6	114.6	133.2	5.8	133.1	2.1
6	287	381	0.75	0.049 6	0.001 9	0.142 0	0.005 4	0.020 9	0.000 3	174.6	91.4	134.8	4.8	133.3	1.6
7	65	573	0.11	0.048 1	0.002 9	0.139 8	0.008 8	0.021 0	0.000 4	104.7	143.7	132.8	7.8	134.0	2.7
8	46	255	0.18	0.051 2	0.003 3	0.147 5	0.009 7	0.021 0	0.000 5	252.0	149.9	139.7	8.6	134.2	3.0
9	85	2 289	0.04	0.049 5	0.001 7	0.144 0	0.005 2	0.021 1	0.000 3	171.6	79.9	136.6	4.6	134.6	1.8
10	300	381	0.79	0.048 8	0.001 9	0.141 4	0.005 5	0.021 1	0.000 3	140.3	89.5	134.3	4.9	134.6	1.7
11	495	1 123	0.44	0.049 7	0.000 8	0.155 7	0.002 6	0.022 9	0.000 2	178.9	37.9	147.0	2.3	146.0	1.5
12	545	1 238	0.44	0.049 3	0.001 1	0.157 3	0.002 9	0.023 1	0.000 3	162.2	50.1	148.3	2.5	147.1	1.8
13	180	657	0.27	0.050 1	0.001 2	0.159 2	0.003 9	0.023 1	0.000 2	198.6	57.5	150.0	3.4	147.3	1.5
14	643	1 063	0.60	0.049 9	0.001 3	0.160 5	0.004 9	0.023 3	0.000 4	191.0	61.2	151.2	4.3	148.5	2.8
15	308	989	0.31	0.048 3	0.001 0	0.156 3	0.003 4	0.023 4	0.000 3	113.0	50.7	147.4	3.0	148.9	1.9
16	172	932	0.18	0.050 3	0.001 5	0.239 9	0.007 0	0.034 7	0.000 5	210.8	70.8	218.4	5.7	219.8	3.0
17	116	829	0.14	0.053 6	0.001 6	0.272 0	0.010 2	0.036 7	0.000 8	356.1	69.3	244.3	8.1	232.4	5.2
18	1 256	899	1.40	0.051 1	0.001 4	0.259 6	0.007 7	0.036 8	0.000 4	243.2	63.0	234.4	6.2	233.2	2.5
19	449	388	1.16	0.051 5	0.001 4	0.265 4	0.006 8	0.037 5	0.000 4	261.1	61.5	239.0	5.4	237.3	2.3
20	0	5 655	0.00	0.050 9	0.000 5	0.264 0	0.003 1	0.037 7	0.000 4	237.5	21.2	237.9	2.5	238.3	2.4
21	2 150	1 586	1.36	0.055 4	0.000 8	0.290 6	0.004 9	0.038 2	0.000 4	426.6	30.6	259.0	3.8	241.7	2.5
22	568	528	1.08	0.053 3	0.001 3	0.305 9	0.007 6	0.041 7	0.000 5	341.4	56.0	271.0	5.9	263.3	3.0
23	63	158	0.40	0.052 0	0.002 4	0.312 9	0.013 3	0.044 1	0.000 6	287.2	104.3	276.4	10.3	278.2	4.0
24	137	149	0.92	0.055 0	0.001 3	0.514 8	0.012 4	0.068 2	0.000 7	410.4	54.5	421.7	8.3	425.1	4.1
25	394	331	1.19	0.055 4	0.001 2	0.521 0	0.010 8	0.068 3	0.000 7	426.9	48.9	425.8	7.2	425.8	4.5
26	2 597	1872	1.39	0.056 2	0.000 4	0.532 8	0.007 0	0.068 5	0.000 6	460.4	17.5	433.7	4.7	427.2	3.8
27	360	465	0.77	0.056 4	0.001 1	0.541 2	0.010 5	0.069 7	0.000 6	466.8	44.8	439.2	6.9	434.1	3.7
28	602	913	0.66	0.056 3	0.000 8	0.543 6	0.008 4	0.069 9	0.000 8	464.8	30.2	440.8	5.5	435.7	4.8
29	258	339	0.76	0.055 4	0.001 1	0.536 7	0.009 8	0.070 2	0.000 7	430.3	43.1	436.2	6.5	437.1	4.0
30	526	577	0.91	0.056 6	0.001 4	0.548 4	0.013 7	0.070 2	0.000 8	476.0	54.0	444.0	9.0	437.3	5.0
31	448	399	1.12	0.054 8	0.001 7	0.532 1	0.017 5	0.070 2	0.001 1	405.7	67.7	433.2	11.6	437.3	6.4
32	320	386	0.83	0.055 8	0.001 3	0.539 0	0.015 4	0.070 2	0.001 1	442.4	53.5	437.8	10.2	437.5	6.4
33	258	282	0.91	0.055 8	0.001 3	0.540 2	0.012 0	0.070 3	0.000 7	445.9	50.1	438.5	7.9	438.0	4.3
34	337	406	0.83	0.055 2	0.001 0	0.537 3	0.010 6	0.070 4	0.000 8	419.6	40.4	436.6	7.0	438.7	4.5
35	1 204	963	1.25	0.055 9	0.001 4	0.542 5	0.014 1	0.070 4	0.001 0	450.0	56.4	440.1	9.3	438.8	6.2
36	178	157	1.14	0.056 6	0.002 5	0.548 3	0.025 4	0.070 5	0.001 4	475.4	96.7	443.9	16.7	439.4	8.5
37	498	630	0.79	0.055 9	0.001 4	0.550 0	0.020 0	0.070 9	0.001 3	448.5	55.8	445.0	13.1	441.5	7.6
38	486	650	0.75	0.055 9	0.000 9	0.547 5	0.009 2	0.070 9	0.000 6	446.5	36.2	443.3	6.0	441.7	3.8
39	21	955	0.02	0.058 0	0.001 6	0.568 8	0.022 9	0.070 9	0.001 6	530.7	58.9	457.3	14.8	441.8	9.5
40	305	470	0.65	0.055 3	0.000 9	0.542 7	0.010 4	0.071 0	0.000 7	424.5	36.9	440.2	6.9	442.2	4.0
41	137	93	1.48	0.056 6	0.001 7	0.548 9	0.015 5	0.071 1	0.000 9	477.6	66.7	444.3	10.2	443.0	5.6
42	292	351	0.83	0.055 1	0.001 5	0.543 1	0.017 9	0.071 2	0.001 1	416.9	60.9	440.5	11.7	443.6	6.8
43	94	207	0.46	0.058 5	0.002 3	0.698 3	0.030 1	0.086 4	0.001 6	550.2	86.7	537.8	18.0	534.4	9.8
44	251	348	0.72	0.069 5	0.000 8	1.442 3	0.017 9	0.150 3	0.001 2	913.6	24.4	906.7	7.4	902.5	6.9
45	41	296	0.14	0.070 4	0.001 1	1.527 5	0.021 6	0.157 0	0.001 6	939.9	30.7	941.5	8.7	940.2	8.8
46	85	519	0.16	0.070 2	0.001 6	1.530 3	0.039 2	0.157 5	0.001 9	933.2	47.4	942.6	15.7	942.6	10.8
47	93	555	0.17	0.080 8	0.001 3	2.329 4	0.036 1	0.208 7	0.001 9	1 216.9	31.6	1 221.3	11.0	1 221.9	9.9
48	90	444	0.20	0.080 7	0.001 4	2.368 6	0.049 9	0.212 5	0.003 0	1 213.7	34.4	1 233.2	15.0	1 242.1	15.9
49	203	494	0.41	0.082 2	0.001 1	2.421 2	0.058 3	0.212 6	0.003 1	1 251.1	26.1	1 248.9	17.3	1 242.7	16.3
50	366	393	0.93	0.087 7	0.000 8	2.847 2	0.026 6	0.235 3	0.002 3	1 375.6	17.4	1 368.1	7.0	1 362.0	11.8
51	39	545	0.07	0.113 2	0.001 1	5.327 2	0.056 6	0.340 5	0.003 0	1 851.8	17.7	1 873.2	9.1	1 888.9	14.6
52	132	266	0.50	0.113 9	0.001 8	5.370 4	0.098 8	0.340 8	0.003 5	1 861.9	29.3	1 880.1	15.8	1 890.3	16.9
53	65	138	0.47	0.157 3	0.001 6	9.668 7	0.137 7	0.445 8	0.005 0	2 426.5	17.3	2 403.7	13.1	2 376.4	22.2
54	337	730	0.46	0.157 0	0.002 0	9.743 9	0.166 6	0.447 4	0.006 1	2 423.2	21.1	2 410.9	15.7	2 383.5	27.3
55	297	144	2.06	0.158 6	0.001 4	10.203 9	0.138 1	0.466 8	0.005 1	2 441.2	15.3	2 453.4	12.5	2 469.5	22.4
56	96	171	0.56	0.161 5	0.001 3	10.469 6	0.096 7	0.469 4	0.003 1	2 471.8	13.4	2 477.2	8.6	2 480.8	13.8

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表 2 沙柳泉煌斑岩主量元素（%）、微量和稀土元素（10^-6）化学成分分析结果

Table 2. Major (%) and trace and REE element (10^-6) abundances of the Shaliuquan lamprophyre

送样号	AMNG GS2-1	AMNG GS2-2	AMNG GS2-3	AMNG GS4-1	AMNG GS4-2	AMNG GS4-3	SLQ GS1-1	SLQ GS1-2	SLQ GS1-3	SLQ GS1-4
SiO₂	51.22	51.65	52.10	51.54	46.73	52.18	48.53	48.83	48.71	48.77
TiO₂	0.90	0.96	1.02	0.93	1.29	0.89	0.87	0.90	0.85	0.90
Al₂O₃	10.37	11.05	11.48	10.68	11.80	10.33	11.36	11.54	11.29	11.40
Fe₂O₃	1.51	1.62	1.24	1.61	2.07	1.55	1.86	2.03	1.97	2.38
FeO	5.00	5.05	5.00	5.30	6.00	5.20	5.40	5.20	5.20	5.00
MnO	0.11	0.10	0.10	0.11	0.27	0.11	0.13	0.13	0.13	0.13
MgO	11.39	11.50	10.79	12.27	7.23	11.82	9.82	9.02	9.64	9.52
CaO	7.49	6.36	6.41	6.42	8.53	6.76	7.37	7.35	7.48	7.27
Na₂O	1.17	1.33	1.50	1.13	1.04	1.08	2.11	2.27	2.17	2.15
K₂O	4.64	5.01	5.25	4.78	4.53	4.72	4.96	5.08	4.91	5.02
P₂O₅	0.55	0.57	0.65	0.57	0.78	0.53	0.57	0.58	0.55	0.57
H₂O⁺	2.67	2.78	2.33	2.96	3.84	2.80	1.99	2.06	1.99	1.98
CO₂	2.36	1.39	0.87	1.03	3.29	1.39	2.98	2.47	2.98	4.32
LOST	4.94	3.76	3.41	3.70	8.60	4.19	5.74	5.79	5.87	5.85
H₂O^-	0.92	0.86	0.76	0.89	0.79	0.95	0.51	0.47	0.45	0.47
Sc	19.57	20.08	19.68	19.74	26.84	19.53	20.92	22.54	21.95	22.74
Li	48.90	45.90	41.68	50.83	52.29	49.63	13.41	11.96	12.11	12.58
Be	6.49	6.78	6.84	6.59	5.46	6.63	5.86	8.24	5.66	6.24
Co	34.74	35.27	34.55	37.22	32.84	37.04	34.46	31.70	32.95	33.76
Rb	177.0	208.7	257.4	138.5	207.2	179.5	128.2	214.5	108.7	160.8
Zr	354.0	382.5	378.1	369.3	444.9	354.3	350.1	341.7	341.1	348.2
Nb	11.14	21.66	20.99	10.29	7.01	7.64	13.45	9.80	6.69	10.62
Hf	8.0	8.4	8.5	8.2	9.6	7.9	7.5	7.3	7.3	7.5
Ta	0.80	1.87	1.62	0.74	0.55	0.65	0.82	0.65	0.36	0.66
Th	65.03	86.81	85.68	77.65	86.82	78.12	80.05	63.17	51.73	61.87
U	12.62	12.97	13.77	12.83	19.32	13.70	15.81	15.66	15.13	14.45
Ba	1 469	1 484	1 634	1 421	1 280	1 449	3 287	3 447	3 078	3 417
Cr	554.3	593.4	513.7	686.3	377.7	644.6	425.9	424.5	447.3	408.1
Ni	186.3	186.1	169.9	208.6	78.96	197.4	193.9	161.9	188.3	182.7
Sr	366.6	395.8	448.0	352.5	560.0	347.7	834.7	897.2	833.8	844.4
V	99.10	103.5	111.0	104.5	146.9	98.69	143.1	144.1	138.2	140.9
F	2542	2629	2476	2735	4134	2855	1737	1847	1761	1789
Sn	6.94	7.79	10.77	5.72	6.36	5.46	4.81	4.93	4.83	7.19
Au	12.5	17.2	13.8	9.4	2.2	5.6	2.2	2.7	1.4	1.3
La	64.40	64.16	64.43	62.17	76.06	62.44	104.9	113.2	110.9	117.1
Ce	151.0	139.9	105.1	146.9	81.15	135.8	223.9	246.2	234.7	250.5
Pr	21.29	21.33	22.92	20.76	26.23	20.56	28.08	31.24	29.75	31.68
Nd	91.05	93.22	101.4	88.94	118.3	88.86	109.8	119.7	115.1	122.4
Sm	18.03	18.69	20.32	17.63	23.19	17.66	17.20	18.88	18.14	19.04
Eu	3.07	3.27	3.72	2.91	3.81	2.90	3.29	3.60	3.47	3.67
Gd	10.99	11.46	11.93	10.68	13.34	10.48	10.96	12.01	11.46	12.22
Tb	1.37	1.37	1.50	1.32	1.66	1.30	1.39	1.52	1.45	1.54
Dy	6.15	6.35	6.68	6.12	7.72	5.95	6.51	7.13	6.78	7.21
Ho	0.98	1.02	1.08	0.98	1.29	0.97	1.10	1.21	1.14	1.21
Er	2.32	2.37	2.50	2.30	3.15	2.26	2.61	2.91	2.72	2.90
Tm	0.33	0.34	0.36	0.33	0.44	0.32	0.38	0.41	0.39	0.42
Yb	2.03	2.04	2.08	2.01	2.77	1.94	2.35	2.60	2.52	2.63
Lu	0.30	0.30	0.32	0.30	0.43	0.29	0.38	0.41	0.39	0.42
Y	27.37	27.72	29.31	26.73	34.89	26.23	29.05	32.00	30.40	32.19
∑REE	373.3	365.8	344.4	363.3	359.6	351.7	512.9	561.0	538.9	572.95
(La/Yb)n	21.44	21.18	20.86	20.84	18.50	21.74	30.11	29.39	29.66	30.01
δEu	0.62	0.63	0.67	0.60	0.61	0.60	0.69	0.68	0.69	0.69
Mg#	76.3	76.1	76.0	76.6	62.3	76.3	71.4	69.8	71.3	70.6
注：样品AMNG GS2 1、2、3岩性为斜闪煌斑岩；AMNG GS4 1、2、3为云煌斑岩；SLQ GS1 1、2、3、4为球颗状云母角闪煌斑岩.

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表 3 沙柳泉煌斑岩全岩Sr-Nd-Pb同位素组成

Table 3. Sr-Nd-Pb isotopic compositions of the Shaliuquan lamprophyre

样品号	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	2σ	(⁸⁷Sr/⁸⁶Sr)_i	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	2σ	(¹⁴³Nd/¹⁴⁴Nd)_i	t(Ma)	ε_Nd(t)	t_DM1	t_DM2	²⁰⁶ Pb/²⁰⁴Pb	²⁰⁷ Pb /²⁰⁴ Pb	²⁰⁸Pb/²⁰⁴ Pb
SLQ GS1-1	0.444 8	0.719 31	0.000 004	0.718 5	0.094 62	0.511 81	0.000 002	0.511 73	133	-14.4	1 716	2 101	19.203	15.67	39.215
SLQ GS1-2	0.692 4	0.719 33	0.000 003	0.718 0	0.095 34	0.511 82	0.000 002	0.511 74	133	-14.2	1 709	2 079	18.568	15.632	38.414
SLQ GS1-3	0.377 6	0.719 36	0.000 003	0.718 6	0.095 23	0.511 82	0.000 002	0.511 74	133	-14.2	1 709	2 082	19.193	15.672	39.217
SLQ GS1-4	0.551 5	0.719 58	0.000 003	0.718 5	0.093 97	0.511 82	0.000 003	0.511 74	133	-14.2	1 690	2 079	19.312	15.681	39.334

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