甘肃红石泉地区基性岩脉特征及Ar-Ar定年

蓝德初; 张树明; 秦雨; 杨春四; 王利玲; 戚佳伟

doi:10.3799/dqkx.2018.272

甘肃红石泉地区基性岩脉特征及Ar-Ar定年

doi: 10.3799/dqkx.2018.272

蓝德初^1,,
张树明^1,2, ,,
秦雨¹,
杨春四^1,3,
王利玲¹,
戚佳伟¹

1.
东华理工大学核资源与环境省部共建国家重点实验室培育基地, 江西南昌 330013
2.
东华理工大学放射性地质与勘探技术国防重点学科实验室, 江西南昌 330013
3.
中国科学院广州地球化学研究所矿物学与成矿学重点实验室, 广东广州 510640

基金项目:

国家自然科学基金项目 41172079

国家自然科学基金项目 41862006

详细信息

作者简介:
蓝德初(1993—), 男, 硕士研究生, 矿物学、岩石学、矿床学专业

通讯作者:
张树明(1965—), 男

中图分类号: P58
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- 被引次数: 0
出版历程
- 收稿日期: 2018-12-12
- 刊出日期: 2019-11-11

Characteristics and Ar-Ar Dating of Mafic Dykes in Hongshiquan Area, Gansu Province

1.
State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2.
National Defense Key Laboratory of Radioactive Geology and Exploration Technology, East China University of Technology, Nanchang 330013, China
3.
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

摘要

摘要: 基性岩脉是研究地幔和地幔变化的"窗口"，并且与金、铀、金刚石等矿床有重要关系.甘肃红石泉地区产有我国最典型的白岗岩型铀矿床，其中发育有多条基性岩脉.研究区基性岩新鲜面呈灰绿色，具有典型的煌斑结构，块状构造，斑晶矿物主要为角闪石，基质主要由斜长石和黑云母组成，副矿物主要有磁铁矿、磷灰石及锆石等，据此确定基性岩为闪斜煌斑岩.岩石具有富碱、高钾、贫铁以及富集轻稀土元素和大离子亲石元素等地球化学特征，进而判断其属于钾质钙碱性煌斑岩.通过⁴⁰Ar-³⁹Ar全岩测定，获得煌斑岩成岩年龄为237.2±2.6 Ma，煌斑岩的岩浆来源于EMII型富集地幔，形成于板内拉张环境，岩浆在上升侵位过程中遭受了地壳物质的混染，属于早中生代古亚洲洋闭合、陆陆碰撞后伸展的产物.红石泉煌斑岩与铀矿床铀成矿没有直接成因关系，对于铀矿只有后期改造作用.
- 煌斑岩 /
- 岩相学 /
- 地球化学 /
- Ar-Ar定年 /
- 红石泉 /
- 岩石学
Abstract: The basic vein is a "window" for studying mantle and its evolution, and has important relationship with gold, uranium, diamond deposits and the others. The most typical alaskite type uranium deposit in China occurs in Hongshiquan area of Gansu Province among which there are a number of basic veins. The fresh surface of the basic rocks in the study area is gray-green, with typical lamprophyre structure, and massive structure. The porphyry minerals are mainly hornblende, the matrix mainly is composed of plagioclase and biotite, and accessory minerals are mainly magnetite, apatite, zircon etc.. Based on this characteristics, it is determined that the basic rock is diorite lamprophyre. The characteristics of elemental geochemistry ascertain that the lamprophyres are rich in alkali, high in potassium, poor in iron, and enriched in LREE and LILE, indicating that they belong to potash calc-alkaline lamprophyres. The whole-rock ⁴⁰Ar-³⁹Ar dating yields a lamprophyre diagenetic age of 237.2±2.6 Ma. The magma of the lamprophyre originated from EMII-enriched mantle and formed in the intraplate extensional environment. The magma was contaminated with crustal materials during the process of rising emplacement, which was the product of the extension following closure of the Late Asian Paleozoic Paleo-Asian Ocean and continental collision. There is no direct genetic relationship between the uranium metallogenesis of the Hongshiquan lamprophyre and the uranium deposit, but only late-stage transformation of uranium deposits.
- lamprophyre /
- petrography /
- geochemistry /
- Ar-Ar whole-rock dating /
- Hongshiquan /
- petrology

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图 1 甘肃龙首山区域地质及铀矿分布

1.第四系; 2.新近系中晚期; 3.新近系; 4.第三系; 5.上白垩统; 6.下白垩统; 7.石炭系; 8.震旦系; 9.元古界; 10.太古界; 11.华力西期花岗岩; 12.加里东期花岗岩; 13.片麻状花岗闪长岩; 14.花岗闪长岩; 15.区域大断裂; 16.大断裂; 17.砂砾岩型铀矿床、矿点; 18.泥岩型铀矿床、矿点; 19.花岗岩型铀矿床、矿点; 20.碱交代型铀矿床、矿点; 21.地质界线; 22.城市名; 23.地名; 24.研究区.图据203研究所资料(2011)《甘肃地质志》修改

Fig. 1. Distribution of Gansu Longshoushan regional geology and uranium ore

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图 2 红石泉地区地质略图

1.第四系; 2.石炭系; 3.元古界; 4.伟晶状白岗岩; 5.肉红色中粒斑状花岗岩; 6.灰绿色斜长花岗岩-石英闪长岩; 7.煌斑岩; 8断层; 9.采样位.图据核工业西北地质局202大队内部资料修改

Fig. 2. Sketch of ore deposit geology in Hongshiquan area

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图 3 煌斑岩脉照片

图为手标本照片和显微镜下正交偏光.a.岩石新鲜面灰绿色(样品LSS14-46手标本); b.岩石新鲜面灰绿色(样品LSS14-59手标本); c.煌斑结构(样品LSS14-59正交偏光); d.基质矿物(样品LSS14-57正交偏光).Pl.斜长石; Bi.黑云母; Kfs.钾长石

Fig. 3. Lamprophyre vein photographs

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图 4 煌斑岩的(K₂O+Na₂O)-SiO₂(a)和K/Al-K/(K+Na)(b)图解

UML.超铁镁煌斑岩; LL.钾镁煌斑岩; CAL.钙碱性煌斑岩; AL.碱性煌斑岩; Ⅰ.钠质煌斑岩; Ⅰ′.弱钾质煌斑岩; Ⅱ.钾质煌斑岩; Ⅲ.超钾质煌斑岩; Ⅳ.过钾质煌斑岩; Ⅴ.钾镁煌斑岩.图中数据据路凤香等(1991)

Fig. 4. (K₂O+Na₂O)-SiO₂(a) and K/Al-K/(K+Na)(b) diagrams of lamprophyres

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图 5 煌斑岩主量元素Harker图解

Fig. 5. Harker diagrams of the lamprophyres

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图 6 微量元素原始地幔标准化蛛网图

Sun and McDonough(1989)

Fig. 6. Primitive mantle-normalized spider diagrams for trace elements

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图 7 稀土元素球粒陨石标准化配分模式

Taylor and McLenann(1985)

Fig. 7. Chondrite-normalized REE patterns for rare earth elements

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图 8 红石泉煌斑岩⁸⁷Sr /⁸⁶Sr-²⁰⁶Pb/²⁰⁴Pb(a)和¹⁴³Nd /¹⁴⁴Nd-²⁰⁶Pb/²⁰⁴Pb(b)相关图解

EMII.EMII型富集地幔; EMI.EMI型富集地幔; MORB.洋中脊玄武岩; DM.亏损地幔; PREMA.普通地幔; HIMU.具有高U/Pb比值地幔; BSE.全硅酸盐地球数值.底图据Rollison(2000)

Fig. 8. ⁸⁷Sr/⁸⁶Sr-²⁰⁶Pb/²⁰⁴Pb (a) and ¹⁴³Nd/¹⁴⁴Nd-²⁰⁶Pb/²⁰⁴Pb (b) diagrams of the lamprophyres from Hongshiquan area

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图 9 样品全岩⁴⁰Ar/³⁹Ar坪年龄谱(a~c)和等时线年龄(d)

Fig. 9. Whole-rock ⁴⁰Ar/³⁹Ar age spectra (a-c) and sochron age (d) of lamprophyre samples

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图 10 红石泉煌斑岩La/Yb-Nb/Ta图解

据Münker(1998)

Fig. 10. La/Yb-Nb/Ta diagram of lamprophyres from Hongshiquan

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图 11 煌斑岩La/Sm-La图

据管涛等(2003)

Fig. 11. La/Sm-La plot of lamprophyres

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图 12 红石泉地区煌斑岩FeO*-MgO-Al₂O₃(a)、TiO₂-Zr(b)和Zr-Zr/Y(c)构造环境判别图

Ⅰ.洋中脊或洋底玄武岩; Ⅱ.洋岛玄武岩; Ⅲ.大陆玄武岩; Ⅳ.扩张性中央岛玄武岩; Ⅴ.造山带玄武岩; WPB.板内玄武岩; MORB.洋中脊玄武岩; VAB.火山岛弧玄武岩; IAB.岛弧玄武岩.图a据Münker(1998); 图b据李昌年(1992); 图c据Rollison(2000)

Fig. 12. FeO*-MgO-Al₂O₃(a), TiO₂-Zr(b) and Zr-Zr/Y(c) tectonic discrimination diagrams of lamprophyre in Hongshiquan area

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表 1 采样位置及岩性

Table 1. Sampling location and lithology

样品号	坐标			样品岩性
样品号	X	Y	H	样品岩性
LSS14-37	4 297 970	434 739	2 318	闪斜煌斑岩
LSS14-44	4 297 992	434 659	2 347	闪斜煌斑岩
LSS14-46	4 297 999	434 757	2 347	闪斜煌斑岩
LSS14-57	4 298 029	435 151	2 373	闪斜煌斑岩
LSS14-59	4 298 144	435 088	2 460	闪斜煌斑岩

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表 2 红石泉地区煌斑岩Sr、Nd、Pb同位素数据(误差2δ计)

Table 2. Sr, Nd and Pb isotope data of lamprophyres in Hongshiquan area (error 2δ)

样品号	LSS14-37	LSS14-57	LSS13-59
⁸⁷Rb/⁸⁶Sr	1.752 0	1.788 0	1.807 1
¹⁴⁷Sm/¹⁴⁴Nd	0.096 481	0.082 673	0.106 112
⁸⁷Sr/⁸⁶Sr	0.711 956	0.712 965	0.712 828
¹⁴³Nd/¹⁴⁴Nd	0.511279	0.511 837	0.511 994
²⁰⁶Pb/²⁰⁴Pb	18.977	19.461	20.067
²⁰⁷Pb/²⁰⁴Pb	15.557	15.493	15.564
²⁰⁸Pb^/204Pb	38.487	38.767	38.955
(⁸⁷Sr/⁸⁶Sr)_i=237.2	0.706 042	0.706 930	0.706 728
ε_Nd(t=237.2)	-23.49	-12.18	-9.28

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表 3 红石泉地区煌斑岩阶段加热法⁴⁰Ar/³⁹Ar分析结果

Table 3. Lamprophyre phasewise heating method ⁴⁰Ar/³⁹Ar analysis results of Hongshiquan area

T(℃)	(⁴⁰Ar/³⁹Ar)_m	⁽³⁶Ar/³⁹Ar)_m	(³⁷Ar/³⁹Ar)_m	(³⁸Ar/³⁹Ar)_m	⁴⁰Ar(%)	F	³⁹Ar (10^-14 mol)	³⁹Ar (Cum) (%)	Age (Ma)	±1σ (Ma)
LSS14-37 全岩 W=30.77 mg J=0.005 958
800	215.164 7	0.685 8	5.279 4	0.157 6	5.99	12.941 5	0.29	1.60	134.0	3.2
850	90.045 4	0.236 0	1.552 6	0.063 1	22.67	20.435 3	0.54	4.57	207.3	2.9
900	51.357 2	0.093 8	0.177 6	0.031 7	46.03	23.642 1	1.16	10.91	237.7	2.3
940	32.720 4	0.025 8	0.213 4	0.018 2	76.70	25.100 9	1.93	21.45	251.4	2.4
980	31.509 1	0.013 0	0.108 3	0.015 1	87.80	27.668 7	3.93	42.92	275.3	2.6
1010	35.514 6	0.025 6	0.190 2	0.017 6	78.74	27.966 7	1.36	50.35	278.0	2.8
1050	48.236 6	0.054 8	0.273 1	0.024 5	66.44	32.053 8	0.97	55.64	315.3	3.4
1090	57.924 4	0.046 1	0.866 7	0.026 2	76.57	44.386 4	0.81	60.07	423.3	3.8
1130	47.059 8	0.037 5	0.514 6	0.022 3	76.52	36.023 5	1.17	66.47	350.8	3.2
1170	48.588 4	0.038 3	0.798 1	0.023 8	76.82	37.351 2	2.09	77.85	362.5	3.4
1210	48.769 6	0.015 0	0.730 0	0.019 1	90.99	44.402 6	2.23	90.02	423.4	3.8
1300	34.863 7	0.009 9	0.294 5	0.015 5	91.66	31.962 5	1.32	97.22	314.5	3.0
1400	35.534 0	0.030 6	0.141 9	0.016 7	82.91	29.463 0	0.51	100.00	291.8	2.8
LSS14-53 全岩 W=73.71 mg J=0.005 784
800	101.416 5	0.314 7	7.213 7	0.103 4	8.80	8.975 0	0.30	2.09	91.3	5.9
840	48.979 2	0.109 6	2.260 6	0.030 6	34.18	16.772 2	0.37	4.71	167.0	8.2
900	52.147 5	0.113 5	0.914 1	0.039 1	35.78	18.671 4	0.93	11.21	185.0	4.2
950	37.209 4	0.049 4	1.729 6	0.025 9	61.07	22.754 7	0.98	18.12	223.1	2.3
1000	37.419 3	0.044 2	3.023 6	0.026 0	65.66	24.631 0	1.47	28.46	240.3	2.3
1040	45.519 0	0.051 6	6.902 3	0.033 7	67.54	30.917 0	0.94	35.06	296.8	2.8
1080	40.921 5	0.039 4	5.477 1	0.029 8	72.46	29.782 5	1.75	47.32	286.7	2.7
1120	40.048 6	0.040 2	3.382 8	0.026 7	70.92	28.479 2	1.67	59.04	275.1	2.8
1160	41.564 3	0.043 7	2.732 5	0.025 8	69.38	28.902 8	1.31	68.20	278.9	2.7
1200	47.214 2	0.052 4	4.444 6	0.030 5	67.87	32.159 0	1.42	78.15	307.7	2.8
1250	40.451 8	0.027 2	4.289 2	0.025 0	80.90	32.838 5	1.97	91.97	313.7	2.9
1300	65.808 8	0.087 1	11.413 4	0.049 8	62.13	41.268 8	1.03	99.20	386.2	3.5
1400	167.066 2	0.415 5	17.789 3	0.118 7	27.26	46.201 0	0.11	100.00	427.2	6.9
LSS14-59 全岩 W=27.96 mg J=0.005 614
700	340.331 5	1.112 8	1.012 0	0.318 4	3.40	11.589 7	0.02	0.09	114	76
800	45.100 3	0.135 6	0.625 8	0.049 2	11.25	5.075 7	0.41	1.67	50.7	1.3
860	46.887 5	0.117 0	0.134 5	0.038 9	26.26	12.314 5	1.55	7.72	120.6	1.3
900	28.748 4	0.037 3	0.102 6	0.020 3	61.67	17.731 3	1.26	12.62	171.2	1.8
950	26.708 0	0.016 8	0.075 0	0.016 2	81.40	21.742 4	1.37	17.95	207.8	2.0
990	31.363 2	0.026 7	0.220 7	0.018 9	74.89	23.492 8	1.81	25.01	223.5	2.2
1030	45.743 2	0.072 4	0.148 0	0.028 0	53.18	24.331 2	1.99	32.75	231.0	2.2
1070	50.802 9	0.087 6	0.108 8	0.030 8	49.06	24.925 0	2.73	43.39	236.3	2.2
1110	30.289 7	0.018 1	0.075 6	0.016 1	82.30	24.930 5	3.50	57.01	236.3	2.3
1150	27.759 5	0.008 5	0.064 9	0.014 3	90.90	25.234 9	4.64	75.09	239.0	2.2
1200	27.511 3	0.005 5	0.042 1	0.013 7	94.11	25.891 9	3.33	88.04	244.8	2.3
1300	29.118 7	0.005 6	0.037 1	0.013 4	94.32	27.464 1	2.61	98.20	258.7	2.4
1400	30.627 6	0.009 5	0.244 3	0.014 6	91.91	27.849 3	0.46	100.00	262.1	2.9
注：表中下标m代表样品中测定的同位素比值 Total age =311.0 Ma, F=⁴⁰Ar^*/³⁹Ar.

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