东昆仑希望沟橄榄辉石岩LA-ICP-MS锆石U-Pb定年及岩石地球化学特征

孔会磊; 栗亚芝; 李金超; 贾群子; 国显正; 张斌

doi:10.12090/j.issn.1006-6616.2019.25.03.041

东昆仑希望沟橄榄辉石岩LA-ICP-MS锆石U-Pb定年及岩石地球化学特征

doi: 10.12090/j.issn.1006-6616.2019.25.03.041

孔会磊^{1, 2,},
栗亚芝^{1, 2},
李金超^{1, 2},
贾群子^{1, 2},
国显正³,
张斌⁴

1.
中国地质调查局西安地质调查中心, 陕西西安 710054
2.
自然资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710054
3.
中国地质大学(武汉)地质调查研究院, 湖北武汉 430074
4.
宝鸡西北有色七一七总队有限公司, 陕西宝鸡 721012

基金项目:

中国地质调查局地质调查项目 DD20160013

中国地质调查局地质调查项目 12120115022101

中国地质调查局地质调查项目 12120113029000

详细信息

作者简介:
孔会磊(1985-), 男, 硕士, 工程师, 主要从事区域岩浆作用及成矿规律研究。E-mail:konghuilei2008@126.com

中图分类号: P588.1;P597.3
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- 被引次数: 0
出版历程
- 收稿日期: 2018-05-09
- 修回日期: 2018-08-27
- 刊出日期: 2019-06-28

LA-ICP-MS ZIRCON U-PB DATING AND GEOCHEMICAL CHARACTERISTICS OF THE XIWANGGOU OLIVINE PYROXENOLITE IN EAST KUNLUN

KONG Huilei^{1, 2
,},
LI Yazhi^{1, 2},
LI Jinchao^{1, 2},
JIA Qunzi^{1, 2},
GUO Xianzheng³,
ZHANG Bin⁴

1.
Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shannxi, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MNR, Xi'an 710054, Shannxi, China
3.
Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China
4.
Baoji 717 Corps Limited of the NWME, Baoji 721012, Shannxi, China

摘要

摘要: 东昆仑古特提斯域镁铁-超镁铁质岩石的研究极为薄弱，对青海东昆仑东段希望沟镁铁-超镁铁质杂岩体中橄榄辉石岩进行岩相学、地球化学及年代学分析，以期为东昆仑晚古生代-早中生代构造岩浆演化提供新的约束。利用LA-ICP-MS锆石U-Pb定年，获得希望沟橄榄辉石岩加权平均年龄为（262.4±1.6）Ma，表明岩体侵位于中二叠世。岩石地球化学研究显示，希望沟橄榄辉石岩具有较高的Mg^#值（85.31~86.27），m/f比值介于5.50~6.18，属于铁质超基性岩类；具有低TiO₂（0.41%~0.52%）和低Al₂O₃（3.04%~4.57%），属钙碱性系列。岩石富集大离子亲石元素（Rb、Th、U）和Pb，相对亏损高场强元素（Nb、Ta、P、Ti），ΣREE为29.79×10^-6~38.96×10^-6，（La/Yb）_N为1.71~2.51，平均2.15，δEu=0.73~0.86，具有弱的Eu负异常。岩石成因分析表明，岩石源区为被俯冲改造的岩石圈地幔，岩浆在演化过程中遭受了上地壳物质的同化混染作用。结合东昆仑区域构造演化，认为希望沟橄榄辉石岩为阿尼玛卿古特提斯洋俯冲阶段的岩浆记录。
- 地球化学 /
- 锆石U-Pb定年 /
- 希望沟橄榄辉石岩 /
- 东昆仑
Abstract: The mafic-ultramafic rocks in Paleo-Tethys domain of East Kunlun are not well documented. Researches on petrography, geochronology and geochemistry of the olivine pyroxenolite in Xiwanggou mafic-ultramafic intrusion, located in the Eastern Section of East Kunlun in Qinghai Province, can provide new constraints for the Late Paleozoic-Early Mesozoic tectono-magmatic evolution in East Kunlun. LA-ICP-MS zircon U-Pb dating indicates that the weighted mean age of Xiwanggou olivine pyroxenolite is (262.4±1.6) Ma, in the Middle Permian. Lithogeochemical studies show that the olivine pyroxenolite, which is calc-alkaline series, is characterized by high content of Mg^#(85.31~86.27), low content of TiO₂(0.41%~0.52%) and low Al₂O₃(3.04%~4.57%). The m/f ratios range from 5.50 to 6.18, indicative of iron series of ultrabasic rocks. This suite of rocks are enriched in LILE (such as Rb, Th, U) and Pb, relatively depleting in HFSE (such as Nb, Ta, P, Ti). The rocks have low REE contents, with slightly negative Eu anomaly(∑REE=29.79×10^-6~38.96×10^-6, (La/Yb)_N=1.71~2.51, δEu=0.73~0.86). The geochemical characteristics show that the parental magma of olivine pyroxenolite derived probably from the mantle influenced by the subducton. The parental magma is developed by the upper crustal assimilation contamination during the magma evolution. Combined with regional evolutionary characteristics in East Kunlun, the authors consider that the Xiwanggou olivine pyroxenolite ought to be the magmatism records in the subduction of Anyemaqen-Paleo-Tethys ocean.
- geochemistry /
- zircon U-Pb dating /
- Xiwanggou olivine pyroxenolite /
- East Kunlun
注释:

责任编辑:范二平

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图 1 希望沟—哈陇休玛一带镁铁-超镁铁岩地质略图

1—第四系；2—上三叠统鄂拉山组火山岩；3—古元古界白沙河组变质岩系；4—早侏罗世正长花岗岩；5—晚三叠世二长花岗岩；6—二叠纪石英闪长岩；7—二叠纪花岗闪长岩；8—二叠纪二长花岗岩；9—晚奥陶世石英闪长岩；10—辉长岩；11—橄榄岩；12—橄榄辉长岩；13—橄榄辉石岩；14—地质界线；15—不整合界线；16—性质不明断层；17—逆断层；18—采样位置；①—柴达木北缘断裂；②—哇洪山-温泉断裂；③—东昆北断裂；④—东昆中断裂；⑤—东昆南断裂

Figure 1. The sketch geological map of the mafic-ultramafic intrusions in Xiwanggou-Halongxiuma area

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图 2 希望沟橄榄辉石岩的野外露头及显微照片

Pl—斜长石；Opx—斜方辉石；Cpx—单斜辉石；Ol—橄榄石；Hbl—角闪石
a—含长橄榄辉石岩野外露头；b—辉石被褐色角闪石交代(正交偏光)；c—橄榄石常呈网环状结构(正交偏光)；d—斜长石多呈填隙状产出(正交偏光)

Figure 2. Outcrop photos and microphotograghs of the Xiwanggou olivine pyroxenolite

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图 3 希望沟橄榄辉石岩锆石阴极发光照片

Figure 3. CL images of zircons from Xiwanggou olivine pyroxenolite

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图 4 希望沟橄榄辉石岩锆石U-Pb年龄谐和图和加权平均年龄图

Figure 4. Zircon U-Pb concordia diagram and weighted mean ages diagram from Xiwanggou olivine pyroxenolite

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图 5 希望沟橄榄辉石岩的SiO₂-(Na₂O+K₂O)和SiO₂-^TFeO/MgO图解(a底图据文献[23]；b底图据文献[24])

Figure 5. SiO₂-(Na₂O+K₂O) and SiO₂-^TFeO/MgO plots for Xiwanggou olivine pyroxenolite (a is after reference[23]; b is after reference [24])

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图 6 希望沟橄榄辉石岩的微量元素原始地幔标准化蛛网图及稀土元素球粒陨石标准化配分曲线图(标准化数值据文献[25])

Figure 6. Primitive mantle-normalized trace element patterns and chondrite-normalized REE patterns for Xiwanggou olivine pyroxenolite (Normalized data are from reference [25])

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图 7 希望沟橄榄辉石岩源区性质与地壳混染判别图解(a底图据文献[29]；b底图据文献[31])

N-MORB—正常的大洋中脊玄武岩；E-MORB—富集的大洋中脊玄武岩；OIB—洋岛玄武岩

Figure 7. Discrimination diagram of the source characteristics and crustal contamination for Xiwanggou olivine pyroxenolite

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图 8 希望沟橄榄辉石岩构造环境判别图解(a底图据文献[33]；b、c底图据文献[34]；d底图据文献[22])

Figure 8. Tectonic discrimination diagrams for Xiwanggou olivine pyroxenolite

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表 1 希望沟橄榄辉石岩锆石LA-ICP-MS测年结果

Table 1. LA-ICP-MS isotopic data of zircon from Xiwanggou olivine pyroxenolite

样品编号	含量/(×10^-6)		Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
样品编号	Th	U	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄/Ma	1σ	年龄/Ma	1σ	年龄/Ma	1σ
1	325	298	1.09	0.0524	0.0010	0.2973	0.0057	0.0412	0.0005	300.8	43.2	260.2	3.1	264.3	4.5
2	301	361	0.83	0.0511	0.0009	0.2864	0.0051	0.0407	0.0005	243.7	40.6	257.0	3.0	255.7	4.0
3	382	555	0.69	0.0513	0.0008	0.3002	0.0046	0.0425	0.0005	253.3	33.8	268.1	3.0	266.6	3.6
4	210	128	1.64	0.0513	0.0014	0.2880	0.0077	0.0407	0.0005	254.5	61.5	257.3	3.3	257.0	6.1
5	587	569	1.03	0.0517	0.0008	0.2919	0.0046	0.0410	0.0005	271.5	35.2	258.8	2.9	260.1	3.6
6	635	467	1.36	0.0512	0.0008	0.2993	0.0046	0.0424	0.0005	248.1	34.6	267.8	3.0	265.8	3.6
7	346	371	0.93	0.0516	0.0009	0.2902	0.0051	0.0408	0.0005	269.1	39.8	257.6	3.0	258.7	4.0
8	323	335	0.96	0.0518	0.0010	0.2892	0.0057	0.0405	0.0005	274.3	44.6	256.2	3.0	257.9	4.5
9	247	214	1.15	0.0522	0.0013	0.2935	0.0069	0.0408	0.0005	295.3	53.7	257.6	3.2	261.3	5.4
10	350	259	1.35	0.0522	0.0011	0.2937	0.0059	0.0408	0.0005	292.4	46.0	258.0	3.1	261.4	4.7
11	534	620	0.86	0.0526	0.0008	0.2982	0.0046	0.0411	0.0005	312.6	34.6	259.6	2.9	265.0	3.6
12	243	263	0.92	0.0528	0.0010	0.3037	0.0057	0.0417	0.0005	320.2	42.5	263.4	3.1	269.3	4.5
13	530	360	1.47	0.0530	0.0009	0.3059	0.0051	0.0418	0.0005	330.2	37.3	264.2	3.0	271.0	4.0
14	194	158	1.23	0.0506	0.0012	0.2942	0.0066	0.0422	0.0005	220.3	51.8	266.5	3.3	261.8	5.2
15	777	529	1.47	0.0515	0.0009	0.2907	0.0049	0.0409	0.0005	263.6	38.4	258.6	2.9	259.1	3.9
16	298	320	0.93	0.0508	0.0010	0.2882	0.0053	0.0412	0.0005	229.5	42.5	260.1	3.0	257.1	4.2
17	354	275	1.29	0.0535	0.0011	0.3023	0.0059	0.0410	0.0005	348.7	44.3	259.1	3.0	268.2	4.6
18	302	271	1.11	0.0513	0.0010	0.3013	0.0056	0.0426	0.0005	254.2	42.8	268.9	3.1	267.4	4.4
19	566	709	0.80	0.0478	0.0034	0.2759	0.0197	0.0419	0.0010	88.6	160.0	247.4	15.7	264.8	6.4
20	935	536	1.74	0.0470	0.0039	0.2624	0.0222	0.0406	0.0010	47.9	189.2	236.6	17.9	256.4	6.2
21	2415	1602	1.51	0.0530	0.0052	0.3101	0.0306	0.0425	0.0011	328.3	207.9	274.2	23.7	268.3	6.5
22	226	484	0.47	0.0498	0.0043	0.2853	0.0246	0.0416	0.0010	186.3	187.5	254.8	19.4	262.7	6.3
23	701	654	1.07	0.0475	0.0039	0.2768	0.0227	0.0424	0.0010	71.6	182.9	248.1	18.0	267.4	6.4
24	579	761	0.76	0.0502	0.0035	0.2807	0.0197	0.0406	0.0010	203.1	152.9	251.2	15.6	256.8	6.2
25	4058	11366	0.36	0.0497	0.0013	0.2929	0.0086	0.0428	0.0010	180.4	61.7	260.8	6.8	270.2	6.4
26	494	561	0.88	0.0491	0.0037	0.2866	0.0219	0.0424	0.0010	154.2	168.0	255.9	17.3	267.5	6.4
27	749	748	1.00	0.0493	0.0039	0.2747	0.0217	0.0405	0.0010	160.5	173.3	246.4	17.3	255.9	6.1
28	2131	1408	1.51	0.0494	0.0030	0.2725	0.0166	0.0401	0.0010	167.8	134.2	244.7	13.3	253.1	6.0
29	3557	2087	1.70	0.0513	0.0025	0.2991	0.0151	0.0423	0.0010	254.1	108.9	265.7	11.8	267.3	6.4
30	1459	1223	1.19	0.0500	0.0028	0.2794	0.0159	0.0406	0.0010	195.2	125.0	250.2	12.7	256.4	6.1
31	1997	1553	1.29	0.0493	0.0025	0.2734	0.0142	0.0403	0.0010	159.9	114.1	245.4	11.3	254.7	6.1
32	708	842	0.84	0.0528	0.0042	0.3045	0.0247	0.0419	0.0010	318.0	172.6	269.9	19.2	264.7	6.4
33	518	594	0.87	0.0520	0.0054	0.2891	0.0300	0.0404	0.0010	286.5	220.0	257.9	23.7	255.0	6.2
34	592	732	0.81	0.0489	0.0043	0.2822	0.0252	0.0419	0.0010	144.5	195.4	252.4	19.9	264.4	6.4
35	337	769	0.44	0.0523	0.0034	0.3043	0.0201	0.0422	0.0010	299.4	141.5	269.8	15.6	266.6	6.4
36	792	927	0.85	0.0492	0.0053	0.2844	0.0306	0.0420	0.0010	157.6	233.0	254.2	24.2	265.0	6.4
37	913	781	1.17	0.0481	0.0034	0.2681	0.0192	0.0404	0.0010	105.8	159.0	241.1	15.4	255.5	6.1

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表 2 希望沟橄榄辉石岩主量元素(%)和微量元素含量(×10^-6)

Table 2. Contents of major elements(%)and trace elements(×10^-6)of Xiwanggou olivine pyroxenolite

样品号	15XWGH1	15XWGH2	15XWGH3	15XWGH4	15XWGH5	15XWGH6
SiO₂	47.44	47.13	46.84	47.39	46.90	47.15
TiO₂	0.51	0.50	0.41	0.52	0.44	0.48
Al₂O₃	3.85	3.81	4.57	4.11	3.99	3.04
Fe₂O₃	2.71	3.20	2.62	2.57	3.09	2.37
FeO	4.62	4.46	4.96	4.79	4.58	5.11
MnO	0.14	0.14	0.13	0.14	0.14	0.13
MgO	23.16	23.67	24.17	23.36	24.44	25.29
CaO	11.89	11.41	10.78	11.84	10.83	11.24
Na₂O	0.55	0.52	0.61	0.56	0.60	0.46
K₂O	0.23	0.21	0.22	0.22	0.23	0.23
P₂O₅	0.04	0.04	0.04	0.05	0.04	0.04
LOI	4.49	4.54	4.31	4.07	4.35	4.01
Total	99.63	99.63	99.66	99.62	99.63	99.55
Mg^#	85.52	85.31	85.60	85.55	85.67	86.27
m/f	5.79	5.70	5.84	5.81	5.87	6.18
Sc	44.30	43.40	39.40	44.50	40.80	42.60
V	112.00	107.00	91.80	112.00	96.20	109.00
Cr	2140.00	2080.00	1850.00	2110.00	1960.00	2210.00
Ni	302.00	331.00	249.00	314.00	368.00	378.00
Co	71.20	76.40	74.10	72.80	82.50	73.90
Cu	87.50	89.30	23.70	84.70	72.90	243.00
Zn	49.80	47.80	49.90	49.90	53.80	54.10
Rb	10.10	8.44	8.48	8.30	8.48	8.27
Ba	37.50	41.60	51.10	43.40	41.00	37.90
Th	1.30	0.84	0.77	0.74	1.26	1.60
U	0.43	0.38	0.30	0.35	0.44	0.42
Ta	0.10	0.08	0.08	0.09	0.11	0.10
Nb	1.23	1.15	0.95	1.19	1.43	1.32
Pb	6.86	3.59	3.86	7.47	4.84	22.50
Sr	69.30	71.80	116.00	80.40	80.20	56.30
Zr	38.80	37.00	31.70	35.60	43.90	41.60
Hf	1.26	1.11	0.97	1.16	1.16	1.21
Y	13.30	12.50	10.40	13.00	10.80	12.60
La	4.12	3.25	3.12	3.73	3.78	4.41
Ce	11.90	9.69	8.85	10.50	9.94	12.50
Pr	1.77	1.51	1.39	1.66	1.45	1.78
Nd	8.26	7.35	6.59	7.90	6.77	8.16
Sm	2.10	2.03	1.78	2.06	1.70	2.20
Eu	0.62	0.56	0.49	0.64	0.52	0.57
Gd	2.50	2.36	2.02	2.50	2.06	2.60
Tb	0.43	0.41	0.34	0.43	0.36	0.43
Dy	2.73	2.56	2.16	2.66	2.26	2.70
Ho	0.56	0.54	0.44	0.54	0.46	0.54
Er	1.53	1.46	1.19	1.46	1.22	1.42
Tm	0.22	0.22	0.17	0.21	0.18	0.21
Yb	1.40	1.36	1.09	1.30	1.11	1.26
Lu	0.20	0.20	0.16	0.18	0.16	0.18
ΣREE	38.34	33.50	29.79	35.77	31.97	38.96
LREE/HREE	3.01	2.68	2.94	2.85	3.09	3.17
(La/Sm)_N	1.27	1.03	1.13	1.17	1.44	1.29
(Gd/Yb)_N	1.48	1.44	1.53	1.59	1.54	1.71
(La/Yb)_N	2.11	1.71	2.05	2.06	2.44	2.51
δEu	0.83	0.78	0.79	0.86	0.85	0.73
注：Mg^#=100×w(Mg²⁺)/w(Mg²⁺+Fe²⁺), m/f=w(Mg²⁺+Ni²⁺)/w(Fe³⁺+Fe²⁺+Mn²⁺)

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参考文献(47)

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