东天山地区黄山东与香山镁铁质- 超镁铁质杂岩体对比

陈继平; 廖群安; 张雄华; 罗婷; 郭东宝; 胡兆初

doi:10.3799/dqkx.2013.117

东天山地区黄山东与香山镁铁质- 超镁铁质杂岩体对比

doi: 10.3799/dqkx.2013.117

陈继平^{1, 2,},
廖群安^2, ,,
张雄华²,
罗婷²,
郭东宝²,
胡兆初³

1.
陕西省地质调查中心, 陕西西安 710016
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074

基金项目:

中国地质调查局地质调查工作项目 1212011085469

详细信息

作者简介:
陈继平(1987-), 硕士研究生, 主要从事矿物学、岩石学、矿床学研究.E-mail: dddxycjp@163.com

通讯作者:
廖群安, E-mail: qanliao@cug.edu.cn

中图分类号: P595;P597
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出版历程
- 收稿日期: 2012-12-01
- 刊出日期: 2013-06-01

Contrast of Huangshandong and Xiangshan Mafic-Ultramafic Complex, East Tianshan

1.
Shaanxi Center of Geological Survey, Xi'an 710016, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 黄山东与香山镁铁质-超镁铁质杂岩体隶属于东天山北部黄山-镜儿泉镁铁质-超镁铁质岩带, 受北东东走向的黄山-镜儿泉韧性剪切带控制, 二者岩石组成差异较大, 黄山东杂岩主要由辉石橄榄岩和辉长岩组成, 主量元素化学组成属钙碱性-拉斑玄武系列, 而香山杂岩主要由辉石橄榄岩、橄榄辉石岩、角闪辉长岩、辉绿岩组成, 属拉斑玄武系列.微量元素地球化学特征显示二者相对富集大离子亲石元素(K、Sr、Ba), 高场强元素(Pb、U), 而相对亏损高场强元素(Nb、P), 适度亏损(Zr、Hf), 但其稀土配分模式不同, 黄山东杂岩显示轻稀土弱富集, 具OIB型的特征, 而香山岩体为平坦型.二者均为尖晶石稳定域不同熔融程度的产物, 侵位过程中主要发生了橄榄石、辉石、斜长石的分离结晶和不同程度的地壳混染.采用LA-ICP-MS法获得黄山东辉长岩与香山角闪辉长岩锆石U-Pb年龄分别为277±1.1 Ma、285±1.1 Ma.二者形成于相同的构造背景下, 是岩石圈地幔根部发生拆沉, 软流圈地幔物质底侵并导致岩石圈地幔发生部分熔融的产物, 构造环境为后碰撞向板内阶段转变的岩石圈间歇性伸展期.
- 镁铁质-超镁铁质杂岩体 /
- 黄山东 /
- 香山 /
- 锆石 /
- 岩浆源区 /
- 后碰撞伸展 /
- 地球化学
Abstract: Controlled by the NEE-trending Huangshan-Jingerquan ductile sheer zone, the Huangshandong and Xiangshan mafic-ultramafic complex belongs to the Huangshan-Jingerquan mafic-ultramafic rock belt located in the north of East-Tianshan. Huangshandong is characterized by being of calc-alkalic and tholeiitic series and being composed of pyroxene peridotite and gabbro, whereas Xiangshan mafic-ultramafic rocks are made up of pyroxene peridotite, olivine pyroxenite, hornblende gabbro and diabase, belonging to the tholeiitic series. Both rocks are enriched in large ion lithophile elements (such as K, Sr, Ba) and high field strength elements (such as Pb, U), depleted in high field strength elements (such as Nb, P) and slightly depleted in high field strength elements (such as Zr, Hf). However, they are different in the REE pattern, with Huangshandong showing the enrichment of LREE, similar to OIB features, while the Xiangshan rocks presenting the flat pattern of REE. They are the result of partial melting from the spinel source region and magma experienced olivine, pyroxene, plagioclase and amphibole. But they are subject to crust assimilation contamination to a different extent.Using the LA-ICP-MS method, we obtain the age of Huangshandong and Xiangshan at 277±1.1 Ma and 285±1.1 Ma respectively, which demonstrates they generated from the same tectonic setting, resulted from the lithospheric delamination at the root and the upwelling of asthenosphere in the partial melting of lithospheric mantle, corresponding to post-collision intermittent extension setting.
- mafic-ultramafic complex /
- Huangshandong /
- Xiangshan /
- zircon /
- magma source /
- post-collision extension /
- geochemistry

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图 1 新疆与岩浆型Cu-Ni(PGE)硫化物矿床有关的镁铁-超镁铁岩体分布(据王京彬和徐新，2006)

Fig. 1. Distribution of magmatic Cu-Ni (PGE) sulphide-bearing mafic-ultramafic intrusions in northern Xinjiang

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图 2 黄山地区地质略图(据新疆1∶250 000沁城幅建造构造图改编)

1.花岗岩体；2.辉长岩-闪长岩体；3.辉长岩体；4.闪长岩体；5.下石炭干墩组；6.下石炭梧桐窝子组；7.长城系星星峡群；8.第三系；9.断裂；10.金矿点；11.铜镍矿点；12.研究区

Fig. 2. Geological sketch of Huangshan area

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图 3 黄山东-香山超镁铁-镁铁质岩石典型结构显微照片

Ol.橄榄石；Cpx.单斜辉石；Opx.斜方辉石；Pl.斜长石；Hb.角闪石；Opa.不透明矿物

Fig. 3. The typical textures of ultramafic-mafic rocks from Huangshandong and Xiangshan

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图 4 SiO₂-FeO_t/MgO与La-La/Sm图

Fig. 4. SiO₂-FeO_t/MgO and La-La/Sm diagrams

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图 5 镁铁质-超镁铁质岩稀土元素球粒陨石标准化配分曲线(a)和微量元素原始地幔标准化蛛网图(b) (标准化数据Sun and McDonough, 1989)

Fig. 5. Chondrite-normalized rare earth element patterns (a) and primitive mantle-normalized trace element patterns (b)

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图 6 锆石CL图像

Fig. 6. CL images of zircons

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图 7 锆石U-Pb谐和图

Fig. 7. Concordia U-Pb diagram of zicons from the mafic-ultramafic rocks

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图 8 黄山镁铁质-超镁铁质杂岩岩浆源区判别图

Fig. 8. Discriminating figure of magma source from the mafic-ultramafic rocks

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图 9 Mg^#对Al₂O₃、CaO/Na₂O、CaO/Al₂O₃、Co图解

Fig. 9. Diagram of Mg^# vs. Al₂O₃、CaO/Na₂O、CaO/Al₂O₃、Co

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表 1 黄山东与香山镁铁质-超镁铁质杂岩常量元素(%)和微量元素(10^-6)分析结果

Table 1. The major elements (%) and trace elements (10^-6) of the Huangshan mafic-ultramafic rocks

矿点	黄山东							香山
样号	D017-3	D001-1	D001-2	D003-1	D010	D017-1	D017-2	XS2-2	XS2-5	XS1-5	XS2-3	XS2-6	XS2-4
岩性	辉石橄榄岩			辉长岩				辉石橄榄岩	橄榄辉石岩	角闪辉长岩			辉绿岩
SiO₂	39.20	47.80	46.50	50.00	50.50	54.30	46.30	36.82	41.56	46.34	42.32	46.37	47.65
TiO₂	0.29	0.30	0.32	0.53	2.86	1.08	2.29	0.20	0.35	1.92	4.18	2.25	1.99
Al₂O₃	4.83	3.19	3.35	15.70	14.00	16.80	21.60	12.12	8.94	17.43	14.81	16.87	17.16
Fe₂O₃^T	11.25	9.78	9.52	7.35	12.80	7.34	7.05	10.46	10.57	9.91	15.32	7.30	10.43
MnO	0.15	0.17	0.17	0.13	0.20	0.14	0.09	0.15	0.16	0.17	0.28	0.12	0.18
MgO	31.80	25.90	26.10	9.83	4.57	5.97	6.26	24.22	22.90	7.00	7.64	9.90	8.27
CaO	1.96	8.89	7.96	10.30	7.24	8.46	11.60	5.06	6.97	9.30	10.00	8.22	10.57
Na₂O	0.28	0.44	0.54	2.49	4.03	3.32	2.69	0.20	0.59	4.12	3.46	4.29	2.60
K₂O	0.19	0.15	0.09	0.08	1.74	1.12	0.08	0.03	0.12	0.29	0.23	0.19	0.28
P₂O₅	0.050	0.050	0.020	0.070	0.530	0.160	0.020	0.001	0.022	0.342	0.001	0.051	0.002
LOI	2.87	4.82	9.36	2.74	1.14	1.00	1.71	8.91	6.14	2.09	1.64	3.72	0.84
Total	99.54	99.39	99.36	99.22	99.61	99.69	99.69	98.17	98.32	98.91	99.88	99.28	99.97
FeO	5.51	5.18	7.25	4.50	5.43	5.67	5.60	8.00	8.08	7.58	11.72	5.58	7.98
Mg^#	86.1	86.5	86.8	75.7	45.4	65.5	67.4	84.4	83.5	62.2	53.8	76.0	64.9
δ	0.07	0.11	-0.06	0.94	4.44	1.74	2.33	-0.01	-0.35	-20.00	1.80	5.80	5.90
La	4.0	7.4	4.2	4.9	22.9	10.8	3.0	0.5	1.8	1.8	1.8	7.6	5.0
Ce	7.3	13.1	6.3	9.9	50.9	23.8	5.0	0.9	4.4	4.8	5.6	22.1	14.1
Pr	1.00	1.31	0.76	1.29	6.98	3.29	0.70	0.14	0.67	0.82	1.07	3.54	2.30
Nd	4.6	5.3	3.8	6.2	30.7	14.6	3.5	0.6	3.2	4.6	6.6	17.9	12.1
Sm	1.13	1.20	1.13	1.75	7.19	3.88	1.13	0.20	0.96	1.75	2.36	5.55	4.25
Eu	0.32	0.40	0.41	0.77	2.32	1.30	0.88	0.10	0.38	1.10	1.08	1.92	2.22
Gd	1.21	1.34	1.41	2.09	6.92	4.19	1.43	0.25	1.18	2.29	3.23	6.81	5.46
Tb	0.19	0.23	0.24	0.35	1.05	0.71	0.23	0.04	0.19	0.36	0.50	1.01	0.91
Dy	1.20	1.46	1.53	2.22	5.89	4.27	1.42	0.25	1.22	2.45	3.34	7.13	6.25
Ho	0.24	0.30	0.31	0.43	1.09	0.82	0.28	0.06	0.25	0.50	0.68	1.34	1.18
Er	0.71	0.85	0.91	1.33	3.06	2.47	0.81	0.17	0.70	1.37	1.87	3.86	3.30
Tm	0.11	0.13	0.14	0.19	0.43	0.35	0.11	0.03	0.11	0.21	0.28	0.54	0.45
Yb	0.65	0.78	0.87	1.20	2.75	2.35	0.66	0.17	0.61	1.23	1.62	3.16	2.67
Lu	0.09	0.11	0.12	0.18	0.40	0.32	0.08	0.03	0.09	0.19	0.24	0.46	0.36
Rb	6.4	2.5	1.7	1.5	26.5	33.7	1.3	0.4	3.3	2.1	1.3	1.3	3.3
Ba	49.9	33.9	26.1	26.8	279.0	209.0	53.8	4.7	17.7	90.4	105.5	182.5	116.5
Th	0.63	0.38	0.40	0.76	1.93	2.21	0.19	0.05	0.37	0.39	0.08	0.33	0.05
U	0.22	0.17	2.16	0.28	1.59	0.83	0.06	200.00	1 000.00	2 200.00	1 900.00	1 500.00	2 500.00
Nb	1.2	0.5	0.8	1.2	14.2	3.4	1.2	0.2	0.7	4.2	3.8	2.6	1.9
Ta	0.1	0.1	0.1	0.3	1.1	0.3	0.1	0.1	0.1	0.3	0.3	0.2	0.1
Pb	10	21	36	12	8	15	5	5	5	6	5	14	5
Sr	76.9	66.5	82.7	474.0	625.0	393.0	719.0	126.5	119.5	1 045.0	897.0	1 420.0	497.0
Nd	4.6	5.3	3.8	6.2	30.7	14.6	3.5	0.6	3.2	17.9	4.6	12.1	6.6
P	210	110	120	270	2 380	710	80	40	140	1 620	30	270	40
Zr	36	18	22	46	199	117	17	4	23	50	35	45	25
Hf	1.1	0.6	0.8	1.4	5.7	3.4	0.6	0.2	0.7	1.8	1.1	1.7	0.9
Ti	1 690.00	1 760.00	1 870.00	3 030.00	14 900.00	5 850.00	1.13	360.00	1 610.00	11 000.00	23 900.00	12 100.00	11 850.00
Tb	0.19	0.23	0.24	0.35	1.05	0.71	0.88	0.04	0.19	1.01	0.36	0.91	0.50
Y	7.1	8.1	8.6	12.6	30.9	23.8	11 500.0	1.5	7.4	36.7	13.1	31.8	17.7
注：δ=[w(K₂O+Na₂O)²]/[w(SiO₂)-43]；Mg^#=(MgO/40.31)/(MgO/40.31+Fe₂O₃^T×0.899 8/71.85×0.85)×100.

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表 2 单颗粒锆石LA-ICP-MS测年结果

Table 2. LA-ICP-MS dating results for zircon grains

测点	含量(10^-6)				年龄(Ma)
测点	Pb	Th	U	Th/U	²⁰⁶Pb/²³⁸U	σ	²⁰⁷Pb/²³⁵U	σ	²⁰⁷Pb/²⁰⁶Pb	σ
D003-01	24.3	197.4	467.3	0.42	276.9	3.0	267.0	7.2	183.4	77.8
D003-02	72.1	746.9	1 316.6	0.57	276.6	2.4	293.3	5.3	416.7	48.1
D003-03	21.3	195.5	393.4	0.50	276.1	2.8	292.3	7.9	433.4	72.2
D003-04	29.3	263.0	552.8	0.48	276.8	2.9	280.4	6.8	305.6	63.0
D003-05	44.9	309.0	862.0	0.36	276.8	3.2	307.2	8.3	1 133.0	350.5
D003-06	87.3	1 153.3	1 542.6	0.75	276.3	3.3	265.3	5.4	164.9	45.4
D003-07	24.7	165.0	493.8	0.33	276.4	3.5	265.8	7.6	172.3	70.4
D003-08	69.9	785.4	1 278.0	0.61	276.9	2.5	277.3	5.2	276.0	43.5
D003-09	23.2	171.1	445.7	0.38	279.7	3.8	324.3	10.9	638.9	76.7
D003-10	101.3	1 394.8	1 756.8	0.79	276.7	3.7	277.2	5.5	361.2	111.1
D003-11	78.3	1 256.5	1 317.6	0.95	276.8	2.7	262.8	5.4	146.4	55.5
D003-12	66.9	797.2	1 210.0	0.66	276.9	2.6	272.2	5.5	233.4	53.7
D003-13	26.2	190.3	507.3	0.38	276.0	3.0	276.0	7.6	261.2	70.4
D003-14	45.8	495.3	869.5	0.57	276.5	3.3	275.9	6.2	255.6	53.7
D003-15	72.9	726.2	1 351.0	0.54	276.6	3.0	272.8	5.6	233.4	59.2
D003-16	48.7	512.0	892.8	0.57	276.5	3.0	277.2	6.3	264.9	58.3
D003-17	51.5	560.1	930.7	0.60	276.3	3.7	284.8	8.5	598.2	260.2
D003-18	19.1	138.3	367.8	0.38	277.7	3.3	275.7	7.9	261.2	75.0
D003-19	61.2	701.0	1 109.6	0.63	279.1	2.8	271.1	5.3	190.8	19.4
D003-20	30.3	287.1	564.8	0.51	277.1	2.6	272.5	6.5	227.8	67.6
XS1-1-01	35.8	264.8	692.5	0.38	284.7	2.4	282.4	5.2	333.4	44.4
XS1-1-02	13.1	111.0	243.3	0.46	284.2	2.3	280.7	8.6	261.2	77.8
XS1-1-03	26.7	219.8	525.0	0.42	284.4	2.5	265.1	5.7	101.9	49.1
XS1-1-04	39.3	357.2	744.8	0.48	284.1	1.8	263.4	4.9	76.0	44.4
XS1-1-05	67.0	676.9	1 268.8	0.53	284.2	1.9	281.1	4.0	253.8	33.3
XS1-1-06	51.7	462.1	1 002.5	0.46	284.5	2.0	272.9	3.7	172.3	2.8
XS1-1-07	93.3	1 043.2	1 743.4	0.60	284.9	2.0	276.9	3.6	211.2	27.8
XS1-1-08	26.0	286.2	499.5	0.57	284.6	2.1	282.6	4.7	257.5	40.7
XS1-1-09	51.3	523.8	960.5	0.55	284.8	1.6	305.0	4.3	461.2	34.3
XS1-1-10	34.4	272.0	685.7	0.40	284.7	1.8	266.0	4.3	98.2	42.6
XS1-1-11	69.0	794.7	1 290.9	0.62	284.8	2.4	269.8	3.7	200.1	31.5
XS1-1-12	21.7	177.2	427.9	0.41	284.3	2.4	282.7	6.2	264.9	55.5
XS1-1-13	17.1	161.2	329.9	0.49	284.9	2.2	273.2	7.0	183.4	67.6
XS1-1-14	76.1	1 028.1	1 357.3	0.76	284.4	1.7	291.4	6.1	346.4	33.3
XS1-1-15	32.1	255.4	632.3	0.40	284.9	1.8	265.9	7.2	109.4	36.1
XS1-1-16	20.7	207.5	393.7	0.53	284.2	2.1	268.1	9.4	146.4	62.0
XS1-1-17	35.2	340.4	670.9	0.51	284.3	1.8	263.7	8.1	101.9	50.0
XS1-1-18	69.8	516.0	1 398.4	0.37	284.3	2.1	268.0	6.5	200.1	31.5
XS1-1-19	19.7	134.6	397.6	0.34	284.6	2.4	267.7	7.5	124.2	55.6
XS1-1-20	44.8	450.2	784.0	0.57	305.1	1.7	290.9	5.3	183.4	37.0
XS1-1-21	80.2	1 030.5	1 424.0	0.72	287.5	2.2	289.4	4.2	322.3	35.2

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参考文献(80)

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