南天山英买来花岗岩的地质、地球化学特征及其地质意义

马乐天; 张招崇; 董书云; 张舒; 张东阳; 黄河

doi:10.3799/dqkx.2010.106

南天山英买来花岗岩的地质、地球化学特征及其地质意义

doi: 10.3799/dqkx.2010.106

马乐天^{1, 2,},
张招崇^1, ,,
董书云¹,
张舒¹,
张东阳¹,
黄河¹

1.
中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083
2.
北京大学地球与空间科学学院, 北京大学地质博物馆, 北京 100871

基金项目:

国家科技支撑计划 2007BAB25B05

"111计划" B07011

详细信息

作者简介:
马乐天(1986-), 女, 学士, 地质学专业E-mail: mlt285772317@126.com

通讯作者:
张招崇, E-mail: zczhang@cugb.edu.cn

中图分类号: P596
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- 被引次数: 0
出版历程
- 收稿日期: 2009-11-06
- 刊出日期: 2010-11-01

Geology and Geochemistry of the Yingmailai Granitic Intrusion in the Southern Tianshan and Its Implications

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
School of Earth and Space Sciences, Geological Museum, Peking University, Beijing 100871, China

摘要

摘要: 新疆英买来岩体位于南天山中段, 其主体由黑云母钾长花岗岩组成, 局部有二云母钾长花岗岩, 形成于晚二叠世.岩体中有两种少量椭球状的包体, 一是暗色细粒包体, 二是浅色包体.花岗岩和包体的地球化学特征基本相似, 它们在主量元素特征上以高Si、富K、富碱, 贫Mg、Ca为特征, 微量元素特征上表现为富Rb、Ba、Th以及轻重稀土的高度分馏和Nb、Ta、Zr、Hf等的负异常.花岗岩和包体的Harker图解显示出一致的变化趋势, 表明它们是同源岩浆演化的产物.其A/CNK值为0.99~1.08, 显示出准铝-过铝的特点, 而稀土元素配分曲线则显示出强烈富集轻稀土和明显的负Eu异常.结合其高的(⁸⁷Sr/⁸⁶Sr)_t值(0.71036~0.71585)和负的ε_Nd(t)值(-1.67~-6.45), 推测岩浆起源于壳源含斜长石的角闪石质岩石脱水条件下的部分熔融(深度＜50km), 其母岩浆在就位前发生了以黑云母和斜长石为主伴随有磁铁矿等副矿物的分离结晶作用.英买来花岗岩体的岩石类型以及地球化学特征表明其是介于A型和S型之间的一种过渡类型花岗岩类, 其形成时的构造环境为碰撞晚期或接近碰撞结束向后碰撞过渡阶段.
- 二云母花岗岩 /
- 地球化学 /
- 壳源 /
- 二叠纪 /
- 南天山
Abstract: The Late Permian Yingmailai granitic intrusion is located in the middle part of the southern Tianshan. It consists predominantly of biotite K-feldspar granite with minor two-mica K-feldspar granite. Two types of ellipse-shaped xenoliths including dark-color fine-granular xenolith and light-color granitic xenolith have been recognized in the granitic intrusion. The xenoliths share geochemical similarities with granites. They are characterized by high SiO₂ contents, enrichment of K and total alkali coupled with low MgO and CaO contents. Furthermore, they display the enrichment in Rb, Ba, Th and REE as well as significant fractionation of LREE from HREE, and negative Nb, Ta, Zr and Hf anomalies on the ORG normalized trace element patterns. The similar variation trends of major oxides between granites and xenoliths on the Harker diagram suggest that they derived from a common parental magma. The A/CNK ratios range from 0.99 to 1.08, meta-aluminous to per-aluminous feature. The chondrite-normalized REE patterns are characterized by strong enrichment of LREE relative to HREE and significantly negative Eu anomalies. In combination with their high (⁸⁷Sr/⁸⁶Sr)_t ratios (0.71036 to 0.71585) and negative ε_Nd(t) values (-1.67 to -6.45), it can be inferred that the magmas might have been produced by dehydration melting of crust-source amphibole-bearing mafic rocks (< 50km), and that crystal fractionation of biotite and plagioclase with minor magnetite might have occurred before emplacement. The petrological and geochemical characteristics of the granitic rocks suggest that the intrusion is a transition type between A and S types, and formed in the late or end stage of collision between Tarim and Kazakhstan plate in Late Permian time.
- two-mica granite /
- geochemistry /
- crust source /
- Permian /
- southern Tianshan

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图 1 新疆构造单元划分(a)和英买来岩体地质图(b)(据新疆地质矿产局第八地质大队2008年资料修改)

Ⅲ.塔里木-卡拉库姆板块；Ⅲ₁.塔里木微板块；Ⅲ₁¹.东阿莱-哈尔克古生代复合沟弧带；Ⅲ₁².艾尔宾晚古生代残斜盆地；Ⅲ₁³.阔克塔勒晚古生代陆缘盆地；Ⅲ₁⁴.虎拉山晚古生代裂陷槽；Ⅲ₁⁵.柯坪前陆盆地；Ⅲ₁⁶.库鲁克塔格陆缘地块；Ⅲ₁⁷.塔里木中央地块；1.第四系覆盖；2.阿克苏群片麻岩、浅粒岩、云母片岩；3.二叠纪中粗粒似斑状钾长花岗岩；4.二叠纪粗粒似斑状钾长花岗岩；5.二叠纪细粒花岗闪长岩；6.青白口纪片麻状粗粒二长花岗岩；7.辉绿岩脉；8.岩相界线；9.逆断层及产状；10.采样点

Fig. 1. Tectonic units of Xinjian (a) and geologic map of the Yingmailai intrusion (b)

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图 2 花岗岩中的细粒包体(包体和花岗岩有明显的界线)以及典型的岩相学特征

a.粗粒黑云母钾长花岗岩中的暗色细粒包体，界线清晰(野外照片)；b.粗粒黑云母钾长花岗岩中的浅色花岗质岩石包体(野外照片)；c.暗色细粒包体中黑云母自形程度较高，而其他浅色矿物呈半自形或他形，显示出同结现象(正交偏光)；d.中粗粒黑云母钾长花岗岩中的微斜长石斑晶(正交偏光)；e.中粗粒黑云母钾长花岗岩的基质(正交偏光)；f.粗粒二云母钾长花岗岩中的文象结构(正交偏光)；g.粗粒二云母钾长花岗岩，自形程度较高的白云母分布在微斜长石中(正交偏光)；h.粗粒二云母钾长花岗岩，黑云母自形程度高，白云母与其共生(正交偏光)

Fig. 2. Fine-granular xenolith in the granite (distinct boundary between granite and xenolith can be recognized) and typical petrographic features of the granite and xenolith

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图 3 英买来花岗岩和包体的Harker图解

空心方框为花岗岩样品；实心方框为包体样品

Fig. 3. Harker diagram of the Yingmailai granites and xenoliths

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图 4 英买来花岗岩和包体的球粒陨石标准化曲线(球粒陨石标准化数据据Sun and McDonough, 1989)

两条细虚线之间的区域代表前人测得的该地区钾长花岗岩稀土元素配分曲线范围，据姜常义等(1999)；两条粗虚线之间的区域代表前人测得的南天山西段川乌鲁杂岩体稀土元素配分曲线范围，据黄河等(2010)

Fig. 4. Chindrite-normalized REE patterns of the Yingmailai granites and xenoliths

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图 5 英买来花岗岩和包体的洋脊花岗岩标准化曲线(标准化数据Pearce et al., 1984)

Fig. 5. ORG-normalized trace element patterns of the Yingmailai granites and xenoliths

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图 6 (⁸⁷Sr/⁸⁶Sr)_t-ε_Nd(t)

图解其他地区的年龄数据据徐学义等(2005)

Fig. 6. (⁸⁷Sr/⁸⁶Sr)_t versus ε_Nd(t) diagram

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图 7 Nb-Y和Rb-(Y+Nb)图解(底图据Pearce et al., 1984)

Fig. 7. Diagrams of Nb versus Y and Rb versus Y+Nb

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表 1 英买来花岗岩体和包体的主量元素分析结果(%)

Table 1. Major element analyses of the Yingmailai granites and xenoliths

样品	Q01	Q03	Q04	Q05	Q06	Q07	Q08	Q09	Qab01	Qab03	Qab05	Qabb
SiO₂	73.9	71.3	72.1	74.7	77.6	74.4	77	74.4	75.1	69.9	76.4	66.2
TiO₂	0.11	0.26	0.22	0.12	0.18	0.21	0.15	0.16	0.16	0.59	0.13	0.78
Al₂O₃	13.6	13.91	13.62	13.3	11.25	12.75	11.86	12.51	12.56	13.5	11.91	14.12
Fe₂O₃	1.33	3.27	2.67	1.22	1.88	2.22	1.67	1.64	1.58	5.81	1.63	8.23
FeO	0.92	2.13	1.67	0.94	1.41	1.58	1.14	1.19	1.18	4.49	1.21	6.64
MnO	0.03	0.06	0.05	0.02	0.03	0.03	0.02	0.02	0.02	0.08	0.03	0.11
MgO	0.12	0.18	0.17	0.18	0.21	0.25	0.21	0.19	0.21	0.78	0.19	1.13
CaO	0.84	1.33	1.09	0.75	0.69	0.96	0.81	0.85	0.73	1.88	0.45	2.04
Na₂O	3.39	3.39	3.15	2.96	2.6	2.97	2.74	2.91	2.78	3.73	2.42	4.04
K₂O	5.9	5.6	6.1	6.2	4.8	5.3	4.9	5.4	5.9	3	5.9	2.5
P₂O₅	0.06	0.09	0.08	0.07	0.08	0.09	0.08	0.08	0.07	0.25	0.07	0.33
LOI	0.68	0.49	0.41	0.5	0.38	0.56	0.64	0.54	0.47	0.91	0.5	0.86
SUM	100	99.9	99.7	101.1	99.7	99.1	101.1	99.6	99.6	100.4	99.7	100.3
A/KN	1.14	1.2	1.15	1.14	1.19	1.2	1.2	1.18	1.15	1.44	1.15	1.51
A/CNK	1.011	0.99	0.988	1.024	1.048	1.028	1.048	1.028	1.024	1.057	1.067	1.082
δ	2.774	2.845	2.956	2.672	1.587	2.197	1.733	2.172	2.333	1.671	2.061	1.841
注：A/KN=Al₂O₃/(K₂O+Na₂O)(分子比)；A/CNK=Al₂O₃/(Na₂O+K₂O+CaO)(分子比)；δ=(K₂O+Na₂O)²/(SiO₂-43).

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表 2 英买来花岗岩体和包体的微量元素分析结果(10^-6)

Table 2. Trace element analyses of the Yingmailai granites and xenoliths

样品	Q01	Q03	Q04	Q05	Q06	Q07	Q08	Q09	Qab01	Qab03	Qab05	Qabb
La	54.5	39.3	83.1	42.2	73.2	31.3	34.3	26.7	45	32.3	24.9	32.8
Ce	102	78.3	157	90.4	153	64.3	75	59.4	96.9	69.7	55.7	72.1
Pr	19.6	12.8	25.3	14.4	26.2	10.8	11.7	9.28	15.6	11.3	8.71	11.7
Nd	38.1	32	54.6	32	57.1	25.1	26.6	21.3	38.1	26.3	19.7	28.8
Sm	8.38	7.36	8.45	7.21	8.63	5.75	5.86	4.89	8.32	5.67	4.11	6.63
Eu	3.17	1.96	1.88	0.465	0.408	0.475	0.303	0.224	0.422	0.362	0.205	0.361
Gd	11.5	10.7	12	7.02	11.5	7.2	6.46	4.82	8.1	7.89	5.02	9.51
Tb	1.62	1.59	1.55	1	1.51	1.1	0.841	0.622	1.12	1.23	0.801	1.61
Dy	7.83	7.65	7.51	5.11	7.24	6.04	3.83	3	5.94	6.44	4.58	8.28
Ho	1.36	1.34	1.15	0.958	1.25	1.14	0.641	0.532	1.11	1.07	0.943	1.45
Er	3.15	3.08	2.97	2.39	3.06	2.9	1.48	1.32	2.81	2.53	2.59	3.26
Tm	0.654	0.596	0.482	0.357	0.421	0.425	0.2	0.19	0.413	0.322	0.376	0.417
Yb	3.15	3.1	2.99	2.08	2.39	2.4	1.07	1.08	2.39	1.59	1.98	2.02
Lu	0.461	0.442	0.426	0.303	0.339	0.347	0.152	0.162	0.162	0.345	0.211	0.251
Ba	734	783	762	244	268	315	180	138	219	137	150	145
Cu	176	27.1	85.1	300	235	286	61.2	38.8	19.6	50.6	47.4	167
Sr	49.2	67.2	66.3	33.9	29.5	54.1	25.4	41.8	30.4	29.8	16.8	28.9
V	6.26	5.19	4.44	6.09	6.04	6.49	4.52	3.29	4.16	21	3.38	34.2
Zn	91.8	86.6	88.1	77	63.6	372	548	260	67.3	121	48.2	219
Co	0.487	0.811	0.62	0.674	0.965	1.98	1.19	1.27	0.8	3.45	0.545	6.21
Ga	48.7	49.5	47.3	20.2	22	24.2	21.5	12.1	18.7	15.2	12.8	18.7
Rb	101	154	158	162	151	158	107	87.4	152	173	132	222
Th	22.4	25.9	29.9	29.9	67.5	53.1	34.3	23.7	35.2	31.2	16.2	24.8
U	3.42	3.91	2.84	2.04	5.49	10	2.22	7.46	2.86	0.986	1.11	0.55
Cr	17.3	30.3	14.6	14.6	11.5	24	19.5	21.5	12.6	25.7	10.5	13.4
Ni	2.41	1.69	1.62	2.22	1.66	4.68	14.5	0.223	2.03	2.86	1.78	4.7
Zr	3.34	11.2	13.8	4.67	3.05	6.7	2.58	3.75	2.98	7.16	0.63	3.33
Nb	22.3	39.3	29.4	14.3	20.0	22.7	16.4	16.7	17.8	23.5	17.8	23.1
Hf	0.911	1.84	2.33	1.07	0.366	1.02	0.367	0.486	0.319	0.927	0.098	0.256
Ta	1.25	1.34	1.20	0.98	1.18	0.99	1.27	1.60	0.83	0.90	0.76	0.71
W	5.92	2.92	2.53	2.47	2.02	38.4	3.69	33.3	7.84	5.29	2.16	3.23
Y	35.9	58.9	55.8	21.4	28.4	25.6	14.4	12.3	24.7	23.6	22.6	31.4
∑REE	255.48	200.22	359.41	205.89	346.25	159.28	168.44	133.52	226.39	167.05	129.83	179.19
LREE	225.75	171.72	330.33	186.68	318.54	137.73	153.76	121.79	204.34	145.63	113.33	152.39
HREE	29.73	28.50	29.08	19.22	27.71	21.55	14.67	11.73	22.05	21.42	16.50	26.80
LREE/HRE	7.59	6.03	11.36	9.71	11.50	6.39	10.48	10.39	9.27	6.80	6.87	5.69
(La/Yb)_n	9.56	7.65	15.92	12.89	19.50	8.01	21.32	15.84	25.84	8.73	11.40	12.41
δEu	1.00	0.68	0.58	0.20	0.13	0.23	0.15	0.14	0.16	0.17	0.14	0.14
δCe	1.79	1.48	1.54	1.51	1.60	1.54	1.48	1.48	1.48	1.51	1.48	1.48

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表 3 英买来花岗岩体和包体的Sr和Nd同位素成分

Table 3. Sr and Nd isotopic compositions of the Yingmailai granites and xenoliths

样品	Q01	Q03	Q04	Q05	Q06	Q07	Q08	Q09	Qab 01	Qab 03	Qab 05	Qabb
Rb(10^-6)	107.2	155.1	160.5	158.9	148.7	161.5	110.9	90.23	149.8	170.7	129.8	226.2
Sr(10^-6)	51.23	69.76	63.85	34.71	30.25	52.81	27.32	39.89	29.15	28.53	15.45	31.23
⁸⁷Rb/⁸⁶Sr	6.055	6.781	7.062	14.13	15.14	8.632	12.39	6.139	14.94	17.12	23.18	22.71
⁸⁷Sr/⁸⁶Sr	0.737603	0.740051	0.737133	0.764298	0.765357	0.743812	0.75803	0.735034	0.76403	0.772631	0.795005	0.793691
(⁸⁷Sr/⁸⁶Sr)_t	0.715850	0.715689	0.711762	0.713534	0.710964	0.7128	0.713517	0.712979	0.710356	0.711125	0.711728	0.712102
Sm(10^-6)	7.998	7.235	8.172	7.504	7.954	5.841	5.702	4.775	5.568	5.524	4.156	6.498
Nd(10^-6)	37.23	31.45	53.78	31.96	56.33	23.76	26.81	20.99	33.87	6.094	20.18	27.33
¹⁴⁷Sm/¹⁴⁴Nd	0.1209	0.1201	0.1108	0.1112	0.1013	0.1204	0.1208	0.1195	0.1305	0.1328	0.1259	0.1231
¹⁴³Nd/¹⁴⁴Nd	0.512205	0.512184	0.512217	0.512208	0.512186	0.512179	0.512195	0.512187	0.512441	0.512429	0.512398	0.512323
(¹⁴³Nd/¹⁴⁴Nd)_t	0.512001	0.511981	0.51203	0.51202	0.512015	0.511976	0.511991	0.511985	0.512221	0.512205	0.512185	0.512115
ε_Nd(t)	-5.96	-6.34	-5.39	-5.58	-5.68	-6.45	-6.15	-6.26	-1.67	-1.98	-2.35	-3.73
注：年龄校正采用t=258Ma；(¹⁴³Nd/¹⁴⁴Nd)_CHUR=0.512638；(¹⁴⁷Sm/¹⁴⁴Nd)_CHUR=0.1967；λ_Sr=1.39×10^-11/a；λ_Sm=6.54×10^-12/a.

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表 4 英买来岩体和A型花岗岩特征比较

Table 4. Comparison of the Yingmailai intrusion with A type of granite

	英买来岩体	A型花岗岩	参考文献
Na₂O+K₂O	7.5~9.3	7~11%	Eby(1990)；谭俊等(2008)
CaO	0.7~1.3	＜1.8%
FeO^*/MgO	5~12	8~80
KN/A	0.83~0.88	＞0.85	Whalen(1987)
Zr+Nb+Ce+Y	92~256×10^-6	＞350×10^-6
稀土总量	134~359×10^-6	平均219.03×10^-6
稀土配分形式	“V”字型，重稀土分馏明显	“V”字型，重稀土分馏不明显
(Ga/Al)×10000	1.8~6.7	＞2.5

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参考文献(72)

Allen, M.B., Windley, B.F., Zhang, C., 1993. Palaeozoic collisional tectonics and magmatism of the Chinese Tien Shan, Central Asia. Tectonophysics, 220(1-4): 89-115. doi: 10.1016/0040-1951(93)90225-9
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