柴南缘堇青石花岗岩的Nd-Sr-Pb同位素组成及其对岩石成因、源区构造属性和构造演化的启示

巴金; 陈能松; 王勤燕; 王新宇; 张璐; 王树庆

doi:10.3799/dqkx.2012.S1.008

柴南缘堇青石花岗岩的Nd-Sr-Pb同位素组成及其对岩石成因、源区构造属性和构造演化的启示

doi: 10.3799/dqkx.2012.S1.008

巴金^{1, 2},
陈能松^{1, 3, ,},
王勤燕¹,
王新宇⁴,
张璐^{1, 2},
王树庆⁵

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
中国地质大学研究生院, 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
4.
广西壮族自治区地质勘查总院, 广西南宁 530023
5.
中国地质调查局天津地质调查中心, 天津 300170

基金项目:

国家自然科学基金项目 40972042

国家自然科学基金项目 40772041

国家自然科学基金项目 40234052

教育部科技重点项目 104039

详细信息

作者简介:
巴金(1985-), 男, 硕士研究生, 矿物学、岩石学、矿床学专业

通讯作者:
陈能松, E-mail: nengsongchen@cug.edu.cn

中图分类号: P581;P595;P597
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- PDF下载量: 20
- 被引次数: 0
出版历程
- 收稿日期: 2011-07-13
- 网络出版日期: 2021-11-15
- 刊出日期: 2012-05-01

Nd-Sr-Pb Isotopic Compositions of Cordierite Granite on Southern Margin of the Qaidam Block, NW China, and Constraints on Its Petrogenesis, Tectonic Affinity of Source Region and Tectonic Implications

BA Jin^{1, 2},
CHEN Neng-song^{1, 3
, ,},
WANG Qin-yan¹,
WANG Xin-yu⁴,
ZHANG Lu^{1, 2},
WANG Shu-qing⁵

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Graduate School, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
Guangxi Institute of Geological Survey, Nanning 530023, China
5.
Tianjin Center of Geological Survey, China Geological Survey, Tianjin 300170, China

摘要

摘要: 金水口堇青石花岗岩是迄今在青藏高原东北缘发现的唯一的一个强过铝质花岗岩岩体, 含堇青石、石榴子石和黑云母等镁铁质矿物, 属于镁铁质过铝质花岗岩.但目前对该岩体的成因机制及其对基底源区的构造属性和构造演化意义尚缺乏深入研究.为此, 本文以详细的地质学和岩相学研究为基础, 综合开展了元素和Nd-Sr-Pb同位素地球化学研究.金水口堇青石花岗岩的A/CNK=1.12~2.05, K₂O/Na₂O=0.44~2.99, 富Rb、Th、U, 贫Sr、Ba, Rb/Sr=0.42~1.23, Nb/Ta=11.88~15.30, 显示明显的负Eu异常(δEu=0.41~1.01, 平均0.62), 全岩I_Sr值=0.711 4~0.750 3, ε_Nd(t)=-9.30~-13.32.这表明, 该岩体的岩浆是由地壳上部含黑云母的变质杂砂岩部分熔融而成, 高的熔融温度但较浅的熔融深度表明存在额外热源, 暗示加里东热构造事件晚期在柴南缘发生过俯冲板片拆沉、软流圈地幔上隆、基性岩浆上侵和底侵等深部过程.金水口堇青石花岗岩的二阶段亏损地幔Nd模式年龄为1.9~2.2 Ga, 初始铅同位素比值²⁰⁶Pb/²⁰⁴Pb为18.181~18.389、²⁰⁷Pb/²⁰⁴Pb为15.582~15.632、²⁰⁸Pb/²⁰⁴Pb为37.914~38.243, 表明柴达木地块基底可能具有扬子陆块的构造属性.
- 堇青石花岗岩 /
- Nd-Sr-Pb同位素 /
- 岩石成因 /
- 基底构造属性和演化 /
- 柴达木地块 /
- 地球化学 /
- 岩石学
Abstract: The Jinshuikou cordierite granite (JCG) is the only strong peraluminous granite pluton discovered so far on northwestern margin of the Tibetan plateau. This cordierite granite contains mafic minerals of cordierite, garnet and biotite, characterizing mafic peraluminous granite. However, more comprehensive investigations of its genetic mechanism and implications for affinity and tectonic evolution of the basement of the Qaidam block is needed. This paper studies systematically on major and trace elements and Nd-Sr-Pb isotopic geochemistry of the JCG following the geology and petrographical observation. The JCG pluton shows A/CNK=1.12-2.05, K₂O/Na₂O=0.44-2.99, Rb/Sr=0.42-1.23, Nb/Ta=11.88-15.30, and is enriched in Rb, Th and U, but depleted in Sr and Ba, significant negative Eu anomalies (δEu=0.41-1.01, average at 0.62), I_Sr=0.711 4-0.750 3 and ε_Nd(t)=-9.30 to -13.32. These data suggest that magma for the JCG was derived from partial melting of biotite-bearing metagreywacke in the upper continental crust, and that the melting conditions featuring high temperature but shallow depth level suggest existence of an extra heat source, implying that deep processes of subducted plate delamination, asthenospheric mantle upwelling, mafic magma intrusion and underplating might occurred at southern margin of the Qaidam block in the late caledonian. The JCG pluton has Nd model age (T_DM2) of 1.9-2.2 Ga and initial Pb isotope ratios ²⁰⁶Pb/²⁰⁴Pb of 18.181-18.389, ²⁰⁷Pb/²⁰⁴Pb values of 15.582-15.632 and ²⁰⁸Pb/²⁰⁴Pb values of 37.914-38.243, suggesting that the basement of the Qaidam block is geochemically akin to that of the Yangtze block.
- cordierite granite /
- Nd-Sr-Pb isotopes /
- petrogenesis /
- tectonic affinity of source region and tectonic evolution /
- Qaidam block /
- geochemistry /
- petrology

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图 1 地质背景及样品位置(据刘永成和叶永福，1998；张建新等，2003修改)

Fig. 1. Geological setting and sample location

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图 2 A/NK-A/CNK图解(据Shand, 1927; Maniar and Piccoli, 1989)

注：以下各图图例同上

Fig. 2. Relations of A/NK vs. A/CNK

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图 3 (Na₂O+K₂O)-SiO₂图解(a)和K₂O-SiO₂图解(b)(图 3a据Rickwood, 1989；图 3b据Rickwood, 1989)

Fig. 3. Relations of (Na₂O+K₂O) vs. SiO₂ (a) and K₂O vs. SiO₂ (b)

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图 4 金水口堇青石花岗岩球粒陨石标准化的稀土元素(a)和微量元素(b)组成模式(a.球粒陨石标准化值据Sun and McDonough, 1989; b.原始地幔数值据Sun and McDonough, 1989)

Fig. 4. Chondrite normalized REE patterns (a) and primative mantle normalized trace elements spider diagram (b) of Jinshuikou cordierite granite

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图 5 CaO/Na₂O-Al₂O₃/TiO₂图解(a)和(TFeO+MgO+TiO₂)-SiO₂图解(b)

a据Sylvester(1998)略修改，其中拉克伦造山带数据为Sylvester(1998)转引数据；b据Sylvester(1998)略修改

Fig. 5. Relations of CaO/Na₂O vs. Al₂O₃/TiO₂ (a) and (TFeO+MgO+TiO₂) vs. SiO₂ (b)

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图 6 ε_Nd(0)-ε_Sr(0)关系图解(据Depaolo and Wasserburg, 1979略修改)

Fig. 6. Relations of ε_Nd(0) vs. ε_Sr(0)

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图 7 Rb/Ba-Rb/Sr图解(a)和CaO/(TFe₂O₃+MgO+TiO₂)-(CaO+TFe₂O₃+MgO+TiO₂)图解(b)

a据Sylvester(1998)；b据Patiño Douce(1999)略修改；HP.实线代表高压条件下泥质岩熔体和玄武质岩浆混合的演化线；LP.实线代表低压条件下泥质岩熔体和玄武质岩浆混合的演化线；R.断线代表泥质岩中熔体-残余体混合线；R₁.虚线代表金水口堇青石花岗岩的熔体-残余体混合线

Fig. 7. Relations of Rb/Ba vs. Rb/Sr (a) and CaO/(TFe₂O₃+MgO+TiO₂) vs. CaO+TFe₂O₃+MgO+TiO₂ (b)

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图 8 ²⁰⁷Pb/²⁰⁴Pb-²⁰⁶Pb/²⁰⁴Pb和²⁰⁸Pb/²⁰⁴Pb-²⁰⁶Pb/²⁰⁴Pb图解

图中分区据张本仁等(2002); SNC.华北陆块南缘花岗岩和斑岩长石; NYCE.扬子陆块北缘东段中生代花岗岩长石; NQ1.北秦岭新元古代和早古生代花岗岩类长石; NQ2.北秦岭印支期和燕山期花岗岩类长石; SQE1.南秦岭东段新元古代和早古生代花岗岩类长石; SQE2.南秦岭东段印支期花岗岩类长石; SQW.南秦岭西段中生代花岗岩类长石

Fig. 8. 8Relations of ²⁰⁷Pb/²⁰⁴Pb-²⁰⁶Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb-²⁰⁶Pb/²⁰⁴Pb

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表 1 金水口堇青石花岗岩主量元素(%)和微量元素(μg/g)成分

Table 1. Major and trace elements composition of Jinshuikou cordierite granite

样品编号	03JSK-3	03JSK-4	03JSK-5	03JSK-6	03JSK-7	03JSK-16	03JSK-17	NJ01001^*	NJ01003^*	NJ01008^*
SiO₂	74.31	76.47	78.00	74.02	74.44	75.76	72.40	73.42	77.89	73.19
TiO₂	0.31	0.41	0.39	0.50	0.48	0.53	0.59	0.40	0.55	0.41
Al₂O₃	12.98	11.43	10.04	12.03	12.47	11.68	13.62	13.24	11.15	12.56
TFeO	2.73	3.38	3.22	4.06	3.19	3.95	4.27	2.85	3.40	4.09
TFe₂O₃	3.03	3.76	3.58	4.51	3.54	4.39	4.75	3.17	3.78	4.55
MnO	0.06	0.09	0.08	0.12	0.09	0.12	0.12	0.05	0.06	0.05
MgO	1.01	1.04	1.14	1.25	1.00	1.18	1.15	1.23	1.21	2.30
CaO	1.60	1.45	0.96	1.44	1.68	0.88	0.66	1.41	2.42	0.59
Na₂O	2.23	1.71	1.38	1.84	2.05	1.32	1.36	2.29	2.62	1.11
K₂O	3.22	2.56	2.91	2.96	3.33	3.54	4.06	3.26	1.16	3.03
P₂O₅	0.06	0.05	0.04	0.05	0.05	0.05	0.06	0.02	0.02	0.01
A/CNK	1.29	1.39	1.40	1.36	1.24	1.54	1.74	1.35	1.12	2.05
C	3.08	3.35	3.00	3.33	2.56	4.21	6.01	3.46	1.21	6.54
CaO/Na₂O	0.72	0.85	0.70	0.78	0.82	0.67	0.49	0.62	0.92	0.53
Al₂O₃/TiO₂	41.87	27.88	25.74	24.06	25.98	22.04	23.08	33.10	20.27	30.63
La	38.12	40.68	33.61	40.73	40.14	44.32	44.99	25.56	39.70	31.43
Ce	75.07	81.00	69.58	82.43	80.07	88.12	90.21	48.83	77.73	65.19
Pr	8.72	9.18	8.05	9.43	8.81	10.26	10.49	5.34	8.60	7.47
Nd	31.41	32.56	29.43	34.04	32.64	36.48	38.01	19.54	30.56	27.90
Sm	5.42	5.89	5.12	6.31	5.40	6.47	7.10	3.37	5.08	4.80
Eu	1.24	1.09	1.00	1.10	1.38	1.07	1.09	1.06	1.05	0.62
Gd	4.62	6.51	4.70	6.97	5.16	7.29	8.04	2.96	4.69	4.47
Tb	0.66	1.07	0.82	1.21	0.87	1.16	1.37	0.43	0.68	0.68
Dy	3.72	6.45	5.70	7.82	6.03	7.22	9.11	2.36	3.76	4.11
Ho	0.71	1.36	1.29	1.80	1.27	1.47	2.11	0.45	0.67	0.80
Er	1.98	4.13	4.30	5.88	3.98	4.19	6.21	1.19	1.62	1.99
Tm	0.28	0.60	0.68	0.96	0.59	0.58	0.89	0.20	0.24	0.30
Yb	1.83	4.12	4.71	6.85	3.82	3.71	5.46	1.33	1.45	1.72
Lu	0.28	0.60	0.76	1.07	0.58	0.53	0.76	0.22	0.23	0.26
ΣREE	174.06	195.24	169.76	206.60	190.74	212.87	225.82	112.84	176.06	151.74
δEu	0.74	0.54	0.61	0.51	0.79	0.47	0.44	1.01	0.65	0.41
(La/Yb)_N	14.93	7.09	5.11	4.27	7.54	8.57	5.91	3.35	4.74	3.18
Ba	533.24	673.09	740.74	707.16	614.18	810.77	755.17	880.40	93.16	521.50
Rb	104.54	76.87	90.68	98.92	92.12	98.19	142.26	118.80	91.42	124.00
Th	13.04	13.91	15.51	15.17	11.81	16.23	19.04	7.40	11.25	12.47
U	1.58	1.88	1.28	1.51	1.28	1.44	2.78	1.75	1.85	1.88
Nb	8.90	7.33	7.43	9.39	9.39	9.37	12.47	8.46	12.72	7.89
Ta	0.70	0.57	0.63	0.71	0.68	0.64	0.91	0.60	1.01	0.52
Sr	243.48	173.83	208.09	226.26	176.71	136.71	121.68	202.90	215.30	100.60
Zr	166.27	246.81	211.30	240.03	177.40	223.67	218.31	181.70	203.30	178.60
Hf	4.76	6.60	5.93	6.31	5.07	6.16	5.98	5.32	5.92	5.17
Ga	16.82	13.71	10.94	14.43	13.90	14.52	15.75	15.79	15.49	16.95
Ni	13.92	11.60	10.79	10.61	13.91	5.60	6.80	10.32	17.01	21.73
Cr	28.40	34.92	42.20	46.66	37.50	37.83	50.59	20.23	37.95	27.71
Co	6.46	7.64	7.48	10.14	8.67	8.19	8.97	6.95	8.27	9.56
Y	24.61	37.17	62.82	47.95	45.07	38.78	57.07	13.43	19.61	23.59
Rb/Ba	0.20	0.11	0.12	0.14	0.15	0.12	0.19	0.13	0.98	0.24
Rb/Sr	0.43	0.44	0.44	0.44	0.52	0.72	1.17	0.59	0.42	1.23
Nb/Ta	12.71	12.92	11.88	13.19	13.71	14.69	13.71	14.05	12.64	15.30
注：^*为余能等(2005)测定的金水口堇青石花岗岩的数据；表中A/CNK=Al₂O₃/(CaO+Na₂O+K₂O)摩尔数分数比；C为刚玉分子；TFeO=0.899 81×Fe₂O₃+FeO；TFe₂O₃=1.111 34×FeO+Fe₂O₃.

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表 2 金水口堇青石花岗岩的Sr-Nd同位素成分

Table 2. Sr and Nd isotopic compositions of Jinshuikou cordierite granite

样品编号	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	±2 σ	I_Sr	ε_Sr(0)	ε_Sr(t)	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	±2 σ	ε_Nd(0)	ε_Nd(t)	T_DM1(Ga)	T_DM2(Ga)
03JSK-3	1.245	0.749 020	15	0.742 320	631.94	543.49	0.112	0.511 796	11	-16.42	-12.35	2.0	2.1
03JSK-5	1.263	0.751 237	15	0.744 438	663.41	573.60	0.114	0.511 810	11	-16.15	-12.17	2.0	2.1
03JSK-6	1.267	0.749 367	16	0.742 546	636.86	546.73	0.112	0.511 746	11	-17.40	-13.32	2.1	2.2
03JSK-7	1.511	0.756 250	17	0.748 117	734.56	625.84	0.112	0.511 934	12	-13.73	-9.65	1.8	1.9
03JSK-18	1.074	0.754 576	14	0.748 794	710.80	635.47	0.118	0.511 885	11	-14.69	-10.90	2.0	2.0
NJ01001^*	1.698	0.720 533	17	0.711 394	227.58	104.24	0.104	0.511 789	11	-16.56	-12.10	1.9	2.1
NJ01003^*	1.231	0.756 953	14	0.750 326	744.54	657.23	0.100	0.511 735	9	-17.61	-12.96	1.9	2.2
NJ01008^*	3.575	0.742 014	14	0.722 775	532.49	265.86	0.104	0.511 932	8	-13.77	-9.30	1.7	1.9
注：^*为余能等(2005)测定的金水口堇青石花岗岩的数据；表中以t=378 Ma，对所有样品进行I_Sr、ε_Sr(t)和ε_Nd(t)的计算.

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表 3 金水口堇青石花岗岩的全岩Pb同位素成分

Table 3. Pb isotopic compositions from the whole rock of Jinshuikou cordierite granite

样品编号	²⁰⁶Pb/²⁰⁴Pb	²⁰⁷Pb/²⁰⁴Pb	²⁰⁸Pb/²⁰⁴Pb	(²⁰⁶Pb/²⁰⁴Pb) t	(²⁰⁷Pb/²⁰⁴Pb) t	(²⁰⁸Pb/²⁰⁴Pb) t
03JSK-3	18.637	15.645	38.887	18.389	15.632	38.243
03JSK-5	18.495	15.601	38.832	18.290	15.590	38.050
03JSK-6	18.395	15.611	38.753	18.204	15.601	38.147
03JSK-7	18.512	15.612	38.643	18.262	15.598	37.914
03JSK-18	18.299	15.588	38.219	18.181	15.582	38.093
注：表中以t=378 Ma，对所有样品进行初始Pb同位素比值计算.

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