甘肃北山中泥盆世哈尔特尔德勒花岗岩体的地球化学特征及其构造意义

计波; 余吉远; 郭琳; 过磊; 卜涛

甘肃北山中泥盆世哈尔特尔德勒花岗岩体的地球化学特征及其构造意义

计波^{1, 2,},
余吉远^{1, 2},
郭琳^{1, 2},
过磊^{1, 2},
卜涛^{1, 2}

1.
中国地质调查局造山带地质研究中心, 中国地质调查局西安地质调查中心, 西安 710054
2.
国土资源部岩浆作用成矿与找矿重点实验室, 中国地质调查局西安地质调查中心, 西安 710054

基金项目:

中国地质大调查项目 12120113046400

详细信息

作者简介:
计波(1986-), 男, 工程师, 从事区域地质调查、沉积学、岩石地球化学研究。E-mail:46880421@qq.com

中图分类号: P595;P588.121
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- 被引次数: 0
出版历程
- 收稿日期: 2016-11-08
- 刊出日期: 2017-06-01

GEOCHEMISTRY CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF THE HAERTEERDELE GRANITE MASS IN MIDDLE DEVONIAN IN BEISHAN, GANSU

JI Bo^{1, 2
,},
YU Ji-yuan^{1, 2},
GUO Lin^{1, 2},
GUO Lei^{1, 2},
BU Tao^{1, 2}

1.
Research Center for Orogenic Geology, Xi'an Center of Geological Survey, Geological Survey of China, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources, Xi'an Center of Geological Survey, Geological Survey of China, Xi'an 710054, China

摘要

摘要: 牛圈子哈尔特尔德勒岩体具有高硅（Si>72.2%）、高碱（AR=2.9~5.1，K2O=3.86%~5.49%，Na2O=3.04%~3.83%）和高FeOT/MgO值（3.29~13.47）、低Al₂O₃（11.48%~13.42%）、贫CaO（0.57%~2.27%）和MgO（0.14%~0.78%）、低FeO_T（1.33%~2.34%）的特征，A/NK值为1.43~1.77，A/CNK值为1.35~1.4，为过铝质高钾钙碱性花岗岩。ΣREE较高，LREE略富集（（La/Yb）N=4.9~16），轻重稀土元素分馏不明显，Eu负异常明显（δEu=0.12~0.21）；相对富集Rb、K、Pb等大离子亲石元素，强烈亏损Ba、Sr、P、Ti，Eu，并弱亏损Ta、Nb等元素；同时具有与地壳更为接近的Nb/Ta与Nd/Th值，显示了A（A2）型花岗岩的特征。LA-ICP-MS锆石定年获得哈尔特尔德勒岩体的²⁰⁶Pb/²³⁸U年龄为371.7±2.9 Ma，代表该岩体的形成年龄，表明其为中泥盆世岩浆活动的产物。结合区域构造演化以及与区域同时代A型花岗岩的对比显示，该岩体形成于后碰撞伸展环境。
- 哈尔特尔德勒花岗岩体 /
- A型花岗岩 /
- 锆石定年 /
- 后碰撞构造 /
- 中泥盆世
Abstract: The Haerteerdele granite mass in Niuquanzi shows a high content of Si (>72.2%), alkaline(AR=2.9~5.1, K2O=3.86%~5.49%, Na2O=3.04%~3.83%)and FeOT/Mg(3.29~13.47), and a low content of Al₂O₃(11.48%~13.42%), CaO(0.57%~2.27%), MgO(0.14%~0.78%) and FeOT(1.33%~2.34%).It is determined that the granites are peraluminous granitoids of the calc-alkaline suite (A/NK=1.43~1.77, A/CNK=1.35~1.4), with the characteristics that an enriched pattern with a high ΣREE content and a slight high LREE content ((La/Yb)N=4.9~16), unapparent fractionation of heavy and rare earth elements, obvious Eu negative abnormality(δEu=0.12~0.21), relatively large concentration of large ion lithophile elements such as Rb, K, Pb, strong depletion of the elements of Ba、Sr、P、Ti, Eu, and weak depletion of Ta, Nb and other elements. Also the granites have the similar value in Nb/Ta and Nd/Th with the earthcrust, showing the characteristic of typeA (A2) granite. The chronology result of LA-ICP-MS zircon dating shows the age of ²⁰⁶Pb/²³⁸U of the Haerteerdele granite mass is 371.7±2.9Ma, which represents the formation age of the granite mass and the formation period is the middle Devonian. Taking into consideration the regional tectonic evolution and the comparison with the contemporary type A granite, it shows that the granite mass is the product of postcollision to extension.
- Haerteerdele granite mass /
- typeA granite /
- zircon dating /
- post-collision structure /
- Middle Devonian

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图 1 甘肃北山哈尔特尔德勒岩体地质简图^[13]

Figure 1. Geological sketch map of the granite mass in Haerteerdele area, Beishan, Gansu Province

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图 2 哈尔特尔德勒花岗岩类型判别图^[15~16]

Figure 2. Discrimination diagrams of the Haerteerdele granite types

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图 3 哈尔特尔德勒花岗岩K₂O-SiO₂图解(a)^[17]和A/NK—A/CNK图解(b)^[18]

Figure 3. K₂O-SiO₂ diagram(a) and A/NK-A/CNK diagram (b) of the Haerteerdele granites

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图 4 哈尔特尔德勒花岗岩体稀土元素球粒陨石标准化分布模式图(a)和原始地幔标准化蛛网图(b)^[19]

Figure 4. Chondrite-normalized REE patterns (a) and primitive mantle normalized spidergram (b) of the Haerteerdele granite mass

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图 5 哈尔特尔德勒岩体锆石特征和LA-ICP-MS测点位置

Figure 5. Zircon characteristics and LA-ICP-MS measuring points of the Haerteerdele granite mass

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图 6 单颗粒锆石的谐和图及²⁰⁶Pb/²³⁸U加权平均年龄直方图

Figure 6. Concordia diagram and ²⁰⁶Pb/²³⁸U weighted average age histogram of single-grain zircon

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图 7 哈尔特尔德勒花岗岩按Sr-Yb分类图(a)^[42]和A型花岗岩亚类判别图(b和c)^[43]

Figure 7. Sr-Yb classification chart (a) and discrimination diagrams of the subdivision of the Haerteerdele A-type granite(b & c)

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图 8 哈尔特尔德勒花岗岩体构造环境判别图解^[45~46]

Figure 8. Tectonic environment discrimination diagrams of the Haerteerdele granite mass

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表 1 哈尔特尔德勒二长花岗岩主量元素及稀土、微量元素分析结果

Table 1. Analysis results of major elements, rare earth elements and trace elements of the Haerteerdele monzonitic granite

样品	YQ-3	YQ-21	YQ-32	YQ-6	YQ-9	YQ-23	YQ-41	YQ-1	YQ-15	YQ-26
SiO₂	78.0	74.59	76.15	76	76.28	75.66	77.0	75.6	74.98	72.2
Al₂O₃	11.5	13.31	12.38	12.34	12.19	12.33	12.1	12.5	12.58	13.42
Fe₂O₃	0.01	0.01	0.01	0.58	0.06	0.24	0.01	0.01	0.1	0.01
FeO	1.32	1.74	1.96	1.02	1.45	1.6	1.33	2.33	1.82	2.3
CaO	0.74	0.57	0.8	0.67	0.84	0.7	0.6	0.89	1.24	2.27
MgO	0.21	0.33	0.22	0.2	0.14	0.15	0.14	0.21	0.42	0.78
K₂O	4.37	5.49	4.92	4.86	4.59	5.32	5.05	4.84	4.52	3.86
Na₂O	3.2	3.83	3.14	3.35	3.5	3.04	3.07	3.35	3.25	3.72
TiO₂	0.12	0.17	0.16	0.14	0.13	0.15	0.12	0.14	0.22	0.24
P₂O₅	0.02	0.02	0.03	0.02	0.02	0.02	0.02	0.04	0.04	0.06
MnO	0.02	0.02	0.03	0.02	0.04	0.04	0.03	0.03	0.04	0.04
LOI	0.7	0.76	0.74	0.77	0.75	1.06	0.63	1.08	0.79	1.69
Pb	34.2	22	29.7	38.3	34	26.8	39.7	36.3	25.4	26.3
Cr	6.49	9.46	15.2	8.5	4.31	11.6	2.16	4.24	7.71	9.14
Ni	1.87	3.49	6.21	4.77	1.55	2.42	0.83	1.94	3.14	5.38
Co	1.08	2.72	1.29	2.16	0.87	1.94	0.62	1.1	2.66	3.2
Rb	273	164	251	214	339	182	191	222	199	209
Cs	3.54	1.58	2.38	4.14	11	2.33	1.74	4.02	2.22	4.64
Sr	41.4	77.4	74.5	45.8	27.1	69.1	40.4	39.4	80.7	174
Ba	121	350	297	150	114	414	145	151	404	366
Sc	1.83	7.22	3.63	2.62	1.6	7.46	2.66	1.54	8.91	6.05
Nb	14.6	10.2	12.9	17.4	19.5	12.8	11.3	14.5	13.1	15.2
Ta	1.15	0.85	1.03	1.28	1.54	0.94	0.93	1.14	0.95	1.3
Zr	130	241	265	220	203	235	178	160	201	156
Hf	5.45	6.86	7.43	6.62	7.28	6.71	5.8	5.59	6.21	5.04
U	3.76	1.86	1.83	2.75	4.9	1.58	1.92	1.76	2.34	2.36
Th	45.3	18.8	25.5	25.6	29.7	19.5	18.2	25.9	20	21
La	49.9	82.1	103	73.8	53.3	112	42.7	54.1	58.8	46.4
Ce	110	175	195	150	120	209	83.4	117	132	97.5
Pr	12.7	20.2	20.9	18.4	13.7	22.5	9.54	13.7	15.8	12
Nd	48.8	78.2	78.2	69.8	53.6	85.7	34.3	53	64.3	47
Sm	10.5	14.8	15.8	14.4	12.2	15.2	8.33	11.5	15.5	11.4
Eu	0.4	0.64	0.74	0.56	0.41	0.82	0.53	0.48	0.72	0.62
Gd	9.9	11.8	14.9	12.9	12.3	13.2	6.98	10.9	16.6	11.8
Tb	1.7	1.78	2.41	2.14	2.07	2.04	1.09	1.8	2.75	2.08
Dy	9.98	9.08	13.5	11.4	12.6	10.8	5.89	10.4	15.6	12.5
Ho	1.96	1.66	2.58	2.28	2.51	2.12	1.18	2.02	2.98	2.52
Er	5.56	4.4	6.78	6.22	7.27	5.76	3.18	5.63	7.83	7.1
Tm	0.87	0.64	0.96	0.9	1.09	0.82	0.49	0.85	1.09	1.08
Yb	5.31	3.73	5.55	5.32	7.05	5.02	3.17	5.26	6.3	6.74
Lu	0.77	0.53	0.75	0.78	0.97	0.73	0.51	0.78	0.85	0.93
Y	57.3	37.8	69.4	60.2	74.3	54.4	27.7	55.1	85.3	74.7
LREE	232.3	370.94	413.64	326.96	253.21	445.22	178.8	249.78	287.12	214.92
HREE	36.05	33.62	47.43	41.94	45.86	40.49	22.49	37.64	54	44.75
δEu	0.12	0.14	0.15	0.12	0.1	0.17	0.21	0.13	0.14	0.16

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表 2 哈尔特尔德勒二长花岗岩(TW07) 锆石U-Pb同位素分析结果

Table 2. LA-ICP-MS U-Pb zircons dating results of Haerteerdele monzonitic granites (TW07)

Analysis	Th	U	Th/U	Pb207/Pb206		Pb207/U235		Pb206/U238		Pb208/Th232		Pb207/U235		Pb206/U238		Pb208/Th232
Analysis	Th	U	Th/U	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma
TW7-1	185.31	357.06	0.52	0.05393	0.00261	0.44243	0.01727	0.05949	0.00092	0.01816	0.00042	372	12.16	372.5	5.62	363.7	8.38
TW7-4	120.70	330.65	0.37	0.05399	0.00303	0.44027	0.0211	0.05913	0.00101	0.01947	0.00062	370.4	14.87	370.3	6.16	389.8	12.2
TW7-5	183.47	462.75	0.40	0.0539	0.00249	0.4371	0.01587	0.05881	0.00089	0.01904	0.00045	368.2	11.21	368.4	5.4	381.2	8.97
TW7-6	219.49	743.12	0.30	0.05385	0.00208	0.43574	0.01158	0.05867	0.0008	0.01985	0.0004	367.2	8.19	367.5	4.9	397.3	7.97
TW7-9	212.08	493.50	0.43	0.054	0.00233	0.44641	0.01452	0.05995	0.00087	0.01837	0.00039	374.8	10.19	375.3	5.31	367.9	7.74
TW7-10	255.38	619.72	0.41	0.05482	0.0024	0.4409	0.01468	0.05832	0.00086	0.01855	0.00041	370.9	10.34	365.4	5.22	371.4	8.05
TW7-20	354.68	1074.24	0.33	0.05414	0.00242	0.45062	0.01556	0.06037	0.0009	0.01959	0.00049	377.7	10.89	377.8	5.48	392.2	9.68
TW7-22	132.62	357.72	0.37	0.05462	0.00363	0.43867	0.02606	0.05825	0.00113	0.0197	0.00077	369.3	18.4	365	6.9	394.3	15.22
TW7-25	281.59	842.06	0.33	0.05411	0.0022	0.44406	0.01303	0.05953	0.00084	0.01909	0.0004	373.1	9.16	372.8	5.14	382.2	7.99
TW7-26	70.35	180.46	0.39	0.05413	0.00374	0.44357	0.02759	0.05944	0.00117	0.01646	0.00068	372.8	19.41	372.2	7.14	329.9	13.51
TW7-27	261.00	730.45	0.36	0.05416	0.00195	0.44916	0.01012	0.06016	0.0008	0.02093	0.00034	376.7	7.09	376.6	4.88	418.6	6.75
TW7-30	177.79	600.40	0.30	0.05378	0.00256	0.43647	0.01657	0.05886	0.00091	0.0192	0.00053	367.8	11.72	368.7	5.55	384.5	10.58
TW7-31	76.48	212.91	0.36	0.05403	0.00295	0.44391	0.02056	0.0596	0.00101	0.01977	0.0006	373	14.46	373.2	6.12	395.7	11.99
TW7-32	258.61	957.70	0.27	0.05418	0.00185	0.44755	0.00886	0.05992	0.00078	0.02023	0.00032	375.6	6.21	375.2	4.76	404.9	6.32

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