新疆西天山查汗查哈花岗岩锆石U-Pb定年、岩石地球化学特征及其大地构造意义

刘高峰; 王斌; 陈士海; 艾海平

doi:10.12090/j.issn.1006-6616.2018.24.04.056

新疆西天山查汗查哈花岗岩锆石U-Pb定年、岩石地球化学特征及其大地构造意义

doi: 10.12090/j.issn.1006-6616.2018.24.04.056

刘高峰^{1, 2,},
王斌^{1, 2},
陈士海²,
艾海平²

1.
南京大学地球科学与工程学院, 江苏南京 210093
2.
江西省地质调查研究院, 江西南昌 330030

基金项目:

新疆国土资源厅基金项目 T14-1-LQ07

详细信息

作者简介:
刘高峰(1986-), 男, 在读硕士, 工程师, 从事区域地质矿产工作。E-mail:oasiskobe@163.com

中图分类号: P588.121;P597.3
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-13
- 修回日期: 2018-05-22
- 刊出日期: 2018-08-01

ZIRCON U-PB DATING AND GEOCHEMICAL FEATURES OF CHAHANCHAHA GRANITE FROM WESTERN TIANSHAN, XINJIANG: IMPLICATIONS FOR TECTONIC EVOLUTION

LIU Gaofeng^{1, 2
,},
WANG Bin^{1, 2},
CHEN Shihai²,
AI Haiping²

1.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China
2.
Geological Survery of Jiangxi province, Nanchang 330030, Jiangxi, China

摘要

摘要: 查汗查哈岩体出露于新疆西天山东南段，位于中天山南缘断裂北缘的那拉提-中天山侵入岩带，岩性主要为片麻状花岗闪长岩和二长花岗岩。锆石U-Pb定年结果显示，查汗查哈岩体花岗质岩石形成于421.9±6.2 Ma。岩石地球化学特征表明其属于准铝质钙碱性Ⅰ型花岗岩，并具有较典型的大陆边缘弧侵入岩的特征。这一研究结果显示，南天山洋在晚志留世已经开始向北俯冲，并在中天山南缘形成大陆边缘弧环境。
- 天山 /
- 花岗岩 /
- 锆石U-Pb年龄 /
- 志留纪
Abstract: The Chahanchaha granitic body outcrops in the southeast part of the western Tianshan Mountains, Xinjiang, and it is located in the Nalati-Central Tianshan intrusive rock belt at the northern edge of the fault, south margin of the Central Tianshan. The rock type is dominated by granodiorite and monzonitic granite with weak gneissic foliation. The zircon U-Pb dating results indicate that the Chahanchaha granitic rocks formed at 421±6.2 Ma. The geochemical characteristics suggest that the granitic rocks are grouped in metaluminouscalc-alkaline Ⅰ-type granite, which exhibits typical characteristics of intrusive rocks in the continental arc. These data demonstrate that the paleo-south Tianshan ocean crust has started northward subduction at late Silurian, resulting in a continental arc upon the overriding plate.
- Tianshan Mountains /
- granite /
- zircon U-Pb age /
- Silurian

HTML全文

图 1 西天山东南段岩浆岩分布图(据文献[5]修改)

1—石炭—二叠纪侵入岩；2—泥盆纪侵入岩；3—志留纪侵入岩；4—中酸性火山岩分布区；5—中基性火山岩分布区；6—基性火山岩分布区；7—石炭—二叠系地层分布区；8—志留—石炭系地层分布区；9—泥盆—石炭系；10—断层；11—年龄样；12—全岩分析样

Figure 1. Spatial distribution of magmatic rocks in the southwest segment of western Tianshan Mountians (modified after [5])

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图 2 岩石显微照片

a—花岗闪长岩；b—二长花岗岩；c—似斑状二长花岗岩Q—quartz; Pl—plagioclase; Bt—biotite

Figure 2. Rock micrographs

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图 3 花岗闪长岩(PM02-44)锆石阴极放发光图像

Figure 3. Cathodeluminescence(CL) images for zircons from granodiorite(PM02-44)

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图 4 花岗闪长岩(PM02-44)锆石U-Pb同位素年龄谐和图

Figure 4. Zircon U-Pb concordia diagrams from granodiorite(PM02-44)

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图 5 SiO₂—K₂O图解及A/CNK—A/NK图解^[17]~^[18]

▲花岗闪长岩；■二长花岗岩；●似斑状二长花岗岩

Figure 5. SiO₂ VS K₂O diagram and A/CNK VS A/NK diagram^[17]~^[18]

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图 6 稀土及微量元素标准化曲线图^[17~18]

a—稀土元素球粒陨石标准化曲线图；b—微量元素原始地幔标准化曲线图
▲花岗闪长岩；■二长花岗岩；●似斑状二长花岗岩

Figure 6. Chondrite-normalized REE patterns diagram and primitive mantle-normalized trace element patterns diagram^[17~18]

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图 7 (K₂O+Na₂O)/CaO及(Ce+Zr+Y+Nb)图解^[23]

▲花岗闪长岩；■二长花岗岩；●似斑状二长花岗岩

Figure 7. (K₂O+Na₂O)/CaO VS (Ce+Zr+Y+Nb) diagram^[23]

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图 8 C/MF-A/MF图解

▲花岗闪长岩；■二长花岗岩；●似斑状二长花岗岩

Figure 8. C/MF-A/MF diagram

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图 9 元素构造环境判别图解

Figure 9. Element diagrams to discriminate tectonic settings

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表 1 锆石U-Pb测年结果表

Table 1. Zircons U-Pb dating results

PM02-44 测点号	位置	元素含量/×10^-6和比值				同位素比值				年龄/Ma					谐和度
PM02-44 测点号	位置	Pb	Th	U	Th/U	²⁰⁷Pb/²³⁵U	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁶Pb/²³⁸U	rho	²⁰⁷Pb/²³⁵U	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁶Pb/²³⁸U	谐和度
15	核部	17.0	172	166	1.04	0.5689	0.0291	0.0700	0.0009	0.2493	457.3	18.8	436.1	5.4	95%
14	核部	26.8	208	297	0.70	0.5433	0.0168	0.0696	0.0007	0.3317	440.6	11.1	433.5	4.3	98%
17	幔部	16.1	119	183	0.65	0.5610	0.0214	0.0691	0.0009	0.3443	452.2	13.9	431.0	5.5	95%
4	幔部	68.5	223	868	0.26	0.5408	0.0124	0.0689	0.0006	0.3690	438.9	8.2	429.4	3.5	97%
7	幔部	33.7	168	422	0.40	0.5482	0.0179	0.0686	0.0009	0.3944	443.8	11.7	427.6	5.3	96%
6	幔部	15.3	109	174	0.63	0.5049	0.0220	0.0685	0.0008	0.2804	415.0	14.8	427.0	5.1	97%
13	核部	14.0	101	163	0.62	0.5066	0.0240	0.0679	0.0008	0.2583	416.2	16.2	423.7	5.0	98%
8	核部	16.5	190	176	1.08	0.5138	0.0217	0.0670	0.0008	0.2968	421.0	14.6	417.9	5.1	99%
10	核部	18.0	179	197	0.91	0.4980	0.0211	0.0669	0.0007	0.2613	410.4	14.3	417.3	4.5	98%
3	核部	13.5	118	152	0.77	0.5315	0.0222	0.0668	0.0008	0.2881	432.8	14.7	416.9	4.9	96%
9	核部	11.4	118	123	0.97	0.5420	0.0276	0.0668	0.0010	0.3002	439.8	18.2	416.6	6.2	94%
12	核部	18.5	151	212	0.71	0.5549	0.0175	0.0667	0.0008	0.3655	448.2	11.4	416.2	4.6	92%
1	核部	9.7	83.2	115	0.73	0.5167	0.0291	0.0665	0.0010	0.2648	423.0	19.5	415.0	6.0	98%
11	核部	10.6	96	121	0.79	0.5081	0.0255	0.0654	0.0008	0.2523	417.1	17.1	408.4	5.0	97%
5	核部	100	351	1327	0.26	0.5125	0.0106	0.0650	0.0005	0.3820	420.1	7.2	406.0	3.1	96%

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表 2 岩体主量(%)、微量(×10^-6)及稀土(×10^-6)元素化学成分表

Table 2. Major (%), trace elements (×10^-6) and rare earth (×10^-6) elements compositions of the granite body

样品号		PM01-21	PM01-55	D0200	D1180	D1247	D3730	2-44	D1540A	2-30	D7777	PM20-1	BD3506	BD3507-1	PM20-10
岩性		花岗闪长岩							二长花岗岩				似斑状二长花岗岩
主量元素含量	SiO₂	60.36	65.7	65.08	58.52	58.52	58.45	64.12	64.69	69.86	63.3	68.66	70.92	68.78	62.04
	TiO₂	0.73	0.4	0.49	0.88	0.88	0.83	0.97	0.6	0.32	0.39	0.21	0.22	0.28	0.66
	Al₂O₃	15.52	16.87	13.43	15.51	13.56	15.25	14.84	13.85	13.72	14.46	15.27	13.33	14.28	14.19
	Fe₂O₃	0.9	1.7	1.58	1.5	2.37	3.46	0.5	1.78	0.4	1.46	0.5	0.65	0.6	2.38
	FeO	5.13	2.43	3.42	5.85	6.01	4.59	4.86	3.8	3.06	2.11	2.16	2.11	2.34	4.23
	MnO	0.09	0.06	0.091	0.17	0.148	0.145	0.08	0.092	0.06	0.083	0.034	0.04	0.03	0.123
	MgO	3.12	1.29	2.03	2.93	4.1	3.27	2.34	2.5	0.63	1.11	0.83	0.37	0.82	2.67
	CaO	5.5	4.35	3.74	4.59	6.18	6.35	3.54	4.43	1.55	6.39	2.88	1.52	2.52	5.07
	Na₂O	3.47	4.02	2.92	3.79	2.25	2.63	3.31	2.4	3.84	4.32	6.88	3.27	2.82	2.62
	K₂O	1.84	1.5	4.02	1.73	3.7	2.23	2.76	3.9	3.73	1.72	0.71	4.51	4.47	2.45
	P₂O₅	0.19	0.16	0.19	0.26	0.3	0.22	0.26	0.22	0.21	0.16	0.15	0.1	0.15	0.17
	LOI	1.25	0.93	1.38	3.13	0.6	1.85	0.93	0.81	0.77	3.57	1.26	0.79	0.29	2.38
	总量	98.21	99.5	98.39	98.86	98.61	99.25	98.51	99.07	98.17	99.06	99.53	97.83	97.39	98.97
	A/CNK	0.88	1.04	0.84	0.94	0.71	0.83	1.00	0.85	1.04	0.70	0.88	1.02	1.01	0.88
	A/NK	2.01	2.05	1.47	1.91	1.76	2.26	1.76	1.69	1.32	1.61	1.26	1.30	1.50	2.04
	Na₂O+K₂O	5.31	5.53	6.94	5.52	5.95	4.85	6.08	6.3	7.58	6.03	7.58	7.78	7.28	5.07
	Na₂O/K₂O	1.89	2.68	0.73	2.19	0.61	1.18	1.2	0.62	1.03	2.52	9.71	0.73	0.63	1.07
	TFeO	5.94	3.96	4.84	7.2	8.13	7.7	5.31	5.4	3.42	3.42	2.61	2.7	2.88	6.37
微量元素含量	Rb	76	43	152	104	126	113	112	162	170	67	35	179	144	94
	Sr	480.80	530.30	305.30	314.60	320.60	334.10	299.50	292.90	153.80	509.00	546.30	176.50	384.10	267.00
	Ba	502	530	1769	472	1234	502	731	1093	518	795	270	596	1757	663
	Th	7.24	6.21	21.14	6.95	3.99	11.7	13.81	22.9	15.2	4.92	2.15	14.97	21.7	15.7
	U	1.13	0.58	1.5	2.05	2.26	3.56	1.73	2.83	2.96	0.81	0.91	3.05	1.97	4.36
	Nb	8.69	5.04	11.07	9.02	12.46	9.68	13.28	13.15	12.95	6.26	3.46	9.32	7.03	9.5
	Ta	0.54	0.3	0.76	0.97	0.96	0.78	0.99	1.14	1.55	0.39	0.4	1.08	0.79	1.1
	Zr	72	95	157	162	195	155	242	186	181	140	98	167	228	150
	Hf	1.81	2.5	4.36	4.14	5.41	4.2	6.87	5.22	5.51	3.83	2.82	5.05	6.92	4.26
	P	931	717	847	1115	1304	953	1136	977	928	700	641	432	683	741
	Cr	54.54	14.24	100.1	63.13	108.6	88.05	45.28	80.46	14.89	26.77	44.44	30.74	15.05	95.69
	Co	15.07	6.13	12.06	15.45	22.58	19.84	12.27	13.93	2.93	5.44	5.05	2.76	4.69	17.2
	Ni	25.18	4.86	22.73	44.84	24.43	32.22	22.75	18.69	5.94	9.21	19.85	12.41	5.77	21.9
	Ga	19.73	18.66	17.84	21.41	20.65	21.91	20.47	18.51	19.53	18.38	18.79	16.66	15.81	17.88
	Rb/Sr	0.16	0.08	0.5	0.33	0.39	0.34	0.38	0.55	1.1	0.13	0.06	1.01	0.37	0.35
	U/Th	0.16	0.09	0.07	0.29	0.57	0.3	0.12	0.12	0.19	0.16	0.42	0.2	0.09	0.28
	Zr/Hf	39.86	38.12	35.94	39.22	36.09	36.87	35.28	35.69	32.74	36.41	34.92	33.03	32.88	35.15
	Ba/Sr	1.04	1	5.79	1.5	3.85	1.5	2.44	3.73	3.37	1.56	0.49	3.38	4.57	2.48
	Rb/Ba	0.15	0.08	0.09	0.22	0.1	0.23	0.15	0.15	0.33	0.08	0.13	0.3	0.08	0.14
稀土元素含量	La	24.42	30.51	20.8	21.09	25.37	31.33	49.89	40.85	34.87	23.64	5.23	31.17	57.49	32.39
	Ce	48.87	48.97	35.08	51.07	72.49	61.3	97.29	83.98	67.23	39.89	8.62	58.88	99.52	54.49
	Pr	5.84	6.01	4.05	5.59	10.46	7.32	11.56	9.69	7.86	4.49	1.18	6.75	10.29	6.44
	Nd	22.63	21.58	15.49	22.92	44.57	28.21	42.77	36.22	28.53	16.42	5.12	24.06	32.26	24.33
	Sm	4.54	3.15	2.75	4.97	8.98	5.53	7.57	6.4	5.66	2.58	1.25	4.5	4.15	4.65
	Eu	1.01	1.1	0.93	1.23	1.95	1.41	1.65	1.5	0.91	1.04	0.57	0.89	1.03	1.28
	Gd	3.89	2.68	2.53	4.35	7.07	4.71	6.74	5.34	5.21	2.27	1.05	3.86	3.61	4.06
	Tb	0.57	0.35	0.45	0.76	1.12	0.77	0.99	0.8	0.83	0.31	0.18	0.54	0.38	0.66
	Dy	2.99	1.69	3.23	4.42	6.11	4.34	5.33	4.28	4.51	1.59	1.02	2.5	1.56	3.88
	Ho	0.56	0.32	0.78	0.84	1.17	0.83	0.99	0.82	0.78	0.3	0.2	0.42	0.27	0.77
	Er	1.53	0.91	2.58	2.35	3.34	2.37	2.79	2.39	2.16	0.89	0.58	1.18	0.83	2.21
	Tm	0.22	0.13	0.43	0.33	0.48	0.35	0.38	0.35	0.29	0.12	0.09	0.17	0.1	0.33
	Yb	1.41	0.8	2.89	2.15	3.08	2.27	2.29	2.33	1.79	0.79	0.57	1.08	0.68	2.24
	Lu	0.22	0.12	0.48	0.32	0.47	0.35	0.35	0.36	0.28	0.12	0.09	0.17	0.12	0.35
	Y	15.97	9.29	21.97	24.46	34.29	24.43	24.99	24.18	22.19	9.28	5.99	11.19	7.14	22.73
	ΣREE	118.7	118.3	92.46	122.4	186.7	151.1	230.6	195.3	160.9	94.48	25.74	136.2	212.3	138.1
	LREE/HREE	9.43	15.9	5.92	6.88	7.18	8.45	10.62	10.71	9.15	13.74	5.82	12.73	27.12	8.53
	La_N/YbN	12.45	27.39	5.16	7.03	5.92	9.91	15.65	12.59	13.94	21.36	6.53	20.72	60.29	10.38
	δEu	0.72	1.13	1.06	0.79	0.72	0.82	0.69	0.76	0.51	1.28	1.48	0.64	0.79	0.88
	δCe	0.97	0.83	0.88	1.13	1.09	0.96	0.96	1	0.96	0.89	0.82	0.95	0.93	0.87

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表 3 岩体标准矿物含量及特征参数表

Table 3. Standard mineral contents and characteristic parameters of the granite body

样品号		PM01-21	PM01-55	D0200	D1180	D1247	D3730	2-44	D1540A	2-30	D7777	PM20-1	BD3506	BD3507-1	PM20-10
岩性		花岗闪长岩							二长花岗岩				似斑状二长花岗岩
(CIPW) 标准矿物含量 /%	Q	15.24	24.8	22.1	13.3	12.15	15.85	21.23	22.56	28.05	19.91	18.79	30.65	28.39	22.47
	An	22.05	20.88	12.01	21.08	16.28	23.87	16.25	15.78	6.5	15.72	8.86	7.07	11.86	20.4
	Ab	30.33	34.56	25.49	33.52	19.47	22.85	28.74	20.68	33.39	38.26	59.21	28.52	24.53	22.97
	Or	11.2	9.02	24.51	10.69	22.28	13.52	16.73	23.44	22.65	10.62	4.26	27.45	27.18	14.98
	C	0	1.11	0	0	0	0	0.6	0	1.06	0	0	0.57	0.61	0
	Di	4.03	0	4.8	0.82	10.69	5.75	0	4.18	0	11.01	3.95	0	0	3.66
	Hy	13.93	6.22	7.31	15.96	13.22	11.95	13.21	9.05	6.63	0	3.45	4.08	5.61	10.29
	Wo	0	0	0	0	0	0	0	0	0	1.25	0	0	0	0
	Il	1.42	0.76	0.97	1.75	1.71	1.61	1.88	1.16	0.62	0.77	0.4	0.44	0.55	1.29
	Mt	1.35	2.27	2.36	2.27	3.5	4.1	0.74	2.62	0.59	2.07	0.74	0.98	0.9	3.53
	Ap	0.45	0.37	0.46	0.62	0.71	0.52	0.62	0.53	0.5	0.39	0.35	0.24	0.37	0.41
	DI	56.77	68.38	72.1	57.51	53.9	52.22	66.7	66.68	84.09	68.79	82.26	86.62	80.1	60.42
	SI	21.61	11.8	14.53	18.55	22.25	20.29	17	17.36	5.42	10.4	7.49	3.4	7.46	18.63
	AR	1.68	1.7	2.03	1.76	1.59	1.58	1.99	1.71	2.97	1.81	2.44	2.58	2.01	1.72
	σ43	1.55	1.33	2.13	1.84	2.21	1.46	1.71	1.8	2.11	1.71	2.22	2.14	2.02	1.3
	A/MF	0.95	1.9	1.12	0.88	0.62	0.79	1.1	0.99	2.13	1.89	2.63	2.79	2.31	0.9
	C/MF	0.61	0.89	0.57	0.47	0.51	0.6	0.48	0.58	0.44	1.51	0.9	0.58	0.74	0.58

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