Zircon U-Pb Ages and Geochemical Characteristics Study of Syenitefrom Weishan REE Deposit, Western Shandong

doi:10.13209/j.0479-8023.2017.010

Abstract

Abstract:

In order to enhance the understanding of the stage of magmatism and the relationship between Weishan alkaline complex and REE mineralization, the zircon U-Pb age and geochemistry of Weishan alkaline complex are conducted. The geochemical result shows that syenite series has the same geochemical characteristics, proving that they are from the same resource, and the syenite belong to metaluminous and alkaline series. They have high ∑REE, and distinct fractionation between HREE and LREE, exhibiting depleted in HREE, Nb, Ta, Zr, but enriched in LREE, Rb, Ba, Sr, and have slight Eu abnormality, which is consistent with the characteristics of mantle-derived magmatic rocks. The element-geochemical features reflect that the magma comes from enriched mantle. LA-ICP-MS zircon U-Pb ages of the ore-bearing quartz syenite and the aegirine-augite syenite are separately 122.4±2.0 Ma (MSWD=5.2) and 130.1±1.4 Ma (MSWD=9), and the presence of 2536±6.1 Ma (MSWD=1.6) inherited zircon is also an evidence that crustal materials have been involved in the magmatism process. It is concluded that Weishan syenites had come into being in an extensional setting after the transformation of the tectonic regime in the NCC in the Mesozoic area, when a large-scale enriched mantle melted to cause the generation of alkaline magma and a massive upwelling of the mantle materials from the asthenosphere to form finally the REE deposit after the formation of the alkaline rock complex.

Key words: Luxi Block, Weishan REE deposit, syenite, zircon U-Pb age

摘要：

为了加深对微山稀土矿碱性杂岩体岩浆活动期次及与成矿关系的理解, 对微山稀土矿床碱性杂岩体进行岩相学、地球化学分析和锆石U-Pb年代学测定。结果表明, 微山稀土矿碱性杂岩体正长岩类地球化学特征相似, 具有同源性, 为偏铝质碱性岩。稀土总量高, 轻重稀土元素分馏明显, 呈轻稀土高度富集模式。微量元素组成具有幔源岩浆岩的特征, 富集Rb, Ba, Sr等大离子亲石元素, 亏损Nb, Ta, Zr等高场强元素, Eu异常不显著。利用LA-ICP-MS U-Pb年代学方法, 测得含矿石英正长岩、霓辉石英正长岩锆石U-Pb年龄分别为122.4±2.0 Ma (MSWD=5.2)和130.1±1.4 Ma (MSWD=9), 存在2536±6.1 Ma (MSWD=1.6)的继承锆石, 表明地壳物质参与成岩过程。结合鲁西燕山期构造演化过程, 认为微山正长岩类形成于华北克拉通中生代构造体制转折后的伸展背景下, 成矿作用与碱性杂岩体的演化有关。

关键词: 鲁西地块, 微山稀土矿, 正长岩, 锆石U-Pb年龄

CLC Number:

P597

Yuwei LIANG, Yong LAI, Hong HU, Feng ZHANG. Zircon U-Pb Ages and Geochemical Characteristics Study of Syenite
from Weishan REE Deposit, Western Shandong[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2017, 53(4): 652-666.

梁雨薇, 赖勇, 胡弘, 张丰. 山东省微山稀土矿正长岩类锆石U-Pb年代学及地球化学特征研究[J]. 北京大学学报自然科学版, 2017, 53(4): 652-666.

Figures/Tables 15

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分析项	石英正长岩				霓辉石英正长斑岩
分析项	ws-12	ws-42	ws-56	ws-59	ws-37	ws-62	ws-78
SiO₂	58.00	63.53	67.90	66.80	62.41	68.10	73.60
TiO₂	0.35	0.16	0.15	0.16	0.22	0.15	0.08
Al₂O₃	18.90	13.82	15.15	14.85	13.98	14.92	12.87
TFe₂O₃	3.26	1.65	1.44	2.18	3.53	1.54	1.03
MgO	0.32	0.43	0.24	0.28	0.66	0.24	0.13
K₂O	5.75	3.40	4.34	2.59	2.64	4.56	5.53
Na₂O	6.19	6.32	6.26	7.19	6.42	5.95	3.87
CaO	2.34	3.19	1.59	1.86	5.69	1.36	1.25
BaO	0.46	0.33	0.24	0.37	1.02	0.28	0.21
MnO	0.18	0.11	0.08	0.10	0.24	0.08	0.06
P₂O₅	0.12	0.17	0.04	0.05	0.60	0.05	0.02
LOI	3.78	6.81	2.56	3.26	2.62	2.61	1.20
总和	99.65	99.92	99.94	99.66	100.03	99.80	99.86
A/NK	1.15	0.98	1.01	1.02	1.04	1.01	1.04
A/CNK	0.91	0.70	0.85	0.82	0.59	0.87	0.88
K₂O+Na₂O	11.94	9.72	10.60	9.78	9.06	10.51	9.40
K₂O/Na₂O	0.93	0.54	0.69	0.36	0.41	0.77	1.43
σ	9.50	4.60	4.52	4.02	4.23	4.41	2.89

分析项	石英正长岩				霓辉石英正长斑岩
分析项	ws-12	ws-42	ws-56	ws-59	ws-37	ws-62	ws-78
SiO₂	58.00	63.53	67.90	66.80	62.41	68.10	73.60
TiO₂	0.35	0.16	0.15	0.16	0.22	0.15	0.08
Al₂O₃	18.90	13.82	15.15	14.85	13.98	14.92	12.87
TFe₂O₃	3.26	1.65	1.44	2.18	3.53	1.54	1.03
MgO	0.32	0.43	0.24	0.28	0.66	0.24	0.13
K₂O	5.75	3.40	4.34	2.59	2.64	4.56	5.53
Na₂O	6.19	6.32	6.26	7.19	6.42	5.95	3.87
CaO	2.34	3.19	1.59	1.86	5.69	1.36	1.25
BaO	0.46	0.33	0.24	0.37	1.02	0.28	0.21
MnO	0.18	0.11	0.08	0.10	0.24	0.08	0.06
P₂O₅	0.12	0.17	0.04	0.05	0.60	0.05	0.02
LOI	3.78	6.81	2.56	3.26	2.62	2.61	1.20
总和	99.65	99.92	99.94	99.66	100.03	99.80	99.86
A/NK	1.15	0.98	1.01	1.02	1.04	1.01	1.04
A/CNK	0.91	0.70	0.85	0.82	0.59	0.87	0.88
K₂O+Na₂O	11.94	9.72	10.60	9.78	9.06	10.51	9.40
K₂O/Na₂O	0.93	0.54	0.69	0.36	0.41	0.77	1.43
σ	9.50	4.60	4.52	4.02	4.23	4.41	2.89

分析项	石英正长岩				霓辉石英正长斑岩
分析项	ws-12	ws-42	ws-56	ws-59	ws-37	ws-62	ws-78
La	376.0	368.0	189.0	864.0	1045.0	253.0	199.5
Ce	701	635	28	1165	2140	392	316
Pr	70.7	62.5	27.7	102.0	236.0	37.0	29.6
Nd	208.0	178.5	91.4	310.0	719.0	120.0	80.8
Sm	34.8	27.3	12.8	34.7	103.0	16.7	10.8
Eu	7.92	6.92	2.76	6.30	23.40	3.85	2.13
Tb	1.79	1.77	0.64	1.10	5.00	0.83	0.53
Dy	7.69	7.63	2.91	4.48	20.90	3.79	2.62
Ho	1.22	1.16	0.49	0.76	3.17	0.61	0.42
Er	3.26	2.95	1.47	1.65	8.07	1.37	1.21
Tm	0.51	0.42	0.19	0.26	1.04	0.22	0.19
Yb	2.53	2.04	1.33	1.36	5.49	1.21	1.14
Lu	0.42	0.28	0.19	0.20	0.73	0.15	0.18
Y	37.5	39.1	14.3	19.3	107.5	17.2	15.3
Zr	931	357	303	299	296	344	271
Hf	12.9	5.7	6.3	6.0	4.4	6.7	5.1
V	55	37	5	11	13	9	<5
Ga	29.2	24.0	21.9	27.1	28.2	24.9	16.4
Nb	143.0	117.5	53.3	56.1	124.5	76.2	45.9
Ta	5.3	3.3	1.4	1.2	2.6	1.4	1.7
Th	33.2	160.5	120.0	193.0	56.6	163.0	48.0
U	22.8	45.6	15.2	24.0	9.93	23.9	31.1
Rb	147.5	67.4	105.0	62.9	55.6	110.0	213.0
Sr	1675	3140	988	2020	1655	2100	814
Ba	4120	3070	2210	3520	8220	2720	1910
Cr	<10	<10	10	10	<10	10	<10
Cs	0.40	0.38	0.23	0.20	0.21	0.31	3.51
Sn	2	2	1	1	1	1	1
W	5	<1	2	2	2	3	2
Gd	16.45	14.80	6.47	12.70	47.60	7.86	4.87
ΣREE	1453	1334	633	2511	4418	848	660

分析项	石英正长岩				霓辉石英正长斑岩
分析项	ws-12	ws-42	ws-56	ws-59	ws-37	ws-62	ws-78
La	376.0	368.0	189.0	864.0	1045.0	253.0	199.5
Ce	701	635	28	1165	2140	392	316
Pr	70.7	62.5	27.7	102.0	236.0	37.0	29.6
Nd	208.0	178.5	91.4	310.0	719.0	120.0	80.8
Sm	34.8	27.3	12.8	34.7	103.0	16.7	10.8
Eu	7.92	6.92	2.76	6.30	23.40	3.85	2.13
Tb	1.79	1.77	0.64	1.10	5.00	0.83	0.53
Dy	7.69	7.63	2.91	4.48	20.90	3.79	2.62
Ho	1.22	1.16	0.49	0.76	3.17	0.61	0.42
Er	3.26	2.95	1.47	1.65	8.07	1.37	1.21
Tm	0.51	0.42	0.19	0.26	1.04	0.22	0.19
Yb	2.53	2.04	1.33	1.36	5.49	1.21	1.14
Lu	0.42	0.28	0.19	0.20	0.73	0.15	0.18
Y	37.5	39.1	14.3	19.3	107.5	17.2	15.3
Zr	931	357	303	299	296	344	271
Hf	12.9	5.7	6.3	6.0	4.4	6.7	5.1
V	55	37	5	11	13	9	<5
Ga	29.2	24.0	21.9	27.1	28.2	24.9	16.4
Nb	143.0	117.5	53.3	56.1	124.5	76.2	45.9
Ta	5.3	3.3	1.4	1.2	2.6	1.4	1.7
Th	33.2	160.5	120.0	193.0	56.6	163.0	48.0
U	22.8	45.6	15.2	24.0	9.93	23.9	31.1
Rb	147.5	67.4	105.0	62.9	55.6	110.0	213.0
Sr	1675	3140	988	2020	1655	2100	814
Ba	4120	3070	2210	3520	8220	2720	1910
Cr	<10	<10	10	10	<10	10	<10
Cs	0.40	0.38	0.23	0.20	0.21	0.31	3.51
Sn	2	2	1	1	1	1	1
W	5	<1	2	2	2	3	2
Gd	16.45	14.80	6.47	12.70	47.60	7.86	4.87
ΣREE	1453	1334	633	2511	4418	848	660

点号	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U					²⁰⁶Pb/²³⁸U					²⁰⁷Pb/²⁰⁶Pb				²⁰⁷Pb/²³⁵U				²⁰⁶Pb/²³⁸U
点号	比值	误差(1σ)	比值			误差(1σ)		比值	误差(1σ)				年龄/ Ma		误差(1σ)		年龄/ Ma		误差(1σ)		年龄/ Ma		误差(1σ)
WSZ01-01	0.16681	0.00236	10.22980			0.14046		0.44465	0.00479				2526		11		2456		13		2371		21
WSZ01-02	0.16848	0.00230	10.68418			0.14126		0.45980	0.00481				2543		10		2496		12		2439		21
WSZ01-03	0.16970	0.00255	11.19197			0.16576		0.47819	0.00548				2555		12		2539		14		2519		24
WSZ01-04	0.16900	0.00241	10.68451			0.14824		0.45839	0.00498				2548		11		2496		13		2432		22
WSZ01-05	0.16664	0.00228	10.24058			0.13553		0.44558	0.00466				2524		10		2457		12		2376		21
WSZ01-06	0.16983	0.00242	11.49909			0.15959		0.49094	0.00534				2556		11		2565		13		2575		23
WSZ01-07	0.16720	0.00242	10.94928			0.15452		0.47481	0.00523				2530		11		2519		13		2505		23
WSZ01-08	0.16704	0.00229	11.72940			0.15552		0.50911	0.00533				2528		10		2583		12		2653		23
WSZ01-09	0.16903	0.00247	11.13413			0.15909		0.47761	0.00530				2548		11		2534		13		2517		23
WSZ01-10	0.16717	0.00252	11.34056			0.16825		0.49186	0.00563				2530		12		2552		14		2579		24
WSZ01-11	0.16764	0.00223	10.99816			0.14075		0.47569	0.00483				2534		10		2523		12		2508		21
WSZ01-12	0.16689	0.00231	10.81680			0.14501		0.46994	0.00494				2527		10		2508		12		2483		22
WSZ01-13	0.16769	0.00232	11.06888			0.14812		0.47860	0.00503				2535		10		2529		12		2521		22
WSZ01-14	0.16662	0.00245	10.95160			0.15759		0.47657	0.00530				2524		11		2519		13		2512		23
WSZ01-15	0.16743	0.00247	10.91428			0.15771		0.47264	0.00527				2532		11		2516		13		2495		23
WSZ01-16	0.16989	0.00257	11.13158			0.16499		0.47508	0.00540				2557		12		2534		14		2506		24
WSZ01-17	0.16748	0.00236	9.97366			0.13589		0.43177	0.00456				2533		11		2432		13		2314		21
WSZ01-18	0.16703	0.00232	10.43679			0.13984		0.45304	0.00473				2528		10		2474		12		2409		21
WSZ01-19	0.16594	0.00253	11.24682			0.16830		0.49142	0.00560				2517		12		2544		14		2577		24
WSZ01-20	0.16553	0.00267	11.09418			0.17678		0.48594	0.00580				2513		13		2531		15		2553		25
WSZ01-21	0.17007	0.00299	11.4988			0.20254		0.49023	0.00642				2558		14		2564		16		2572		28
WSZ02-01	0.04882	0.00092	0.13438			0.00243		0.01996	0.00021				139		23		128		2		127		1
WSZ02-02	0.04826	0.00089	0.13460			0.00238		0.02022	0.00021				112		23		128		2		129		1
WSZ02-03	0.04976	0.00102	0.13845			0.00272		0.02017		0.00022			184		26		132		2		129		1
WSZ02-04	0.04885	0.00094	0.14297			0.00264		0.02122		0.00022			141		24		136		2		135		1
WSZ02-05	0.04799	0.00085	0.13454			0.00230		0.02033		0.00021			99		22		128		2		130		1
WSZ02-06	0.04958	0.00096	0.13836			0.00257		0.02023		0.00021			175		25		132		2		129		1
WSZ02-07	0.05003	0.00119	0.14011			0.00320		0.02031		0.00023			196		32		133		3		130		1
WSZ02-08	0.04974	0.00092	0.14092			0.00249		0.02054		0.00022			183		22		134		2		131		1
WSZ02-09	0.04777	0.00088	0.13447			0.00239		0.02041		0.00021			88		23		128		2		130		1
WSZ02-10	0.04924	0.00093	0.14206			0.00258		0.02092		0.00022			159		24		135		2		133		4
WSZ02-11	0.04860	0.00097	0.13827			0.00266		0.02063		0.00022			129		26		132		2		132		4
WSZ02-12	0.05149	0.00104	0.14622			0.00283		0.02059		0.00022			263		25		139		3		131		4
WSZ02-13	0.04783	0.00092	0.13677			0.00252		0.02073		0.00022			91		24		130		2		132		4
WSZ02-14	0.05376	0.00103	0.15594			0.00285		0.02103		0.00022			361		23		147		3		134		4
WSZ02-15	0.05175	0.00102	0.13920			0.00263		0.01950		0.00021			274		23		132		2		124		1
WSZ02-16	0.05211	0.00102	0.14252			0.00269		0.01983		0.00021			290		24		135		2		127		1
WSZ02-17	0.05071	0.00098	0.13751			0.00256		0.01966		0.00021			228		24		131		2		126		1
WSZ02-18	0.05032	0.00103	0.13945			0.00274		0.02009		0.00022			210		26		133		2		128		1
点号	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U					²⁰⁶Pb/²³⁸U					²⁰⁷Pb/²⁰⁶Pb				²⁰⁷Pb/²³⁵U				²⁰⁶Pb/²³⁸U
点号	比值	误差(1σ)	比值			误差(1σ)		比值	误差(1σ)				年龄/ Ma		误差(1σ)		年龄/ Ma		误差(1σ)		年龄/ Ma		误差(1σ)
WSZ03-01	0.16594	0.00310	10.70773			0.19544		0.46784	0.00573			2517		15		2498		17		2474		25
WSZ03-02	0.05612	0.00140		0.15160	0.00365		0.01959		0.00023		457			33		143		3		125		1
WSZ03-03	0.05589	0.00155		0.15544	0.00414		0.02016		0.00024		448			38		147		4		129		2
WSZ03-04	0.16415	0.00282		10.07293	0.16624		0.44490		0.00483		2499			14		2441		15		2373		22
WSZ03-05	0.16488	0.00330		10.16365	0.17105		0.44707		0.00486		2506			34		2450		16		2382		22
WSZ03-06	0.16574	0.00286		10.00116	0.16596		0.43749		0.00473		2515			14		2435		15		2339		21
WSZ03-07	0.15588	0.00275		8.85009	0.15002		0.41161		0.00453		2411			15		2323		15		2222		21
WSZ03-08	0.05085	0.00165		0.13536	0.00423		0.01930		0.00025		234			48		129		4		123		2
WSZ03-09	0.04843	0.00207		0.13148	0.00537		0.01969		0.00024		121			97		125		5		126		2
WSZ03-10	0.05104	0.00149		0.13844	0.00391		0.01967		0.00024		234			43		132		3		126		2
WSZ03-11	0.16356	0.00314		10.78187	0.20209		0.47793		0.00585		2493			16		2505		17		2518		26
WSZ03-12	0.16534	0.00299		10.5608	0.18422		0.46309		0.00521		2511			15		2485		16		2453		23
WSZ03-13	0.16018	0.00285		9.19985	0.15730		0.41640		0.00455		2458			15		2358		16		2244		21
WSZ03-14	0.16621	0.00298		10.14567	0.17436		0.44254		0.00479		2520			63		2448		16		2362		21
WSZ03-15	0.15647	0.00353		9.67410	0.21576		0.44826		0.00642		2418			20		2404		21		2388		29
WSZ03-16	0.04785	0.00168		0.13309	0.00452		0.02016		0.00026		92			55		127		4		129		2
WSZ03-17	0.04932	0.00145		0.13167	0.00373		0.01935		0.00024		163			43		126		3		124		2
WSZ03-18	0.16714	0.00315		11.07766	0.20137		0.48050		0.00552		2529			16		2530		7		2529		24
WSZ03-19	0.16413	0.00337		10.71120	0.21571		0.47314		0.00610		2499			18		2498		19		2497		27
WSZ03-20	0.05006	0.00137		0.13055	0.00344		0.01891		0.00023		198			39		125		3		121		1
WSZ03-21	0.05812	0.00958		0.15148	0.02485		0.01890		0.00031		534			369		143		22		121		2
WSZ03-22	0.16684	0.00309		11.12223	0.19795		0.49330		0.00534		2526			16		2533		17		2542		23
WSZ03-23	0.15632	0.00317		10.19614	0.20191		0.47289		0.00590		2416			18		2453		18		2496		26
WSZ03-24	0.04967	0.00133		0.12778	0.00329		0.01865		0.00022		180			38		122		3		119		1
WSZ03-25	0.04864	0.00167		0.13041	0.00434		0.01944		0.00025		131			54		124		4		124		2
WSZ03-26	0.05031	0.00239		0.12911	0.00594		0.01861		0.00022		209			111		123		5		119		1
WSZ03-27	0.17222	0.00331		11.56167	0.21373		0.48673		0.00553		2579			16		2570		17		2557		24
WSZ03-28	0.04993	0.00296		0.13348	0.00769		0.01939		0.00027		192			136		127		7		124		2