鲁西地区新太古代晚期正长-二长花岗岩成因及地质意义

doi:10.19657/j.geoscience.1000-8527.2022.04.18

摘要/Abstract

摘要：

鲁西地区位于华北克拉通东部,是研究区域太古宙演化的重要地区。以鲁西地区西南部出露的正长-二长花岗岩为研究对象,系统开展了岩石学、地球化学、锆石U-Pb年龄与Hf同位素组成研究。结果表明,该正长-二长花岗岩为钙碱性、过铝质。锆石U-Pb年龄揭示正长-二长花岗岩侵位于~2 540~2 530 Ma;锆石Hf同位素组成表明其主体由~2.70 Ga的TTG类岩石熔融形成,但再循环的古老地壳组分也参与了岩浆产生过程。微量元素和同位素组成模拟计算结果表明,正长-二长花岗岩是由97%的新生TTG地壳组分部分熔融和3%的变质表壳岩部分熔融物混合形成。结合区域特征,我们认为正长-二长花岗岩形成于伸展构造环境中,该区新太古代晚期岩浆作用与板片俯冲后回撤作用有关,板片回撤过程所致的软流圈上涌为此类岩石的岩浆产生提供了热源。

关键词: 华北克拉通, 正长-二长花岗岩, 新太古代晚期, 板片回撤, 鲁西地区

Abstract:

The Western Shandong is located in the east of North China Craton, which is an important area to study the Archean evolution.Petrology, geochemistry and zircon U-Pb dating and Hf isotopic composition were studied on the syeno-monzogranite in the southwest of Western Shandong Province.The syeno-monzogranite is characterized by calc-alkaline and peraluminous affinities.Zircon U-Pb dating shows that the syeno-monzogra-nite emplaced at~2 540 Ma to~2 530 Ma.Zircon Hf isotopic compositions show that they were primarily molten by TTG rocks of~2.70 Ga, and there is recycled ancient crustal component. The mixing calculation results under constraints of isotopic and trace element compositions confirm that the primary magma of syeno-monzogranite is composed of the mixing of 97% of the juvenile TTG crustal material after partial melting and 3% of metamorphic supracrustal rocks after partial melting.Combined with previous studies, we propose that the syeno-monzogranite was formed in an extensional tectonic environment.The late Neoarchean magmatism in Western Shandong was related to slab rollback.The upwelling of asthenosphere caused by the rollback provided heat source for the formation of this group of rocks.

Key words: North China Craton, syeno-monzogranite, late Neoarchean, rollback, Western Shandong

中图分类号:

P597
P588.12

杨帆, 陈岳龙, 于洋. 鲁西地区新太古代晚期正长-二长花岗岩成因及地质意义[J]. 现代地质, 2022, 36(04): 1155-1172.

YANG Fan, CHEN Yuelong, YU Yang. Genesis and Geological Significance of Late Archean Syeno-monzogranite in Western Shandong Province[J]. Geoscience, 2022, 36(04): 1155-1172.

图/表 14

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序号	样品号	岩性	采样位置	经度	纬度
1	TA1801-1	中细粒正长花岗岩	花果峪村(平邑—郑家峪剖面)	E117°31.746'	N35°28.811'
2	TA1808-1	细粒正长花岗岩	庞庄—城前镇剖面	E117°26.631'	N35°21.618'
3	TA1808-2	弱片麻状似斑状二长花岗岩	庞庄—城前镇剖面	E117°26.631'	N35°21.618'
4	TA1809	片麻状二长花岗岩	庞庄—城前镇剖面	E117°26.164'	N35°21.319'
5	TA1817	细粒二长花岗岩	东郭镇—店子镇—城前镇	E117°19.281'	N35°12.237'
6	TA1818	细粒正长花岗岩	东郭镇—店子镇—城前镇	E117°19.378'	N35°12.745'

序号	样品号	岩性	采样位置	经度	纬度
1	TA1801-1	中细粒正长花岗岩	花果峪村(平邑—郑家峪剖面)	E117°31.746'	N35°28.811'
2	TA1808-1	细粒正长花岗岩	庞庄—城前镇剖面	E117°26.631'	N35°21.618'
3	TA1808-2	弱片麻状似斑状二长花岗岩	庞庄—城前镇剖面	E117°26.631'	N35°21.618'
4	TA1809	片麻状二长花岗岩	庞庄—城前镇剖面	E117°26.164'	N35°21.319'
5	TA1817	细粒二长花岗岩	东郭镇—店子镇—城前镇	E117°19.281'	N35°12.237'
6	TA1818	细粒正长花岗岩	东郭镇—店子镇—城前镇	E117°19.378'	N35°12.745'

样品号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O		P₂O₅	烧失量		总量	K₂O/Na₂O
TA1801-1	72.16	0.34	14.3	1.42	0.01	0.19	0.55	2.60	7.67		0.02	0.60		102.81	2.95
TA1808-1	75.92	0.07	12.96	0.72	<0.01	0.14	0.85	3.08	5.41		0.02	0.43		101.36	1.76
TA1808-2	74.47	0.08	13.78	0.89	<0.01	0.20	1.02	3.68	4.64		0.02	0.61		100.65	1.26
TA1809	76.64	0.06	13.04	0.73	0.01	0.12	0.61	3.80	4.61		0.01	0.50		101.34	1.21
TA1817	73.00	0.16	14.26	1.45	0.01	0.29	1.08	3.87	4.56		0.05	0.86		100.77	1.18
TA1818	74.44	0.10	13.57	1.11	0.01	0.16	0.61	3.60	5.32		0.03	0.71		101.14	1.48
样品号	A/CNK	A/NK	Mg^#	Li	Be	Sc	Ti	V	Cr		Mn	Co		Ni	Cu
TA1801-1	1.09	1.13	21	6.25	1.00	3.36	2 113.57	13.16	6.44		113.48	1.27		4	4.66
TA1808-1	1.11	1.18	28	2.73	1.58	0.98	522.45	11.75	4.38		31.01	1.13		3	17.8
TA1808-2	1.15	1.24	31	2.96	0.84	0.89	534.65	7.50	2.67		52.76	1.10		2	1.93
TA1809	1.11	1.16	25	4.93	1.87	1.31	452.95	6.20	1.23		85.33	0.75		1	4.95
TA1817	1.16	1.26	28	22.96	1.77	1.95	974.31	11.09	2.72		113.67	1.48		2	5.05
TA1818	1.11	1.16	22	7.04	1.90	1.65	669.47	9.02	0.50		122.68	1.08		1	3.7
样品号	Zn	Ga	As	Se	Rb	Sr	Y	Zr	Nb		Mo	Sn		Cs	Ba
TA1801-1	15.60	15.94	1.60	0.73	229	142	14.5	354	19.3		0.82	2.39		3.39	578
TA1808-1	6.95	13.06	0.43	0.13	175	276	3.53	78.6	7.12		4.9	0.53		2.44	386
TA1808-2	10.85	12.03	0.41	0.08	146	304	2.79	70.8	2.25		0.17	0.26		2.44	1 179
TA1809	11.86	14.90	0	0.12	156	102	3.93	58.3	5.99		0.07	0.59		2.70	266
TA1817	26.54	15.50	1.16	0.31	196	206	4.95	133	6.77		0.09	1.00		2.87	839
TA1818	21.47	14.95	1.03	0.3	282	135	7.57	123	10.5		0.22	1.30		5.11	712
样品号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy		Ho	Er		Tm	Yb
TA1801-1	26.50	83.1	7.44	26.8	4.99	0.71	3.39	0.54	3.11		0.62	1.82		0.31	2.07
TA1808-1	5.05	15.6	1.17	4.36	0.8	0.20	0.65	0.09	0.56		0.11	0.36		0.06	0.44
TA1808-2	13.60	15.5	2.08	6.85	0.95	0.41	0.62	0.08	0.43		0.09	0.28		0.05	0.35
TA1809	4.18	14.0	1.02	3.87	0.69	0.17	0.61	0.09	0.52		0.11	0.35		0.06	0.48
TA1817	27.30	31.7	4.94	15.5	2.3	0.50	1.48	0.2	0.96		0.18	0.52		0.08	0.52
TA1818	20.10	41.5	3.70	12.5	2.08	0.42	1.65	0.24	1.28		0.25	0.70		0.11	0.74
样品号	Lu	Hf	Ta	Pb	Th	U	REE	(La/Yb)_N		(La/Sm)_N			(Gd/Yb)_N			δEu
TA1801-1	0.27	8.84	2.1	19.6	10.9	3.28	161.69	9.18		3.43			1.35			0.53
TA1808-1	0.07	3.21	0.71	18.8	22.5	6.00	29.54	8.23		4.08			1.22			0.85
TA1808-2	0.06	1.80	0.24	15.3	17.7	1.99	41.33	27.9		9.24			1.47			1.63
TA1809	0.08	2.69	0.64	20.6	18.7	3.54	26.24	6.25		3.91			1.05			0.80
TA1817	0.08	3.38	0.63	16.0	15.3	1.60	86.16	37.66		7.66			2.35			0.83
TA1818	0.11	3.51	1.48	13.3	19.6	2.62	85.41	19.48		6.24			1.84			0.69

样品号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O		P₂O₅	烧失量		总量	K₂O/Na₂O
TA1801-1	72.16	0.34	14.3	1.42	0.01	0.19	0.55	2.60	7.67		0.02	0.60		102.81	2.95
TA1808-1	75.92	0.07	12.96	0.72	<0.01	0.14	0.85	3.08	5.41		0.02	0.43		101.36	1.76
TA1808-2	74.47	0.08	13.78	0.89	<0.01	0.20	1.02	3.68	4.64		0.02	0.61		100.65	1.26
TA1809	76.64	0.06	13.04	0.73	0.01	0.12	0.61	3.80	4.61		0.01	0.50		101.34	1.21
TA1817	73.00	0.16	14.26	1.45	0.01	0.29	1.08	3.87	4.56		0.05	0.86		100.77	1.18
TA1818	74.44	0.10	13.57	1.11	0.01	0.16	0.61	3.60	5.32		0.03	0.71		101.14	1.48
样品号	A/CNK	A/NK	Mg^#	Li	Be	Sc	Ti	V	Cr		Mn	Co		Ni	Cu
TA1801-1	1.09	1.13	21	6.25	1.00	3.36	2 113.57	13.16	6.44		113.48	1.27		4	4.66
TA1808-1	1.11	1.18	28	2.73	1.58	0.98	522.45	11.75	4.38		31.01	1.13		3	17.8
TA1808-2	1.15	1.24	31	2.96	0.84	0.89	534.65	7.50	2.67		52.76	1.10		2	1.93
TA1809	1.11	1.16	25	4.93	1.87	1.31	452.95	6.20	1.23		85.33	0.75		1	4.95
TA1817	1.16	1.26	28	22.96	1.77	1.95	974.31	11.09	2.72		113.67	1.48		2	5.05
TA1818	1.11	1.16	22	7.04	1.90	1.65	669.47	9.02	0.50		122.68	1.08		1	3.7
样品号	Zn	Ga	As	Se	Rb	Sr	Y	Zr	Nb		Mo	Sn		Cs	Ba
TA1801-1	15.60	15.94	1.60	0.73	229	142	14.5	354	19.3		0.82	2.39		3.39	578
TA1808-1	6.95	13.06	0.43	0.13	175	276	3.53	78.6	7.12		4.9	0.53		2.44	386
TA1808-2	10.85	12.03	0.41	0.08	146	304	2.79	70.8	2.25		0.17	0.26		2.44	1 179
TA1809	11.86	14.90	0	0.12	156	102	3.93	58.3	5.99		0.07	0.59		2.70	266
TA1817	26.54	15.50	1.16	0.31	196	206	4.95	133	6.77		0.09	1.00		2.87	839
TA1818	21.47	14.95	1.03	0.3	282	135	7.57	123	10.5		0.22	1.30		5.11	712
样品号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy		Ho	Er		Tm	Yb
TA1801-1	26.50	83.1	7.44	26.8	4.99	0.71	3.39	0.54	3.11		0.62	1.82		0.31	2.07
TA1808-1	5.05	15.6	1.17	4.36	0.8	0.20	0.65	0.09	0.56		0.11	0.36		0.06	0.44
TA1808-2	13.60	15.5	2.08	6.85	0.95	0.41	0.62	0.08	0.43		0.09	0.28		0.05	0.35
TA1809	4.18	14.0	1.02	3.87	0.69	0.17	0.61	0.09	0.52		0.11	0.35		0.06	0.48
TA1817	27.30	31.7	4.94	15.5	2.3	0.50	1.48	0.2	0.96		0.18	0.52		0.08	0.52
TA1818	20.10	41.5	3.70	12.5	2.08	0.42	1.65	0.24	1.28		0.25	0.70		0.11	0.74
样品号	Lu	Hf	Ta	Pb	Th	U	REE	(La/Yb)_N		(La/Sm)_N			(Gd/Yb)_N			δEu
TA1801-1	0.27	8.84	2.1	19.6	10.9	3.28	161.69	9.18		3.43			1.35			0.53
TA1808-1	0.07	3.21	0.71	18.8	22.5	6.00	29.54	8.23		4.08			1.22			0.85
TA1808-2	0.06	1.80	0.24	15.3	17.7	1.99	41.33	27.9		9.24			1.47			1.63
TA1809	0.08	2.69	0.64	20.6	18.7	3.54	26.24	6.25		3.91			1.05			0.80
TA1817	0.08	3.38	0.63	16.0	15.3	1.60	86.16	37.66		7.66			2.35			0.83
TA1818	0.11	3.51	1.48	13.3	19.6	2.62	85.41	19.48		6.24			1.84			0.69

样品分析点号	w_B/(μg/g)			同位素比值						年龄/Ma
样品分析点号	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
TA1808-2-01	983	1 557	0.631 3	0.211 5	0.005 5	1.260 0	0.070 0	0.043 2	0.003 0	2 917	39	828	32	273	19
TA1808-2-02	1 173	840	1.396 4	0.191 5	0.004 3	1.880 0	0.050 0	0.071 2	0.001 2	2 755	39	1 074	19	443	7
TA1808-2-03	4 770	3 420	1.394 7	0.258 9	0.003 4	1.235 0	0.025 5	0.034 6	0.000 9	3 240	21	817	12	219	6
TA1808-2-04	461	656	0.702 7	0.173 3	0.002 8	7.480 0	0.130 0	0.313 0	0.003 6	2 590	28	2 171	16	1 755	18
TA1808-2-05	3 450	4 570	0.754 9	0.224 2	0.003 2	1.487 0	0.027 5	0.048 1	0.001 2	3 011	24	925	11	303	7
TA1808-2-06	2 060	3 110	0.662 4	0.245 7	0.004 1	0.935 0	0.045 0	0.027 6	0.001 4	3 157	26	670	23	176	9
TA1808-2-07	3 190	3 770	0.846 2	0.201 5	0.003 6	1.420 0	0.050 0	0.051 1	0.002 5	2 839	28	897	21	321	15
TA1808-2-08	244	283	0.862 2	0.169 5	0.002 6	8.310 0	0.130 0	0.355 5	0.003 7	2 553	26	2 265	15	1 961	17
TA1808-2-09	704	1 184	0.594 6	0.180 0	0.004 0	1.420 0	0.050 0	0.057 2	0.002 0	2 653	38	897	21	359	12
TA1808-2-10	3 460	1 700	2.035 3	0.240 0	0.003 2	1.671 0	0.046 0	0.050 5	0.001 5	3 120	24	998	18	318	9
TA1808-2-11	6 180	6 800	0.908 8	0.219 8	0.003 5	1.170 0	0.065 0	0.038 6	0.002 6	2 979	31	787	31	244	16
TA1808-2-12	1 221	1 460	0.836 3	0.218 6	0.003 7	1.519 0	0.045 0	0.050 4	0.001 8	2 970	31	938	19	317	11
TA1808-2-13	228	228	1.000 0	0.205 2	0.006 0	3.400 0	0.125 0	0.120 2	0.003 9	2 868	48	1 504	31	732	22
TA1808-2-14	3 030	2 720	1.114 0	0.202 8	0.002 9	1.560 0	0.050 0	0.055 8	0.001 9	2 849	22	954	20	350	12
TA1808-2-15	345	799	0.431 8	0.168 5	0.003 2	2.590 0	0.055 0	0.111 5	0.002 1	2 543	31	1 298	16	681	12
TA1808-2-16	760	864	0.879 6	0.172 3	0.002 7	2.770 0	0.060 0	0.116 6	0.002 3	2 580	29	1 347	16	711	13
TA1808-2-17	308	486	0.633 7	0.173 0	0.002 7	5.740 0	0.095 0	0.240 6	0.004 8	2 587	26	1 937	15	1 390	25
TA1808-2-18	4 400	2 810	1.565 8	0.208 7	0.003 5	2.250 0	0.060 0	0.078 2	0.001 5	2 895	28	1 197	19	485	9
TA1808-2-19	6 090	2 410	2.527 0	0.195 0	0.002 9	1.960 0	0.060 0	0.072 9	0.002 5	2 785	24	1 102	20	454	15
TA1808-2-20	262 0	290 0	0.903 4	0.218 8	0.002 4	1.810 0	0.050 0	0.060 0	0.001 9	2 972	19	1 049	20	376	12
TA1817-01	787	661	1.190 6	0.173 2	0.001 4	5.040 0	0.150 0	0.211 0	0.006 0	2 589	14	1 826	28	1 234	33
TA1817-02	162	254	0.637 8	0.198 1	0.006 0	6.310 0	0.220 0	0.231 0	0.011 0	2 811	43	2 020	31	1 340	55
TA1817-03	860	1 020	0.843 1	0.232 4	0.002 6	5.410 0	0.150 0	0.168 8	0.003 8	3 069	20	1 886	21	1 005	21
TA1817-04	417	574	0.726 5	0.173 7	0.001 7	6.540 0	0.150 0	0.273 0	0.006 5	2 594	16	2 051	21	1 556	33
TA1817-05	990	970	1.020 6	0.191 3	0.005 0	5.250 0	0.335 0	0.199 0	0.011 5	2 754	42	1 861	46	1 170	55
TA1817-06	287	484	0.593 0	0.191 0	0.003 6	7.320 0	0.150 0	0.278 0	0.007 5	2 751	28	2 151	19	1 581	39
TA1817-07	1 100	1 039	1.058 7	0.176 6	0.001 7	3.370 0	0.110 0	0.138 4	0.004 8	2 621	18	1 497	26	836	27
TA1817-08	313	402	0.778 6	0.181 2	0.002 8	7.320 0	0.230 0	0.293 0	0.008 5	2 664	25	2 151	24	1 657	40
TA1817-09	167	306	0.545 8	0.171 1	0.001 8	8.800 0	0.215 0	0.373 0	0.009 0	2 569	18	2 317	22	2 044	41
TA1817-10	340	1 050	0.323 8	0.185 8	0.003 4	2.990 0	0.060 0	0.116 7	0.001 8	2 706	27	1 405	17	712	11
TA1817-11	1 320	1 110	1.189 2	0.178 0	0.003 0	4.600 0	0.080 0	0.187 4	0.002 3	2 635	28	1 749	15	1 107	13
TA1817-12	230	303	0.759 1	0.172 3	0.002 2	8.480 0	0.290 0	0.357 0	0.013 0	2 580	20	2 284	37	1 968	65
TA1817-13	640	352	1.818 2	0.171 0	0.003 9	8.040 0	0.375 0	0.341 0	0.018 0	2 567	32	2 236	50	1 891	90
TA1817-14	6 400	1 700	3.764 7	0.201 1	0.003 1	3.410 0	0.385 0	0.123 0	0.015 5	2 835	22	1 507	60	748	75
TA1817-15	512	776	0.659 8	0.158 5	0.001 2	5.130 0	0.105 0	0.234 7	0.004 4	2 440	13	1 841	18	1 359	24
TA1817-16	215	278	0.773 4	0.172 6	0.002 6	8.780 0	0.285 0	0.369 0	0.012 5	2 583	24	2 315	33	2 025	60
TA1817-17	301	359	0.838 4	0.166 7	0.001 7	8.410 0	0.245 0	0.366 0	0.010 5	2 524	18	2 276	33	2 011	50
TA1817-18	153	131	1.167 9	0.171 9	0.002 9	11.260 0	0.245 0	0.475 0	0.005 5	2 576	27	2 545	20	2 505	24
TA1817-19	750	580	1.293 1	0.164 9	0.002 0	6.410 0	0.175 0	0.282 0	0.008 0	2 506	20	2 034	26	1 601	41
TA1817-20	3 090	2 210	1.398 2	0.163 9	0.001 6	2.700 0	0.050 0	0.119 5	0.001 9	2 496	17	1 328	15	728	11