华北克拉通南缘箕山地区新太古代末期地壳演化——来自叶寨花岗岩年代学和地球化学证据

doi:10.19657/j.geoscience.1000-8527.2024.045

摘要/Abstract

摘要：

嵩箕地区位于华北克拉通南缘,广泛发育新太古代TTG片麻岩和花岗岩,是深入研究华北克拉通早前寒武纪地质演化的重要窗口。为加深对箕山地区前寒武纪地壳演化的理解,本文选择新识别的登封杂岩叶寨花岗岩体为研究对象,开展了系统的锆石U-Pb年代学和全岩元素组成分析,以确定其形成时代、成因及构造演化过程。研究结果显示,叶寨花岗岩体锆石U-Pb谐和线上交点年龄为(2506±19) Ma,标志着其形成于新太古代末期。岩石表现出相对高硅(SiO₂=66.88%~74.14%)和富碱(Na₂O=3.15%~4.09%;K₂O=2.06%~5.36%)特征,表明其为过铝质的钙碱性至高钾钙碱性特征(A/CNK=1.03~1.27)。稀土元素分布模式显示轻稀土元素(LREE)显著富集,而重稀土元素(HREE)相对亏损,表现出不明显或弱正铕异常(δEu=0.76~1.26)。微量元素数据表明,岩石富集大离子亲石元素(如Rb、U、Th和K),同时相对亏损高场强元素(如Nb、Ti和P)。微量元素图解分析进一步揭示,叶寨花岗岩体具有高Sr、低Yb和Y的特征,Sr/Y值为22.76~123.81,接近埃达克岩的地球化学特征。综合微量元素间的关系及稀土元素特征,本文认为叶寨花岗岩体形成于岛弧构造环境,可能是由下伏幔源岩浆引发的上覆加厚下地壳部分熔融所致。这些发现为认识华北克拉通南缘的构造演化及岩浆活动提供了基础性地质证据。

关键词: 二长花岗岩, 前寒武纪, 锆石U-Pb定年, 嵩箕地区, 华北克拉通

Abstract:

The Songji area, located on the southern margin of the North China Craton, is characterized by the extensive presence of Neoarchean TTG gneiss and granite, making it a vital window for studying the early Precambrian geological evolution of the North China Craton. This study focuses on the newly identified Yezhai granite body within the Dengfeng Complex, employing geochronological and geochemical analyses to ascertain its formation age, genesis and tectonic evolution. The zircon U-Pb age of the Yezhai granite is determined to be (2,506±19) Ma, indicating its formation during the late Neoarchean period. Geochemical investigations reveal that the rock mass exhibits relatively high silica content (SiO₂=66.88%-74.14%) and is enriched in alkali elements (Na₂O=3.15%-4.09%;K₂O=2.06%-5.36%), demonstrating peraluminous calc-alkaline to high-potassium calc-alkaline characteristics (A/CNK=1.03-1.27). The rare earth elemental distribution pattern shows a right-leaning tendency, characterized by the enrichment of light rare earth elements (LREE) and depletion of heavy rare earth elements (HREE), along with a weak or inconspicuous positive europium anomaly (δEu=0.76-1.26). Trace element analysis indicates the enrichment of large ion lithophile elements (Rb, U, Th, K)and relative depletion of high field strength elements (Nb, Ti, P). The trace elements diagrams highlight features of high strontium (Sr) and low Yb and Y, with Sr/Y ratios ranging from 22.76 to 123.81, resembling the geochemical characteristics of adakite. The relationship among Nb, Y, Rb and Yb suggest similarities with island arc volcanic rocks. Overall, the findings indicate that the Yezhai granite body in Jishan area likely formed in an island arc setting, potentially resulting from the partial melting of an older, thickened lower crust in the Songji region.

Key words: monzonite granite, Precambrian, zircon U-Pb dating, Songji area, North China Craton, Precambrian

中图分类号:

郭晓伟, 杨延伟, 张宇. 华北克拉通南缘箕山地区新太古代末期地壳演化——来自叶寨花岗岩年代学和地球化学证据[J]. 现代地质, 2025, 39(01): 83-95.

GUO Xiaowei, YANG Yanwei, ZHANG Yu. Late Neoarchean Crustal Evolution of Jishan Area in the Southern Margin of North China Craton: Insights from Geochronology and Geochemistry of Yezhai Granite[J]. Geoscience, 2025, 39(01): 83-95.

图/表 9

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测点	含量(10^-6)			²³²Th/ ²³⁸U	同位素比值						年龄(Ma)
	^*Pb	Th	U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb
	^*Pb	Th	U		测值	1σ	测值	1σ	测值	1σ	测值	1σ	测值	1σ	测值	1σ
1	123.89	129	404	0.32	0.2321	0.0031	4.6012	0.0997	0.1434	0.0031	1345	16	1749	18	2269	37
2	133.67	130	361	0.36	0.2878	0.0044	6.0406	0.1411	0.1510	0.0028	1630	22	1982	20	2358	31
3	123.39	72	226	0.32	0.4470	0.0036	9.8305	0.1690	0.1586	0.0027	2382	16	2419	16	2440	28
4	129.61	97	514	0.19	0.1971	0.0019	3.9089	0.0797	0.1427	0.0025	1160	10	1616	17	2261	31
5	103.86	49	197	0.25	0.4425	0.0072	9.6157	0.2054	0.1573	0.0028	2362	32	2399	20	2428	30
6	119.43	322	341	0.94	0.2532	0.0037	5.3635	0.1190	0.1532	0.0029	1455	19	1879	19	2381	32
7	114.92	435	394	1.10	0.2140	0.0084	4.3595	0.1986	0.1464	0.0031	1250	45	1705	38	2306	37
8	119.08	66	230	0.29	0.4234	0.0036	9.7752	0.1790	0.1666	0.0029	2276	16	2414	17	2524	30
9	86.42	34	152	0.23	0.4651	0.0034	10.6077	0.2102	0.1647	0.0032	2462	15	2489	18	2506	32
10	99.77	47	227	0.21	0.3657	0.0029	8.2475	0.1573	0.1628	0.0031	2009	14	2259	17	2485	32
11	139.79	72	357	0.20	0.3293	0.0053	7.3239	0.1855	0.1603	0.0034	1835	26	2152	23	2459	30
12	113.37	135	369	0.37	0.2363	0.0031	4.7265	0.1064	0.1452	0.0034	1367	16	1772	19	2290	41
13	78.15	53	151	0.35	0.4262	0.0073	9.4510	0.2415	0.1598	0.0032	2289	33	2383	24	2453	33
14	121.02	102	344	0.30	0.2728	0.0023	5.8502	0.1063	0.1547	0.0028	1555	11	1954	16	2398	30
15	106.69	63	200	0.31	0.4327	0.0034	9.7926	0.1693	0.1634	0.0029	2318	15	2415	16	2491	30
16	130.76	60	595	0.10	0.2048	0.0076	4.3920	0.1919	0.1529	0.0028	1201	41	1711	36	2379	31
17	129.51	68	356	0.19	0.2982	0.0022	6.4728	0.1286	0.1565	0.0031	1683	11	2042	18	2418	34
18	95.84	52	168	0.31	0.4634	0.0034	10.6173	0.2118	0.1651	0.0033	2455	15	2490	19	2509	33
19	89.93	54	149	0.37	0.5010	0.0062	11.4744	0.2392	0.1652	0.0031	2618	27	2563	20	2510	33
20	131.19	94	385	0.24	0.2783	0.0065	6.0218	0.1849	0.1552	0.0028	1583	33	1979	27	2403	31
21	108.91	56	216	0.26	0.4272	0.0060	9.7276	0.2088	0.1640	0.0028	2293	27	2409	20	2498	25
22	122.86	94	247	0.38	0.3951	0.0030	8.8337	0.1504	0.1613	0.0028	2146	14	2321	16	2469	30
23	119.35	277	468	0.59	0.1759	0.0012	3.4277	0.0710	0.1405	0.0030	1045	7	1511	16	2235	36
24	143.64	141	355	0.40	0.3250	0.0028	7.1971	0.1320	0.1596	0.0028	1814	13	2136	16	2451	30

测点	含量(10^-6)			²³²Th/ ²³⁸U	同位素比值						年龄(Ma)
	^*Pb	Th	U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb
	^*Pb	Th	U		测值	1σ	测值	1σ	测值	1σ	测值	1σ	测值	1σ	测值	1σ
1	123.89	129	404	0.32	0.2321	0.0031	4.6012	0.0997	0.1434	0.0031	1345	16	1749	18	2269	37
2	133.67	130	361	0.36	0.2878	0.0044	6.0406	0.1411	0.1510	0.0028	1630	22	1982	20	2358	31
3	123.39	72	226	0.32	0.4470	0.0036	9.8305	0.1690	0.1586	0.0027	2382	16	2419	16	2440	28
4	129.61	97	514	0.19	0.1971	0.0019	3.9089	0.0797	0.1427	0.0025	1160	10	1616	17	2261	31
5	103.86	49	197	0.25	0.4425	0.0072	9.6157	0.2054	0.1573	0.0028	2362	32	2399	20	2428	30
6	119.43	322	341	0.94	0.2532	0.0037	5.3635	0.1190	0.1532	0.0029	1455	19	1879	19	2381	32
7	114.92	435	394	1.10	0.2140	0.0084	4.3595	0.1986	0.1464	0.0031	1250	45	1705	38	2306	37
8	119.08	66	230	0.29	0.4234	0.0036	9.7752	0.1790	0.1666	0.0029	2276	16	2414	17	2524	30
9	86.42	34	152	0.23	0.4651	0.0034	10.6077	0.2102	0.1647	0.0032	2462	15	2489	18	2506	32
10	99.77	47	227	0.21	0.3657	0.0029	8.2475	0.1573	0.1628	0.0031	2009	14	2259	17	2485	32
11	139.79	72	357	0.20	0.3293	0.0053	7.3239	0.1855	0.1603	0.0034	1835	26	2152	23	2459	30
12	113.37	135	369	0.37	0.2363	0.0031	4.7265	0.1064	0.1452	0.0034	1367	16	1772	19	2290	41
13	78.15	53	151	0.35	0.4262	0.0073	9.4510	0.2415	0.1598	0.0032	2289	33	2383	24	2453	33
14	121.02	102	344	0.30	0.2728	0.0023	5.8502	0.1063	0.1547	0.0028	1555	11	1954	16	2398	30
15	106.69	63	200	0.31	0.4327	0.0034	9.7926	0.1693	0.1634	0.0029	2318	15	2415	16	2491	30
16	130.76	60	595	0.10	0.2048	0.0076	4.3920	0.1919	0.1529	0.0028	1201	41	1711	36	2379	31
17	129.51	68	356	0.19	0.2982	0.0022	6.4728	0.1286	0.1565	0.0031	1683	11	2042	18	2418	34
18	95.84	52	168	0.31	0.4634	0.0034	10.6173	0.2118	0.1651	0.0033	2455	15	2490	19	2509	33
19	89.93	54	149	0.37	0.5010	0.0062	11.4744	0.2392	0.1652	0.0031	2618	27	2563	20	2510	33
20	131.19	94	385	0.24	0.2783	0.0065	6.0218	0.1849	0.1552	0.0028	1583	33	1979	27	2403	31
21	108.91	56	216	0.26	0.4272	0.0060	9.7276	0.2088	0.1640	0.0028	2293	27	2409	20	2498	25
22	122.86	94	247	0.38	0.3951	0.0030	8.8337	0.1504	0.1613	0.0028	2146	14	2321	16	2469	30
23	119.35	277	468	0.59	0.1759	0.0012	3.4277	0.0710	0.1405	0.0030	1045	7	1511	16	2235	36
24	143.64	141	355	0.40	0.3250	0.0028	7.1971	0.1320	0.1596	0.0028	1814	13	2136	16	2451	30

元素	奥长花岗岩	二长花岗岩					奥长花岗岩	英云闪长岩
元素	GS03	GS01	GS02	GS04	GS05	GS06	XD	WY
SiO₂	71.99	66.88	74.14	70.20	71.27	71.94	71.76	71.45
TiO₂	0.34	0.48	0.20	0.38	0.33	0.22	0.26	0.22
Al₂O₃	13.31	15.33	12.61	13.73	13.24	13.66	14.22	14.56
Fe₂O₃	2.26	2.37	0.95	2.18	1.89	1.24	1.20	1.33
FeO	1.14	0.18	0.30	1.10	1.32	1.20	1.47	1.26
MnO₂	0.09	0.04	0.04	0.07	0.09	0.02	0.07	0.14
MgO	0.54	1.22	0.70	1.16	0.83	0.50	0.58	0.40
CaO	1.33	0.81	0.92	1.53	1.53	0.75	1.73	1.67
Na₂O	4.09	3.15	3.37	3.54	3.29	3.25	4.14	3.90
K₂O	2.06	5.36	4.01	3.76	4.70	4.77	2.72	3.29
P₂O₅	0.13	0.15	0.04	0.14	0.15	0.04	0.07	0.08
LOI	1.66	2.11	1.10	1.75	1.60	1.27	1.56	1.46
DI	86.15	86.74	90.99	84.65	86.63	90.01	84.87	85.62
SI	5.35	9.93	7.50	9.88	6.90	4.56	5.74	3.93
A/NK	1.49	1.40	1.28	1.39	1.26	1.30	1.46	1.46
A/KNC	1.20	1.27	1.10	1.11	1.03	1.16	1.12	1.14
σ	1.29	2.95	1.73	1.94	2.24	2.20	1.62	1.80
Mg^#	23.27	48.46	51.93	40.31	32.88	28.79	28.85	22.49
Rb	67.00	183.00	124.00	148.00	155.00	170.00	-	-
K	17101.00	44495.00	33288.00	31213.00	39016.00	39597.00	22579.54	27311.28
Ba	419.26	1159.28	683.76	598.05	808.56	858.02	603.00	635.00
Th	14.42	15.88	33.11	9.33	11.10	14.98	7.37	7.29
U	0.94	1.29	1.54	1.58	1.86	2.08	0.57	0.90
Nb	4.17	13.50	2.83	6.97	8.70	7.17	7.17	6.75
Sr	137.01	297.50	249.44	255.51	249.46	308.30	271.00	245.00
P	567.00	655.00	192.00	602.00	672.00	192.00	305.52	349.17
Ta	0.24	2.23	0.10	0.78	1.36	0.96	0.69	0.72
Ti	2058.00	2879.00	1175.00	2294.00	1971.00	1306.00	1558.70	1318.90
Cr	29.60	14.90	14.50	19.60	20.00	10.80	-	-
Ni	12.4	18.70	7.71	5.42	7.42	4.22	-	-
Sr/Y	22.76	24.33	123.81	51.96	29.16	43.10	30.59	31.21
Nb/Ta	17.57	6.05	27.05	8.94	6.41	7.48	10.39	9.38
Th/Ta	60.80	7.10	316.60	12.00	8.20	15.60	10.68	10.13
Nd/Th	1.75	1.55	0.19	1.77	1.59	1.04	2.46	2.02
La	35.10	24.20	6.85	20.80	17.80	20.20	24.00	18.10
Ce	65.10	65.20	18.10	39.90	34.10	48.00	47.10	42.40
Pr	7.20	6.23	1.78	4.68	4.32	4.43	3.87	2.96
Nd	25.20	24.60	6.310	16.50	17.60	15.60	18.10	14.75
Sm	3.76	4.48	1.24	2.56	3.72	2.66	3.05	2.55
Eu	0.84	1.10	0.47	0.66	0.86	0.67	0.61	0.58
Gd	3.01	3.52	1.05	2.01	2.76	2.18	2.05	1.78
Tb	0.36	0.50	0.16	0.27	0.41	0.31	0.31	0.24
Dy	1.43	2.37	0.72	1.16	1.91	1.55	1.84	1.59
Ho	0.24	0.46	0.11	0.21	0.40	0.29	0.34	0.27
Er	0.63	1.22	0.30	0.60	0.96	0.80	0.98	0.83
Tm	0.12	0.21	0.09	0.13	0.18	0.16	0.15	0.14
Yb	0.53	1.17	0.31	0.67	0.97	0.87	0.93	0.83
Lu	0.09	0.18	0.06	0.12	0.14	0.14	0.13	0.11
Y	6.02	12.20	2.01	4.92	8.56	7.15	8.86	7.85
ΣREE	143.62	135.49	37.54	90.23	86.23	97.87	103.46	87.13
LREE/HREE	21.37	13.06	12.40	16.45	10.15	14.53	14.37	14.05
La_N/Yb_N	47.82	14.87	15.75	22.19	13.15	16.62	18.51	15.64
δEu	0.76	0.85	1.26	0.89	0.82	0.85	0.75	0.83

元素	奥长花岗岩	二长花岗岩					奥长花岗岩	英云闪长岩
元素	GS03	GS01	GS02	GS04	GS05	GS06	XD	WY
SiO₂	71.99	66.88	74.14	70.20	71.27	71.94	71.76	71.45
TiO₂	0.34	0.48	0.20	0.38	0.33	0.22	0.26	0.22
Al₂O₃	13.31	15.33	12.61	13.73	13.24	13.66	14.22	14.56
Fe₂O₃	2.26	2.37	0.95	2.18	1.89	1.24	1.20	1.33
FeO	1.14	0.18	0.30	1.10	1.32	1.20	1.47	1.26
MnO₂	0.09	0.04	0.04	0.07	0.09	0.02	0.07	0.14
MgO	0.54	1.22	0.70	1.16	0.83	0.50	0.58	0.40
CaO	1.33	0.81	0.92	1.53	1.53	0.75	1.73	1.67
Na₂O	4.09	3.15	3.37	3.54	3.29	3.25	4.14	3.90
K₂O	2.06	5.36	4.01	3.76	4.70	4.77	2.72	3.29
P₂O₅	0.13	0.15	0.04	0.14	0.15	0.04	0.07	0.08
LOI	1.66	2.11	1.10	1.75	1.60	1.27	1.56	1.46
DI	86.15	86.74	90.99	84.65	86.63	90.01	84.87	85.62
SI	5.35	9.93	7.50	9.88	6.90	4.56	5.74	3.93
A/NK	1.49	1.40	1.28	1.39	1.26	1.30	1.46	1.46
A/KNC	1.20	1.27	1.10	1.11	1.03	1.16	1.12	1.14
σ	1.29	2.95	1.73	1.94	2.24	2.20	1.62	1.80
Mg^#	23.27	48.46	51.93	40.31	32.88	28.79	28.85	22.49
Rb	67.00	183.00	124.00	148.00	155.00	170.00	-	-
K	17101.00	44495.00	33288.00	31213.00	39016.00	39597.00	22579.54	27311.28
Ba	419.26	1159.28	683.76	598.05	808.56	858.02	603.00	635.00
Th	14.42	15.88	33.11	9.33	11.10	14.98	7.37	7.29
U	0.94	1.29	1.54	1.58	1.86	2.08	0.57	0.90
Nb	4.17	13.50	2.83	6.97	8.70	7.17	7.17	6.75
Sr	137.01	297.50	249.44	255.51	249.46	308.30	271.00	245.00
P	567.00	655.00	192.00	602.00	672.00	192.00	305.52	349.17
Ta	0.24	2.23	0.10	0.78	1.36	0.96	0.69	0.72
Ti	2058.00	2879.00	1175.00	2294.00	1971.00	1306.00	1558.70	1318.90
Cr	29.60	14.90	14.50	19.60	20.00	10.80	-	-
Ni	12.4	18.70	7.71	5.42	7.42	4.22	-	-
Sr/Y	22.76	24.33	123.81	51.96	29.16	43.10	30.59	31.21
Nb/Ta	17.57	6.05	27.05	8.94	6.41	7.48	10.39	9.38
Th/Ta	60.80	7.10	316.60	12.00	8.20	15.60	10.68	10.13
Nd/Th	1.75	1.55	0.19	1.77	1.59	1.04	2.46	2.02
La	35.10	24.20	6.85	20.80	17.80	20.20	24.00	18.10
Ce	65.10	65.20	18.10	39.90	34.10	48.00	47.10	42.40
Pr	7.20	6.23	1.78	4.68	4.32	4.43	3.87	2.96
Nd	25.20	24.60	6.310	16.50	17.60	15.60	18.10	14.75
Sm	3.76	4.48	1.24	2.56	3.72	2.66	3.05	2.55
Eu	0.84	1.10	0.47	0.66	0.86	0.67	0.61	0.58
Gd	3.01	3.52	1.05	2.01	2.76	2.18	2.05	1.78
Tb	0.36	0.50	0.16	0.27	0.41	0.31	0.31	0.24
Dy	1.43	2.37	0.72	1.16	1.91	1.55	1.84	1.59
Ho	0.24	0.46	0.11	0.21	0.40	0.29	0.34	0.27
Er	0.63	1.22	0.30	0.60	0.96	0.80	0.98	0.83
Tm	0.12	0.21	0.09	0.13	0.18	0.16	0.15	0.14
Yb	0.53	1.17	0.31	0.67	0.97	0.87	0.93	0.83
Lu	0.09	0.18	0.06	0.12	0.14	0.14	0.13	0.11
Y	6.02	12.20	2.01	4.92	8.56	7.15	8.86	7.85
ΣREE	143.62	135.49	37.54	90.23	86.23	97.87	103.46	87.13
LREE/HREE	21.37	13.06	12.40	16.45	10.15	14.53	14.37	14.05
La_N/Yb_N	47.82	14.87	15.75	22.19	13.15	16.62	18.51	15.64
δEu	0.76	0.85	1.26	0.89	0.82	0.85	0.75	0.83