冀北五凤楼煌斑岩年代学、地球化学特征及其成因

doi:10.19657/j.geoscience.1000-8527.2018.02.09

摘要/Abstract

摘要：

燕山地区中生代花岗岩类侵入体中发育煌斑岩,呈脉状产于冀北寿王坟—五凤楼一带,岩石类型主要为云煌岩。岩石化学属基性,富钠,富碱,高Mg^#,高钛,属高钛、钠质钙碱性煌斑岩。岩石中富集LREE、Ba等大离子亲石元素和P,亏损HREE和Nb、Zr、Ta等高场强元素,基本无Eu异常。其LA-ICP-MS锆石U-Pb年龄为(135.2±1.3) Ma, 侵位于早白垩世,与寿王坟杂岩体是同一时期岩浆活动的产物。五凤楼煌斑岩锆石ε_Hf(t)值为-19.3~-13.3,模式年龄远老于其成岩年龄,表明岩浆起源于富集地幔。较高的Ba/Th值(123.09~436.34)和Sr值(915.4×10^-6~1 257×10^-6),暗示源区在一定程度上受到了俯冲带流体的改造;较低的Rb/Sr值(0.02~0.11)及较高的Ba/Rb值(10.8~80.9)证明其源区含有角闪石。岩石地球化学特征显示,五凤楼煌斑岩由俯冲的古太平洋壳富钠流体交代形成的石榴石角闪二辉橄榄岩富集地幔的低程度(0.5%~1.5%)部分熔融上侵而成,起源深度为75~100 km。

关键词: 煌斑岩, 年代学, 地球化学, 五凤楼, 冀北

Abstract:

Mesozoic lamprophyres with lithological minette are developed as dykes near Shouwangfen-Wufenglou in Yanshan region, North China Craton. Chemically, the lamprophyres are basic (SiO₂ from 48.25% to 51.47%), have high values of sodium (Na₂O/K₂O values from 1.13 to 2.31), alkali (K₂O+Na₂O values from 6.61% to 7.40%), Mg^# (67.84 to 71.34) and TiO₂(1.31% to 1.65%), belonging to high-Ti, Na-rich calc-alkaline lamprophyres. The rock is enriched in LREE, LILE and P, depleted in HREE and HFSE (Nb, Zr, Ta), and has no Eu anomalies. LA-ICP-MS zircon U-Pb dating got an age of (135.2±1.3)Ma, indicating that the lamprophyres were intruded at the same period of magmatic activity with the nearby granitic complex at Shouwangfen area in the Early Cretaceous. The ε_Hf(t) values of lamprophyres are ranging from -19.3 to -13.3, the two stage Hf model ages are much older than the age of diagenesis, indicating an enriched mantle source. The high values of Ba/Th (123.09 to 436.34) and Sr (915.4×10^-6 to 1 257×10^-6) imply the magma formation was effected by the subduction-zone fluids. The low values of Rb/Sr(0.02 to 0.11) and the high values of Ba/Rb(10.8 to 80.9) showed that the source contained amphibole. It is concluded that the lamprophyres were derived from partial melting (0.5% to 1.5%) of garnet-amphibole lherzolite of enriched mantle that formed by the interaction between sodium rich subduction fluid and mantle wedge, and the origin depth is 75 km to 100 km.

Key words: lamprophyre, chronology, geochemical characteristic, Wufenglou, Northern Hebei

中图分类号:

P588.13
P597

董朋生, 董国臣, 孙转荣, 李华伟, 王树树, 翟天雷, 王伟清, 耿建珍. 冀北五凤楼煌斑岩年代学、地球化学特征及其成因[J]. 现代地质, 2018, 32(02): 305-315.

DONG Pengsheng, DONG Guochen, SUN Zhuanrong, LI Huawei, WANG Shushu, ZHAI Tianlei, WANG Weiqing, GENG Jianzhen. Chronology,Geochemistry Characteristics and Petrogenesis of Wufenglou Lamprophyres in Northern Hebei, China[J]. Geoscience, 2018, 32(02): 305-315.

图/表 13

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样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	Na₂O+ K₂O	Na₂O/ K₂O	Mg^#
16WF88	51.47	1.34	13.75	8.87	5.64	0.14	7.81	8.24	3.71	2.90	0.62	1.25	100.10	6.61	1.28	71.17
16WF93	48.25	1.65	14.12	11.12	6.21	0.16	8.00	7.11	4.83	2.09	1.10	1.68	100.11	6.92	2.31	69.66
16CL94	49.35	1.62	14.00	10.88	5.89	0.14	6.97	6.32	3.93	3.47	1.16	2.26	100.10	7.40	1.13	67.84
16WF301	50.43	1.38	13.76	9.28	5.64	0.14	7.27	7.85	3.78	2.71	0.73	2.51	99.84	6.49	1.39	69.68
16WF303	51.03	1.31	14.00	8.98	4.97	0.13	6.94	7.35	3.92	2.70	0.67	2.86	99.89	6.62	1.45	71.34
样品号	K/Al	K/(K +Na)	Rb	Sr	Nb	Ba	Ta	Pb	Th	U	V	Zr	Hf	Y	La	Ce
16WF88	0.23	0.34	105.7	969	51.6	1 141	2.45	15.10	9.27	2.42	170	235	8.84	17.34	48.8	114
16WF93	0.16	0.22	49.07	915	64.8	1 558	3.65	8.49	5.52	1.35	170	256	8.24	19.06	79.3	163
16CL94	0.27	0.37	25.08	1 167	59.1	2 029	3.31	13.70	4.65	1.46	164	279	9.59	17.39	53.0	133
16WF301	0.21	0.32	84.78	1 230	38.2	1 400	1.04	9.64	4.82	2.55	205	224	9.13	15.34	75.6	158
16WF303	0.21	0.31	78.29	1 257	39.8	1 290	1.30	9.40	6.14	2.44	181	231	8.9	14.19	67.7	142
样品号	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	LREE/ HREE	(La/ Yb)_N	δEu
16WF88	12.5	46.6	8.15	2.56	6.82	0.82	3.98	0.71	1.78	0.23	1.27	0.20	248.26	14.70	27.57	1.02
16WF93	19.0	68.5	10.90	3.28	8.84	0.98	4.52	0.78	1.98	0.25	1.32	0.20	362.76	18.22	43.07	0.99
16CL94	17.1	64.6	10.10	3.08	8.02	0.89	4.10	0.70	1.86	0.22	1.21	0.19	297.86	16.33	31.41	1.01
16WF301	17.4	63.3	9.55	3.09	8.61	0.92	3.96	0.67	1.81	0.23	1.26	0.21	344.46	18.49	43.04	1.02
16WF303	16.2	58.8	8.89	2.88	7.94	0.85	3.71	0.62	1.70	0.21	1.15	0.19	312.99	18.12	42.24	1.03

样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	Na₂O+ K₂O	Na₂O/ K₂O	Mg^#
16WF88	51.47	1.34	13.75	8.87	5.64	0.14	7.81	8.24	3.71	2.90	0.62	1.25	100.10	6.61	1.28	71.17
16WF93	48.25	1.65	14.12	11.12	6.21	0.16	8.00	7.11	4.83	2.09	1.10	1.68	100.11	6.92	2.31	69.66
16CL94	49.35	1.62	14.00	10.88	5.89	0.14	6.97	6.32	3.93	3.47	1.16	2.26	100.10	7.40	1.13	67.84
16WF301	50.43	1.38	13.76	9.28	5.64	0.14	7.27	7.85	3.78	2.71	0.73	2.51	99.84	6.49	1.39	69.68
16WF303	51.03	1.31	14.00	8.98	4.97	0.13	6.94	7.35	3.92	2.70	0.67	2.86	99.89	6.62	1.45	71.34
样品号	K/Al	K/(K +Na)	Rb	Sr	Nb	Ba	Ta	Pb	Th	U	V	Zr	Hf	Y	La	Ce
16WF88	0.23	0.34	105.7	969	51.6	1 141	2.45	15.10	9.27	2.42	170	235	8.84	17.34	48.8	114
16WF93	0.16	0.22	49.07	915	64.8	1 558	3.65	8.49	5.52	1.35	170	256	8.24	19.06	79.3	163
16CL94	0.27	0.37	25.08	1 167	59.1	2 029	3.31	13.70	4.65	1.46	164	279	9.59	17.39	53.0	133
16WF301	0.21	0.32	84.78	1 230	38.2	1 400	1.04	9.64	4.82	2.55	205	224	9.13	15.34	75.6	158
16WF303	0.21	0.31	78.29	1 257	39.8	1 290	1.30	9.40	6.14	2.44	181	231	8.9	14.19	67.7	142
样品号	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	LREE/ HREE	(La/ Yb)_N	δEu
16WF88	12.5	46.6	8.15	2.56	6.82	0.82	3.98	0.71	1.78	0.23	1.27	0.20	248.26	14.70	27.57	1.02
16WF93	19.0	68.5	10.90	3.28	8.84	0.98	4.52	0.78	1.98	0.25	1.32	0.20	362.76	18.22	43.07	0.99
16CL94	17.1	64.6	10.10	3.08	8.02	0.89	4.10	0.70	1.86	0.22	1.21	0.19	297.86	16.33	31.41	1.01
16WF301	17.4	63.3	9.55	3.09	8.61	0.92	3.96	0.67	1.81	0.23	1.26	0.21	344.46	18.49	43.04	1.02
16WF303	16.2	58.8	8.89	2.88	7.94	0.85	3.71	0.62	1.70	0.21	1.15	0.19	312.99	18.12	42.24	1.03

测点	含量/10^-6			Th/U	²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb		年龄/Ma
	含量/10^-6				²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb
	Pb	Th	U		比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ
1	4	150	170	0.88	0.021 6	0.000 3	0.155 4	0.013 9	0.052 1	0.004 5	138	2	147	13	289	199
2	8	306	387	0.79	0.020 6	0.000 3	0.144 2	0.004 7	0.050 9	0.001 6	131	2	137	4	234	73
3	6	160	281	0.57	0.020 6	0.000 4	0.154 7	0.005 8	0.054 6	0.002 3	131	2	146	6	394	93
4	7	220	305	0.72	0.021 8	0.000 5	0.156 2	0.005 4	0.051 9	0.002 0	139	3	147	5	279	88
5	6	167	260	0.64	0.021 2	0.000 4	0.155 1	0.006 0	0.053 0	0.002 3	135	3	146	6	330	97
6	5	126	227	0.56	0.020 5	0.000 5	0.158 6	0.004 8	0.056 2	0.002 0	131	3	149	5	460	80
7	5	138	207	0.67	0.021 7	0.000 4	0.157 1	0.005 6	0.052 5	0.002 1	138	2	148	5	309	90
8	4	163	188	0.87	0.020 8	0.000 3	0.154 8	0.005 7	0.053 9	0.001 9	133	2	146	5	366	77
9	5	172	246	0.70	0.021 1	0.000 4	0.164 3	0.006 9	0.056 5	0.002 4	135	3	155	6	471	92
10	5	147	237	0.62	0.021 0	0.000 4	0.152 4	0.005 4	0.052 7	0.002 3	134	3	144	5	317	101
11	4	188	195	0.96	0.020 7	0.000 3	0.148 9	0.005 4	0.052 1	0.001 9	132	2	141	5	289	83
12	7	328	301	1.09	0.021 7	0.000 3	0.158 5	0.005 3	0.052 9	0.001 8	139	2	149	5	325	78
13	7	338	315	1.07	0.021 3	0.000 3	0.147 8	0.004 6	0.050 2	0.001 6	136	2	140	4	206	75
14	4	171	201	0.85	0.021 5	0.000 3	0.158 6	0.008 8	0.053 6	0.003 8	137	2	149	8	353	160
15	5	164	212	0.77	0.021 3	0.000 3	0.147 6	0.005 8	0.050 1	0.001 9	136	2	140	6	201	89
16	21	106	847	1.25	0.021 4	0.000 3	0.153 8	0.012 2	0.052 2	0.004 1	136	2	145	12	296	178
17	7	297	295	1.01	0.021 5	0.000 6	0.155 7	0.013 3	0.052 6	0.003 4	137	4	147	13	312	147
18	6	288	289	1.00	0.021 1	0.000 3	0.161 5	0.005 0	0.055 6	0.001 9	134	2	152	5	437	75

测点	含量/10^-6			Th/U	²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb		年龄/Ma
	含量/10^-6				²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb
	Pb	Th	U		比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ
1	4	150	170	0.88	0.021 6	0.000 3	0.155 4	0.013 9	0.052 1	0.004 5	138	2	147	13	289	199
2	8	306	387	0.79	0.020 6	0.000 3	0.144 2	0.004 7	0.050 9	0.001 6	131	2	137	4	234	73
3	6	160	281	0.57	0.020 6	0.000 4	0.154 7	0.005 8	0.054 6	0.002 3	131	2	146	6	394	93
4	7	220	305	0.72	0.021 8	0.000 5	0.156 2	0.005 4	0.051 9	0.002 0	139	3	147	5	279	88
5	6	167	260	0.64	0.021 2	0.000 4	0.155 1	0.006 0	0.053 0	0.002 3	135	3	146	6	330	97
6	5	126	227	0.56	0.020 5	0.000 5	0.158 6	0.004 8	0.056 2	0.002 0	131	3	149	5	460	80
7	5	138	207	0.67	0.021 7	0.000 4	0.157 1	0.005 6	0.052 5	0.002 1	138	2	148	5	309	90
8	4	163	188	0.87	0.020 8	0.000 3	0.154 8	0.005 7	0.053 9	0.001 9	133	2	146	5	366	77
9	5	172	246	0.70	0.021 1	0.000 4	0.164 3	0.006 9	0.056 5	0.002 4	135	3	155	6	471	92
10	5	147	237	0.62	0.021 0	0.000 4	0.152 4	0.005 4	0.052 7	0.002 3	134	3	144	5	317	101
11	4	188	195	0.96	0.020 7	0.000 3	0.148 9	0.005 4	0.052 1	0.001 9	132	2	141	5	289	83
12	7	328	301	1.09	0.021 7	0.000 3	0.158 5	0.005 3	0.052 9	0.001 8	139	2	149	5	325	78
13	7	338	315	1.07	0.021 3	0.000 3	0.147 8	0.004 6	0.050 2	0.001 6	136	2	140	4	206	75
14	4	171	201	0.85	0.021 5	0.000 3	0.158 6	0.008 8	0.053 6	0.003 8	137	2	149	8	353	160
15	5	164	212	0.77	0.021 3	0.000 3	0.147 6	0.005 8	0.050 1	0.001 9	136	2	140	6	201	89
16	21	106	847	1.25	0.021 4	0.000 3	0.153 8	0.012 2	0.052 2	0.004 1	136	2	145	12	296	178
17	7	297	295	1.01	0.021 5	0.000 6	0.155 7	0.013 3	0.052 6	0.003 4	137	4	147	13	312	147
18	6	288	289	1.00	0.021 1	0.000 3	0.161 5	0.005 0	0.055 6	0.001 9	134	2	152	5	437	75

测点	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	σ	ε_Hf(t)	t_DM1	t_DM2	f_Lu/Hf
1	138.0	0.020 241	0.000 787	0.282 286	0.000 027	-14.2	1 356	2 096	-0.98
2	131.3	0.015 294	0.000 643	0.282 218	0.000 027	-16.8	1 445	2 251	-0.98
3	131.3	0.013 540	0.000 532	0.282 260	0.000 029	-15.3	1 383	2 156	-0.98
4	139.3	0.020 063	0.000 781	0.282 189	0.000 029	-17.6	1 490	2 311	-0.98
5	135.3	0.017 704	0.000 712	0.282 234	0.000 030	-16.1	1 425	2 213	-0.98
6	130.6	0.029 956	0.001 163	0.282 162	0.000 033	-18.8	1 542	2 377	-0.96
7	138.3	0.013 245	0.000 537	0.282 186	0.000 029	-17.7	1 484	2 316	-0.98
8	132.9	0.012 139	0.000 500	0.282 232	0.000 028	-16.2	1 419	2 216	-0.98
9	134.6	0.011 332	0.000 452	0.282 229	0.000 027	-16.3	1 422	2 223	-0.99
10	133.8	0.013 045	0.000 525	0.282 279	0.000 030	-14.5	1 356	2 112	-0.98
11	132.3	0.017 427	0.000 693	0.282 252	0.000 028	-15.5	1399	2173	-0.98
12	138.6	0.021 485	0.000 856	0.282 201	0.000 028	-17.2	1 476	2 285	-0.97
13	136.1	0.014 080	0.000 586	0.282 206	0.000 032	-17.1	1 459	2 274	-0.98
14	137.0	0.020 528	0.000 830	0.282 207	0.000 032	-17.0	1 466	2 271	-0.97
15	136.2	0.016 448	0.000 694	0.282 164	0.000 028	-18.6	1 521	2 368	-0.98
16	136.2	0.015 820	0.000 665	0.282 313	0.000 026	-13.3	1 314	2 035	-0.98
17	136.9	0.015 545	0.000 636	0.282 142	0.000 027	-19.3	1 549	2 416	-0.98
18	134.3	0.020 981	0.000 851	0.282 285	0.000 035	-14.4	1 360	2 100	-0.97