辽东五龙金矿周缘早白垩世花岗岩体侵位深度及其地质意义

李建锋; 刘建民; 胡国辉; 王伟; 张琪琪; 张拴宏

doi:10.3799/dqkx.2020.324

辽东五龙金矿周缘早白垩世花岗岩体侵位深度及其地质意义

doi: 10.3799/dqkx.2020.324

李建锋^{1, 2, ,},
刘建民^{1, 2},
胡国辉^{1, 2},
王伟³,
张琪琪^{1, 2},
张拴宏^{1, 2}

1.
中国地质科学院地质力学研究所, 北京 100081
2.
自然资源部古地磁与古构造重建重点实验室, 北京 100081
3.
辽宁省有色地质局一〇三队, 辽宁丹东 118008

基金项目:

国家重点研发计划项目 2018YFC0603802

详细信息

作者简介:
李建锋（1977-），男，助理研究员，从事区域大地构造及低温热年代学研究.ORCID：0000-0001-7666-5736. E-mail：lijianfeng216@163.com

中图分类号: P61
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出版历程
- 收稿日期: 2020-09-22
- 刊出日期: 2021-05-15

Emplacement Depth of Early Cretaceous Granitoid Intrusions in Periphery of Wulong Gold Deposit in Liaodong Peninsula and Their Geological Implications

Li Jianfeng^{1, 2
,
,},
Liu Jianmin^{1, 2},
Hu Guohui^{1, 2},
Wang Wei³,
Zhang Qiqi^{1, 2},
Zhang Shuanhong^{1, 2}

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China
3.
103 Brigade of Nonferrous Geological Bureau of Liaoning Province, Dandong 118008, China

摘要

摘要: 早白垩世岩浆活动对辽东半岛五龙地区金矿形成可能具有明显的制约作用，并可能为含金流体提供了热源及动力.五龙金矿南、北早白垩世三股流岩体和五龙背岩体角闪石-斜长石温压计计算结果表明，这2个岩体角闪石结晶温度为640.8~757.4 ℃，对应岩浆的侵位深度为5.9~9.7 km.角闪石TiO₂-Al₂O₃图解表明，三股流和五龙背岩体岩浆源区为壳幔混源.三股流和五龙背岩体侵位深度的差异表明，晚白垩世晚期至早始新世和晚始新世至渐新世五龙地区发生的两期强烈的差异性隆升和剥露过程使五龙岩体、三股流岩体及五龙背岩体在研究区大面积出露，含金矿脉随着区域性隆升到达近地表.考虑到辽东半岛与胶东半岛的相似构造背景，认为五龙地区具有进一步金矿勘探的价值.
- 早白垩世 /
- 五龙金矿 /
- 角闪石-斜长石温压计 /
- 侵位深度 /
- 岩浆源区 /
- 矿床地质
Abstract: Early Cretaceous magmatism in the Liaodong Peninsula is of great significance for the formation of Wulong gold deposit and probably provided the heat source and power for the gold-bearing fluid. Results from geothermobarometry of hornblende-plagioclase applied to the Early Cretaceous Sanguliu and Wulongbei granitoid intrusions,located in the north and south parts of the Wulong area respectively,demonstrate that hornblendes in the Sanguliu and Wulongbei granitoid intrusions crystallized at temperatures from 640.8 to 757.4 ℃ and the emplacement depth of the magma is from 5.9 to 9.7 km. On the TiO₂-Al₂O₃ diagram,samples from the Sanguliu and Wulongbei granitoid intrusions plot in the area of mixed source of crust and mantle. The difference of the emplacement depth between the Sanguliu and Wulongbei granitoid intrusions indicates that the large areas of emergence of the Wulong,Sanguliu and Wulongbei granitoid intrusions were formed by the strong differential exhumation and denudation during the times from late Late Cretaceous to Early Eocene and from Late Eocene to Oligocene. Simultaneously,the gold-bearing veins reached the near surface by regional uplift. The Wulong area is worth further gold exploration considering that the Liaodong Peninsula has the similar tectonic settings with the Jiaodong Peninsula.
- Early Cretaceous /
- Wulong gold deposit /
- hornblende-plagioclase geothermobarometry /
- emplacement depth of pluton /
- magma source /
- mineral deposits

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图 1 五龙金矿及周缘区域地质图

据Duan et al.(2014)修改

Fig. 1. Geological map of the Wulong gold deposit and its surrounding areas

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图 2 五龙地区早白垩世三股流和五龙背岩体典型岩石学特征

a.三股流岩体花岗闪长岩；b.五龙背岩体黑云母二长花岗岩；c.三股流岩体显微特征；d.五龙背岩体显微特征.Pl.斜长石；Hb.角闪石；Bt.黑云母；Kfs.钾长石；Qz.石英

Fig. 2. Petrological characteristics of the Early Cretaceous Sanguliu and Wulongbei plutons in the Wulong area

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图 3 三股流和五龙背岩体角闪石分类图解

据Leake et al.(1997)

Fig. 3. Hornblende classification of the Sanguliu and Wulongbei plutons

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图 4 三股流岩体和五龙背岩体角闪石TiO₂-Al₂O₃ 图解

据龚林等(2018)

Fig. 4. TiO₂-Al₂O₃ diagram of hornblende from the Sanguliu and Wulongbei plutons

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表 1 三股流和五龙背岩体角闪石矿物组成

Table 1. Compositions of hornblende from the Sanguliu and Wulongbei plutons

岩体	三股流
样品号	LD18-11	LD18-11	LD18-11	LD18-11	LD18-11	LD18-11	LD18-12	LD18-12	LD18-12	LD18-12	LD18-13
测点号	1	2	3	4	5	6	1	2	3	4	1
SiO₂	45.58	45.79	45.30	45.76	44.73	46.10	46.03	45.70	49.59	44.49	46.60
TiO₂	1.16	1.24	1.66	1.05	1.45	1.01	0.95	1.13	0.42	1.50	1.33
Al₂O₃	8.18	8.10	8.28	8.13	8.43	7.58	6.30	6.51	4.64	8.02	7.52
FeO*	19.00	18.58	19.02	19.01	19.54	18.49	17.74	17.69	15.57	19.60	19.03
MgO	10.07	10.13	9.57	9.94	9.33	10.40	10.46	10.98	12.54	9.48	9.86
MnO	0.45	0.43	0.41	0.46	0.46	0.46	0.47	0.44	0.47	0.50	0.53
CaO	10.91	11.22	11.50	10.99	10.65	10.99	11.08	11.20	11.83	11.26	11.33
Na₂O	1.38	1.24	1.34	1.24	1.46	1.29	1.49	1.64	0.86	1.88	1.48
K₂O	0.92	0.91	0.98	0.86	0.92	0.90	0.80	0.83	0.49	1.13	0.98
总量	97.64	97.64	98.05	97.45	96.96	97.22	95.33	96.12	96.39	96.93	98.66
	据Holland and Blundy (1994)配位计算（23个氧原子）
Si	6.807	6.835	6.782	6.843	6.756	6.898	7.038	6.935	7.361	6.725	6.920
Al^iv	1.193	1.165	1.218	1.157	1.244	1.102	0.962	1.065	0.639	1.275	1.080
Al^vi	0.247	0.261	0.243	0.277	0.256	0.235	0.174	0.099	0.174	0.155	0.237
Ti	0.131	0.139	0.187	0.119	0.164	0.114	0.109	0.129	0.047	0.171	0.148
Fe³⁺	0.520	0.448	0.341	0.503	0.514	0.489	0.344	0.397	0.299	0.359	0.337
Mg	2.242	2.254	2.135	2.216	2.100	2.320	2.384	2.484	2.773	2.136	2.181
Mn	0.056	0.054	0.052	0.058	0.059	0.058	0.061	0.057	0.059	0.064	0.067
Fe²⁺	1.805	1.844	2.039	1.828	1.906	1.785	1.925	1.834	1.634	2.116	2.026
M4位
Fe	0.049	0.028	0.000	0.047	0.048	0.040	0.000	0.013	0.000	0.002	0.000
Ca	1.746	1.795	1.841	1.761	1.723	1.762	1.813	1.821	1.866	1.823	1.799
Na	0.205	0.177	0.159	0.192	0.229	0.198	0.187	0.165	0.134	0.175	0.201
A位
Na	0.195	0.180	0.231	0.168	0.197	0.176	0.256	0.316	0.115	0.377	0.225
K	0.174	0.173	0.188	0.165	0.177	0.172	0.156	0.160	0.092	0.218	0.186
A位总和	0.370	0.354	0.419	0.332	0.375	0.348	0.412	0.476	0.207	0.595	0.411
总和	15.370	15.354	15.416	15.332	15.375	15.348	15.410	15.476	15.191	15.595	15.407

岩体	三股流							五龙背
样品号	LD18-24	LD18-24	LD18-25	LD18-25	LD18-25	LD18-27	LD18-27	LD18-39	LD18-39	LD18-39
测点号	1	2	1	2	3	1	2	1	2	3
SiO₂	47.50	47.98	44.86	43.96	42.16	48.44	48.77	45.86	47.74	48.69
TiO₂	0.79	0.87	1.66	1.41	0.74	0.66	0.72	1.42	0.59	0.73
Al₂O₃	6.57	6.18	7.75	8.05	7.39	5.23	4.90	6.52	4.83	5.76
FeO*	18.11	18.46	20.36	20.87	21.45	17.69	17.59	21.80	14.45	16.92
MgO	10.84	10.99	9.71	8.53	8.58	11.08	11.29	8.36	12.08	11.81
MnO	0.45	0.38	0.48	0.54	0.59	0.44	0.46	1.35	0.37	0.46
CaO	11.42	11.59	10.99	10.97	11.13	11.35	11.32	10.18	13.91	11.48
Na₂O	1.16	1.29	2.00	2.05	1.65	1.12	1.15	1.93	0.81	1.21
K₂O	0.75	0.74	1.08	1.10	1.04	0.60	0.60	0.73	0.48	0.63
总量	97.58	98.46	98.89	97.48	94.72	96.62	96.79	98.14	95.26	97.69
	据Holland and Blundy (1994)配位计算（23个氧原子）
Si	7.063	7.087	6.713	6.715	6.658	7.254	7.285	6.931	7.147	7.182
Al^iv	0.937	0.913	1.287	1.285	1.342	0.746	0.715	1.069	0.853	0.818
岩体	三股流							五龙背
Al^vi	0.215	0.163	0.079	0.165	0.034	0.177	0.148	0.093	0.000	0.183
Ti	0.088	0.097	0.187	0.162	0.087	0.075	0.080	0.161	0.066	0.081
Fe³⁺	0.400	0.370	0.444	0.371	0.546	0.342	0.341	0.521	0.697	0.369
Mg	2.402	2.419	2.165	1.942	2.020	2.474	2.514	1.883	2.695	2.596
Mn	0.057	0.047	0.061	0.070	0.079	0.056	0.058	0.172	0.047	0.057
Fe²⁺	1.837	1.905	2.064	2.289	2.233	1.873	1.856	2.170	1.113	1.713
M4位
Fe	0.014	0.005	0.040	0.006	0.053	0.000	0.000	0.065	0.000	0.005
Ca	1.820	1.834	1.762	1.795	1.883	1.818	1.809	1.649	1.849	1.814
Na	0.165	0.161	0.198	0.199	0.064	0.182	0.191	0.286	0.151	0.181
A位
Na	0.169	0.209	0.382	0.409	0.442	0.144	0.142	0.278	0.083	0.165
K	0.142	0.139	0.206	0.215	0.209	0.115	0.114	0.140	0.092	0.119
A位总和	0.311	0.348	0.588	0.624	0.651	0.259	0.255	0.419	0.175	0.284
总和	15.311	15.348	15.588	15.624	15.651	15.256	15.252	15.419	14.793	15.284

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表 2 三股流和五龙背岩体斜长石矿物组成

Table 2. Compositions of plagioclase from the Sanguliu and Wulongbei plutons

岩体	三股流
样品号	LD18-11	LD18-11	LD18-11	LD18-11	LD18-11	LD18-11	LD18-12	LD18-12	LD18-12	LD18-12	LD18-13
测点号	1	2	3	4	5	6	1	2	3	4	1
SiO₂	59.31	57.95	58.49	60.13	58.23	58.24	63.98	62.29	63.35	63.79	63.28
TiO₂	0.00	0.04	0.00	0.03	0.10	0.03	0.00	0.00	0.00	0.00	0.00
Al₂O₃	24.84	25.87	25.38	24.63	25.62	24.41	22.56	22.81	22.28	22.36	22.54
FeO*	0.13	0.05	0.08	0.08	0.05	0.11	0.10	0.11	0.00	0.21	0.04
MgO	0.00	0.00	0.00	0.00	0.00	0.04	0.00	0.00	0.00	0.00	0.00
MnO	0.00	0.00	0.03	0.04	0.00	0.01	0.00	0.00	0.03	0.02	0.00
CaO	6.83	8.02	7.90	6.62	7.89	7.14	4.46	4.82	3.82	3.97	4.45
Na₂O	7.81	7.29	7.21	8.06	7.15	7.36	9.34	9.15	9.81	9.84	9.09
K₂O	0.19	0.11	0.13	0.24	0.20	0.15	0.24	0.33	0.14	0.19	0.23
总量	99.11	99.33	99.21	99.84	99.25	97.48	100.69	99.51	99.42	100.37	99.62
按8个氧原子计算离子数
Si	2.671	2.612	2.637	2.687	2.625	2.667	2.813	2.780	2.819	2.816	2.810
Al	1.318	1.374	1.348	1.297	1.361	1.317	1.169	1.200	1.168	1.163	1.179
Ti	0.000	0.001	0.000	0.001	0.003	0.001	0.000	0.000	0.000	0.000	0.000
Fe²⁺	0.005	0.002	0.003	0.003	0.002	0.004	0.004	0.004	0.000	0.008	0.001
Mg	0.000	0.000	0.000	0.000	0.000	0.003	0.000	0.000	0.000	0.000	0.000
Mn	0.000	0.000	0.001	0.002	0.000	0.000	0.000	0.000	0.001	0.001	0.000
Ca	0.330	0.387	0.382	0.317	0.381	0.350	0.210	0.231	0.182	0.188	0.212
Na	0.682	0.637	0.630	0.698	0.625	0.653	0.797	0.792	0.846	0.842	0.782
K	0.011	0.006	0.007	0.014	0.012	0.009	0.013	0.019	0.008	0.011	0.013
总和	5.016	5.021	5.008	5.019	5.010	5.005	5.007	5.025	5.024	5.029	4.998
Ab	66.7	61.8	61.8	67.9	61.4	64.5	78.1	76.0	81.7	80.9	77.7
An	32.3	37.6	37.5	30.8	37.4	34.6	20.6	22.1	17.6	18.0	21.0
Or	1.0	0.6	0.7	1.3	1.1	0.9	1.3	1.8	0.7	1.0	1.3
岩体	三股流							五龙背
样品号	LD18-24	LD18-24	LD18-25	LD18-25	LD18-25	LD18-27	LD18-27	LD18-39	LD18-39	LD18-39
测点号	1	2	1	2	3	1	2	1	2	3
SiO₂	63.42	63.37	64.78	65.45	64.14	63.21	60.78	64.90	64.04	60.15
TiO₂	0.00	0.02	0.00	0.00	0.01	0.07	0.00	0.00	0.00	0.04
Al₂O₃	22.55	22.57	22.07	21.64	21.95	22.77	24.12	21.46	22.95	25.42
FeO*	0.03	0.10	0.15	0.08	0.13	0.09	0.14	0.14	0.07	0.07
MgO	0.00	0.00	0.00	0.01	0.01	0.00	0.03	0.00	0.01	0.01
MnO	0.00	0.01	0.03	0.03	0.00	0.00	0.02	0.00	0.01	0.01
CaO	4.25	4.26	3.33	3.34	3.66	4.58	6.45	2.89	4.31	7.28
Na₂O	9.50	9.62	10.03	9.99	9.94	9.43	8.26	10.25	9.35	7.00
K₂O	0.25	0.14	0.22	0.25	0.22	0.31	0.26	0.41	0.16	0.20
总量	100.01	100.09	100.61	100.80	100.05	100.46	100.06	100.05	100.89	100.18
按8个氧原子计算离子数
Si	2.808	2.805	2.845	2.866	2.837	2.792	2.710	2.866	2.807	2.672
Al	1.177	1.177	1.142	1.117	1.144	1.186	1.267	1.117	1.185	1.331
Ti	0.000	0.001	0.000	0.000	0.000	0.002	0.000	0.000	0.000	0.001
Fe²⁺	0.001	0.004	0.006	0.003	0.005	0.003	0.005	0.005	0.003	0.003
Mg	0.000	0.000	0.000	0.001	0.001	0.000	0.002	0.000	0.001	0.000
Mn	0.000	0.000	0.001	0.001	0.000	0.000	0.001	0.000	0.000	0.000
Ca	0.202	0.202	0.156	0.157	0.173	0.217	0.308	0.137	0.202	0.347
Na	0.816	0.826	0.854	0.848	0.852	0.808	0.714	0.877	0.795	0.603
K	0.014	0.008	0.012	0.014	0.012	0.017	0.015	0.023	0.009	0.011
总和	5.018	5.022	5.017	5.006	5.024	5.025	5.021	5.025	5.002	4.968
Ab	79.1	79.7	83.5	83.2	82.1	77.5	68.9	84.6	79.0	62.8
An	19.6	19.5	15.3	15.4	16.7	20.8	29.7	13.2	20.1	36.1
Or	1.4	0.7	1.2	1.4	1.2	1.7	1.4	2.2	0.9	1.2

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表 3 三股流岩体和五龙背岩体结晶压力和侵位深度

Table 3. Crystallization pressure and emplacement depth of the Sanguliu and Wulongbei plutons

岩体名称	样品号	测点号	Al_tot	T(℃)	P-A & S (10⁵ kPa)	P-J & R (10⁵ kPa)	Dp (km)	样品深度(km)	岩体平均深度(km)
三股流岩体	LD18-11	1	1.440	752.4	2.78	2.73	10.1	11.1	9.7
		2	1.426	729.0	3.12	2.67	11.4
		3	1.461	736.0	3.16	2.82	11.5
		4	1.434	704.8	3.49	2.70	12.7
		5	1.500	757.4	2.94	2.99	10.7
		6	1.337	725.7	2.77	2.29	10.1
	LD18-12	1	1.136	676.3	2.39	1.45	8.7	9.1
		2	1.164	711.8	2.18	1.56	7.9
		3	1.027	653.3	1.99	0.98	7.2
		4	1.430	705.3	3.47	2.69	12.6
	LD18-13	1	1.317	672.0	3.28	2.21	12.0	12.0
	LD18-24	1	1.152	640.8	2.64	1.51	9.6	8.9
	LD18-24	2	1.076	653.8	2.23	1.19	8.1	8.9
	LD18-25	1	1.366	720.5	2.98	2.42	10.8	12.3
		2	1.450	699.5	3.63	2.77	13.2
		3	1.377	682.6	3.47	2.46	12.7
	LD18-27	1	0.924	641.7	1.51	0.55	5.5	4.7
	LD18-27	2	0.863	676.4	1.09	0.29	4.0	4.7
五龙背岩体	LD18-39	1	1.162	692.6	2.37	1.55	8.6	5.9	5.9
		2	0.853	670.5	1.07	0.25	3.9
		3	1.001	710.9	1.45	0.88	5.3
注：P-J & R（±0.5 kbar）=4.23Al^T-3.36 (Johnson and Rutherford, 1989), r²=0.99；P-A & S（±0.6 kbar）=4.76 Al^T-3.01-{[T(℃)-675]/85}×{0.530 Al^T +0.005 294[T(℃)-675]}, r²=0.99.r²为公式相关系数；Al_tot为测点全铝含量；P-A & S为根据Anderson and Smith（1995）计算的压力；P-J & R为根据Johnson and Rutherford(1989)计算的压力；Dp为测点获得的侵位深度.

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辽东五龙金矿周缘早白垩世花岗岩体侵位深度及其地质意义

doi: 10.3799/dqkx.2020.324

作者简介:
李建锋（1977-），男，助理研究员，从事区域大地构造及低温热年代学研究.ORCID：0000-0001-7666-5736. E-mail：lijianfeng216@163.com

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Emplacement Depth of Early Cretaceous Granitoid Intrusions in Periphery of Wulong Gold Deposit in Liaodong Peninsula and Their Geological Implications

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辽东五龙金矿周缘早白垩世花岗岩体侵位深度及其地质意义

doi: 10.3799/dqkx.2020.324

作者简介: 李建锋（1977-），男，助理研究员，从事区域大地构造及低温热年代学研究.ORCID：0000-0001-7666-5736. E-mail：lijianfeng216@163.com

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Emplacement Depth of Early Cretaceous Granitoid Intrusions in Periphery of Wulong Gold Deposit in Liaodong Peninsula and Their Geological Implications

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作者简介:
李建锋（1977-），男，助理研究员，从事区域大地构造及低温热年代学研究.ORCID：0000-0001-7666-5736. E-mail：lijianfeng216@163.com