海南岛西部抱板杂岩中伟晶岩矿物学与全岩地球化学特征及成因意义

doi:10.19657/j.geoscience.1000-8527.2025.022

摘要/Abstract

摘要：

海南岛西部抱板杂岩中广泛发育伟晶岩,但伟晶岩地球化学研究尚未开展,伟晶岩类型、成因及其稀有金属成矿潜力尚不清楚。本文在野外调查和岩石薄片显微观察的基础上,对抱板杂岩中伟晶岩样品开展全岩、单矿物(云母、长石)的主量元素、微量元素和稀土元素分析和长石X射线粉晶衍射分析。划分伟晶岩类型,探讨伟晶岩成因,分析伟晶岩成矿潜力。抱板杂岩中伟晶岩属于白云母钠长石型伟晶岩,具有高硅铝,低钙镁及过铝质等特征;微量元素总体相对富集大离子亲石元素,相对亏损高场强元素;轻稀土元素相对富集,重稀土元素相对亏损。电子探针分析表明伟晶岩中云母主要为白云母,长石主要为钠长石、次为更长石、微斜长石。伟晶岩演化程度低,类型上属于白云母-稀有金属伟晶岩-REE亚类中的褐帘石-独居石子类。伟晶岩全岩和单矿物中的稀有金属含量低,微斜长石晶胞体积小于富铷伟晶岩,不具备形成稀有金属伟晶岩的潜力。

关键词: 花岗伟晶岩, 地球化学, 抱板杂岩, 海南岛

Abstract:

In western Hainan Island, pegmatites were widely distributed in the Baoban Complex. The geochemical research of pegmatites has not been carried out, and the types, genesis and rare metal metallogenic potential are still unclear. Based on field geological characteristics and microscopic observations, major elements, trace elements and rare earth elements of whole rock and single minerals (mica,feldspar) and feldspar X-ray powder diffraction were carried out on pegmatites in the Baoban complex. The type of pegmatites is classified, the metallogenic potential of pegmatites is analyzed, and its genetic relationship between pegmatites and adjacent granites are discussed. The pegmatites belong to the muscovite albite pegmatite, which have high silicon and aluminum content, low calcium and magnesium content and peraluminous. Trace elements are generally enriched in large ion lithophile elements, and depleted in high field strength elements. Light rare earth elements are relatively enriched, while heavy rare earth elements are relatively depleted. Electron Probe Micro-Analysis shows that the mica in the pegmatites is mainly muscovite, and the feldspar is mainly albite, the second oligoclase and microcline. The pegmatites have a low degree of evolution. The pegmatites are classified as the allanite-monazite type of muscovite-rare-element-REE(REL-REE)subclass. The content of rare metals in pegmatites is low, and the cell volume of microcline is smaller than that of rubidium-rich pegmatite. The pegmatites do not have rare metal mineralization potential.

Key words: granite pegmatite, geochemistry, Baoban Complex, Hainan Island

中图分类号:

P595

恽虎, 官军, 王成, 林世莉, 费光春. 海南岛西部抱板杂岩中伟晶岩矿物学与全岩地球化学特征及成因意义[J]. 现代地质, 2025, 39(03): 715-727.

YUN Hu, GUAN Jun, WANG Cheng, LIN Shili, FEI Guangchun. Mineralogy and Whole Rock Geochemical Characteristics and Genetic Implications of Pegmatites in the Baoban Complex, Western Hainan Island[J]. Geoscience, 2025, 39(03): 715-727.

图/表 18

参考文献 61

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编号	HPGZ-9	HPGZ-10	HPGZ-11	HPGZ-20	HPGZ-21	HPEW-23	HPEW-24	HPEW-25
	戈枕村组中伟晶岩			片麻状花岗岩中伟晶岩		峨文岭组中伟晶岩
SiO₂	74.55	73.20	75.08	73.94	73.07	73.57	74.67	72.67
TiO₂	0.01	0.02	0.01	0.02	0.01	0.04	0.01	0.02
Al₂O₃	14.39	15.72	13.76	14.7	14.92	14.81	14.17	15.9
TFe₂O₃	0.37	0.71	0.41	0.74	0.75	0.50	0.40	0.73
MnO	0.05	0.03	0.01	0.02	0.04	0.03	0.02	0.08
MgO	0.11	0.09	0.09	0.07	0.07	0.12	0.10	0.14
CaO	0.59	1.12	0.48	0.89	0.66	0.76	0.92	0.51
Na₂O	3.80	6.21	3.83	4.91	4.41	4.35	3.74	4.96
K₂O	5.04	1.94	5.44	3.73	5.18	4.92	4.93	3.92
P₂O₅	0.02	0.02	0.02	0.02	0.02	0.02	0.01	0.02
LOI	0.95	0.89	0.79	0.90	0.80	0.78	0.89	0.98
Total	99.89	99.94	99.91	99.93	99.93	99.88	99.85	99.92

编号	HPGZ-9	HPGZ-10	HPGZ-11	HPGZ-20	HPGZ-21	HPEW-23	HPEW-24	HPEW-25
	戈枕村组中伟晶岩			片麻状花岗岩中伟晶岩		峨文岭组中伟晶岩
SiO₂	74.55	73.20	75.08	73.94	73.07	73.57	74.67	72.67
TiO₂	0.01	0.02	0.01	0.02	0.01	0.04	0.01	0.02
Al₂O₃	14.39	15.72	13.76	14.7	14.92	14.81	14.17	15.9
TFe₂O₃	0.37	0.71	0.41	0.74	0.75	0.50	0.40	0.73
MnO	0.05	0.03	0.01	0.02	0.04	0.03	0.02	0.08
MgO	0.11	0.09	0.09	0.07	0.07	0.12	0.10	0.14
CaO	0.59	1.12	0.48	0.89	0.66	0.76	0.92	0.51
Na₂O	3.80	6.21	3.83	4.91	4.41	4.35	3.74	4.96
K₂O	5.04	1.94	5.44	3.73	5.18	4.92	4.93	3.92
P₂O₅	0.02	0.02	0.02	0.02	0.02	0.02	0.01	0.02
LOI	0.95	0.89	0.79	0.90	0.80	0.78	0.89	0.98
Total	99.89	99.94	99.91	99.93	99.93	99.88	99.85	99.92

样品编号	HPGZ-9	HPGZ-10	HPGZ-11	HPGZ-20	HPGZ-21	HPEW-23	HPEW-24	HPEW-25
	戈枕村组中伟晶岩			片麻状花岗岩中伟晶岩		峨文岭组中伟晶岩
Li	4.91	11.2	4.00	9.23	6.93	4.95	3.36	5.02
Be	4.13	3.77	2.47	3.03	2.80	3.69	3.95	7.03
Cs	5.07	3.12	4.98	3.68	4.81	2.80	4.18	3.67
Sn	0.67	2.70	1.16	2.96	2.67	0.88	0.71	4.59
Rb	195.00	87.20	220.00	167.00	234.00	144.00	141.00	132.00
Ba	508.00	48.40	299.00	173.00	95.40	480.00	878.00	225.00
Th	2.30	3.97	1.67	3.11	1.66	2.78	0.22	7.14
U	1.66	4.83	2.21	3.15	1.95	1.73	0.29	2.24
Ta	0.40	0.79	3.17	0.88	0.62	1.22	0.09	0.62
Nb	1.95	8.41	17.90	9.00	6.31	6.35	0.58	5.92
Sr	96.90	83.90	77.70	105.00	67.60	198.00	239.00	121.00
Zr	25.00	111.00	36.30	31.70	23.00	44.40	4.91	20.10
Hf	1.71	5.26	2.09	1.31	1.07	2.01	0.17	0.88
Y	36.50	29.70	10.80	18.80	29.30	15.50	2.12	38.10
La	8.19	3.80	2.69	8.50	10.60	6.90	1.79	14.80
Ce	7.55	5.92	4.11	9.76	12.10	12.50	2.94	29.40
Pr	1.89	0.84	0.72	1.84	2.99	1.59	0.34	3.85
Nd	7.54	3.46	3.06	7.60	12.20	6.17	1.28	15.30
Sm	2.47	1.10	1.05	2.08	3.70	1.37	0.28	3.60
Eu	0.28	0.17	0.18	0.24	0.13	0.47	1.17	0.40
Tb	0.73	0.49	0.30	0.47	0.76	0.33	0.06	0.72
Gd	3.40	2.06	1.43	2.63	4.06	1.62	0.32	3.70
Dy	5.16	3.68	2.21	2.92	4.93	2.24	0.36	5.51
Ho	1.21	0.93	0.45	0.64	1.08	0.54	0.08	1.38
Er	3.84	3.11	1.32	1.93	3.32	1.81	0.22	4.96
Tm	0.71	0.55	0.22	0.32	0.61	0.33	0.04	1.05
Yb	4.85	3.83	1.33	2.00	4.26	2.32	0.23	8.07
Lu	0.76	0.62	0.19	0.33	0.69	0.38	0.04	1.32

样品编号	HPGZ-9	HPGZ-10	HPGZ-11	HPGZ-20	HPGZ-21	HPEW-23	HPEW-24	HPEW-25
	戈枕村组中伟晶岩			片麻状花岗岩中伟晶岩		峨文岭组中伟晶岩
Li	4.91	11.2	4.00	9.23	6.93	4.95	3.36	5.02
Be	4.13	3.77	2.47	3.03	2.80	3.69	3.95	7.03
Cs	5.07	3.12	4.98	3.68	4.81	2.80	4.18	3.67
Sn	0.67	2.70	1.16	2.96	2.67	0.88	0.71	4.59
Rb	195.00	87.20	220.00	167.00	234.00	144.00	141.00	132.00
Ba	508.00	48.40	299.00	173.00	95.40	480.00	878.00	225.00
Th	2.30	3.97	1.67	3.11	1.66	2.78	0.22	7.14
U	1.66	4.83	2.21	3.15	1.95	1.73	0.29	2.24
Ta	0.40	0.79	3.17	0.88	0.62	1.22	0.09	0.62
Nb	1.95	8.41	17.90	9.00	6.31	6.35	0.58	5.92
Sr	96.90	83.90	77.70	105.00	67.60	198.00	239.00	121.00
Zr	25.00	111.00	36.30	31.70	23.00	44.40	4.91	20.10
Hf	1.71	5.26	2.09	1.31	1.07	2.01	0.17	0.88
Y	36.50	29.70	10.80	18.80	29.30	15.50	2.12	38.10
La	8.19	3.80	2.69	8.50	10.60	6.90	1.79	14.80
Ce	7.55	5.92	4.11	9.76	12.10	12.50	2.94	29.40
Pr	1.89	0.84	0.72	1.84	2.99	1.59	0.34	3.85
Nd	7.54	3.46	3.06	7.60	12.20	6.17	1.28	15.30
Sm	2.47	1.10	1.05	2.08	3.70	1.37	0.28	3.60
Eu	0.28	0.17	0.18	0.24	0.13	0.47	1.17	0.40
Tb	0.73	0.49	0.30	0.47	0.76	0.33	0.06	0.72
Gd	3.40	2.06	1.43	2.63	4.06	1.62	0.32	3.70
Dy	5.16	3.68	2.21	2.92	4.93	2.24	0.36	5.51
Ho	1.21	0.93	0.45	0.64	1.08	0.54	0.08	1.38
Er	3.84	3.11	1.32	1.93	3.32	1.81	0.22	4.96
Tm	0.71	0.55	0.22	0.32	0.61	0.33	0.04	1.05
Yb	4.85	3.83	1.33	2.00	4.26	2.32	0.23	8.07
Lu	0.76	0.62	0.19	0.33	0.69	0.38	0.04	1.32

样品编号	HPGZ-10	HPGZ-11	HPGZ-21	HPEW-25
SiO₂	48.02	46.49	47.07	46.80	46.77
Al₂O₃	34.66	34.50	35.69	34.80	35.00
FeO^T	3.03	2.41	1.95	1.35	1.50
MnO	0.02	0.02	-	0.01	0.01
MgO	0.41	0.41	0.25	0.56	0.75
CaO	0.02	-	0.01	0.01	0.06
Na₂O	0.60	0.58	0.45	0.34	0.37
K₂O	10.41	10.36	11.00	10.65	10.58
TiO₂	-	0.07	0.08	0.36	0.33
F	0.22	0.06	0.18	0.09	0.14
Li₂O^*	0.05	0.01	0.04	0.02	0.03
H₂O^*	4.47	4.44	4.47	4.45	4.45
总量	101.86	99.34	101.14	99.43	100.00
以22个氧为基础计算(apfu)
Si	6.291	6.239	6.202	6.245	6.212
Al^IV	1.709	1.761	1.798	1.755	1.788
Total(T)	8.000	8.000	8.000	8.000	8.000
Al^VI	3.645	3.697	3.745	3.719	3.691
Fe	0.332	0.270	0.214	0.151	0.167
Mn	0.003	0.002	0.000	0.002	0.000
Mg	0.079	0.082	0.050	0.111	0.149
Ti	0.000	0.007	0.008	0.036	0.033
Li^*	0.027	0.005	0.021	0.008	0.016
Total(Y)	4.086	4.064	4.039	4.027	4.057
Ca	0.003	0.001	0.001	0.001	0.009
Na	0.153	0.151	0.116	0.087	0.095
K	1.740	1.774	1.849	1.813	1.793
Total(X)	1.896	1.927	1.966	1.901	1.897
F	0.090	0.026	0.074	0.037	0.060
OH^*	3.910	3.974	3.926	3.963	3.940
Total(A)	4.000	4.000	4.000	4.000	4.000