Mineralogy and Whole Rock Geochemical Characteristics and Genetic Implications of Pegmatites in the Baoban Complex, Western Hainan Island

doi:10.19657/j.geoscience.1000-8527.2025.022

Abstract

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

CLC Number:

P595

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.

Figures/Tables 18

References 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