Characteristics and Geological Significance of Alkaline Melano-minerals in Maojiatun Granite, Heilongjiang Province

doi:10.19657/j.geoscience.1000-8527.2019.02.03

Abstract

Abstract:

Existence of alkaline melano-minerals is of great indicative significance for magmatic evolution processes. The Maojiatun alkaline granite body is located at the southern part of the Little Xing’an range-Zhangguangcai range, which represents the eastern part of the Xingmeng orogenic belt. The intrusion is characterized by the presence of alkaline melano-minerals with high contents of alkali and iron. In this study, we analyzed the mineralogical and EPMA chemical characteristics of the alkaline melano-minerals in the Maojiatun granite. Our study shows that the amphibole is iron magnesium-alumina natrium amphibole, and is featured by being Si, Na and Fe rich, and Ca, Mg and Al poor. The pyroxene is aegirine-augite, which is characterized by having high Si, Na and Fe, and low Ti, Mg, Al and Mn. We have determined that the host rock is alkaline magmatite, and the genetic type is aluminum-type A granite. Maojiatun alkaline granite has low M value, which indicates that it may have come from the remelting of juvenile crust. During crystallization, the magma system may have been under a closed and reducing condition, and there is a distinct zonation of acid and basic rocks from the center to margin of the intrusion. We concluded that the Maojiatun alkaline granite was formed in a late orogenic transition setting.

Key words: Maojiatun in Heilongjiang Province, alkaline dark mineral, genesis, post-orogenic extension, alkaline granite

CLC Number:

P588.1

QIN Jinhua, LIU Cui, DENG Jinfu, DUAN Peixin, GUO Na. Characteristics and Geological Significance of Alkaline Melano-minerals in Maojiatun Granite, Heilongjiang Province[J]. Geoscience, 2019, 33(02): 271-283.

Figures/Tables 15

References 38

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测试点号	w_B/%									T占位				C占位
测试点号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	Si	^ⅣAl	Ti	总计	^ⅥAl	Ti
MJT1-1	49.00	1.39	0.51	34.35	1.04	0.06	1.12	7.58	1.95	7.64	0.09	0.16	7.89	0	0
MJT1-2	48.71	1.28	0.56	34.32	1.17	0.01	1.11	7.76	2.15	7.59	0.10	0.15	7.84	0	0
MJT1-3	49.82	1.33	0.41	33.72	1.08	0.13	0.84	7.74	2.21	7.74	0.08	0.16	7.97	0	0
MJT1-4	48.87	1.45	0.42	34.22	1.23	-	1.09	7.73	2.01	7.61	0.08	0.17	7.86	0	0
MJT2-1	48.79	1.34	0.45	34.84	1.28	0.01	1.21	7.77	1.86	7.55	0.08	0.16	7.79	0	0
MJT2-2	48.87	1.27	0.40	34.42	1.16	0.11	1.11	7.80	2.20	7.59	0.07	0.15	7.81	0	0
MJT3-1	51.15	0.71	1.41	35.36	0.70	0.01	0.30	7.04	1.18	7.87	0.13	0	8.00	0.13	0.08
MJT3-2	48.66	0.70	1.42	36.05	1.01	0.13	0.32	8.08	1.22	7.44	0.26	0.08	7.78	0	0
MJT6-1	49.37	1.26	1.13	35.15	1.13	0.07	0.68	7.25	1.46	7.64	0.21	0.15	8.00	0	0
MJT6-2	49.74	1.30	0.91	34.46	1.27	0.14	0.36	7.69	1.47	7.68	0.17	0.15	7.99	0	0
MJT12-3	48.06	0.96	1.36	35.74	1.18	0.19	1.24	7.34	1.28	7.42	0.25	0.11	7.78	0	0
MJT13-1	48.63	1.14	1.20	34.42	1.14	0.24	2.00	7.63	1.35	7.45	0.22	0.13	7.80	0	0
MJT13-2	48.18	1.24	1.22	35.00	1.05	0.28	1.87	7.72	1.38	7.37	0.22	0.14	7.73	0	0
MJT13-3	49.78	0.93	1.27	34.82	0.84	0.27	1.29	7.11	1.30	7.67	0.23	0.10	8.00	0	0.01
测试点号	C占位					B占位						A占位			占位总量
测试点号	Fe³⁺	Mg	Fe²⁺	Mn	总计	Mg	Fe²⁺	Mn	Ca	Na	总计	Na	K	总计	占位总量
MJT1-1	0	0.01	4.48	0.14	4.63	0	0	0	0.19	1.81	2	0.48	0.39	0.87	15.39
MJT1-2	0	0	4.47	0.15	4.63	0	0	0	0.19	1.81	2	0.53	0.43	0.96	15.43
MJT1-3	0	0.03	4.38	0.14	4.55	0	0	0	0.14	1.86	2	0.47	0.44	0.91	15.44
MJT1-4	0	0	4.46	0.16	4.62	0	0	0	0.18	1.82	2	0.52	0.40	0.92	15.40
MJT2-1	0	0	4.51	0.17	4.68	0	0	0	0.20	1.80	2	0.53	0.37	0.90	15.37
MJT2-2	0	0.03	4.47	0.15	4.65	0	0	0	0.18	1.82	2	0.53	0.44	0.97	15.44
MJT3-1	0	0	4.55	0.09	4.85	0	0	0	0.05	1.95	2	0.15	0.23	0.38	15.23
MJT3-2	0	0.03	4.61	0.13	4.77	0	0	0	0.05	1.95	2	0.45	0.24	0.69	15.24
MJT6-1	0	0.02	4.55	0.15	4.72	0	0	0	0.11	1.89	2	0.29	0.29	0.58	15.29
MJT6-2	0	0.03	4.45	0.17	4.65	0	0	0	0.06	1.94	2	0.36	0.29	0.65	15.29
MJT12-3	0	0.04	4.62	0.15	4.81	0	0	0	0.21	1.79	2	0.40	0.25	0.66	15.25
MJT13-1	0	0.05	4.41	0.15	4.61	0	0	0	0.33	1.67	2	0.59	0.26	0.86	15.26
MJT13-2	0	0.06	4.48	0.14	4.68	0	0	0	0.31	1.69	2	0.60	0.27	0.86	15.27
MJT13-3	0	0.06	4.49	0.11	4.66	0	0	0	0.21	1.79	2	0.34	0.26	0.59	15.26

测试点号	w_B/%									T占位				C占位
测试点号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	Si	^ⅣAl	Ti	总计	^ⅥAl	Ti
MJT1-1	49.00	1.39	0.51	34.35	1.04	0.06	1.12	7.58	1.95	7.64	0.09	0.16	7.89	0	0
MJT1-2	48.71	1.28	0.56	34.32	1.17	0.01	1.11	7.76	2.15	7.59	0.10	0.15	7.84	0	0
MJT1-3	49.82	1.33	0.41	33.72	1.08	0.13	0.84	7.74	2.21	7.74	0.08	0.16	7.97	0	0
MJT1-4	48.87	1.45	0.42	34.22	1.23	-	1.09	7.73	2.01	7.61	0.08	0.17	7.86	0	0
MJT2-1	48.79	1.34	0.45	34.84	1.28	0.01	1.21	7.77	1.86	7.55	0.08	0.16	7.79	0	0
MJT2-2	48.87	1.27	0.40	34.42	1.16	0.11	1.11	7.80	2.20	7.59	0.07	0.15	7.81	0	0
MJT3-1	51.15	0.71	1.41	35.36	0.70	0.01	0.30	7.04	1.18	7.87	0.13	0	8.00	0.13	0.08
MJT3-2	48.66	0.70	1.42	36.05	1.01	0.13	0.32	8.08	1.22	7.44	0.26	0.08	7.78	0	0
MJT6-1	49.37	1.26	1.13	35.15	1.13	0.07	0.68	7.25	1.46	7.64	0.21	0.15	8.00	0	0
MJT6-2	49.74	1.30	0.91	34.46	1.27	0.14	0.36	7.69	1.47	7.68	0.17	0.15	7.99	0	0
MJT12-3	48.06	0.96	1.36	35.74	1.18	0.19	1.24	7.34	1.28	7.42	0.25	0.11	7.78	0	0
MJT13-1	48.63	1.14	1.20	34.42	1.14	0.24	2.00	7.63	1.35	7.45	0.22	0.13	7.80	0	0
MJT13-2	48.18	1.24	1.22	35.00	1.05	0.28	1.87	7.72	1.38	7.37	0.22	0.14	7.73	0	0
MJT13-3	49.78	0.93	1.27	34.82	0.84	0.27	1.29	7.11	1.30	7.67	0.23	0.10	8.00	0	0.01
测试点号	C占位					B占位						A占位			占位总量
测试点号	Fe³⁺	Mg	Fe²⁺	Mn	总计	Mg	Fe²⁺	Mn	Ca	Na	总计	Na	K	总计	占位总量
MJT1-1	0	0.01	4.48	0.14	4.63	0	0	0	0.19	1.81	2	0.48	0.39	0.87	15.39
MJT1-2	0	0	4.47	0.15	4.63	0	0	0	0.19	1.81	2	0.53	0.43	0.96	15.43
MJT1-3	0	0.03	4.38	0.14	4.55	0	0	0	0.14	1.86	2	0.47	0.44	0.91	15.44
MJT1-4	0	0	4.46	0.16	4.62	0	0	0	0.18	1.82	2	0.52	0.40	0.92	15.40
MJT2-1	0	0	4.51	0.17	4.68	0	0	0	0.20	1.80	2	0.53	0.37	0.90	15.37
MJT2-2	0	0.03	4.47	0.15	4.65	0	0	0	0.18	1.82	2	0.53	0.44	0.97	15.44
MJT3-1	0	0	4.55	0.09	4.85	0	0	0	0.05	1.95	2	0.15	0.23	0.38	15.23
MJT3-2	0	0.03	4.61	0.13	4.77	0	0	0	0.05	1.95	2	0.45	0.24	0.69	15.24
MJT6-1	0	0.02	4.55	0.15	4.72	0	0	0	0.11	1.89	2	0.29	0.29	0.58	15.29
MJT6-2	0	0.03	4.45	0.17	4.65	0	0	0	0.06	1.94	2	0.36	0.29	0.65	15.29
MJT12-3	0	0.04	4.62	0.15	4.81	0	0	0	0.21	1.79	2	0.40	0.25	0.66	15.25
MJT13-1	0	0.05	4.41	0.15	4.61	0	0	0	0.33	1.67	2	0.59	0.26	0.86	15.26
MJT13-2	0	0.06	4.48	0.14	4.68	0	0	0	0.31	1.69	2	0.60	0.27	0.86	15.27
MJT13-3	0	0.06	4.49	0.11	4.66	0	0	0	0.21	1.79	2	0.34	0.26	0.59	15.26

样品编号	SiO₂	TiO₂	Al₂O₃	Cr₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	总量	Si	^ⅥAl
MJT12-1	52.48	0.29	0.35	0.57	0	29.88	0.42	0.01	3.64	12.19	0.01	99.84	2.13	0.01
MJT12-2	52.06	0.25	0.22	0.07	0	30.36	0.33	0.07	3.14	12.66	0.02	99.18	2.13	0.01
样品编号	Ti	Cr	Fe³⁺	Fe²⁺	Mn	Mg	Ca	Na	Li	阳离子总量	Wo	En	Fs	Ac
MJT12-1	0.01	0.02	0.83	0.17	0.01	0	0.15	0.95	0	3.54	0.05	13.48	86.46	41.05
MJT12-2	0.01	0	0.91	0.12	0.01	0	0.14	1.01	0	3.54	0.36	11.64	87.99	43.14

样品编号	SiO₂	TiO₂	Al₂O₃	Cr₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	总量	Si	^ⅥAl
MJT12-1	52.48	0.29	0.35	0.57	0	29.88	0.42	0.01	3.64	12.19	0.01	99.84	2.13	0.01
MJT12-2	52.06	0.25	0.22	0.07	0	30.36	0.33	0.07	3.14	12.66	0.02	99.18	2.13	0.01
样品编号	Ti	Cr	Fe³⁺	Fe²⁺	Mn	Mg	Ca	Na	Li	阳离子总量	Wo	En	Fs	Ac
MJT12-1	0.01	0.02	0.83	0.17	0.01	0	0.15	0.95	0	3.54	0.05	13.48	86.46	41.05
MJT12-2	0.01	0	0.91	0.12	0.01	0	0.14	1.01	0	3.54	0.36	11.64	87.99	43.14

样品号	MJT1-1	MJT1-2	MJT1-3	MJT1-4	MJT2-2	MJT3-1	MJT3-2
ΔNNO	-4.14	-4.12	-4.04	-3.78	-3.93	-4.08	-3.78
样品号	MJT6-1	MJT6-2	MJT12-3	MJT2-1	MJT13-1	MJT13-2	MJT13-3
ΔNNO	-3.93	-4.08	-4.06	-3.98	-4.00	-4.01	-3.92