Formation and Mineralogy of Porphyritic Biotite Hornblende Diorite in Qicun Pluton, Southern Hebei Province

doi:10.19657/j.geoscience.1000-8527.2019.04.05

Abstract

Abstract:

The Qicun pluton is a representative Mesozoic high-Mg diorite complex in the southern Taihang Mountains. It is mainly composed of porphyritic biotite hornblende diorite, hornblende diorite, gabbro-diorite and monzonite. In this study, formation and mineralogy of porphyritic biotite hornblende diorite in Qicun is studied in detail to reveal its petrogenesis and geological significance. We found that the hornblende belongs mainly to magnesiohornblende and magnesiohastingsite, and the biotite is magnesiobiotite. The core of the plagioclase is mainly andesine and labradorite, and the rim is mostly oligoclase. Hornblende thermobarometry shows that the hornblende phenocrysts were formed at 930-970 ℃ and 300-340 MPa, corresponding to crustal depth of ca. 10-15 km, with ${f_{O}}_{2}$ of ΔNNO +0.1 to +2.3 and magma water content of 4.8%-5.5%. Hornblende, associated with biotite that represents the final magma solidification, was formed at 684-760 ℃ and 42-61 MPa, with magma water contents decreased to 3.1%-4.3%, and slightly elevated ${f_{O}}_{2}$(ΔNNO +0.7 to +2.4). Additionally, results of biotite thermometry are in good agreement with those of the hornblende thermobarometry, supporting that the estimation of magma-forming conditions are reliable. Consequently, we suggested that the high-Mg magma in Qichun area with high oxygen fugacity was temporarily stored in the middle crust, and underwent hornblende-dominated fractionation. The volatile-rich magma was then rapidly emplaced and formed the high-Mg diorite and the associated iron skarn deposits.

Key words: Qicun pluton, biotite, amphibole, petrogenesis, mineralogy

CLC Number:

P518

GAO Xinyu, ZHANG Juquan, WANG Yiqi, SUN Tianqi, ZHAO Gaichao, WANG Linxuan, LI Yaqi, XU Cui. Formation and Mineralogy of Porphyritic Biotite Hornblende Diorite in Qicun Pluton, Southern Hebei Province[J]. Geoscience, 2019, 33(04): 738-750.

Figures/Tables 11

Fig.1 Geologic map of the Handan-Xingtai area(modified from Zhang et al.[9])

Fig.2 Geologic map of the Qicun pluton (modified after Deng et al.[19])

Fig.3 Petrographic characteristics of the biotite hornblende diorite of the Qicun Pluton

Table 1 EPMA results of hornblende (%)

成分	SiO₂			TiO₂	Al₂O₃		Cr₂O₃	FeO		MnO	MgO			CaO			Na₂O	K₂O			F			Cl			基于13个阳离子
成分	SiO₂			TiO₂	Al₂O₃		Cr₂O₃	FeO		MnO	MgO			CaO			Na₂O	K₂O			F			Cl			13(Si+Al+Cr+ Ti+Fe+Mg+Mn)					Si			Ti			Al			Cr			Fe			Mn			Mg
ST17-1-2a-4	52.22			0.43	3.27		0	10.88		0.36	16.70			11.89			0.88	0.19			0.04			0.06			13.13					7.48			0.05			0.55			0			1.30			0.04			3.57
ST17-1-2a-16	42.63			2.00	11.19		0	12.44		0.23	13.54			11.41			1.91	1.11			0.32			0.01			13.19					6.29			0.22			1.95			0			1.54			0.03			2.98
ST17-1-2a-17	42.46			1.92	11.42		0.02	12.63		0.21	13.24			11.29			2.10	1.19			0.15			0.03			13.17					6.28			0.21			1.99			0			1.56			0.03			2.92
ST17-1-2a-18	42.59			1.76	11.24		0	12.44		0.18	13.74			11.46			1.95	1.26			0.17			0.02			13.20					6.28			0.20			1.95			0			1.53			0.02			3.02
ST17-1-2a-19	42.25			2.05	11.44		0.02	12.03		0.18	13.48			11.33			1.98	1.14			0.32			0			13.17					6.27			0.23			2.00			0			1.49			0.02			2.98
ST17-1-2a-20	42.02			2.12	11.30		0.08	13.61		0.32	11.97			11.52			2.23	1.05			0.08			0.04			13.09					6.32			0.24			2.00			0.01			1.71			0.04			2.68
ST17-1-2a-21	41.88			2.13	11.23		0.05	14.77		0.38	11.62			11.47			2.05	1.07			0			0.05			13.14					6.28			0.24			1.98			0.01			1.85			0.05			2.60
ST17-2-1a-6	52.64			0.44	2.41		0	10.96		0.37	16.67			11.52			1.02	0.21			0.14			0.02			13.12					7.59			0.05			0.41			0			1.32			0.05			3.58
ST17-2-2a-5	41.96			2.07	11.59		0.01	12.41		0.17	13.50			11.27			1.92	1.19			0.13			0.02			13.21					6.21			0.23			2.02			0			1.54			0.02			2.98
ST17-2-2a-6	42.05			2.10	11.53		0	12.12		0.20	13.51			11.26			2.02	1.19			0.17			0.02			13.19					6.24			0.23			2.01			0			1.50			0.03			2.99
ST17-2-2a-7	41.78			2.21	11.72		0	12.68		0.28	13.11			11.15			2.05	1.15			0.07			0.01			13.20					6.20			0.25			2.05			0			1.57			0.03			2.90
ST17-2-2a-8	41.67			2.06	11.94		0	12.89		0.21	13.08			11.42			2.17	1.23			0.33			0.02			13.18					6.17			0.23			2.08			0			1.60			0.03			2.89
ST17-2-2a-4	49.33			0.59	4.62		0	12.88		0.41	14.65			11.73			1.13	0.35			0.21			0.07			13.12					7.27			0.07			0.80			0			1.59			0.05			3.22
ST17-2-1a-14	41.90			1.97	11.63		0	12.32		0.22	13.46			11.26			1.97	1.21			0.18			0.02			13.21					6.22			0.22			2.03			0			1.53			0.03			2.98
ST17-2-1a-15	42.04			2.04	11.02		0.01	13.82		0.34	12.21			11.75			2.08	1.18			0.35			0.04			13.10					6.31			0.23			1.95			0			1.73			0.04			2.73
ST17-2-1a-16	41.11			2.01	12.04		0	13.02		0.20	13.15			11.49			2.11	1.18			0.06			0.01			13.21					6.11			0.22			2.11			0			1.62			0.03			2.91
ST17-2-1a-17	41.39			2.00	11.80		0	13.05		0.18	12.96			11.43			2.10	1.26			0.22			0.02			13.18					6.17			0.22			2.07			0			1.63			0.02			2.88
成分	基于13个阳离子												特征参数																					物理化学条件
成分	Ca			Na	K		总量	F		Cl			OHcalc			Mg/(Mg+Fe²⁺)			Si^*			AlT			Mg^*			^[6]Al^*			Mn^*			t/℃			p/MPa			深度/km			ΔNNO			lg $f O 2$			H₂O_melt
ST17-1-2a-4	1.83			0.24	0.04		15.10	0.02		0.01	1.97					0.81			8.80			0.55			3.93			-1.63			0.06			707			42			1.6			2.4			-13.6			3.8
ST17-1-2a-16	1.80			0.55	0.21		15.56	0.15		0	1.85					0.77			7.29			1.95			2.98			-1.40			0.18			936			315			11.9			0.9			-10.3			5.0
ST17-1-2a-17	1.79			0.60	0.22		15.62	0.07		0.01	1.92					0.75			7.27			1.99			2.91			-1.42			0.16			940			337			12.7			0.8			-10.4			4.9
ST17-1-2a-18	1.81			0.56	0.24		15.60	0.08		0	1.92					0.78			7.27			1.95			3.04			-1.49			0.21			939			318			12.0			1.0			-10.2			4.5
ST17-1-2a-19	1.80			0.57	0.22		15.59	0.15		0	1.85					0.77			7.24			2.00			2.94			-1.39			0.17			944			341			12.9			0.8			-10.2			5.0
ST17-1-2a-20	1.85			0.65	0.20		15.71	0.04		0.01	1.95					0.66			7.27			2.00			2.58			-1.30			0.05			939			341			12.9			0.2			-10.9			5.5
ST17-1-2a-21	1.84			0.60	0.21		15.64	0		0.01	1.99					0.66			7.31			1.98			2.57			-1.29			0.14			934			333			12.6			0.2			-11.0			5.5
ST17-2-1a-6	1.78			0.28	0.04		15.10	0.06		0.01	1.93					0.80			8.96			0.41			3.95			-1.76			0.10			684			35			1.3			2.5			-14.2			3.1
成分		基于13个阳离子										特征参数																					物理化学条件
成分		Ca	Na			K	总量		F	Cl		OHcalc			Mg/(Mg+Fe²⁺)					Si^*			AlT			Mg^*			^[6]Al^*	Mn^*			t/℃			p/MPa			深度/km			ΔNNO			lg $f O 2$			H₂O_melt
ST17-2-2a-5		1.79	0.55			0.22	15.56		0.06	0.01	1.94				0.79					7.21			2.02			2.97			-1.42	0.23			949			352			13.3			0.9			-10.1			4.9
ST17-2-2a-6		1.79	0.58			0.23	15.60		0.08	0.01	1.92				0.78					7.21			2.01			2.95			-1.43	0.20			948			348			13.1			0.8			-10.2			4.8
ST17-2-2a-7		1.77	0.59			0.22	15.58		0.03	0	1.96				0.77					7.20			2.05			2.87			-1.38	0.21			951			366			13.8			0.7			-10.3			5.1
ST17-2-2a-8		1.81	0.62			0.23	15.67		0.16	0	1.84				0.75					7.14			2.08			2.84			-1.41	0.16			960			385			14.5			0.7			-10.1			4.9
ST17-2-2a-4		1.85	0.32			0.07	15.24		0.10	0.02	1.89				0.74					8.57			0.80			3.55			-1.54	0.04			742			61			2.3			1.8			-13.4			4.3
ST17-2-1a-14		1.79	0.57			0.23	15.59		0.08	0.01	1.91				0.79					7.20			2.03			2.97			-1.42	0.21			950			358			13.5			0.9			-10.1			4.9
ST17-2-1a-15		1.89	0.61			0.23	15.72		0.16	0.01	1.83				0.67					7.28			1.95			2.66			-1.41	0.13			939			317			12.0			0.4			-10.8			4.9
ST17-2-1a-16		1.83	0.61			0.22	15.66		0.03	0	1.97				0.77					7.08			2.11			2.88			-1.40	0.15			969			399			15.1			0.7			-9.9			5.0
ST17-2-1a-17		1.83	0.61			0.24	15.67		0.10	0.01	1.89				0.74					7.14			2.07			2.84			-1.43	0.17			959			379			14.3			0.7			-10.2			4.8

Table 1 EPMA results of hornblende (%)

成分	SiO₂			TiO₂	Al₂O₃		Cr₂O₃	FeO		MnO	MgO			CaO			Na₂O	K₂O			F			Cl			基于13个阳离子
成分	SiO₂			TiO₂	Al₂O₃		Cr₂O₃	FeO		MnO	MgO			CaO			Na₂O	K₂O			F			Cl			13(Si+Al+Cr+ Ti+Fe+Mg+Mn)					Si			Ti			Al			Cr			Fe			Mn			Mg
ST17-1-2a-4	52.22			0.43	3.27		0	10.88		0.36	16.70			11.89			0.88	0.19			0.04			0.06			13.13					7.48			0.05			0.55			0			1.30			0.04			3.57
ST17-1-2a-16	42.63			2.00	11.19		0	12.44		0.23	13.54			11.41			1.91	1.11			0.32			0.01			13.19					6.29			0.22			1.95			0			1.54			0.03			2.98
ST17-1-2a-17	42.46			1.92	11.42		0.02	12.63		0.21	13.24			11.29			2.10	1.19			0.15			0.03			13.17					6.28			0.21			1.99			0			1.56			0.03			2.92
ST17-1-2a-18	42.59			1.76	11.24		0	12.44		0.18	13.74			11.46			1.95	1.26			0.17			0.02			13.20					6.28			0.20			1.95			0			1.53			0.02			3.02
ST17-1-2a-19	42.25			2.05	11.44		0.02	12.03		0.18	13.48			11.33			1.98	1.14			0.32			0			13.17					6.27			0.23			2.00			0			1.49			0.02			2.98
ST17-1-2a-20	42.02			2.12	11.30		0.08	13.61		0.32	11.97			11.52			2.23	1.05			0.08			0.04			13.09					6.32			0.24			2.00			0.01			1.71			0.04			2.68
ST17-1-2a-21	41.88			2.13	11.23		0.05	14.77		0.38	11.62			11.47			2.05	1.07			0			0.05			13.14					6.28			0.24			1.98			0.01			1.85			0.05			2.60
ST17-2-1a-6	52.64			0.44	2.41		0	10.96		0.37	16.67			11.52			1.02	0.21			0.14			0.02			13.12					7.59			0.05			0.41			0			1.32			0.05			3.58
ST17-2-2a-5	41.96			2.07	11.59		0.01	12.41		0.17	13.50			11.27			1.92	1.19			0.13			0.02			13.21					6.21			0.23			2.02			0			1.54			0.02			2.98
ST17-2-2a-6	42.05			2.10	11.53		0	12.12		0.20	13.51			11.26			2.02	1.19			0.17			0.02			13.19					6.24			0.23			2.01			0			1.50			0.03			2.99
ST17-2-2a-7	41.78			2.21	11.72		0	12.68		0.28	13.11			11.15			2.05	1.15			0.07			0.01			13.20					6.20			0.25			2.05			0			1.57			0.03			2.90
ST17-2-2a-8	41.67			2.06	11.94		0	12.89		0.21	13.08			11.42			2.17	1.23			0.33			0.02			13.18					6.17			0.23			2.08			0			1.60			0.03			2.89
ST17-2-2a-4	49.33			0.59	4.62		0	12.88		0.41	14.65			11.73			1.13	0.35			0.21			0.07			13.12					7.27			0.07			0.80			0			1.59			0.05			3.22
ST17-2-1a-14	41.90			1.97	11.63		0	12.32		0.22	13.46			11.26			1.97	1.21			0.18			0.02			13.21					6.22			0.22			2.03			0			1.53			0.03			2.98
ST17-2-1a-15	42.04			2.04	11.02		0.01	13.82		0.34	12.21			11.75			2.08	1.18			0.35			0.04			13.10					6.31			0.23			1.95			0			1.73			0.04			2.73
ST17-2-1a-16	41.11			2.01	12.04		0	13.02		0.20	13.15			11.49			2.11	1.18			0.06			0.01			13.21					6.11			0.22			2.11			0			1.62			0.03			2.91
ST17-2-1a-17	41.39			2.00	11.80		0	13.05		0.18	12.96			11.43			2.10	1.26			0.22			0.02			13.18					6.17			0.22			2.07			0			1.63			0.02			2.88
成分	基于13个阳离子												特征参数																					物理化学条件
成分	Ca			Na	K		总量	F		Cl			OHcalc			Mg/(Mg+Fe²⁺)			Si^*			AlT			Mg^*			^[6]Al^*			Mn^*			t/℃			p/MPa			深度/km			ΔNNO			lg $f O 2$			H₂O_melt
ST17-1-2a-4	1.83			0.24	0.04		15.10	0.02		0.01	1.97					0.81			8.80			0.55			3.93			-1.63			0.06			707			42			1.6			2.4			-13.6			3.8
ST17-1-2a-16	1.80			0.55	0.21		15.56	0.15		0	1.85					0.77			7.29			1.95			2.98			-1.40			0.18			936			315			11.9			0.9			-10.3			5.0
ST17-1-2a-17	1.79			0.60	0.22		15.62	0.07		0.01	1.92					0.75			7.27			1.99			2.91			-1.42			0.16			940			337			12.7			0.8			-10.4			4.9
ST17-1-2a-18	1.81			0.56	0.24		15.60	0.08		0	1.92					0.78			7.27			1.95			3.04			-1.49			0.21			939			318			12.0			1.0			-10.2			4.5
ST17-1-2a-19	1.80			0.57	0.22		15.59	0.15		0	1.85					0.77			7.24			2.00			2.94			-1.39			0.17			944			341			12.9			0.8			-10.2			5.0
ST17-1-2a-20	1.85			0.65	0.20		15.71	0.04		0.01	1.95					0.66			7.27			2.00			2.58			-1.30			0.05			939			341			12.9			0.2			-10.9			5.5
ST17-1-2a-21	1.84			0.60	0.21		15.64	0		0.01	1.99					0.66			7.31			1.98			2.57			-1.29			0.14			934			333			12.6			0.2			-11.0			5.5
ST17-2-1a-6	1.78			0.28	0.04		15.10	0.06		0.01	1.93					0.80			8.96			0.41			3.95			-1.76			0.10			684			35			1.3			2.5			-14.2			3.1
成分		基于13个阳离子										特征参数																					物理化学条件
成分		Ca	Na			K	总量		F	Cl		OHcalc			Mg/(Mg+Fe²⁺)					Si^*			AlT			Mg^*			^[6]Al^*	Mn^*			t/℃			p/MPa			深度/km			ΔNNO			lg $f O 2$			H₂O_melt
ST17-2-2a-5		1.79	0.55			0.22	15.56		0.06	0.01	1.94				0.79					7.21			2.02			2.97			-1.42	0.23			949			352			13.3			0.9			-10.1			4.9
ST17-2-2a-6		1.79	0.58			0.23	15.60		0.08	0.01	1.92				0.78					7.21			2.01			2.95			-1.43	0.20			948			348			13.1			0.8			-10.2			4.8
ST17-2-2a-7		1.77	0.59			0.22	15.58		0.03	0	1.96				0.77					7.20			2.05			2.87			-1.38	0.21			951			366			13.8			0.7			-10.3			5.1
ST17-2-2a-8		1.81	0.62			0.23	15.67		0.16	0	1.84				0.75					7.14			2.08			2.84			-1.41	0.16			960			385			14.5			0.7			-10.1			4.9
ST17-2-2a-4		1.85	0.32			0.07	15.24		0.10	0.02	1.89				0.74					8.57			0.80			3.55			-1.54	0.04			742			61			2.3			1.8			-13.4			4.3
ST17-2-1a-14		1.79	0.57			0.23	15.59		0.08	0.01	1.91				0.79					7.20			2.03			2.97			-1.42	0.21			950			358			13.5			0.9			-10.1			4.9
ST17-2-1a-15		1.89	0.61			0.23	15.72		0.16	0.01	1.83				0.67					7.28			1.95			2.66			-1.41	0.13			939			317			12.0			0.4			-10.8			4.9
ST17-2-1a-16		1.83	0.61			0.22	15.66		0.03	0	1.97				0.77					7.08			2.11			2.88			-1.40	0.15			969			399			15.1			0.7			-9.9			5.0
ST17-2-1a-17		1.83	0.61			0.24	15.67		0.10	0.01	1.89				0.74					7.14			2.07			2.84			-1.43	0.17			959			379			14.3			0.7			-10.2			4.8

Table 2 EPMA results of biotite (%)

样号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	F	Cl	根据11个氧原子计算														特征参数
样号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	F	Cl	Si	Al^Ⅳ	Al^Ⅵ	Ti	Fe³⁺	Fe²⁺	Mn	Mg	Ca	Na	K	总量	OH^-	MF	Al^Ⅵ+ Fe³⁺+Ti	Fe²⁺ +Mn	Ti/(Mg+ Fe+Ti +Mn)	Al/(Al+Mg+ Fe+Ti+ Mn+Si)
ST17-1-2a-1	36.23	4.18	13.52	16.24	0.18	13.52	0.05	0.15	9.47	0.33	0.18	2.78	1.22	0.00	0.24	0.21	0.83	0.01	1.55	0.00	0.02	0.93	7.79	2.00	0.59	0.45	0.85	0.08	0.18
ST17-1-2a-3	37.73	3.89	13.59	15.47	0.19	14.23	0.16	0.21	9.70	0.17	0.20	2.83	1.17	0.03	0.22	0.20	0.77	0.01	1.59	0.01	0.03	0.93	7.80	2.00	0.62	0.45	0.78	0.08	0.18
ST17-1-2a-5	36.04	4.11	14.62	16.90	0.28	13.11	0.17	0.12	9.56	0.18	0.16	2.74	1.26	0.05	0.23	0.19	0.89	0.02	1.48	0.01	0.02	0.93	7.81	2.00	0.58	0.47	0.90	0.08	0.19
ST17-2-1a-1	35.03	4.08	12.78	17.39	0.17	12.51	0.05	0.16	9.39	0.15	0.15	2.78	1.19	0.00	0.24	0.16	0.99	0.01	1.48	0.00	0.02	0.95	7.84	2.00	0.56	0.40	1.00	0.08	0.17
ST17-2-1a-3	36.19	4.22	13.61	17.33	0.23	13.09	0.07	0.20	9.47	0.12	0.20	2.77	1.23	0.00	0.24	0.18	0.93	0.02	1.49	0.01	0.03	0.92	7.82	2.00	0.57	0.42	0.95	0.08	0.18
ST17-2-1a-5	36.08	4.16	13.79	16.54	0.19	13.28	0.07	0.28	9.43	0.30	0.10	2.77	1.23	0.01	0.24	0.19	0.87	0.01	1.52	0.01	0.04	0.92	7.81	2.00	0.59	0.44	0.88	0.08	0.18
ST17-2-2a-1	34.62	3.98	13.42	18.28	0.32	11.55	0.01	0.10	9.47	0.22	0.20	2.75	1.25	0.01	0.24	0.17	1.04	0.02	1.37	0.00	0.02	0.96	7.83	2.00	0.53	0.42	1.06	0.08	0.18
ST17-2-2a-3	35.76	3.64	13.66	18.18	0.27	11.94	0.05	0.10	9.44	0.22	0.21	2.79	1.21	0.04	0.21	0.19	0.99	0.02	1.39	0.00	0.01	0.94	7.81	2.00	0.54	0.45	1.01	0.08	0.18

Table 3 EPMA results of plagioclase (%)

样品号	位置	SiO₂	Al₂O₃	CaO	Na₂O	K₂O	FeOT	F	MnO	MgO	V₂O₃	TiO₂	Si	Al	Ca	Na	K	端元成分
样品号	位置	SiO₂	Al₂O₃	CaO	Na₂O	K₂O	FeOT	F	MnO	MgO	V₂O₃	TiO₂	Si	Al	Ca	Na	K	An	Ab	Or
ST17-1-2a-10	核部	63.42	24.50	5.49	7.46	0.36	0.25	0	0	0.01	0.02	0	2.77	1.26	0.26	0.63	0.02	28.25	69.53	2.22
ST17-1-2a-15	边部	67.00	23.20	2.72	7.69	0.24	0.16	0.03	0.01	0.01	0	0	2.89	1.18	0.13	0.64	0.01	16.09	82.23	1.68
ST17-1-2a-12	核部	62.42	24.67	5.70	7.83	0.45	0.25	0	0	0.02	0.01	0	2.74	1.27	0.27	0.67	0.03	27.94	69.45	2.61
ST17-1-2a-13	边部	65.36	23.75	4.14	8.08	0.23	0.29	0.06	0	0	0.01	0.03	2.82	1.21	0.19	0.68	0.01	21.72	76.82	1.46
ST17-1-2a-14	核部	63.72	24.59	5.43	7.45	0.36	0.28	0.06	0	0	0	0	2.77	1.26	0.25	0.63	0.02	28.05	69.71	2.24
ST17-2-2a-12	核部	52.71	29.86	12.26	4.35	0.15	0.42	0	0.03	0.01	0	0	2.40	1.60	0.60	0.38	0.01	60.36	38.78	0.86
ST17-2-2a-13	边部	59.35	25.98	7.35	6.96	0.21	0.30	0	0	0.01	0	0.01	2.65	1.37	0.35	0.60	0.01	36.38	62.37	1.25
ST17-2-2a-14	核部	55.40	28.17	9.96	5.59	0.13	0.29	0	0	0.02	0	0	2.51	1.50	0.48	0.49	0.01	49.26	49.99	0.75
ST17-2-2a-15	边部	57.71	26.33	8.16	6.18	0.21	0.23	0	0.02	0	0	0	2.61	1.40	0.40	0.54	0.01	41.66	57.07	1.27
ST17-2-1a-7	核部	57.90	27.25	8.71	6.22	0.22	0.33	0	0.01	0.02	0	0	2.58	1.43	0.42	0.54	0.01	43.07	55.63	1.30
ST17-2-1a-8	边部	62.50	24.08	4.57	8.12	0.24	0.35	0.03	0	0	0.03	0	2.77	1.26	0.22	0.70	0.01	23.36	75.18	1.46
ST17-2-1a-9	核部	59.63	25.78	7.23	6.87	0.17	0.27	0	0.04	0	0.03	0	2.66	1.36	0.35	0.59	0.01	36.41	62.59	1.01
ST17-2-1a-10	边部	67.66	22.38	1.85	8.65	0.17	0.15	0	0	0	0	0	2.92	1.14	0.09	0.72	0.01	10.42	88.42	1.16

Fig.4 Chemical characteristics of amphibole ((a)-(b), base map after Leake et al.[20]), biotite ((c), base map after Zhou[21]) and plagioclase ((d), base map after Lai et al.[22])

Fig.5 Calculation of temperature (a), pressure (c) and oxygen fugacity (b, d) for hornblende

Fig.6 Calculation of oxygen fugacity and temperature for biotite

Fig.7 Hornblende magma source(a), the origin of the magma(b) and the classification of the genesis(c) and the tectonic setting for biotite

Fig.8 Petrogenetic model for porphyritic biotite hornblende diorite of Qicun pluton

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