Chemical Composition of Biotites Responding to Basicity of Woergei Granite Intrusion in Gansu Province and Implications for Petrogenesis and Mineralization

Abstract

Abstract:

The formation of ore deposits and the geological genesis of metallogenic rock mass are closely related to the chemical characteristics of rocks. In this paper, we centred on the investigation of relationship between the alkalinity and mineralization. The sampling and measurement of the chemical compositions of biotite, from Woergei granite intrusion in Gansu Province are carried on, and the biotite data from fifty-two kinds of different deposits in China are collected. By analyzing the basicity of host rocks, we regard that the existed metallogenic granite intrusion bearing Cu and Au were located in the high basicity area. The granite intrusion was almost related to the formation of Sn ore deposits belong to the low alkalinity rock. From the early to late period of magmatic melt transformation process, the oxygen fugacity changed from high to low and medium alkalinity increased. The formation of Cu and Au deposits was also followed by the process of diagenetic mineralization. However, the low oxygen fugacity and the high basicity are advantageous to the activation and migration of element Sn in early magmatic crystallization process. The high oxygen fugacity and the lower alkalinity are advantageous to the precipitation of cassiterite in magmatic hydrothermal-fluid stage. The precipitation of cassiterite constantly consumed oxygen, leading to a significant decrease of the higher oxygen fugacity than before. The interaction of the oxygen fugacity and the basicity caused mineralization.

Key words: biotite, genesis, basicity, oxygen fugacity, Woergei granite intrusion, Gansu Province

CLC Number:

P588.12
P578

DU Baisong, SHEN Junfeng, QIN Yuliang, LIU Haiming, LIU Shengqiang, XU Liwei, NIU Gang, OUYANG Erbiao. Chemical Composition of Biotites Responding to Basicity of Woergei Granite Intrusion in Gansu Province and Implications for Petrogenesis and Mineralization[J]. Geoscience, 2017, 31(04): 672-682.

Figures/Tables 7

References 74

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样品号	SiO₂		Al₂O₃		TiO₂		Fe₂O₃			FeO		MnO		MgO		CaO			Na₂O		K₂O	总量
W56-1	35.52		15.29		2.81		2.18			19.63		0.26		10.44		0.00			0.12		9.89	96.14
W56-2	35.50		15.04		3.15		2.04			19.36		0.21		10.55		0.00			0.30		9.92	96.07
W56-3	35.37		15.08		3.29		2.42			19.76		0.33		10.24		0.00			0.20		9.56	96.25
W56-4	35.81		15.40		3.30		2.21			17.79		0.20		11.00		0.00			0.23		10.24	96.18
W56-5	35.87		15.07		3.11		2.56			18.05		0.29		10.68		0.00			0.28		9.59	95.5
W40-1	35.55		15.19		3.14		2.68			17.71		0.25		10.56		0.00			0.21		9.46	94.75
W40-2	35.32		15.68		3.44		1.87			19.05		0.26		11.06		0.40			0.27		9.96	97.31
W40-3	35.06		15.50		2.99		2.61			18.71		0.21		10.13		0.00			0.32		9.16	94.69
W40-4	35.84		14.93		3.21		2.51			19.86		0.21		9.54		0.00			0.18		10.05	96.33
W40-5	35.52		15.29		2.81		2.18			19.63		0.26		10.44		0.00			0.12		9.89	96.14
DB2-1	35.89		15.14		3.49		2.55			17.75		0.23		10.55		0.00			0.38		9.77	95.75
DB2-2	35.89		15.39		3.18		2.64			16.70		0.18		10.82		0.00			0.35		9.64	94.79
DB2-3	36.13		15.67		3.05		2.74			15.76		0.11		11.05		0.00			0.34		9.59	94.44
DB2-4	35.66		15.35		2.99		2.56			16.64		0.20		10.86		0.00			0.34		9.56	94.16
DB5-1	36.35		14.85		2.83		2.71			19.29		0.23		9.20		0.00			0.12		10.24	95.82
DB5-2	35.59		14.66		3.20		2.25			20.41		0.23		9.35		0.00			0.22		10.12	96.03
DB5-3	35.87		14.85		3.11		2.63			19.73		0.22		9.41		0.00			0.19		9.89	95.9
DB5-4	35.91		15.51		3.02		2.67			16.19		0.16		10.96		0.00			0.34		9.56	94.32
DB5-5	35.68		14.98		3.15		2.37			19.99		0.21		9.55		0.00			0.22		10.08	96.23
DB5-6	35.84		14.93		3.21		2.51			19.86		0.21		9.54		0.00			0.18		10.05	96.33
样品号	Si	Al^IV		Ti		Fe³⁺		Fe²⁺	Mn		Mg		Al^VI		Ca		Na	K		(Mg+Fe)/Al			Si/Al
W56-1	5.44	2.56		0.32		0.25		2.51	0.03		2.38		0.20		0.00		0.07	1.97		1.87			1.97
W56-2	5.45	2.55		0.36		0.24		2.48	0.03		2.41		0.17		0.00		0.09	1.94		1.89			2.00
W56-3	5.43	2.57		0.38		0.28		2.53	0.04		2.34		0.15		0.00		0.06	1.87		1.89			1.99
W56-4	5.45	2.55		0.38		0.25		2.26	0.03		2.50		0.22		0.00		0.07	1.99		1.81			1.97
W56-5	5.50	2.50		0.36		0.30		2.31	0.04		2.44		0.22		0.00		0.08	1.87		1.85			2.02
W40-1	5.48	2.52		0.36		0.31		2.28	0.03		2.43		0.24		0.00		0.06	1.86		1.82			1.99
W40-2	5.35	2.65		0.39		0.21		2.41	0.03		2.49		0.15		0.06		0.08	1.92		1.83			1.91
W40-3	5.43	2.57		0.35		0.30		2.42	0.03		2.34		0.26		0.00		0.10	1.81		1.79			1.92
W40-4	5.50	2.50		0.37		0.29		2.55	0.03		2.18		0.20		0.00		0.05	1.97		1.86			2.04
W40-5	5.44	2.56		0.32		0.25		2.51	0.03		2.38		0.20		0.00		0.07	1.97		1.87			1.97
DB2-1	5.48	2.52		0.40		0.29		2.27	0.03		2.40		0.21		0.00		0.11	1.90		1.82			2.01
DB2-2	5.50	2.50		0.37		0.30		2.14	0.02		2.47		0.28		0.00		0.10	1.89		1.77			1.98
DB2-3	5.53	2.47		0.35		0.32		2.02	0.01		2.52		0.35		0.00		0.10	1.87		1.72			1.96
DB2-4	5.50	2.50		0.35		0.30		2.15	0.03		2.50		0.30		0.00		0.10	1.89		1.77			1.97
DB5-1	5.60	2.40		0.33		0.31		2.48	0.03		2.11		0.29		0.00		0.04	2.01		1.82			2.08
DB5-2	5.50	2.50		0.37		0.26		2.64	0.03		2.15		0.17		0.00		0.07	2.00		1.89			2.06
DB5-3	5.53	2.47		0.36		0.30		2.54	0.03		2.16		0.22		0.00		0.06	1.94		1.86			2.05
DB5-4	5.52	2.48		0.35		0.31		2.08	0.02		2.51		0.32		0.00		0.10	1.87		1.74			1.96
DB5-5	5.49	2.51		0.36		0.27		2.57	0.03		2.19		0.20		0.00		0.07	1.98		1.85			2.02
DB5-6	5.50	2.50		0.37		0.29		2.55	0.03		2.18		0.20		0.00		0.05	1.97		1.86			2.04

样品号	SiO₂		Al₂O₃		TiO₂		Fe₂O₃			FeO		MnO		MgO		CaO			Na₂O		K₂O	总量
W56-1	35.52		15.29		2.81		2.18			19.63		0.26		10.44		0.00			0.12		9.89	96.14
W56-2	35.50		15.04		3.15		2.04			19.36		0.21		10.55		0.00			0.30		9.92	96.07
W56-3	35.37		15.08		3.29		2.42			19.76		0.33		10.24		0.00			0.20		9.56	96.25
W56-4	35.81		15.40		3.30		2.21			17.79		0.20		11.00		0.00			0.23		10.24	96.18
W56-5	35.87		15.07		3.11		2.56			18.05		0.29		10.68		0.00			0.28		9.59	95.5
W40-1	35.55		15.19		3.14		2.68			17.71		0.25		10.56		0.00			0.21		9.46	94.75
W40-2	35.32		15.68		3.44		1.87			19.05		0.26		11.06		0.40			0.27		9.96	97.31
W40-3	35.06		15.50		2.99		2.61			18.71		0.21		10.13		0.00			0.32		9.16	94.69
W40-4	35.84		14.93		3.21		2.51			19.86		0.21		9.54		0.00			0.18		10.05	96.33
W40-5	35.52		15.29		2.81		2.18			19.63		0.26		10.44		0.00			0.12		9.89	96.14
DB2-1	35.89		15.14		3.49		2.55			17.75		0.23		10.55		0.00			0.38		9.77	95.75
DB2-2	35.89		15.39		3.18		2.64			16.70		0.18		10.82		0.00			0.35		9.64	94.79
DB2-3	36.13		15.67		3.05		2.74			15.76		0.11		11.05		0.00			0.34		9.59	94.44
DB2-4	35.66		15.35		2.99		2.56			16.64		0.20		10.86		0.00			0.34		9.56	94.16
DB5-1	36.35		14.85		2.83		2.71			19.29		0.23		9.20		0.00			0.12		10.24	95.82
DB5-2	35.59		14.66		3.20		2.25			20.41		0.23		9.35		0.00			0.22		10.12	96.03
DB5-3	35.87		14.85		3.11		2.63			19.73		0.22		9.41		0.00			0.19		9.89	95.9
DB5-4	35.91		15.51		3.02		2.67			16.19		0.16		10.96		0.00			0.34		9.56	94.32
DB5-5	35.68		14.98		3.15		2.37			19.99		0.21		9.55		0.00			0.22		10.08	96.23
DB5-6	35.84		14.93		3.21		2.51			19.86		0.21		9.54		0.00			0.18		10.05	96.33
样品号	Si	Al^IV		Ti		Fe³⁺		Fe²⁺	Mn		Mg		Al^VI		Ca		Na	K		(Mg+Fe)/Al			Si/Al
W56-1	5.44	2.56		0.32		0.25		2.51	0.03		2.38		0.20		0.00		0.07	1.97		1.87			1.97
W56-2	5.45	2.55		0.36		0.24		2.48	0.03		2.41		0.17		0.00		0.09	1.94		1.89			2.00
W56-3	5.43	2.57		0.38		0.28		2.53	0.04		2.34		0.15		0.00		0.06	1.87		1.89			1.99
W56-4	5.45	2.55		0.38		0.25		2.26	0.03		2.50		0.22		0.00		0.07	1.99		1.81			1.97
W56-5	5.50	2.50		0.36		0.30		2.31	0.04		2.44		0.22		0.00		0.08	1.87		1.85			2.02
W40-1	5.48	2.52		0.36		0.31		2.28	0.03		2.43		0.24		0.00		0.06	1.86		1.82			1.99
W40-2	5.35	2.65		0.39		0.21		2.41	0.03		2.49		0.15		0.06		0.08	1.92		1.83			1.91
W40-3	5.43	2.57		0.35		0.30		2.42	0.03		2.34		0.26		0.00		0.10	1.81		1.79			1.92
W40-4	5.50	2.50		0.37		0.29		2.55	0.03		2.18		0.20		0.00		0.05	1.97		1.86			2.04
W40-5	5.44	2.56		0.32		0.25		2.51	0.03		2.38		0.20		0.00		0.07	1.97		1.87			1.97
DB2-1	5.48	2.52		0.40		0.29		2.27	0.03		2.40		0.21		0.00		0.11	1.90		1.82			2.01
DB2-2	5.50	2.50		0.37		0.30		2.14	0.02		2.47		0.28		0.00		0.10	1.89		1.77			1.98
DB2-3	5.53	2.47		0.35		0.32		2.02	0.01		2.52		0.35		0.00		0.10	1.87		1.72			1.96
DB2-4	5.50	2.50		0.35		0.30		2.15	0.03		2.50		0.30		0.00		0.10	1.89		1.77			1.97
DB5-1	5.60	2.40		0.33		0.31		2.48	0.03		2.11		0.29		0.00		0.04	2.01		1.82			2.08
DB5-2	5.50	2.50		0.37		0.26		2.64	0.03		2.15		0.17		0.00		0.07	2.00		1.89			2.06
DB5-3	5.53	2.47		0.36		0.30		2.54	0.03		2.16		0.22		0.00		0.06	1.94		1.86			2.05
DB5-4	5.52	2.48		0.35		0.31		2.08	0.02		2.51		0.32		0.00		0.10	1.87		1.74			1.96
DB5-5	5.49	2.51		0.36		0.27		2.57	0.03		2.19		0.20		0.00		0.07	1.98		1.85			2.02
DB5-6	5.50	2.50		0.37		0.29		2.55	0.03		2.18		0.20		0.00		0.05	1.97		1.86			2.04