Study on the two-stage garnets and their indication of mineralization in the Zhuxi W(Cu) deposit, northeastern Jiangxi Province

doi:10.13745/j.esf.sf.2019.9.6

Abstract

Abstract:

We present in this study our research on two types of coexisting scheelite-bearing garnet from the giant Zhuxi W(Cu) deposit. The results showed that the coexisting scheelite-bearing garnets are different from paragenetic garnets in other skarn deposits, as these two types of garnet commonly formed at different evolutionary stages from the same hydrothermal fluid in the Zhuxi deposit. The early-stage garnet was rich in Fe (Ad_37.17-41.84Gr_54.83-59.57Sp_3.10-4.62); whereas the late-stage one was rich in Al (Ad_12.69-14.42Gr_77.56-79.03Sp_0.44-0.92), close to grossularite with higher U and lower Sn concentrations, and exhibited obvious positive Eu anomalies in the chondrite-normalized REE patterns. These results indicated that the oxygen fugacity of the late-stage garnet is lower than that of the early-stage one. The late-stage garnet was characterized by having higher Cu, Pb, Zn, Li, Be, B, Rb, Cs and Sr and lower W, Mo, Ga and Ge concentrations. It had normalized rare earth elemental patterns roughly subparallel to the ore-related granite in the Zhuxi deposit, indicating its genetic relation with the residual magma hydrothermal fluid. These two types of coexisting scheelite-bearing garnet are the products of different ore-forming hydrothermal fluid, suggesting that at least two periods of metallogenic events related to the granitic magma are present in the Zhuxi deposit.

Key words: skarn W(Cu) deposit, garnet, in situ microanalysis, Zhuxi, northeastern Jiangxi Province

CLC Number:

OUYANG Yongpeng, ZHOU Xianrong, YAO Zaiyu, RAO Jianfeng, SONG Shiwei, WEI Jin, LU Yi. Study on the two-stage garnets and their indication of mineralization in the Zhuxi W(Cu) deposit, northeastern Jiangxi Province[J]. Earth Science Frontiers, 2020, 27(4): 219-231.

Figures/Tables 8

References 66

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两类石榴石			w_B/%														原子(离子)数
两类石榴石			SiO₂		TiO₂		Al₂O₃		Cr₂O₃		FeO		MnO		MgO	CaO	Si	Ti	Al	Cr	Fe³⁺
早	T69-3	37.14		0.04		12.75		0.00		13.64		0.71		0.06		34.95	2.94	0.00	1.19	0.85	0.00
	T69-11	37.45		0.01		13.39		0.00		13.23		0.95		0.05		34.46	2.95	0.00	1.24	0.79	0.00
	T69-13	36.69		0.03		13.75		0.00		12.23		0.69		0.02		34.93	2.92	0.00	1.29	0.76	0.00
	T69-14	34.50		0.05		12.62		0.03		13.12		0.67		0.06		33.66	2.87	0.00	1.24	0.84	0.00
晚	T69-4	35.37		0.17		17.20		0.01		4.44		0.46		2.34		35.71	2.85	0.01	1.63	0.30	0.00
	T69-8	35.15		0.14		17.54		0.03		4.26		0.22		2.19		36.07	2.83	0.01	1.66	0.29	0.00
	T69-9	36.01		0.13		17.50		0.00		4.45		0.28		2.30		35.89	2.86	0.01	1.64	0.30	0.00
	T69-10	35.75		0.24		17.42		0.00		4.66		0.22		1.75		35.19	2.88	0.01	1.65	0.31	0.00
两类石榴石			原子(离子)数								端员组分摩尔分数/%
两类石榴石			Fe²⁺		Mn		Mg		Ca		Ura		And		Pyr	Spe	Gro	Alm	Sp+Al	Gr	Ad
早	T69-3	0.05		0.05		0.01		2.96		0.00		41.84		0.23		1.56	54.83	1.54	3.10	54.83	41.84
	T69-11	0.08		0.06		0.01		2.91		0.00		38.99		0.20		2.08	56.19	2.54	4.62	56.19	38.99
	T69-13	0.05		0.05		0.00		2.98		0.00		37.17		0.09		1.51	59.57	1.66	3.17	59.57	37.17
	T69-14	0.07		0.05		0.01		3.00		0.09		40.50		0.22		1.50	55.46	2.22	3.72	55.46	40.50
晚	T69-4	0.00		0.03		0.28		3.08		0.02		13.23		8.27		0.92	77.56	0.00	0.92	77.56	13.23
	T69-8	0.00		0.02		0.26		3.11		0.10		12.69		7.74		0.44	79.03	0.00	0.44	79.03	12.69
	T69-9	0.00		0.02		0.27		3.06		0.00		13.24		8.14		0.56	78.06	0.00	0.56	78.06	13.24
	T69-10	0.00		0.02		0.21		3.04		0.00		14.42		6.44		0.46	78.68	0.00	0.46	78.68	14.42

两类石榴石			w_B/%														原子(离子)数
两类石榴石			SiO₂		TiO₂		Al₂O₃		Cr₂O₃		FeO		MnO		MgO	CaO	Si	Ti	Al	Cr	Fe³⁺
早	T69-3	37.14		0.04		12.75		0.00		13.64		0.71		0.06		34.95	2.94	0.00	1.19	0.85	0.00
	T69-11	37.45		0.01		13.39		0.00		13.23		0.95		0.05		34.46	2.95	0.00	1.24	0.79	0.00
	T69-13	36.69		0.03		13.75		0.00		12.23		0.69		0.02		34.93	2.92	0.00	1.29	0.76	0.00
	T69-14	34.50		0.05		12.62		0.03		13.12		0.67		0.06		33.66	2.87	0.00	1.24	0.84	0.00
晚	T69-4	35.37		0.17		17.20		0.01		4.44		0.46		2.34		35.71	2.85	0.01	1.63	0.30	0.00
	T69-8	35.15		0.14		17.54		0.03		4.26		0.22		2.19		36.07	2.83	0.01	1.66	0.29	0.00
	T69-9	36.01		0.13		17.50		0.00		4.45		0.28		2.30		35.89	2.86	0.01	1.64	0.30	0.00
	T69-10	35.75		0.24		17.42		0.00		4.66		0.22		1.75		35.19	2.88	0.01	1.65	0.31	0.00
两类石榴石			原子(离子)数								端员组分摩尔分数/%
两类石榴石			Fe²⁺		Mn		Mg		Ca		Ura		And		Pyr	Spe	Gro	Alm	Sp+Al	Gr	Ad
早	T69-3	0.05		0.05		0.01		2.96		0.00		41.84		0.23		1.56	54.83	1.54	3.10	54.83	41.84
	T69-11	0.08		0.06		0.01		2.91		0.00		38.99		0.20		2.08	56.19	2.54	4.62	56.19	38.99
	T69-13	0.05		0.05		0.00		2.98		0.00		37.17		0.09		1.51	59.57	1.66	3.17	59.57	37.17
	T69-14	0.07		0.05		0.01		3.00		0.09		40.50		0.22		1.50	55.46	2.22	3.72	55.46	40.50
晚	T69-4	0.00		0.03		0.28		3.08		0.02		13.23		8.27		0.92	77.56	0.00	0.92	77.56	13.23
	T69-8	0.00		0.02		0.26		3.11		0.10		12.69		7.74		0.44	79.03	0.00	0.44	79.03	12.69
	T69-9	0.00		0.02		0.27		3.06		0.00		13.24		8.14		0.56	78.06	0.00	0.56	78.06	13.24
	T69-10	0.00		0.02		0.21		3.04		0.00		14.42		6.44		0.46	78.68	0.00	0.46	78.68	14.42

两类石榴石			w_B/10^-6																																																							LREE/ HREE		(La/Yb)_N
两类石榴石			La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y			ΣREE			LREE			HREE				LREE/ HREE		(La/Yb)_N
早	T69-7		0.01			0			0			0			0			0			0.01			0.02			0.10			0.02			0.02			0.01			0.03			0			0.76			0.22			0.01			0.21				0.07		0.18
	T69-8		0.01			0.09			0.03			0.06			0.04			0.03			0.13			0.03			0.06			0.03			0.16			0.01			0.08			0.02			1.96			0.78			0.26			0.52				0.5		0.09
	T69-9		0			0			0			0			0.06			0			0			0			0.03			0.01			0.08			0.01			0.09			0.01			0.71			0.29			0.06			0.23				0.27		0
	T69-10		0			0.01			0			0			0			0.02			0			0			0.08			0.02			0.03			0			0.04			0			1.58			0.21			0.03			0.18				0.17		0
	T69-11		0.01			0			0			0.08			0.04			0.01			0			0.01			0.26			0.04			0.14			0.02			0.05			0			2.73			0.66			0.13			0.53				0.25		0.14
	T69-12		0.03			0.22			0.08			0.46			0.04			0.08			0.07			0.02			0.15			0.02			0.16			0.01			0.08			0			2.14			1.42			0.90			0.51				1.77		0.28
晚	T69-1		3.84			7.65			1.37			5.92			0.86			0.37			0.54			0.08			0.36			0.02			0.05			0			0.04			0			1.98			21.10			20.01			1.09				18.39		73.79
	T69-2		2.15			4.90			0.87			3.97			0.80			0.27			0.37			0.04			0.18			0.02			0.05			0			0.09			0			1.80			13.72			12.96			0.76				17.05		16.87
	T69-3		0.81			2.06			0.43			2.07			0.45			0.18			0.13			0.03			0.15			0			0.08			0			0			0			0.97			6.39			5.99			0.40				15.11		6.02
	T69-4		1.86			1.86			0.26			1.18			0.38			0.16			0.19			0.01			0.12			0.02			0.02			0			0.03			0.01			0.79			6.12			5.71			0.42				13.71		42.46
	T69-5		1.52			2.68			0.51			2.31			0.58			0.21			0.28			0.03			0.23			0.03			0.15			0.01			0			0.01			1.37			8.53			7.80			0.73				10.73		1.99
	T69-6		0.38			0.59			0.18			0.44			0.08			0.20			0			0			0.13			0			0			0			0.04			0.01			0.54			2.05			1.87			0.18				10.25		6.52
两类石榴石			δEu		δCe			w_B/10^-6
两类石榴石			δEu		δCe			Sn			U			Li			Be			B			Rb			Cs			Sr			Cu			Pb			Zn			Bi			Ga			Ge			As			Nb			Ta	Sb		W	Th
早	T69-7	0		0.18			679.18			0.05			0			0			0.86			0.02			0			0.06			0			0.01			12.51			0.1			112.57			128.81			0.77			13.00			1.88		0.02		0.30	0
	T69-8	1.15		0.75			774.20			0.62			0.51			0.74			0			0			0.05			0			0.06			0.02			20.19			0.07			117.09			129.58			0.61			37.84			2.99		0.03		1.70	0.01
	T69-9	0					692.73			0.02			0			0			7.22			0.22			0.53			0.17			0			0.09			15.35			0.08			144.45			147.96			0.41			16.83			2.20		0.04		1.07	0
	T69-10	5.49					720.67			0.08			0.40			0.51			1.88			0.15			0.12			0			0.13			0			17.17			0.06			132.84			133.98			0.27			24.63			3.29		0		0.94	0
	T69-11	0.67		0			789.80			0.01			0			0.30			0.17			0			0.07			0.18			0			0.03			12.55			0.11			107.94			130.57			0.80			14.90			2.46		0		0.30	0
	T69-12	4.41		0.75			988.57			2.35			0			0.63			0			0.73			1.34			0.05			0			0			28.82			0.04			87.93			96.26			0.70			86.76			1.87		0.05		1.98	0.01
晚	T69-1	1.55		0.82			109.29			59.47			46.53			997.33			117.21			0.36			0.88			10.00			0.16			1.91			699.04			612.52			80.31			39.03			8.41			9.17			1.00		2.63		0.18	0.99
	T69-2	1.35		0.88			134.18			39.83			54.56			982.33			112.83			11.79			16.85			9.76			0.49			1.63			683.25			618.10			76.65			42.61			11.46			9.79			1.05		2.80		0.07	0.77
	T69-3	1.77		0.84			78.72			13.23			24.08			520.92			213.05			0.19			0.85			12.55			0.56			1.36			613.12			303.58			68.37			37.21			10.36			9.02			0.70		2.25		0.08	0.18
	T69-4	1.60		0.58			75.19			17.33			15.34			585.37			267.22			0.23			0.10			12.27			1.46			1.60			591.73			553.39			68.02			40.69			14.45			8.02			0.55		2.35		0	0.13
	T69-5	1.42		0.74			89.14			25.67			35.17			711.18			119.13			0.84			1.90			11.25			0.93			1.56			662.61			806.06			69.63			41.91			10.81			6.32			0.42		3.01		0.03	0.24
	T69-6	6.44		0.56			75.53			7.25			10.03			415.21			317.42			0			0.01			12.05			0.77			1.82			592.14			434.72			56.25			34.53			16.65			9.97			0.81		3.20		0.03	0.02

两类石榴石			w_B/10^-6																																																							LREE/ HREE		(La/Yb)_N
两类石榴石			La			Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			Y			ΣREE			LREE			HREE				LREE/ HREE		(La/Yb)_N
早	T69-7		0.01			0			0			0			0			0			0.01			0.02			0.10			0.02			0.02			0.01			0.03			0			0.76			0.22			0.01			0.21				0.07		0.18
	T69-8		0.01			0.09			0.03			0.06			0.04			0.03			0.13			0.03			0.06			0.03			0.16			0.01			0.08			0.02			1.96			0.78			0.26			0.52				0.5		0.09
	T69-9		0			0			0			0			0.06			0			0			0			0.03			0.01			0.08			0.01			0.09			0.01			0.71			0.29			0.06			0.23				0.27		0
	T69-10		0			0.01			0			0			0			0.02			0			0			0.08			0.02			0.03			0			0.04			0			1.58			0.21			0.03			0.18				0.17		0
	T69-11		0.01			0			0			0.08			0.04			0.01			0			0.01			0.26			0.04			0.14			0.02			0.05			0			2.73			0.66			0.13			0.53				0.25		0.14
	T69-12		0.03			0.22			0.08			0.46			0.04			0.08			0.07			0.02			0.15			0.02			0.16			0.01			0.08			0			2.14			1.42			0.90			0.51				1.77		0.28
晚	T69-1		3.84			7.65			1.37			5.92			0.86			0.37			0.54			0.08			0.36			0.02			0.05			0			0.04			0			1.98			21.10			20.01			1.09				18.39		73.79
	T69-2		2.15			4.90			0.87			3.97			0.80			0.27			0.37			0.04			0.18			0.02			0.05			0			0.09			0			1.80			13.72			12.96			0.76				17.05		16.87
	T69-3		0.81			2.06			0.43			2.07			0.45			0.18			0.13			0.03			0.15			0			0.08			0			0			0			0.97			6.39			5.99			0.40				15.11		6.02
	T69-4		1.86			1.86			0.26			1.18			0.38			0.16			0.19			0.01			0.12			0.02			0.02			0			0.03			0.01			0.79			6.12			5.71			0.42				13.71		42.46
	T69-5		1.52			2.68			0.51			2.31			0.58			0.21			0.28			0.03			0.23			0.03			0.15			0.01			0			0.01			1.37			8.53			7.80			0.73				10.73		1.99
	T69-6		0.38			0.59			0.18			0.44			0.08			0.20			0			0			0.13			0			0			0			0.04			0.01			0.54			2.05			1.87			0.18				10.25		6.52
两类石榴石			δEu		δCe			w_B/10^-6
两类石榴石			δEu		δCe			Sn			U			Li			Be			B			Rb			Cs			Sr			Cu			Pb			Zn			Bi			Ga			Ge			As			Nb			Ta	Sb		W	Th
早	T69-7	0		0.18			679.18			0.05			0			0			0.86			0.02			0			0.06			0			0.01			12.51			0.1			112.57			128.81			0.77			13.00			1.88		0.02		0.30	0
	T69-8	1.15		0.75			774.20			0.62			0.51			0.74			0			0			0.05			0			0.06			0.02			20.19			0.07			117.09			129.58			0.61			37.84			2.99		0.03		1.70	0.01
	T69-9	0					692.73			0.02			0			0			7.22			0.22			0.53			0.17			0			0.09			15.35			0.08			144.45			147.96			0.41			16.83			2.20		0.04		1.07	0
	T69-10	5.49					720.67			0.08			0.40			0.51			1.88			0.15			0.12			0			0.13			0			17.17			0.06			132.84			133.98			0.27			24.63			3.29		0		0.94	0
	T69-11	0.67		0			789.80			0.01			0			0.30			0.17			0			0.07			0.18			0			0.03			12.55			0.11			107.94			130.57			0.80			14.90			2.46		0		0.30	0
	T69-12	4.41		0.75			988.57			2.35			0			0.63			0			0.73			1.34			0.05			0			0			28.82			0.04			87.93			96.26			0.70			86.76			1.87		0.05		1.98	0.01
晚	T69-1	1.55		0.82			109.29			59.47			46.53			997.33			117.21			0.36			0.88			10.00			0.16			1.91			699.04			612.52			80.31			39.03			8.41			9.17			1.00		2.63		0.18	0.99
	T69-2	1.35		0.88			134.18			39.83			54.56			982.33			112.83			11.79			16.85			9.76			0.49			1.63			683.25			618.10			76.65			42.61			11.46			9.79			1.05		2.80		0.07	0.77
	T69-3	1.77		0.84			78.72			13.23			24.08			520.92			213.05			0.19			0.85			12.55			0.56			1.36			613.12			303.58			68.37			37.21			10.36			9.02			0.70		2.25		0.08	0.18
	T69-4	1.60		0.58			75.19			17.33			15.34			585.37			267.22			0.23			0.10			12.27			1.46			1.60			591.73			553.39			68.02			40.69			14.45			8.02			0.55		2.35		0	0.13
	T69-5	1.42		0.74			89.14			25.67			35.17			711.18			119.13			0.84			1.90			11.25			0.93			1.56			662.61			806.06			69.63			41.91			10.81			6.32			0.42		3.01		0.03	0.24
	T69-6	6.44		0.56			75.53			7.25			10.03			415.21			317.42			0			0.01			12.05			0.77			1.82			592.14			434.72			56.25			34.53			16.65			9.97			0.81		3.20		0.03	0.02