Petrogenesis and Tectonic Implications of the Jintonghu Granitic Porphyry in Zijinshan Orefield, Fujian Province

doi:10.19657/j.geoscience.1000-8527.2019.05.09

Abstract

Abstract:

Genesis of Mesozoic granites in South China is important for studying the evolution of the lithosphere, as well as the regional granite petrogenesis and related mineralization. In this contribution, in-situ LA-ICP-MS U-Pb, trace element and Hf isotope analyses of zircon were conducted to constrain the emplacement age and petrogenesis of the granitic porphyry at the Jintonghu Cu-Mo deposit, western Fujian, China. The Jintonghu granitic porphyry is U-Pb dated to be Early Cretaceous (101.1±1.9 Ma). The zircon ε_Hf(t) values (-6.1 to 0.7) and the two-stage Hf model ages (1.09 to 1.51 Ga) preclude the possiblilty that the parental magmas of the Jintonghu granitic porphyry was dominantly sourced from the basement materials or metasedimentary rocks. The low zircon Ce⁴⁺/Ce³⁺ ratios suggest that the Jintonghu granitic porphyry mimics fractionated I-type granites in the Nanling Range, and the magmas were likely derived from older felsic igneous domains with little juvenile material contributions. Interpretations of the elemental and isotopic data suggests that the Jintonghu granite was most likely derived from partial melting of old deep-seated magmatic rocks due to the subduction of Paleo-Pacific Plate in an active continental marginal setting.

Key words: zircon, geochronology, trace element, Hf isotope, Jintonghu, Zijinshan

CLC Number:

ZHANG Qian, WU Xiangbin, YANG Mu, QIAN Meiping, DIAO Qian, MENG Feisi. Petrogenesis and Tectonic Implications of the Jintonghu Granitic Porphyry in Zijinshan Orefield, Fujian Province[J]. Geoscience, 2019, 33(05): 1025-1035.

Figures/Tables 11

Fig.1 Regional tectonic framework of Fujian Province[1,8]

Fig.2 Regional tectonic framework of the Zijinshan region(a) and Geologic map of the Zijinshan Cu-Au orefield, showing the clustering of porphyry Cu-Mo and porphyry-epithermal Au-Cu deposits (b)(modified after Ref. [9-10] )

Fig.3 Representative microphotographs of the Jintonghu granite

Fig.4 Zircon cathodoluminescence (CL) images and analysis spots of the Jintonghu granite (solid-line circles denote the U-Pb dating spots (spot size: 25 μm); dash-line circles denote the Lu-Hf isotopic analysis spots (spot size: 45 μm))

Fig.5 LA-ICP-MS zircon U-Pb concordia diagram (a) and chondrite-normalized REE patterns (b) of representative zircon grains from the Jintonghu granite (ZK23201-7) (normalizing values from Ref. [16])

Table 1 LA-ICP-MS zircon U-Pb data for the Jintonghu granite

测点	w/10^-6			w(Th)/ w(U)	Ti			同位素比值						年龄/Ma
测点	Pb	Th	U	w(Th)/ w(U)	w/10^-6	T_Ti/℃		²⁰⁶Pb/²³⁸U	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁷Pb/²⁰⁶Pb	±1σ		²⁰⁶Pb/²³⁸U		±1σ		²⁰⁷Pb/²³⁵U		±1σ		²⁰⁷Pb/²⁰⁶Pb		±1σ
23201-7-2	6.86	257	301	0.85	2.88		642	0.016 4	0.000 4	0.121 0	0.006 7	0.054 6	0.003 1	105		2		116		6		394		128
23201-7-4	10.63	858	371	2.31	23.7		823	0.015 3	0.000 3	0.124 4	0.007 8	0.059 2	0.003 7	98		2		119		7		576		137
23201-7-5	7.52	76	399	0.19	18.8		800	0.016 2	0.000 3	0.115 8	0.005 4	0.052 1	0.002 4	103		2		111		5		300		103
23201-7-6	19.76	259	661	0.39				0.025 8	0.000 5	0.173 2	0.006 6	0.048 9	0.001 8	164		3		162		6		143		87
23201-7-7	18.25	27	78	0.35				0.191 5	0.003 0	2.021 2	0.066 9	0.076 9	0.002 7	1 129		16		1 123		22		1 118		66
23201-7-8	10.17	414	456	0.91				0.016 2	0.000 3	0.108 6	0.005 0	0.049 0	0.002 5	104		2		105		5		146		114
23201-7-9	4.25	115	137	0.84				0.022 8	0.000 6	0.158 4	0.011 6	0.053 4	0.004 5	146		4		149		10		346		191
23201-7-12	4.35	402	147	2.74	5.33		688	0.015 1	0.000 8	0.119 6	0.013 7	0.059 0	0.006 3	97		5		115		12		569		231
23201-7-13	11.13	333	562	0.59	31.0		851	0.014 9	0.000 4	0.116 9	0.009 1	0.057 3	0.004 4	95		3		112		8		502		172
23201-7-14	74.01	333	875	0.38				0.070 4	0.000 8	0.552 1	0.011 0	0.056 6	0.001 1	438		5		446		7		476		43
23201-7-16	8.54	322	403	0.80	15.6		782	0.015 5	0.000 3	0.116 2	0.006 4	0.056 5	0.003 3	99		2		112		6		472		127
23201-7-17	7.50	302	353	0.86	12.6		762	0.016 3	0.000 4	0.105 9	0.005 3	0.049 0	0.002 6	104		2		102		5		146		122
23201-7-18	17.28	1 510	583	2.59	47.7		900	0.015 7	0.000 2	0.119 2	0.005 6	0.055 2	0.002 6	100		1		114		5		420		101
23201-7-19	15.87	1 148	532	2.16	16.6		787	0.016 7	0.000 3	0.121 5	0.005 5	0.053 8	0.002 6	107		2		116		5		361		107
23201-7-20	6.37	168	193	0.87				0.024 6	0.000 5	0.162 7	0.008 9	0.049 5	0.002 9	157		3		153		8		172		137
23201-7-22	7.06	456	288	1.58	39.0		877	0.015 4	0.000 3	0.112 8	0.006 2	0.055 3	0.003 3	98		2		109		6		433		133
23201-7-23	9.60	258	274	0.94				0.024 8	0.000 5	0.179 5	0.010 1	0.053 2	0.003 3	158		3		168		9		339		141
23201-7-25	27.80	1843	1 107	1.66	7.05		711	0.015 6	0.000 2	0.101 8	0.003 4	0.047 2	0.001 5	100		1		98		3		61		139

Table 1 LA-ICP-MS zircon U-Pb data for the Jintonghu granite

测点	w/10^-6			w(Th)/ w(U)	Ti			同位素比值						年龄/Ma
测点	Pb	Th	U	w(Th)/ w(U)	w/10^-6	T_Ti/℃		²⁰⁶Pb/²³⁸U	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁷Pb/²⁰⁶Pb	±1σ		²⁰⁶Pb/²³⁸U		±1σ		²⁰⁷Pb/²³⁵U		±1σ		²⁰⁷Pb/²⁰⁶Pb		±1σ
23201-7-2	6.86	257	301	0.85	2.88		642	0.016 4	0.000 4	0.121 0	0.006 7	0.054 6	0.003 1	105		2		116		6		394		128
23201-7-4	10.63	858	371	2.31	23.7		823	0.015 3	0.000 3	0.124 4	0.007 8	0.059 2	0.003 7	98		2		119		7		576		137
23201-7-5	7.52	76	399	0.19	18.8		800	0.016 2	0.000 3	0.115 8	0.005 4	0.052 1	0.002 4	103		2		111		5		300		103
23201-7-6	19.76	259	661	0.39				0.025 8	0.000 5	0.173 2	0.006 6	0.048 9	0.001 8	164		3		162		6		143		87
23201-7-7	18.25	27	78	0.35				0.191 5	0.003 0	2.021 2	0.066 9	0.076 9	0.002 7	1 129		16		1 123		22		1 118		66
23201-7-8	10.17	414	456	0.91				0.016 2	0.000 3	0.108 6	0.005 0	0.049 0	0.002 5	104		2		105		5		146		114
23201-7-9	4.25	115	137	0.84				0.022 8	0.000 6	0.158 4	0.011 6	0.053 4	0.004 5	146		4		149		10		346		191
23201-7-12	4.35	402	147	2.74	5.33		688	0.015 1	0.000 8	0.119 6	0.013 7	0.059 0	0.006 3	97		5		115		12		569		231
23201-7-13	11.13	333	562	0.59	31.0		851	0.014 9	0.000 4	0.116 9	0.009 1	0.057 3	0.004 4	95		3		112		8		502		172
23201-7-14	74.01	333	875	0.38				0.070 4	0.000 8	0.552 1	0.011 0	0.056 6	0.001 1	438		5		446		7		476		43
23201-7-16	8.54	322	403	0.80	15.6		782	0.015 5	0.000 3	0.116 2	0.006 4	0.056 5	0.003 3	99		2		112		6		472		127
23201-7-17	7.50	302	353	0.86	12.6		762	0.016 3	0.000 4	0.105 9	0.005 3	0.049 0	0.002 6	104		2		102		5		146		122
23201-7-18	17.28	1 510	583	2.59	47.7		900	0.015 7	0.000 2	0.119 2	0.005 6	0.055 2	0.002 6	100		1		114		5		420		101
23201-7-19	15.87	1 148	532	2.16	16.6		787	0.016 7	0.000 3	0.121 5	0.005 5	0.053 8	0.002 6	107		2		116		5		361		107
23201-7-20	6.37	168	193	0.87				0.024 6	0.000 5	0.162 7	0.008 9	0.049 5	0.002 9	157		3		153		8		172		137
23201-7-22	7.06	456	288	1.58	39.0		877	0.015 4	0.000 3	0.112 8	0.006 2	0.055 3	0.003 3	98		2		109		6		433		133
23201-7-23	9.60	258	274	0.94				0.024 8	0.000 5	0.179 5	0.010 1	0.053 2	0.003 3	158		3		168		9		339		141
23201-7-25	27.80	1843	1 107	1.66	7.05		711	0.015 6	0.000 2	0.101 8	0.003 4	0.047 2	0.001 5	100		1		98		3		61		139

Table 2 Zircon trace element contents (10-6) of the Jintonghu granite

点		La		Ce	Pr		Nd		Sm	Eu	Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		Nb		Hf		Ta		Ce⁴⁺/Ce³⁺		Ce/Ce^*		Eu/Eu^*
23201-7-1		0.18		39.0	0.51		6.16		12.9	5.24	52.4		16.4		163		46.6		184		36.8		364		69.7		1 556		5.58		10 797		2.15		25.8		30.7		0.62
23201-7-2		0.081		20.8	0.31		5.68		10.8	5.46	49.9		15.8		183		66.6		293		63.5		619		121		1 930		3.58		10 581		1.14		26.2		31.4		0.72
23201-7-4		0.20		126	0.83		13.9		22.7	8.27	91.5		24.1		255		84.4		349		69.9		630		114		2 475		5.80		9 068		1.77		57.1		73.4		0.55
23201-7-5		0.089		8.89	0.031		0.29		0.82	0.21	4.08		1.63		23.1		9.73		53.0		13.6		163		40.0		341		2.86		13 814		1.34		294		40.6		0.35
23201-7-10		0.11		105	0.96		14.6		19.2	8.02	69.7		19.1		200		68.0		293		59.9		569		105		2 028		3.94		8 864		1.16		60.3		77.5		0.67
23201-7-12		0.18		72.3	1.22		19.9		27.4	11.7	96.7		24.9		238		74.5		304		59.3		532		96.5		2 199		2.53		8 593		0.78		26.0		36.9		0.70
23201-7-13		0.34		25.7	0.13		0.98		2.36	1.16	12.7		3.99		50.7		19.9		98.1		23.8		253		55.8		649		3.47		12 141		0.93		43.1		29.7		0.65
点	La		Ce		Pr	Nd		Sm		Eu		Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		Nb		Hf		Ta		Ce⁴⁺/Ce³⁺		Ce/Ce^*	Eu/Eu^*
23201-7-15	0.10		70.4		0.85	14.80		22.2		10.60		79.5		21.80		223.0		76.4		316		67.6		643		116.0		2 240		2.92		8 782		1.03		42.1		57.3	0.77
23201-7-16	0.26		49.5		0.12	1.29		2.56		1.10		14.7		4.95		63.0		26.5		134		33.3		356		77.9		882		6.18		11 981		2.03		326.0		67.2	0.55
23201-7-17	0.03		62.3		0.17	2.44		3.87		1.64		22.1		7.51		89.4		34.9		167		38.1		381		75.9		1 114		6.28		10 890		2.10		212.0		218.0	0.54
23201-7-18	20.00		292.0		4.58	27.30		28.40		9.69		108.0		32.90		339.0		106.0		415		79.7		695		127.0		3 255		19.90		9 380		4.19		29.7		7.3	0.54
23201-7-19	0.38		151.0		0.78	12.80		21.20		7.81		92.1		27.10		284.0		97.7		410		82.5		753		142.0		2 905		10.90		9 996		2.49		57.4		66.9	0.54
23201-7-22	0.33		67.6		0.85	13.20		20.90		8.02		76.1		20.70		217.0		73.0		312		63.1		589		115.0		2 193		3.55		10 021		1.26		25.1		30.6	0.62
23201-7-25	0.50		119.0		0.36	4.42		8.19		2.36		45.1		15.60		184.0		66.6		292		60.4		556		105.0		2 020		17.90		12 746		5.62		178.0		67.5	0.38

Table 2 Zircon trace element contents (10-6) of the Jintonghu granite

点		La		Ce	Pr		Nd		Sm	Eu	Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		Nb		Hf		Ta		Ce⁴⁺/Ce³⁺		Ce/Ce^*		Eu/Eu^*
23201-7-1		0.18		39.0	0.51		6.16		12.9	5.24	52.4		16.4		163		46.6		184		36.8		364		69.7		1 556		5.58		10 797		2.15		25.8		30.7		0.62
23201-7-2		0.081		20.8	0.31		5.68		10.8	5.46	49.9		15.8		183		66.6		293		63.5		619		121		1 930		3.58		10 581		1.14		26.2		31.4		0.72
23201-7-4		0.20		126	0.83		13.9		22.7	8.27	91.5		24.1		255		84.4		349		69.9		630		114		2 475		5.80		9 068		1.77		57.1		73.4		0.55
23201-7-5		0.089		8.89	0.031		0.29		0.82	0.21	4.08		1.63		23.1		9.73		53.0		13.6		163		40.0		341		2.86		13 814		1.34		294		40.6		0.35
23201-7-10		0.11		105	0.96		14.6		19.2	8.02	69.7		19.1		200		68.0		293		59.9		569		105		2 028		3.94		8 864		1.16		60.3		77.5		0.67
23201-7-12		0.18		72.3	1.22		19.9		27.4	11.7	96.7		24.9		238		74.5		304		59.3		532		96.5		2 199		2.53		8 593		0.78		26.0		36.9		0.70
23201-7-13		0.34		25.7	0.13		0.98		2.36	1.16	12.7		3.99		50.7		19.9		98.1		23.8		253		55.8		649		3.47		12 141		0.93		43.1		29.7		0.65
点	La		Ce		Pr	Nd		Sm		Eu		Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		Nb		Hf		Ta		Ce⁴⁺/Ce³⁺		Ce/Ce^*	Eu/Eu^*
23201-7-15	0.10		70.4		0.85	14.80		22.2		10.60		79.5		21.80		223.0		76.4		316		67.6		643		116.0		2 240		2.92		8 782		1.03		42.1		57.3	0.77
23201-7-16	0.26		49.5		0.12	1.29		2.56		1.10		14.7		4.95		63.0		26.5		134		33.3		356		77.9		882		6.18		11 981		2.03		326.0		67.2	0.55
23201-7-17	0.03		62.3		0.17	2.44		3.87		1.64		22.1		7.51		89.4		34.9		167		38.1		381		75.9		1 114		6.28		10 890		2.10		212.0		218.0	0.54
23201-7-18	20.00		292.0		4.58	27.30		28.40		9.69		108.0		32.90		339.0		106.0		415		79.7		695		127.0		3 255		19.90		9 380		4.19		29.7		7.3	0.54
23201-7-19	0.38		151.0		0.78	12.80		21.20		7.81		92.1		27.10		284.0		97.7		410		82.5		753		142.0		2 905		10.90		9 996		2.49		57.4		66.9	0.54
23201-7-22	0.33		67.6		0.85	13.20		20.90		8.02		76.1		20.70		217.0		73.0		312		63.1		589		115.0		2 193		3.55		10 021		1.26		25.1		30.6	0.62
23201-7-25	0.50		119.0		0.36	4.42		8.19		2.36		45.1		15.60		184.0		66.6		292		60.4		556		105.0		2 020		17.90		12 746		5.62		178.0		67.5	0.38

Table 3 LA-MC-ICP-MS zircon Lu-Hf isotopic compositions of the Jintonghu granite

测点	年龄/ Ma	¹⁷⁶Yb/¹⁷⁷Hf		¹⁷⁶Lu/¹⁷⁷Hf		¹⁷⁶Hf/¹⁷⁷Hf		ε_Hf(0)	ε_Hf(t)	2σ	$t D M 1$ /Ma	$t D M 2$ /Ma	$f Lu / Hf$
测点	年龄/ Ma	比值	2σ	比值	2σ	比值	2σ	ε_Hf(0)	ε_Hf(t)	2σ	$t D M 1$ /Ma	$t D M 2$ /Ma	$f Lu / Hf$
23201-7-02	105	0.065 834	0.002 520	0.001 928	0.000 087	0.282 703	0.000 035	-2.9	-0.7	1.2	798	1 181	-0.94
23201-7-04	98	0.012 020	0.000 211	0.000 447	0.000 002	0.282 577	0.000 027	-7.3	-5.2	1.0	941	1 459	-0.99
23201-7-05	103	0.070 432	0.004 813	0.001 876	0.000 121	0.282 727	0.000 038	-2.1	0.1	1.3	762	1 128	-0.94
23201-7-06	164	0.038 420	0.000 342	0.001 095	0.000 016	0.282 506	0.000 024	-9.9	-6.3	0.8	1 058	1 581	-0.97
23201-7-08	104	0.040 636	0.000 549	0.001 206	0.000 025	0.282 741	0.000 028	-1.5	0.7	1.0	728	1 092	-0.96
23201-7-09	146	0.038 405	0.000 697	0.001 000	0.000 009	0.282 585	0.000 030	-7.1	-3.9	1.1	944	1 416	-0.97
23201-7-12	97	0.052 582	0.003 062	0.001 424	0.000 071	0.282 686	0.000 035	-3.5	-1.4	1.3	810	1 220	-0.96
23201-7-13	95	0.021 715	0.000 261	0.000 707	0.000 004	0.282 555	0.000 029	-8.1	-6.1	1.0	978	1 511	-0.98
23201-7-14	438	0.083 864	0.003 456	0.002 309	0.000 090	0.282 332	0.000 026	-16.0	-6.9	0.9	1 346	1 831	-0.93
23201-7-16	99	0.047 612	0.000 972	0.001 466	0.000 029	0.282 600	0.000 029	-6.5	-4.4	1.0	934	1 411	-0.96
23201-7-17	104	0.050 265	0.002 030	0.001 427	0.000 039	0.282 733	0.000 033	-1.8	0.4	1.2	743	1 110	-0.96
23201-7-18	100	0.079 498	0.001 728	0.002 196	0.000 068	0.282 677	0.000 031	-3.8	-1.7	1.1	840	1 241	-0.93
23201-7-19	107	0.055 910	0.001 582	0.001 520	0.000 054	0.282 623	0.000 031	-5.7	-3.5	1.1	903	1 356	-0.95
23201-7-20	157	0.025 418	0.000 772	0.000 675	0.000 010	0.282 470	0.000 027	-11.1	-7.7	1.0	1 096	1 663	-0.98
23201-7-23	158	0.054 562	0.003 072	0.001 449	0.000 065	0.282 577	0.000 032	-7.4	-4.0	1.1	967	1 429	-0.96
23201-7-25	100	0.051 579	0.001 457	0.001 384	0.000 029	0.282 557	0.000 027	-8.1	-5.9	0.9	994	1 507	-0.96

Table 3 LA-MC-ICP-MS zircon Lu-Hf isotopic compositions of the Jintonghu granite

测点	年龄/ Ma	¹⁷⁶Yb/¹⁷⁷Hf		¹⁷⁶Lu/¹⁷⁷Hf		¹⁷⁶Hf/¹⁷⁷Hf		ε_Hf(0)	ε_Hf(t)	2σ	$t D M 1$ /Ma	$t D M 2$ /Ma	$f Lu / Hf$
测点	年龄/ Ma	比值	2σ	比值	2σ	比值	2σ	ε_Hf(0)	ε_Hf(t)	2σ	$t D M 1$ /Ma	$t D M 2$ /Ma	$f Lu / Hf$
23201-7-02	105	0.065 834	0.002 520	0.001 928	0.000 087	0.282 703	0.000 035	-2.9	-0.7	1.2	798	1 181	-0.94
23201-7-04	98	0.012 020	0.000 211	0.000 447	0.000 002	0.282 577	0.000 027	-7.3	-5.2	1.0	941	1 459	-0.99
23201-7-05	103	0.070 432	0.004 813	0.001 876	0.000 121	0.282 727	0.000 038	-2.1	0.1	1.3	762	1 128	-0.94
23201-7-06	164	0.038 420	0.000 342	0.001 095	0.000 016	0.282 506	0.000 024	-9.9	-6.3	0.8	1 058	1 581	-0.97
23201-7-08	104	0.040 636	0.000 549	0.001 206	0.000 025	0.282 741	0.000 028	-1.5	0.7	1.0	728	1 092	-0.96
23201-7-09	146	0.038 405	0.000 697	0.001 000	0.000 009	0.282 585	0.000 030	-7.1	-3.9	1.1	944	1 416	-0.97
23201-7-12	97	0.052 582	0.003 062	0.001 424	0.000 071	0.282 686	0.000 035	-3.5	-1.4	1.3	810	1 220	-0.96
23201-7-13	95	0.021 715	0.000 261	0.000 707	0.000 004	0.282 555	0.000 029	-8.1	-6.1	1.0	978	1 511	-0.98
23201-7-14	438	0.083 864	0.003 456	0.002 309	0.000 090	0.282 332	0.000 026	-16.0	-6.9	0.9	1 346	1 831	-0.93
23201-7-16	99	0.047 612	0.000 972	0.001 466	0.000 029	0.282 600	0.000 029	-6.5	-4.4	1.0	934	1 411	-0.96
23201-7-17	104	0.050 265	0.002 030	0.001 427	0.000 039	0.282 733	0.000 033	-1.8	0.4	1.2	743	1 110	-0.96
23201-7-18	100	0.079 498	0.001 728	0.002 196	0.000 068	0.282 677	0.000 031	-3.8	-1.7	1.1	840	1 241	-0.93
23201-7-19	107	0.055 910	0.001 582	0.001 520	0.000 054	0.282 623	0.000 031	-5.7	-3.5	1.1	903	1 356	-0.95
23201-7-20	157	0.025 418	0.000 772	0.000 675	0.000 010	0.282 470	0.000 027	-11.1	-7.7	1.0	1 096	1 663	-0.98
23201-7-23	158	0.054 562	0.003 072	0.001 449	0.000 065	0.282 577	0.000 032	-7.4	-4.0	1.1	967	1 429	-0.96
23201-7-25	100	0.051 579	0.001 457	0.001 384	0.000 029	0.282 557	0.000 027	-8.1	-5.9	0.9	994	1 507	-0.96

Fig.6 Zircon εHf(t) histogram (a), Zircon εHf(t) vs. U-Pb age diagram (b) for the Jintonghu granite from the Cathaysia Block (Shaded region denotes Hf isotope evolution for the Cathaysia crustal basement[17])

Fig.7 Zircon Hf isotopes vs.U-Pb age diagram for representative Cretaceous intrusions along the Fujian inland and coastal area, respectively (Hf evolutionary field shown for the crust-derived melts with insignificant juvenile input in Cathaysia Block[1,3,10,21])

Fig.8 Diagrams of age vs. εNd(t) (a) and initial (87Sr/86Sr)i vs. εNd(t) (b) for the intrusions[10, 21]

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