福建紫金山矿集区浸铜湖花岗斑岩的成因及构造意义

doi:10.19657/j.geoscience.1000-8527.2019.05.09

现代地质 ›› 2019, Vol. 33 ›› Issue (05): 1025-1035.DOI: 10.19657/j.geoscience.1000-8527.2019.05.09

福建紫金山矿集区浸铜湖花岗斑岩的成因及构造意义

张倩¹^,²^,³(), 吴湘滨¹^,², 杨牧¹^,², 钱美平³, 刁谦³, 孟斐斯³

1.中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙 410083
2.中南大学地球科学与信息物理学院, 湖南长沙 410083
3.江苏省有色金属华东地质勘查局江苏华东基础地质勘查有限公司, 江苏南京 210093

收稿日期:2018-05-27 修回日期:2018-11-11 出版日期:2019-10-26 发布日期:2019-10-28
通讯作者: 张倩
作者简介:张倩,女,硕士研究生,工程师,1987年出生,地质工程专业,主要从事成岩成矿作用研究。Email: 531200435@qq.com。
基金资助:
国家重点研发计划项目(2017YFC0602402);国家自然科学基金项目(41702073);中南大学“创新驱动计划”资助项目(2015CX008)

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

ZHANG Qian¹^,²^,³(), WU Xiangbin¹^,², YANG Mu¹^,², QIAN Meiping³, DIAO Qian³, MENG Feisi³

1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education, Central South University, Changsha, Hunan 410083, China
2. School of Geosciences and Info-Physics, Central South University, Changsha, Hunan 410083, China
3. Basic Geological Exploration Co., Ltd, East China Mineral Exploration and Development Bureau, Nanjing, Jiangsu 210093, China

Received:2018-05-27 Revised:2018-11-11 Online:2019-10-26 Published:2019-10-28
Contact: ZHANG Qian

摘要/Abstract

摘要：

华南中生代花岗岩成因研究对指示华南岩石圈演化机制具有重要意义,也是成岩成矿作用研究的重要内容。利用原位LA-ICP-MS锆石U-Pb年代学、微量元素及Hf同位素组成分析,对紫金山矿田内浸铜湖铜钼矿床发育的花岗斑岩开展研究,获得其成岩年龄为 (101.1±1.9) Ma,属早白垩世。浸铜湖花岗斑岩锆石Hf同位素ε_Hf(t=101 Ma) 为-6.1 ~ 0.7, 两阶段Hf模式年龄( $T D M 2$ )为1.09 ~ 1.51 Ga,不支持其形成于华夏陆壳基底物质或壳源(变质)沉积岩的直接熔融。锆石Ce⁴⁺/Ce³⁺值指示岩浆氧逸度较低,表明其成因类似于华南分异的I型花岗岩,主要源于火成岩的部分熔融作用,可能有少量地幔物质的加入。华南晚中生代古太平洋板块受俯冲作用影响,发育大规模岩浆活动,其构造背景为活动大陆边缘环境。

关键词: 锆石, 年代学, 微量元素, Hf同位素, 浸铜湖, 紫金山

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

中图分类号:

张倩, 吴湘滨, 杨牧, 钱美平, 刁谦, 孟斐斯. 福建紫金山矿集区浸铜湖花岗斑岩的成因及构造意义[J]. 现代地质, 2019, 33(05): 1025-1035.

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.

图/表 11

图1 福建省区域构造图[1,8]

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

图2 福建西南部区域构造图(a)及紫金山矿集区地质图(b)[9-10] 1.矿床;2.断裂;3.罗卜岭花岗闪长斑岩(K1);4.英安玢岩(K1);5.隐爆角砾岩(K1);6.凝灰岩(K1);7.四方花岗闪长岩(K1);8.才溪二长花岗岩(J3);9.紫金山复式岩体(J2-J3);10.第四系沉积;11.石帽山群(白垩纪);12.林地组(石炭纪);13.天瓦岽组(泥盆纪);14.楼子坝群(新元古代)

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] )

图3 浸铜湖花岗斑岩岩相学显微照片 Qtz.石英;Kfs.钾长石;Bi.黑云母

Fig.3 Representative microphotographs of the Jintonghu granite

图4 浸铜湖花岗岩的典型锆石CL图像(实线圆圈代表年龄测试点,圆圈直径代表分析测试直径25 μm;虚线圆圈代表锆石Hf同位素测试点,圆圈直径代表分析测试直径45 μm)

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))

图5 浸铜湖花岗斑岩(ZK23201-7)的LA-ICP-MS 锆石U-Pb谐和曲线图(a)与微量元素含量球粒陨石标准化图(b) (标准化值据文献[16])

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])

表1 浸铜湖花岗斑岩LA-ICP-MS锆石U-Pb定年结果

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

表1 浸铜湖花岗斑岩LA-ICP-MS锆石U-Pb定年结果

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

表2 浸铜湖花岗斑岩锆石微量元素含量(wB/10-6)分析结果

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

表2 浸铜湖花岗斑岩锆石微量元素含量(wB/10-6)分析结果

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

表3 浸铜湖花岗斑岩LA-MC-ICP-MS锆石原位Lu-Hf同位素组成分析结果

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

表3 浸铜湖花岗斑岩LA-MC-ICP-MS锆石原位Lu-Hf同位素组成分析结果

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

图6 浸铜湖花岗斑岩的锆石εHf(t)柱状图解(a)和εHf(t) vs. U-Pb年龄图(b) (阴影代表华夏地块地壳基底演化域[17])

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])

图7 浸铜湖花岗斑岩锆石的εHf(t)及U-Pb年龄与华夏内陆白垩纪时期代表性侵入岩的相互关系图(阴影代表华夏地块纯壳源花岗岩[1,3,10,21]) DM.亏损地幔;CHUR.球粒陨石均一储集库

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])

图8 浸铜湖花岗斑岩的年龄-εNd(t)(a)及(87Sr/86Sr)i-εNd(t)图(b)[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]

参考文献 27

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福建紫金山矿集区浸铜湖花岗斑岩的成因及构造意义

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

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