江南造山带西段桂北四堡地区830 Ma辉长岩锆石SIMS U-Pb年代学和岩石地球化学特征及其岩石成因研究

doi:10.13745/j.esf.sf.2021.7.11

地学前缘 ›› 2022, Vol. 29 ›› Issue (2): 218-233.DOI: 10.13745/j.esf.sf.2021.7.11

• 洋板块地质与造山带地质 • 上一篇下一篇

江南造山带西段桂北四堡地区830 Ma辉长岩锆石SIMS U-Pb年代学和岩石地球化学特征及其岩石成因研究

寇彩化¹(), 刘燕学¹^,^*(), 李江², 李廷栋¹, 丁孝忠¹, 刘勇¹, 靳胜凯³

1.中国地质科学院地质研究所, 北京 100037
2.广西壮族自治区地质调查院, 广西南宁 530023
3.中国地质大学(北京), 北京 100083

收稿日期:2021-04-30 修回日期:2021-06-02 出版日期:2022-03-25 发布日期:2022-03-31
通讯作者: 刘燕学
作者简介:寇彩化(1985—),女,副研究员,主要从事岩石地球化学研究。E-mail: caihuakou@163.com
基金资助:
中国地质调查局项目(1212011120117);中国地质调查局项目(1212011120115);国家自然科学基金项目(41972069)

Geochronology and geochemistry of 830 Ma gabbro in the western segment of the Jiangnan Orogen and constraint on its petrogenesis

KOU Caihua¹(), LIU Yanxue¹^,^*(), LI Jiang², LI Tingdong¹, DING Xiaozhong¹, LIU Yong¹, JIN Shengkai³

1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2. Guangxi Zhuang Autonomous Region Geological Survey Institute, Nanning 530023, China
3. China University of Geosciences (Beijing), Beijing 100083, China

Received:2021-04-30 Revised:2021-06-02 Online:2022-03-25 Published:2022-03-31
Contact: LIU Yanxue

摘要/Abstract

摘要：

本次研究对象为江南造山带西段桂北四堡地区新元古代辉长岩,主要由斜长石和单斜辉石组成,含有少量的橄榄石和钛铁氧化物,表明在岩浆演化过程中发生了斜长石和单斜辉石以及少量橄榄石的分离结晶作用。辉长岩锆石SIMS U-Pb谐和年龄为(830±7)Ma,指示其侵位年龄约为830 Ma。全岩具有低SiO₂含量(48.46%~53.99%)、高MgO含量(9.27%~25.22%)、Mg^#值较高(62~79)的特征。辉长岩为钙碱性系列岩石,其稀土元素球粒陨石标准化和微量元素原始地幔标准化与典型的弧岩浆相似,具有相对富集轻稀土元素((La/Yb)_N=2.2~3.7,(La/Sm)_N=2.5~2.9)和大离子亲石元素,明显的高场强元素(Nb、Ta和Ti)亏损的特征,还具有较高的Th/Nb比值(0.7~0.8)和低Nb/La比值(0.4~0.6)。辉长岩具有负的ε_Nd(t)值(-6.3~-3.0)和正的ε_Hf(t)值(8.0~12.1),指示其源区为亏损地幔,但有富集组分加入。结合区域地质特征,推测辉长岩形成于活动大陆边缘俯冲构造背景,起源于受沉积物流体交代了的楔地幔。

关键词: 江南造山带西段, 新元古代基性岩, 锆石SIMS U-Pb年龄, 岩石成因, 构造背景

Abstract:

We report gabbro discovered in the western segment of the Jiangnan Orogen Belt, Sibao area, northern Guangxi Province. The gabbro contains mostly plagioclase and clinopyroxene and a small amount of olivine and Fe-Ti oxide minerals, indicating likely fractionation of plagioclase, clinopyroxene and some olivine within the magma chamber. The gabbro specimen has a zircon SIMS U-Pb age of (830±7) Ma, suggesting gabbro emplacement at ~830 Ma. The bulk-rock is characterized by relatively low SiO₂ (48.46%-53.99%) and high MgO (9.27%-25.22%) contents with Mg^# of 62-79. It belongs to typical calc-alkalic arc rock, characterized by enrichments of light rare earth elements and large-ion lithophile elements relative to heavy rare earth elements ((La/Yb)_N=2.2-3.7, (La/Sm)_N=2.5-2.9), significantly negative Nb, Ta and Ti anomalies, and relatively high Th/Nb (0.7-0.8) and low Nb/La (0.4-0.6) ratios. The gabbro specimen has negative ε_Nd(t) (-6.3--3.0) and positive ε_Hf(t) (8.0-12.1), indicating it is sourced from depleted mantle with the addition of enriched components. In combination with the regional geology, we infer the gabbro is derived from depleted mantle wedge metasomatized by sediment-derived fluids and formed in the active continental margin in a subduction setting.

Key words: western Jiangnan Orogen, Neoproterozoic mafic intrusion, Zircon SIMS U-Pb dating, petrogenesis, tectonic setting

中图分类号:

寇彩化, 刘燕学, 李江, 李廷栋, 丁孝忠, 刘勇, 靳胜凯. 江南造山带西段桂北四堡地区830 Ma辉长岩锆石SIMS U-Pb年代学和岩石地球化学特征及其岩石成因研究[J]. 地学前缘, 2022, 29(2): 218-233.

KOU Caihua, LIU Yanxue, LI Jiang, LI Tingdong, DING Xiaozhong, LIU Yong, JIN Shengkai. Geochronology and geochemistry of 830 Ma gabbro in the western segment of the Jiangnan Orogen and constraint on its petrogenesis[J]. Earth Science Frontiers, 2022, 29(2): 218-233.

图/表 15

图1 江南造山带及邻区构造框架图(a)和江南造山带西段地质概况图(b)(a据文献[2]修改,b中研究区引自文献[8-9,12,17,20,25,30-34])

Fig.1 (a) Tectonic framework of the Jiangnan Orogen (JO) and adjacent area (modified from [2]),and (b) geological sketch map of the western segment of JO (study area locations from [8-9,12,17,20,25,30-34])

图2 桂北四堡辉长岩地质图(据文献[35]修改)

Fig.2 Geological map of the Sibao area, northern Guangxi Province, showing the distribution of gabbro and the sampling location. Modified after [35].

图3 桂北四堡辉长岩显微镜特征 Pl—斜长石;Cpx—单斜辉石;Ol—橄榄石;正交偏光。

Fig.3 Thin section photomicrographs (in cross-polarized light) of gabbro from Sibao area, northern Guangxi Province (cross polarized)

表1 桂北四堡辉长岩SIMS锆石U-Pb年龄

Table 1 Results of SIMS U-Pb dating of zircon from gabbro of Sibao area, northern Guangxi Province

表2 桂北四堡辉长岩锆石 Lu-Hf同位素

Table 2 Results of Lu-Hf isotopic analysis of gabbro from Sibao area, northern Guangxi Province

图4 桂北四堡辉长岩锆石CL图像和U-Pb年龄图解

Fig.4 CL images and U-Pb ages of gabbro from Sibao area, northern Guangxi Province

表3 桂北四堡辉长岩全岩主量元素和微量元素

Table 3 Whole rock major and trace element composition of gabbro from Sibao area, northern Guangxi Province

样号	w_B/%																																						Mg^#
样号	SiO₂			Al₂O₃			FeO^T			MgO			CaO				Na₂O			K₂O				MnO			TiO₂			P₂O₅				LOI		Total			Mg^#
1211-6	51.45			12.56			12.31			11.54			7.31				2.10			1.76				0.22			0.69			0.07				5.15		94.85			67
1211-7	48.82			17.07			13.42			10.24			6.64				1.43			1.48				0.22			0.61			0.06				4.00		96.00			62
1211-8	52.28			12.49			11.97			11.36			7.38				2.22			1.31				0.24			0.67			0.07				4.91		95.09			67
1211-9	53.99			14.53			10.04			9.27			7.88				2.32			1.10				0.25			0.56			0.06				2.44		97.56			66
1211-10	48.82			9.15			12.93			21.23			6.82				0.26			0.07				0.19			0.48			0.06				5.33		94.67			78
1211-11	49.19			8.44			13.31			21.97			6.05				0.28			0.06				0.22			0.42			0.07				5.41		94.59			78
1211-12	48.59			9.64			13.15			21.50			6.23				0.29			0.06				0.18			0.48			0.05				5.36		94.64			78
1211-13	48.46			7.50			14.05			25.22			4.06				0.08			0.03				0.18			0.39			0.05				6.99		93.01			79
1211-14	48.50			8.56			13.65			23.09			5.31				0.20			0.05				0.18			0.42			0.04				5.93		94.07			78
样号	w_B/10^-6
样号	Rb		Ba			Th			U			Nb			Ta			La			Ce		Pr			Sr			Nd			Sm			Zr		Hf			Eu
1211-6	114		473			5.01			0.876			6.06			0.568			10.70			20.2		2.67			149			10.90			2.61			46.9		1.81			0.738
1211-7	103		90.2			3.38			0.507			4.01			0.427			6.67			12.9		1.70			162			7.03			1.74			24.6		1.00			0.453
1211-8	59.9		550			4.28			0.918			5.87			0.485			11.40			21.7		2.83			149			11.50			2.69			60.5		1.93			0.776
1211-9	74.2		128			3.15			0.574			4.32			0.404			8.99			17.7		2.34			138			9.56			2.29			32.3		1.20			0.600
1211-10	8.81		84.0			2.83			0.817			3.89			0.390			7.00			14.6		1.90			21.6			7.88			1.82			59.2		1.70			0.424
1211-11	2.96		3.94			2.52			0.659			3.37			0.338			7.84			15.2		1.93			12.7			7.95			1.79			47.0		1.38			0.505
1211-12	1.42		3.81			2.74			0.586			3.48			0.381			6.77			13.4		1.75			13.9			7.23			1.67			49.7		1.57			0.486
1211-13	1.09		4.00			2.36			0.441			3.04			0.321			5.55			11.1		1.42			18.3			5.93			1.37			27.9		0.889			0.219
1211-14	0.925		3.28			2.65			0.495			3.28			0.337			7.02			11.4		1.28			9.81			6.90			1.54			41.5		1.29			0.274
样号	w_B/10^-6																																(La/Sm)_N					(La/Yb)_N			δEu
样号	Ti	Gd			Tb			Dy			Ho			Y		Er			Tm			Yb			Lu			Cr			Ni		(La/Sm)_N					(La/Yb)_N			δEu
1211-6	4 109	2.55			0.562			3.47			0.756			18.3		2.15			0.405			2.46			0.359			846			499		2.65					3.12			0.86
1211-7	3 659	1.81			0.428			2.68			0.624			15.3		1.81			0.359			2.18			0.326			536			125		2.47					2.19			0.77
1211-8	4 036	2.69			0.573			3.48			0.795			18.7		2.13			0.401			2.48			0.353			881			604		2.74					3.30			0.87
1211-9	3 371	2.32			0.512			3.18			0.722			17.4		1.99			0.377			2.26			0.310			555			109		2.53					2.85			0.79
1211-10	2 876	1.87			0.400			2.48			0.533			13.1		1.50			0.281			1.78			0.258			2 434			498		2.48					2.82			0.70
1211-11	2 543	1.76			0.373			2.20			0.486			12.0		1.40			0.257			1.59			0.223			2 598			575		2.83					3.54			0.86
1211-12	2 891	1.70			0.374			2.22			0.512			12.0		1.41			0.269			1.58			0.232			2 765			587		2.62					3.07			0.87
1211-13	2 309	1.33			0.272			1.64			0.359			8.35		0.994			0.186			1.1			0.170			2 548			615		2.62					3.62			0.49
1211-14	2 524	1.53			0.324			1.97			0.447			10.5		1.23			0.232			1.37			0.201			2 957			618		2.94					3.68			0.54

表3 桂北四堡辉长岩全岩主量元素和微量元素

Table 3 Whole rock major and trace element composition of gabbro from Sibao area, northern Guangxi Province

样号	w_B/%																																						Mg^#
样号	SiO₂			Al₂O₃			FeO^T			MgO			CaO				Na₂O			K₂O				MnO			TiO₂			P₂O₅				LOI		Total			Mg^#
1211-6	51.45			12.56			12.31			11.54			7.31				2.10			1.76				0.22			0.69			0.07				5.15		94.85			67
1211-7	48.82			17.07			13.42			10.24			6.64				1.43			1.48				0.22			0.61			0.06				4.00		96.00			62
1211-8	52.28			12.49			11.97			11.36			7.38				2.22			1.31				0.24			0.67			0.07				4.91		95.09			67
1211-9	53.99			14.53			10.04			9.27			7.88				2.32			1.10				0.25			0.56			0.06				2.44		97.56			66
1211-10	48.82			9.15			12.93			21.23			6.82				0.26			0.07				0.19			0.48			0.06				5.33		94.67			78
1211-11	49.19			8.44			13.31			21.97			6.05				0.28			0.06				0.22			0.42			0.07				5.41		94.59			78
1211-12	48.59			9.64			13.15			21.50			6.23				0.29			0.06				0.18			0.48			0.05				5.36		94.64			78
1211-13	48.46			7.50			14.05			25.22			4.06				0.08			0.03				0.18			0.39			0.05				6.99		93.01			79
1211-14	48.50			8.56			13.65			23.09			5.31				0.20			0.05				0.18			0.42			0.04				5.93		94.07			78
样号	w_B/10^-6
样号	Rb		Ba			Th			U			Nb			Ta			La			Ce		Pr			Sr			Nd			Sm			Zr		Hf			Eu
1211-6	114		473			5.01			0.876			6.06			0.568			10.70			20.2		2.67			149			10.90			2.61			46.9		1.81			0.738
1211-7	103		90.2			3.38			0.507			4.01			0.427			6.67			12.9		1.70			162			7.03			1.74			24.6		1.00			0.453
1211-8	59.9		550			4.28			0.918			5.87			0.485			11.40			21.7		2.83			149			11.50			2.69			60.5		1.93			0.776
1211-9	74.2		128			3.15			0.574			4.32			0.404			8.99			17.7		2.34			138			9.56			2.29			32.3		1.20			0.600
1211-10	8.81		84.0			2.83			0.817			3.89			0.390			7.00			14.6		1.90			21.6			7.88			1.82			59.2		1.70			0.424
1211-11	2.96		3.94			2.52			0.659			3.37			0.338			7.84			15.2		1.93			12.7			7.95			1.79			47.0		1.38			0.505
1211-12	1.42		3.81			2.74			0.586			3.48			0.381			6.77			13.4		1.75			13.9			7.23			1.67			49.7		1.57			0.486
1211-13	1.09		4.00			2.36			0.441			3.04			0.321			5.55			11.1		1.42			18.3			5.93			1.37			27.9		0.889			0.219
1211-14	0.925		3.28			2.65			0.495			3.28			0.337			7.02			11.4		1.28			9.81			6.90			1.54			41.5		1.29			0.274
样号	w_B/10^-6																																(La/Sm)_N					(La/Yb)_N			δEu
样号	Ti	Gd			Tb			Dy			Ho			Y		Er			Tm			Yb			Lu			Cr			Ni		(La/Sm)_N					(La/Yb)_N			δEu
1211-6	4 109	2.55			0.562			3.47			0.756			18.3		2.15			0.405			2.46			0.359			846			499		2.65					3.12			0.86
1211-7	3 659	1.81			0.428			2.68			0.624			15.3		1.81			0.359			2.18			0.326			536			125		2.47					2.19			0.77
1211-8	4 036	2.69			0.573			3.48			0.795			18.7		2.13			0.401			2.48			0.353			881			604		2.74					3.30			0.87
1211-9	3 371	2.32			0.512			3.18			0.722			17.4		1.99			0.377			2.26			0.310			555			109		2.53					2.85			0.79
1211-10	2 876	1.87			0.400			2.48			0.533			13.1		1.50			0.281			1.78			0.258			2 434			498		2.48					2.82			0.70
1211-11	2 543	1.76			0.373			2.20			0.486			12.0		1.40			0.257			1.59			0.223			2 598			575		2.83					3.54			0.86
1211-12	2 891	1.70			0.374			2.22			0.512			12.0		1.41			0.269			1.58			0.232			2 765			587		2.62					3.07			0.87
1211-13	2 309	1.33			0.272			1.64			0.359			8.35		0.994			0.186			1.1			0.170			2 548			615		2.62					3.62			0.49
1211-14	2 524	1.53			0.324			1.97			0.447			10.5		1.23			0.232			1.37			0.201			2 957			618		2.94					3.68			0.54

图5 桂北四堡辉长岩微量元素标准化图解 (标准化数据、OIB和E/N-MORB数据引自文献[40];Mariana Arc数据引自[41];江南造山带西段860~830 Ma基性-超基性岩数据引自文献[12,17,20,23,25,27-30])

Fig.5 Normalized trace element patterns of gabbro from Sibao area, northern Guangxi Province. Normalized values and OIB and E/N-MORB data from [40]. Mariana Arc data from [41]. Data for 860-830 Ma mafic-ultramafic rocks from the western segment of the Jiangnan Orogen adapted from [12, 17, 20, 23, 25, 27-30].

表4 桂北四堡辉长岩全岩Sm-Nd同位素

Table 4 Bulk rock composition of Sm-Nd isotope for the gabbro from Sibao area in northern Guangxi Province

样号	w_B/10^-6		¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	Nd标准误差	(¹⁴³Nd/¹⁴⁴Nd)_i	εNd(t)
样号	Sm	Nd	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	Nd标准误差	(¹⁴³Nd/¹⁴⁴Nd)_i	εNd(t)
1211-6	2.42	10.10	0.144 2	0.512 085	0.000 004	0.511 291	-5.2
1211-7	1.56	6.21	0.151 8	0.512 184	0.000 006	0.511 348	-4
1211-8	2.44	10.30	0.143 6	0.512 086	0.000 006	0.511 295	-5.1
1211-9	2.09	8.50	0.148 5	0.512 219	0.000 006	0.511 401	-3
1211-10	1.70	7.19	0.143 0	0.512 056	0.000 007	0.511 268	-5.6
1211-11	1.69	7.40	0.138 3	0.512 009	0.000 018	0.511 247	-6
1211-12	1.58	6.76	0.141 3	0.512 055	0.000 008	0.511 277	-5.4
1211-13	1.19	4.98	0.144 7	0.512 041	0.000 006	0.511 244	-6.1
1211-14	1.34	5.50	0.146 9	0.512 042	0.000 009	0.511 330	-6.3

图6 桂北四堡辉长岩岩石系列判别图解(a底图引自文献[24], b底图引自文献[43]) a—TAS图解;b—SiO2-FeOT/MgO图解。江南造山带西段860~830 Ma基性-超基性岩数据来源同图5。

Fig.6 Discrimination diagrams for gabbroic rocks in the Sibao area, northern Guangxi Province. Adapted from [24, 43].

图7 桂北四堡辉长岩(Th/Ta)PM-(La/Nb)PM图解(底图据文献[45])

Fig.7 Diagram of(Th/Ta)PM-(La/Nb)PM for the gabbro from Sibao area in northern Guangxi Province. Adapted from 45.

图8 桂北四堡辉长岩MgO与主要氧化物和部分微量元素哈克图解

Fig.8 Variations of MgO versus major and certain trace elements for the gabbro from Sibao area in northern Guangxi Province

图9 桂北四堡辉长岩Hf同位素图解 DM—亏损地幔储库;CHUR—球粒陨石储库。

Fig.9 Hf isotope for the gabbro from Sibao area in northern Guangxi Province

图10 桂北四堡辉长岩构造判别图解(a-d底图分别据文献[49,50,51,52]) a—Zr-Ti图解;b—Ti/1 000-V图解;c—Ti/Y-Zr/Y图解;d—Ta/Yb-Th/Yb图解。VAB—火山弧玄武岩;WPB—板内玄武岩;VAT—火山弧型拉斑玄武岩;CFB—大陆溢流玄武岩;MORB—洋中脊玄武岩;OIB—洋岛玄武岩;PMB—板块边缘玄武岩;OA—大洋弧玄武岩;ACM—活动大陆边缘弧玄武岩。

Fig.10 Diagrams of tectonic setting for the gabbro from Sibao area in northern Guangxi Province. Adapted from [49-52].

图11 桂北四堡辉长岩微量元素比值图解

Fig.11 Diagrams of trace elements ratios for the gabbro from Sibao area in northern Guangxi Province

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江南造山带西段桂北四堡地区830 Ma辉长岩锆石SIMS U-Pb年代学和岩石地球化学特征及其岩石成因研究

Geochronology and geochemistry of 830 Ma gabbro in the western segment of the Jiangnan Orogen and constraint on its petrogenesis

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