赣南上洞变玄武岩矿物学、地球化学特征及其成因

马玉香; 刘帅; 杜后发; 姚玥; 赵亮

doi:10.12097/gbc.2024.04.046

赣南上洞变玄武岩矿物学、地球化学特征及其成因

东华理工大学地球科学学院, 江西南昌 330013

基金项目: 国家自然科学基金项目《赣南-粤北相邻区河口−南迳加里东期火山岩研究与铀成矿关系》(批准号：41662006)

详细信息

作者简介: 马玉香(1999− )，女，硕士，从事地球化学研究。E−mail：3517962405@qq.com

通讯作者: 刘帅(1978− )，男，博士，教授，从事矿产普查与勘探研究。E−mail：Liushuai7821@163.com

中图分类号: P575；P595

收稿日期: 2024-04-24

修回日期: 2024-06-18

刊出日期: 2025-05-15

Mineralogical, geochemical characteristics, and genesis of Shangdong meta-basalt in Southern Jiangxi

School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China

More Information

Corresponding author: LIU Shuai, Liushuai7821@163.com

Received Date: 24 April 2024

Revised Date: 18 June 2024

Publish Date: 15 May 2025

摘要

摘要: 研究目的
最新在赣南上洞发现的变玄武岩位于华夏加里东褶皱带南缘，对其成因和形成构造环境研究，可为解释华南加里东褶皱带构造属性提供依据。
研究方法
以上洞变玄武岩为研究对象，进行了矿物学、地球化学特征研究。
研究结果
上洞变玄武岩的主要组成矿物为角闪石、斜长石、辉石和黑云母；全岩地球化学分析显示，变玄武岩属于亚碱性拉斑玄武岩系列，具有中等Mg^#(40.44～45.16)、富钠贫钾(K₂O/Na₂O=0.07～0.16)，轻稀土元素中等富集，无显著Eu异常(Eu=1.03～1.11)，富Nb、显著的Sr-Nb-Ta弱亏损特征。矿物学研究显示，辉石具富镁、富钙的特点，属普通辉石，结晶温度1184℃；黑云母为铁质黑云母，结晶温度660℃，具有富铝、富铁，贫镁、贫钾的特点；角闪石具贫钛、富钙、富铁、富铝的特点，属钙质闪石组中的普通角闪石，结晶温度594℃；斜长石具贫钛、富钠、富铝的特点，属于中长石-奥长石。
结论
研究表明，赣南上洞变玄武岩形成于高温、高氧逸度的环境，属于壳幔混源的玄武质岩浆，具有岛弧环境特征，暗示华南早古生代加里东期构造背景应属于俯冲背景。
- 变玄武岩 /
- 矿物学 /
- 地球化学 /
- 岩石成因 /
- 赣南上洞
Abstract: Objectives
The recently discovered meta−basalt in Shangdong, southern Jiangxi Province, is situated at the southern margin of the Cathaysia Caledonian fold belt. Investigating its petrogenesis and tectonic setting of formation is crucial for elucidating the tectonic nature of the South China Caledonian fold belt.
Methods
This study focuses on the Shangdong meta−basalt, employing a comprehensive approach combining mineralogical observations and detailed geochemical analyses to constrain its geological history.
Results
Mineralogical examination reveals that the Shangdong meta−basalt is primarily composed of hornblende, plagioclase, pyroxene, and biotite. Geochemical data indicate that it belongs to the sub−alkaline tholeiite series, characterized by moderate Mg^# values (40.44~45.16), a distinct Na−rich/K−poor signature (K₂O/Na₂O=0.07~0.16), moderate enrichment of light rare earth elements, negligible Eu anomalies (Eu=1.03~1.11), and notable depletion in Sr, Nb, and Ta despite relative Nb enrichment. Mineral−specific analyses further demonstrate that pyroxene is a Mg−Ca−rich augite with a crystallization temperature of 1184 °C; biotite is ferrobiotite, crystallizing at 660 °C and exhibiting high Al and Fe contents with low Mg and K; hornblende is a Ca−rich, Ti−poor, Fe−Al−enriched common hornblende within the calcic amphibole group, crystallizing at 594°C; and plagioclase is a Ti−poor, Na−Al−rich andesine−oligoclase.
Conclusions
Collectively, these findings suggest that the Shangdong meta−basalt formed under high−temperature and high oxygen fugacity conditions, originating from a magma generated by crust−mantle mixing. Its geochemical and mineralogical features are indicative of an island arc tectonic setting, strongly implying that the South China region experienced a subduction−related tectonic regime during the Early Paleozoic Caledonian orogeny.
- meta−basalt /
- mineralogy /
- geochemistry /
- petrogenesis /
- Shangdong in Southern Jiangxi

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图 1 华南区域构造简图(a，据舒良树等，2012)和区域大地构造、深断裂分布图(b，据朱捌，2010)

Figure 1.

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图 2 上洞变玄武岩手标本及岩相学照片

Figure 2.

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图 3 辉石正交偏光、背散射( BSE) 图像和对应 Ca、Mg、Fe、Si、Ti、Na、K、Al 元素面扫描图（单位为质量分数%）

Figure 3.

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图 4 辉石 Wo−En−Fs分类图解(a，据Morimoto,1988)和Si – Al^Ⅳ图(b，据Kushiro,1960)

Figure 4.

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图 5 黑云母分类图解(a，据Foster, 1960)和黑云母成分10×TiO₂−TFeO−MgO图解(b，据Nachit et al,2005)

Figure 5.

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图 6 角闪石分类及成因判别图解(据靳是琴，1991)

Figure 6.

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图 7 斜长石成分分类图解(据Deer, 1992)

Figure 7.

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图 8 火山岩Nb/Y−Zr/TiO₂×0.0001岩石化学分类图解(a，周岱等，2017)和玄武岩Zr−P₂O₅判别图解（b，Winchester and Floyd,1976）

Figure 8.

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图 9 原始地幔标准化微量元素蛛网图(a)和球粒陨石标准化稀土元素配分图(b)(标准化值据Sun and McDonough,1989)

Figure 9.

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图 10 玄武岩MgO−Nb/La（a）和Nb−Nb/U（b）图解(据Kepezhinskas et al., 1996)

Figure 10.

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图 11 黑云母Fe²⁺−Fe³⁺−Mg²⁺图解(a，据Wones, 1989)和Ti−Mg/(Mg+Fe)图解(b，据Henry et al., 2005)

Figure 11.

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图 12 角闪石SiO₂−Na₂O图解(据Coltorti et al., 2007)

Figure 12.

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图 13 黑云母MgO−TFeO/(TFeO+MgO)图解(a，据周作侠，1988)和角闪石Ca−( Fe²⁺ + Fe³⁺)−Mg图解(b，据谢应雯和张玉泉，1990)

Figure 13.

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图 14 玄武岩中单斜辉石F1-F2图解(a，据Nisbet and Pearce, 1977)和玄武岩Th-Hf/3-Nb/6判别图解(b，据Wood, 1979)

Figure 14.

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表 1 辉石化学组成电子探针分析结果与结构计算

Table 1. Electron microporbe analyses and structural formula of pyroxene %

样品号	SD202-3									SD203-1
点号	1	2	3	5	6	7	8	9	10	2	4	8	9	10	11	12
SiO₂	51.94	53.02	54.41	51.89	53.33	50.84	52.83	51.88	51.66	52.50	51.78	51.30	50.68	52.31	51.26	50.53
Al₂O₃	2.68	2.25	2.55	2.55	1.98	4.09	2.21	2.66	2.26	2.91	3.38	3.72	4.55	3.17	4.11	4.63
K₂O	0.03	0.03	0.04	0.03	0.02	0.08	0.03	0.02	0.03	0.08	0.08	0.09	0.10	0.05	0.12	0.11
MnO	0.36	0.29	0.30	0.35	0.34	0.29	0.31	0.28	0.33	0.31	0.31	0.32	0.32	0.31	0.32	0.27
TiO₂	0.41	0.16	0.32	0.37	0.10	0.23	0.35	0.18	1.40	0.04	0.18	0.18	0.19	0.11	0.20	0.15
CaO	13.06	13.40	12.87	13.19	13.27	13.18	13.39	13.30	13.92	12.32	12.38	12.16	12.30	12.19	12.19	12.13
Na₂O	0.24	0.22	0.26	0.25	0.18	0.40	0.16	0.26	0.24	0.17	0.33	0.29	0.37	0.24	0.36	0.41
MgO	15.03	15.59	14.59	15.54	15.67	13.85	15.93	15.18	14.49	12.82	13.04	12.90	12.27	13.47	12.67	12.45
Cl	0.00	0.01	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01
FeO	14.00	13.69	13.14	13.51	13.10	15.08	13.72	13.79	13.60	16.54	15.39	15.31	15.73	14.94	15.94	15.94
P₂O₅	0.01	0.00	0.00	0.01	0.01	0.00	0.01	0.01	0.01	0.00	0.01	0.00	0.03	0.04	0.00	0.02
总计	97.75	98.65	98.48	97.70	98.01	98.06	99.14	97.54	97.93	97.69	96.86	96.27	96.55	96.82	97.17	96.64
Ca	0.54	0.54	0.53	0.54	0.54	0.54	0.54	0.55	0.57	0.51	0.52	0.51	0.52	0.51	0.51	0.51
Mg	0.86	0.88	0.83	0.89	0.89	0.79	0.90	0.87	0.83	0.74	0.76	0.76	0.72	0.78	0.74	0.73
Ti	0.01	0.00	0.01	0.01	0.00	0.01	0.01	0.01	0.04	0.00	0.01	0.01	0.01	0.00	0.01	0.00
Si	1.99	2.01	2.07	1.98	2.03	1.95	2.00	1.99	1.99	2.04	2.02	2.01	1.99	2.04	2.00	1.98
Al^IV	0.12	0.10	0.11	0.11	0.09	0.14	0.10	0.12	0.10	0.13	0.16	0.17	0.18	0.15	0.17	0.18
Al^VI	0.00	0.00	0.00	0.00	0.00	0.04	0.00	0.00	0.00	0.00	0.00	0.00	0.03	0.00	0.02	0.03
Fe³⁺	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Fe²⁺	0.44	0.43	0.41	0.43	0.41	0.48	0.43	0.44	0.43	0.53	0.49	0.50	0.51	0.48	0.51	0.52
Mn	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
K	0.02	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.01	0.01
P	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Na	0.00	0.02	0.02	0.02	0.01	0.03	0.01	0.02	0.02	0.01	0.02	0.02	0.03	0.02	0.03	0.03
总计	4.00	4.00	3.99	4.00	3.99	3.99	4.00	4.00	4.00	3.99	3.99	3.99	3.99	3.99	3.99	3.99
En	45.95	46.84	46.23	46.99	47.63	42.70	47.45	46.12	44.52	41.10	42.00	42.07	40.25	43.51	40.99	40.57
Fs	24.41	23.36	23.40	23.36	22.66	26.47	23.26	23.82	23.76	29.80	27.96	28.18	29.14	27.17	29.13	29.28
Wo	28.69	28.94	29.30	28.67	28.99	29.22	28.67	29.04	30.75	28.38	28.67	28.51	29.01	28.31	28.35	28.41
Mg^#	0.61	0.62	0.56	0.63	0.61	0.59	0.63	0.62	0.59	0.51	0.51	0.48	0.50	0.51	0.53	0.49
Fe^*	0.46	0.44	0.43	0.44	0.43	0.49	0.44	0.45	0.45	0.55	0.51	0.50	0.52	0.49	0.53	0.52
属性	普通辉石

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续表1
样品号	SD203-2		SD203-3						SD204-2									SD204-3
点号	14	15	3	9	10	13	15	17	2	3	4	5	7	8	9	10	13	1	2	3
SiO₂	52.32	52.19	51.09	51.63	51.08	52.36	50.87	52.49	52.90	52.37	52.46	53.18	52.85	52.35	52.73	53.55	51.79	50.74	52.69	50.71
Al₂O₃	2.89	3.05	4.15	3.54	4.34	3.13	3.65	2.69	1.80	2.56	2.24	1.96	2.06	2.25	2.19	2.95	2.95	3.72	2.42	3.84
K₂O	0.08	0.10	0.11	0.09	0.11	0.09	0.10	0.07	0.03	0.03	0.04	0.04	0.03	0.02	0.02	0.03	0.05	0.10	0.03	0.07
MnO	0.32	0.30	0.28	0.32	0.33	0.28	0.35	0.30	0.30	0.30	0.22	0.24	0.30	0.29	0.29	0.28	0.27	0.27	0.28	0.30
TiO₂	0.08	0.07	0.16	0.08	0.15	0.08	0.09	0.03	0.14	0.18	0.31	0.12	0.35	0.31	0.25	0.21	0.17	0.16	0.49	0.21
CaO	12.14	12.18	13.03	13.17	13.11	12.22	12.11	12.29	12.25	12.15	12.25	12.25	12.25	12.24	12.25	11.47	12.33	12.19	12.46	12.09
Na₂O	0.25	0.27	0.35	0.28	0.37	0.27	0.34	0.19	0.16	0.26	0.18	0.15	0.17	0.16	0.17	0.26	0.28	0.39	0.18	0.37
MgO	13.23	13.38	13.62	14.49	13.70	13.51	13.07	12.99	14.68	14.04	14.31	14.42	14.34	14.30	14.42	13.25	14.51	12.84	14.88	13.23
Cl	0.00	0.00	0.01	0.01	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00
FeO	15.76	15.26	15.52	15.01	15.69	14.93	15.44	16.10	14.11	14.38	14.58	14.26	14.20	14.41	14.41	15.07	13.96	16.21	14.15	15.76
P₂O₅	0.00	0.04	0.03	0.00	0.01	0.01	0.00	0.00	0.02	0.00	0.02	0.03	0.00	0.01	0.02	0.01	0.00	0.00	0.00	0.01
总计	97.08	96.84	98.35	98.62	98.91	96.91	96.27	97.18	96.40	96.31	96.62	96.66	96.56	96.43	96.80	97.09	96.45	96.68	97.65	96.63
Ca	0.51	0.51	0.53	0.54	0.54	0.51	0.51	0.51	0.51	0.51	0.51	0.51	0.51	0.51	0.51	0.48	0.51	0.51	0.51	0.51
Mg	0.77	0.78	0.78	0.82	0.78	0.78	0.78	0.77	0.85	0.82	0.83	0.84	0.83	0.83	0.84	0.77	0.84	0.75	0.85	0.77
Ti	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.01	0.00	0.01	0.01	0.01	0.01	0.01	0.00	0.01	0.01
Si	2.04	2.04	1.96	1.97	1.95	2.04	2.04	2.00	2.06	2.05	2.05	2.07	2.06	2.05	2.05	2.09	2.02	1.99	2.03	1.98
Al^IV	0.13	0.14	0.17	0.16	0.17	0.14	0.14	0.17	0.08	0.12	0.10	0.09	0.09	0.10	0.10	0.14	0.14	0.17	0.11	0.16
Al^VI	0.00	0.00	0.02	0.00	0.02	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01
Fe³⁺	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Fe²⁺	0.51	0.49	0.49	0.48	0.50	0.48	0.48	0.50	0.45	0.46	0.47	0.46	0.45	0.46	0.46	0.48	0.45	0.53	0.45	0.51
Mn	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
K	0.00	0.01	0.01	0.00	0.01	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.00
P	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Na	0.02	0.02	0.03	0.02	0.03	0.02	0.02	0.03	0.01	0.02	0.01	0.01	0.01	0.01	0.01	0.02	0.02	0.03	0.01	0.03
总计	3.99	3.99	4.00	4.00	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99	3.99
En	42.46	43.06	42.24	44.08	42.09	43.53	43.53	42.19	46.37	44.97	45.40	45.91	45.73	45.51	45.68	43.82	45.90	41.06	46.42	42.23
Fs	28.49	27.66	27.32	26.01	27.48	27.04	27.04	28.29	25.13	25.97	25.93	25.44	25.48	25.82	25.71	27.79	24.94	29.28	24.90	28.49
Wo	28.00	28.17	29.05	28.80	28.96	28.30	28.30	28.10	27.82	27.97	27.92	28.04	28.09	28.00	27.90	27.26	28.03	28.02	27.94	27.75
Mg^#	0.53	0.54	0.57	0.61	0.58	0.53	0.54	0.54	0.56	0.55	0.55	0.55	0.55	0.55	0.55	0.49	0.58	0.54	0.57	0.55
Fe*	0.53	0.51	0.50	0.49	0.51	0.50	0.52	0.54	0.47	0.48	0.48	0.47	0.47	0.48	0.48	0.50	0.46	0.54	0.47	0.53
属性	普通辉石
注：以6个O原子为基准计算的阳离子

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表 2 黑云母电子探针分析结果

Table 2. Electron microprobe analyses of biotite %

样品号	SD204-1										SD204-2
点号	6	8	11	12	14	15	16	19	20	22	19	20	21	23	24
SiO₂	35.52	36.13	35.28	35.44	35.79	35.15	34.84	35.39	35.65	35.48	35.39	35.63	34.99	35.57	35.51
Al₂O₃	16.06	15.47	15.41	13.98	16.04	15.34	15.62	15.72	15.14	15.81	16.28	15.74	15.77	15.95	16.22
K₂O	9.36	9.25	9.33	9.35	9.41	9.23	8.99	9.13	9.20	9.01	9.40	9.38	9.19	9.27	8.63
MnO	0.15	0.11	0.13	0.16	0.17	0.15	0.13	0.11	0.12	0.15	0.20	0.17	0.15	0.17	0.14
Cr₂O₃	0.04	0.07	0.08	0.12	0.03	0.24	0.99	0.09	0.03	0.10	0.02	0.04	0.12	0.02	0.10
TiO₂	2.81	3.06	2.60	2.64	2.68	2.75	2.80	2.87	2.93	2.82	2.55	2.58	2.70	2.45	2.31
CaO	0.00	0.05	0.04	0.02	0.02	0.05	0.09	0.05	0.03	0.07	0.11	0.08	0.13	0.08	0.18
NiO	0.00	0.00	0.00	0.02	0.00	0.01	0.00	0.02	0.03	0.02	0.03	0.00	0.02	0.00	0.03
Na₂O	0.02	0.03	0.06	0.07	0.04	0.03	0.02	0.05	0.04	0.06	0.11	0.05	0.11	0.05	0.06
MgO	9.41	9.74	9.68	10.04	9.74	9.87	9.79	9.58	9.72	9.66	9.39	9.55	9.54	9.75	9.88
F	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.46	0.63	0.85	0.00	0.00	0.00	0.00
Cl	0.02	0.00	0.01	0.02	0.01	0.01	0.01	0.02	0.01	0.01	0.01	0.00	0.01	0.01	0.02
TFeO	21.44	21.19	21.21	21.28	21.34	20.81	20.75	21.04	21.01	20.88	20.70	21.15	20.72	20.73	20.60
P₂O₅	0.00	0.00	0.00	0.00	0.01	0.01	0.00	0.00	0.02	0.01	0.00	0.00	0.00	0.00	0.01
总计	94.83	95.10	93.83	93.14	95.28	93.63	94.03	94.05	94.39	94.71	95.04	94.36	93.46	94.06	93.69
Si	5.51	5.61	5.48	5.50	5.55	5.45	5.41	5.49	5.53	5.51	5.49	5.53	5.43	5.52	5.51
Al^IV	2.49	2.39	2.52	2.50	2.45	2.55	2.59	2.51	2.47	2.49	2.51	2.47	2.57	2.48	2.49
Al^VI	0.45	0.44	0.29	0.06	0.49	0.26	0.27	0.37	0.30	0.40	0.47	0.41	0.32	0.44	0.48
Ti	0.33	0.36	0.30	0.31	0.31	0.32	0.33	0.34	0.34	0.33	0.30	0.30	0.31	0.29	0.27
Fe³⁺	0.41	0.24	0.24	0.41	0.42	0.41	0.42	0.23	0.48	0.48	0.50	0.42	0.40	0.40	0.38
Fe²⁺	2.34	2.48	2.56	2.32	2.26	2.34	2.32	2.47	2.24	2.19	2.23	2.25	2.31	2.28	2.36
Mn	0.02	0.01	0.02	0.02	0.02	0.02	0.02	0.01	0.02	0.02	0.03	0.02	0.02	0.02	0.02
Mg	2.18	2.25	2.24	2.32	2.25	2.28	2.26	2.22	2.25	2.24	2.17	2.21	2.21	2.26	2.29
Ca	0.00	0.01	0.01	0.00	0.00	0.01	0.02	0.01	0.00	0.01	0.02	0.01	0.02	0.01	0.03
Na	0.01	0.01	0.02	0.02	0.01	0.01	0.01	0.01	0.01	0.02	0.03	0.01	0.03	0.02	0.02
K	1.85	1.83	1.85	1.85	1.86	1.83	1.78	1.81	1.82	1.78	1.86	1.86	1.82	1.83	1.71
Cl	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00
F	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.23	0.31	0.42	0.00	0.00	0.00	0.00
总计	15.59	15.63	15.53	15.32	15.64	15.48	15.42	15.47	15.70	15.78	16.03	15.50	15.45	15.55	15.55
Mg^#	0.44	0.45	0.45	0.46	0.45	0.46	0.46	0.45	0.45	0.45	0.45	0.45	0.45	0.46	0.46
注：以22个氧原子为基准计算的阳离子

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表 3 角闪石电子探针分析数据

Table 3. Electron microprobe analyses of amphibol %

样品号	SD202-1															SD203-2
测点号	6	7	8	9	10	16	17	18	19	20	21	22	23	24	25	36	37	38	39	40	41	42	43	44
SiO₂	43.44	43.33	44.64	44.56	45.61	43.59	43.79	44.99	44.22	43.12	44.98	43.64	43.36	44.80	44.57	41.17	42.01	42.20	42.07	41.36	41.54	41.53	42.53	43.95
Al₂O₃	11.65	11.70	11.04	11.09	9.70	11.12	11.12	9.95	10.78	11.76	10.57	11.70	11.71	9.82	10.47	13.86	12.56	12.21	12.71	12.14	12.71	13.17	12.36	11.31
K₂O	0.31	0.38	0.29	0.23	0.29	0.37	0.34	0.29	0.23	0.37	0.22	0.26	0.33	0.21	0.30	0.49	0.57	0.35	0.35	0.51	0.57	0.53	0.41	0.43
MnO	0.29	0.28	0.24	0.26	0.25	0.24	0.27	0.29	0.30	0.27	0.31	0.33	0.32	0.34	0.26	0.34	0.26	0.33	0.29	0.30	0.27	0.25	0.30	0.35
TiO₂	0.32	0.34	0.28	0.30	0.34	0.37	0.27	0.27	0.33	0.34	0.33	0.41	0.41	0.36	0.35	0.35	0.42	0.34	0.38	0.48	0.47	0.36	0.37	0.33
CaO	12.78	12.79	12.82	12.73	12.80	12.72	12.21	12.66	12.66	12.68	12.89	12.61	12.62	12.73	12.91	11.76	11.64	11.49	11.87	11.67	11.79	11.75	11.71	11.81
Na₂O	0.96	0.94	0.93	0.85	0.70	0.89	0.77	0.85	0.90	0.99	0.73	0.86	0.93	0.85	0.85	1.25	1.06	1.15	1.14	1.11	1.08	1.09	1.07	0.95
MgO	8.78	8.72	9.07	9.31	10.20	8.51	9.31	9.80	9.33	8.90	9.48	8.79	8.66	9.82	9.40	6.68	7.28	7.34	7.38	7.52	7.12	7.05	7.40	8.25
TFeO	19.15	19.19	18.07	18.54	17.93	19.44	18.46	18.34	18.90	19.04	18.21	18.80	19.13	18.17	18.78	20.05	19.28	19.35	19.79	19.97	21.94	21.68	21.19	20.13
总计	97.67	97.68	97.39	97.88	97.81	97.25	96.53	97.43	97.65	97.47	97.73	97.39	97.47	97.09	97.89	95.95	95.07	94.78	95.96	95.07	97.49	97.41	97.35	97.50
Mn	0.04	0.04	0.03	0.03	0.03	0.03	0.03	0.04	0.04	0.03	0.04	0.04	0.04	0.04	0.03	0.04	0.03	0.04	0.04	0.04	0.03	0.03	0.04	0.04
Na	0.28	0.27	0.27	0.25	0.20	0.26	0.22	0.25	0.26	0.29	0.21	0.25	0.27	0.25	0.25	0.37	0.32	0.35	0.34	0.33	0.31	0.32	0.31	0.28
Mg	1.96	1.95	2.03	2.06	2.25	1.92	2.08	2.18	2.07	1.99	2.10	1.96	1.94	2.19	2.09	1.53	1.67	1.69	1.68	1.73	1.60	1.59	1.66	1.84
K	0.06	0.07	0.06	0.04	0.05	0.07	0.06	0.06	0.04	0.07	0.04	0.05	0.06	0.04	0.06	0.10	0.11	0.07	0.07	0.10	0.11	0.10	0.08	0.08
Si	6.51	6.50	6.69	6.62	6.76	6.58	6.57	6.71	6.60	6.47	6.70	6.53	6.51	6.71	6.65	6.31	6.48	6.51	6.43	6.39	6.27	6.26	6.40	6.57
Al	2.06	2.07	1.95	1.94	1.69	1.98	1.97	1.75	1.90	2.08	1.86	2.06	2.07	1.73	1.84	2.50	2.28	2.22	2.29	2.21	2.26	2.34	2.19	1.99
Ca	2.05	2.06	2.06	2.03	2.03	2.06	1.96	2.02	2.02	2.04	2.06	2.02	2.03	2.04	2.06	1.93	1.92	1.90	1.94	1.93	1.91	1.90	1.89	1.89
Ti	0.04	0.04	0.03	0.03	0.04	0.04	0.03	0.03	0.04	0.04	0.04	0.05	0.05	0.04	0.04	0.04	0.05	0.04	0.04	0.06	0.05	0.04	0.04	0.04
Fe³⁺	0.41	0.40	0.15	0.40	0.38	0.33	0.62	0.41	0.49	0.47	0.31	0.43	0.44	0.39	0.34	0.46	0.39	0.47	0.49	0.62	0.84	0.83	0.76	0.65
Fe²⁺	1.99	2.01	2.11	1.90	1.84	2.12	1.70	1.88	1.87	1.92	1.96	1.92	1.96	1.89	2.00	2.11	2.09	2.03	2.04	1.96	1.93	1.91	1.91	1.87
Al^IV	1.49	1.50	1.31	1.38	1.24	1.42	1.43	1.29	1.40	1.53	1.30	1.47	1.49	1.29	1.35	1.69	1.52	1.49	1.57	1.61	1.73	1.74	1.60	1.43
Al^VI	0.57	0.57	0.65	0.56	0.46	0.56	0.54	0.46	0.49	0.55	0.55	0.60	0.58	0.45	0.49	0.82	0.76	0.73	0.71	0.60	0.54	0.61	0.59	0.56
Mg/(Mg+Fe)	0.50	0.49	0.49	0.52	0.55	0.47	0.55	0.54	0.53	0.51	0.52	0.51	0.50	0.54	0.51	0.42	0.44	0.45	0.45	0.47	0.45	0.45	0.47	0.50
T/℃	572	585	551	562	582	605	544	542	577	583	579	625	624	594	588	593	634	593	609	675	662	600	601	577
注:以23个O原子为标准计算；钙质角闪石Ti温度计经验公式:T(℃)=389+5098.36Ti(Ti＜0.054)

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表 4 斜长石化学组分电子探针分析结果

Table 4. EPMA results of the plagioclase chemical composition %

样品号	SD203-1				SD203-2					SD203-2
测点号	26	28	29	30	1	2	3	4	5	7	8	9	10	11	12	13	14
SiO₂	60.26	63.95	67.59	61.37	58.89	60.56	59.16	58.74	58.74	60.21	61.98	58.55	64.04	63.82	63.81	59.31	58.38
Al₂O₃	25.54	23.05	21.44	24.51	26.38	25.77	27.02	26.72	26.39	25.28	25.92	26.81	22.89	24.14	23.84	26.37	26.41
K₂O	0.04	0.04	0.06	0.05	0.05	0.09	0.05	0.05	0.04	0.05	0.05	0.04	0.05	0.03	0.06	0.04	0.04
MnO	0.00	0.04	0.00	0.02	0.02	0.02	0.00	0.00	0.00	0.01	0.01	0.00	0.01	0.01	0.00	0.00	0.00
TiO₂	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
CaO	6.55	3.57	3.14	5.74	7.92	6.71	8.10	8.20	7.85	6.69	6.44	8.19	5.41	4.59	4.40	7.57	7.98
Na₂O	7.22	8.97	8.57	7.79	6.59	7.14	6.27	6.46	6.67	7.01	6.68	6.32	7.91	7.38	8.00	6.62	6.49
MgO	0.00	0.02	0.00	0.00	0.00	0.00	0.01	0.00	0.02	0.02	0.00	0.00	0.00	0.00	0.00	0.00	0.00
TFeO	0.04	0.04	0.09	0.20	0.11	0.04	0.08	0.09	0.07	0.04	0.16	0.15	0.10	0.07	0.06	0.23	0.17
总计	99.66	99.68	100.88	99.69	99.98	100.41	100.73	100.26	99.89	99.56	101.24	100.10	100.42	100.23	100.20	100.15	99.48
Si	10.73	11.39	12.04	10.93	10.49	10.79	10.54	10.46	10.46	10.69	11.01	10.40	11.37	11.33	11.33	10.53	10.37
Al	5.36	4.84	4.50	5.15	5.54	5.41	5.67	5.61	5.54	5.29	5.43	5.61	4.79	5.05	4.99	5.52	5.53
Fe	0.01	0.01	0.01	0.03	0.02	0.01	0.01	0.01	0.01	0.01	0.02	0.02	0.01	0.01	0.01	0.03	0.03
Ca	1.25	0.68	0.60	1.10	1.51	1.28	1.55	1.56	1.50	1.27	1.22	1.56	1.03	0.87	0.84	1.44	1.52
Na	2.49	3.10	2.96	2.69	2.27	2.46	2.16	2.23	2.30	2.41	2.30	2.17	2.72	2.54	2.76	2.28	2.24
K	0.01	0.01	0.01	0.01	0.01	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
总计	19.85	20.02	20.12	19.90	19.84	19.97	19.94	19.89	19.82	19.69	19.99	19.78	19.94	19.82	19.94	19.82	19.69
An	33.30	17.96	16.78	28.87	39.79	34.00	41.55	41.10	39.34	34.41	34.61	41.64	27.33	25.51	23.21	38.62	40.33
Ab	66.46	81.80	82.85	70.82	59.91	65.48	58.17	58.63	60.43	65.26	65.05	58.11	72.39	74.27	76.42	61.16	59.41
Or	0.24	0.24	0.38	0.31	0.29	0.52	0.28	0.27	0.23	0.33	0.33	0.25	0.28	0.23	0.38	0.22	0.26
端元	中长石	奥长石	奥长石	奥长石	中长石	中长石	中长石	中长石	中长石	中长石	中长石	中长石	奥长石	奥长石	奥长石	中长石	中长石

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续表4
样品号	SD203-2											SD203-3
测点号	15	21	22	23	24	25	31	32	33	34	35	2	4	5	6	7	8
SiO₂	60.87	63.65	59.91	58.15	63.67	65.11	64.99	62.57	66.74	64.75	66.04	58.45	58.74	58.45	59.36	58.24	58.74
Al₂O₃	25.32	24.00	26.53	27.29	24.48	23.35	23.18	24.94	22.99	23.20	22.76	25.90	26.34	26.54	26.03	26.66	27.26
K₂O	0.04	0.05	0.03	0.04	0.05	0.04	0.04	0.06	0.06	0.06	0.05	0.06	0.05	0.05	0.04	0.04	0.04
MnO	0.01	0.00	0.00	0.01	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.00
TiO₂	0.00	0.01	0.00	0.00	0.02	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.01
CaO	6.38	4.54	7.22	8.68	4.70	3.43	3.49	5.36	3.48	3.56	2.94	7.54	7.59	8.18	7.36	8.12	8.26
Na₂O	7.10	8.44	6.55	6.10	7.92	8.76	8.89	7.85	7.64	8.72	8.83	6.83	6.75	6.32	6.83	6.43	6.26
MgO	0.01	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.01	0.01	0.00	0.01	0.01	0.00	0.00	0.01	0.00
TFeO	0.09	0.07	0.07	0.15	0.08	0.09	0.08	0.11	0.06	0.13	0.07	0.16	0.10	0.11	0.07	0.05	0.08
总计	99.82	100.80	100.38	100.44	100.96	100.79	100.68	100.94	101.01	100.44	100.75	99.78	99.61	99.70	99.71	99.55	100.67
Si	10.81	11.14	10.49	10.18	11.14	11.40	11.37	10.95	11.68	11.33	11.56	10.53	10.59	10.53	10.70	10.50	10.59
Al	5.30	4.95	5.47	5.63	5.05	4.82	4.78	5.14	4.74	4.78	4.69	5.50	5.59	5.64	5.53	5.66	5.79
Fe	0.01	0.01	0.01	0.02	0.01	0.01	0.01	0.02	0.01	0.02	0.01	0.02	0.01	0.02	0.01	0.01	0.01
Ca	1.21	0.85	1.35	1.63	0.88	0.64	0.65	1.01	0.65	0.67	0.55	1.46	1.47	1.58	1.42	1.57	1.59
Na	2.44	2.86	2.22	2.07	2.69	2.97	3.02	2.66	2.59	2.96	3.00	2.39	2.36	2.21	2.39	2.25	2.19
K	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
总计	19.79	19.82	19.55	19.53	19.79	19.85	19.85	19.79	19.69	19.77	19.82	19.91	20.03	19.98	20.05	19.99	20.18
An	33.10	22.86	37.79	43.94	24.61	17.73	17.77	27.33	20.03	18.32	15.50	37.78	38.22	41.57	37.24	41.01	42.06
Ab	66.67	76.86	62.03	55.85	75.06	82.03	81.97	72.33	79.56	81.32	84.18	61.87	61.49	58.11	62.54	58.78	57.68
Or	0.23	0.28	0.18	0.21	0.34	0.24	0.26	0.34	0.41	0.36	0.33	0.35	0.29	0.32	0.22	0.21	0.25
端元	中长石	奥长石	中长石	中长石	奥长石	奥长石	奥长石	奥长石	奥长石	奥长石	奥长石	中长石	中长石	中长石	中长石	中长石	中长石

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样品号	SD203-3					SD204-2					SD204-3
测点号	9	10	21	22	25	21	22	23	24	25	6	7	8	9	10
SiO₂	59.08	59.68	60.08	58.50	62.39	57.90	56.20	58.15	57.48	58.11	59.10	58.92	59.37	59.85	58.97
Al₂O₃	26.90	26.98	25.75	27.11	24.63	26.85	26.86	26.11	27.16	26.27	26.22	27.67	26.55	27.45	25.97
K₂O	0.04	0.03	0.05	0.03	0.04	0.07	0.05	0.06	0.06	0.05	0.04	0.03	0.04	0.02	0.05
MnO	0.01	0.00	0.02	0.00	0.03	0.01	0.01	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.02
TiO₂	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
CaO	7.96	7.68	7.09	8.45	5.21	8.46	8.33	7.84	8.60	7.87	7.66	8.63	7.62	7.86	7.54
Na₂O	6.34	6.20	6.94	6.24	7.79	6.14	6.21	6.36	6.00	6.41	6.84	6.33	6.68	6.49	6.72
MgO	0.00	0.00	0.01	0.00	0.01	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.01	0.00	0.00
TFeO	0.06	0.11	0.11	0.13	0.08	0.13	0.09	0.18	0.19	0.15	0.14	0.14	0.10	0.13	0.17
总计	100.39	100.76	100.07	100.47	100.18	99.60	97.77	98.75	99.50	98.90	100.03	101.76	100.39	101.84	99.45
Si	10.65	10.75	10.83	10.54	11.24	10.39	10.08	10.43	10.31	10.42	10.60	10.57	10.65	10.73	10.58
Al	5.71	5.73	5.47	5.76	5.23	5.67	5.68	5.52	5.74	5.55	5.54	5.85	5.61	5.80	5.49
Fe	0.01	0.02	0.02	0.02	0.01	0.02	0.01	0.03	0.03	0.02	0.02	0.02	0.01	0.02	0.03
Ca	1.54	1.48	1.37	1.63	1.01	1.63	1.60	1.51	1.65	1.51	1.47	1.66	1.46	1.51	1.45
Na	2.21	2.16	2.42	2.18	2.72	2.13	2.16	2.21	2.09	2.23	2.38	2.20	2.32	2.26	2.34
K	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
总计	20.13	20.16	20.12	20.14	20.22	19.85	19.54	19.71	19.83	19.75	20.02	20.30	20.07	20.33	19.89
An	40.90	40.58	35.98	42.71	26.92	43.06	42.45	40.39	44.01	40.31	38.15	42.87	38.56	40.03	38.17
Ab	58.88	59.22	63.72	57.08	72.85	56.55	57.24	59.27	55.62	59.41	61.64	56.97	61.22	59.83	61.55
Or	0.23	0.20	0.31	0.20	0.23	0.39	0.31	0.34	0.37	0.28	0.21	0.16	0.22	0.15	0.28
端元	中长石	中长石	中长石	中长石	奥长石	中长石	中长石	中长石	中长石	中长石	中长石	中长石	中长石	中长石	中长石
注：以6个O原子为基准计算的阳离子

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表 5 赣南上洞变玄武岩主量元素分析结果

Table 5. Analysis results of major elements for the meta-basalt from Shangdong, southern Jiangxi %

样品号	SD201	SD202	SD203	SD204	SD205	SD206	SD207	SD208	SD209
SiO₂	48.33	48.06	47.45	49.17	48.85	49.49	49.33	48.40	48.89
Al₂O₃	14.05	14.46	14.31	14.14	14.09	14.59	14.45	14.24	14.05
MgO	6.01	5.83	6.06	5.75	5.80	5.37	5.53	5.90	6.33
Na₂O	2.84	2.82	2.69	2.59	2.52	2.61	2.23	3.01	2.85
K₂O	0.38	0.43	0.43	0.25	0.24	0.24	0.27	0.38	0.20
P₂O₅	0.24	0.24	0.25	0.24	0.24	0.27	0.25	0.22	0.20
TiO₂	2.35	2.37	2.39	2.39	2.39	2.24	2.19	2.34	2.14
CaO	9.73	10.04	10.06	9.98	10.09	9.93	10.73	9.71	10.53
TFe₂O₃	14.73	14.46	14.95	14.39	14.39	14.11	13.78	14.75	13.71
MnO	0.21	0.21	0.22	0.21	0.21	0.20	0.20	0.20	0.20
Mg^#	42.09	41.80	41.93	41.62	41.81	40.44	41.71	41.60	45.16
烧失量	0.52	0.70	0.53	0.59	0.57	0.47	0.48	0.46	0.48
总计	99.41	99.63	99.34	99.69	99.38	99.52	99.44	99.62	99.58
注：Mg^#=100×Mg/(Mg+Fe²⁺)

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表 6 赣南上洞变玄武岩稀土和微量元素分析结果测试数据

Table 6. Analysis results of rare earth elements and trace elements in the Shangdong meta-basalt, Southern Jiangxi 10⁻⁶

元素	SD201	SD202	SD203	SD204	SD205	SD206	SD207	SD208	SD209
Li	35.38	40.94	35.27	38.61	43.66	48.88	44.08	51.19	32.02
Be	0.90	0.81	0.78	0.93	0.91	1.03	1.09	0.80	0.73
Sc	38.49	37.24	38.67	38.26	37.46	35.36	35.70	37.98	40.05
Ti	14338.44	14148.33	14108.69	14475.53	14308.72	13204.30	12999.82	14008.60	12773.29
V	340.93	321.51	326.29	342.59	338.60	322.67	314.12	367.51	332.18
Cr	70.96	68.73	74.19	79.14	68.24	57.77	62.42	60.11	90.28
Mn	1708.11	1689.67	1725.69	1738.04	1735.50	1632.46	1671.34	1639.71	1635.38
Co	44.91	43.26	44.91	44.87	45.30	42.15	41.36	44.36	44.93
Ni	43.51	41.56	41.96	48.57	45.11	39.46	40.93	47.02	51.84
Cu	53.41	55.91	47.90	71.31	65.91	65.53	59.49	92.60	63.99
Zn	126.06	121.42	126.54	127.00	123.30	120.38	114.27	117.74	110.26
Ga	20.78	20.67	20.69	21.79	21.55	22.15	23.02	20.89	19.89
Rb	38.12	42.44	41.40	14.19	13.29	14.08	20.99	27.66	7.18
Sr	241.92	245.27	234.00	255.28	254.61	262.56	250.01	266.26	188.66
Y	32.94	32.87	34.01	34.60	34.61	36.55	35.42	30.61	29.00
Zr	159.03	155.99	157.02	177.93	174.48	189.97	179.03	140.25	134.62
Nb	11.38	11.43	11.51	12.43	12.08	12.88	12.51	10.37	9.51
Mo	0.73	0.74	0.64	1.01	0.85	0.74	0.71	0.59	0.89
Sn	1.38	1.29	1.28	1.63	1.65	1.64	1.75	1.14	1.17
Cs	48.25	23.55	58.69	24.92	11.41	19.32	5.54	61.42	5.22
Ba	95.86	94.51	109.74	62.74	67.57	62.87	50.30	100.26	30.17
Hf	3.85	3.81	3.82	4.29	4.23	4.54	4.33	3.45	3.31
Ta	0.64	0.64	0.64	0.70	0.69	0.73	0.70	0.57	0.53
W	0.64	0.88	0.54	0.59	0.46	0.48	0.78	0.79	0.69
Tl	0.29	0.28	0.27	0.19	0.14	0.14	0.19	0.21	0.10
Pb	1.82	1.72	1.46	2.02	2.04	2.01	1.83	1.90	2.12
Th	1.31	1.29	1.29	1.46	1.44	1.55	1.47	1.13	1.01
U	0.38	0.40	0.39	0.44	0.42	0.44	0.43	0.32	0.29
La	11.11	11.20	11.32	12.27	12.19	12.94	12.85	10.37	9.23
Ce	26.71	27.10	27.19	29.68	29.34	31.25	30.65	24.87	22.18
Pr	4.06	4.10	4.14	4.43	4.42	4.72	4.57	3.77	3.41
Nd	19.13	19.23	19.66	20.81	20.68	21.98	21.20	17.91	16.09
Sm	5.15	5.15	5.32	5.55	5.51	5.85	5.67	4.88	4.45
Eu	1.88	1.93	1.96	2.03	1.98	2.07	2.16	1.85	1.72
Gd	5.76	5.75	5.90	6.12	6.10	6.41	6.27	5.47	5.06
Tb	0.97	0.97	1.00	1.03	1.03	1.09	1.06	0.92	0.86
Dy	5.79	5.77	5.94	6.16	6.18	6.54	6.39	5.50	5.20
Ho	1.18	1.19	1.21	1.26	1.26	1.33	1.30	1.12	1.07
Er	3.37	3.37	3.44	3.61	3.59	3.79	3.68	3.16	3.02
Tm	0.45	0.45	0.46	0.48	0.48	0.51	0.50	0.42	0.41
Yb	2.84	2.79	2.85	3.04	3.06	3.21	3.11	2.63	2.53
Lu	0.42	0.42	0.42	0.45	0.45	0.47	0.46	0.39	0.38
∑REE	88.82	89.40	90.80	96.93	96.28	102.17	99.86	83.28	75.61
∑LREE	68.03	68.71	69.59	74.77	74.13	78.81	77.10	63.66	57.08
∑HREE	20.79	20.69	21.21	22.16	22.15	23.36	22.76	19.62	18.53
LREE/HREE	3.27	3.32	3.28	3.37	3.35	3.37	3.39	3.25	3.08
(La/Yb)_N	2.66	2.73	2.70	2.75	2.71	2.74	2.81	2.68	2.48
(La/Sm)_N	1.35	1.36	1.33	1.38	1.38	1.38	1.41	1.33	1.30
La/Yb	3.91	4.01	3.98	4.04	3.99	4.03	4.13	3.95	3.64
δEu	1.05	1.08	1.06	1.06	1.04	1.03	1.11	1.09	1.10
δCe	0.96	0.96	0.95	0.97	0.96	0.96	0.96	0.96	0.95
注: δEu=Eu/Eu*=Eu_N/((Sm_N+Gd_N)/2)

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