九州−帕劳脊南段基底玄武岩的单斜辉石矿物化学及成因意义

刘振轩; 鄢全树; 刘焱光; 杨刚; 石学法

doi:10.12284/hyxb2023071

九州−帕劳脊南段基底玄武岩的单斜辉石矿物化学及成因意义

doi: 10.12284/hyxb2023071

刘振轩^1,,
鄢全树^{1, 2, 3, ,},
刘焱光^{1, 2, 3},
杨刚^{1, 2},
石学法^{1, 2, 3}

1.
自然资源部第一海洋研究所海洋地质与成矿作用重点实验室，山东青岛 266061
2.
崂山实验室海洋地质与环境功能实验室，山东青岛 266061
3.
山东省深海矿产资源开发重点实验室，山东青岛 266061

基金项目: 崂山实验室“十四五”重大项目(2022QNLM050201-3)；国家重点研发计划(2017YFC1405502)；国家自然科学基金(41322036)；山东省泰山学者建设工程项目。

详细信息

作者简介:
刘振轩（1995-），男，甘肃省天水市人，主要从事海底岩石地球化学方面研究。 E-mail：zxliu@fio.org.cn

通讯作者:
鄢全树，男，研究员，博士，主要从事海底岩浆活动与构造演化方面研究。E-mail：qsyan@fio.org.cn

中图分类号: P575.3;P581
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出版历程
- 收稿日期: 2022-10-26
- 修回日期: 2022-12-15
- 网络出版日期: 2023-06-15
- 刊出日期: 2023-06-30

Mineral chemistry and genetic significance of clinopyroxenes in the basement basalts from the southern Kyushu-Palau Ridge

Liu Zhenxuan^1
,,
Yan Quanshu^{1, 2, 3
, ,},
Liu Yanguang^{1, 2, 3},
Yang Gang^{1, 2},
Shi Xuefa^{1, 2, 3}

1.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory of Marine Geology, Laoshan Laboratory, Qingdao 266061, China
3.
Key Laboratory of Deep Sea Mineral Resources Development, Shandong (preparatory), Qingdao 266061, China

摘要

摘要: 九州−帕劳脊是古伊豆−小笠原−马里亚纳弧的重要组成，对其上基底岩石开展矿物学和岩石学研究可为理解洋内岛弧演化早期的岩石成因和岩浆活动特点提供重要线索。本文对九州−帕劳脊南段基底玄武岩中的单斜辉石斑晶和微晶开展详细的岩相学和原位主微量元素分析，结果表明，单斜辉石斑晶与微晶整体上具有相似的化学组分，为普通辉石及透辉石等种属，且亏损轻稀土元素，Eu负异常不明显。多数单斜辉石斑晶具有环带结构，可划分为简单环带及韵律性环带两类；从辉石核部到边部，MgO、FeO、Al₂O₃、TiO₂含量与核部镁指数Mg#等呈现复杂的高低变化，指示了多期次的岩浆混合与补给事件。单斜辉石的结晶温度、压力分别为1 151～1 210℃和1.3×10⁸～4.2×10⁸ Pa。通过单斜辉石组分反演获得的母岩浆含水量为0.8%～2.3%（以湿质量计）。最后，我们提出，形成于典型的洋内岛弧背景下的九州−帕劳脊南段熔岩的母岩浆为亚碱性岛弧拉斑玄武质熔体，具有高温、中压、高氧逸度的特征，岩浆房深度较浅并存在多期次原始岩浆的补给和混合。
- 单斜辉石 /
- 矿物化学 /
- 环带结构 /
- 岩浆过程 /
- 岛弧玄武岩 /
- 九州−帕劳脊
Abstract: The Kyushu-Palau ridge (KPR) is an important part of the proto-Izu-Bonin-Mariana arc. The mineralogical and petrological studies of the arc basement rocks can provide significant insights for understanding the petrogenesis and magmatism characteristics of the early stage of intra-oceanic island arc evolution. In this paper, we performed petrographic and detailed mineral geochemical analyses including in situ major-trace elements of clinopyroxene (Cpx) phenocrysts and microcrystals from the basement basalts from the southern KPR. The results show that clinopyroxenes are mainly augites and diopside, which generally have similar chemical components for the phenocrysts and microcrystals. These clinopyroxenes are depleted in light rare earth elements with weak Eu negative anomalies. Most of the Cpx macrocrysts display zoning structures, which can be classified into basic and oscillatory zoning. The MgO, FeO, Al₂O₃, TiO₂ and Mg# contents show complex high-low variations from the pyroxene core to the rim, indicating multi-period magma mixing and replenishment events. The crystallization temperature and pressure of Cpx phenocrysts are 1 151−1210℃ and 1.3×10⁸−4.2×10⁸ Pa, respectively. In addition, the water content of parent magma obtained by the inversion calculated from Cpx components is 0.8%−2.3% (wet weight). Conclusively, we suggested that the parent magma of the southern KPR lavas that formed within a typical intra-oceanic island-arc setting is a sub-alkaline island-arc tholeiite basaltic melt with high temperature, medium pressure, and high oxygen fugacity. The magma chambers were shallow in depth and there existed multi-period replenishment and mixing of primitive magma.
- clinopyroxene /
- mineral chemistry /
- zoning structure /
- magmatic process /
- island-arc basalt /
- Kyushu-Palau Ridge

HTML全文

图 1 九州−帕劳脊及邻近地区地质单元图及取样站位（CJ09-123）位置

Fig. 1 Geologic map and sampling station (CJ09-123) of the Kyushu-Palau Ridge and the adjacent area

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图 2 九州−帕劳脊南段玄武岩及主要矿物岩相学特征

a. CJ09-123-3-1样品正交偏光镜下图像，可见单斜辉石斑晶及斜长石斑晶，斜长石内部有熔蚀结构，部分单斜辉石裂理发育；b和c. 样品中典型矿物斑晶及微晶的背散射电子（BSE）图像，可见单斜辉石斑晶内部明暗相间分布的环带结构，局部有熔蚀痕迹，矿物微晶无明显颜色及环带变化。cpx：单斜辉石；pl：斜长石

Fig. 2 Petrographic characteristics of the basalt in the KPR and the major minerals phenocrysts

a. Photomicrographs showing clinopyroxene and resorption textures of plagioclase phenocrysts in sample CJ09-123-3-1（crossed polarized light）, some Cpx phenocrysts showing cleavage structure; b and c. the backscattered electron （BSE） images of the typical mineral phenocrysts and microcrystals in the sample, the cpx phenocrysts have alternately dark and bright zones with local resorption texture, the cpx microcrystals show no distinct color and zoned variations. cpx: clinopyroxene, pl: plagioclase

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图 3 本研究辉石的三段元分类图（底图据文献[35]）

Fig. 3 Wo-En-Fs nomenclature of studied pyroxene crystals (based on reference [35])

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图 4 九州−帕劳脊南段代表性单斜辉石背散射图像及剖面成分特征

a. 代表性深色核部单斜辉石；b. 代表性浅色核部单斜辉石；c. 具有韵律性复杂环带的单斜辉石斑晶CJ09-123-5；d. 简单环带辉石剖面元素变化；e. 复杂环带辉石剖面元素变化。图像中红线指示测试剖面

Fig. 4 Compositional profiles for the major elements and backscattered electron （BSE） images of representative pyroxene phenocrysts from the southern KPR

a. Representative cpx with dark core; b. representative cpx with bright core; c. the cpx named CJ09-123-5 with complex rhythmically zoning; d. variation of important elements in the sections of simple zoned clinopyroxenes; e. variation of important elements in the section of complex zoned clinopyroxene. The red lines in the images indicate the test sections

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图 5 CJ09-123站位玄武岩中单斜辉石稀土元素球粒陨石标准化图解

球粒陨石数据源于文献[37]

Fig. 5 Chondrite-normalized REE patterns of the clinopyroxenes in basalt from Site CJ09-123

CI chondrite values cited from reference [37]

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图 6 岩浆系列判别图解

a. 单斜辉石Si-Al关系图（据文献[42]；b. 单斜辉石Ti-Ca+Na图解；c. 单斜辉石Ti-Al图解（据文献[38]）；d.单斜辉石Al₂O₃-SiO₂图解（据文献[41]）；图a−c中各元素含量以单位分子原子数（apfu）表示，图d中以湿质量百分比表示

Fig. 6 Discriminant diagrams of magma series

a. Si-Al diagram of Clinopyroxenes (from reference [42]);b. Ca + Na vs. Ti; c. Ti vs. Al(total) diagrams (from reference [38]); d. Al₂O₃ vs. SiO₂ diagram of Clinopyroxenes (from reference [41]). The contents of each elements are expressed in terms of atoms per formula unit (apfu) in figures a-c, and in terms of wet mass percentage in figure d

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图 7 单斜辉石化学组分成分协变图

Fig. 7 Chemical compositional variations for clinopyroxenes phenocrysts

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图 8 单斜辉石‒熔体平衡对分布图

图a中灰色区域代表平衡区间，寄主全岩Mg#值为67.1（未发表数据）；图b‒d中虚线及黑色细线分别指示1σ和2σ；DiHd（透辉石+钙铁辉石），EnFs（顽辉石+斜铁辉石），CaTs（钙契尔马克分子）

Fig. 8 Diagrams of clinopyroxene-melt pairs in equilibrium conditions

a. Comparison of measured Mg# values of Cpx phenocrysts and their host whole-rocks. Gray fields define the equilibrium curves between Cpx and melt. The Mg# value of the host whole-rock is 67.1（unpublished data）. Fig. b‒d are plots of the predicted compositions （DiHd） of Cpx compared to the observed compositions. The dashed lines and the thin black lines indicate 1σ and 2σ, respectively. DiHd = diopside + hedenbergite, EnFs = enstatite + ferrosilite and CaTs = Ca-Tschermak

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图 9 单斜辉石结晶压力判别图

图a 中Al^IV-Al^VI界线据文献[65]；图b中X_pt、Y_pt计算公式分别为：X_pt = 0.446SiO₂ + 0.187TiO₂ ‒ 0.404Al₂O₃ + 0.346FeO ‒ 0.052MnO + 0.309MgO + 0.431CaO ‒ 0.446Na₂O; Y_pt = ‒0.369SiO₂ + 0.535TiO₂ ‒ 0.317Al₂O₃ + 0.323FeO +0.235MnO ‒ 0.516MgO ‒ 0.167CaO ‒ 0.153Na₂O；图中相关界线据文献[59]；apfu: 单位分子原子数

Fig. 9 Determination of crystallization pressures of studied clinopyroxenes

a. Al^IV vs. Al^VI diagram for Cpx （from reference [65]）; b. X_pt-Y_pt diagram of clinopyroxene crystallization P-T conditions （from reference [10], X_pt = 0.446SiO₂ + 0.187TiO₂ ‒ 0.404Al₂O₃ + 0.346FeO ‒ 0.052MnO + 0.309MgO + 0.431CaO ‒ 0.446Na₂O; Y_pt = ‒0.369SiO₂ + 0.535TiO₂ ‒ 0.317Al₂O₃ + 0.323FeO +0.235MnO ‒ 0.516MgO ‒ 0.167CaO ‒ 0.153Na₂O）. apfu: atoms per formula unit

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图 10 单斜辉石氧逸度判别图

图中氧逸度平衡界线据文献[66]；apfu: 单位分子原子数

Fig. 10 Discrimination for oxygen fugacity of clinopyroxenes components

Na + Al^IV vs. Al^VI + 2Ti + Cr diagram for the pyroxenes (from reference [66]). apfu: atoms per formula unit

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图 11 单斜辉石化学组分构造背景判别图解

图a中WPA：板内碱性玄武岩，WPT：板内拉斑玄武岩，VAB：火山弧玄武岩，OFB：洋底玄武岩，F1、F2计算公式据文献[40]；图b底图资料据文献[69]；apfu: 单位分子原子数

Fig. 11 Tectonic discrimination diagrams of clinopyroxenes components

a. F1 vs. F2 discriminant diagram (from reference [40]) (WPA = Within-Plate Alkali basalt, WPT = Within-Plate Tholeiitic basalt, VAB = Volcanic Arc Basalt, OFB = Ocean Floor Basalt); b. Si vs. Fe diagram for the clinopyroxenes of volcanic rocks from different structural backgrounds (from reference [69]). apfu: atoms per formula unit

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表 1 九州−帕劳脊南段基底玄武岩中单斜辉石主要氧化物含量

Tab. 1 Major oxides contents of clinopyroxenes from the southern KPR basalt

样品编号	分析点位	氧化物含量/%
样品编号	分析点位	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	NiO	Cr₂O₃	CaO	Na₂O	K₂O	总量	Wo	En	Fs
123px-1	c	52.97	0.27	2.14	6.29	0.20	16.81	0.00	0.81	20.36	0.23	0.00	100.08	41.35	47.51	10.28
	m	52.37	0.26	2.41	6.74	0.29	16.00	0.05	0.41	21.01	0.25	0.00	99.80	42.70	45.23	11.15
	r	52.50	0.19	2.43	5.89	0.15	16.62	0.06	0.30	21.49	0.19	0.00	99.82	43.28	46.57	9.47

123px-2	c	51.89	0.39	2.15	9.09	0.39	15.39	0.17	0.10	20.33	0.28	0.00	100.19	40.97	43.15	14.85
	m	52.19	0.05	2.97	4.22	0.15	16.73	0.03	1.34	21.99	0.19	0.00	99.85	44.85	47.49	6.94
	r	52.12	0.29	2.42	6.53	0.26	16.31	0.10	0.69	20.85	0.23	0.00	99.80	42.33	46.08	10.74

123px-3	c	52.10	0.41	1.70	9.53	0.47	14.91	0.00	0.05	20.36	0.26	0.00	99.80	41.25	42.02	15.77
	c	52.44	0.40	1.74	9.56	0.32	14.90	0.02	0.08	20.03	0.30	0.00	99.80	40.87	42.30	15.73
	m	52.45	0.27	2.61	6.13	0.28	16.79	0.05	0.88	20.12	0.22	0.00	99.80	41.16	47.79	10.23
	r	52.07	0.31	2.75	7.09	0.27	16.35	0.02	0.39	20.32	0.23	0.00	99.80	41.29	46.21	11.65
123px-4	m	52.17	0.25	3.05	6.28	0.14	15.79	0.05	0.44	21.86	0.20	0.00	100.22	44.43	44.66	10.17
	m	51.62	0.20	3.22	6.36	0.16	15.61	0.11	0.46	21.57	0.20	0.00	99.51	44.27	44.57	10.43
	c	52.73	0.19	2.86	3.81	0.00	16.84	0.04	0.80	22.37	0.16	0.00	99.80	45.60	47.76	6.07
	c	51.84	0.25	3.26	5.55	0.22	15.91	0.00	0.62	21.91	0.23	0.00	99.80	44.75	45.22	9.19
	r	52.19	0.18	2.82	4.68	0.12	16.83	0.05	0.95	21.84	0.14	0.00	99.80	44.33	47.55	7.60
	r	52.48	0.37	2.40	6.90	0.28	16.34	0.06	0.69	20.34	0.26	0.00	100.11	41.40	46.27	11.40
	r	52.71	0.13	2.48	5.34	0.26	17.66	0.04	0.83	20.17	0.20	0.00	99.80	40.78	49.67	8.83
	r	52.30	0.23	2.57	7.45	0.29	16.28	0.00	0.57	19.91	0.22	0.00	99.80	40.64	46.23	12.31
	r	52.09	0.25	3.04	6.73	0.16	15.33	0.00	0.39	21.59	0.22	0.00	99.80	44.35	43.81	11.03

123px-5	c	53.06	0.08	2.20	3.78	0.17	17.61	0.00	0.71	22.03	0.15	0.00	99.80	44.15	49.10	6.18
	r	52.48	0.29	2.54	6.57	0.35	16.05	0.08	0.50	20.65	0.28	0.00	99.80	42.25	45.67	11.06
	c	52.41	0.17	2.61	5.25	0.12	16.14	0.00	1.16	21.75	0.19	0.00	99.80	44.63	46.07	8.61
	c	52.56	0.10	2.63	5.16	0.18	16.34	0.03	0.96	21.87	0.17	0.00	100.00	44.57	46.33	8.49
	c	51.90	0.20	3.11	4.87	0.20	16.55	0.00	1.00	21.82	0.11	0.00	99.75	44.55	46.99	8.05
	c	53.83	0.04	1.72	4.05	0.18	17.37	0.00	0.89	21.76	0.16	0.00	99.99	43.94	48.79	6.67
	c	52.05	0.14	1.83	3.81	0.18	17.12	0.00	3.32	21.15	0.18	0.00	99.80	43.69	49.20	6.44
	c	53.61	0.10	1.81	4.16	0.14	17.13	0.06	0.90	21.86	0.11	0.00	99.88	44.37	48.38	6.84
	m	53.02	0.07	2.01	5.27	0.12	16.53	0.02	0.79	21.73	0.23	0.00	99.80	44.03	46.60	8.53
	m	52.01	0.13	3.17	6.34	0.28	15.85	0.00	0.47	21.38	0.18	0.00	99.80	43.71	45.09	10.54
	m	52.28	0.31	2.92	6.98	0.18	15.61	0.08	0.40	20.81	0.23	0.00	99.80	42.88	44.76	11.52
	m	51.82	0.21	2.97	6.52	0.25	15.55	0.01	0.52	21.47	0.19	0.00	99.50	44.07	44.41	10.83
	m	52.28	0.25	3.05	6.59	0.20	15.33	0.00	0.41	21.55	0.15	0.00	99.81	44.47	44.02	10.95
	m	52.17	0.23	2.93	6.45	0.29	15.77	0.07	0.43	21.57	0.16	0.00	100.07	43.98	44.71	10.71
	m	51.47	0.29	2.96	6.53	0.26	15.60	0.00	0.64	21.89	0.16	0.00	99.80	44.53	44.13	10.74
	m	51.72	0.17	3.12	7.10	0.29	15.42	0.00	0.55	21.27	0.18	0.00	99.82	43.59	43.96	11.78
	m	50.04	0.15	2.74	6.80	0.23	14.94	0.06	4.47	20.61	0.19	0.00	100.23	43.64	44.04	11.61
	m	51.73	0.22	2.72	6.00	0.25	15.68	0.00	0.37	21.64	0.17	0.00	98.77	44.49	44.85	10.01
	m	51.94	0.28	2.66	6.26	0.16	15.89	0.09	1.17	21.12	0.23	0.00	99.80	43.41	45.43	10.29
	m	52.33	0.28	2.67	6.30	0.22	16.34	0.03	0.48	21.41	0.26	0.00	100.32	43.08	45.76	10.20
	m	51.68	0.27	3.06	6.31	0.30	15.74	0.00	0.50	21.84	0.19	0.00	99.88	44.37	44.49	10.44
	r	53.70	0.05	1.42	3.98	0.23	18.04	0.05	0.68	21.55	0.10	0.00	99.80	43.00	50.08	6.56
	r	53.95	0.15	1.69	3.59	0.11	17.61	0.00	0.80	21.64	0.15	0.00	99.70	43.89	49.70	5.87
	r	53.73	0.06	1.83	3.96	0.17	17.75	0.03	0.70	21.62	0.10	0.00	99.94	43.49	49.67	6.48
	r	53.67	0.06	1.95	3.86	0.09	17.85	0.05	0.85	21.74	0.10	0.00	100.23	43.62	49.83	6.20
	r	53.75	0.12	2.08	4.45	0.16	17.57	0.00	0.45	21.11	0.12	0.00	99.80	42.75	49.52	7.30
123px-5	r	53.39	0.11	2.30	4.75	0.19	17.41	0.15	0.35	21.17	0.12	0.00	99.95	42.78	48.97	7.82
	r	53.00	0.05	2.56	4.80	0.20	16.94	0.09	0.49	21.94	0.10	0.00	100.15	44.24	47.54	7.87
	r	52.25	0.18	3.37	5.34	0.18	16.08	0.03	0.57	22.08	0.20	0.00	100.28	44.95	45.56	8.75
	r	53.63	0.09	2.08	4.32	0.15	17.09	0.07	0.69	21.49	0.19	0.00	99.80	43.76	48.42	7.12
	r	52.82	0.27	2.06	6.90	0.30	16.58	0.14	0.29	20.29	0.19	0.00	99.84	41.13	46.77	11.40
	r	51.22	0.23	1.89	6.80	0.36	16.40	0.00	3.11	19.59	0.19	0.00	99.80	40.54	47.21	11.55
	r	52.53	0.19	2.15	6.24	0.31	16.97	0.13	0.52	20.19	0.27	0.00	99.51	40.87	47.80	10.33
	r	53.12	0.20	2.27	5.84	0.26	16.76	0.00	0.78	20.41	0.26	0.00	99.89	41.69	47.63	9.74
	r	52.91	0.18	1.96	6.73	0.19	16.89	0.00	0.76	19.92	0.27	0.00	99.80	40.40	47.66	10.96
	r	52.63	0.25	2.17	6.90	0.15	16.40	0.10	0.37	20.60	0.23	0.00	99.80	41.77	46.26	11.14
	r	52.42	0.26	2.39	6.95	0.25	15.99	0.03	0.46	20.79	0.26	0.00	99.80	42.32	45.29	11.43
	r	52.42	0.27	2.33	7.16	0.28	16.02	0.00	0.39	20.69	0.24	0.00	99.80	42.05	45.29	11.80
	r	52.25	0.30	2.48	7.12	0.20	15.71	0.05	0.51	20.95	0.23	0.00	99.80	42.82	44.66	11.68

123px-6	r	52.56	0.21	2.06	6.43	0.27	17.18	0.03	0.80	20.10	0.24	0.00	99.88	40.48	48.15	10.51
	m	52.03	0.19	3.05	4.66	0.25	16.78	0.10	0.90	21.56	0.22	0.00	99.73	43.88	47.53	7.77
	c	52.49	0.14	2.53	6.06	0.22	16.98	0.05	0.51	20.65	0.16	0.00	99.80	41.75	47.76	9.90
	r	52.10	0.23	2.17	6.24	0.23	16.49	0.15	0.84	21.12	0.22	0.00	99.80	42.68	46.35	10.17

123px-7	r	52.75	0.30	2.51	6.21	0.27	16.40	0.00	0.84	20.74	0.26	0.00	100.27	42.26	46.49	10.32
	m	51.88	0.34	2.30	8.64	0.25	15.13	0.18	0.00	20.79	0.21	0.00	99.71	42.30	42.85	14.08
	m	51.29	0.17	3.68	6.27	0.22	15.41	0.00	0.83	21.64	0.18	0.00	99.68	44.65	44.23	10.44
	c	53.24	0.17	2.15	5.28	0.15	17.04	0.02	0.29	21.59	0.10	0.00	100.05	43.42	47.69	8.52
	r	52.06	0.21	2.77	6.43	0.17	16.55	0.04	1.18	20.17	0.23	0.00	99.80	41.37	47.22	10.55

123px-8	c	52.38	0.13	2.76	4.24	0.17	16.64	0.00	1.29	21.78	0.22	0.00	99.61	44.65	47.46	7.06
	m	51.86	0.26	2.75	7.47	0.31	15.42	0.01	0.28	21.19	0.24	0.00	99.80	43.12	43.65	12.33
	m	52.38	0.13	3.00	4.46	0.16	16.82	0.00	1.25	21.64	0.18	0.00	100.01	44.19	47.78	7.36
	r	52.26	0.26	2.36	6.37	0.22	16.80	0.07	0.79	20.42	0.25	0.00	99.80	41.36	47.33	10.38

123px-9	r	53.30	0.16	1.93	5.48	0.20	17.48	0.09	0.65	20.60	0.18	0.00	100.08	41.47	48.95	8.94
	c	52.01	0.35	1.95	8.42	0.39	15.92	0.02	0.20	20.29	0.26	0.00	99.80	40.78	44.53	13.77
	m	53.24	0.15	1.92	5.36	0.23	17.59	0.00	0.45	20.59	0.19	0.00	99.71	41.37	49.19	8.76

123px-10	c	51.93	0.35	2.27	9.33	0.34	15.20	0.00	0.04	20.02	0.28	0.00	99.75	40.68	42.98	15.29
	m	53.37	0.16	2.54	4.57	0.19	16.85	0.06	0.79	21.66	0.19	0.00	100.37	44.05	47.70	7.57
	m	52.18	0.36	2.07	8.65	0.24	15.14	0.10	0.06	20.66	0.33	0.00	99.80	41.96	42.79	14.06
	r	52.18	0.20	2.36	6.49	0.23	16.67	0.00	0.66	20.74	0.23	0.00	99.76	41.83	46.77	10.55
123px-b1	b	52.73	0.26	2.09	6.39	0.25	16.89	0.07	0.72	20.04	0.21	0.00	99.64	40.81	47.86	10.55
	b	53.02	0.23	1.83	7.10	0.27	17.03	0.00	0.52	19.76	0.19	0.00	99.95	39.88	47.82	11.60

123px-b2	b	48.23	0.20	2.10	6.29	0.31	15.15	0.08	8.33	18.86	0.23	0.02	99.80	41.45	46.33	11.31
	b	52.21	0.22	2.09	6.63	0.21	16.55	0.05	1.49	20.12	0.24	0.00	99.80	41.14	47.08	10.91

123px-b3	b	52.72	0.27	2.22	6.20	0.23	16.65	0.14	0.86	20.56	0.23	0.00	100.07	41.82	47.12	10.21
	b	51.85	0.26	2.80	6.94	0.23	16.09	0.11	0.88	20.42	0.22	0.00	99.80	41.85	45.88	11.44
	b	51.29	0.33	2.26	5.88	0.25	16.19	0.07	4.24	19.62	0.20	0.00	100.33	41.48	47.64	10.14
注：c代表斑晶核部，m代表斑晶幔部，r代表斑晶边部，b代表矿物微晶。

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表 2 单斜辉石的稀土元素分析结果

Tab. 2 LA-ICPMS results for rare earth elements of pyroxene phenocrysts from the southern Kyushu-Palau ridge basalt

测点号	矿物类型	位置	稀土元素含量/10⁻⁶
测点号	矿物类型	位置	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	∑REE	LREE/ HREE	δEu
123px-1-1	斑晶	r	0.10	0.83	0.21	1.71	1.14	0.33	1.59	0.27	2.04	0.48	1.21	0.20	1.31	0.18	11.60	0.59	0.76
123px-1-2	斑晶	m	0.28	1.80	0.47	3.63	2.34	0.72	2.65	0.61	3.83	0.77	2.29	0.34	1.99	0.28	22.00	0.72	0.88
123px-1-3	斑晶	c	0.10	0.72	0.20	1.92	0.77	0.27	1.75	0.26	1.75	0.36	1.08	0.12	0.94	0.17	10.40	0.62	0.69
123px-2-1	斑晶	−	0.37	2.70	0.68	6.31	3.61	1.18	6.42	1.14	7.67	1.55	4.47	0.57	4.52	0.54	41.73	0.55	0.74
123px-2-2	斑晶	−	0.16	1.03	0.25	2.01	1.05	0.37	1.83	0.34	2.75	0.46	1.61	0.23	1.16	0.16	13.39	0.57	0.80
123px-3-1	斑晶	c	0.24	1.80	0.55	4.10	2.29	0.74	3.18	0.71	4.62	1.08	2.64	0.32	2.59	0.34	25.21	0.63	0.84
123px-3-2	斑晶	m	0.08	0.38	0.10	0.72	0.20	0.17	0.87	0.17	0.82	0.22	0.57	0.05	0.50	0.07	4.92	0.51	1.06
123px-3-3	斑晶	r	0.16	1.01	0.24	2.26	1.14	0.37	1.58	0.35	2.41	0.58	1.48	0.24	1.44	0.14	13.41	0.63	0.84
123px-4-1	斑晶	c	0.12	0.79	0.20	1.74	0.79	0.25	1.11	0.24	1.79	0.25	1.02	0.09	0.56	0.13	9.09	0.75	0.82
123px-4-2	斑晶	m	0.03	0.37	0.10	0.62	0.33	0.18	0.44	0.10	0.92	0.18	0.37	0.01	0.43	0.09	4.18	0.65	1.44
123px-4-3	斑晶	r	0.20	0.97	0.29	2.41	0.96	0.44	1.97	0.34	2.55	0.51	1.63	0.20	1.22	0.25	13.93	0.61	0.95
123px-5-1	斑晶	c	0.14	0.79	0.24	1.61	1.63	0.48	1.75	0.37	2.37	0.42	1.60	0.21	1.66	0.27	13.54	0.57	0.87
123px-5-2	斑晶	m	0.05	0.21	0.09	0.22	0.58	0.13	0.65	0.09	0.79	0.15	0.55	0.07	0.37	0.03	3.98	0.48	0.66
123px-5-3	斑晶	r	0.13	0.94	0.30	1.95	1.32	0.45	2.42	0.42	2.97	0.60	1.37	0.19	1.43	0.23	14.71	0.53	0.75
123px-6-1	斑晶	c	0.13	0.77	0.12	1.24	0.48	0.28	1.80	0.25	1.87	0.46	1.09	0.18	1.10	0.17	9.95	0.44	0.82
123px-6-2	斑晶	m	0.08	0.35	0.13	0.69	0.49	0.19	0.90	0.18	1.21	0.23	0.58	0.07	0.71	0.09	5.89	0.48	0.84
123px-6-3	斑晶	m	0.14	0.76	0.29	1.65	1.11	0.42	1.81	0.35	2.46	0.44	1.75	0.29	1.44	0.24	13.15	0.50	0.90
123px-6-4	斑晶	r	0.11	0.91	0.22	1.78	0.86	0.36	1.63	0.33	2.00	0.36	1.45	0.25	1.37	0.18	11.78	0.56	0.92
123px-7-1	斑晶	c	0.19	1.01	0.25	2.41	1.39	0.47	1.54	0.26	2.54	0.52	1.45	0.19	1.80	0.22	14.24	0.67	0.98
123px-7-2	斑晶	r	0.18	0.79	0.23	1.83	1.14	0.36	2.25	0.30	2.11	0.47	1.45	0.18	1.24	0.21	12.74	0.55	0.67
123px-8-1	斑晶	c	0.30	1.57	0.37	3.60	1.88	0.69	2.92	0.54	4.01	0.80	2.38	0.30	2.33	0.35	22.05	0.62	0.89
123px-8-2	斑晶	m	0.09	0.35	0.11	0.62	0.38	0.10	1.23	0.10	0.86	0.18	0.44	0.03	0.51	0.11	5.11	0.48	0.41
123px-8-3	斑晶	r	0.10	0.94	0.29	2.36	1.27	0.42	2.29	0.44	2.75	0.45	1.42	0.17	1.47	0.18	14.56	0.59	0.75
123px-9-1	微晶	b	0.07	0.79	0.27	1.99	1.28	0.29	2.09	0.22	1.99	0.49	1.07	0.22	1.04	0.14	11.94	0.65	0.53
SRM 610	测量值		452.69	446.21	425.99	428.31	446.49	456.31	439.83	438.43	423.16	444.40	422.27	415.67	440.63	430.49
	理论值		457.00	448.00	430.00	431.00	451.00	461.00	444.00	443.00	427.00	449.00	426.00	420.00	445.00	435.00
BCR-2G	测量值		23.95	48.81	5.84	25.88	6.17	1.88	6.16	0.90	6.32	1.16	3.06	0.44	3.36	0.38
	理论值		24.70	53.30	6.70	28.90	6.59	1.97	6.71	1.02	6.44	1.27	3.70	0.51	3.39	0.50
注：“−”表示测点矿物形态较小，无法区分位置。

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表 3 九州‒帕劳脊岩浆温压条件及含水量的估算

Tab. 3 Estimation of temperature and pressure conditions and water content of the magma from Kyushu-Palau Ridge

站位号	样品	矿物类型	温度/°C		压力/10⁸pa		含水量/%		计算方法	数据来源
站位号	样品	矿物类型	范围	平均值	范围	平均值	范围	平均值	计算方法	数据来源
CJ09-123	玄武岩	cpx斑晶	1 151～1 210	1 187	1.3～4.2	2.5	0.8～2.3	1.6	文献[52, 63]	本研究
CJ09-123	玄武岩	cpx微晶	1 187～1 201	1 195	2.0～3.5	2.7	0.1～1.2	0.9	文献[52, 63]	本研究
ODP195-1201D	火山碎屑岩	cpx+opx	1 155±56	‒	2.9～6.3	‒	‒	‒	文献[64]	文献[57]
DSDP59-448	玄武岩	cpx	1 075～1 130	‒	‒	‒	‒	‒	文献[56]	文献[56]
注：含水量以湿质量计。

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