扬子地块北缘新元古代望江山层状岩体矿物成分和铂族元素特征:对岩浆演化过程和构造环境的制约

王岩; 王梦玺; 焦建刚

doi:10.12090/j.issn.1006-6616.2019.25.02.026

扬子地块北缘新元古代望江山层状岩体矿物成分和铂族元素特征:对岩浆演化过程和构造环境的制约

doi: 10.12090/j.issn.1006-6616.2019.25.02.026

王岩^1,,
王梦玺^{1, 2, ,},
焦建刚^{1, 2, 3}

1.
长安大学地球科学与资源学院, 陕西西安 710064
2.
国土资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710064
3.
教育部西部矿产资源与地质工程重点实验室, 陕西西安 710064

基金项目:

陕西省自然科学基础研究计划项目一般项目 2018JM4009

陕西省高校科协青年人才托举计划项目 20160213

中央高校基本科研业务费专项 300102277103

中央高校基本科研业务费专项 310827171003

详细信息

作者简介:
王岩(1992-), 男, 在读硕士, 专业方向:矿物学、岩石学、矿床学。E-mail:wy974920352@163.com

通讯作者:
王梦玺(1986-), 男, 副教授, 主要从事镁铁-超镁铁质岩体及相关矿床成因研究。E-mail: mxwang@chd.edu.cn

中图分类号: P587
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出版历程
- 收稿日期: 2018-11-30
- 修回日期: 2019-01-13
- 刊出日期: 2019-04-28

MINERAL COMPOSITION AND PLATINUM-GROUP ELEMENTS OF THE NEOPROTEROZOIC WANGJIANGSHAN LAYERED INTRUSION AT THE NORTHERN MARGIN OF THE YANGTZE BLOCK: IMPLICATIONS FOR THE PROCESSES OF MAGMA EVOLUTION AND TECTONIC SETTING

WANG Yan^1
,,
WANG Mengxi^{1, 2
, ,},
JIAO Jiangang^{1, 2, 3}

1.
School of Earth Science and Resources, Chang'an University, Xi'an 710064, Shannxi, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources, Xi'an 710064, Shannxi, China
3.
Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710064, Shannxi, China

摘要

摘要: 望江山层状岩体位于扬子地块北缘新元古代汉南杂岩带中，岩体从底部到顶部由超镁铁质岩过渡为中性岩：底部主要由辉石岩和橄长岩组成；中部为辉长苏长岩和辉长岩；上部为辉长岩和闪长岩。研究以中部岩相带橄榄辉长苏长岩、辉长苏长岩和辉长岩为对象，通过主要矿物的主微量元素和全岩主微量元素的分析，查明望江山岩体来源于尖晶石二辉橄榄岩组成的大陆下岩石圈地幔，并且地幔源区受到了来自俯冲板片流体的交代，岩体中部带的母岩浆为拉斑玄武质岩浆。钛铁矿—磁铁矿矿物对成分计算表明，母岩浆在形成时具有较高氧逸度。通过单斜辉石压力计得到岩体的侵位深度约为12.9~18 km。对岩体母岩浆橄榄石分离结晶过程的模拟计算表明，中部带橄榄石为母岩浆经过~28%分离结晶的产物。此外，铂族元素（PGE）组成暗示岩体并未经历过大规模的硫化物熔离，可能与缺乏地壳物质混染有关。岩体中单斜辉石与岛弧环境堆晶岩中单斜辉石成分相似，不同于裂谷环境中堆晶单斜辉石的成分；同时，全岩Th/Yb和Nb/Yb比值也与岛弧玄武岩比值相似，因此矿物和全岩成分均说明望江山层状岩体应形成于岛弧环境。研究认为扬子北缘在新元古代长期的俯冲过程中，大洋板片断离导致软流圈上涌，提供热源使交代大陆下岩石圈地幔部分熔融形成具有岛弧特征的镁铁质岩浆，在局部伸展环境中上升侵位形成汉南杂岩带中镁铁—超镁铁质层状岩体。
- 矿物成分 /
- 铂族元素 /
- 硫化物熔离 /
- 望江山层状岩体 /
- 扬子地块北缘
Abstract: The Wangjiangshan layered intrusion occurs in the Neoproterozoic Hannan arc at the northern margin of the Yangtze Block, and it is composed of ultramafic to intermediate rocks from the bottom to the top. The lower zone is mainly composed of pyroxenite and troctolite, the middle zone is olivine gabbro and gabbro, and the upper zone is gabbro and diorite. This study focuses on olivine noritegabbro, noritegabbro and gabbro in the middle zone. The compositions of olivine, pyroxene and bulk-rock suggest that the Wangjiangshan intrusion was derived from subcontinental lithospheric mantle which was mainly composed of spinel lherzolite and metasomatized by subducted slab-derived fluids. The parental magma of the middle zone was tholeiitic basalt with high oxygen fugacity, inferring from the in-situ compositions of ilmenite-magnetite mineral pair. The shallow magma chamber was about 12.9 to 18 km in depth in terms of clinopyroxene geobarometry. The modeling result shows that olivine from the middle zone was a product of~28% crystallization of the parental magma. In addition, the PGE pattern of the rocks from this study indicates a lack of large-scale sulfide segregation due to the absence of crustal contamination. The composition of clinopyroxene is akin to those from island arc, but different from clinopyroxene from the rifting. Moreover, rocks from the middle zone have bulk-rock Th/Yb and Nb/Yb ratios similar to ratios of island arc basalts. Therefore, the Wangjiangshan intrusion could be formed in island arc environment. We argue that the tearing and breakoff of subduction oceanic slab resulted in asthenosphere upwelling during the Neoproterozoic long-term subduction beneath the northern margin of Yangtze. This provided a heat source for the partial melting of the metasomatized subcontinental lithospheric mantle and subsequent formation of mafic magma with island arc characteristics, which ascended in an extensional environment to form mafic-ultramafic layered intrusions in the Hannan arc.
- mineral composition /
- platinum-group elements /
- sulfide segregation /
- Wangjiangshan layered intrusion /
- northern margin of the Yangtze Block
注释:

责任编辑：范二平

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图 1 扬子地块北缘望江山岩体地质简图(据参考文献[30]修改)

Figure 1. Geological map of the Wangjiangshan intrusion at the northern margin of the Yangtze Block (modified after [30])

下载: 全尺寸图片幻灯片

图 2 望江山岩体中不同岩石类型的岩相学特征

a—橄榄辉长苏长岩，单斜辉石(Cpx)、斜方辉石(Opx)和斜长石(Pl)自形程度接近形成辉长结构，正交偏光，样品WJS-21；
b—橄榄辉长苏长岩，橄榄石(Ol)被次生的角闪石(Amp)所包裹，正交偏光，样品WJS-20；
c—辉长岩，铁钛氧化物分布在硅酸盐矿物粒间，正交偏光，样品WJS-4；
d—辉长苏长岩，斜长石(Pl)、斜方辉石(Opx)和单斜辉石(Cpx)均呈半自形等轴粒状，辉长结构，正交偏光，样品WJS-34

Figure 2. Petrographic characteristics of different rock types from the Wangjiangshan intrusion

下载: 全尺寸图片幻灯片

图 3 望江山岩体MgO与SiO₂、TiO₂、CaO和FeO^(T)相关图解

Figure 3. Plots of MgO versus SiO₂, TiO₂, CaO and FeO^(T) of samples from the Wangjiangshan intrusion

下载: 全尺寸图片幻灯片

图 4 望江山岩体球粒陨石标准化稀土配分模式图及微量元素原始地幔标准化蛛网图(标准化数据据[31])

Figure 4. Chondrite-normalized REE patterns and primitive mantle-normalized trace element spider diagram of samples from the Wangjiangshan intrusion (Normalized values are from [31])

下载: 全尺寸图片幻灯片

图 5 望江山层状岩体铂族元素原始地幔标准化配分模式图^[1]

Figure 5. Primitive mantle-normalized PGE patterns of samples from the Wangjiangshan intrusion^[1]

下载: 全尺寸图片幻灯片

图 6 望江山层状岩体单斜辉石和斜方辉石的分类图解(底图据文献[32])

Figure 6. Diagram of classification for clinopyroxene and orthopyroxene from the Wangjiangshan layered intrusion. (The base map is from [32])

下载: 全尺寸图片幻灯片

图 7 望江山岩体中部带辉长岩及苏长辉长岩中单斜辉石稀土配分图解和微量元素蛛网图(标准化数据据[31])

Figure 7. Chondrite-normalized REE patterns and primitive mantle-normalized trace element spider diagram of clinopyroxene from gabbro and gabbronorite of the Wangjiangshan intrusion (Normalized values are from [31])

下载: 全尺寸图片幻灯片

图 8 望江山岩体全岩微量元素中Zr相对La、Nd、Sr、Ba与铂族元素中Ir相对Pt、Pd的相关图解

Figure 8. Plots of whole rock Zr concentration versus La, Nd, Sr, Ba and Ir versus Pt and Pd of samples from the Wangjiangshan intrusion

下载: 全尺寸图片幻灯片

图 9 望江山岩体地幔源区性质判别图

a—望江山层状岩体(La/Sm)_N—(Tb/Yb)_N图解；
b—单斜辉石^IVAl—^VIAl关系图^[41]；
c—全岩微量元素Nb/Zr—Th/Zr相对图解

Figure 9. Discrimination plots of the nature of mantle source of the Wangjiangshan intrusion

下载: 全尺寸图片幻灯片

图 10 望江山岩体单斜辉石SiO₂-Na₂O-TiO₂ 相关图解^[42]

Figure 10. Plot of SiO₂-TiO₂-Al₂O₃ of clinopyroxene from the Wangjiangshan intrusion^[41]

下载: 全尺寸图片幻灯片

图 11 望江山岩体氧逸度—温度相对图解^[43]

HM-赤铁矿-磁铁矿缓冲剂;FMQ-铁橄榄石-磁铁矿-石英缓冲剂;WM-方铁矿-磁铁矿缓冲剂

Figure 11. Oxygen fugacity vs. temperature diagram of the Wangjiangshan intrusion ^[43] (HM is hematite-magnetite buffer; FMQ is fayalite-magnetite-quartz buffer; WM is wustite-magnetite buffer)

下载: 全尺寸图片幻灯片

图 12 望江山岩体橄榄石Fo-Ni相关图解

Figure 12. Plot of Fo versus Ni for olivine crystals from the Wangjiangshan intrusion

下载: 全尺寸图片幻灯片

图 13 望江山岩体构造环境判别图解

a—单斜辉石TiO₂与Al^IV图解(Southeastern Alaska数据引自[59]，Duke Island数据引自[61], 弧堆晶和裂谷堆晶岩趋势及碱性—非碱性界线据[62]和[56])；b—全岩Th/Yb—Nb/Yb比值图解(OIB—洋岛玄武岩，MORB—岛弧玄武岩^[63])

Figure 13. Tectonic discrimination plots of the Wangjiangshan intrusion

下载: 全尺寸图片幻灯片

表 1 望江山层状岩体各类岩石主量元素组成(%)

Table 1. Major element concentrations of rocks from the Wangjiangshan intrusion (%)

样号	岩性	SiO₂	TiO₂	Al₂O₃	FeO^(T)	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	TOTAL
WJS-1	辉长岩	42.44	4.07	14.64	18.92	0.17	5.76	11.11	2.12	0.24	0.13	0.15	99.75
WJS-2		42.11	4.25	14.49	18.78	0.17	5.65	10.87	2.15	0.24	0.14	0.29	99.14
WJS-4		41.54	3.95	14.33	19.53	0.17	5.8	11.1	2.09	0.2	0.13	0.28	99.12
WJS-6		43.43	3.26	15.54	18.12	0.15	5.57	10.69	2.35	0.27	0.16	0.08	99.62
WJS-12		51.15	1.14	15.93	9.98	0.16	6.07	9.06	3.08	1.08	0.14	0.49	98.28
WJS-23		44.56	3.39	17.47	12.94	0.16	4.73	10.65	2.91	0.25	1.67	0.07	98.8
WJS-30		50.17	0.9	18.74	7.83	0.14	6.19	11.4	2.86	0.17	0.5	0.23	99.13
WJS-25		42.53	3.73	15.47	18.22	0.16	5.53	10.89	2.23	0.23	0.13	0.33	99.45
WJS-5	辉长苏长岩	42.16	4.18	14.77	19.07	0.17	5.58	10.82	2.17	0.23	0.13	0.14	99.42
WJS-7		41.98	4.26	14.4	19.22	0.17	5.71	10.91	2.13	0.24	0.11	0	99.13
WJS-8		42.12	3.93	14.62	18.91	0.17	5.85	11.13	2.22	0.21	0.13	0.17	99.46
WJS-9		41.46	4.32	14.23	19.92	0.17	5.79	11.08	2.13	0.2	0.13	0.19	99.62
WJS-13		51.28	1.15	16.01	10.03	0.16	6.06	8.95	3.12	1.1	0.16	0.53	98.55
WJS-14		50.44	1.11	16.5	8.6	0.14	5.99	9.89	3.08	0.94	0.17	1.77	98.63
WJS-15		50.7	1.19	15.5	9.01	0.15	6.49	10.19	2.9	1.03	0.18	1.25	98.59
WJS-22		46.92	1.76	16.3	12.59	0.18	7.34	9.27	3.02	0.47	0.24	0.37	98.46
WJS-24		43.11	3.26	16.49	16.47	0.15	5.12	10.58	2.58	0.25	0.17	0	98.18
WJS-3		43.12	3.49	15.87	17.71	0.16	5.63	10.46	2.38	0.23	0.18	0	99.23
WJS-26		43.28	3.44	16.46	17.05	0.16	5.26	10.54	2.52	0.22	0.17	0.27	99.37
WJS-27		42.85	3.72	15.64	16.7	0.16	5.61	10.71	2.44	0.21	0.21	0.04	98.29
WJS-28		50.65	0.98	17.94	8.37	0.16	6.99	11	2.76	0.15	0.18	0.25	99.43
WJS-29		50.1	0.86	17.77	8.49	0.16	7.09	10.82	2.75	0.15	0.12	0.4	98.71
WJS-31		49.5	0.8	17.6	8.34	0.16	7.33	11.21	2.6	0.12	0.21	0.31	98.18
WJS-32		49.44	0.91	18.04	7.79	0.16	6.72	11.73	2.7	0.15	0.34	0.49	98.47
WJS-34		49.99	0.78	18.99	7.12	0.15	6.01	11.89	2.83	0.16	0.33	0.37	98.62
WJS-35		49.97	0.84	18.88	7.29	0.15	6.18	11.81	2.73	0.15	0.33	0.75	99.08
WJS-36		48.56	2.02	17.77	10.35	0.17	5.76	10.17	2.91	0.28	0.35	0.41	98.75
WJS-20	橄榄辉长苏长岩	47.46	1.65	15.86	12.91	0.19	8.81	8.57	2.85	0.53	0.21	0.34	99.38
WJS-21	橄榄辉长苏长岩	46.6	1.66	16.47	12.24	0.18	7.6	9.12	2.94	0.47	0.23	0.62	98.13

下载: 导出CSV

表 2 望江山层状岩体各类岩石微量元素与稀土元素组成(×10^-6)

Table 2. Trace element and REE concentrations of rocks from the Wangjiangshan intrusion (×10^-6)

样号	岩性	V	Cr	Co	Ni	Cu	Zn	Ga	Rb	Sr	Y	Zr	Nb	Mo	Ba	La	Ce	Pr
WJS-1	辉长岩	868	0.6	62.56	112	133	109	20.59	3.5	360	17.93	53.17	2.58	0.09	110	4.55	10.97	1.62
WJS-2		901	0.74	63.97	158	123	114	21.33	4.22	362	17.35	59.78	2.92	0.12	112	4.55	10.72	1.63
WJS-4		941	0.77	67.78	1.73	146	114	21.47	2.59	345	15.5	47.79	2.14	0.09	101	3.59	8.96	1.3
WJS-6		896	0.84	80.48	14.11	50.88	93.87	21.31	4.71	433	16.46	56.5	2.15	0.1	123.8	4.58	11.53	1.71
WJS-12		212	67.93	38.95	24.93	19.4	76.27	17.75	24.02	287	28.03	153.45	4.82	0.48	373	13.17	30.6	3.74
WJS-23		272	1.45	31.87	1.6	23.5	84.19	19.26	2.55	679	31.86	58.9	4.61	0.1	142.1	11.46	30.41	4.47
WJS-30		105	247.82	21.62	54.76	6.91	56.82	17.24	1.57	693	15.7	32.23	1.65	0.12	103	4.97	13.23	1.93
WJS-25		901	0.99	70.63	1.28	131	108	20.89	3.23	380	14.92	50.86	2.11	0.13	114.05	3.9	9.33	1.48
WJS-5	辉长苏长岩	936	0.61	63.28	112	137	117	23.15	4.03	375	17.81	59.63	2.96	0.16	114	4.14	10.94	1.57
WJS-7		923	0.65	64.14	38.08	131	117	21.35	3.78	358	16.9	61.17	2.93	0.1	112.25	4.24	10.51	1.57
WJS-8		1096	3.56	89.64	1.69	58.2	117	20.29	2.35	377	16.09	48.04	2.23	0.21	103	3.88	9.77	1.45
WJS-9		974	0.24	67.76	110	147	120	21.07	2.65	355	16.39	49.66	2.4	0.16	104	4.1	10.14	1.51
WJS-13		217	62.69	37.5	26.21	16.67	74.72	18.02	23.11	279	26.81	159.41	4.82	0.45	371	12.86	28.23	3.49
WJS-14		173	162.2	32.67	31.5	38.79	65.88	17.3	18.03	284	25.54	130	4.47	0.42	322	10.57	24	3.26
WJS-15		181	273.31	36.86	60.82	98.24	70.92	17.01	21.07	258	28.65	143.75	5.04	0.44	342	11.12	26.25	3.63
WJS-22		240	176	48.02	105	61.44	97.79	18.68	6.36	279	31.4	149	4.18	0.37	281	8.48	21.72	3.29
WJS-24		524	1.04	64.71	5.83	43.35	93.81	20.44	3.92	474	15.14	49.99	2.13	0.16	130	4.64	11.45	1.58
WJS-3		605	1.71	68.27	1.33	43.9	106	22.94	3.92	458	15.9	58.35	2.54	0.1	131	4.97	12.05	1.72
WJS-26		534	0.77	63.74	6.79	42.94	95	21.96	2.88	481	15.29	50.86	2.51	0.09	128	4.19	10.7	1.59
WJS-27		540	0.8	64.42	6.56	43.63	102	21.53	3.02	439	16.66	55.12	2.73	0.13	125	4.49	11.15	1.61
WJS-28		98.62	215	22.55	42.2	6.99	57.59	16.16	1.12	637	13.57	31.86	1.54	0.03	106	3.47	8.88	1.3
WJS-29		106	241	24.15	48.12	7.35	60.55	16.37	1.15	637	13.32	28.83	1.14	0.06	106	3.45	8.72	1.22
WJS-31		109	291	24.77	60.21	6.54	63.77	16.37	0.78	674	10.59	20.17	0.69	0.01	83	2.75	6.48	1.1
WJS-32		97.64	282	21.45	58.78	6.61	58.07	15.58	1.08	650	10.65	22.12	0.89	0.07	80	3.05	7.52	1.07
WJS-34		21.4	23.63	2.19	5.91	2.2	22.02	5.31	94.71	41	20	245.75	6.45	0	325	63.01	127.42	14.24
WJS-35		96.14	275	20.48	58.21	5.81	54.42	17.5	1.32	688	10.44	20.72	0.8	0.01	84	3.06	7.5	1.19
WJS-36		167	61.45	25.79	22.66	13.09	68.75	20.35	4.15	646	21.92	69.35	3.69	0.25	161	6.99	17.52	2.39
WJS-20	橄榄辉长苏长岩	212	176	56.29	195	95.34	93.82	17.74	7.47	258	28.61	155	4.26	0.3	293	7.5	19.63	2.79
WJS-21	橄榄辉长苏长岩	219	165	49.45	128	60.85	89.18	18.16	6.83	278	28.71	141	4.09	0.22	285	7.63	20.57	2.99
样号	岩性	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Hf	Ta	Pb	Th	U	Cs
WJS-1	辉长岩	8.3	2.58	1.56	3.11	0.52	3.16	0.66	1.91	0.25	1.63	0.2	1.6	0.37	1.66	0.38	0.08	0.12
WJS-2		8.71	2.7	1.31	2.96	0.56	3.15	0.61	1.88	0.24	1.52	0.21	2.11	0.34	1.73	0.44	0.11	0.15
WJS-4		7.42	2.21	1.17	2.68	0.48	2.8	0.47	1.36	0.21	1.16	0.21	1.32	0.22	1.55	0.22	0.07	0.11
WJS-6		9.08	2.54	1.39	2.85	0.48	3.34	0.62	1.98	0.26	1.49	0.23	1.79	0.2	1.75	0.36	0.12	0.14
WJS-12		17.09	4.45	1.38	5.04	0.77	5.38	1.19	3.36	0.47	2.69	0.48	4.49	0.39	6.63	1.86	0.54	0.76
WJS-23		22.18	6.15	2.45	6.98	0.99	6.08	1.2	3.12	0.43	2.15	0.34	1.92	0.35	2.13	0.42	0.13	0.07
WJS-30		9.81	2.8	1.31	3.12	0.5	2.92	0.56	1.66	0.2	1.29	0.24	0.99	0.13	1.58	0.19	0.05	0.07
WJS-25		7.42	2.29	1.26	2.37	0.44	2.99	0.53	1.54	0.22	1.35	0.2	1.52	0.25	1.84	0.29	0.09	0.11
WJS-5	辉长苏长岩	7.78	2.74	1.26	3.01	0.53	3.03	0.64	1.85	0.29	1.25	0.19	1.74	0.24	1.81	0.37	0.1	0.15
WJS-7		8.25	2.3	1.43	3.39	0.49	3.06	0.68	1.96	0.28	1.91	0.22	1.86	0.3	1.79	0.33	0.09	0.12
WJS-8		7.95	2.6	1.47	3	0.54	3.23	0.76	1.61	0.26	1.64	0.19	1.55	0.26	1.61	0.27	0.06	0.1
WJS-9		7.9	2.42	1.35	3.16	0.51	3.32	0.65	1.79	0.25	1.52	0.27	1.59	0.26	1.69	0.26	0.07	0.14
WJS-13		15.23	3.67	1.28	4.36	0.81	4.53	1.08	2.86	0.45	2.76	0.41	4.4	0.34	6.55	1.93	0.55	0.74
WJS-14		14.88	3.69	1.39	4.59	0.7	4.28	0.95	2.62	0.41	2.35	0.36	3.75	0.29	5.81	1.38	0.43	0.78
WJS-15		16.72	3.69	1.56	4.76	0.76	5.45	1.02	3.19	0.43	2.8	0.48	3.77	0.36	6.19	1.4	0.45	0.79
WJS-22		16.61	4.16	1.68	5.45	0.82	5.76	1.22	3.32	0.5	3.05	0.41	3.95	0.32	3.22	0.6	0.19	0.23
WJS-24		7.94	2.53	1.53	2.86	0.44	2.88	0.6	1.81	0.21	1.13	0.19	1.64	0.21	1.86	0.3	0.09	0.13
WJS-3		9.09	2.6	1.46	3.09	0.52	3.15	0.58	1.75	0.22	1.62	0.22	1.56	0.19	1.89	0.32	0.1	0.11
WJS-26		7.71	2	1.44	2.8	0.51	2.73	0.55	1.58	0.21	1.2	0.19	1.59	0.25	1.79	0.25	0.07	0.14
WJS-27		8.17	2.58	1.36	3.06	0.51	3.27	0.59	1.61	0.22	1.48	0.2	1.44	0.23	1.72	0.24	0.07	0.17
WJS-28		6.71	1.88	1.15	2.71	0.38	2.23	0.48	1.54	0.16	1.19	0.17	0.88	0.12	1.5	0.11	0.03	0.06
WJS-29		6.27	1.84	1.07	2.28	0.42	2.24	0.5	1.44	0.19	1.09	0.21	0.75	0.09	1.73	0.11	0.03	0.05
WJS-31		5.54	1.63	0.94	1.88	0.33	2.28	0.49	1.35	0.14	0.87	0.15	0.71	0.09	1.19	0.08	0.03	0.03
WJS-32		6.11	1.66	1.11	2.02	0.37	2.09	0.37	1.18	0.15	1.04	0.16	0.77	0.09	1.1	0.12	0.04	0.08
WJS-34		54.01	9.31	1.4	7.71	0.96	4.49	0.67	1.99	0.26	1.71	0.25	7.84	0.56	38.56	11.78	3.38	1.47
WJS-35		6.07	1.66	0.99	2.08	0.35	2.12	0.36	1.14	0.16	0.77	0.14	0.8	0.07	1.08	0.11	0.03	0.09
WJS-36		12.26	3.57	1.67	4.3	0.66	3.76	0.79	2.39	0.31	2.09	0.27	1.87	0.34	2.49	0.4	0.11	0.16
WJS-20	橄榄辉长苏长岩	13.79	3.53	1.57	4.62	0.81	5.09	1	2.84	0.46	2.59	0.42	3.99	0.26	3.54	0.62	0.2	0.29
WJS-21	橄榄辉长苏长岩	15.57	4.11	1.54	4.74	0.77	5.13	1.05	3.02	0.45	2.59	0.4	3.53	0.22	3.15	0.5	0.18	0.24

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表 3 望江山岩体不同岩相铂族元素组成(×10^-9)

Table 3. Platinum group element concentrations of samples from the Wangjiangshan intrusion (×10^-9)

样号	岩性	Ir	Ru	Rh	Pt	Pd	ΣPGE
WJS-4	辉长岩	0.003	0.184	0.124	5.083	5.775	11.169
WJS-6	辉长岩	0.002	0.176	0.028	0.028	0.082	0.316
WJS-25	辉长岩	0.025	0.212	0.391	4.041	10.612	15.281
WJS-14	辉长苏长岩	0.052	0.215	0.123	6.586	6.845	13.821
WJS-24	辉长苏长岩	0.007	0.165	0.099	0.358	2.097	2.726
WJS-28	辉长苏长岩	0.008	0.141	0.087	0.183	0.274	0.693
WJS-29	辉长苏长岩	0.010	0.134	0.136	1.096	4.207	5.583
WJS-26	辉长苏长岩	0.002	0.183	0.027	0.066	0.104	0.382
WJS-31	辉长苏长岩	0.008	0.180	0.125	0.346	1.389	2.048
WJS-20	橄榄辉长苏长岩	0.111	0.260	0.375	2.389	8.271	11.406
WJS-21	橄榄辉长苏长岩	0.037	0.277	0.200	0.624	0.713	1.851

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表 4 望江山岩体橄榄辉长苏长岩中橄榄石成分(%)

Table 4. Major element concentrations of olivine from the Wangjiangshan intrusion (%)

样号	WJS21-1	WJS21-3	WJS21-2	WJS21-4	WJS20-2	WJS20-3
Na₂O	0.00	0.01	0.04	0.00	0.06	0.03
K₂O	0.00	0.01	0.01	0.00	0.00	0.00
FeO	40.07	38.91	38.69	36.64	41.17	38.89
MgO	24.54	25.21	24.70	26.69	24.74	26.15
P₂O₅	0.00	0.00	0.00	0.00	0.04	0.01
MnO	0.71	0.61	0.74	0.69	0.57	0.54
Al₂O₃	0.00	0.04	0.00	0.00	0.00	0.01
CaO	0.00	0.00	0.00	0.00	0.00	0.00
Cr₂O₃	0.02	0.02	0.00	0.02	0.04	0.00
SiO₂	35.17	35.27	34.93	35.78	34.03	34.39
TiO₂	0.00	0.06	0.00	0.06	0.00	0.01
NiO	0.04	0.06	0.08	0.12	0.02	0.06
Total	100.55	100.18	99.20	99.98	100.66	100.07
Fo值	52.20	53.60	53.20	56.50	51.70	54.50

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表 5 望江山岩体单斜辉石主量元素分析结果(%)

Table 5. Major elements of clinopyroxene from the Wangjiangshan intrusion (%)

点号	岩性	Na₂O	K₂O	FeO	MgO	P₂O₅	MnO	Al₂O₃	CaO	Cr₂O₃	SiO₂	TiO₂	NiO	Total	Wo	En	Fs
WJS6-1	辉长岩	0.31	0.00	8.84	14.04	0.00	0.34	1.95	21.91	0.01	52.12	0.47	0.00	99.98	46.10	41.00	12.90
WJS6-2		0.31	0.00	10.54	14.78	0.00	0.29	2.34	19.42	0.36	51.24	0.64	0.00	99.93	41.40	43.80	14.80
WJS6-3		0.35	0.00	10.45	14.20	0.00	0.28	2.56	19.93	0.01	50.95	0.87	0.00	99.60	42.70	42.30	15.00
WJS6-4		0.42	0.00	8.61	14.49	0.00	0.26	1.16	21.91	0.04	52.64	0.05	0.06	99.64	46.30	42.60	11.20
WJS25-1		0.42	0.01	9.53	14.58	0.01	0.26	2.18	21.33	0.05	50.45	0.60	0.05	99.46	46.70	44.40	9.00
WJS24-1	辉长苏长岩	0.24	0.01	8.55	14.54	0.00	0.24	2.17	21.30	0.03	51.22	0.56	0.00	98.86	45.20	42.90	11.90
WJS24-2		0.21	0.00	8.83	14.79	0.00	0.33	1.00	21.82	0.00	52.39	0.30	0.01	99.67	45.40	42.80	11.80
WJS24-3		0.26	0.00	7.84	15.62	0.00	0.20	2.07	20.57	0.02	52.10	0.47	0.00	99.15	43.00	45.40	11.60
WJS24-4		0.29	0.01	10.30	14.65	0.00	0.23	2.08	20.13	0.01	51.56	0.53	0.00	99.79	42.60	43.10	14.30
WJS26-1		0.23	0.00	8.86	14.32	0.00	0.34	2.16	20.46	0.01	52.36	0.74	0.07	99.53	43.30	42.10	14.60
WJS26-2		0.24	0.01	8.64	14.43	0.00	0.23	2.33	21.95	0.05	51.24	0.54	0.09	99.74	46.60	42.60	10.70
WJS26-3		0.33	0.01	8.48	14.08	0.00	0.26	2.29	21.46	0.03	51.18	0.64	0.01	98.77	45.90	41.90	12.20
WJS26-4		0.30	0.01	8.56	14.62	0.00	0.29	2.20	20.33	0.01	51.74	0.57	0.00	98.62	42.90	43.00	14.10
WJS31-1		0.44	0.00	8.00	14.63	0.00	0.31	2.38	22.22	0.04	52.19	0.72	0.03	100.96	46.90	43.00	10.10
WJS31-2		0.26	0.01	8.86	14.93	0.00	0.28	2.02	19.47	0.06	52.52	0.35	0.06	98.82	41.30	44.00	14.70
WJS31-3		0.38	0.00	7.65	14.57	0.00	0.40	2.00	22.13	0.07	51.70	0.39	0.01	99.31	47.30	43.30	9.50
WJS31-4		0.28	0.00	8.14	14.86	0.00	0.31	2.11	21.24	0.04	51.44	0.63	0.06	99.10	45.00	43.80	11.20
WJS34-1		0.36	0.01	7.47	14.51	0.00	0.18	1.70	22.13	0.06	52.28	0.31	0.00	99.00	46.50	42.40	11.00
WJS34-2		0.40	0.00	8.57	14.63	0.00	0.34	2.11	21.77	0.09	51.89	0.65	0.00	100.45	46.10	43.10	10.70
WJS34-3		0.32	0.00	8.23	14.54	0.00	0.32	2.00	22.06	0.12	51.70	0.42	0.00	99.71	46.80	42.90	10.30
WJS34-4		0.17	0.00	6.89	14.89	0.00	0.34	0.53	23.63	0.11	52.66	0.15	0.00	99.37	48.90	42.80	8.30

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表 6 望江山岩体斜方辉石主量元素含量(%)

Table 6. Major element concentrations of orthopyroxene from the Wangjiangshan intrusion (%)

点号	岩性	Na₂O	K₂O	FeO^(T)	MgO	P₂O₅	MnO	Al₂O₃	CaO	Cr₂O₃	SiO₂	TiO₂	NiO	Total	Wo	En	Fs
WJS6-1	辉长岩	0.04	0.01	22.33	22.40	0	0.63	0.64	1.15	0.05	53.14	0.17	0	100.55	2.3	63.5	34.1
WJS6-2	辉长岩	0	0	23.84	21.77	0	0.56	0.71	0.9	0	52.64	0.29	0.04	100.74	1.9	62	36.2
WJS21-1	橄榄辉长苏长岩	0.03	0	22	22.17	0	0.52	0.63	1.24	0.03	53.03	0.24	0.02	99.91	2.5	62.8	34.7
WJS21-2		0	0.02	21.19	22.53	0	0.64	0.77	0.82	0.01	53.43	0.2	0	99.6	1.7	64.4	34
WJS21-3		0	0.01	22.36	22.33	0	0.47	0.65	0.66	0.04	53.4	0.01	0	99.92	1.3	63.2	35.5
WJS24-1	辉长苏长岩	0.01	0.01	18.97	25.23	0	0.55	0.85	0.48	0.01	54.34	0.29	0	100.73	1	69.7	29.4
WJS24-2		0	0.01	20.4	23.68	0	0.48	0.77	0.47	0.03	53.51	0.06	0	99.42	1	66.8	32.3
WJS24-3		0.01	0	19.07	24.38	0	0.59	1	0.73	0	53.73	0.2	0.01	99.72	1.5	68.5	30.1
WJS26-1		0.01	0.02	19.09	24.05	0	0.5	0.88	0.95	0.05	53.92	0.34	0.12	99.93	1.9	67.9	30.2
WJS26-2		0.07	0	19.9	23.5	0	0.6	1.12	0.77	0.01	53.45	0.23	0	99.65	1.6	66.7	31.7
WJS31-1		0.02	0	17.21	24.58	0	0.49	1.29	2.66	0.03	53.75	0.17	0	100.2	5.3	68.6	26
WJS31-2		0.04	0	18.6	25.08	0	0.65	0.76	0.6	0	54.09	0.16	0	99.97	1.2	69.8	29
WJS31-3		0	0	18.24	25.04	0	0.53	0.9	1.42	0.02	54.02	0.22	0	100.39	2.8	69.5	27.7
WJS31-4		0.15	0.04	17.28	21.56	0	0.48	1.42	3.01	0.89	53.4	0.3	0	98.53	6.5	64.5	29
WJS31-5		0.01	0	18.27	25.1	0	0.77	0.88	0.69	0.06	53.95	0.14	0	99.87	1.4	70.1	28.5
WJS34-1		0.03	0	17.74	24.34	0	0.66	0.71	3.33	0.04	53.51	0.09	0	100.45	6.7	68.6	24.6
WJS34-2		0	0.01	18.7	24.94	0	0.61	0.87	0.66	0.04	53.67	0.21	0	99.71	1.3	69.8	28.9

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表 7 望江山岩体辉长岩和辉长苏长岩中磁铁矿—钛铁矿成分(%)

Table 7. Magnetite-ilmenite concentrations of rocks from gabbro and gabbronorite of the Wangjiangshan intrusion (%)

	WJS-25-1		WJS-25-3		WJS-26-4		WJS-26-1		WJS-26-2	WJS-26-3	WJS-30	WJS-34
	辉长岩				辉长苏长岩
	钛铁矿	磁铁矿	钛铁矿	磁铁矿	钛铁矿	磁铁矿	磁铁矿	钛铁矿	钛铁矿	磁铁矿	磁铁矿	磁铁矿
SiO₂	0.09	0.05	0.038	0.03	0	0.07	0.06	0	0	0.07	0.04	0.06
TiO₂	51.36	0.2	52.83	0.4	52.1	0.34	0.18	53.01	46.96	0.34	0.12	0.13
Al₂O₃	0.05	0.37	0	0.46	0	0.03	0.48	0	0.04	0.03	0.4	0.26
P₂O₅	0.05	0.09	0.02	0	0.05	0	0	0	0	0	0	0
FeO^(T)	46.06	91.06	44.1	90.3	47.69	90.72	91.75	45.62	52.92	90.72	91.52	93.65
MnO	1	0.03	0.97	0	0.94	0	0.05	1.42	0.64	0	0.01	0.03
MgO	1.24	0.07	1.85	0.07	0.26	0	0.13	1.19	0.9	0	0.21	0.17
CaO	0	0.02	0	0	0	0	0	0	0	0	0	0
Na₂O	0.11	0.1	0.02	0.18	0	0.05	0.03	0	0	0.05	0.03	0
K₂O	0.01	0.01	0	0.01	0.01	0	0	0	0	0	0	0
Cr₂O₃	0.14	0.01	0.03	0.08	0.04	0.09	0.09	0.08	0	0.09	1.3	1.81
NiO	0.02	0	0	0.03	0	0.05	0.1	0	0	0.05	0	0.06
Total	100.12	92.02	99.87	91.58	101.09	91.35	92.87	101.39	101.53	91.35	93.62	96.17

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