湘中紫云山岩体暗色微粒包体的成因：岩相学、全岩及矿物地球化学证据

曾认宇; 赖健清; 张利军; 鞠培姣

doi:10.3799/dqkx.2016.512

湘中紫云山岩体暗色微粒包体的成因：岩相学、全岩及矿物地球化学证据

doi: 10.3799/dqkx.2016.512

曾认宇^1,2,,
赖健清^1,2, ,,
张利军^1,2,3,
鞠培姣^1,2

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.
湖南省有色地质勘查研究院，湖南长沙 410015

基金项目:

中南大学创新驱动计划项目 2015CX008

国家自然科学基金 41172297

国家自然科学基金 41472301

详细信息

作者简介:
曾认宇(1989-)，男，博士研究生，主要从事火成岩研究.E-mail：zengrenyu@126.com

通讯作者:
赖健清, E-mail: ljq@csu.edu.cn

中图分类号: P588.121;P588.122
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出版历程
- 收稿日期: 2016-01-22
- 刊出日期: 2016-09-15

Petrogenesis of Mafic Microgranular Enclaves: Evidence from Petrography, Whole-Rock and Mineral Chemistry of Ziyunshan Pluton, Central Hunan

Zeng Renyu^{1,2
,},
Lai Jianqing^{1,2
, ,},
Zhang Lijun^1,2,3,
Ju Peijiao^1,2

1.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
3.
Institute of Hunan Nonferrous Geological Exploration, Changsha 410015, China

摘要

摘要: 暗色微粒包体广泛分布于湘中紫云山岩体中的似斑状角闪石黑云母花岗闪长岩中，但其研究程度较低.对具有火成结构的暗色微粒包体及其寄主岩进行了岩相学、全岩及长石、辉石、黑云母的矿物地球化学研究，探讨其岩石成因及构造意义.寄主岩的全岩主量、微粒元素较为均一，而暗色微粒包体变化较大，且后者相对贫SiO₂而富Na₂O，但总体上二者均具有准铝质、钙碱性、镁质的特征，均富集轻稀土和大离子亲石元素，而亏损重稀土和高场强元素.寄主岩和暗色微粒包体的斜长石、辉石和黑云母均分别属于中长石、次透辉石－低铁次透辉石和铁质黑云母的范畴，显示相似的矿物地球化学特征.详尽的岩相学和地球化学特征表明，寄主岩属于I型和ACG型花岗岩，具有明显壳幔混合的特点；而暗色微粒包体形成时处于液态并具有流动性，与寄主岩间存在明显的机械和化学混合作用，并具有早期为骤冷快速结晶、晚期缓慢结晶这两期过程.因此，紫云山岩体中出现大量暗色微粒包体，是印支晚期湘中地区在强烈挤压之后的松弛阶段，由于软流圈物质上涌，并与其诱发的壳源酸性岩浆混合作用的产物.
- 紫云山岩体 /
- 暗色微粒包体 /
- 矿物 /
- 地球化学 /
- 岩浆混合 /
- 辉石 /
- 火成岩
Abstract: The porphyraceous hornblende biotite granodiorite is generated in the Ziyunshan pluton, Central Hunan Province, which hosts many mafic microgranular enclaves (MMEs). This paper presents petrography, major and trace elements of whole-rock, and mineral chemistry of feldspar, pyroxene, as well as biotite of the igneous-texture mafic microgranular enclaves and host rocks, their genetic mechanism and geotectonic significance were investigated. The whole-rock geochemistry of host rocks is more stable than those of mafic microgranular enclaves, and the latter were characterized by relatively depleted SiO₂ and enriched Na₂O. Both of them are represented by metaluminous, calc-alkaline and magnesian, and enrichment of LREE and LILE and depletion of HREE and HFSE. The plagioclase, pyroxene and biotite of host rocks and mafic microgranular enclaves belong to andesine, ferrosalite-salite and ferribiotite, respectively, showing similar characteristics of mineral chemistry. According to a comprehensive analysis of petrographical characteristics and geochemical data, it is suggested that (1) the host rock belongs to I-type and ACG-type granite, showing the characteristics of crust-mantle mixing; (2) the mafic microgranular enclaves were formed in liquid state, having liquidity and featuring both mechanical and chemical interactions with host rocks; (3) the crystallization of the mafic microgranular enclaves can be classified into two stages: the initial one is undercooling and rapid crystallization stage, and the latter is slow crystallization stage. To sum up, the mafic microgranular enclaves in the Ziyunshan pluton were generated by mixing of mafic magmas (sub-alkaline tholeiite which formed from mantle) and its induced crustal felsic magma (products of partial melting of arenaceous rock in crust) in the relaxation period after the compressive stress period in the late Indo-Chinese epoch.
- Ziyunshan pluton /
- mafic microgranular enclave /
- mineral /
- geochemistry /
- magma mixing /
- pyroxene /
- igneous rock

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图 1 湖南紫云山岩体区域综合地质简图

1.中新生界；2.上古生界；3.下古生界；4.元古界；5.花岗岩体；6.断层；7.黑(二)云母二长花岗岩；8.似斑状含角闪石黑云母二长花岗岩；9.似斑状角闪石黑云母花岗闪长岩；10.透辉石(角闪石)富黑云母二长花岗岩；11.采样位置；12.断层.图a修改自刘凯等(2014)

Fig. 1. Simplified geological maps of the Ziyunshan pluton in Hunan

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图 2 寄主岩与暗色微粒包体野外照片

a.成群出现且大小不一的暗色微粒包体；b.岩墙状的暗色微粒包体；c.镰刀状的暗色微粒包体；d.具有明显的拖尾且内部成分不均一的暗色微粒包体；e.暗色微粒包体中的反向脉；f.具有淬火结构的冷凝边的暗色微粒包体；g.暗色微粒包体中浅色物质呈弥散状分布；h.双包体；i.暗色微粒包体中的暗色矿物团块

Fig. 2. Field photographs displaying of host rocks and mafic microgranular enclaves

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图 3 寄主岩与暗色微粒包体镜下照片

a，b.寄主岩中具聚片双晶的斜长石和有明显熔蚀现象的黑云母；c，d.暗色微粒包体中粒度较大的石英包嵌多种粒度较小辉石、黑云母等暗色矿物和针状-短柱状的磷灰石；e.石英斑晶被辉石等暗色矿物环绕，构成齿冠结构；f.暗色微粒包体中由辉石为主的暗色矿物组成的暗色矿物团块.图a、e、f左边为单偏光，右边为正交偏光，图b为单偏光，图c、d为正交偏光.矿物缩写：Qtz.石英；Pl.斜长石；Bt.黑云母；Kfs.钾长石；Cpx.单斜辉石；Ap.磷灰石；Di.透辉石

Fig. 3. Thin sections photographs of host rocks and mafic microgranular enclaves

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图 4 寄主岩与暗色微粒包的A/KNC-A/NC图解(a)，SiO₂-MALI图解(b)，SiO₂-Fe^*图解(c)和花岗岩类TAS分类图解(d)

图a底图据Maniar and Piccoli(1989)；图b和图c底图据Frost et al.(2001)；图d底图据Middlemost(1994)

Fig. 4. The A/KNC-A/NC diagram (a), SiO₂-MALI diagram(b), SiO₂-Fe^* diagram (c) and TAS diagram (d) of host rocks and mafic microgranular enclaves

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图 5 暗色微粒包体与寄主岩的Harker图解

Fig. 5. Harker diagram of host rocks and mafic microgranular enclaves

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图 6 寄主岩与暗色微粒包体的稀土元素球粒陨石标准化配分模式(a, b)及微量元素原始地幔标准化图解(c, d)

球粒陨石和原始地幔标准化值据Sun and McDonough(1989)

Fig. 6. Chondrite-normalized REE patterns (a, b) and primitive mantle-normalized trace element spidergrams (c, d) of their host rocks and mafic microgranular enclaves

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图 7 寄主岩(a)和暗色微粒包体(b)的长石命名图解

Fig. 7. Nomenclature of the feldspars from host rocks (a) and mafic microgranular enclaves (b)

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图 8 寄主岩中斜长石环带剖面

Fig. 8. The crossed polars image of the oscillatory zoning in plagioclase from host rocks

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图 9 寄主岩(a)和暗色微粒包体(b)的单斜辉石成分分类

底图据Tröger et al.(1969)

Fig. 9. Classification of clinopyroxene from host rocks (a) and mafic microgranular enclaves (b)

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图 10 单斜辉石Mg^#与SiO₂、CaO、Al₂O₃和MnO相关关系

Fig. 10. Major elements vs. Mg^# of clinopyroxene phenocrysts

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图 11 单斜辉石SiO₂-Na₂O-TiO₂关系(a)和SiO₂-Al₂O₃关系(b)

底图据邱家骧和廖群安(1996)

Fig. 11. SiO₂-Na₂O-TiO₂ (a) and SiO₂-Al₂O₃ (b) of the clinopyroxene

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图 12 云母分类图(a)和云母的Fe³⁺-Fe²⁺-Mg图解(b)

a底图据Foster(1960)；b底图据Wones and Eugster(1965)

Fig. 12. Classification of micas (a) and Fe³⁺-Fe²⁺-Mg diagram (b)

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图 13 花岗岩类成因类型判别图解

底图据Whalen et al.(1987)

Fig. 13. Discrimination of granitoids genetic-types

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图 14 寄主岩和暗色微粒包体的CaO/Na₂O-Al₂O₃/TiO₂图解(a)和(Na₂O+K₂O)/(MgO+TFeO+TiO₂)-Na₂O+K₂O+MgO+TFeO+TiO₂图解(b)

图a底图据Sylvester(1998)；图b底图据Patino Douce(1999)

Fig. 14. CaO/Na₂O-Al₂O₃/TiO₂ (a) and (Na₂O+K₂O)/ (MgO+TFeO+TiO₂)-Na₂O+K₂O+MgO+TFeO+TiO₂ (b) diagrams

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图 15 MgO-TFeO图(a)和Al₂O₃/CaO-NaO/CaO图(b)

图a底图据Zorpi et al.(1989)

Fig. 15. Diagrams of MgO-TFeO (a) and Al₂O₃/CaO-NaO/CaO (b)

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图 16 Th_N/Yb_N-Nb_N/Th_N关系

Fig. 16. Relation of Th_N/Yb_N-Nb_N/Th_N

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表 1 寄主岩体及暗色微粒包体主量(%)、微量元素组成(10^-6)

Table 1. Major element (%) and trace element (10^-6) compositions of host rocks and mafic microgranular enclaves

样号	寄主岩				暗色微粒包体
样号	H1	H2	H3	H4	B-1-1	B-1-2	B-2	B-3	B-5	B-6	B-7	B-8	B-9
SiO₂	66.2	66.4	67.4	67.2	62.0	62.1	61.2	60.8	61.3	57.8	66.5	62.8	62.9
TiO₂	0.66	0.61	0.55	0.60	1.20	1.26	1.22	0.79	0.75	1.48	0.56	0.90	1.00
Al₂O₃	15.10	15.00	15.50	15.30	15.90	15.65	15.75	15.80	15.55	17.75	14.75	15.60	16.10
TFeO	5.11	4.71	4.37	4.69	7.75	7.62	7.60	7.04	6.57	8.19	4.71	6.61	6.90
MnO	0.08	0.07	0.07	0.07	0.10	0.10	0.10	0.15	0.14	0.10	0.09	0.10	0.09
MgO	1.56	1.44	1.28	1.40	2.29	2.23	2.42	2.64	2.61	2.33	1.60	2.05	2.12
CaO	3.17	3.08	3.25	2.88	3.66	3.73	3.87	5.89	5.28	4.37	3.24	2.64	3.77
Na₂O	3.12	3.11	3.36	3.01	3.56	3.54	3.63	3.78	3.56	4.21	2.76	2.58	3.87
K₂O	4.35	4.28	3.97	4.83	2.96	2.64	2.54	1.96	2.87	2.82	4.97	6.14	2.30
P₂O₅	0.17	0.16	0.14	0.16	0.26	0.25	0.31	0.17	0.19	0.37	0.14	0.26	0.29
SO₃	0.07	0.06	0.03	0.06	0.13	0.09	0.06	0.04	0.05	0.08	0.03	0.02	0.04
NiO	＜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
CuO	＜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
CoO	＜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
Cr₂O₃	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	＜0.01	0.02	0.01	0.01
BaO	0.07	0.07	0.06	0.09	0.04	0.03	0.02	0.02	0.05	0.02	0.09	0.07	0.03
LOI	0.32	0.79	0.45	0.42	0.41	0.36	0.68	0.43	0.28	0.35	0.31	0.61	0.48
Total	100.10	99.87	100.55	100.80	100.40	99.71	99.54	99.63	99.32	100.05	99.87	100.50	100.00
Mg^#	0.38	0.38	0.37	0.37	0.37	0.37	0.39	0.43	0.44	0.36	0.40	0.38	0.38
V	64	56	54	54	117	119	112	94	112	114	57	102	94
Cr	50	40	40	40	30	30	40	50	50	20	40	50	30
Ga	19.9	19.5	19.0	18.7	23.9	24.2	23.0	20.0	20.2	26.8	17.4	20.6	24.7
Rb	246	233	212	239	279	270	272	205	229	299	251	373	237
Sr	169.0	166.5	171.5	173.5	142.0	135.5	127.5	134.5	128.0	131.0	146.5	147.5	124.5
Y	30.3	28.6	25.9	27.4	48.4	55.7	33.3	28.4	41.4	51.8	23.6	29.5	40.7
Zr	246	235	202	223	242	242	335	153	246	672	175	278	421
Nb	13.9	13.1	11.6	12.4	22.9	22.9	18.8	14.4	15.0	20.7	11.5	14.9	20.1
Sn	7	7	6	5	9	9	5	6	7	6	4	4	6
Cs	21.10	19.05	16.25	12.55	24.60	23.10	24.60	15.40	24.70	20.50	11.30	16.05	18.70
Ba	598	592	530	761	310	298	142	126	446	164	778	568	206
Hf	6.1	5.9	5.2	5.7	5.8	5.8	8.5	3.7	5.9	16.6	4.1	6.9	10.3
Ta	1.4	1.4	1.3	1.4	2.8	3.1	1.2	1.1	1.1	1.3	0.9	1.0	1.6
W	2	4	3	2	1	2	2	2	3	4	1	2	1
Th	27.80	27.30	21.70	23.80	19.45	19.45	25.50	10.95	16.95	34.20	7.93	15.95	32.70
U	6.11	5.77	4.36	4.29	20.40	19.60	8.64	14.55	5.66	14.20	7.01	10.05	3.20
La	49.9	44.8	34.2	39.7	35.4	41.4	63.7	24.4	39.9	96.9	13.8	35.7	65.3
Ce	100.0	89.1	69.3	79.6	73.1	85.8	130.0	48.5	78.6	198.5	27.3	78.8	128.5
Pr	10.60	9.53	7.58	8.85	8.34	9.81	14.35	5.44	8.61	21.20	3.22	8.50	14.45
Nd	37.1	32.8	26.6	31.1	30.8	37.0	51.3	19.9	30.8	73.8	12.8	30.4	50.6
Sm	7.05	6.54	5.46	6.15	7.84	9.27	9.65	5.14	7.51	14.45	3.68	6.74	9.70
Eu	1.22	1.19	1.15	1.21	1.08	1.14	1.00	0.95	0.93	1.29	1.02	1.14	0.95
Gd	6.10	5.91	4.90	5.59	8.07	9.44	8.35	5.11	7.49	12.55	4.17	6.31	8.68
Tb	0.91	0.85	0.74	0.84	1.31	1.64	1.19	0.86	1.19	1.83	0.64	0.98	1.25
Dy	4.95	4.79	4.47	4.59	8.27	9.88	6.64	5.19	7.31	10.15	4.00	5.42	7.04
Ho	1.06	1.02	0.91	0.98	1.71	1.98	1.27	1.05	1.52	1.96	0.86	1.10	1.46
Er	3.18	2.79	2.79	2.75	4.73	5.62	3.29	2.99	4.27	5.30	2.47	3.10	4.02
Tm	0.47	0.44	0.40	0.40	0.67	0.83	0.44	0.41	0.58	0.67	0.32	0.43	0.54
Yb	2.66	2.65	2.45	2.57	4.09	4.66	2.49	2.55	3.72	3.93	2.07	2.40	3.23
Lu	0.48	0.41	0.39	0.39	0.60	0.68	0.38	0.44	0.58	0.60	0.34	0.38	0.53
ΣREE	225.68	202.82	161.34	184.72	186.01	219.15	294.05	122.93	193.01	443.13	76.69	181.40	296.25
LREE	205.87	183.96	144.29	166.61	156.56	184.42	270.00	104.33	166.35	406.14	61.82	161.28	269.50
HREE	19.81	18.86	17.05	18.11	29.45	34.73	24.05	18.60	26.66	36.99	14.87	20.12	26.75
LREE/HREE	10.39	9.75	8.46	9.20	5.32	5.31	11.23	5.61	6.24	10.98	4.16	8.02	10.07
La_N/Yb_N	13.46	12.13	10.01	11.08	6.21	6.37	18.35	6.86	7.69	17.69	4.78	10.67	14.50
δEu	0.57	0.59	0.68	0.63	0.42	0.37	0.34	0.57	0.38	0.29	0.80	0.53	0.32
δCe	1.07	1.06	1.06	1.04	1.04	1.04	1.05	1.03	1.04	1.07	1.00	1.11	1.03

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附表 1 长石化学成分(%)

附表 1. Chemical compositions of plagioclase(%)

样号	寄主岩																	暗色微粒包体
样号	1.1-1	1.1-2	1.1-3	1.1-4	1.1-5	1.1-6	1.1-7	1.1-8	1.2-1	1.6-1	1.6-2	1.6-4	1.6-5	1.6-6	7.3	7.4	7.6	6.2	6.7-1	6.7-2	6.7-3	6.7-3	7.1	7.2
SiO₂	56.15	55.24	58.36	58.16	59.02	58.99	59.48	61.18	58.47	59.62	56.26	59.08	59.48	60.72	60.79	57.77	56.69	58.40	58.00	58.39	56.49	55.47	57.69	60.93
TiO₂	0.04	0.07	0.00	0.02	0.01	0.01	0.00	0.02	0.02	0.02	0.03	0.06	0.02	0.04	0.00	0.00	0.00	0.00	0.05	0.00	0.07	0.03	0.06	0.03
Al₂O₃	26.89	24.68	27.06	26.58	26.54	25.64	25.54	25.08	25.29	25.33	25.80	24.71	24.86	23.27	24.32	27.92	26.41	26.15	25.24	25.55	24.93	25.94	25.77	25.22
TFeO	0.20	0.07	0.04	0.10	0.05	0.08	0.14	0.14	0.06	0.13	0.14	0.16	0.05	0.09	0.07	0.11	0.10	0.11	0.11	0.04	0.11	0.05	0.05	0.17
MnO	0.02	0.00	0.00	0.00	0.00	0.00	0.04	0.01	0.00	0.00	0.01	0.00	0.04	0.02	0.04	0.04	0.01	0.01	0.00	0.00	0.01	0.00	0.00	0.02
CaO	9.73	7.68	9.07	8.51	8.67	7.81	7.71	7.41	8.22	8.14	7.69	6.48	6.98	5.93	6.50	9.82	8.35	7.69	8.07	7.80	7.33	8.49	7.63	6.82
Na₂O	5.79	6.10	6.45	6.58	6.02	5.81	5.73	6.04	6.42	5.08	7.44	7.63	6.89	7.51	6.65	6.28	6.35	6.08	6.85	7.00	7.07	6.22	7.06	7.68
K₂O	0.41	0.20	0.23	0.33	0.35	0.36	0.37	0.36	0.42	0.56	0.47	0.44	0.42	0.55	0.35	0.29	0.31	0.19	0.35	0.44	0.55	0.30	0.31	0.25
Total	99.21	94.03	101.21	100.27	100.65	98.70	99.02	100.23	98.90	98.87	97.83	98.54	98.73	98.13	98.71	102.24	98.22	98.62	98.66	99.21	96.56	96.51	98.57	101.12
O=8
Si	2.55	2.62	2.58	2.60	2.62	2.66	2.67	2.71	2.64	2.68	2.59	2.68	2.68	2.75	2.73	2.54	2.59	2.64	2.63	2.63	2.63	2.58	2.62	2.69
Al	1.44	1.38	1.41	1.40	1.39	1.36	1.35	1.31	1.35	1.34	1.40	1.32	1.32	1.24	1.29	1.45	1.42	1.39	1.35	1.36	1.37	1.42	1.38	1.31
Ca	0.47	0.39	0.43	0.41	0.41	0.38	0.37	0.35	0.40	0.39	0.38	0.31	0.34	0.29	0.31	0.46	0.41	0.37	0.39	0.38	0.37	0.42	0.37	0.32
Na	0.51	0.56	0.55	0.57	0.52	0.51	0.50	0.52	0.56	0.44	0.66	0.67	0.60	0.66	0.58	0.54	0.56	0.53	0.60	0.61	0.64	0.56	0.62	0.66
K	0.02	0.01	0.01	0.02	0.02	0.02	0.02	0.02	0.02	0.03	0.03	0.03	0.02	0.03	0.02	0.02	0.02	0.01	0.02	0.03	0.03	0.02	0.02	0.01
An	47.04	40.48	43.17	40.90	43.42	41.67	41.64	39.50	40.42	45.24	35.43	31.15	35.02	29.39	34.28	45.59	41.32	40.65	38.66	37.15	35.28	42.25	36.75	32.45
Ab	50.63	58.25	55.55	57.24	54.53	56.07	55.98	58.23	57.11	51.05	61.99	66.35	62.49	67.36	63.51	52.79	56.84	58.17	59.36	60.36	61.60	56.00	61.48	66.14
Or	2.33	1.27	1.28	1.86	2.06	2.26	2.38	2.28	2.47	3.71	2.58	2.50	2.49	3.25	2.20	1.63	1.84	1.18	1.98	2.49	3.12	1.75	1.77	1.40
注：TFeO为全铁含量(下同).

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附表 2 辉石化学成分(%)

附表 2. Chemical compositions of pyroxene (%)

样号	寄主岩					暗色微粒包体
样号	1.4	1.5	1.8-1	1.8-2	7.7	3.1	3.2	3.4	3.4-1	3.4-2	3.4-3	6.4	6.5-1	6.5-2	6.8	7.2	7.5
SiO₂	50.99	50.14	50.63	53.13	51.82	49.53	51.42	53.84	40.85	53.26	47.47	51.36	51.06	50.30	49.99	49.84	48.90
TiO₂	0.07	0.04	0.11	0.12	0.00	0.07	0.08	0.01	17.69	0.26	0.27	0.10	0.04	0.08	0.07	0.02	0.02
Al₂O₃	0.60	3.16	1.08	0.84	0.91	6.97	1.51	2.16	1.43	1.66	2.84	0.61	0.76	1.40	0.44	1.02	0.57
TFeO	16.51	14.60	14.83	14.48	14.20	13.49	12.48	10.29	8.73	9.73	11.74	14.28	15.26	13.17	15.75	14.29	16.44
Cr₂O₃	0.00	0.01	0.03	0.00	0.03	0.01	0.02	0.05	0.04	0.08	0.03	0.05	0.09	0.00	0.01	0.09	0.02
MnO	1.02	0.98	0.89	0.86	0.82	0.73	0.67	0.50	0.31	0.53	0.52	0.90	0.83	0.89	0.84	0.85	1.12
MgO	8.09	8.58	8.90	9.03	8.76	9.79	10.78	10.88	7.00	11.42	11.22	9.87	9.76	9.80	8.32	8.62	8.44
CaO	22.81	22.45	22.10	21.84	22.43	20.42	21.80	21.06	22.38	22.57	20.61	22.73	21.66	21.64	23.07	22.39	21.46
Na₂O	0.37	0.35	0.59	0.47	0.32	0.31	0.37	0.85	0.26	0.49	0.54	0.29	0.33	0.37	0.17	0.35	0.39
Total	100.46	100.31	99.15	100.76	99.29	101.31	99.12	99.63	98.69	100.01	95.24	100.19	99.78	97.64	98.66	97.46	97.35
O=6
Si	1.978	1.926	1.972	2.017	2.003	1.855	1.972	2.016	1.601	1.995	1.899	1.975	1.974	1.971	1.973	1.974	1.963
Al(ⅳ)	0.022	0.074	0.028	0.000	0.000	0.145	0.028	0.000	0.522	0.005	0.101	0.025	0.026	0.029	0.002	0.026	0.001
Al(ⅵ)	0.005	0.069	0.022	0.037	0.041	0.163	0.040	0.096	0.000	0.068	0.033	0.002	0.009	0.036	0.000	0.022	0.000
Ti	0.002	0.001	0.003	0.004	0.000	0.002	0.002	0.000	0.522	0.007	0.008	0.003	0.001	0.002	0.002	0.001	0.001
Cr	0.000	0.000	0.001	0.000	0.001	0.000	0.001	0.001	0.001	0.002	0.001	0.002	0.003	0.000	0.000	0.003	0.001
Fe³⁺	0.060	0.041	0.065	0.000	0.000	0.000	0.014	0.000	0.000	0.000	0.138	0.056	0.055	0.024	0.064	0.040	0.114
Fe²⁺	0.473	0.426	0.415	0.462	0.460	0.423	0.386	0.325	0.297	0.307	0.250	0.401	0.437	0.406	0.453	0.432	0.433
Mn	0.034	0.032	0.029	0.028	0.027	0.023	0.022	0.016	0.010	0.017	0.018	0.029	0.027	0.029	0.028	0.028	0.038
Mg	0.468	0.492	0.517	0.511	0.505	0.547	0.616	0.607	0.409	0.638	0.669	0.566	0.563	0.572	0.490	0.509	0.505
Ca	0.948	0.924	0.922	0.888	0.929	0.820	0.896	0.845	0.940	0.905	0.883	0.936	0.897	0.908	0.975	0.951	0.923
Na	0.028	0.026	0.045	0.034	0.024	0.022	0.027	0.062	0.020	0.036	0.042	0.022	0.025	0.028	0.013	0.027	0.030
Wo	47.16	47.60	46.27	46.20	47.75	44.68	45.68	45.55	56.07	47.60	44.16	46.59	44.79	46.14	48.21	47.85	45.17
En	23.27	25.32	25.92	26.56	25.96	29.80	31.44	32.73	24.40	33.52	33.44	28.14	28.09	29.06	24.19	25.61	24.72
Fs	28.18	25.72	25.57	25.46	25.04	24.30	21.49	18.39	18.33	17.00	20.29	24.20	25.88	23.37	26.94	25.18	28.63
Ac	1.38	1.35	2.24	1.78	1.25	1.21	1.39	3.33	1.20	1.87	2.11	1.08	1.24	1.42	0.65	1.36	1.48
注：Al(ⅳ).四次配位铝；Al(ⅵ).六次配位铝.

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附表 3 黑云母化学成分(%)

附表 3. Chemical compositions of biotite (%)

样号	寄主岩			暗色微粒包体
样号	1.3	1.7	1.8	3.3	4.1	6.3
SiO₂	34.798	37.204	36.198	36.768	35.134	34.483
TiO₂	3.966	4.099	3.686	3.560	3.909	4.166
Al₂O₃	13.649	13.282	13.158	12.803	12.453	12.887
TFeO	23.188	23.097	22.881	20.370	23.842	22.568
MnO	0.308	0.281	0.334	0.295	0.328	0.291
MgO	8.247	7.916	7.305	9.884	8.059	8.051
CaO	0.087	0.058	0.109	0.071	0.055	0.063
Na₂O	0.269	0.274	0.451	0.271	0.339	0.169
K₂O	8.887	9.614	9.267	9.158	9.464	9.226
Total	93.400	95.825	93.389	93.181	93.583	91.904
O=11
Si	2.780 5	2.884 6	2.885 8	2.894 6	2.824 7	2.804 4
Al^Ⅳ	1.219 5	1.115 4	1.114 2	1.105 4	1.175 3	1.195 6
Al^Ⅵ	0.065 9	0.098 3	0.122 1	0.082 5	0.004 7	0.039 6
Ti	0.238 4	0.239 1	0.221 1	0.210 8	0.236 4	0.254 9
Fe³⁺	0.187 8	0.234 5	0.219 0	0.218 8	0.139 3	0.185 0
Fe²⁺	1.361 7	1.263 2	1.306 6	1.122 3	1.463 7	1.350 0
Mn	0.020 8	0.018 5	0.022 6	0.019 7	0.022 3	0.020 0
Mg	0.982 4	0.915 0	0.868 2	1.160 0	0.965 9	0.976 1
Ca	0.007 4	0.004 8	0.009 3	0.006 0	0.004 7	0.005 5
Na	0.041 7	0.041 2	0.069 7	0.041 4	0.052 8	0.026 6
K	0.905 9	0.951 0	0.942 5	0.919 8	0.970 7	0.957 2
Total	7.812 2	7.765 5	7.781 0		7.781 2	7.860 7	7.815 0

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