阿尔巴尼亚布尔其泽纯橄岩壳中橄榄石的包裹体研究

熊发挥; 杨经绥; 徐向珍; 郝晓琳

doi:10.3799/dqkx.2018.405

阿尔巴尼亚布尔其泽纯橄岩壳中橄榄石的包裹体研究

doi: 10.3799/dqkx.2018.405

1.
中国地质科学院地质研究所国土资源部深地动力学重点实验室, 地幔研究中心, 北京 100037
2.
中地宝联(北京)国土资源勘查技术有限公司, 北京 100193

基金项目:

国家自然科学基金项目 41672046

中国地质调查局工作项目 DD20160023

国家自然科学基金项目 41641015

行业基金项目 201511022

国家自然科学基金项目 41502062

国家自然科学基金项目 41541017

详细信息

作者简介:
熊发挥(1985-), 男, 博士, 副研究员, 矿物学、岩石学、矿床学专业

通讯作者:
徐向珍

中图分类号: P315
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出版历程
- 收稿日期: 2017-10-01
- 刊出日期: 2018-05-15

Inclusions in Olivine and Implications-Based on Mineral Research of Dunite of Bulqiza Ophiolite, Albania

1.
Institute of Geology, Key Laboratory of Deep-Earth Dynamics of Ministry of Land and Resources, Chinese Academy of Geological Science, Beijing 100037, China
2.
Zhongdibaolian(Beijing) Land and Resources Exploration Technology Co. Ltd., Beijing 100193, China

摘要

摘要: 阿尔巴尼亚布尔其泽纯橄岩壳非常新鲜，主要由橄榄石、尖晶石和单斜辉石等矿物组成.其中橄榄石存在单斜辉石和铬尖晶石（磁铁矿）共生包裹体现象，包裹体矿物粒度在1~10 μm，有些甚至为纳米级200~500 nm.纯橄岩橄榄石的Fo值为94.7~96.0，铬尖晶石的Cr^#为76.5~82.4，远高于蛇绿岩地幔橄榄岩中常见纯橄岩的铬值（Cr^#>60）.基于前人研究结果，提出这种现象是由于亏损方辉橄榄岩与含钛、铬、铁熔体发生交代作用，从而形成橄榄石的固溶体并存在Ti⁴⁺、Al³⁺、Ca²⁺、Fe³⁺，而部分Cr³⁺进入铬尖晶石结晶.后期由于岩体在抬升过程中降温，橄榄石中混溶的组分析出包裹体形成磁铁矿和铬尖晶石.并且依据铬尖晶石-橄榄石的矿物化学成分，识别出岩体内方辉橄榄岩相对较低的部分熔融程度约为30%~40%，纯橄岩部分熔融程度约为40%，表明不同岩相间其形成背景存在明显差异.因此，认为布尔奇泽蛇绿岩具有多阶段的过程，首先是在洋中脊环境下经历部分熔融作用形成了方辉橄榄岩，后受到俯冲环境（SSZ）的岩石-熔体反应生成更富Mg、Si和Cr等的熔体，致使地幔橄榄岩高度部分熔融，形成此类纯橄岩.
- 纯橄岩 /
- 包裹体 /
- 布尔奇泽蛇绿岩岩体 /
- 阿尔巴尼亚 /
- 岩石学
Abstract: Cinopyroxene and spinel (magnetite) occur as oriented intergrowths within olivine of the dunite in the Bulqiza ophiolite, Albania. The size of the inclusion minerals is 1-10 μm, and some of them are nanoscale in 200-500 nm. The fresh dunite has a mineral assemblage of olivine, spinel and cinopyroxene. The Fo content of its olivine is 94.7-96.0, and the Cr^# of spinel is about 76.5-82.4, higher than that in the spinel in common dunite from ophiolite mantle (Cr^#>60). Thus it is proposed that previously depleted mantle harzburgite reacted with the melt containing Ti, Cr, Fe, and produced an olivine solid solution added with Ti⁴⁺, Al³⁺, Ca²⁺, Fe³⁺, and some of Cr³⁺ entered interstitial chromite. Due to the fast cooling rate of the rock or rapid tectonic emplacement, the exsolution textures in olivine and compositional zones of chromite are preserved. Based on the mineral compositions of chromian spinel-olivine, it is found that the relatively low partial melting degree of the harzburgite is 30%-40%, and the degree of partial melting of dunite is about 40%, indicating a significant difference of tectonic setting. It is suggested that the Bulqiza ophiolite had multi-stage evolution processes.When oceanic crustal slabs were trapped in mid ocean ridge, they were modified by tholeiitic magmas or partial melting, which occurred interaction or metasomatism, then later reaction with boninitic magma in suprasubduction zones (SSZ) generated more Mg, Si and Cr melt, resulting in high degree of partial melting for the mantle peridotite and dunite.
- dunite /
- inclusions /
- Bulqiza ophiolite /
- Albania /
- petrology

HTML全文

图 1 特提斯蛇绿岩的地质简图

据Xiong et al.(2015)修编

Fig. 1. Geological map of Tethys ophiolites

下载: 全尺寸图片幻灯片

图 2 阿尔巴尼亚Mirdita蛇绿岩带东段布尔奇泽蛇绿岩的地质简图

据Xiong et al.(2015)修编

Fig. 2. Geological map of Bulqiza ophiolites in the eastern of Mirdita suture from Albania

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图 3 布尔奇泽蛇绿岩岩相野外照片

a, b.纯橄岩壳与豆荚状铬铁矿共生照片；c.方辉橄榄岩；d.透镜状纯橄岩中新鲜的铬尖晶石

Fig. 3. Lithologies of Bulqiza ophiolite

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图 4 布尔奇泽各岩相镜下特征照片

a.方辉橄榄岩(正交偏光)；b.透镜状纯橄岩(正交偏光)；c.纯橄岩壳中橄榄石的定向包裹体(单偏光)；d.纯橄岩壳中橄榄石的定向包裹体(单偏光)；Ol.橄榄石；Spl.铬尖晶石；Opx.斜方辉石

Fig. 4. Photomicrographs of different lithologies from Bulqiza ophiolite

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图 5 布尔奇泽纯橄岩壳中橄榄石的铬尖晶石(磁铁矿)成分(Cr、Fe、Mg、Si、Al)面扫描图

铬尖晶石(磁铁矿)；Olivine.橄榄石

Fig. 5. X-ray element (Cr、Fe、Mg、Si、Al) maps showing chemical variations in the clinopyroxene, chromian spinel (magnetite) and olivine from Bulqiza high Cr^# dunite shell Spl(Mgt)

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图 6 纯橄岩壳中定向包体的激光拉曼谱图

Fig. 6. Laser Raman spectra of directional intergrowth inclusions from the dunite shell

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图 7 布尔奇泽纯橄岩壳中橄榄石的纳米级颗粒铬尖晶石(磁铁矿)和单斜辉石背散射照片

Cpx.单斜辉石；Spl.铬尖晶石；Ol.橄榄石

Fig. 7. Back scattered (BSE) images of the clinopyroxene and spinel (magnetite) intergrowths in the olivine from Bulqiza dunite

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图 8 布尔奇泽蛇绿岩中不同岩相的橄榄石成分图解

Fig. 8. Compositional range of olivine in different lithologies of the Bulqiza ophiolite

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图 9 布尔奇泽地幔橄榄岩中不同岩相中铬尖晶石-橄榄石化学成分图解

a.布尔奇泽地幔橄榄岩中铬尖晶石的Cr^# vs. Mg^#图解；b.地幔橄榄岩中铬尖晶石的Cr^# vs. TiO₂；c.地幔橄榄岩中铬尖晶石的Al₂O₃ vs. TiO₂；d.地幔橄榄岩中铬尖晶石的Cr^# vs.橄榄石的Fo值.方辉橄榄岩和铬铁矿的数据来源于Xiong et al.(2015)

Fig. 9. Mineral chemistry of different lithologies in spinel and olivine from Bulqiza ophiolite

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表 1 布尔奇泽橄榄岩中橄榄石的电子探针分析结果(%)

Table 1. Representative microprobe analyses of olivine from Bulqiza peridotite (%)

岩性	样品号	SiO₂	MgO	MnO	K₂O	Cr₂O₃	CaO	Al₂O₃	FeO	TiO₂	Na₂O	NiO	Total	Fo
纯橄岩壳	Al.6.4.3	41.87	52.39	0.03	0.00	0.01	0.03	0.00	4.18	0.00	0.01	0.60	99.11	95.72
	Al.6.4.3	41.57	52.53	0.05	0.01	0.03	0.02	0.00	4.17	0.00	0.00	0.63	99.00	95.74
	Al.6.4.3	41.69	51.83	0.06	0.01	0.04	0.02	0.00	5.20	0.01	0.00	0.49	99.35	94.67
	Al.6.4.3	42.04	51.74	0.11	0.03	0.00	0.00	0.00	5.33	0.02	0.00	0.59	99.86	94.54
	Al.6.4.3	41.05	54.01	0.08	0.00	0.02	0.03	0.00	4.27	0.00	0.00	0.56	100.02	95.75
透镜状纯橄岩	12Al.3.1	41.30	50.68	0.12	0.01	0.00	0.04	0.00	8.42	0.00	0.00	0.24	100.80	91.48
	12Al.5.2	41.39	50.72	0.11	0.00	0.01	0.05	0.00	8.18	0.00	0.01	0.39	100.85	91.71
	12Al.5.5	41.93	50.16	0.10	0.00	0.02	0.03	0.02	8.04	0.00	0.01	0.35	100.65	91.75
	12Al.5.7	41.33	50.61	0.12	0.01	0.02	0.03	0.00	8.16	0.00	0.00	0.36	100.64	91.70
	12Al.5.8	40.96	50.45	0.12	0.03	0.03	0.00	0.00	7.86	0.01	0.00	0.37	99.82	91.96

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表 2 布尔奇泽橄榄岩中铬尖晶石的电子探针分析结果(%)

Table 2. Representative microprobe analyses of chromian spinels from Bulqiza peridotite (%)

岩性	样品	Cr₂O₃	Al₂O₃	MgO	FeO	MnO	CaO	K₂O	Na₂O	TiO₂	SiO₂	NiO	Total	Mg^#	Cr^#
纯橄岩壳	12Al.6.4	58.81	11.18	14.06	15.27	0.21	0.00	0.01	0.01	0.16	0.02	0.11	99.84	62.50	77.92
	12Al.6.4	58.27	11.18	14.16	15.63	0.30	0.00	0.00	0.01	0.14	0.00	0.08	99.76	62.00	77.76
	12Al.6.4	58.23	11.48	13.96	15.38	0.30	0.00	0.00	0.00	0.16	0.01	0.17	99.69	62.13	77.28
	12Al.6.2	60.77	8.69	12.62	17.35	0.33	0.00	0.00	0.00	0.10	0.03	0.03	99.93	56.78	82.43
	12Al.6.2	61.05	8.66	12.57	17.18	0.30	0.02	0.01	0.00	0.04	0.00	0.06	99.89	56.69	82.54
透镜状纯橄岩	12Al.3.1	57.18	10.65	9.72	21.07	0.40	0.00	0.00	0.04	0.15	0.05	0.06	99.31	45.66	78.27
	12Al.3.1	56.97	10.35	9.90	21.31	0.47	0.00	0.00	0.01	0.17	0.06	0.00	99.24	45.81	78.69
	12Al.5.1	56.71	11.72	8.90	21.73	0.42	0.02	0.01	0.01	0.05	0.03	0.07	99.67	42.47	76.45
	12Al.5.3	55.61	10.97	8.26	23.57	0.44	0.00	0.01	0.00	0.07	0.09	0.02	99.03	38.98	77.28
	12Al.5.4	56.57	11.13	8.69	22.27	0.44	0.00	0.01	0.01	0.00	0.04	0.04	99.18	41.27	77.33

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