云南省卓潘碱性杂岩体矿物学、地球化学特征及其地质意义

摘要/Abstract

摘要：

卓潘杂岩体是金沙江—哀牢山富碱侵入岩带的重要组成部分,位于兰坪盆地西部。岩体主要由辉长岩、辉石岩及正长岩组成,各岩石的K₂O含量为0.96%~7.36%,Na₂O含量为0.52%~6.62%,Na₂O+K₂O含量为1.98%~8.97%,K₂O/Na₂O比值介于0.35~11.15之间,属于高钾、富碱的钾玄岩系列。岩石中的辉石为透辉石,长石主要为钠长石(An<5)和正长石,黑云母为镁质黑云母。计算获得辉石的结晶温度范围介于1 070~1 490 ℃之间。各矿物成分特征表明卓潘杂岩体属于富铁、高氧逸度的岩浆体系,形成于后碰撞的挤压环境向伸展环境转换的构造背景。

关键词: 卓潘碱性杂岩体, 电子探针, 辉石, 黑云母, 长石, 云南省

Abstract:

The Zhuopan alkaline complex is located in the western Lanping basin and is an important part of the Jinshajiang-Ailaoshan alkali-rich intrusion belt. The Zhuopan alkaline complex is mainly composed of gabbro, pyroxenolite and syenite,and their K₂O contents of the whole rock vary from 1.98% to 8.97%; the Na₂O contents are from 0.52% to 6.62%, the Na₂O+K₂O contents are from 1.98% to 8.97% and the K₂O/Na₂O ratios change between 0.35 and 11.15, indicating that they belong to the high K, alkali-rich shoshonite series.Electron microprobe analysis(EMPA)indicates that the pyroxene is dominated by the diopside; the feldspar is mainly albite (An<5) and orthoclase feldspar; and biotite is Mg-biotite in the complex rock.Pyroxene thermometer calculation shows that the crystallization temperature was from 1,070 to 1,490 ℃.According to the geochemical characteristics of the different rocks and minerals,we deduce that the Zhuopan alkaline complex was sourced from a magmatic system with high oxygen fugacity and iron content and formed in a transition tectonic setting changing from post collisional compression to extensional environment.

Key words: Zhuopan alkaline complex, EMPA, pyroxene, biotite, feldspar, Yunnan Province

中图分类号:

P588.12

李腾建, 张静, 佟子达, 潘泽伟. 云南省卓潘碱性杂岩体矿物学、地球化学特征及其地质意义[J]. 现代地质, 2017, 31(03): 474-485.

LI Tengjian, ZHANG Jing, TONG Zida, PAN Zewei. Mineralogical and Geochemical Characteristics of the Zhuopan Alkaline Complex in Yunnan Province and Their Geological Significance[J]. Geoscience, 2017, 31(03): 474-485.

图/表 13

参考文献 56

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样品编号	岩石类型	SiO₂	Al₂O₃	TFe₂O₃	CaO	MgO	Na₂O	K₂O	TiO₂	MnO	P₂O₅	烧失量	总计	Na₂O+K₂O
ZP-25	辉长岩	50.54	14.29	7.04	9.10	5.98	2.57	6.19	0.89	0.12	0.93	1.01	99.77	8.76
ZP-27	正长岩	49.07	14.95	9.01	5.05	5.80	0.66	7.36	1.27	0.15	1.28	3.88	99.71	8.02
ZP-31	辉长岩	48.07	9.25	10.30	15.95	6.45	1.35	3.29	1.30	0.19	1.55	0.55	100.02	4.64
ZP-32	辉长岩	47.50	9.93	11.48	15.35	5.87	1.41	3.05	1.55	0.21	1.02	0.64	99.98	4.46
ZP-33	辉石岩	48.43	5.15	8.28	20.00	12.75	0.68	1.52	0.87	0.17	0.91	0.90	100.21	2.20
ZP-34	正长岩	62.41	16.32	2.33	3.82	2.97	6.62	2.35	0.72	0.02	0.55	1.33	100.04	8.97
ZP-36	辉长岩	43.56	6.23	10.89	18.15	10.45	0.52	1.76	1.16	0.18	3.31	2.73	99.61	2.28
ZP-38	辉长岩	46.66	4.77	9.96	20.90	11.00	1.02	0.96	0.97	0.20	2.66	1.42	100.83	1.98
ZP-39	辉长岩	51.28	11.72	8.79	8.81	6.59	1.46	6.00	1.12	0.13	1.08	1.78	99.93	7.46
ZP-45	辉长岩	47.94	10.67	8.94	13.85	7.67	0.81	6.29	0.91	0.14	1.44	1.09	100.14	7.10
ZP-46	辉长岩	47.46	11.24	8.56	12.80	8.21	0.92	6.80	1.01	0.13	1.08	1.27	100.24	7.72

样品编号	岩石类型	SiO₂	Al₂O₃	TFe₂O₃	CaO	MgO	Na₂O	K₂O	TiO₂	MnO	P₂O₅	烧失量	总计	Na₂O+K₂O
ZP-25	辉长岩	50.54	14.29	7.04	9.10	5.98	2.57	6.19	0.89	0.12	0.93	1.01	99.77	8.76
ZP-27	正长岩	49.07	14.95	9.01	5.05	5.80	0.66	7.36	1.27	0.15	1.28	3.88	99.71	8.02
ZP-31	辉长岩	48.07	9.25	10.30	15.95	6.45	1.35	3.29	1.30	0.19	1.55	0.55	100.02	4.64
ZP-32	辉长岩	47.50	9.93	11.48	15.35	5.87	1.41	3.05	1.55	0.21	1.02	0.64	99.98	4.46
ZP-33	辉石岩	48.43	5.15	8.28	20.00	12.75	0.68	1.52	0.87	0.17	0.91	0.90	100.21	2.20
ZP-34	正长岩	62.41	16.32	2.33	3.82	2.97	6.62	2.35	0.72	0.02	0.55	1.33	100.04	8.97
ZP-36	辉长岩	43.56	6.23	10.89	18.15	10.45	0.52	1.76	1.16	0.18	3.31	2.73	99.61	2.28
ZP-38	辉长岩	46.66	4.77	9.96	20.90	11.00	1.02	0.96	0.97	0.20	2.66	1.42	100.83	1.98
ZP-39	辉长岩	51.28	11.72	8.79	8.81	6.59	1.46	6.00	1.12	0.13	1.08	1.78	99.93	7.46
ZP-45	辉长岩	47.94	10.67	8.94	13.85	7.67	0.81	6.29	0.91	0.14	1.44	1.09	100.14	7.10
ZP-46	辉长岩	47.46	11.24	8.56	12.80	8.21	0.92	6.80	1.01	0.13	1.08	1.27	100.24	7.72

样品编号		岩性		SiO₂		TiO₂			Al₂O₃		Cr₂O₃		FeO			MnO		MgO		CaO			Na₂O		K₂O		总计
ZP15-1		辉长岩		52.52		0.19			0.83		0.17		9.25			0.01		12.91		22.71			1.22		-		99.81
ZP15-19		辉长岩		42.79		1.04			10.48		0.09		13.75			0.03		13.89		11.70			3.00		0.83		97.60
ZP25-1		辉长岩		50.04		0.81			2.29		0.08		6.81			0.33		15.03		22.79			0.84		0		99.02
ZP25-2		辉长岩		50.99		0.58			1.57		0.02		6.36			0.26		15.31		22.95			0.87		-		98.91
ZP40-2		辉长岩		49.70		0.92			3.46		0.01		9.21			0.29		12.73		22.60			1.24		0.03		100.19
ZP40-4		辉长岩		49.46		1.02			3.35		0.02		9.67			0.39		12.54		22.41			1.30		0.05		100.21
ZP41-1		辉长岩		48.57		1.13			3.67		0.01		9.55			0.23		12.32		22.80			1.12		0		99.40
ZP45-1		辉长岩		50.16		0.80			2.43		0.01		7.67			-		13.84		23.28			0.97		-		99.16
ZP45-2		辉长岩		47.31		0.76			6.00		0.27		11.06			0.27		11.67		18.25			1.17		2.32		99.08
ZP46-1		辉长岩		50.45		0.86			2.99		0.10		6.25			0.07		14.66		23.30			1.1		0.03		99.81
ZP46-2		辉长岩		49.41		0.86			2.96		0.10		8.07			0.17		13.20		22.78			1.58		0.08		99.21
ZP46-5		辉长岩		50.72		0.83			2.93		0.01		7.75			0.21		13.68		23.35			1.15		0		100.63
样品编号	岩性		Si		Al^Ⅳ		Al^Ⅵ	Ti		Cr		Fe³⁺		Fe²⁺	Mn		Mg		Ca		Na	K		Wo		En		Fs
ZP15-1	辉长岩		1.976		0.024		0.012	0.005		0.005		0.126		0.162	0		0.724		0.915		0.089	0		47.489		37.56		14.951
ZP15-19	辉长岩		1.667		0.333		0.149	0.030		0.003		0.555		0	0.001		0.807		0.488		0.227	0.041		28.344		46.809		24.847
ZP25-1	辉长岩		1.888		0.023		0	0.023		0.002		0.201		0.011	0.011		0.845		0.921		0.061	0		46.330		42.515		11.155
ZP25-2	辉长岩		1.919		0.016		0	0.016		0.001		0.182		0.016	0.008		0.859		0.925		0.063	0		46.507		43.164		10.329
ZP40-2	辉长岩		1.872		0.128		0.026	0.026		0		0.209		0.077	0.009		0.715		0.912		0.091	0.001		47.476		37.204		15.319
ZP40-4	辉长岩		1.869		0.131		0.018	0.029		0.001		0.225		0.075	0.012		0.706		0.907		0.095	0.002		47.109		36.678		16.214
ZP41-1	辉长岩		1.851		0.149		0.016	0.032		0		0.221		0.078	0.007		0.700		0.931		0.083	0		48.060		36.131		15.808
ZP45-1	辉长岩		1.896		0.104		0.004	0.023		0		0.186		0.053	0		0.780		0.943		0.071	0		48.073		39.762		12.166
ZP45-2	辉长岩		1.823		0.177		0.095	0.022		0.008		0.337		0.009	0.009		0.670		0.753		0.087	0.114		42.352		37.684		19.964
ZP46-1	辉长岩		1.883		0.117		0.014	0.024		0.003		0.196		0	0.002		0.816		0.932		0.08	0.001		47.991		42.015		9.994
ZP46-2	辉长岩		1.876		0.124		0.008	0.025		0.003		0.269		0	0.005		0.747		0.927		0.116	0.004		48.022		38.713		13.265
ZP46-5	辉长岩		1.889		0.111		0.018	0.023		0		0.190		0.047	0.007		0.760		0.932		0.083	0		48.138		39.243		12.619

样品编号		岩性		SiO₂		TiO₂			Al₂O₃		Cr₂O₃		FeO			MnO		MgO		CaO			Na₂O		K₂O		总计
ZP15-1		辉长岩		52.52		0.19			0.83		0.17		9.25			0.01		12.91		22.71			1.22		-		99.81
ZP15-19		辉长岩		42.79		1.04			10.48		0.09		13.75			0.03		13.89		11.70			3.00		0.83		97.60
ZP25-1		辉长岩		50.04		0.81			2.29		0.08		6.81			0.33		15.03		22.79			0.84		0		99.02
ZP25-2		辉长岩		50.99		0.58			1.57		0.02		6.36			0.26		15.31		22.95			0.87		-		98.91
ZP40-2		辉长岩		49.70		0.92			3.46		0.01		9.21			0.29		12.73		22.60			1.24		0.03		100.19
ZP40-4		辉长岩		49.46		1.02			3.35		0.02		9.67			0.39		12.54		22.41			1.30		0.05		100.21
ZP41-1		辉长岩		48.57		1.13			3.67		0.01		9.55			0.23		12.32		22.80			1.12		0		99.40
ZP45-1		辉长岩		50.16		0.80			2.43		0.01		7.67			-		13.84		23.28			0.97		-		99.16
ZP45-2		辉长岩		47.31		0.76			6.00		0.27		11.06			0.27		11.67		18.25			1.17		2.32		99.08
ZP46-1		辉长岩		50.45		0.86			2.99		0.10		6.25			0.07		14.66		23.30			1.1		0.03		99.81
ZP46-2		辉长岩		49.41		0.86			2.96		0.10		8.07			0.17		13.20		22.78			1.58		0.08		99.21
ZP46-5		辉长岩		50.72		0.83			2.93		0.01		7.75			0.21		13.68		23.35			1.15		0		100.63
样品编号	岩性		Si		Al^Ⅳ		Al^Ⅵ	Ti		Cr		Fe³⁺		Fe²⁺	Mn		Mg		Ca		Na	K		Wo		En		Fs
ZP15-1	辉长岩		1.976		0.024		0.012	0.005		0.005		0.126		0.162	0		0.724		0.915		0.089	0		47.489		37.56		14.951
ZP15-19	辉长岩		1.667		0.333		0.149	0.030		0.003		0.555		0	0.001		0.807		0.488		0.227	0.041		28.344		46.809		24.847
ZP25-1	辉长岩		1.888		0.023		0	0.023		0.002		0.201		0.011	0.011		0.845		0.921		0.061	0		46.330		42.515		11.155
ZP25-2	辉长岩		1.919		0.016		0	0.016		0.001		0.182		0.016	0.008		0.859		0.925		0.063	0		46.507		43.164		10.329
ZP40-2	辉长岩		1.872		0.128		0.026	0.026		0		0.209		0.077	0.009		0.715		0.912		0.091	0.001		47.476		37.204		15.319
ZP40-4	辉长岩		1.869		0.131		0.018	0.029		0.001		0.225		0.075	0.012		0.706		0.907		0.095	0.002		47.109		36.678		16.214
ZP41-1	辉长岩		1.851		0.149		0.016	0.032		0		0.221		0.078	0.007		0.700		0.931		0.083	0		48.060		36.131		15.808
ZP45-1	辉长岩		1.896		0.104		0.004	0.023		0		0.186		0.053	0		0.780		0.943		0.071	0		48.073		39.762		12.166
ZP45-2	辉长岩		1.823		0.177		0.095	0.022		0.008		0.337		0.009	0.009		0.670		0.753		0.087	0.114		42.352		37.684		19.964
ZP46-1	辉长岩		1.883		0.117		0.014	0.024		0.003		0.196		0	0.002		0.816		0.932		0.08	0.001		47.991		42.015		9.994
ZP46-2	辉长岩		1.876		0.124		0.008	0.025		0.003		0.269		0	0.005		0.747		0.927		0.116	0.004		48.022		38.713		13.265
ZP46-5	辉长岩		1.889		0.111		0.018	0.023		0		0.190		0.047	0.007		0.760		0.932		0.083	0		48.138		39.243		12.619

样品编号	岩性	SiO₂	TiO₂		Al₂O₃		FeO		MnO	MgO		CaO		Na₂O		K₂O		总计
ZP27-3	辉长岩	63.57	0.46		19.77		0.15		0.07	0		0.37		2.49		12.65		99.53
ZP34-1	正长岩	67.56	-		19.53		0.19		0.04	-		0.23		11.93		0.48		99.96
ZP34-2	正长岩	66.89	-		20.06		0.12		0.09	0.03		0.85		11.73		0.27		100.04
ZP41-2	辉长岩	62.86	1.10		19.61		0.28		0.11	0.02		0.12		1.14		14.58		99.82
ZP43-2	辉长岩	63.06	1.09		20.10		0.46		0.02	0.01		0.29		2.69		12.17		99.89
ZP44-1	辉长岩	64.13	0.18		18.77		0.38		-	-		0.14		1.77		14.41		99.78
ZP44-3	辉长岩	63.87	0.35		18.70		0.15		0.07	-		0.13		1.73		14.51		99.51
样品编号	岩性	Si		Al		Ca		Na			K		An		Ab		Or
ZP27-3	辉长岩	2.93		1.09		0.02		0.22			0.75		1.86		22.60		75.54
ZP34-1	正长岩	2.98		1.01		0.01		1.01			0.03		1.03		96.42		2.55
ZP34-2	正长岩	2.95		1.04		0.04		1.00			0.02		3.80		94.77		1.44
ZP41-2	辉长岩	2.94		1.08		0.01		0.10			0.87		0.61		10.56		88.83
ZP43-2	辉长岩	2.92		1.10		0.01		0.24			0.72		1.48		24.77		73.75
ZP44-1	辉长岩	2.97		1.03		0.01		0.16			0.86		0.68		15.62		83.69
ZP44-3	辉长岩	2.96		1.03		0.01		0.16			0.87		0.63		15.24		84.12