Origin and Magmatic Evolution of the Neoproterozoic Dengganping Granite in Western Sichuan: Mineralogical Evidence from Plagioclase and Biotite

doi:10.19657/j.geoscience.1000-8527.2020.022

Abstract

Abstract:

The Neoproterozoic Dengganping granite is located in the middle part of the Longmenshan orogenic belt, which is in the transition zone between the eastern margin of the Qinghai-Tibet Plateau and the western margin of the Yangtze block. It is a typical area for studying the tectonic-magmatic evolution of the western margin of the Yangtze block. In this paper, field geological, petrographic and electron microprobe analyses were carried out on the Neoproterozoic Dengganping intrusion. We discuss the genetic features of plagioclase structure, compositional characteristics of biotite, and the magmatic evolution of the granite. The results show that the plagioclase in the Dengganping monzonitic granite has a simple “anti-ring” texture, mainly for the oligoclase (An_12.51Ab_47.43Or_40.06), In the syenogranite, the corrosive texture is clear, and alkaline feldspar predominates, most of which is sanidine (An_7.46Ab_42.39Or_50.16). Biotite in the granite is characterized by being Al-rich, Fe-rich, low-Mg and low-K, and belongs to iron biotite. Meanwhile, the I_Fe value is 0.47-0.50, indicating that the biotite was subjected to late fluid modification. Geochemical features of the biotite show that the Dengganping intrusion belongs to the peraluminous granite, whose formation was related to a crustal source. The crystallization pressure and depth are 1.81×10 ⁵-2.23×10 ⁵ Pa, 6.58-8.11 km, and the biotite crystallization temperature is 750-786 ℃. The granitic magma may have had high oxygen fugacity, belonging to the medium-deep formation phase. The results provide new evidence for the 800-740 Ma strongly-extensional magmatism in the Neoproterozoic western margin of the Yangtze block.

Key words: electron microprobe, plagioclase, Fe-biotite, peraluminous granite, Longmenshan orogenic belt

CLC Number:

P588.1
P597

LIU Hang, ZOU Hao, LI Yang, LI Xinyu, JIANG Xiuwei, ZHANG Qiang, LI Die. Origin and Magmatic Evolution of the Neoproterozoic Dengganping Granite in Western Sichuan: Mineralogical Evidence from Plagioclase and Biotite[J]. Geoscience, 2020, 34(05): 1043-1057.

Figures/Tables 13

References 64

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样品号	点号	岩性	SiO₂	Al₂O₃	CaO	Na₂O	K₂O	TiO₂	MgO	MnO	F	Cl	总量	An	Ab	Or	端元
Y0302	302-1	正长花岗岩	64.97	17.87	0	0.40	16.34	0.01	0	0.01	0.08	0.02	99.73	0.02	3.60	96.38	透长石
	302-2		64.76	17.80	0.01	0.45	16.36	0.01	0	0.01	0	0.03	99.52	0.06	4.03	95.91	透长石
	302-3		64.79	18.00	0.01	0.53	15.45	0	0.01	0	0	0.01	98.86	0.06	4.92	95.03	透长石
	302-4		63.34	22.66	1.69	8.51	1.97	0.01	0.28	0.04	0.16	0.02	99.11	8.68	79.26	12.06	歪长石
	302-5		63.84	22.51	1.09	8.99	1.87	0	0.15	0	0.10	0.01	98.90	5.56	83.07	11.37	歪长石
	302-6		65.85	21.49	1.21	9.84	1.16	0	0.16	0.02	0	0.01	99.97	5.92	87.28	6.79	钠长石
Y0414	414-01	正长花岗岩	63.73	17.83	0	0.15	16.15	0	0.01	0	0	0.11	98.20	0	1.38	98.62	透长石
	414-02		63.92	17.71	0	0.21	16.24	0.03	0.01	0.02	0.06	0.11	98.38	0	1.90	98.10	透长石
	414-05		67.57	19.88	1.18	10.80	0.24	0	0	0	0	0.03	99.86	5.61	93.05	1.34	钠长石
	414-06		67.64	20.07	0.86	10.85	0.34	0.01	0.01	0	0.18	0.02	100.10	4.12	93.95	1.92	钠长石
	414-07		67.41	20.14	0.12	11.06	0.68	0	0.03	0.01	0	0.02	99.60	0.58	95.55	3.87	透长石
	414-08		64.21	17.86	0	0.17	16.30	0.03	0	0.01	0.06	0.04	98.72	0	1.58	98.42	透长石
	414-09		64.67	17.83	0	0.13	16.63	0.02	0	0	0.11	0.03	99.42	0	1.14	98.86	透长石
	414-10		64.23	17.55	0.02	0.20	16.13	0	0	0.04	0.14	0.12	98.37	0.08	1.82	98.10	透长石
	414-11		67.36	20.25	0.51	10.65	0.73	0	0.03	0.01	0.08	0	99.79	2.47	93.31	4.21	钠长石
	414-12		67.68	19.77	0.25	10.69	0.63	0	0.02	0.01	0	0.02	99.24	1.24	95.08	3.68	钠长石
	414-13		67.61	20.17	0.38	10.90	0.57	0	0.02	0.01	0	0.02	99.79	1.84	94.90	3.26	钠长石
	414-16		64.45	17.97	0.04	0.16	16.75	0	0	0	0.08	0.02	99.54	0.20	1.43	98.37	钠长石
	414-17		64.47	17.76	0	0.18	16.72	0.02	0	0	0.03	0.04	99.34	0.01	1.57	98.42	歪长石
	414-18		65.19	21.90	0.26	9.32	2.07	0	0.15	0.03	0	0	99.75	1.31	86.13	12.56	透长石
	414-19		67.34	19.42	0.23	10.94	0.31	0	0.01	0	0	0.04	98.32	1.13	97.06	1.81	透长石
Y0412	412-01	正长花岗岩	64.46	17.71	0	0.15	16.61	0	0	0	0.25	0.05	99.20	0	1.32	98.68	透长石
	412-02		64.08	18.07	0.01	0.15	16.31	0	0	0.01	0.06	0.02	98.82	0.06	1.34	98.60	透长石
	412-04		67.48	20.18	0.16	10.79	1.01	0	0.06	0	0.18	0.01	100.13	0.77	93.49	5.73	钠长石
	412-05		97.38	0.58	0.02	0.04	0.10	0	0	0	0	0	98.12	7.85	33.74	58.41	透长石
	412-06		97.92	0.02	0.03	0	0	0	0	0.01	0.11	0	98.10	89.67	0	10.33	倍长石
	412-07		98.14	0.05	0.03	0	0	0	0	0	0.22	0	98.36	100.00	0	0	倍长石
	412-08		64.12	17.95	0.04	0.47	16.18	0	0	0	0	0.03	98.84	0.21	4.20	95.59	透长石
	412-09		64.17	17.83	0.02	0.23	16.25	0	0	0	0.03	0.01	98.81	0.10	2.14	97.76	透长石
	412-10		64.47	17.77	0	0.12	16.52	0	0	0	0	0.02	98.95	0	1.10	98.90	透长石
	412-11		68.76	19.22	0.11	11.50	0.15	0	0.02	0.01	0	0.01	99.82	0.53	98.64	0.83	钠长石
	412-12		69.19	19.54	0.10	11.26	0.19	0	0	0	0.18	0.02	100.44	0.50	98.42	1.08	钠长石
Y0411	411-01	二长花岗岩	64.66	17.97	0	0.54	15.98	0.01	0	0	0	0.02	99.24	0	4.87	95.13	透长石
	411-02		64.81	17.89	0.01	0.28	16.40	0.01	0.01	0	0	0.04	99.48	0.05	2.54	97.41	透长石
	411-03		65.50	17.95	0	0.40	16.18	0	0	0	0.14	0.01	100.17	0	3.63	96.37	透长石
	411-04		64.64	22.53	2.13	9.44	0.95	0	0	0	0.03	0.02	99.81	10.48	83.95	5.57	钠长石
	411-05		64.88	22.14	2.92	10.02	0.40	0	0	0	0	0.01	100.42	13.58	84.23	2.19	更长石
	411-06		65.21	21.71	3.06	9.75	0.29	0.01	0.02	0	0	0.02	100.19	14.53	83.84	1.63	更长石
Y0408	408-05	二长花岗岩	60.66	24.38	6.32	7.91	0.17	0.02	0.05	0	0.03	0.16	99.67	30.33	68.70	0.97	更长石
	408-06		59.87	24.60	5.05	7.27	1.29	0	0.08	0.03	0.13	0.37	98.67	25.58	66.62	7.80	更长石
	408-07		59.20	25.51	7.56	7.02	0.08	0	0	0.01	0	0.05	99.44	37.11	62.42	0.47	中长石
	408-08		60.99	23.97	5.48	8.15	0.36	0	0	0.01	0	0.13	99.11	26.51	71.42	2.07	更长石
	408-09		63.95	18.15	0	0.36	16.23	0.01	0	0	0	0.01	98.75	0.01	3.29	96.70	透长石
	408-10		64.59	18.09	0.01	0.55	16.01	0	0	0	0	0	99.32	0.03	4.94	95.03	透长石
	408-12		64.95	18.02	0	0.48	16.22	0	0	0	0.11	0	99.87	0	4.32	95.68	透长石
样品号	点号	岩性	SiO₂	Al₂O₃	CaO	Na₂O	K₂O	TiO₂	MgO	MnO	F	Cl	总量	An	Ab	Or	端元
Y0408	408-13	二长花岗岩	61.33	23.22	5.45	8.11	0.23	0	0.01	0	0.16	0	98.58	26.72	71.91	1.37	更长石
	408-15		64.61	17.81	0.01	0.73	15.93	0.02	0	0	0.03	0	99.23	0.05	6.48	93.46	透长石
	408-16		60.98	23.92	4.73	7.60	1.16	0	0.03	0.02	0.03	0.01	98.71	23.81	69.21	6.97	更长石
Y0402	402-01	二长花岗岩	62.74	22.44	4.66	8.76	0.31	0	0.01	0	0	0.02	99.05	22.33	75.91	1.76	更长石
	402-02		63.40	22.58	4.45	9.00	0.23	0	0.02	0.02	0.05	0	99.83	21.16	77.52	1.32	更长石
	402-03		64.97	21.54	3.09	9.65	0.20	0.01	0	0	0	0	99.54	14.88	83.95	1.16	更长石
	402-04		65.07	21.60	3.04	9.69	0.16	0.03	0	0.01	0	0	99.68	14.63	84.45	0.92	更长石
	402-05		63.10	22.98	4.46	8.73	0.28	0	0	0	0	0.02	99.71	21.64	76.75	1.60	更长石
	402-06		62.88	22.86	4.49	8.73	0.20	0.03	0.03	0	0	0	99.35	21.89	76.98	1.14	更长石
	402-07		64.92	21.90	3.21	9.79	0.15	0	0	0.02	0	0	100.08	15.21	83.96	0.83	更长石
	402-08		64.69	18.10	0	0.59	15.63	0.03	0	0.01	0	0	99.11	0	5.38	94.62	透长石
	402-09		64.17	17.88	0.01	0.25	16.23	0.05	0	0	0	0.04	98.63	0.03	2.26	97.71	透长石
	402-10		64.90	18.17	0	0.41	16.09	0.02	0.01	0	0.22	0.01	99.74	0	3.69	96.31	透长石
	402-11		63.04	23.14	4.12	8.59	0.28	0	0.04	0	0	0	99.34	20.62	77.74	1.64	更长石
	402-12		62.56	23.47	2.67	7.95	1.80	0	0.15	0	0.05	0.01	98.96	13.92	74.90	11.18	更长石
	402-13		64.92	17.98	0.03	0.54	16.30	0	0	0	0	0.01	99.86	0.15	4.77	95.08	透长石
	402-14		64.51	17.82	0.02	0.24	16.29	0	0	0	0.11	0.02	99.20	0.09	2.15	97.76	透长石

样品号	点号	岩性	SiO₂	Al₂O₃	CaO	Na₂O	K₂O	TiO₂	MgO	MnO	F	Cl	总量	An	Ab	Or	端元
Y0302	302-1	正长花岗岩	64.97	17.87	0	0.40	16.34	0.01	0	0.01	0.08	0.02	99.73	0.02	3.60	96.38	透长石
	302-2		64.76	17.80	0.01	0.45	16.36	0.01	0	0.01	0	0.03	99.52	0.06	4.03	95.91	透长石
	302-3		64.79	18.00	0.01	0.53	15.45	0	0.01	0	0	0.01	98.86	0.06	4.92	95.03	透长石
	302-4		63.34	22.66	1.69	8.51	1.97	0.01	0.28	0.04	0.16	0.02	99.11	8.68	79.26	12.06	歪长石
	302-5		63.84	22.51	1.09	8.99	1.87	0	0.15	0	0.10	0.01	98.90	5.56	83.07	11.37	歪长石
	302-6		65.85	21.49	1.21	9.84	1.16	0	0.16	0.02	0	0.01	99.97	5.92	87.28	6.79	钠长石
Y0414	414-01	正长花岗岩	63.73	17.83	0	0.15	16.15	0	0.01	0	0	0.11	98.20	0	1.38	98.62	透长石
	414-02		63.92	17.71	0	0.21	16.24	0.03	0.01	0.02	0.06	0.11	98.38	0	1.90	98.10	透长石
	414-05		67.57	19.88	1.18	10.80	0.24	0	0	0	0	0.03	99.86	5.61	93.05	1.34	钠长石
	414-06		67.64	20.07	0.86	10.85	0.34	0.01	0.01	0	0.18	0.02	100.10	4.12	93.95	1.92	钠长石
	414-07		67.41	20.14	0.12	11.06	0.68	0	0.03	0.01	0	0.02	99.60	0.58	95.55	3.87	透长石
	414-08		64.21	17.86	0	0.17	16.30	0.03	0	0.01	0.06	0.04	98.72	0	1.58	98.42	透长石
	414-09		64.67	17.83	0	0.13	16.63	0.02	0	0	0.11	0.03	99.42	0	1.14	98.86	透长石
	414-10		64.23	17.55	0.02	0.20	16.13	0	0	0.04	0.14	0.12	98.37	0.08	1.82	98.10	透长石
	414-11		67.36	20.25	0.51	10.65	0.73	0	0.03	0.01	0.08	0	99.79	2.47	93.31	4.21	钠长石
	414-12		67.68	19.77	0.25	10.69	0.63	0	0.02	0.01	0	0.02	99.24	1.24	95.08	3.68	钠长石
	414-13		67.61	20.17	0.38	10.90	0.57	0	0.02	0.01	0	0.02	99.79	1.84	94.90	3.26	钠长石
	414-16		64.45	17.97	0.04	0.16	16.75	0	0	0	0.08	0.02	99.54	0.20	1.43	98.37	钠长石
	414-17		64.47	17.76	0	0.18	16.72	0.02	0	0	0.03	0.04	99.34	0.01	1.57	98.42	歪长石
	414-18		65.19	21.90	0.26	9.32	2.07	0	0.15	0.03	0	0	99.75	1.31	86.13	12.56	透长石
	414-19		67.34	19.42	0.23	10.94	0.31	0	0.01	0	0	0.04	98.32	1.13	97.06	1.81	透长石
Y0412	412-01	正长花岗岩	64.46	17.71	0	0.15	16.61	0	0	0	0.25	0.05	99.20	0	1.32	98.68	透长石
	412-02		64.08	18.07	0.01	0.15	16.31	0	0	0.01	0.06	0.02	98.82	0.06	1.34	98.60	透长石
	412-04		67.48	20.18	0.16	10.79	1.01	0	0.06	0	0.18	0.01	100.13	0.77	93.49	5.73	钠长石
	412-05		97.38	0.58	0.02	0.04	0.10	0	0	0	0	0	98.12	7.85	33.74	58.41	透长石
	412-06		97.92	0.02	0.03	0	0	0	0	0.01	0.11	0	98.10	89.67	0	10.33	倍长石
	412-07		98.14	0.05	0.03	0	0	0	0	0	0.22	0	98.36	100.00	0	0	倍长石
	412-08		64.12	17.95	0.04	0.47	16.18	0	0	0	0	0.03	98.84	0.21	4.20	95.59	透长石
	412-09		64.17	17.83	0.02	0.23	16.25	0	0	0	0.03	0.01	98.81	0.10	2.14	97.76	透长石
	412-10		64.47	17.77	0	0.12	16.52	0	0	0	0	0.02	98.95	0	1.10	98.90	透长石
	412-11		68.76	19.22	0.11	11.50	0.15	0	0.02	0.01	0	0.01	99.82	0.53	98.64	0.83	钠长石
	412-12		69.19	19.54	0.10	11.26	0.19	0	0	0	0.18	0.02	100.44	0.50	98.42	1.08	钠长石
Y0411	411-01	二长花岗岩	64.66	17.97	0	0.54	15.98	0.01	0	0	0	0.02	99.24	0	4.87	95.13	透长石
	411-02		64.81	17.89	0.01	0.28	16.40	0.01	0.01	0	0	0.04	99.48	0.05	2.54	97.41	透长石
	411-03		65.50	17.95	0	0.40	16.18	0	0	0	0.14	0.01	100.17	0	3.63	96.37	透长石
	411-04		64.64	22.53	2.13	9.44	0.95	0	0	0	0.03	0.02	99.81	10.48	83.95	5.57	钠长石
	411-05		64.88	22.14	2.92	10.02	0.40	0	0	0	0	0.01	100.42	13.58	84.23	2.19	更长石
	411-06		65.21	21.71	3.06	9.75	0.29	0.01	0.02	0	0	0.02	100.19	14.53	83.84	1.63	更长石
Y0408	408-05	二长花岗岩	60.66	24.38	6.32	7.91	0.17	0.02	0.05	0	0.03	0.16	99.67	30.33	68.70	0.97	更长石
	408-06		59.87	24.60	5.05	7.27	1.29	0	0.08	0.03	0.13	0.37	98.67	25.58	66.62	7.80	更长石
	408-07		59.20	25.51	7.56	7.02	0.08	0	0	0.01	0	0.05	99.44	37.11	62.42	0.47	中长石
	408-08		60.99	23.97	5.48	8.15	0.36	0	0	0.01	0	0.13	99.11	26.51	71.42	2.07	更长石
	408-09		63.95	18.15	0	0.36	16.23	0.01	0	0	0	0.01	98.75	0.01	3.29	96.70	透长石
	408-10		64.59	18.09	0.01	0.55	16.01	0	0	0	0	0	99.32	0.03	4.94	95.03	透长石
	408-12		64.95	18.02	0	0.48	16.22	0	0	0	0.11	0	99.87	0	4.32	95.68	透长石
样品号	点号	岩性	SiO₂	Al₂O₃	CaO	Na₂O	K₂O	TiO₂	MgO	MnO	F	Cl	总量	An	Ab	Or	端元
Y0408	408-13	二长花岗岩	61.33	23.22	5.45	8.11	0.23	0	0.01	0	0.16	0	98.58	26.72	71.91	1.37	更长石
	408-15		64.61	17.81	0.01	0.73	15.93	0.02	0	0	0.03	0	99.23	0.05	6.48	93.46	透长石
	408-16		60.98	23.92	4.73	7.60	1.16	0	0.03	0.02	0.03	0.01	98.71	23.81	69.21	6.97	更长石
Y0402	402-01	二长花岗岩	62.74	22.44	4.66	8.76	0.31	0	0.01	0	0	0.02	99.05	22.33	75.91	1.76	更长石
	402-02		63.40	22.58	4.45	9.00	0.23	0	0.02	0.02	0.05	0	99.83	21.16	77.52	1.32	更长石
	402-03		64.97	21.54	3.09	9.65	0.20	0.01	0	0	0	0	99.54	14.88	83.95	1.16	更长石
	402-04		65.07	21.60	3.04	9.69	0.16	0.03	0	0.01	0	0	99.68	14.63	84.45	0.92	更长石
	402-05		63.10	22.98	4.46	8.73	0.28	0	0	0	0	0.02	99.71	21.64	76.75	1.60	更长石
	402-06		62.88	22.86	4.49	8.73	0.20	0.03	0.03	0	0	0	99.35	21.89	76.98	1.14	更长石
	402-07		64.92	21.90	3.21	9.79	0.15	0	0	0.02	0	0	100.08	15.21	83.96	0.83	更长石
	402-08		64.69	18.10	0	0.59	15.63	0.03	0	0.01	0	0	99.11	0	5.38	94.62	透长石
	402-09		64.17	17.88	0.01	0.25	16.23	0.05	0	0	0	0.04	98.63	0.03	2.26	97.71	透长石
	402-10		64.90	18.17	0	0.41	16.09	0.02	0.01	0	0.22	0.01	99.74	0	3.69	96.31	透长石
	402-11		63.04	23.14	4.12	8.59	0.28	0	0.04	0	0	0	99.34	20.62	77.74	1.64	更长石
	402-12		62.56	23.47	2.67	7.95	1.80	0	0.15	0	0.05	0.01	98.96	13.92	74.90	11.18	更长石
	402-13		64.92	17.98	0.03	0.54	16.30	0	0	0	0	0.01	99.86	0.15	4.77	95.08	透长石
	402-14		64.51	17.82	0.02	0.24	16.29	0	0	0	0.11	0.02	99.20	0.09	2.15	97.76	透长石

点号	岩性	SiO₂	TiO₂	Al₂O₃	TFeO	MnO	MgO	CaO	Na₂O	K₂O	F	Cl	总量	Si	Al^Ⅳ	Al^Ⅵ	Ti
408-1	二长花岗岩	36.85	3.44	15.40	19.31	0.68	9.09	0.06	0.07	9.68	0	0	94.58	5.63	2.37	0.41	0.39
408-2		36.66	3.77	15.56	19.10	0.72	8.90	0.03	0.06	9.67	0.02	0.02	94.51	5.61	2.39	0.41	0.43
408-3		36.64	2.62	15.63	18.75	0.71	9.85	0.03	0.06	9.42	0.38	0.01	94.10	5.66	2.34	0.50	0.30
408-11		36.64	2.88	15.13	19.59	0.87	9.79	0.03	0.08	9.38	0.26	0	94.65	5.64	2.36	0.38	0.33
408-14		36.79	3.30	15.27	19.23	0.80	9.58	0.07	0.08	9.57	0.21	0.01	94.91	5.63	2.37	0.39	0.38
408-17		36.00	3.27	15.43	19.26	0.81	9.40	0	0.07	9.67	0	0.02	93.93	5.63	2.37	0.40	0.37
408-18		36.64	3.02	16.11	19.23	0.82	9.81	0.08	0.08	9.31	0.35	0.01	95.46	5.58	2.42	0.47	0.35
408-19		36.39	3.03	15.29	19.11	0.70	9.41	0.11	0.08	9.40	0.14	0.01	93.67	5.63	2.37	0.42	0.35
408-20		36.90	3.42	15.28	18.6	0.76	9.59	0	0.07	9.73	0	0.02	94.37	5.64	2.36	0.39	0.39
点号	岩性	Fe³⁺	Fe²⁺	Mn	Mg	X	Y	Z	Ca	Na	K	I_Fe	I_Mg	I_MF	T^Al	p/kbar	h/km
408-1	二长花岗岩	2.08	0.09	2.07	1.92	5.43	8.00	0.01	0.02	1.89	0.50	0.49	0.98	2.77	1.88	6.83	0.39
408-2		0.39	2.05	0.09	2.03	1.91	5.41	8.00	0	0.02	1.89	0.50	0.49	0.97	2.80	1.97	7.16
408-3		0.37	2.05	0.09	2.27	1.88	5.58	8.00	0.01	0.02	1.86	0.47	0.51	1.03	2.84	2.08	7.58
408-11		0.37	2.15	0.11	2.25	1.87	5.60	8.00	0.01	0.02	1.84	0.49	0.50	1.00	2.74	0	0
408-14		0.38	2.09	0.10	2.19	1.90	5.52	8.00	0.01	0.02	1.87	0.49	0.50	1.00	2.75	1.82	6.60
408-17		0.38	2.07	0.10	2.13	1.90	5.47	8.00	0	0.02	1.88	0.49	0.50	0.99	2.77	1.86	6.77
408-18		0.38	2.07	0.11	2.23	1.85	5.60	8.00	0.01	0.02	1.81	0.48	0.51	1.01	2.89	2.23	8.11
408-19		0.38	2.10	0.09	2.17	1.90	5.51	8.00	0.02	0.02	1.86	0.49	0.50	1.00	2.79	1.92	6.99
408-20		0.37	2.00	0.10	2.19	1.92	5.45	8.00	0	0.02	1.90	0.48	0.51	1.02	2.75	1.81	6.58

点号	岩性	SiO₂	TiO₂	Al₂O₃	TFeO	MnO	MgO	CaO	Na₂O	K₂O	F	Cl	总量	Si	Al^Ⅳ	Al^Ⅵ	Ti
408-1	二长花岗岩	36.85	3.44	15.40	19.31	0.68	9.09	0.06	0.07	9.68	0	0	94.58	5.63	2.37	0.41	0.39
408-2		36.66	3.77	15.56	19.10	0.72	8.90	0.03	0.06	9.67	0.02	0.02	94.51	5.61	2.39	0.41	0.43
408-3		36.64	2.62	15.63	18.75	0.71	9.85	0.03	0.06	9.42	0.38	0.01	94.10	5.66	2.34	0.50	0.30
408-11		36.64	2.88	15.13	19.59	0.87	9.79	0.03	0.08	9.38	0.26	0	94.65	5.64	2.36	0.38	0.33
408-14		36.79	3.30	15.27	19.23	0.80	9.58	0.07	0.08	9.57	0.21	0.01	94.91	5.63	2.37	0.39	0.38
408-17		36.00	3.27	15.43	19.26	0.81	9.40	0	0.07	9.67	0	0.02	93.93	5.63	2.37	0.40	0.37
408-18		36.64	3.02	16.11	19.23	0.82	9.81	0.08	0.08	9.31	0.35	0.01	95.46	5.58	2.42	0.47	0.35
408-19		36.39	3.03	15.29	19.11	0.70	9.41	0.11	0.08	9.40	0.14	0.01	93.67	5.63	2.37	0.42	0.35
408-20		36.90	3.42	15.28	18.6	0.76	9.59	0	0.07	9.73	0	0.02	94.37	5.64	2.36	0.39	0.39
点号	岩性	Fe³⁺	Fe²⁺	Mn	Mg	X	Y	Z	Ca	Na	K	I_Fe	I_Mg	I_MF	T^Al	p/kbar	h/km
408-1	二长花岗岩	2.08	0.09	2.07	1.92	5.43	8.00	0.01	0.02	1.89	0.50	0.49	0.98	2.77	1.88	6.83	0.39
408-2		0.39	2.05	0.09	2.03	1.91	5.41	8.00	0	0.02	1.89	0.50	0.49	0.97	2.80	1.97	7.16
408-3		0.37	2.05	0.09	2.27	1.88	5.58	8.00	0.01	0.02	1.86	0.47	0.51	1.03	2.84	2.08	7.58
408-11		0.37	2.15	0.11	2.25	1.87	5.60	8.00	0.01	0.02	1.84	0.49	0.50	1.00	2.74	0	0
408-14		0.38	2.09	0.10	2.19	1.90	5.52	8.00	0.01	0.02	1.87	0.49	0.50	1.00	2.75	1.82	6.60
408-17		0.38	2.07	0.10	2.13	1.90	5.47	8.00	0	0.02	1.88	0.49	0.50	0.99	2.77	1.86	6.77
408-18		0.38	2.07	0.11	2.23	1.85	5.60	8.00	0.01	0.02	1.81	0.48	0.51	1.01	2.89	2.23	8.11
408-19		0.38	2.10	0.09	2.17	1.90	5.51	8.00	0.02	0.02	1.86	0.49	0.50	1.00	2.79	1.92	6.99
408-20		0.37	2.00	0.10	2.19	1.92	5.45	8.00	0	0.02	1.90	0.48	0.51	1.02	2.75	1.81	6.58