Discovery and Significance of Early Jurassic Bimodal Volcanic Rocks in Huoshaoyun, Karakoram

doi:10.19657/j.geoscience.1000-8527.2019.05.06

Abstract

Abstract:

The Karakoram volcanic rocks are close to the Qiao’er Tianshan Fault, and the two are closely space-time related. The SiO₂ contents of the basalt and dacite are of 48.84%-52.44% and 62.22%-65.63%, respectively. They have obvious Daly intercepts and are typically bimodal. Basalt has a low content of Al₂O₃, and high contents of MgO, CaO, TiO₂. Some trace elements (Sr, Ba) are strongly depleted, whereas the high field strength elements (HFSEs, e.g.Ta, Nb, Ti, Zr) are not depleted. Dacite has relatively high Al₂O₃, Na₂O and K₂O contents, but low MgO, CaO and TiO₂ contents, and are enriched in large ion lithophile elements (LILEs, e.g.Rb, Th, U, K), depleted of HFSEs, showing typical island arc geochemical affinity. Both the basalt and dacite are calc-alkaline, co-magmatic and likely formed in back-arc basins. Dacite may have formed from the fractionation of basaltic magma. LA-ICP-MS zircon U-Pb dating of the dacite yielded Early Jurassic age of (195.5±1.1) Ma. Considering the regional tectonic evolution, it is concluded that the Qiao’er Tianshan area may have been a developing backarc basin. We suggest that the lithospheric mantle of the basin during the volcanism had not been broken off and no oceanic crust was formed.

Key words: Karakoram, bimodal volcanism, basaltic rock, dacite

CLC Number:

P588.14
P597

ZHOU Nengwu, CHEN Bangxue, DENG Zhongfei, SANG Mingshuai, BAI Quanjin. Discovery and Significance of Early Jurassic Bimodal Volcanic Rocks in Huoshaoyun, Karakoram[J]. Geoscience, 2019, 33(05): 990-1002.

Figures/Tables 13

References 51

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测试点	含量/10^-6			同位素比值								年龄/Ma
测试点	Th	U		²³²Th/ ²³⁸U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	357	964	0.369 9		0.067 8	0.011 3	0.220 6	0.004 1	0.030 8	0.000 6	861		349	202	3	195	4
2	555	1 066	0.520 0		0.053 1	0.000 9	0.278 4	0.004 9	0.037 9	0.000 3	345		41	249	4	240	2
3	354	812	0.435 5		0.053 7	0.000 9	0.280 5	0.005 0	0.037 9	0.000 4	367		37	251	4	240	3
4	310	878	0.353 2		0.049 4	0.000 8	0.209 1	0.003 9	0.030 6	0.000 4	169		41	193	3	195	2
5	201	661	0.303 2		0.053 0	0.001 2	0.277 3	0.006 6	0.037 9	0.000 3	332		56	249	5	239	2
6	368	968	0.380 0		0.049 4	0.000 9	0.210 8	0.003 4	0.030 9	0.000 3	169		41	194	3	196	2
7	236	623	0.378 3		0.050 4	0.001 1	0.264 5	0.006 4	0.038 0	0.000 4	213		48	238	5	240	3
8	358	763	0.469 3		0.054 3	0.000 9	0.231 6	0.003 8	0.031 0	0.000 3	383		37	212	3	197	2
9	370	798	0.463 3		0.048 8	0.000 9	0.207 1	0.004 6	0.030 7	0.000 4	200		44	191	4	195	2
10	487	1 128	0.432 2		0.055 1	0.000 9	0.233 6	0.003 6	0.030 9	0.000 4	417		35	213	3	196	3
11	219	655	0.3347		0.049 8	0.001 2	0.208 3	0.005 3	0.030 9	0.000 4	183		59	192	4	196	2
12	267	713	0.374 4		0.049 7	0.001 0	0.259 8	0.005 1	0.037 9	0.000 3	189		51	235	4	240	2
13	363	805	0.451 0		0.052 7	0.001 1	0.275 3	0.005 4	0.037 9	0.000 4	322		14	247	4	240	3
14	343	946	0.362 6		0.052 9	0.001 1	0.223 9	0.004 5	0.030 9	0.000 5	324		50	205	4	196	3
15	391	845	0.462 3		0.060 5	0.002 2	0.288 6	0.010 4	0.034 4	0.000 6	633		78	257	8	218	3
16	297	838	0.354 2		0.050 6	0.000 9	0.215 6	0.004 3	0.030 8	0.000 4	220		36	198	4	196	2
17	332	849	0.391 2		0.049 4	0.001 2	0.258 9	0.005 4	0.038 0	0.000 3	169		56	234	4	240	2
18	842	1 101	0.765 3		0.087 9	0.002 6	0	0	0	0	1 381		58	0	0	0	0
19	416	1 046	0.398 0		0.068 5	0.010 4	0.244 6	0.003 6	0.030 8	0.000 4	883		319	222	3	196	3
20	426	1 208	0.352 7		0.054 6	0.000 7	0.231 4	0.003 7	0.030 7	0.000 3	398		31	211	3	195	2
21	252	819	0.308 0		0.051 1	0.001 2	0.216 3	0.005 2	0.030 7	0.000 3	256		54	199	4	195	2
22	265	813	0.326 1		0.049 7	0.000 9	0.212 3	0.004 1	0.030 9	0.000 2	189		41	196	3	196	2
23	343	981	0.350 1		0.055 4	0.000 9	0.233 4	0.003 7	0.030 7	0.000 4	428		35	213	3	195	2
24	334	964	0.346 3		0.050 3	0.000 9	0.213 3	0.004 2	0.030 7	0.000 4	209		41	196	3	195	2
25	352	945	0.372 9		0.055 3	0.001 0	0.237 4	0.003 6	0.030 9	0.000 5	433		41	216	3	196	3
26	281	870	0.323 3		0.051 1	0.000 9	0.217 6	0.003 9	0.030 9	0.000 4	256		38	200	3	196	2
27	267	826	0.323 3		0.052 9	0.000 8	0.223 8	0.004 0	0.030 7	0.000 4	324		40	205	3	195	3
28	376	965	0.389 7		0.056 5	0.002 0	0.291 3	0.020 2	0.037 8	0.001 2	472		78	260	16	239	7
29	275	823	0.334 6		0.078 0	0.023 8	0.485 1	0.190 8	0.038 2	0.001 3	1 147		634	402	131	241	8
30	270	820	0.329 4		0.050 2	0.001 2	0.211 7	0.005 1	0.030 6	0.000 4	211		56	195	4	194	2
31	417	1 140	0.365 6		0.049 9	0.000 9	0.211 3	0.004 7	0.030 6	0.000 4	191		43	195	4	194	3
32	541	947	0.571 5		0.060 8	0.001 0	0.582 5	0.262 7	0.036 5	0.001 6	632		33	466	170	231	10

测试点	含量/10^-6			同位素比值								年龄/Ma
测试点	Th	U		²³²Th/ ²³⁸U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
1	357	964	0.369 9		0.067 8	0.011 3	0.220 6	0.004 1	0.030 8	0.000 6	861		349	202	3	195	4
2	555	1 066	0.520 0		0.053 1	0.000 9	0.278 4	0.004 9	0.037 9	0.000 3	345		41	249	4	240	2
3	354	812	0.435 5		0.053 7	0.000 9	0.280 5	0.005 0	0.037 9	0.000 4	367		37	251	4	240	3
4	310	878	0.353 2		0.049 4	0.000 8	0.209 1	0.003 9	0.030 6	0.000 4	169		41	193	3	195	2
5	201	661	0.303 2		0.053 0	0.001 2	0.277 3	0.006 6	0.037 9	0.000 3	332		56	249	5	239	2
6	368	968	0.380 0		0.049 4	0.000 9	0.210 8	0.003 4	0.030 9	0.000 3	169		41	194	3	196	2
7	236	623	0.378 3		0.050 4	0.001 1	0.264 5	0.006 4	0.038 0	0.000 4	213		48	238	5	240	3
8	358	763	0.469 3		0.054 3	0.000 9	0.231 6	0.003 8	0.031 0	0.000 3	383		37	212	3	197	2
9	370	798	0.463 3		0.048 8	0.000 9	0.207 1	0.004 6	0.030 7	0.000 4	200		44	191	4	195	2
10	487	1 128	0.432 2		0.055 1	0.000 9	0.233 6	0.003 6	0.030 9	0.000 4	417		35	213	3	196	3
11	219	655	0.3347		0.049 8	0.001 2	0.208 3	0.005 3	0.030 9	0.000 4	183		59	192	4	196	2
12	267	713	0.374 4		0.049 7	0.001 0	0.259 8	0.005 1	0.037 9	0.000 3	189		51	235	4	240	2
13	363	805	0.451 0		0.052 7	0.001 1	0.275 3	0.005 4	0.037 9	0.000 4	322		14	247	4	240	3
14	343	946	0.362 6		0.052 9	0.001 1	0.223 9	0.004 5	0.030 9	0.000 5	324		50	205	4	196	3
15	391	845	0.462 3		0.060 5	0.002 2	0.288 6	0.010 4	0.034 4	0.000 6	633		78	257	8	218	3
16	297	838	0.354 2		0.050 6	0.000 9	0.215 6	0.004 3	0.030 8	0.000 4	220		36	198	4	196	2
17	332	849	0.391 2		0.049 4	0.001 2	0.258 9	0.005 4	0.038 0	0.000 3	169		56	234	4	240	2
18	842	1 101	0.765 3		0.087 9	0.002 6	0	0	0	0	1 381		58	0	0	0	0
19	416	1 046	0.398 0		0.068 5	0.010 4	0.244 6	0.003 6	0.030 8	0.000 4	883		319	222	3	196	3
20	426	1 208	0.352 7		0.054 6	0.000 7	0.231 4	0.003 7	0.030 7	0.000 3	398		31	211	3	195	2
21	252	819	0.308 0		0.051 1	0.001 2	0.216 3	0.005 2	0.030 7	0.000 3	256		54	199	4	195	2
22	265	813	0.326 1		0.049 7	0.000 9	0.212 3	0.004 1	0.030 9	0.000 2	189		41	196	3	196	2
23	343	981	0.350 1		0.055 4	0.000 9	0.233 4	0.003 7	0.030 7	0.000 4	428		35	213	3	195	2
24	334	964	0.346 3		0.050 3	0.000 9	0.213 3	0.004 2	0.030 7	0.000 4	209		41	196	3	195	2
25	352	945	0.372 9		0.055 3	0.001 0	0.237 4	0.003 6	0.030 9	0.000 5	433		41	216	3	196	3
26	281	870	0.323 3		0.051 1	0.000 9	0.217 6	0.003 9	0.030 9	0.000 4	256		38	200	3	196	2
27	267	826	0.323 3		0.052 9	0.000 8	0.223 8	0.004 0	0.030 7	0.000 4	324		40	205	3	195	3
28	376	965	0.389 7		0.056 5	0.002 0	0.291 3	0.020 2	0.037 8	0.001 2	472		78	260	16	239	7
29	275	823	0.334 6		0.078 0	0.023 8	0.485 1	0.190 8	0.038 2	0.001 3	1 147		634	402	131	241	8
30	270	820	0.329 4		0.050 2	0.001 2	0.211 7	0.005 1	0.030 6	0.000 4	211		56	195	4	194	2
31	417	1 140	0.365 6		0.049 9	0.000 9	0.211 3	0.004 7	0.030 6	0.000 4	191		43	195	4	194	3
32	541	947	0.571 5		0.060 8	0.001 0	0.582 5	0.262 7	0.036 5	0.001 6	632		33	466	170	231	10

编号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO		MgO		CaO		Na₂O	K₂O		P₂O₅		H₂O	烧失量
1611TSH-P-10	枕状玄武岩	52.30	3.55	10.83	5.48	4.54	0.15		5.87		8.27		2.27	3.55		0.35		0.57	2.92
1611TSH-P-11	枕状玄武岩	51.03	3.64	10.58	5.65	5.10	0.16		6.38		8.89		2.71	2.22		0.36		0.60	3.58
1611TSH-P-12	枕状玄武岩	50.88	3.63	10.68	5.31	5.33	0.14		6.34		9.05		2.00	3.34		0.34		0.53	2.97
PⅦ-9	玄武岩	52.44	3.44	9.99	7.01	3.80	0.13		5.88		10.34		4.39	0.25		0.33		0.32	1.89
PⅦ-10	玄武岩	51.65	3.51	10.60	7.27	3.99	0.13		5.98		9.16		4.74	0.37		0.34		0.32	1.94
PⅦ-11	玄武岩	48.84	3.63	10.29	7.26	4.67	0.14		7.33		10.05		3.98	0.54		0.35		0.60	2.95
0831-5	英安岩	62.22	0.73	15.60	2.16	1.56	0.07		3.08		3.21		4.46	3.31		0.19		0.50	2.78
1611TSH-7	英安岩	62.46	0.70	15.84	2.32	1.71	0.06		2.86		2.48		4.35	3.60		0.24		0.49	3.23
1611TSH-8	英安岩	64.72	0.48	15.71	1.21	1.27	0.07		2.16		3.32		3.31	3.54		0.22		0.63	3.74
1611TSH-9	英安岩	65.63	0.50	15.69	1.28	0.97	0.06		2.43		2.69		3.17	3.17		0.22		0.89	3.86
编号	岩性	Rb	Sr	Ba	Nb	Nb	Ta		Cr		Sc		Zr	Hf		Th		U	Ti
1611TSH-P-10	枕状玄武岩	77.40	97.30	364	30.40	30.40	1.90		241.00		17.70		249.00	7.00		4.48		0.89	21 277
1611TSH-P-11	枕状玄武岩	69.40	90.40	309	31.70	31.70	0.90		261.00		18.60		254.00	5.00		5.64		0.96	21 816
1611TSH-P-12	枕状玄武岩	82.10	97.70	267	31.70	31.70	0.75		244.00		18.80		250.00	5.50		5.71		0.96	21 756
PⅦ-9	玄武岩	5.90	180.00	38	35.30	35.30	2.44		391.00		25.40		243.00	3.80		2.50		1.01	20 650
PⅦ-10	玄武岩	8.19	179.00	63	33.70	33.70	2.21		369.00		25.10		250.00	5.10		3.32		0.72	19 211
PⅦ-11	玄武岩	14.90	215.00	74	36.80	36.80	2.57		491.00		26.70		257.00	5.00		3.46		0.83	21 199
0831-5	英安岩	115.00	401.00	653	23.10	23.10	1.79		53.10		15.20		164.00	4.90		13.70		3.86	4 325
1611TSH-7	英安岩	104.00	341.00	605	19.30	19.30	1.59		95.80		11.10		192.00	6.00		14.30		3.76	4 195
1611TSH-8	英安岩	124.00	237.00	571	20.90	20.90	1.50		59.20		8.88		187.00	5.50		16.80		9.17	2 877
1611TSH-9	英安岩	116.00	215.00	531	21.90	21.90	0.67		55.50		11.10		185.00	6.50		19.50		5.99	2 997
编号	岩性	K	P	Y	La	Ce	Pr		Nd		Sm		Eu	Gd		Tb		Dy	Ho
1611TSH-P-10	枕状玄武岩	30 318	1 573	24.40	37.90	76.20	9.97		45.40		8.75		2.54	8.27		1.16		6.42	1.08
1611TSH-P-11	枕状玄武岩	19 046	1 625	27.30	37.60	74.50	9.69		43.10		8.71		2.54	8.10		1.18		6.40	1.11
1611TSH-P-12	枕状玄武岩	28 560	1 530	26.60	36.90	75.60	9.91		43.89		8.45		2.55	8.29		1.20		6.43	1.09
PⅦ-9	玄武岩	2 074	1 441	19.90	31.40	68.90	8.97		38.50		8.20		2.30	7.67		1.30		7.60	1.30
PⅦ-10	玄武岩	3 070	1 485	20.10	31.60	64.90	8.43		36.30		7.67		2.19	7.09		1.24		7.25	1.23
PⅦ-11	玄武岩	4 481	1 528	20.20	32.30	68.10	9.01		39.10		8.57		2.39	8.01		1.37		7.91	1.38
0831-5	英安岩	27 466	830	19.10	39.70	74.70	8.01		30.40		5.51		1.34	5.26		0.89		5.50	1.01
1611TSH-7	英安岩	30 918	1 085	24.08	41.87	75.64	8.50		32.84		5.85		1.29	5.70		0.85		4.85	0.90
1611TSH-8	英安岩	30 594	1 000	24.78	49.20	88.50	10.13		38.30		6.78		1.29	6.41		0.86		4.84	0.85
1611TSH-9	英安岩	27 454	1 003	24.30	48.90	85.70	9.74		35.60		6.68		1.20	6.07		0.84		4.70	0.84
编号	岩性	Er	Tm	Yb	Lu	ΣREE		LREE		HREE		LREE/HREE			La_N/Yb_N		δEu			δCe
1611TSH-P-10	枕状玄武岩	2.80	0.39	2.18	0.32	203.38		180.76		22.62		7.99			12.47		0.90			0.94
1611TSH-P-11	枕状玄武岩	2.90	0.36	2.30	0.31	198.80		176.14		22.66		7.77			11.73		0.91			0.93
1611TSH-P-12	枕状玄武岩	2.80	0.35	2.19	0.31	199.96		177.30		22.66		7.82			12.09		0.92			0.95
PⅦ-9	玄武岩	3.35	0.46	2.73	0.45	183.13		158.27		24.86		6.37			8.25		0.87			0.99
PⅦ-10	玄武岩	3.29	0.45	2.59	0.40	174.63		151.09		23.54		6.42			8.75		0.89			0.96
PⅦ-11	玄武岩	3.61	0.51	3.05	0.41	185.72		159.47		26.25		6.08			7.60		0.87			0.96
0831-5	英安岩	3.28	0.49	3.13	0.50	179.72		159.66		20.06		7.96			9.10		0.75			0.97
1611TSH-7	英安岩	2.66	0.40	2.57	0.41	184.34		166.00		18.34		9.05			11.70		0.67			0.93
1611TSH-8	英安岩	2.43	0.37	2.44	0.35	212.75		194.20		18.55		10.47			14.46		0.59			0.92
1611TSH-9	英安岩	2.50	0.35	2.29	0.35	205.76		187.82		17.94		10.47			15.32		0.57			0.91

编号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO		MgO		CaO		Na₂O	K₂O		P₂O₅		H₂O	烧失量
1611TSH-P-10	枕状玄武岩	52.30	3.55	10.83	5.48	4.54	0.15		5.87		8.27		2.27	3.55		0.35		0.57	2.92
1611TSH-P-11	枕状玄武岩	51.03	3.64	10.58	5.65	5.10	0.16		6.38		8.89		2.71	2.22		0.36		0.60	3.58
1611TSH-P-12	枕状玄武岩	50.88	3.63	10.68	5.31	5.33	0.14		6.34		9.05		2.00	3.34		0.34		0.53	2.97
PⅦ-9	玄武岩	52.44	3.44	9.99	7.01	3.80	0.13		5.88		10.34		4.39	0.25		0.33		0.32	1.89
PⅦ-10	玄武岩	51.65	3.51	10.60	7.27	3.99	0.13		5.98		9.16		4.74	0.37		0.34		0.32	1.94
PⅦ-11	玄武岩	48.84	3.63	10.29	7.26	4.67	0.14		7.33		10.05		3.98	0.54		0.35		0.60	2.95
0831-5	英安岩	62.22	0.73	15.60	2.16	1.56	0.07		3.08		3.21		4.46	3.31		0.19		0.50	2.78
1611TSH-7	英安岩	62.46	0.70	15.84	2.32	1.71	0.06		2.86		2.48		4.35	3.60		0.24		0.49	3.23
1611TSH-8	英安岩	64.72	0.48	15.71	1.21	1.27	0.07		2.16		3.32		3.31	3.54		0.22		0.63	3.74
1611TSH-9	英安岩	65.63	0.50	15.69	1.28	0.97	0.06		2.43		2.69		3.17	3.17		0.22		0.89	3.86
编号	岩性	Rb	Sr	Ba	Nb	Nb	Ta		Cr		Sc		Zr	Hf		Th		U	Ti
1611TSH-P-10	枕状玄武岩	77.40	97.30	364	30.40	30.40	1.90		241.00		17.70		249.00	7.00		4.48		0.89	21 277
1611TSH-P-11	枕状玄武岩	69.40	90.40	309	31.70	31.70	0.90		261.00		18.60		254.00	5.00		5.64		0.96	21 816
1611TSH-P-12	枕状玄武岩	82.10	97.70	267	31.70	31.70	0.75		244.00		18.80		250.00	5.50		5.71		0.96	21 756
PⅦ-9	玄武岩	5.90	180.00	38	35.30	35.30	2.44		391.00		25.40		243.00	3.80		2.50		1.01	20 650
PⅦ-10	玄武岩	8.19	179.00	63	33.70	33.70	2.21		369.00		25.10		250.00	5.10		3.32		0.72	19 211
PⅦ-11	玄武岩	14.90	215.00	74	36.80	36.80	2.57		491.00		26.70		257.00	5.00		3.46		0.83	21 199
0831-5	英安岩	115.00	401.00	653	23.10	23.10	1.79		53.10		15.20		164.00	4.90		13.70		3.86	4 325
1611TSH-7	英安岩	104.00	341.00	605	19.30	19.30	1.59		95.80		11.10		192.00	6.00		14.30		3.76	4 195
1611TSH-8	英安岩	124.00	237.00	571	20.90	20.90	1.50		59.20		8.88		187.00	5.50		16.80		9.17	2 877
1611TSH-9	英安岩	116.00	215.00	531	21.90	21.90	0.67		55.50		11.10		185.00	6.50		19.50		5.99	2 997
编号	岩性	K	P	Y	La	Ce	Pr		Nd		Sm		Eu	Gd		Tb		Dy	Ho
1611TSH-P-10	枕状玄武岩	30 318	1 573	24.40	37.90	76.20	9.97		45.40		8.75		2.54	8.27		1.16		6.42	1.08
1611TSH-P-11	枕状玄武岩	19 046	1 625	27.30	37.60	74.50	9.69		43.10		8.71		2.54	8.10		1.18		6.40	1.11
1611TSH-P-12	枕状玄武岩	28 560	1 530	26.60	36.90	75.60	9.91		43.89		8.45		2.55	8.29		1.20		6.43	1.09
PⅦ-9	玄武岩	2 074	1 441	19.90	31.40	68.90	8.97		38.50		8.20		2.30	7.67		1.30		7.60	1.30
PⅦ-10	玄武岩	3 070	1 485	20.10	31.60	64.90	8.43		36.30		7.67		2.19	7.09		1.24		7.25	1.23
PⅦ-11	玄武岩	4 481	1 528	20.20	32.30	68.10	9.01		39.10		8.57		2.39	8.01		1.37		7.91	1.38
0831-5	英安岩	27 466	830	19.10	39.70	74.70	8.01		30.40		5.51		1.34	5.26		0.89		5.50	1.01
1611TSH-7	英安岩	30 918	1 085	24.08	41.87	75.64	8.50		32.84		5.85		1.29	5.70		0.85		4.85	0.90
1611TSH-8	英安岩	30 594	1 000	24.78	49.20	88.50	10.13		38.30		6.78		1.29	6.41		0.86		4.84	0.85
1611TSH-9	英安岩	27 454	1 003	24.30	48.90	85.70	9.74		35.60		6.68		1.20	6.07		0.84		4.70	0.84
编号	岩性	Er	Tm	Yb	Lu	ΣREE		LREE		HREE		LREE/HREE			La_N/Yb_N		δEu			δCe
1611TSH-P-10	枕状玄武岩	2.80	0.39	2.18	0.32	203.38		180.76		22.62		7.99			12.47		0.90			0.94
1611TSH-P-11	枕状玄武岩	2.90	0.36	2.30	0.31	198.80		176.14		22.66		7.77			11.73		0.91			0.93
1611TSH-P-12	枕状玄武岩	2.80	0.35	2.19	0.31	199.96		177.30		22.66		7.82			12.09		0.92			0.95
PⅦ-9	玄武岩	3.35	0.46	2.73	0.45	183.13		158.27		24.86		6.37			8.25		0.87			0.99
PⅦ-10	玄武岩	3.29	0.45	2.59	0.40	174.63		151.09		23.54		6.42			8.75		0.89			0.96
PⅦ-11	玄武岩	3.61	0.51	3.05	0.41	185.72		159.47		26.25		6.08			7.60		0.87			0.96
0831-5	英安岩	3.28	0.49	3.13	0.50	179.72		159.66		20.06		7.96			9.10		0.75			0.97
1611TSH-7	英安岩	2.66	0.40	2.57	0.41	184.34		166.00		18.34		9.05			11.70		0.67			0.93
1611TSH-8	英安岩	2.43	0.37	2.44	0.35	212.75		194.20		18.55		10.47			14.46		0.59			0.92
1611TSH-9	英安岩	2.50	0.35	2.29	0.35	205.76		187.82		17.94		10.47			15.32		0.57			0.91