Records of Middle-Late Triassic Plate Collision Events on the West Qinling: Evidence from Zircon U-Pb Age and Geochemistry of the Volcanic Rocks in the Hezuo Area

doi:10.19657/j.geoscience.1000-8527.2021.120

Abstract

Abstract:

Strong magmatic activities dominated by the Indosinian high potassic calc-alkaline granitoids in Western Qinling orogenic belt. A small number of volcanic rocks were developed. The volcanic rocks from the Hezuo area of West Qinling,as reposed in this paper,are intermediate-acid rocks which contain mainly tuffaceous lava with volcanic breccia and dacite.The andesite was limited by the zircon U-Pb age of (237.7±1.9) Ma in the Dewulu area,the andesite was limited by the zircon U-Pb age of (234.8±2.1) Ma in the Zhayougoukou area, indicating that these volcanic rocks erupted in the early Late Triassic. The results show that andesite belongs to the calc-alkaline series and shows the characteristics of potassium-rich volcanic rocks. They are characterized by enrichment in Rb,Ba,Th,U,La,Ce,Sr,low REE(LREE/HREE=6.79-17.15) and relative depletion in δEu(δEu=0.76-0.86).Hezuo volcanic rocks were generated by the mantle, some of them might also be related to the contamination of upper crustal materials. Strong extrusion and subduction proceed between some small ocean basins and some small plates, when the initial collision between the North China block and Yangtze block. The mantle materials were contaminated with upper crustal materials and the magma rose after the initial collision. A series of volcanic rocks of different time periods were formed in the late Triassic after repetitive plate collisional crushing-relaxation.

Key words: Western Qinling, Hezuo area, Indosinian, volcanic rock, plate collision

CLC Number:

P588.1

YANG Weigang, LI Yongsheng, LI Tongyuan, ZHANG Jun, REN Pengfei. Records of Middle-Late Triassic Plate Collision Events on the West Qinling: Evidence from Zircon U-Pb Age and Geochemistry of the Volcanic Rocks in the Hezuo Area[J]. Geoscience, 2021, 35(06): 1691-1701.

Figures/Tables 9

References 31

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测点号	元素含量/10^-6			Th/U	同位素比值						年龄/Ma				谐和度/%
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	谐和度/%
D0085TW1-01	22.51	128.0	389	0.33	0.054 9	0.004 0	0.285 1	0.020 0	0.038 7	0.000 5	255	15.788 380	245	3.231 400	96
D0085TW1-02	32.98	144.0	777	0.19	0.055 7	0.001 7	0.292 2	0.009 2	0.037 8	0.000 3	260	7.254 829	239	2.106 785	91
D0085TW1-03	17.46	145.0	388	0.37	0.053 5	0.002 0	0.286 7	0.010 2	0.038 8	0.000 3	256	8.025 698	245	2.172 178	95
D0085TW1-05	19.21	180.0	429	0.42	0.053 6	0.002 0	0.281 6	0.010 4	0.037 9	0.000 4	252	8.250 234	240	2.551 136	95
D0085TW1-06	17.51	129.0	405	0.32	0.054 3	0.002 0	0.282 0	0.010 2	0.037 6	0.000 4	252	8.041 648	238	2.577 400	94
D0085TW1-07	19.18	135.0	429	0.31	0.052 0	0.002 4	0.276 0	0.009 9	0.038 5	0.000 5	247	7.865 193	243	2.910 820	98
D0085TW1-08	23.91	210.0	560	0.38	0.052 8	0.001 9	0.268 4	0.009 5	0.036 6	0.000 3	241	7.606 676	232	2.050 042	95
D0085TW1-09	25.53	173.0	597	0.29	0.050 4	0.001 9	0.263 3	0.009 6	0.037 8	0.000 3	237	7.741 053	239	2.153 142	99
D0085TW1-10	23.74	231.0	532	0.43	0.056 5	0.001 9	0.291 2	0.009 2	0.037 4	0.000 4	260	7.241 432	237	2.426 399	90
D0085TW1-12	28.16	317.0	645	0.49	0.051 5	0.001 8	0.260 8	0.008 9	0.036 5	0.000 3	235	7.177 285	231	2.151 122	98
D0085TW1-13	54.70	423.0	944	0.45	0.049 2	0.006 7	0.288 5	0.042 4	0.037 9	0.000 5	257	33.403 980	240	2.983 798	92
D0085TW1-14	43.50	489.0	893	0.55	0.048 9	0.001 7	0.253 9	0.008 3	0.037 6	0.000 3	230	6.711 322	238	2.144 931	96
D0085TW1-15	40.40	270.0	818	0.33	0.051 3	0.003 4	0.265 6	0.016 6	0.038 1	0.000 4	239	13.282 880	241	2.474 921	99
D0085TW1-16	17.66	153.0	406	0.38	0.056 4	0.002 6	0.284 1	0.010 9	0.036 5	0.000 3	254	8.628 553	231	2.139 124	90
D0085TW1-17	16.50	146.0	378	0.39	0.056 1	0.002 3	0.288 3	0.011 5	0.037 3	0.000 4	257	9.092 249	236	2.585 671	91
D0085TW1-18	20.42	166.0	468	0.35	0.050 1	0.001 9	0.262 5	0.009 6	0.038 1	0.000 4	237	7.726 323	241	2.341 736	98
D0085TW1-19	19.66	126.0	470	0.27	0.053 3	0.002 1	0.273 0	0.010 5	0.037 1	0.000 4	245	8.381 644	235	2.268 960	95
D0085TW1-20	18.46	150.0	425	0.35	0.056 8	0.002 2	0.297 7	0.012 0	0.038 1	0.000 5	265	9.386 168	241	3.115 617	90
D0085TW1-21	19.67	107.0	462	0.23	0.056 8	0.002 0	0.293 4	0.009 4	0.037 6	0.000 4	261	7.420 364	238	2.389 572	90
D0085TW1-22	12.02	97.3	281	0.35	0.056 2	0.002 3	0.284 7	0.011 4	0.036 8	0.000 5	254	9.010 816	233	2.986 493	91
D0085TW1-23	15.82	139.0	359	0.39	0.055 0	0.002 2	0.290 7	0.011 8	0.038 4	0.000 5	259	9.307 737	243	3.326 981	93
D0085TW1-24	24.30	283.0	547	0.52	0.052 3	0.002 0	0.267 7	0.009 8	0.037 2	0.000 4	241	7.825 648	235	2.380 378	97
D0085TW1-11	22.13	158.0	473	0.33	0.058 6	0.002 2	0.342 6	0.013 8	0.041 9	0.000 6	299	10.406 360	265	3.561 365	87
D0085TW1-04	40.50	207.0	626	0.33	0.070 6	0.006 5	0.366 1	0.036 5	0.035 6	0.000 5	317	27.124 370	225	3.114 964	66
PM101TW2-01	24.99	165.0	613	0.27	0.054 6	0.002 6	0.288 2	0.013 3	0.037 6	0.000 7	257	10.499 000	238	4.542 506	92
PM101TW2-02	5.84	59.2	133	0.44	0.054 7	0.003 3	0.280 0	0.015 3	0.036 9	0.000 7	251	12.150 970	233	4.144 204	92
PM101TW2-03	15.64	329.0	326	1.01	0.050 6	0.002 5	0.250 9	0.012 0	0.035 8	0.000 4	227	9.761 162	227	2.538 879	99
PM101TW2-04	32.20	508.0	748	0.68	0.055 7	0.002 0	0.290 4	0.012 2	0.037 9	0.000 7	259	9.573 867	240	4.317 905	92
PM101TW2-05	15.18	232.0	313	0.74	0.051 5	0.002 3	0.269 5	0.011 4	0.038 0	0.000 5	242	9.120 963	241	2.932 484	99
PM101TW2-06	8.72	111.0	190	0.59	0.053 2	0.003 3	0.271 4	0.015 9	0.037 2	0.000 5	244	12.692 780	235	3.087 314	96
PM101TW2-07	16.69	248.0	342	0.72	0.052 1	0.002 4	0.273 7	0.012 1	0.038 5	0.000 5	246	9.645 849	243	2.881 212	99
PM101TW2-08	31.22	105.0	778	0.13	0.050 7	0.001 7	0.257 4	0.008 2	0.036 7	0.000 3	233	6.587 073	232	2.142 391	99
PM101TW2-09	22.46	225.0	503	0.45	0.050 3	0.001 8	0.261 2	0.009 0	0.037 7	0.000 4	236	7.246 052	238	2.454 537	98
PM101TW2-10	47.22	218.0	1123	0.19	0.052 5	0.001 4	0.273 5	0.007 4	0.037 6	0.000 4	246	5.939 210	238	2.293 911	96
PM101TW2-11	23.15	121.0	558	0.22	0.049 1	0.001 8	0.259 5	0.009 1	0.038 4	0.000 5	234	7.350 808	243	2.949 178	96
PM101TW2-12	27.68	123.0	676	0.18	0.050 2	0.001 6	0.257 8	0.008 2	0.037 2	0.000 4	233	6.638 558	235	2.233 841	98
PM101TW2-13	8.81	84.6	195	0.43	0.052 2	0.003 0	0.273 6	0.014 7	0.038 3	0.000 5	246	11.713 420	242	3.087 143	98
PM101TW2-14	14.68	135.0	328	0.41	0.056 3	0.002 5	0.295 5	0.013 2	0.038 1	0.000 4	263	10.382 300	241	2.726 287	91
PM101TW2-15	7.23	121.0	163	0.74	0.055 6	0.003 3	0.269 4	0.012 8	0.035 6	0.000 7	242	10.206 910	226	4.322 975	92
PM101TW2-16	12.91	211.0	270	0.78	0.053 2	0.002 7	0.270 5	0.013 2	0.037 0	0.000 4	243	10.589 590	234	2.729 670	96
PM101TW2-17	20.74	56.5	508	0.11	0.051 1	0.002 0	0.268 6	0.010 4	0.038 0	0.000 4	242	8.332 940	241	2.785 187	99
PM101TW2-18	10.63	126.0	244	0.52	0.050 4	0.002 8	0.252 7	0.013 8	0.036 3	0.000 5	229	11.178 250	230	2.985 580	99
PM101TW2-19	11.68	31.7	300	0.11	0.047 2	0.002 5	0.237 9	0.012 5	0.036 3	0.000 4	217	10.280 860	230	2.665 503	94
测点号	元素含量/10^-6			Th/U	同位素比值						年龄/Ma				谐和度/%
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	谐和度/%
PM101TW2-20	35.73	213.0	874	0.24	0.052 3	0.001 8	0.267 1	0.009 0	0.036 7	0.000 4	240	7.221 691	233	2.299 552	96
PM101TW2-21	39.42	228.0	985	0.23	0.048 6	0.001 5	0.244 0	0.007 5	0.036 0	0.000 3	222	6.130 708	228	2.009 034	97
PM101TW2-22	36.55	427.0	837	0.51	0.051 6	0.001 5	0.261 4	0.007 4	0.036 3	0.000 3	236	5.947 337	230	1.959 542	97
PM101TW2-23	38.00	452.0	831	0.54	0.052 4	0.001 6	0.276 5	0.008 8	0.037 8	0.000 4	248	6.963 153	239	2.462 736	96
PM101TW2-24	9.31	124.0	205	0.60	0.053 6	0.003 0	0.272 3	0.014 7	0.036 6	0.000 5	245	11.750 520	232	3.051 353	94
PM101TW2-25	8.78	99.1	196	0.51	0.047 9	0.003 0	0.246 8	0.015 1	0.037 3	0.000 6	224	12.315 210	236	3.442 544	94

测点号	元素含量/10^-6			Th/U	同位素比值						年龄/Ma				谐和度/%
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	谐和度/%
D0085TW1-01	22.51	128.0	389	0.33	0.054 9	0.004 0	0.285 1	0.020 0	0.038 7	0.000 5	255	15.788 380	245	3.231 400	96
D0085TW1-02	32.98	144.0	777	0.19	0.055 7	0.001 7	0.292 2	0.009 2	0.037 8	0.000 3	260	7.254 829	239	2.106 785	91
D0085TW1-03	17.46	145.0	388	0.37	0.053 5	0.002 0	0.286 7	0.010 2	0.038 8	0.000 3	256	8.025 698	245	2.172 178	95
D0085TW1-05	19.21	180.0	429	0.42	0.053 6	0.002 0	0.281 6	0.010 4	0.037 9	0.000 4	252	8.250 234	240	2.551 136	95
D0085TW1-06	17.51	129.0	405	0.32	0.054 3	0.002 0	0.282 0	0.010 2	0.037 6	0.000 4	252	8.041 648	238	2.577 400	94
D0085TW1-07	19.18	135.0	429	0.31	0.052 0	0.002 4	0.276 0	0.009 9	0.038 5	0.000 5	247	7.865 193	243	2.910 820	98
D0085TW1-08	23.91	210.0	560	0.38	0.052 8	0.001 9	0.268 4	0.009 5	0.036 6	0.000 3	241	7.606 676	232	2.050 042	95
D0085TW1-09	25.53	173.0	597	0.29	0.050 4	0.001 9	0.263 3	0.009 6	0.037 8	0.000 3	237	7.741 053	239	2.153 142	99
D0085TW1-10	23.74	231.0	532	0.43	0.056 5	0.001 9	0.291 2	0.009 2	0.037 4	0.000 4	260	7.241 432	237	2.426 399	90
D0085TW1-12	28.16	317.0	645	0.49	0.051 5	0.001 8	0.260 8	0.008 9	0.036 5	0.000 3	235	7.177 285	231	2.151 122	98
D0085TW1-13	54.70	423.0	944	0.45	0.049 2	0.006 7	0.288 5	0.042 4	0.037 9	0.000 5	257	33.403 980	240	2.983 798	92
D0085TW1-14	43.50	489.0	893	0.55	0.048 9	0.001 7	0.253 9	0.008 3	0.037 6	0.000 3	230	6.711 322	238	2.144 931	96
D0085TW1-15	40.40	270.0	818	0.33	0.051 3	0.003 4	0.265 6	0.016 6	0.038 1	0.000 4	239	13.282 880	241	2.474 921	99
D0085TW1-16	17.66	153.0	406	0.38	0.056 4	0.002 6	0.284 1	0.010 9	0.036 5	0.000 3	254	8.628 553	231	2.139 124	90
D0085TW1-17	16.50	146.0	378	0.39	0.056 1	0.002 3	0.288 3	0.011 5	0.037 3	0.000 4	257	9.092 249	236	2.585 671	91
D0085TW1-18	20.42	166.0	468	0.35	0.050 1	0.001 9	0.262 5	0.009 6	0.038 1	0.000 4	237	7.726 323	241	2.341 736	98
D0085TW1-19	19.66	126.0	470	0.27	0.053 3	0.002 1	0.273 0	0.010 5	0.037 1	0.000 4	245	8.381 644	235	2.268 960	95
D0085TW1-20	18.46	150.0	425	0.35	0.056 8	0.002 2	0.297 7	0.012 0	0.038 1	0.000 5	265	9.386 168	241	3.115 617	90
D0085TW1-21	19.67	107.0	462	0.23	0.056 8	0.002 0	0.293 4	0.009 4	0.037 6	0.000 4	261	7.420 364	238	2.389 572	90
D0085TW1-22	12.02	97.3	281	0.35	0.056 2	0.002 3	0.284 7	0.011 4	0.036 8	0.000 5	254	9.010 816	233	2.986 493	91
D0085TW1-23	15.82	139.0	359	0.39	0.055 0	0.002 2	0.290 7	0.011 8	0.038 4	0.000 5	259	9.307 737	243	3.326 981	93
D0085TW1-24	24.30	283.0	547	0.52	0.052 3	0.002 0	0.267 7	0.009 8	0.037 2	0.000 4	241	7.825 648	235	2.380 378	97
D0085TW1-11	22.13	158.0	473	0.33	0.058 6	0.002 2	0.342 6	0.013 8	0.041 9	0.000 6	299	10.406 360	265	3.561 365	87
D0085TW1-04	40.50	207.0	626	0.33	0.070 6	0.006 5	0.366 1	0.036 5	0.035 6	0.000 5	317	27.124 370	225	3.114 964	66
PM101TW2-01	24.99	165.0	613	0.27	0.054 6	0.002 6	0.288 2	0.013 3	0.037 6	0.000 7	257	10.499 000	238	4.542 506	92
PM101TW2-02	5.84	59.2	133	0.44	0.054 7	0.003 3	0.280 0	0.015 3	0.036 9	0.000 7	251	12.150 970	233	4.144 204	92
PM101TW2-03	15.64	329.0	326	1.01	0.050 6	0.002 5	0.250 9	0.012 0	0.035 8	0.000 4	227	9.761 162	227	2.538 879	99
PM101TW2-04	32.20	508.0	748	0.68	0.055 7	0.002 0	0.290 4	0.012 2	0.037 9	0.000 7	259	9.573 867	240	4.317 905	92
PM101TW2-05	15.18	232.0	313	0.74	0.051 5	0.002 3	0.269 5	0.011 4	0.038 0	0.000 5	242	9.120 963	241	2.932 484	99
PM101TW2-06	8.72	111.0	190	0.59	0.053 2	0.003 3	0.271 4	0.015 9	0.037 2	0.000 5	244	12.692 780	235	3.087 314	96
PM101TW2-07	16.69	248.0	342	0.72	0.052 1	0.002 4	0.273 7	0.012 1	0.038 5	0.000 5	246	9.645 849	243	2.881 212	99
PM101TW2-08	31.22	105.0	778	0.13	0.050 7	0.001 7	0.257 4	0.008 2	0.036 7	0.000 3	233	6.587 073	232	2.142 391	99
PM101TW2-09	22.46	225.0	503	0.45	0.050 3	0.001 8	0.261 2	0.009 0	0.037 7	0.000 4	236	7.246 052	238	2.454 537	98
PM101TW2-10	47.22	218.0	1123	0.19	0.052 5	0.001 4	0.273 5	0.007 4	0.037 6	0.000 4	246	5.939 210	238	2.293 911	96
PM101TW2-11	23.15	121.0	558	0.22	0.049 1	0.001 8	0.259 5	0.009 1	0.038 4	0.000 5	234	7.350 808	243	2.949 178	96
PM101TW2-12	27.68	123.0	676	0.18	0.050 2	0.001 6	0.257 8	0.008 2	0.037 2	0.000 4	233	6.638 558	235	2.233 841	98
PM101TW2-13	8.81	84.6	195	0.43	0.052 2	0.003 0	0.273 6	0.014 7	0.038 3	0.000 5	246	11.713 420	242	3.087 143	98
PM101TW2-14	14.68	135.0	328	0.41	0.056 3	0.002 5	0.295 5	0.013 2	0.038 1	0.000 4	263	10.382 300	241	2.726 287	91
PM101TW2-15	7.23	121.0	163	0.74	0.055 6	0.003 3	0.269 4	0.012 8	0.035 6	0.000 7	242	10.206 910	226	4.322 975	92
PM101TW2-16	12.91	211.0	270	0.78	0.053 2	0.002 7	0.270 5	0.013 2	0.037 0	0.000 4	243	10.589 590	234	2.729 670	96
PM101TW2-17	20.74	56.5	508	0.11	0.051 1	0.002 0	0.268 6	0.010 4	0.038 0	0.000 4	242	8.332 940	241	2.785 187	99
PM101TW2-18	10.63	126.0	244	0.52	0.050 4	0.002 8	0.252 7	0.013 8	0.036 3	0.000 5	229	11.178 250	230	2.985 580	99
PM101TW2-19	11.68	31.7	300	0.11	0.047 2	0.002 5	0.237 9	0.012 5	0.036 3	0.000 4	217	10.280 860	230	2.665 503	94
测点号	元素含量/10^-6			Th/U	同位素比值						年龄/Ma				谐和度/%
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	谐和度/%
PM101TW2-20	35.73	213.0	874	0.24	0.052 3	0.001 8	0.267 1	0.009 0	0.036 7	0.000 4	240	7.221 691	233	2.299 552	96
PM101TW2-21	39.42	228.0	985	0.23	0.048 6	0.001 5	0.244 0	0.007 5	0.036 0	0.000 3	222	6.130 708	228	2.009 034	97
PM101TW2-22	36.55	427.0	837	0.51	0.051 6	0.001 5	0.261 4	0.007 4	0.036 3	0.000 3	236	5.947 337	230	1.959 542	97
PM101TW2-23	38.00	452.0	831	0.54	0.052 4	0.001 6	0.276 5	0.008 8	0.037 8	0.000 4	248	6.963 153	239	2.462 736	96
PM101TW2-24	9.31	124.0	205	0.60	0.053 6	0.003 0	0.272 3	0.014 7	0.036 6	0.000 5	245	11.750 520	232	3.051 353	94
PM101TW2-25	8.78	99.1	196	0.51	0.047 9	0.003 0	0.246 8	0.015 1	0.037 3	0.000 6	224	12.315 210	236	3.442 544	94

样品编号	岩性	SiO₂		TiO₂				Al₂O₃			TFe₂O₃			MnO			MgO			CaO			Na₂O		K₂O		P₂O₅	烧失量	总量
PM101YQ/WL/XT1	玄武质熔岩		50.351		0.578				13.653			6.844			0.121			7.784			5.739			1.918	0.758		0.080	11.696	99.522
PM101YQ/WL/XT2	安山质熔岩		60.471		0.602				15.206			4.273			0.105			1.522			4.550			2.845	2.594		0.159	7.497	99.824
D0085YQ/WL/XT1	安山质晶屑熔岩		64.390		0.532				16.164			4.764			0.051			2.352			3.416			3.633	2.395		0.105	1.884	99.686
样品编号	岩性	Rb		Ba				Th			U			Ta			Nb			Sr			Zr		Hf		K/Rb	Rb/Sr	Th/U
PM101YQ/WL/XT1	玄武质熔岩	43.52		174.21				4.68			1.21			0.41			5.50			293.59			117.11		3.07		104.41	1.31	3.87
PM101YQ/WL/XT2	安山质熔岩	121.38		571.03				14.73			3.29			1.35			20.66			370.37			218.77		5.84		128.12	1.37	4.48
D0085YQ/WL/XT1	安山质晶屑熔岩	114.65		517.33				11.50			2.36			0.94			13.29			345.24			176.21		4.64		125.24	1.87	4.87
样品编号	岩性	Sr/Ba		La				Ce			Pr			Nd			Sm			Eu			Gd		Tb		Dy	Ho	Er
PM101YQ/WL/XT1	玄武质熔岩	1.69		15.34				33.32			3.81			14.89			3.09			0.82			2.89		0.46		2.90	0.54	1.57
PM101YQ/WL/XT2	安山质熔岩	0.65		47.11				88.52			9.68			35.49			5.88			1.48			4.34		0.60		2.89	0.48	1.25
D0085YQ/WL/XT1	安山质晶屑熔岩	0.67		31.42				61.24			6.52			23.95			4.74			1.07			3.66		0.51		2.76	0.49	1.34
样品编号	岩性		Tm			Yb	Lu			Y			REE			LREE			HREE			LREE/HREE				(La/Yb)_N		δEu	δCe
PM101YQ/WL/XT1	玄武质熔岩		0.25			1.65	0.23			15.71			81.75			71.25			10.50			6.79				6.68		0.82	1.04
PM101YQ/WL/XT2	安山质熔岩		0.19			1.06	0.16			13.51			199.14			188.17			10.97			17.15				31.75		0.86	0.96
D0085YQ/WL/XT1	安山质晶屑熔岩		0.20			1.22	0.18			13.97			139.30			128.93			10.37			12.43				18.40		0.76	0.99

样品编号	岩性	SiO₂		TiO₂				Al₂O₃			TFe₂O₃			MnO			MgO			CaO			Na₂O		K₂O		P₂O₅	烧失量	总量
PM101YQ/WL/XT1	玄武质熔岩		50.351		0.578				13.653			6.844			0.121			7.784			5.739			1.918	0.758		0.080	11.696	99.522
PM101YQ/WL/XT2	安山质熔岩		60.471		0.602				15.206			4.273			0.105			1.522			4.550			2.845	2.594		0.159	7.497	99.824
D0085YQ/WL/XT1	安山质晶屑熔岩		64.390		0.532				16.164			4.764			0.051			2.352			3.416			3.633	2.395		0.105	1.884	99.686
样品编号	岩性	Rb		Ba				Th			U			Ta			Nb			Sr			Zr		Hf		K/Rb	Rb/Sr	Th/U
PM101YQ/WL/XT1	玄武质熔岩	43.52		174.21				4.68			1.21			0.41			5.50			293.59			117.11		3.07		104.41	1.31	3.87
PM101YQ/WL/XT2	安山质熔岩	121.38		571.03				14.73			3.29			1.35			20.66			370.37			218.77		5.84		128.12	1.37	4.48
D0085YQ/WL/XT1	安山质晶屑熔岩	114.65		517.33				11.50			2.36			0.94			13.29			345.24			176.21		4.64		125.24	1.87	4.87
样品编号	岩性	Sr/Ba		La				Ce			Pr			Nd			Sm			Eu			Gd		Tb		Dy	Ho	Er
PM101YQ/WL/XT1	玄武质熔岩	1.69		15.34				33.32			3.81			14.89			3.09			0.82			2.89		0.46		2.90	0.54	1.57
PM101YQ/WL/XT2	安山质熔岩	0.65		47.11				88.52			9.68			35.49			5.88			1.48			4.34		0.60		2.89	0.48	1.25
D0085YQ/WL/XT1	安山质晶屑熔岩	0.67		31.42				61.24			6.52			23.95			4.74			1.07			3.66		0.51		2.76	0.49	1.34
样品编号	岩性		Tm			Yb	Lu			Y			REE			LREE			HREE			LREE/HREE				(La/Yb)_N		δEu	δCe
PM101YQ/WL/XT1	玄武质熔岩		0.25			1.65	0.23			15.71			81.75			71.25			10.50			6.79				6.68		0.82	1.04
PM101YQ/WL/XT2	安山质熔岩		0.19			1.06	0.16			13.51			199.14			188.17			10.97			17.15				31.75		0.86	0.96
D0085YQ/WL/XT1	安山质晶屑熔岩		0.20			1.22	0.18			13.97			139.30			128.93			10.37			12.43				18.40		0.76	0.99