Characteristics of Silicon-rich Melt Inclusions in the Cenozoic Basalts from Hainan Island and Their Genesis

doi:10.19657/j.geoscience.1000-8527.2024.024

Abstract

Abstract:

Melt inclusions record important information such as the evolution of pre-eruption, degassing process, and volatile budget in magma. Melt inclusions are powerful tools for studying basaltic magma systems and mantle source, and are widely used to study the origin and evolution of magma derived mantle. There are a large number of melt and fluid inclusions in the olivine phenocryst of the Cenozoic basalts in the Penglai area of Hainan Island. Using an electron microprobe to analyze the composition of melt inclusions and their host minerals. The host mineral olivines have Fo values ranging from 70 to 85, with CaO values exceeding 0.1%, which is typical phenocrysts rather than mantle xenocrysts. At room temperature conditions, the melt inclusions are composed of melt (glass), bubbles and sub-minerals (pyroxene, plagioclase and Ilmenite). The glass compositions in melt inclusions are dacite and trachyte. Olivines containing melt inclusions were heated in a high-temperature furnace. After homogenization melt inclusions, no sub-minerals were observed in the melt. The glass compositions of the melt inclusions are basalt and basaltic andesite, and a few are andesite. The compositions of homogenization melt inclusions are similar to those of the bulk Cenozoic basalts in the Penglai area, Hainan Island. This study suggests that the presence of Si-rich melt inclusions in the phenocrysts of the Cenozoic basaltic rocks in the Penglai area of Hainan Island are due to the slow cooling rate after the melt inclusions are trapped. The slow cooling rate in melt made fraction crystallization in the melt inclusions, leading to the continuous evolution of the residual liquids towards Si-rich direction. Therefore, before conducting research on melt inclusions, it is necessary to carefully observe the internal structural characteristics of the melt inclusions, and if necessary, conduct heating experiments.

Key words: Hainan Island, Cenozoic basalt, olivine, phenocryst, Si-rich melt inclusion, genesis

CLC Number:

P588.12

XU Xin, ZHANG Lifei, TIAN Wei, ZHU Jintao, HE Yanxin. Characteristics of Silicon-rich Melt Inclusions in the Cenozoic Basalts from Hainan Island and Their Genesis[J]. Geoscience, 2025, 39(01): 31-45.

Figures/Tables 12

References 43

[1]	ROEDDER E. Origin and significance of magmatic inclusions[J]. Bulletin de Mineralogie, 1979, 102: 487-510.
[2]	ROEDDER E. Fluid Inclusions[M]. Berlin, Boston: De Gruyter, 1984.
[3]	LOWENSTERN J B. Applications of silicate-melt inclusions to the study of magmatic volatiles[J]. Magmas Fluids Ore Deposit, 1995, 23: 71-99.
[4]	ANDERSON A T, DAVIS A M, LU F Q. Evolution of Bishop Tuff rhyolitic magma based on melt and magnetite inclusions and zoned phenocrysts[J]. Journal of Petrology, 2000, 41: 449-473.
[5]	HAURI E. SIMS analysis of volatiles in silicate glasses, 2: isotopes and abundances in Hawaiian melt inclusions[J]. Chemical Geology, 2002, 183: 115-141.
[6]	LOWENSTERN J B. Melt Inclusions Come of Age: Volatiles, Volcanoes, and Sorby’s Legacy[J]. Developments in Volcanology, 2003, 5:1-21.
[7]	WALLACE P J. Volatiles in subduction zone magmas: concentrations and fluxes based on melt inclusion and volcanic gas data[J]. Journal of Volcanology and Geothermal Research, 2005, 140: 217-240.
[8]	BODNAR R J, STUDENT J J. Melt Inclusions in Plutonic Rocks: Petrography and Micro Thermometry[M]//WEBSTER J D. Melt Inclusions in Plutonic Rocks. Mineralogical Association of Canada, Short Course, 2006, 36: 1-26.
[9]	GAZEL E, PLANK T, FORSYTH D W, et al. Lithosphere versus asthenosphere mantle sources at the Big Pine Volcanic Field, California[J]. Geochemistry Geophysics Geosystems, 2012, 13: 1-25.
[10]	王蝶, 卢焕章, 单强. 岩浆熔体包裹体研究进展[J]. 岩石学报, 2017, 33(2): 653-666.
[11]	张道涵, 魏俊浩, 付乐兵. 熔体包裹体的形成、改造和分析方法及其矿床学应用[J]. 地球科学:中国地质大学学报, 2017, 42(6) : 990-1007.
[12]	李霓, 孙嘉祥. 火山岩中熔体包裹体研究进展[J]. 矿物岩石地球化学通报, 2018, 37(3): 414-423.
[13]	任钟元, 张乐, 吴亚东, 等. 熔体包裹体在镁铁质火山岩成因研究中的应用[J]. 矿物岩石地球化学通报, 2018, 37(3): 395-413.
[14]	丁一, 刘吉强, 李正刚. 橄榄石及其熔体包裹体地球化学约束冲绳海槽岩浆水含量[J]. 大地构造与成矿学, 2020, 44(6):1208-1207.
[15]	WANG X C, LI Z, LI X, et al. Identification of an ancient mantle reservoir and young recycled materials in the source region of a young mantle plume: implications for potential linkages between plume and plate tectonics[J]. Earth Planet Science Letter, 2013, 377: 248-259.
[16]	温淑女. 海南岛二叠纪—三叠纪岩浆作用的年代学与地球化学研究[D]. 北京: 中国科学院大学, 2013.
[17]	ZOU H B, FAN Q C. U-Th isotopes in Hainan basalts: Implications for sub-asthenospheric origin of EM2 mantle endmember and the dynamics of melting beneath Hainan Island[J]. Lithos, 2010, 116: 145-152.
[18]	龙文国, 符策锐, 朱耀. 海南岛东部黄竹岭地区“抱板群”的解体[J]. 地层学杂志, 2002, 26(3): 212-215.
[19]	广东省地质矿产局. 海南岛区域地质调查报告(1∶200000). 1964.
[20]	李薇, 贾丽云, 胡道功, 等. 琼北老城剖面记录的马袅—铺前断裂西段晚更新世活动历史[J]. 现代地质, 2019, 33(5): 970-978.
[21]	袁晓博, 方念乔, 董海龙. 海南岛高峰、保城地区花岗岩年代学、地球化学特征及构造意义[J]. 现代地质, 2019, 33(01): 85-97. DOI
[22]	舒斌, 王平安, 李中坚, 等. 海南抱伦金矿的成矿时代研究及其意义[J]. 现代地质, 2004, 18(3): 316-320.
[23]	孙谦. 琼北第四纪火山活动与岩浆演化[D]. 北京: 中国地震局地质研究所, 2003.
[24]	樊祺诚, 孙谦, 李霓, 等. 琼北火山活动分期与全新世岩浆演化[J]. 岩石学报, 2004, 20(3): 533-544.
[25]	NIELSEN R L, MICHAEL P J, SOURS P R. Chemical and physical indicators of compromised melt inclusions[J]. Geochimica et Cosmochimica Acta, 1988, 62(5): 831-839.
[26]	REN Z Y, HANYU T, MIYAZAKI T, et al. Geochemical differences of the Hawaiian shield lavas: Implications for melting process in the heterogeneous Hawaiian plume[J]. Journal of Petrology, 2009, 50(8): 1553-1573.
[27]	SOBOLEV A V, HOFMANN A W, KUZMIN D V, et al. The amount of recycled crust in sources of mantle-derived melts[J]. Science, 2007, 316: 412-417. DOI PMID
[28]	WANG Z, GAETANI G A. Partitioning of Ni between olivine and siliceous eclogite partial melt: experimental constraints on the mantle source of Hawaiian basalts[J]. Contributions to Mineralogy and Petrology, 2008, 156(5), 661-678.
[29]	XU X, TIAN W, ZHANG L F, et al. Carbon Enrichment in the Lithospheric Mantle: Evidence from the Melt Inclusions in Mantle Xenoliths from the Hainan Basalts[J]. Acta Geologica Sinica-English Edition, 2023, 97: 358-375.
[30]	LE BAS M J, LE MAITRE R W, STRECKEISEN A, et al. A Chemical Classification of Volcanic Rocks Based on the Total Alkali-Silica Diagram[J]. Journal of Petrology, 1986, 27: 745-750.
[31]	LIU J Q, REN Z Y, NICHOLS A R L, et al. Petrogenesis of Late Cenozoic basalts from North Hainan Island: Constraints from melt inclusions and their host olivines[J]. Geochimica et Cosmochimica Acta, 2015, 152: 89-121.
[32]	WANG P Y, GU X Y, KURITANI T, et al. Highly variable H₂O/Ce ratios in the Hainan mantle plume[J]. Lithos, 2021, 406-407.
[33]	KENT A J R. Melt Inclusions in Basaltic and Related Volcanic Rocks[M]. Reviews in Mineralogy and Geochemistry, 2008, 69(1): 273-331.
[34]	DANYUSHEVSKY L V, DELLA-PASQUA F N, SOKOLOV S. Re-equilibration of melt inclusions trapped by magnesian olivine phenocrysts from subduction-related magmas: petrological implications[J]. Contributions to Mineralogy and Petrology, 2000, 138(1): 68-83.
[35]	DANYUSHEVSKY L V, PLECHOV P. Petrolog3: Integrated software for modeling crystallization processes[J]. Geocchemistry, Geophysics, Geosystems, 2011, 12(7): 1-32.
[36]	QIAN S P, REN Z Y, RICHARD W, et al. Petrogenesis of early cretaceous basaltic lavas from the north China craton: implications for cratonic destruction[J]. Journal of Geophysical Research Solid Earth, 2017, 122: 1900-1918.
[37]	FORD C E, RUSSEL D G, CRAVEN J A, et al. Olivine-liquid equilibria: temperature, pressure and composition dependence of the crystal/liquid cation partition coeffcients for Mg, Fe²⁺, Ca and Mn[J]. Journal of Petrology, 1983, 24: 256-265.
[38]	刘建强, 任钟元. 玄武岩源区母岩的多样性和识别特征:以海南岛玄武岩为例[J]. 大地构造与成矿, 2015, 37(3): 471-488.
[39]	SCHIANO P, CLOCCHIATTI R. Worldwide occurrence of silica rich melts in sub-continental and sub-oceanic mantle minerals[J]. Nature, 1994, 368: 621-624.
[40]	PUTIRKA K D. Thermometers and Barometers for Volcanic Systems[J]. Reviews Mineralogy Geochemistry, 2008, 69: 61-120.
[41]	杜星星, 樊祺诚. 汉诺坝地幔捕虏体中富硅熔体的成因及其意义[J]. 岩石学报, 2011, 27(5): 1267-1274.
[42]	刘勇, 杨庆坤, 郭福生, 等. 赣南大洲塘中生代高镁安山岩地球化学特征及年代学意义[J]. 东华理工大学学报(自然科学版), 2023, 46(1): 48-60.
[43]	ROSE-KOGA E F, BOUVIER A S, GAETANI G A, et al. Silicate melt inclusions in the new millennium: A review of recommended practices for preparation, analysis, and data presentation[J]. Chemical Geology, 2021, 570: 1-26.

样品号	SiO₂	FeO	MnO	MgO	CaO	NiO	Al₂O₃	P₂O₅	TiO₂	Cr₂O₃	总量	Fo
PL28-5a	36.54	27.33	0.33	35.89	0.23	0.14	0.02	-	-	-	100.49	70
PL28-8a	37.17	25.89	0.17	37.24	0.21	0.20	-	0.03	0.12	-	101.03	72
PL28-9	36.67	27.76	0.20	35.88	0.20	0.13	0.01	0.01	0.01	0.01	100.90	70
PL28-13	37.35	22.29	0.18	39.55	0.18	0.27	0.03	-	-	-	99.84	76
PL28-13a	37.66	20.96	0.26	40.54	0.14	0.24	0.01	-	0.06	-	99.89	78
PL28-27	38.18	19.81	0.21	41.15	0.09	0.21	0.02	0.03	-	0.01	99.70	79
PL28-35	37.44	21.27	0.23	40.19	0.15	0.23	0.02	-	-	0.01	99.55	77
PLTW-7	37.36	25.02	0.23	37.11	0.22	0.15	0.04	0.01	-	-	100.14	73
PLTW-14	37.55	24.07	0.29	38.22	0.15	0.20	0.01	-	-	0.03	100.53	74
PLTW-23	36.62	25.21	0.32	37.43	0.22	0.16	0.01	-	-	-	99.97	73
PL13-1	37.15	25.66	0.24	36.87	0.22	0.16	0.03	-	-	0.05	100.37	72
PL13-1a	37.01	25.58	0.21	36.79	0.26	0.18	0.03	0.06	0.01	0.05	100.20	72
PL13-25	37.04	25.87	0.23	36.58	0.23	0.15	0.03	0.06	0.07	-	100.26	72
PL13-12	36.77	26.39	0.18	36.53	0.25	0.14	0.01	0.05	-	0.01	100.34	71
PL13-12a	36.67	26.40	0.18	36.54	0.25	0.17	0.01	0.02	-	-	100.24	71
PL13-36	37.28	24.13	0.23	38.04	0.18	0.19	0.01	0.07	-	0.02	100.15	74
PL13-36a	37.24	24.76	0.23	37.57	0.19	0.21	0.01	0.04	-	-	100.28	73
PL39-12	37.41	23.98	0.24	38.10	0.21	0.17	0.01	0.05	-	-	100.16	74
PL39-21	37.56	23.53	0.26	38.04	0.15	0.17	-	-	-	0.02	99.75	74
PL25-5	37.33	25.30	0.20	37.36	0.17	0.24	0.01	0.03	-	0.02	100.68	73
PL25-17	36.93	26.46	0.33	36.06	0.22	0.20	0.01	-	0.02	0.02	100.26	71
PL25-28	37.22	24.32	0.25	37.82	0.15	0.18	0.02	0.01	-	0.01	99.99	74
PL35-1	37.23	21.92	0.22	39.32	0.08	0.22	0.01	0.05	-	-	99.06	76
PL35-8	37.17	25.43	0.28	37.23	0.23	0.22	0.01	-	-	0.01	100.58	72
PL35-11	37.89	21.92	0.20	39.67	0.12	0.18	-	0.01	-	-	99.99	76
PL35-12	37.44	25.06	0.26	36.89	0.21	0.16	0.03	0.05	0.07	0.02	100.19	72
PL35-28	37.16	25.02	0.24	37.70	0.21	0.17	0.01	0.05	-	-	100.56	73
PL26-16	37.24	24.74	0.20	37.45	0.16	0.19	0.01	0.01	-	0.03	100.03	73
PL26-17	37.09	25.34	0.29	37.65	0.20	0.13	-	-	-	0.02	100.74	73
PLTW-2^*	37.51	23.01	0.30	39.07	0.15	0.20	-	-	0.01	0.02	100.28	75
PLTW-9^*	37.37	24.57	0.21	38.08	0.16	0.26	0.04	-	0.02	-	100.72	73
PLTW-22^*	37.32	24.20	0.18	38.55	0.10	0.24	0.02	-	0.07	0.03	100.71	74
PLTW-28^*	36.98	25.21	0.24	37.59	0.15	0.17	0.02	-	-	0.02	100.40	73
PLTW-32^*	37.29	25.28	0.27	37.61	0.18	0.22	-	-	-	-	100.84	73
PLTW-33^*	37.67	24.38	0.21	38.35	0.14	0.24	0.01	0.04	0.05	0.03	101.12	74
PL28-9^*	36.67	27.07	0.26	35.50	0.20	0.17	-	0.05	0.03	-	99.96	70
PL28-12^*	38.86	15.13	0.10	44.65	0.07	0.25	0.03	-	-	-	99.11	84
PL28-14^*	37.15	25.46	0.20	37.45	0.20	0.17	0.01	-	0.01	0.01	100.65	72
PL28-20^*	37.47	25.10	0.31	37.89	0.18	0.22	0.02	-	0.03	-	101.24	73
PL28-27^*	37.55	23.12	0.21	39.03	0.12	0.19	-	0.02	0.03	-	100.29	75
PL35-13^*	38.01	20.35	0.20	40.92	0.15	0.29	0.01	-	-	0.01	99.95	78
PL39-12^*	37.07	25.92	0.30	36.90	0.22	0.16	0.01	0.05	0.10	-	100.73	72
PL39-29^*	36.94	26.58	0.37	36.08	0.26	0.15	0.03	0.03	-	0.02	100.47	71
PL39-30^*	36.82	25.75	0.24	36.75	0.23	0.20	0.02	-	-	-	100.02	72
PL12-4^*	37.45	24.35	0.19	38.17	0.14	0.21	-	0.02	0.02	-	100.56	74
PL12-7^*	37.51	24.99	0.25	37.54	0.24	0.20	-	-	0.11	0.02	100.85	73
PL12-9^*	37.32	24.96	0.24	37.57	0.23	0.27	0.02	0.04	0.02	0.02	100.71	73
PL12-12^*	37.03	24.93	0.27	37.39	0.25	0.23	0.01	-	-	0.01	100.12	73
PL12-15^*	37.41	24.97	0.33	37.74	0.22	0.22	-	0.01	0.07	-	101.00	73
PL12-25^*	37.07	25.18	0.33	37.89	0.22	0.23	0.02	0.02	-	0.01	101.00	73
PL12-30^*	37.47	25.09	0.25	37.39	0.19	0.16	0.01	-	-	-	100.59	73
PL26-9^*	38.04	21.73	0.20	40.19	0.16	0.24	-	-	-	-	100.57	77
PL26-21^*	39.28	14.37	0.14	45.18	0.04	0.31	0.02	-	0.10	0.01	99.46	85
PL13-2^*	37.10	25.69	0.29	37.14	0.23	0.17	-	-	-	0.01	100.66	72
PL13-4^*	37.31	25.30	0.27	37.64	0.20	0.14	-	0.05	0.02	0.01	100.97	73
PL13-9^*	37.20	25.32	0.25	37.38	0.20	0.24	-	0.03	0.01	0.01	100.66	73
PL13-9a^*	37.21	25.21	0.23	37.79	0.14	0.26	0.02	-	0.03	-	100.91	73
PL13-15^*	38.34	18.64	0.17	42.77	0.15	0.31	0.04	0.05	0.10	0.03	100.62	80
PL13-27^*	37.65	20.94	0.13	40.93	0.09	0.35	0.01	-	-	-	100.11	78
PL13-29^*	37.97	19.62	0.17	41.50	0.11	0.25	-	0.07	0.01	0.02	99.74	79
PL13-34^*	37.57	23.20	0.20	38.91	0.13	0.16	-	-	0.06	-	100.27	75

样品号	SiO₂	FeO	MnO	MgO	CaO	NiO	Al₂O₃	P₂O₅	TiO₂	Cr₂O₃	总量	Fo
PL28-5a	36.54	27.33	0.33	35.89	0.23	0.14	0.02	-	-	-	100.49	70
PL28-8a	37.17	25.89	0.17	37.24	0.21	0.20	-	0.03	0.12	-	101.03	72
PL28-9	36.67	27.76	0.20	35.88	0.20	0.13	0.01	0.01	0.01	0.01	100.90	70
PL28-13	37.35	22.29	0.18	39.55	0.18	0.27	0.03	-	-	-	99.84	76
PL28-13a	37.66	20.96	0.26	40.54	0.14	0.24	0.01	-	0.06	-	99.89	78
PL28-27	38.18	19.81	0.21	41.15	0.09	0.21	0.02	0.03	-	0.01	99.70	79
PL28-35	37.44	21.27	0.23	40.19	0.15	0.23	0.02	-	-	0.01	99.55	77
PLTW-7	37.36	25.02	0.23	37.11	0.22	0.15	0.04	0.01	-	-	100.14	73
PLTW-14	37.55	24.07	0.29	38.22	0.15	0.20	0.01	-	-	0.03	100.53	74
PLTW-23	36.62	25.21	0.32	37.43	0.22	0.16	0.01	-	-	-	99.97	73
PL13-1	37.15	25.66	0.24	36.87	0.22	0.16	0.03	-	-	0.05	100.37	72
PL13-1a	37.01	25.58	0.21	36.79	0.26	0.18	0.03	0.06	0.01	0.05	100.20	72
PL13-25	37.04	25.87	0.23	36.58	0.23	0.15	0.03	0.06	0.07	-	100.26	72
PL13-12	36.77	26.39	0.18	36.53	0.25	0.14	0.01	0.05	-	0.01	100.34	71
PL13-12a	36.67	26.40	0.18	36.54	0.25	0.17	0.01	0.02	-	-	100.24	71
PL13-36	37.28	24.13	0.23	38.04	0.18	0.19	0.01	0.07	-	0.02	100.15	74
PL13-36a	37.24	24.76	0.23	37.57	0.19	0.21	0.01	0.04	-	-	100.28	73
PL39-12	37.41	23.98	0.24	38.10	0.21	0.17	0.01	0.05	-	-	100.16	74
PL39-21	37.56	23.53	0.26	38.04	0.15	0.17	-	-	-	0.02	99.75	74
PL25-5	37.33	25.30	0.20	37.36	0.17	0.24	0.01	0.03	-	0.02	100.68	73
PL25-17	36.93	26.46	0.33	36.06	0.22	0.20	0.01	-	0.02	0.02	100.26	71
PL25-28	37.22	24.32	0.25	37.82	0.15	0.18	0.02	0.01	-	0.01	99.99	74
PL35-1	37.23	21.92	0.22	39.32	0.08	0.22	0.01	0.05	-	-	99.06	76
PL35-8	37.17	25.43	0.28	37.23	0.23	0.22	0.01	-	-	0.01	100.58	72
PL35-11	37.89	21.92	0.20	39.67	0.12	0.18	-	0.01	-	-	99.99	76
PL35-12	37.44	25.06	0.26	36.89	0.21	0.16	0.03	0.05	0.07	0.02	100.19	72
PL35-28	37.16	25.02	0.24	37.70	0.21	0.17	0.01	0.05	-	-	100.56	73
PL26-16	37.24	24.74	0.20	37.45	0.16	0.19	0.01	0.01	-	0.03	100.03	73
PL26-17	37.09	25.34	0.29	37.65	0.20	0.13	-	-	-	0.02	100.74	73
PLTW-2^*	37.51	23.01	0.30	39.07	0.15	0.20	-	-	0.01	0.02	100.28	75
PLTW-9^*	37.37	24.57	0.21	38.08	0.16	0.26	0.04	-	0.02	-	100.72	73
PLTW-22^*	37.32	24.20	0.18	38.55	0.10	0.24	0.02	-	0.07	0.03	100.71	74
PLTW-28^*	36.98	25.21	0.24	37.59	0.15	0.17	0.02	-	-	0.02	100.40	73
PLTW-32^*	37.29	25.28	0.27	37.61	0.18	0.22	-	-	-	-	100.84	73
PLTW-33^*	37.67	24.38	0.21	38.35	0.14	0.24	0.01	0.04	0.05	0.03	101.12	74
PL28-9^*	36.67	27.07	0.26	35.50	0.20	0.17	-	0.05	0.03	-	99.96	70
PL28-12^*	38.86	15.13	0.10	44.65	0.07	0.25	0.03	-	-	-	99.11	84
PL28-14^*	37.15	25.46	0.20	37.45	0.20	0.17	0.01	-	0.01	0.01	100.65	72
PL28-20^*	37.47	25.10	0.31	37.89	0.18	0.22	0.02	-	0.03	-	101.24	73
PL28-27^*	37.55	23.12	0.21	39.03	0.12	0.19	-	0.02	0.03	-	100.29	75
PL35-13^*	38.01	20.35	0.20	40.92	0.15	0.29	0.01	-	-	0.01	99.95	78
PL39-12^*	37.07	25.92	0.30	36.90	0.22	0.16	0.01	0.05	0.10	-	100.73	72
PL39-29^*	36.94	26.58	0.37	36.08	0.26	0.15	0.03	0.03	-	0.02	100.47	71
PL39-30^*	36.82	25.75	0.24	36.75	0.23	0.20	0.02	-	-	-	100.02	72
PL12-4^*	37.45	24.35	0.19	38.17	0.14	0.21	-	0.02	0.02	-	100.56	74
PL12-7^*	37.51	24.99	0.25	37.54	0.24	0.20	-	-	0.11	0.02	100.85	73
PL12-9^*	37.32	24.96	0.24	37.57	0.23	0.27	0.02	0.04	0.02	0.02	100.71	73
PL12-12^*	37.03	24.93	0.27	37.39	0.25	0.23	0.01	-	-	0.01	100.12	73
PL12-15^*	37.41	24.97	0.33	37.74	0.22	0.22	-	0.01	0.07	-	101.00	73
PL12-25^*	37.07	25.18	0.33	37.89	0.22	0.23	0.02	0.02	-	0.01	101.00	73
PL12-30^*	37.47	25.09	0.25	37.39	0.19	0.16	0.01	-	-	-	100.59	73
PL26-9^*	38.04	21.73	0.20	40.19	0.16	0.24	-	-	-	-	100.57	77
PL26-21^*	39.28	14.37	0.14	45.18	0.04	0.31	0.02	-	0.10	0.01	99.46	85
PL13-2^*	37.10	25.69	0.29	37.14	0.23	0.17	-	-	-	0.01	100.66	72
PL13-4^*	37.31	25.30	0.27	37.64	0.20	0.14	-	0.05	0.02	0.01	100.97	73
PL13-9^*	37.20	25.32	0.25	37.38	0.20	0.24	-	0.03	0.01	0.01	100.66	73
PL13-9a^*	37.21	25.21	0.23	37.79	0.14	0.26	0.02	-	0.03	-	100.91	73
PL13-15^*	38.34	18.64	0.17	42.77	0.15	0.31	0.04	0.05	0.10	0.03	100.62	80
PL13-27^*	37.65	20.94	0.13	40.93	0.09	0.35	0.01	-	-	-	100.11	78
PL13-29^*	37.97	19.62	0.17	41.50	0.11	0.25	-	0.07	0.01	0.02	99.74	79
PL13-34^*	37.57	23.20	0.20	38.91	0.13	0.16	-	-	0.06	-	100.27	75

样品号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	SO₃	F	Cl	总量	寄主橄榄石Fo
PLTW-2	69.87	0.49	17.89	1.18	-	0.14	2.15	2.72	3.60	0.20	0.03	0.25	0.09	98.48	75
PLTW-9	71.20	0.74	17.02	1.35	0.02	0.20	2.55	2.08	2.20	0.10	0.01	-	0.08	97.53	73
PLTW-22	70.91	0.44	16.75	1.10	0.03	0.10	2.35	1.81	2.20	0.41	0.01	-	0.08	96.16	74
PLTW-22a	70.99	0.44	17.29	1.08	0.06	0.13	2.80	2.01	1.99	0.13	-	0.31	0.10	97.17	74
PLTW-28	69.02	0.81	18.01	1.22	0.05	0.10	2.85	2.48	2.88	0.17	0.03	0.10	0.06	97.72	73
PLTW-32	67.88	1.55	18.70	1.15	0.02	0.08	4.27	2.49	2.42	0.26	-	-	0.06	98.87	73
PLTW-33	64.73	0.95	17.70	1.83	0.09	0.33	7.06	2.60	2.16	0.07	0.17	-	0.12	97.78	74
PL28-9	65.78	0.91	17.07	2.29	-	0.35	5.43	3.11	2.79	0.53	0.06	0.41	0.04	98.58	70
PL28-12	66.68	1.39	18.39	1.41	0.02	0.25	3.08	2.74	2.99	1.24	-	0.05	0.07	98.25	84
PL28-14	68.02	1.04	17.03	1.92	0.02	0.24	3.65	2.36	2.98	0.39	0.03	-	0.10	97.76	72
PL28-20	65.02	1.74	17.10	2.60	0.11	0.44	5.94	2.55	2.46	0.72	0.10	-	0.12	98.87	73
PL28-27	70.74	1.18	16.23	1.52	0.05	0.13	2.39	1.07	1.53	0.51	-	0.15	0.04	95.47	75
PL28-27a	70.31	1.07	16.57	1.59	-	0.22	3.41	1.59	1.54	0.65	0.04	0.26	0.06	97.19	75
PL35-13	65.06	1.16	17.87	2.00	-	0.44	5.50	2.46	2.59	1.35	0.01	0.41	0.07	98.72	78
PL35-13a	68.02	0.60	18.26	1.55	0.12	0.24	3.62	2.24	2.34	0.54	-	-	0.06	97.57	78
PL39-12	64.69	0.23	19.84	1.44	-	0.13	0.87	2.34	7.38	0.08	0.01	-	0.09	97.08	72
PL39-12a	62.54	0.95	20.46	1.46	0.09	0.07	1.21	2.74	6.25	0.09	0.01	0.20	0.40	96.29	72
PL39-29	69.06	0.58	18.71	0.97	0.02	-	2.98	2.37	2.22	0.02	0.05	0.15	0.11	97.14	71
PL39-29a	66.58	0.97	17.79	1.87	0.01	0.26	6.30	2.68	1.82	0.02	0.08	0.10	0.11	98.51	71
PL12-4	70.34	0.88	18.35	1.21	-	0.09	2.19	2.82	3.07	0.24	0.04	0.15	0.05	99.35	74
PL12-7	61.63	0.23	16.81	1.03	-	0.11	7.59	1.95	2.54	4.94	0.02	1.08	0.17	97.60	73
PL12-9	68.88	0.67	18.56	1.12	-	0.02	2.62	2.65	3.20	0.09	-	-	0.08	97.87	73
PL12-12	69.25	0.81	18.51	1.22	-	0.01	3.64	1.88	1.77	0.88	0.06	-	0.10	98.11	73
PL12-15	69.42	0.16	18.96	1.19	0.01	0.15	1.06	2.75	2.90	0.59	0.01	0.10	0.09	97.32	73
PL12-25	68.27	0.46	19.23	1.38	0.08	0.28	3.37	2.07	2.62	0.50	-	-	0.12	98.34	73
PL12-30	67.09	0.51	20.67	1.36	0.03	0.08	0.98	2.73	4.55	0.31	-	0.05	0.14	98.44	73
PL26-9	66.93	3.51	17.18	2.16	0.06	0.19	2.25	1.76	2.62	0.83	-	-	0.08	97.56	77
PL26-21	68.63	1.95	18.48	1.45	0.08	0.29	1.48	1.60	2.75	1.24	-	-	0.16	98.07	85
PL13-2	62.47	0.82	17.74	1.40	-	0.17	7.53	2.42	2.65	2.35	0.06	0.41	0.40	98.15	72
PL13-4	68.18	0.51	18.64	1.78	-	0.24	4.61	2.68	2.73	0.17	-	-	0.08	99.60	73
PL13-9	62.39	0.91	16.98	1.96	-	0.43	9.24	2.52	2.20	4.20	-	0.83	0.11	101.39	73
PL13-15	68.86	0.51	17.91	1.05	0.02	0.21	3.79	2.70	2.97	-	0.03	0.31	0.05	98.26	80
PL13-27	68.25	1.07	19.20	0.91	-	0.01	3.56	2.77	2.70	0.25	0.01	0.15	0.16	98.95	78
PL13-29	70.37	0.46	18.45	0.88	-	0.11	1.01	1.92	3.09	0.59	0.05	0.05	0.11	97.05	79
PL13-34	69.36	0.63	18.56	1.20	-	0.16	2.43	2.71	3.31	0.17	0.02	-	0.08	98.60	75

样品号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	SO₃	F	Cl	总量	寄主橄榄石Fo
PLTW-2	69.87	0.49	17.89	1.18	-	0.14	2.15	2.72	3.60	0.20	0.03	0.25	0.09	98.48	75
PLTW-9	71.20	0.74	17.02	1.35	0.02	0.20	2.55	2.08	2.20	0.10	0.01	-	0.08	97.53	73
PLTW-22	70.91	0.44	16.75	1.10	0.03	0.10	2.35	1.81	2.20	0.41	0.01	-	0.08	96.16	74
PLTW-22a	70.99	0.44	17.29	1.08	0.06	0.13	2.80	2.01	1.99	0.13	-	0.31	0.10	97.17	74
PLTW-28	69.02	0.81	18.01	1.22	0.05	0.10	2.85	2.48	2.88	0.17	0.03	0.10	0.06	97.72	73
PLTW-32	67.88	1.55	18.70	1.15	0.02	0.08	4.27	2.49	2.42	0.26	-	-	0.06	98.87	73
PLTW-33	64.73	0.95	17.70	1.83	0.09	0.33	7.06	2.60	2.16	0.07	0.17	-	0.12	97.78	74
PL28-9	65.78	0.91	17.07	2.29	-	0.35	5.43	3.11	2.79	0.53	0.06	0.41	0.04	98.58	70
PL28-12	66.68	1.39	18.39	1.41	0.02	0.25	3.08	2.74	2.99	1.24	-	0.05	0.07	98.25	84
PL28-14	68.02	1.04	17.03	1.92	0.02	0.24	3.65	2.36	2.98	0.39	0.03	-	0.10	97.76	72
PL28-20	65.02	1.74	17.10	2.60	0.11	0.44	5.94	2.55	2.46	0.72	0.10	-	0.12	98.87	73
PL28-27	70.74	1.18	16.23	1.52	0.05	0.13	2.39	1.07	1.53	0.51	-	0.15	0.04	95.47	75
PL28-27a	70.31	1.07	16.57	1.59	-	0.22	3.41	1.59	1.54	0.65	0.04	0.26	0.06	97.19	75
PL35-13	65.06	1.16	17.87	2.00	-	0.44	5.50	2.46	2.59	1.35	0.01	0.41	0.07	98.72	78
PL35-13a	68.02	0.60	18.26	1.55	0.12	0.24	3.62	2.24	2.34	0.54	-	-	0.06	97.57	78
PL39-12	64.69	0.23	19.84	1.44	-	0.13	0.87	2.34	7.38	0.08	0.01	-	0.09	97.08	72
PL39-12a	62.54	0.95	20.46	1.46	0.09	0.07	1.21	2.74	6.25	0.09	0.01	0.20	0.40	96.29	72
PL39-29	69.06	0.58	18.71	0.97	0.02	-	2.98	2.37	2.22	0.02	0.05	0.15	0.11	97.14	71
PL39-29a	66.58	0.97	17.79	1.87	0.01	0.26	6.30	2.68	1.82	0.02	0.08	0.10	0.11	98.51	71
PL12-4	70.34	0.88	18.35	1.21	-	0.09	2.19	2.82	3.07	0.24	0.04	0.15	0.05	99.35	74
PL12-7	61.63	0.23	16.81	1.03	-	0.11	7.59	1.95	2.54	4.94	0.02	1.08	0.17	97.60	73
PL12-9	68.88	0.67	18.56	1.12	-	0.02	2.62	2.65	3.20	0.09	-	-	0.08	97.87	73
PL12-12	69.25	0.81	18.51	1.22	-	0.01	3.64	1.88	1.77	0.88	0.06	-	0.10	98.11	73
PL12-15	69.42	0.16	18.96	1.19	0.01	0.15	1.06	2.75	2.90	0.59	0.01	0.10	0.09	97.32	73
PL12-25	68.27	0.46	19.23	1.38	0.08	0.28	3.37	2.07	2.62	0.50	-	-	0.12	98.34	73
PL12-30	67.09	0.51	20.67	1.36	0.03	0.08	0.98	2.73	4.55	0.31	-	0.05	0.14	98.44	73
PL26-9	66.93	3.51	17.18	2.16	0.06	0.19	2.25	1.76	2.62	0.83	-	-	0.08	97.56	77
PL26-21	68.63	1.95	18.48	1.45	0.08	0.29	1.48	1.60	2.75	1.24	-	-	0.16	98.07	85
PL13-2	62.47	0.82	17.74	1.40	-	0.17	7.53	2.42	2.65	2.35	0.06	0.41	0.40	98.15	72
PL13-4	68.18	0.51	18.64	1.78	-	0.24	4.61	2.68	2.73	0.17	-	-	0.08	99.60	73
PL13-9	62.39	0.91	16.98	1.96	-	0.43	9.24	2.52	2.20	4.20	-	0.83	0.11	101.39	73
PL13-15	68.86	0.51	17.91	1.05	0.02	0.21	3.79	2.70	2.97	-	0.03	0.31	0.05	98.26	80
PL13-27	68.25	1.07	19.20	0.91	-	0.01	3.56	2.77	2.70	0.25	0.01	0.15	0.16	98.95	78
PL13-29	70.37	0.46	18.45	0.88	-	0.11	1.01	1.92	3.09	0.59	0.05	0.05	0.11	97.05	79
PL13-34	69.36	0.63	18.56	1.20	-	0.16	2.43	2.71	3.31	0.17	0.02	-	0.08	98.60	75

样品号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	SO₃	F	Cl	总量	寄主橄榄石Fo
PL28-5	52.40	1.72	16.72	10.72	0.17	6.48	6.65	1.52	1.20	0.52	0.08	0.29	0.04	98.37	70
PL28-5(1)	50.36	1.77	16.65	10.66	0.10	6.27	6.68	3.42	1.08	0.37	0.01	-	0.03	97.39	70
PL28-8	51.78	1.32	16.06	10.64	0.07	6.64	6.65	2.52	1.28	0.53	0.05	0.25	0.03	97.68	72
PL28-8(1)	51.56	1.35	16.04	10.56	0.18	6.77	6.45	2.84	1.31	0.48	0.07	0.24	0.02	97.77	72
PL28-9	52.57	3.32	12.08	12.67	0.11	6.14	5.89	2.56	1.79	0.66	-	0.10	0.06	97.88	70
PL28-13	53.92	2.30	12.31	12.23	0.10	5.52	5.07	2.48	1.95	0.64	0.10	0.38	0.10	96.90	76
PL28-13(1)	60.23	1.38	13.94	7.48	0.11	4.34	3.41	2.09	1.78	0.24	0.02	0.39	0.01	95.24	76
PL28-13a	62.53	1.29	13.55	6.86	0.06	5.40	2.51	1.96	1.98	0.38	-	-	0.02	96.52	78
PL28-27	59.14	2.11	14.03	7.31	0.02	5.30	2.31	2.31	2.54	1.21	0.15	0.24	0.08	96.63	79
PL28-27a	59.24	2.04	14.11	7.66	0.09	4.95	2.28	2.32	2.58	1.12	0.05	0.10	0.08	96.57	79
PL28-35	56.06	2.41	13.73	8.67	0.02	5.84	4.70	2.79	2.29	0.63	0.03	-	0.07	97.24	77
PL28-35a	55.84	2.17	13.66	8.66	0.04	5.81	4.76	2.83	2.24	0.56	-	0.43	0.06	96.86	77
PLTW-7	52.04	1.78	13.07	11.40	0.14	5.58	6.60	2.44	3.12	1.98	0.20	0.29	0.33	98.78	73
PLTW-14	59.57	0.78	14.26	7.53	-	4.84	3.35	2.74	3.16	0.95	0.04	0.24	0.12	97.44	74
PLTW-14a	59.80	1.01	14.55	7.17	0.04	4.59	3.22	2.39	2.96	1.30	0.01	-	0.12	97.12	73
PLTW-23	54.53	2.17	13.31	10.12	0.05	4.92	6.04	2.53	2.31	0.86	-	0.15	0.06	96.96	73
PL13-1	54.81	1.53	13.34	9.89	0.16	5.78	6.35	2.52	1.87	0.61	0.06	-	0.03	96.92	72
PL13-12	52.60	2.12	12.38	11.14	0.02	7.08	6.84	2.64	1.16	0.52	0.14	0.05	0.04	96.70	71
PL13-25	51.92	2.24	12.81	10.71	-	6.87	6.98	2.65	1.68	0.74	0.05	-	0.06	96.69	72
PL13-36	52.79	1.80	13.13	11.42	0.07	6.58	6.93	2.56	1.75	1.38	0.06	0.05	0.07	98.54	73
PL13-36a	54.99	1.37	13.59	10.06	0.02	6.08	5.72	2.57	2.42	1.11	-	-	0.05	97.98	78
PL39-12	54.63	1.46	14.13	9.86	0.07	5.71	5.49	3.20	1.90	1.06	0.25	0.33	0.05	97.99	74
PL39-12a	58.92	0.53	13.24	9.16	0.08	4.87	4.62	2.85	1.45	0.56	-	0.14	0.03	96.38	74
PL39-21	58.30	1.54	14.73	7.62	0.06	4.65	3.16	3.04	3.65	0.42	-	0.10	0.07	97.26	74
PL39-25	50.87	2.30	12.61	12.40	0.21	6.37	7.30	2.75	1.69	0.64	0.05	0.14	0.08	97.33	74
PL25-5	59.77	0.73	14.16	9.50	0.12	4.44	3.02	2.51	3.18	0.25	0.04	0.43	0.06	98.01	73
PL25-17	54.57	1.98	12.05	12.17	0.17	6.04	5.22	2.64	1.27	0.54	0.24	-	0.02	96.90	71
PL25-28	62.20	0.87	13.80	7.59	-	4.79	2.59	2.78	2.94	0.71	-	-	0.06	98.31	74
PL35-1	49.76	0.99	17.83	9.34	0.05	7.67	7.42	2.56	0.86	0.27	0.04	0.19	0.02	96.91	76
PL35-8	50.40	2.97	13.20	14.50	0.05	6.14	6.52	1.47	1.70	0.13	0.03	0.19	-	97.22	72
PL35-11	60.50	1.45	14.08	7.28	0.15	5.22	2.41	2.58	3.80	0.11	0.02	0.63	0.04	97.99	76
PL35-12	54.26	2.24	12.51	10.61	0.11	6.78	6.94	2.68	0.94	0.47	0.06	0.34	0.03	97.82	72
PL35-28	57.77	1.10	13.17	9.27	0.01	5.30	4.65	2.51	1.72	0.42	0.03	0.24	0.03	96.10	73
PL26-16	62.95	0.64	14.21	8.31	0.11	4.35	3.01	2.60	1.82	0.49	-	-	0.04	98.51	73
PL26-17	59.35	1.28	13.88	8.30	0.05	4.94	3.79	2.72	2.56	0.57	0.09	-	0.03	97.55	73