四川盐源小高山晚二叠世玄武岩矿物学、年代学、地球化学特征及源区和成因意义-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

四川盐源小高山晚二叠世玄武岩矿物学、年代学、地球化学特征及源区和成因意义

Mineralogical, geochronological, geochemical characteristics and petrogenesis significances of the Late Permian basalts in Xiaogaoshan, Yanyuan, Sichuan

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DOI	10.20086/j.cnki.yskw.2025.4108
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(3)
作者	李宏博，章西焕，杨小男，彭艳菊，李常权,
作者单位	1. 中国地质博物馆, 地质标本研究与检测实验室, 北京 100034; 2. 中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083
摘要	高钛/低钛玄武岩的源区特征和成因机制是大火成岩省研究的重要科学问题,峨眉山大火成岩省亦是如此。本文针对四川盐源小高山晚二叠世玄武岩开展了矿物学、年代学、地球化学和同位素特征研究,结果表明小高山玄武岩属于钠质拉斑玄武岩系列。单斜辉石的结晶温度为1 061~1 180℃,压力为190~352 MPa。Fe-Ti氧化物的X_Mt值(0.24~0.38)指示了较低的氧逸度,有利于向Fenner趋势演化。LA-ICP-MS锆石U-Pb年代学分析结果表明小高山晚二叠世玄武岩的结晶年龄为260.2±5.0 Ma,是峨眉山溢流玄武岩喷发峰期的产物。稀土和微量元素模式图与洋岛玄武岩(OIB)相似,并呈现向E-MORB过渡的趋势。(⁸⁷Sr/⁸⁶Sr)_i=0.704 650~0.705 035, εNd(t)=+2.91~+3.02。地球化学和同位素特征表明小高山晚二叠世玄武岩未遭受明显地壳混染,源区以地幔柱组分为主,与平川铁矿苦橄斑岩具有同源性,是连续演化的产物。REEBOX PRO模拟表明,峨眉山玄武岩的源区组分具有原始地幔特征。当岩石圈较厚(140 km)时,只能产生高钛玄武岩(t_p=1 550~1 690℃)。岩石圈大幅减薄之后(50 km),扩大的熔融区间(t_p =1 400~1 690℃)既可以熔出高钛玄武岩,也可产生低钛玄武岩。因此,峨眉山低钛/高钛玄武岩可由同一地幔源区经过连续熔融产生。模拟还表明小高山玄武岩形成于较薄岩石圈条件,形成的温压范围是1 403℃/2.38×10³ MPa~1 557℃/3.55×10³ MPa。
Abstract	The source characteristics and origin of high-Ti (HT) and low-Ti (LT) magma types are the first-order geodynamic question for the Large Igneous Provinces (LIPs) and mantle plume, especially the Emeishan LIP (ELIP). In this study, we report LA-ICP-MS zircon U-Pb ages, as well as mineralogical, geochemical, and Sr-Nd isotopic data on the Late Permian basalts in the Xiaogaoshan, Yanyuan, Sichuan. The Xiaogaoshan basalts can be classified as LT/HT transitional type and sodic tholeiitic rock series. Clinopyroxene crystallization temperature and pressure are 1 061 to 1 180℃ and 190 to 352 MPa. The X_Mt of Fe-Ti oxides (0.24 to 0.38) indicates a relatively low oxygen fugacity environment and the Fenner trend of fractional crystallization (evolving to iron-enriched). The zircon U-Pb data yield age is 260.2±5.0 Ma, i.e., the peak magmatism of the ELIP. The chondrite-normal- ized rare earth elements (REE) patterns and the primitive mantle-normalized spidergrams show oceanic island basalt (OIB) affinity, with a trend to E-MORB (enriched Mid-Ocean Ridge Basalts). The rocks have low age-corrected (⁸⁷Sr/⁸⁶Sr)_i ratios (0.704 650 to 0.705 035) and positive εNd(t) values (+2.91 to +3.02). The geochemical and isotopic features suggest that the lavas have not undergone any significant crustal contamination, and the source is dominated by "plume" components. The Late Permian Xiaogaoshan basalts have a co-genetic relationship with the picritic porphyries in the Pingchuan iron oxide deposit via fractional crystallization. REEBOX PRO modeling of the adiabatic decompression melting for the Emeishan basalts indicate that the mantle sources of the Emeishan basalts are characterized by the primitive mantle (PM). Only HT basalts can be generated at elevated mantle potential temperatures (t_p=1 550℃ to 1 690℃) beneath a lithosphere that is 140 km thick. In contrast, expanded melting temperatures (t_p=1 400℃ to 1 690℃) and regime spread over LT and HT basalts beneath a considerably thinned lithosphere (50 km). Therefore, the origin of the Emeishan basalts, both LT and HT, is through a continuous melting process of the same source. The modelling suggests that the Xiaogaoshan basalts most likely formed under a thinner lithosphere (50 km), with melting temperature and pressure conditions of 1 403℃/2.38×10³ MPa to 1 557℃/3.55×10³ MPa.
关键词	地球化学；Sr-Nd同位素；REEBOX PRO模拟；峨眉山大火成岩省；地幔柱；四川盐源小高山
KeyWord	geochemistry; Sr-Nd isotope; REEBOX PRO modeling; Emeishan Large Igneous Province; mantle plume; Xiaogaoshan, Yanyuan, Sichuan
基金项目
页码	501-521

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李宏博，章西焕，杨小男，彭艳菊，李常权. 四川盐源小高山晚二叠世玄武岩矿物学、年代学、地球化学特征及源区和成因意义 [J]. 岩石矿物学杂志. 2025; 44; (3). 501 - 521.

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