科研之友
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摘要
The flood basalts from Xiahenan, Tarim Basin is mostly well-known for its horizontally layered exposure, which retains the relatively primary petrogenetic and diagenetic forms of the lavas and the intercalated sediments. It is the ideal outcrop for studying the Permian magmatism in Tarim Basin, also the best reference for other basaltic eruption events from other regions within the basin. This work introduces the field occurrence as well as lithologic and petrographic features of Xiahenan basalts based on detailed field observation and remote sensing interpretation. The geochemical characteristics of each basalt layer have been illustrated. The results show that the basaltic magma of Xiahenan were derived from an enriched lithospheric mantle, by low degree partial melting of spinet garnet lherzolite, followed with medium degree of fractional crystallization and lesser extent of crustal contamination. The geochemical diversity among basalts within a layer is attributed to fractional crystallization, while the geochemical variations between different layers are controlled by the degree of partial melting. All the layers of basalts from Xiahenan were originated from the same mantle source, which is also similar to Keping basalts, with a good correlation to six layers of Kaipaizileike basalts from Keping region. This study further clarified the spatial distribution of the Permian flood basalts in Tarim Basin, and confirmed that the basaltic magmatism of Tarim LIP extends from Keping region to Xiahenan, as well as to central and southwest Tarim Basin.
- 出版日期2017
- 单位中山大学; 浙江大学; 国家海洋局第二海洋研究所
