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In this study, a novel type of composite explosive was prepared by adding titanium fiber into the RDX explosive. The effects of the content of titanium fiber on the performance of the RDX explosive were systematically studied, and the optimal concentration was obtained by comparing its performances with the RDX explosive. Underwater explosion experiments showed the optimal concentration was 15 mass%, in which the value of specific bubble energy, as well as total energy was acquired the maximum. Especially, the energy density of composite explosive with 10 mass% titanium fiber was 10.64 kJ·cm−3, compared with aluminum fiber explosive, which was increased by 17.96%. Meanwhile, results of the MTS809 machine indicated that the optimal concentration was 19.16 volume%, in which the ultimate stress increased by 175%, and critical strain increased by 393%. Additionally, better mechanical properties ensured process safety in the course of transportation and storage of explosives. Therefore, titanium fiber could be a potential energetic additive and played double roles in improving the properties of the RDX explosive significantly including detonation performances and anti-pressure ability. [ABSTRACT FROM AUTHOR]

Carboniferous volcanic rocks are widely distributed in the Jueluotage belt of eastern Tianshan, located in the southern Central Asian Orogenic belt. The petrogenesis and tectonic history of this region have long been a matter of debate. These volcanic rocks erupted in two episodes, with zircon U–Pb ages of ca. 336 Ma and ca. 320 Ma. The ca. 336 Ma volcanic rocks are dominated by arc-like igneous rocks. They show enrichment of light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), and depletion of high field-strength elements (HFSEs) according to the N-MORB-normalized and chondrite-normalized diagrams. However, the ca. 320 Ma volcanic rocks mainly consist of MORB-like igneous rocks that show nearly flat REE patterns. They are also slightly enriched in LILEs and LREEs according to the N-MORB-normalized and chondrite-normalized diagrams. These Carboniferous volcanic rocks are geochemically similar to the back-arc basin basalt (BABB) from the Mariana and Okinawa troughs. The inherited zircon ages of volcanic rocks from the Jueluotage belt show similar trends and features to those of the Central Tianshan Block, suggesting they shared the same basement, at least before the early Carboniferous. The evolution from arc-like volcanic rocks to MORB-like volcanic rocks reflects the development of the back-arc basin in the northern Central Tianshan Block during the Carboniferous. The Palaeo-Asian oceanic plate subducted beneath the Central Tianshan Block. The position of one of the major sutures of the Palaeo-Asian Ocean should be in the north of the Jueluotage belt. The Jueluotage belt may have the same basement as the Central Tianshan Block. The back-arc basin formed above the Central Tianshan ‘whole’ Block due to the subduction-exhumation of the Palaeo-Asian oceanic plate. [ABSTRACT FROM AUTHOR]