Volcanogenic CO2 Degassing in the Songliao Continental Rift System, NE China

Volcanogenic CO2 Degassing in the Songliao Continental Rift System, NE China
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中国东北部松辽大陆裂谷系火山产生的二氧化碳脱气

DOI:
10.1155/2019/8053579
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发表时间:
2019-08
期刊:
影响因子:
1.7
通讯作者:
Zheng Guodong
Zheng Guodong
中科院分区:
地球科学4区
文献类型:
--
作者:
Zhao Wenbin;Guo Zhengfu;Lei Ming;Zhang Maoliang;Ma Lin;Fortin Danielle;Zheng Guodong

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五大连池单岩火山田(WMVF)位于中国东北部主要大陆裂谷系统内的松辽盆地。冒泡的泉水和土壤中的扩散脱气是 WMVF 的典型特征。化学成分和C-He同位素分析表明,冷泉气体可能源自富集的上地幔(EM),这是地幔过渡带(MTZ)的板片物质(俯冲有机沉积物和碳酸盐)与周围贫乏地幔混合的结果。这些电磁衍生的挥发物在上升到地表的过程中经历了不同程度的地壳输入,包括大陆有机变沉积物和地壳碳酸盐。脱气CO2通量的估算结果,结合前期地球物理证据,表明第四纪早期到晚期,CO2脱气活动逐渐减弱。
The Wudalianchi monogenetic volcanic field (WMVF) is located in the Songliao basin within a major continental rift system in NE China. Bubbling springs and diffuse degassing from soils are typical features of the WMVF. Chemical compositions and C-He isotope analyses revealed that the cold spring gases might originate from the enriched upper mantle (EM), which resulted from the mixing between slab materials (subducted organic sediments and carbonates) in the mantle transition zone (MTZ) and the ambient depleted mantle. These EM-derived volatiles experienced variable degrees of crustal input, including both continental organic metasediments and crustal carbonates during their ascending path to the surface. The estimated results of the degassing CO2 fluxes, combined with previous geophysical evidence, suggest that the CO2 degassing activities become weaker from early to late in Quaternary.
DOI: 10.1007/978-3-319-78527-1
发表时间: 1973
期刊: Stable Isotope Geochemistry
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