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SUMMARY:Pioneer plant driven primary mineral weathering and secondary mine
 ral formation in Fe ore tailings
DTSTART;VALUE=DATE-TIME:20211124T050500Z
DTEND;VALUE=DATE-TIME:20211124T052000Z
DTSTAMP;VALUE=DATE-TIME:20260814T123935Z
UID:indico-contribution-4308@events01.synchrotron.org.au
DESCRIPTION:Speakers: Songlin Wu (The University of Queensland)\nEco-engin
 eering tailings into soil-like substrates is an emerging technology to reh
 abilitate the tailings landscapes. Pioneer plants play an important role i
 n mineral weathering and secondary mineral formation\, which are pre-requi
 sites for aggregate formation and pedogenesis in the tailings. The present
  study aimed to characterise the direct role of pioneer plant roots in tai
 ling mineral weathering and secondary mineral formation in a compartmented
  cultivation system [1]. It was found that root activities accelerated the
  weathering of Fe bearing primary minerals (e.g.\, biotite) via Fe(II) oxi
 dation coupled with Fe(III) and Si dissolution. Numerous nanosized Fe-Si r
 ich amorphous minerals and vermiculite were neo-formed in the tailings sub
 ject to rhizosphere activities\, as revealed by various micro-spectroscopi
 c analysis. The Fe-Si rich secondary amorphous minerals may have resulted 
 from co-precipitation of dissolved Fe(III) and Si on mineral surfaces unde
 r alkaline and circumneutral pH conditions. The roots of Gramineae plant S
 orghum spp. developed most extensively in the tailings\, leading to more e
 fficient mineral weathering and secondary mineral formation than Halophyte
  plant Atriplex amnicola and Leguminous plant Acacia chisholmii. Overall\,
  the study has unravelled the pioneer plant role in tailing mineral (bioti
 te dominant) weathering and secondary Fe-Si mineral formation. These findi
 ngs also indicate that tolerant pioneer plants may act as integral compone
 nts in designing the eco-engineering processes for soil formation in Fe or
 e tailings.\nReferences:\n[1] Wu\, S.\, Liu\, Y.\, ... & Huang\, L. (2021)
 . Rhizosphere Drives Biotite-Like Mineral Weathering and Secondary Fe–Si
  Mineral Formation in Fe Ore Tailings. ACS Earth and Space Chemistry\, 5(3
 )\, 618-631.\n\nhttps://events01.synchrotron.org.au/event/146/contribution
 s/4308/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4308/
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