Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China

Zhang, Yongbei; Bai, Hua; Yu, Longshi; Sun, Shihua; Jiaxiang, Qiu; Xu, Cheng; Wang, Hao; Wang, Renjing

doi:10.1016/j.pnsc.2008.01.027

Cited by 2 publications

(2 citation statements)

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“…Although the P/Fe ratio exhibits different ranges in both sequences, the P t and Fe t show linear but opposite changes along the two sequences (Figures 2a and 2e), which indicates that the primary Fe and P input derived from the parent materials is competitive. In shallow marine sediments, Fe‐bearing minerals usually exist in the form of carbonate and silicate (siderite and glauconite), while the P‐bearing minerals in the form of phosphate (apatite) (Zhang et al, 2008). Their proportion fluctuates with the sedimentary environment, which controls the depositing of phosphate, silicate, and carbonate from nearshore to offshore areas (Z. R. R Liu & Zhou, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The soils possess lower Fe t and higher Fe d /Fe t in the HP sequence than in the LP sequence, which narrows the differences in Fe d , Hm, and Gt between both sequences. This result can be attributed to a high proportion of primary Fe carbonates in the LP sequence, which is easier to weather than the primary Fe silicates in the HP sequence (Zhang et al, 2008). More importantly, the monotonic decrease in Fe o /Fe d with P/Fe indicates that the crystallinity of iron oxide increases as P/Fe decreases (Figure 2g).…”

Section: Discussionmentioning

confidence: 99%

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Different Enrichment Patterns of Magnetic Particles Modulated by Primary Iron‐Phosphorous Input

Ren

Long

et al. 2020

Geophysical Research Letters

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Magnetic particles associated with iron (Fe) oxides are widespread on the surface of Earth and Mars and serve as reasonable climatic indicators. Ferrimagnetic maghemite (Mgh) and antiferromagnetic hematite (Hm), which dominate magnetism and redness, often coexist or compete with each other in soils and sediments. The formation efficiency of Mgh relative to Hm could be modulated by geochemical background besides climate, especially by phosphate (P), which has a high affinity for the surfaces of precursor iron oxides in natural systems. We investigated two Ferralsol sequences around a P mining field with similar climates and contrasting P/Fe ratios. High P/Fe ratios retard iron oxide crystallization, grain growth, and transformation into Hm, thereby promoting more effective accumulation of ferrimagnetic Mgh as an intermediate product. The lack of ligand-protected effects well interprets asynchronous changes in magnetism and redness in soils and sediments across large spatiotemporal scales, especially in highly weathered soils. Plain Language Summary Iron oxides are critical carriers of magnetism and dyeing agents of soils and sediments. The concentration of pedogenic maghemite (Mgh) and hematite (Hm), which dominate magnetism and redness, is considered to be controlled by the primary iron input and climate conditions. However, phosphate exhibits a high affinity for the surfaces of precursor iron oxides, especially in highly weathered soils. We investigated two Ferralsol sequences around a P mining field with contrasting P/Fe ratios but similar climates. High P/Fe ratios are observed to impede iron oxide crystallization, grain growth, and transformation into Hm, thereby promoting more effective accumulation of ferrimagnetic Mgh as an intermediate product. The presence and absence of ligand-protected effects help explain asynchronous changes in magnetism and color in nature systems across large spatiotemporal scales.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%