The carbonate dominated Mesozoic sequence of the Transdanubian Mountain Range contains Triassic uranium enriched phosphorite layers and Cretaceous REE enriched nodular investigation of these deposits may have an economic benefit because of their large U and REE contents The dominant minerals in the Triassic phosphorite are
a Location of the fossil and phosphorite bearing hardground of Tata 2 between the Valanginian bedrock 3 and the Aptian cover rock 1 ; b hypothetical model for the preservation of the condensed basal beds at Kálvária Hill Bottom flows accumulated fossils in the GEOCHEMICAL CHARACTERISTICS OF TRIASSIC AND CRETACEOUS PHOSPHORITE
characteristics of phosphorite and there is a significant di erence between weathered ore and primary ore regardless of their characteristics or grade [8] Relative to fresh phosphorite
Although characteristics of the Zhijin phosphorite have been well constrained the major factors controlling REY enrichment remain unknown To address this the research studied the REY occurrence
The characteristic REYs data of oxidized seawater terrestrial phosphorites and Mid Ocean Ridge and Zhijin phosphorites are shown in Table 9 Among them the sample ZKX001 648 is Zhijin phosphorite which is negative Ce anomaly and positive Y anomaly no Eu anomaly or weak positive Eu anomaly data from this study
Phosphorite deposits occur in igneous and sedimentary rock Marine type sedimentary deposits represent the most economically significant phosphorites Fig 1 About 80 % of the world s phosphate production is derived from deposits of sedimentary marine origin around 17 % is derived from igneous rocks and the remainder comes from residual
Phosphorite is a valuable resource with various applications in different industries [38] [39] [40] which is composed mainly of SiO 2 Ca 5 PO 4 3 F [41][42] When coal is mixed and burned with phosphorite the SiO 2 Al 2 O 3 and Ca 5 PO 4 3 F in the phosphorite can react with sodium reducing the release of sodium Simultaneously
DOI /S0037 0738 98 00136 5 Corpus ID 128797233; Geochemical characteristics of phosphorite and carbonate nodules from the Miocene Funakawa Formation western margin of the Yokote Basin northeast Japan
the distribution characteristics of phosphate rock resources and summarizes the characteristics and research progress of Ediacaran early Cambrian phosphorus mineralization types geological characteristics and deposit genesis of the Yangtze platform in South China The Ediacaran early Cambrian sedimentary phosphorite
Phosphorite provides a valuable record of palaeoceanographic changes through Earth s history and also holds significant economic importance Filippelli 2011; Compton and Bergh 2016 It is the most important long term sink in the global phosphorus cycle Föllmi 1996; Nelson et al 2010 The accumulation of phosphorite on geological timescales is associated
With increasing load the difference of infrared radiation temperature between the phosphorite specimen and the reference generally shows a fluctuating upward trend In the early stage of failure the temperature difference increases sharply and the temperature difference reaches a maximum before the stress reaches the peak
The primary phosphorite is a dolomitic phosphorite containing rare earth elements which are naturally enriched by weathering and its weathered ore has obvious residual enrichment while the
As a repository of REE the Paleoproterozoic phosphorite of the Aravalli Basin in India is explored time to time Paleoproterozoic phosphorite deposits of the Sallopat sub basin Banswara district of the Aravalli Supergroup show moderate REE concentrations much lower than that of average marine phosphorites Different ratios and PAAS normalized REE distribution
characteristics of phosphorite and there is a significant di erence between weathered ore and primary ore regardless of their characteristics or grade [8] Relative to fresh phosphorite weathered phosphorite is generally enriched in alkali metals alkaline earth elements halogen and radioactive elements and depleted in mantle elements [7 9]
The Ediacaran Doushantuo Formation ca 635 551 Ma in South China is a significant phosphorite producer in E C Phosphogenic Events She et al 2013 She et al 2014 Zhang et al 2019 Yang et al 2019 Yang et al 2021 Jiao et al 2022 which is one of the most important resources for phosphate fertilizer in China and contains exceptionally high P
Studies on geochemical characteristics and biomineralization of Cambrian phosphorites Zhijin Guizhou Province China analysis of several profiles in the Zhijin phosphorite block shows that the phosphorite block was deposited in an oxygen rich environment and was affected by
Although characteristics of the Zhijin phosphorite have been well constrained the major factors controlling REY enrichment remain unknown To address this the research studied the REY occurrence forms and enrichment mechanisms Accordingly carbonate C and O isotopes micropetrographic and in situ geochemical analyses of Zhijin phosphorites
Phosphorite and phosphatic sediments have attracted geological interest since phosphorite nodules were discovered by the Challenger on the Agulhas Bank in 1974 Murray and Renard 1981 Additional phosphorite nodules were recovered from the ocean floor from different parts of the world such as off the Spanish north seashore Lucas et al 1978
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