Geochemical characteristics of phosphorite and carbonate …
Phosphorite and phosphatic sediments have attracted geological interest since phosphorite nodules were discovered by the H.M.S ... Two different types of phosphate nodules can be recognized based on REE and Nd isotopic characteristics: type 1 with seawater-like REE patterns, higher εNd(t) values; and type 2 with hat-shaped REE patterns and ...
Geochemical and mineralogical characteristics of deep-sea …
However, there are analogies to the geochemical characteristics of the REY-rich sediments and the phosphorite-type ore deposits. Their REY enrichments are both related to phosphate (Emsbo et al., 2015, Nakamura et al., 2015). According to Emsbo et al. (2015), the sedimentary phosphate deposits also have seawater-like REY patterns.
Geochemical Characteristics and Formation Mechanism of Phosphorite …
During the Meishucun period of the Early Cambrian, a large-scale phosphorus formation event occurred on the Upper Yangtze platform. As the product of this event, the sedimentary environment and formation mechanism of phosphorite remains elusive. In order to better understand the sedimentary environment and formation mechanism of phosphorite enrichment, …
Geochemical Characteristics of Dolomitic …
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 deposit was characterized by …
Investigation on release and migration characteristics of …
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 ...
Geochemical characteristics of Early Cambrian phosphate …
(a) Field photograph showing bedded phosphorite with layers of bedded phosphate alternate with clayey and shaly bands; (b) sample photograph showing laminations of collophane in a matrix of ...
DEPOSITIONAL ENVIRONMENT AND WORLD DISTRIBUTION …
Phosphorite is an important nonmetallic mineral resource in the ocean. The total amount of the P2O5 resource is about 20×109 tons in the ocean. ... Ogihara S. Geochemical characteristics of phosphorite and carbonate nodules from the Miocene Funakawa Formation, western margin of the Yokote Basin, northeast Japan[J]. Sedimentary Geology, 1999 ...
Studies on geochemical characteristics and …
The geochemical 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 a high-temperature ...
Phosphorite : Properties, Composition, Uses, Deposits
Phosphorite, or phosphate rock, can be classified into different types based on its mineral composition and geological characteristics. The two main types of phosphorite are sedimentary phosphorite and igneous phosphorite.
Diagenesis of Ediacaran − early Cambrian phosphorite: …
These characteristics indicate that old phosphorite could have been subjected to long-term diagenetic modification after burial, during which apatites recrystallized and absorbed REE + Y. Hence, it can be concluded that recent apatites could serve as predecessors of major ancient phosphorite, especially biogenic phosphorites.
Phosphorite | Definition, Formation, & Uses | Britannica
phosphorite, rock with a high concentration of phosphates in nodular or compact masses. The phosphates may be derived from a variety of sources, including marine invertebrates that …
Phosphorites
Phosphorites are rocks enriched in phosphorus relative to average crustal abundances, an enhancement usually expressed in terms of P 2 O 5 concentrations.
Geochemical characteristics of Triassic and Cretaceous phosphorite …
S154 GEOCHEMICAL CHARACTERISTICS OF TRIASSIC AND CRETACEOUS PHOSPHORITE HORIZONS suggest that the phosphorite horizons formed syngenetically with the deposition of the limestone. The phosphorite layers are finely zoned which may have been caused by the organic matter content (Fig. 6b).
Studies on geochemical characteristics and …
Combined with the biological fossil assemblage and the characteristics of the phosphorite, the low tidal energy environment was not conducive to the deposition of phosphorite because the biota was not prosperous and the biological and biochemical interactions were weak, which was not conducive to phosphorus precipitation. ...
Phosphorite generative processes around the Precambrian …
According to the petrologic characteristics, the phosphorite from Upper Dousahntuo and Gezhongwu Formation were mainly composed of microbial debris (Fig. 6 j–l). The δ 18 O p values in the Gezhongwu Formation have a wider range than those of the Doushantuo Formation, especially the Lower Doushantuo.
Reducing-condition reworked phosphorite sedimentary …
This is supported by the petrographic and mineralogical characteristics of the Thaniyat phosphorite with the observation of quartz grains and matrix composition. The influence of terrestrial input on the sediment composition decreased northward compared to the regional locations. This is consistent with the paleogeography of the Neo-Tethys ...
(PDF) Phosphorus and Phosphorites: …
We define primary phosphogenesis, which produces primary phosphorite, as the process of carbonate fluorapatite precipitation within sediments, at the sediment/water interface and/or during...
The Mineralogy and Geochemistry of Phosphorites
Altschuler ZS (1980) The geochemistry of trace elements in marine phosphorites. Part I. Characteristic abundances and enrichment. In: Bentor YK (ed) SEPM Spec Publ 29:19–30. Google Scholar Altschuler ZS, Cisney EA, Barlow IH (1952) X-ray evidence of the nature of carbonate-apatite. Geol Soc Am Bull 63:1230–1231
Geochemical characteristics of Triassic and Cretaceous …
FIG.5.(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 ...
Geological and geochemical evaluation of phosphorite …
Compositional characteristics of the studied phosphorites, in terms of trace and REE, are similar to those of the Eastern Mediterranean phosphorites, but clearly different from those of the North African phosphorites. ... The studied phosphorite localities are essentially carbonaceous phosphorites with similar major constituents (P 2 O 5 and ...
Geochemical Characteristics of Trace Elements and …
This paper briefly summarizes the distribution characteristics of phosphate rock resources and summarizes the characteristics and research progress of Ediacaran-early Cambrian phosphorus mineralization types, …
(PDF) Geochemical Characteristics of Trace Elements and …
The Ediacaran-early Cambrian sedimentary phosphorite deposits in China are mainly distributed in Yunnan, Guizhou, Hubei, Sichuan and Hunan provinces of the Yangtze platform, in which the early ...
Phosphorite geochemistry: State of the art and …
This work is reviewed and considered in relation to environmental issues arising from the exploitation of phosphorite deposits. Unaltered phosphorites contain francolite, a highly substituted carbonate fluorapatite, as the only phosphate mineral. ... which govern many of the primary geochemical characteristics of phosphorites, although ...
Studies on geochemical characteristics and biomineralization …
With this in mind, the geochemical characteristics of the Cambrian phosphorites in Zhijin (Guizhou, China), the characteristics of the biological assemblages in the different …
REE Geochemical Characteristic of Apatite: …
minerals Article REE Geochemical Characteristic of Apatite: Implications for Ore Genesis of the Zhijin Phosphorite Liu Xiqiang 1,2, Zhang Hui 1,*, Tang Yong 1 and Liu Yunlong 3 1 Key Laboratory of ...
Enrichment of rare earth elements in the early Cambrian …
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 ...
Geochemical Characteristics of Dolomitic Phosphorite …
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 ...
Phosphorite
Phosphorite is a type of sedimentary rock that is the most significant source of phosphate rock globally. It is primarily composed of carbonate-fluorapatite and forms in marine environments, …
Geological and geochemical evaluation of phosphorite …
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 …
Enrichment characteristics and sources of the critical metal …
Yttrium (Y) is a critical metallic element that is used widely in modern scientific, technological, and industrial applications. Phosphorites in the Zhijin area of Guizhou Province, China, are famous for Y enrichment, but the enrichment characteristics and sources remain unclear. Previous studies suggested that the sources of rare earth elements (REEs, La–Lu) …