Carbon dioxide is known to be a major component of Archaean Au-quartz vein fluids 5; for this reason, the carbon isotopic composition of the carbonate in the Hollinger deposit

The accumulation of magmatic CO 2 beneath low-permeability barriers may lead to the formation of CO 2-rich gas reservoirs within volcanic systems.Such accumulation is often evidenced by high surface CO 2 emissions that fluctuate over time. The temporal variability in surface degassing is believed in part to reflect a complex interplay between …

Current evidence supports the view that almost all of this carbonate was chemogenic in origin, precipitated from hyper-alkaline, shallow lake waters, probably by evaporation. This unit, best documented from offshore Brazil and known as the Barra Velha Formation (Santos Basin) and the Macabu Formation (Campos Basin), consists of just …

The flotation of sulfide-bubble compounds in magmas plays an important role in forming Cu-Au hydrothermal seafloor ore deposits, according to petrographic observations, geochemical and physical ...

An intimate relationship between magmatic sulfides and carbonate phases has recently been observed in the mineralized mafic intrusions that make up the Munali deposit in Zambia ( Holwell et al ...

Here we present direct evidence of abundant CO2 in basaltic rocks from the end-Triassic Central Atlantic Magmatic Province (CAMP), through investigation of gas exsolution bubbles preserved by melt ...

Field photographs showing various rock types in the studied area. Intense modification of country rocks is unrecognizable and sharp contact between skarn and crystalline limestone is common in the ...

The Xianghualing large tin-polymetallic skarn deposit is located in the Nanling W-Sn metallogenic belt, South China, showing distinct spatial zoning of mineralization. From the contact between granite and carbonate rocks, the mineralization transitions from proximal skarn Sn ore to cassiterite-sulfide ore and more distal Pb–Zn …

Introduction. Carbonatites are igneous rocks with significant amounts of magmatic carbonate (>50 vol% 1), only little silica, and their origin remains uncertain. …

This review focuses on the solubility, origin, abundance, and degassing of carbon dioxide (CO 2) in magma–hydrothermal systems, with applications for those workers interested …

The rare earth elements (REEs) have unique and diverse properties that make them function as an "industrial vitamin" and thus, many countries consider them as strategically important resources. China, responsible for more than 60% of the world's REE production, is one of the REE-rich countries in the world. Most REE (especially light rare …

Copper and Fe deposits within the Palabora alkaline-carbonatite complex were discovered and mined for copper and iron by African tribes about 1300 A.D. (Heinrich Citation 1970), long before …

This review focuses on the solubility, origin, abundance, and degassing of carbon dioxide (CO2) in magma-hydrothermal systems, with applications for those workers interested in …

Geotectonic maps showing the location of the Qinling orogen (a) and the distribution of early Silurian alkali magmatic rocks and related Nb-REE deposits in the …

Carbonatites are igneous rocks formed in the crust by fractional crystallization of carbonate-rich parental melts that are mostly mantle derived. They dominantly consist of carbonate minerals such as calcite, dolomite, and ankerite, as well as minor phosphates, oxides, and silicates. They are emplaced in continental intraplate settings such as …

The contribution of CO 2 from crustal carbonates into arc magmas is debated, as is its role in the long-term C cycle. To better understand the contributions and …

The Jinchuan Ni-Cu deposit is one of the largest magmatic sulfide deposits in the world, but the cause of sulfide saturation remains unclear. It has been suggested that sulfide saturation in the ...

Stefan T.M. Peters, Narges Alibabaie, Andreas Pack, Seann J. McKibbin, Davood Raeisi, Niloofar Nayebi, Farhad Torab, Trevor Ireland, Bernd Lehmann; Triple oxygen isotope variations in magnetite from iron-oxide deposits, central Iran, record magmatic fluid interaction with evaporite and carbonate host rocks: REPLY.

Apatite can incorporate significant amounts of H2O and CO2, potentially recording volatile abundance and behavior during magma evolution. ... and the distribution of early Silurian alkali magmatic rocks and related Nb-REE deposits in the South Qinling Belt (b). ... the unmixing of carbonate melts leads to a significant drop in REE contents …

Here we review the important reactions that control the concentration of carbon dioxide in our atmosphere: outgassing from magmas during volcanic eruptions and during …

Direct melting of the recycled carbonate sediments would produce primary ... on the genesis of magmatic ore deposits. Nature Geosci 6, 905–910 (2013). ... mantle caused by carbon dioxide. Nature ...

A carbonatite-related deposit could consist of unaltered magmatic minerals; minerals that crystalised from carbohydrothermal, hydrothermal, or metamorphic fluids transporting metals; or minerals concentrated by weathering or supergene enrichment, …

A role for evaporites to promote carbonate melting at Chating—also consistent with sulfur isotopic data both at Chating and in other deposits in the region (Zhang, 1986; Xiao et al., 2021)—is similar to the process of carbonate-sulfate melt production in iron-oxide-apatite (IOA) deposits (Bain et al., 2020, 2021).

The activity of melts and fluids may have played a key role in inducing the destruction of the eastern North China Craton in the early Cretaceous. Carbonate melts are important agents in mantle metasomatism and can significantly modify the physical and chemical properties of the subcontinental lithospheric mantle. Carbonate metasomatism …

This review provides a comprehensive assessment of CO 2 storage in magmatic rocks. First, the core storage mechanisms are discussed. Second, a detailed …

The conclusion that magnetite from the iron-oxide deposits in central Iran formed from magmatic fluids that had interacted with evaporite and carbonate rocks is in good agreement with the continuum that is found between, respectively, magmatic and crustal δ 34 S in sulfide minerals from the deposits, and also with the continuum …

Porphyry deposits are copper-rich orebodies formed by precipitation of metal sulphides from hydrothermal fluids released from magmatic intrusions that cooled at depth within the Earth's crust.

DOI: 10.1016/J.EPSL.2015.05.053 Corpus ID: 126612555; An Early Pleistocene atmospheric CO2 record based on pedogenic carbonate from the Chinese loess deposits @article{Da2015AnEP, title={An Early Pleistocene atmospheric CO2 record based on pedogenic carbonate from the Chinese loess deposits}, author={Jiawei Da and Yi Ge …

The magmatic–hydrothermal evolution of the El Laco deposit (Chile) and its implications for the genesis of magnetite–apatite deposits. Econ. Geol. 112, 1595–1628 (2017).

2.8.1 Magmatic Ore Deposits. A magmatic ore deposit is formed by an accumulation of magmatic minerals. Some of them are extremely rare and almost never encountered in common rocks (e.g., alloys of the platinum metals). However, other minerals such as magnetite are common. A very large and diverse group of ore deposits …