Introduction 65 The Munali Ni-sulfide deposit is a magmatic sulfide deposit, located in the ultramafic portion 66 of the mafic-ultramafic Munali Intrusive Complex in the Zambezi Supracrustal Sequence, 67 southern Zambia, 75 km south of Lusaka. ... related to the 1007 apparently magmatic carbonate, and would provide a stronger case for a ...
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 …
4.1 Introduction. Magmatic-Hydrothermal Deposits (Intrusion-Related Deposits) Concentration of metals during magma formation and subsequent cooling …
Carbonate commonly replaces the core of sulfide blebs while retaining the primary magmatic outline. Carbonate replacement of sulfide roughly parallels the overall progression of carbonation of the whole rock, but no systematic relationship of the other intergrowth types to carbonate content is observed in the serpentinites.
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 mechanisms that drive CO 2 production in arc magmas, we examined in detail basaltic …
Magmatic hydrothermal systems sustain a vast, hot and diverse microbial biosphere that represents a deep organic carbon source to ocean carbon budgets.
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.
Magmatic systems host many types of ore deposits, including world-class deposits of copper and gold. Magmas are commonly an important source of metals and ore-forming fluids in these systems. In many magmatic-hydrothermal systems, low-density aqueous fluids, or vapours, are significant metal carriers. Such vapours are water …
Progress towards understanding the formation and evolution of carbonatite magmas has been complicated by their petrological diversity and that of the associated …
The abundance of the carbonate alteration is particularly notable as crustal sources for the CO2 such as marbles or carbonate minerals within the host rocks are very rare. A possible source could be related to the alkaline magmatic suite which, N of the study area, also contains mantle-derived carbonatites.
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 …
Mg-rich olivine and carbonate minerals generally dominate, but some kimberlites contain significant amounts of phlogopite (Mg-rich biotite). Lesser amounts of …
Aqueous fluids in ore-stage apatite and bastnäsite have salinities between 6 and 10 wt% NaCleq. Due to carbonate dissolution below 400 °C and up to 0.14 GPa, …
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 …
For the late-intermediate stage (Qz4-Anh4), using [Sr] of magmatic fluid of the Butte porphyry deposit (ca. 480 ppm 43) and 100 ppm [Sr] for non-magmatic fluid 45, calculation suggests 43% of ...
Here, we evaluate the temporal-latitudinal distribution of neritic carbonate deposits across the Proterozoic and identify similar deposits from North China that together with those from India are ...
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 ...
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 …
Carbonatites are igneous rocks with significant amounts of magmatic carbonate (>50 vol% 1), only little silica, and their origin remains uncertain.Field observations often show a close spatial ...
Additionally, the magnetite could have formed from magmatic fluids that had exchanged O isotopes with SO2 and CO2 that, in turn, had been derived by the magmatic assimilation and/or metamorphic ...
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 intrusion-related deposits of gold and other metals. The solubility of CO2 increases with pressure and magma alkalinity. Its solubility is low relative to that of H2O, so that fluids …
Fluid inclusion data from the Carlin-like deposits in China (Su et al., 2009) also plot in the magmatic vapor field . Although occurring in deposits similar to the Carlin deposits, these inclusions contain significant CO 2 and formed at higher pressure and temperature conditions than the Carlin fluids studied here (Su et al., 2009).
Here we present direct evidence of abundant CO 2 in basaltic rocks from the end-Triassic Central Atlantic Magmatic Province (CAMP), through investigation of gas …
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 …
CO 2 storage in magmatic rocks is considered a promising method to mitigate this situation. After screening and analyzing the relevant literature, this review …
Here we review the important reactions that control the concentration of carbon dioxide in our atmosphere: outgassing from magmas during volcanic eruptions …
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
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 ...
Taking the average masses of the magmatic starting material and the carbonate used in each experimental series, we calculate that 4.29 mg CO2 (7.02 wt%), 4.28 mg CO2 (7.0 wt%), and 2.9 mg CO2 (4.75 wt%) can be produced for the Merapi dry, Merapi wet, and Vesuvius wet experiments, respectively.
Structural and alteration relationships suggest that carbonate replacement mineralization is syn- to postemplacement of the late Oligocene Stratoni granodiorite stock at 25.4 ± 0.2 Ma. The Olympias Au-Ag-Pb-Zn carbonate replacement deposit, located north of the Stratoni fault zone, is hosted in marble and associated semibrittle structures.
355 The lobate silica–carbonate deposits surrounding Poghorovorughala hot springs (Fig. 6) 356 contain carbonates, with anhydrite and opal-A. In these deposits, CO 2 loss causes carbonate 357 precipitation, and evaporation precipitates anhydrite and silica, similar to the spiculose facies.
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).
Mixing of the alkaline fluids with ambient seawater produces up to 60-m-high, carbonate–brucite towers within the field (Fig. 2f; Supplementary Movies 3 and 4) and results in carbonate deposits ...
