CO 2 rich fluids during regional metamorphism on Naxos (Greece); carbon isotopes and fluid inclusions

1980 ◽  
Vol 280 (8) ◽  
pp. 745-771 ◽  
Author(s):  
R. Kreulen
Keyword(s):  
Carbon Isotopes ◽  
Fluid Inclusions ◽  
Regional Metamorphism

Evidence for early fluid channelization, Pikwitonei granulite domain, Manitoba, Canada

1992 ◽  
Vol 29 (8) ◽  
pp. 1701-1716 ◽  
Author(s):  
Julie K. Vry ◽  
Philip E. Brown
Keyword(s):  
Carbon Isotope ◽  
Fluid Inclusions ◽  
Regional Metamorphism ◽  
Fluid Phase ◽  
Garnet Growth ◽  
High Grade ◽  
Low Oxygen ◽  
The North ◽  
Rock Types ◽  
Lake Region

The results of field mapping and carbon isotope and phase equilibria studies suggest that two different, locally controlled fluid regimes existed during at least the early phases of high-grade metamorphism in the north Cauchon Lake region, Pikwitonei granulite domain, Manitoba, Canada. During the prograde stages of high-grade "anticlockwise" regional metamorphism, rocks already metamorphosed to at least sillimanite grade were thermally metamorphosed at temperatures near 900 °C by the intrusion of a charnockitic magma. It is likely that this magma released an oxidizing, CO2-bearing, probably CO2-rich fluid phase while the region was still at relatively shallow depths. Fluid migration was channelized along the intrusive contact, and local fluid buffering characterized many of the country rocks. The light carbon isotope values of graphites (gr) and CO2 in cordierites (crd) in pelitic lithologies (δ13Cgr = −41.8 to −30.4; δ13Ccrd = −31.8 to −34.9), and the low oxygen fugacities in many samples rule out infiltration of these units by large amounts of an externally derived CO2-rich fluid phase. Texturally early CO2-rich fluid inclusions occur in the cores of garnets in a variety of rock types along the intrusive contact. These fluid inclusions were probably trapped during early garnet growth at high temperatures and relatively low pressures, and appear to have undergone limited or no subsequent reequilibration. They do not appear to provide direct information about the highest regional metamorphic temperature and pressure conditions to have affected the region (750 °C and 7 kbar (1 kbar = 100 MPa)) but may instead retain evidence of the prograde metamorphic path. These studies demonstrate the importance of local controls on the sources, compositions, timing, and transport of metamorphic fluids in the north Cauchon Lake region.

High-temperature brine in chalcopyrite-rich quartz vein 40 km southwest of Sudbury, Ontario

2011 ◽  
Vol 48 (10) ◽  
pp. 1369-1385 ◽  
Author(s):  
Eva S. Schandl ◽  
Michael P. Gorton ◽  
Colin J. Bray
Keyword(s):  
High Temperature ◽  
Fluid Inclusion ◽  
Fluid Inclusions ◽  
Minimum Temperature ◽  
Tectonic Evolution ◽  
Quartz Vein ◽  
Regional Metamorphism ◽  
Dissolved Metals ◽  
Igneous Complex ◽  
Sudbury Igneous Complex

The Lac Panache (Nipissing) gabbro intrudes Huronian metasediments ca. 40 km southwest of the Sudbury Igneous Complex. The gabbro contains disseminated sulfides and is in contact with a chalcopyrite-rich quartz vein that crystallized from highly saline fluids (46.8 ± 3 equivalent wt.% NaCl) at a minimum temperature of 420 ± 27 °C. Chloride and carbonate inclusions in opened fluid inclusion cavities in the vein suggest that the brine contained dissolved metals (in addition to NaCl), such as Fe, Cu, Mn, and Co. The weakly altered quartz vein postdated regional metamorphism and was probably contemporaneous with the 1.7 Ga felsic magmatism and attendant albite alteration in the area. Cl-rich scapolite in the gabbro and highly saline fluid inclusions in the quartz vein suggest the existence of circulating hot brine throughout the tectonic evolution of the region. The 2.2 Ga old gabbro contains an abundance of Cl-rich scapolite intergrown with pyrrhotite and chalcopyrite that formed during the early hydrothermal (deuteric) alteration of the gabbro.

scholarly journals Formation of Diagenetic Minerals in the Carboniferous Rock Complex from the Fore-Sudetic Monocline (SW Poland): Fluid Inclusion, Isotopic and Raman Constraints

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 976
Author(s):  
Aleksandra Kozłowska ◽  
Katarzyna Jarmołowicz-Szulc ◽  
Marta Kuberska ◽  
Krystyna Wołkowicz
Keyword(s):  
Fluid Inclusion ◽  
Fluid Inclusions ◽  
Regional Metamorphism ◽  
Microscopic Analysis ◽  
Thin Sections ◽  
Mineralogical Characteristics ◽  
Low Degree ◽  
Isotopic Analyses ◽  
Homogenization Temperatures ◽  
Clastic Sedimentary

The paper presents the latest state of knowledge on clastic sedimentary rocks from the Carboniferous complex in the SW part of the Polish Lowlands, studied to help determine their potential prospectivity for the occurrence of oil and/or gas deposits. Rocks were analyzed with respect to the petrographic-mineralogical characteristics of the Carboniferous deposits, their diagenesis, determinations of pressure-temperature conditions of mineral formation and the hydrocarbon occurrence. Analyses were carried out on samples from four selected boreholes in the Fore-Sudetic Monocline. After microscopic analysis of rocks and minerals in thin sections, the following techniques were used: luminescence analysis (UV, blue light), microthermometric analysis of fluid inclusions in double-sided polished wafers, XRD analyses, stable isotopic analyses (carbon, oxygen) on calcite and dolomite-ankerite and Raman spectra of fluid inclusions. Orthochemical components, such as carbonates and authigenic quartz, that form cements or fill the veins cutting the sample material have been studied. Fluid inclusion data in quartz and carbonates result in homogenization temperatures of 74–233 °C. The Raman analysis gives temperature estimations for the organic matter of about 164 °C and 197 °C, depending on the borehole, which points to a low coalification degree. The post-sedimentary processes of compaction, cementation and diagenetic dissolution under eo- and meso-diagenetic conditions to temperatures of over 160 °C influenced the present character of the deposits. P-T conditions of brines and methane trapping have been estimated to be ~850–920 bars and 185–210 °C (vein calcite) and ~1140 bars and 220 °C (Fe-dolomite/ankerite). However, locally, temperatures might have been higher (>200 °C), which may be a symptom of local regional metamorphism of a very low degree.

High integrated fluid rock ratios during metamorphism at Naxos: evidence from carbon isotopes of calcite in schists and fluid inclusions

1989 ◽  
Vol 103 (1) ◽  
pp. 123-126 ◽  
Author(s):  
J. Ben H. Jansen ◽  
Henk Van der Rijst ◽  
Robert O. Rye ◽  
Paul A. M. Andriessen ◽  
Danny M. Rye
Keyword(s):  
Carbon Isotopes ◽  
Fluid Inclusions

scholarly journals Fluid inclusions, H-O-S isotopic characteristics and genesis of the Chambishi copper deposit, Zambia

2021 ◽  
Vol 290 ◽  
pp. 03016
Author(s):  
Hu Qiaofan ◽  
Feng Zuohai ◽  
Mo Jiangping ◽  
Fang Ke
Keyword(s):  
Fluid Inclusions ◽  
Large Scale ◽  
Isotope Geochemistry ◽  
Regional Metamorphism ◽  
Copper Deposit ◽  
Copper Precipitation ◽  
Seawater Sulfate ◽  
Thermochemical Method ◽  
Late Neoproterozoic ◽  
S Isotope

In this paper, fluid inclusions and H-O-S isotope geochemistry of the Chambishi copper deposit in Zambia are studied. According to the fluid inclusion in quartz and H-O-S isotope characteristics, it is concluded that ore-forming hydrothermal fluid is derived from mantle source and crust source magma mingling, the cause of copper precipitation, sedimentary type sulfur layered mineralization are mainly from diagenetic sulfides and seawater sulfate. Sulfate is mainly reduced by thermochemical method. The hydrothermal vein mineralization of Chambishi copper deposit is closely related to the magmatic activity in the middle Neoproterozoic, and the sedimentary stratified mineralization is mainly related to the large-scale orogeny and regional metamorphism in the late Neoproterozoic.

Geochemistry of pink corundum-bearing feldspathic gneiss, Frenchvale quarry, Cape Breton Island, Canada: metamorphism of albitised, Fe-poor clastic rocks

2019 ◽  
Vol 83 (02) ◽  
pp. 249-260
Author(s):  
J. Victor Owen ◽  
Jacob J. Hanley ◽  
Mitchell J. Kerr ◽  
Matthew Stimson ◽  
Brandon Boucher
Keyword(s):  
Fluid Inclusions ◽  
Quartz Vein ◽  
Isotope Composition ◽  
Regional Metamorphism ◽  
Fluid Phase ◽  
Dolomitic Marble ◽  
Cape Breton Island ◽  
Clastic Rocks ◽  
Silica Alumina ◽  
O Isotope

AbstractFrenchvale quarry, once mined for dolomitic marble, contains pink corundum-bearing, quartz-free/-poor, feldspathic gneiss that is unusually sodic (~7% wt.% Na2O) and iron-poor (~0.6 wt.% Fe2O3), but has silica, alumina and immobile trace-element contents resembling those of suspended fluvial particulate matter (e.g. in the Congo River). The protolith of the gneiss, interpreted as a fine-grained clastic sediment deposited offshore, evidently was albitised prior to deformation and regional metamorphism. Variably-altered gneiss samples show a narrow range of δ18OVSMOW values (8.1 to 10.7‰) and no systematic differences in bulk O isotope composition as a function of alteration intensity. With the exception of an extensively fuchsitised zone adjacent to a thick (1.2 m), cross-cutting quartz vein that contains H2O–NaCl+CO2+CH4-bearing fluid inclusions, the O isotope data do not support interaction of the gneiss with an externally-derived fluid phase except at low fluid:rock ratio, even where granodiorite occurs in direct contact with the gneiss. Fluid inclusions in the quartz vein have bulk $X_{{\rm H}_2{\rm O}}$, $X_{{\rm C}{\rm O}_{\rm 2}}$ and $X_{{\rm C}{\rm H}_{\rm 4}}$ values (in mol.%) of 99.60, 0.14 and 0.26, respectively, as determined by gas chromatography. Although the protolith of the gneiss was associated with carbonate platformal rocks (now marble), corundum is confined to the feldspathic rocks. These feldspathic rocks lack calc-silicate minerals; they are not skarns. As such, they are distinct from well-known Himalayan sapphire and ruby deposits cited previously as analogues of the Frenchvale corundum occurrence.

Characterization of submicrometer fluid Inclusions in minerals by Analytical/Transmission Electron Microscopy and electron diffraction

1990 ◽  
Vol 48 (4) ◽  
pp. 424-424
Author(s):  
George Guthrie ◽  
David Veblen
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Microscope ◽  
Electron Diffraction ◽  
Light Microscopy ◽  
Fluid Inclusions ◽  
Energy Dispersive Spectrometer ◽  
Analytical Transmission Electron Microscopy ◽  
Transmission Electron

The nature of a geologic fluid can often be inferred from fluid-filled cavities (generally <100 μm in size) that are trapped during the growth of a mineral. A variety of techniques enables the fluids and daughter crystals (any solid precipitated from the trapped fluid) to be identified from cavities greater than a few micrometers. Many minerals, however, contain fluid inclusions smaller than a micrometer. Though inclusions this small are difficult or impossible to study by conventional techniques, they are ideally suited for study by analytical/ transmission electron microscopy (A/TEM) and electron diffraction. We have used this technique to study fluid inclusions and daughter crystals in diamond and feldspar.Inclusion-rich samples of diamond and feldspar were ion-thinned to electron transparency and examined with a Philips 420T electron microscope (120 keV) equipped with an EDAX beryllium-windowed energy dispersive spectrometer. Thin edges of the sample were perforated in areas that appeared in light microscopy to be populated densely with inclusions. In a few cases, the perforations were bound polygonal sides to which crystals (structurally and compositionally different from the host mineral) were attached (Figure 1).

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