Fluid inclusions petrography and genetic interpretation of. Fias may be composed of primary inclusions trapped during precipitation of the host phase, or may contain secondary. Fluid inclusions record thermal and fluid evolution in. Fluid and source magma evolution of the questa porphyry mo deposit, new mexico, usa leonhard m. The first step is typically at large scale core or outcrop, gathering samples for finer work to achieve the crosscutting and stratigraphic relationships.
The difference between standard thin section petrography and fluid inclusion petrography is that each of these mechanical steps must be carriedout with great care. Although, the reliability of fluid inclusion studies may appear doubtful because of the relatively high reactivity and the volatile character of fluids, it has been shown that fluid inclusions may preserve fluids over millions of years, which remain representative of original near surface, crustal or mantle conditions. The combination of detailed fluid inclusion petrography and scanning electron microscope sem cathodoluminescence imaging has allowed us to relate individual fluid inclusion assemblages, that is, the most finely discriminated groups of petrographically associated fluid inclusions, to specific growth zones of authigenic quartz, establishing the. Petrography, fluidinclusion, isotope, and traceelement. The organic petrography service delivers information about source rock type and associated organic matter, thermal maturity level, and the hydrocarbon generation zone. Ideally, a fluid inclusion study should be integrated in petrology, including rock and mineral analysis, and can be.
In petroleum systems, fluid inclusion data have been widely used to define hydrocarbon migration and charge histories, especially where there is a complex petroleum charge history e. Oct 12, 2018 what are fluid inclusions and why might you want to analyse them. The general properties of fluid inclusions in hydrothermal oreforming systems are considered and the interpretation of these data in terms of fluid evolution processes is discussed. The past decade has revealed significant advantages to using fluid inclusions as a means of understanding the physical and chemical history of fluids in sedimentary basins, but it also has revealed important limitations which have required that a new approach must be employed to effectively use fluid inclusions. Fit is a petroleum industry service company specializing in chemical evaluation of micronsized trapped fluid samples in rock material and analysis of entrained volatiles in drilling fluids mud gas with direct quadrapole mass spectrometry. Fluid inclusions in mudrocks houston geological society. Petrography, fluid inclusion analysis, and geochronology.
Fluid inclusion petrography systematics of fluid inclusions in. A fluid inclusion is a microscopic bubble of liquid and gas that is trapped within a crystal. Fluid inclusion microthermometry pore scale solutions. All the fluid inclusions were investigated following the approach of using fluid inclusion assemblages fias, criteria of goldstein and reynolds 48. More detailed fluid inclusion studies on the breccias could not be carried out because when the quartz was viewed in. Fluid and source magma evolution of the questa porphyry mo. Microthermometry and fluid inclusion petrography overview. The textural relationship between fluid inclusions and the host rock is the subject of fluid petrography, an essential part of any rock study and an important issue in this course. Comparison of fluid processes in coexisting wolframite and.
Fluid inclusions in fluid inclusions in diagenetic mineralsdiagenetic minerals isbn 1565750980, cd catalog 61031 originally published in cd as sepm short course no. A procedure of fluid inclusion studies is proposed with emphasis on the criteria of selecting fluid inclusions for detailed microthermometry and spectroscopic analysis. Petrographic analysis of fluid inclusions robert h. Systematics of systematics of fluid inclusions in fluid. Petrography, fluid inclusion and isotope studies in ordovician carbonate reservoirs in the shunnan area, tarim basin, nw china. Implications for the nature and timing of silicification. Petrography, fluid inclusion, isotope, and traceelement constraints on the origin of quartz cementation and feldspar dissolution and the associated fluid evolution in arkosic sandstones guanghui yuan, 1 yingchang cao, 2 jon gluyas, 3 xu cao, 4 and wenbo zhang 5. In this study, we present data from fluid inclusion petrography and microthermometry of. Drilling fluids do not affect the analysis, and there is no shelf life for samples. Mineralization of luziyuan pbzn skarn deposit, baoshan, yunnan province, sw china.
The sulfides and sulfosalts in the distal veins formed in three distinct stages. Mineral textures and fluid inclusion petrography of the. Bgs has a long history of fluid inclusion research. The use of integrated fluid inclusion studies for constraining. View academics in fluid inclusion petrography on academia.
Fluid inclusion petrography performed on thick, polished sections of rock material under transmitted planepolarized light and episcopic illumination with a highintensity uv source, fluid inclusion petrographic analysis provides microscopic examination of rock material for trapped hydrocarbons and aqueous fluids. Traditionally, empirical analysis has been preferred in fluid inclusion studies. Among the most diagnostic criteria for a primary origin. Petrographic textures show that these fluid inclusions were trapped from warm brines in which the halite formed. Pdf a procedure of fluid inclusion studies is proposed with emphasis on the criteria of selecting fluid inclusions for detailed. A proper interpretation of fluid inclusions can be made only when textural relationships between fluid inclusions and the host mineral are considered. Fluid inclusion petrography and vein mineral textures indicative of boiling have been characterized in 855 samples from epithermal precious metals deposits along the veta madre at guanajuato, mexico. We combine structural analysis, fluid inclusion, and mineral chemistry data from synkinematic and authigenic minerals to reconstruct the temporal variations in fluid pressure p f, temperature t, and bulk composition x of the fluids that mediated deformation and steered strain localization along bfz300, a strikeslip fault originally. This chapter presents the results of a detailed fluid inclusion study of the paragenetic stages within the federalbassett fault at renison. Edwin roedder, who assembled the encyclopedic work after more than thirty years study of fluid inclusions in minerals, is eminently qualified for the undertaking.
Pdf fluid inclusion petrography and microthermometry of. Pdf petrographic analysis of fluid inclusions researchgate. Mar 23, 2017 combined sulfide and sulfosalt geothermometry and fluid inclusion analyses indicate that the early stage of mineralization occurred at a temperature of 400 c and involved boiling under hydrostatic pressure 200 bar, with the temperature of the system dropping during the late stage to 200 c. Aqueous fluid inclusion distribution, abundance and attributes of encapsulated fluids temperature, salinity, api gravity evidence for petroleum migration and paleoaccumulations basin model calibration saturation state. Representative photomicrographs of fluid inclusions hosted in quartz of different hydrothermal stages.
What are fluid inclusions and what are the mechanisms of their entrapment. However, the validity of fluid inclusion data reported in these studies were not constrained with the fluid inclusion petrography studies goldstein and reynolds, 1994, casting doubt on their validity as a hydrothermal indicator. Pdf fluid inclusion petrography ulrich hein academia. Mineralization of luziyuan pbzn skarn deposit, baoshan. Optimal interpretation of microthermometrical data from fluid. Mineral textures and fluid inclusion petrography of the epithermal agau deposits at guanajuato, mexico. Type a fluid inclusions are aqueouscarbonic, rounded to irregular in shape, around 510 m in size and occur as clusters only in the ocelli and fluid pockets of the mattoni gabbro. Fluid inclusion petrography quartz and sphalerite samples were initially examined but because the fluid inclusion population in sphalerite samples was far too low for any meaningful study, the work was restricted to samples of quartz. Panel 2 fluid inclusion stratigraphy discussion, walnut cove formation, dan river basin, nc. Yellowood ave broken arrow, ok 74012 usa deliverable.
Each fluid inclusion forms a selfcontained geothermometer which potentially records a subsurface temperature at some time in the geologic past. Fluid inclusions are fluidfilled vacuoles sealed within minerals. The shizhuyuan polymetallic deposit is located in the central part of the nanling region, southeastern china, and consists of proximal wsnmobi skarns and greisens and distal pbznag veins. Therefore, the significance of melting temperatures, homogenisation temperatures and other measurable phase changes is not well understood. Table 21 lists the various morphological and petrographic criteria that have been used to determine the origin of fluid inclusions. Welcome to todays lecture on fluid inclusions in minerals and this is a concluding part of the second module of the lecture series. Interpretations of thermal maturity level and hydrocarbon generation zone are based on the reflectance measurements and overall observations. Fluid evolution of the monte mattoni mafic complex, adamello. Photomicrographs of the fluid inclusion types present within the monte mattoni mafic complex. Fluid inclusion and ore microscopypetrography laboratory. To better understand the fluid processes forming these two minerals, freegrown crystals of intergrown wolframite and quartz from the giant.
In this study, we present data from fluid inclusion petrography and microthermometry of petroleum, gasbearing, and aqueous inclusions in. May 01, 2018 petrography, fluid inclusion, isotope, and traceelement constraints on the origin of quartz cementation and feldspar dissolution and the associated fluid evolution in arkosic sandstones. This chapter presents practical methodologies for examining the petrographic characteristics of fluid inclusions in diagenetic minerals. However, owing to the paucity of detailed petrography, previous fluid inclusion studies on coexisting wolframite and quartz are associated with a certain degree of ambiguity. Deepburial hydrothermal alteration of the presalt carbonate reservoirs from northern campos basin, offshore brazil. A summary of fluid inclusion data from a variety of hydrothermal deposit types is presented to illustrate some. Fluid inclusions petrography and genetic interpretation.
This book has been written mainly to help the newcomer in fluid inclusion work learn how to use fluid inclusions and to avoid many of the pitfalls and blind alleys that beset anyone starting in a new field of research. By determining the homogenization temperatures of different inclusion populations within a sample that is, the temperatures at which the inclusions. Petroleum and aqueous inclusion populations are identified along with relevant variables, such as fluorescence color. Confirmation of hydrocarbon shows and helium in the walnut. Fluid inclusion petrography and microthermometry of zn and. Fluid inclusion petrography and microthermometry of zn and pb. As minerals often form from a liquid or aqueous medium, tiny blebs of that liquid can become trapped within the crystal, or along healed crystal fractures. Goldstein university of kansas department of geology 1475 jayhawk blvd. In addition, fluid inclusion petrography and laser raman spectrometry show the presence of abundant daughter minerals chalcopyrite, molybdenite, hematite, halite, calcite, and anhydrite in s 1type fis of the prograde skarn stage and the oreforming fluid has no co 2 content in the fuzishan deposit. Two hydrothermal centers are known from previous work. Petrographic microscopy of a rock sample is the first and at the same time essential step of any fluid inclusion study.
An fia represents a group of fluid inclusions that were all trapped at the same time goldstein and reynolds, 1994. Purchase of an open document does not constitute license for republication in any form, nor does it allow web posting without prior written permission. Trace element data of the late cretaceous intrusive rocks. Fluid evolution of fuzishan skarn cumo deposit from the. Petrography, fluid inclusion, isotope, and traceelement constraints on the origin of quartz cementation and feldspar dissolution and the associated fluid evolution in arkosic sandstones. This chapter presents practical methodologies for examining the petrographic characteristics of fluid inclusions in diagenetic minerals, together with a format for. Fluid inclusion and ore microscopy petrography laboratory.
A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Pdf mineral textures and fluid inclusion petrography of. A fluid inclusion petrography and microthermometry report contains the results of optical evaluation and photodocumentation of each thin section, collection of temp erature, api gravity and salinity data, where possible, and interpretation of all data. Offering laboratory analysis of trapped pore fluids, and real time chemical profiling of mud gas at well site.
We were involved in the development of equipment used to undertake microthermometry, pioneered techniques for the isotopic and elemental analysis fluid inclusions and helped develop numerical models of phase equilibria for the interpretation of fluid inclusion microthermometric data. Petrofecta automated trapped fluid and elemental composition analysis. Petrography, fluid inclusion and isotope studies in. Fluid inclusion petrography and microthermometry fluid inclusions contain information that can be translated to temperature, pressure and compositional constraints. Fluid inclusion petrography iit kharagpur july 2018. Using a combination of microscopy techniques, and specialised equiment to measure the temperatures at which the trapped fluids undergo various phase changes, we can derive information about the temperature and pressure conditions, as well as continue reading. Fluid inclusions in sedimentary and diagenetic systems. The fluid inclusion data are consistent with a genetic link of mineralization with basinal brines derived from the thelon basin. Goldstein and others published petrographic analysis of fluid inclusions find, read and cite all the research you need on. Systematics of fluid inclusions in diagenetic minerals.
The elatsite porphyry copper deposit occurs in an islandarc setting hosted by late cretaceous monzoniticmonzodioritic porphyry stocks which were emplaced into precambriancambrian phyllites. Optimal interpretation of microthermometrical data from. Custom fluid databases fluid inclusion petrography and microthermometry are applicable to any lithology and any age reservoir, provided that suitable fluid inclusion populations can be found. The infinite number of compositional combinations in fluids makes the. Regional geological map of myanmar showing the principal tectonic units 4. Degassing hydrocarbons soc01a15 supported by fis fluid inclusion petrography from soc0115 and 01a.
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