Introduction: Approaches to dating and duration of fluid flow and fluid-rock interaction

Parnell, John

doi:10.1144/gsl.sp.1998.144.01.01

Cited by 7 publications

(5 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From this surface and the mean fluid flow velocity (10 -4 m.s -1 ) we obtain a fluid flow duration ranging from to 70 000 years. This is consistent with the short time duration of mineralization emplacement estimated for a single magmatic-hydrothermal event (spanning only about 10 000 to 200 000 years) from numerical modeling (Cathles et al, 1997;Chelle-Michou et al, 2017) and radiometric dating (Parnell, 1998).…”

Section: Velocity Analysis and Estimation Of Fluid Flow Duration Durisupporting

confidence: 86%

Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)

Launay

Sizaret

Guillou-Frottier

et al. 2018

Earth and Planetary Science Letters

View full text Add to dashboard Cite

Deciphering the behavior of fluid flow at the magmatic-hydrothermal transition is crucial to understand physical processes leading to the formation of intrusion-related ore deposits and hence to predict the localization of mineralized bodies. However, the hydrodynamics (direction and velocity) of the hydrothermal fluid flow related to this transitional stage remains poorly constrained. Here we present a coupled textural and chemical study performed on tourmaline growth bands to constrain fluid flow during the initiation of the hydrothermal system of the W-Sn-(Cu) Panasqueira deposit. This exceptional deposit consists of a dense network of flat wolframite and cassiterite-bearing quartz veins intensely developed above a well-known hidden greisen cupola. The W-Sn mineralization is preceded by a tourmalinization stage occurring as metasomatic halos around veins and as selvages developed along the vein-wall-rocks contacts. Results emphasize the key role of the greisen cupola on fluid focusing and the role of fluid overpressure during the vein opening. Velocity values highlight an efficient transport of metals in veins largely dominated by advective process (10-4 to 10-3 m.s-1), whereas fluid flow in the altered wall-rocks is slow and pervasive (10-6 to 10-5 m.s-1), suggesting that the element transport through the metasedimentary host rock was low and limited to the alteration haloes. LA-ICP-MS analyses of tourmaline growth bands reveal that fluids coming from the cupola are enriched in Na, K, Li, Sr and Sn, thus emphasizing the contribution of magmatic fluids during the vein formation and the metasomatic alteration of the wall-rocks. More generally, this study demonstrates that the apical portions of granite bodies play as emanative centers of mineralized fluids, and highlights the usefulness of mineral growth band analysis in the search for intrusion-related mineralization.

show abstract

Section: Velocity Analysis and Estimation Of Fluid Flow Duration Durisupporting

confidence: 86%

Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)

Launay

Sizaret

Guillou-Frottier

et al. 2018

Earth and Planetary Science Letters

View full text Add to dashboard Cite

show abstract

“…Flow rate and fracture length were combined to define the initial residence time s, which was calculated by dividing the total initial fracture volume by the initial flow rate. It characterizes the average time a component (e.g., solutes in water) travels through a domain [Parnell, 1998]. In this work, the residence time refers to the flow through the fracture because the fracture permeability is about 3 orders of magnitude higher than that of the matrix in our model and the flow in the matrix is negligible compared to that in the fracture.…”

Section: Sensitivity Analysismentioning

confidence: 99%

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Cao

Karpyn

2015

Water Resources Research

View full text Add to dashboard Cite

Fractures and defects in wellbore cement can lead to increased possibilities of CO 2 leakage from abandoned wells during geological carbon sequestration. To investigate the physicochemical response of defective wellbore cement to CO 2 -rich brine, we carried out a reactive flow-through experiment using an artificially fractured cement sample at a length of 224.8 mm. A brine solution with dissolved CO 2 at a pH of approximately 3.9 was injected through the sample at a constant rate of 0.0083 cm 3 /s. Surface optical profilometry analysis and 3-D X-ray microtomography imaging confirmed fracture closure and selfhealing behavior consistent with the measured permeability decrease. Visual inspection of the reacted fracture surface showed the development of reactive patterns mapping the flow velocity field inside the fracture, as well as restricted flow toward the sample outlet. The postexperiment permeability of the core sample was measured at half of its initial permeability. A reactive transport model was developed with parameters derived from the experiment to further examine property evolution of fractured cement under dynamic flow of CO 2 -rich brine. Sensitivity analysis showed that residence time and the size of initial fracture aperture are the key factors controlling the tendency to self-healing or fracture opening behavior and therefore determine the long-term integrity of the wellbore cement. Longer residence time and small apertures promote mineral precipitation, fracture closure, and therefore flow restriction. This work also suggests a narrow threshold separating the fracture opening and self-sealing behavior.

show abstract

“…The location and timing of fluid flow in sedimentary basins is typically constrained by basin models based on thermal maturation modelling integrated with geochemical data obtained from boreholes (e.g. Parnell, 1998; Johannesen et al. , 2002; Kubala et al.…”

Section: Introductionmentioning

confidence: 99%

Temporal constraints on the growth and decay of large‐scale mobilized mud masses and implications for fluid flow mapping in sedimentary basins

Jackson

Stoddart

2005

Terra Nova

View full text Add to dashboard Cite

Seismic‐stratigraphic analysis of the Cretaceous to succession of the Uer Terrace, North Sea seabed Basin, Norway, demonstrates that the Upper Oligocene succession has undergone large‐scale mobilization of mudstone‐dominated units due to the upward migration of water and associated hydrocarbons into the interval, which is in some way linked to a period of gas expulsion from adjacent deep basins. Seismic‐stratigraphic analysis of units overlying the mobilized zones indicates they created positive seafloor topography during the Late Miocene implying gaseous fluids were expelled at the seabed. Loading by the overlying Pliocene succession caused the mobilized mud masses to deflate and resulted in the formation of low‐relief, fault‐bounded craters. The results of this study have implications for understanding the location and timing of fluid flow in sedimentary basins.

show abstract

Introduction: Approaches to dating and duration of fluid flow and fluid-rock interaction

Cited by 7 publications

References 46 publications

Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)

Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Temporal constraints on the growth and decay of large‐scale mobilized mud masses and implications for fluid flow mapping in sedimentary basins

Contact Info

Product

Resources

About

Introduction: Approaches to dating and duration of fluid flow and fluid-rock interaction

Cited by 7 publications

References 46 publications

Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)

Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)

Self‐healing of cement fractures under dynamic flow of CO2‐rich brine

Temporal constraints on the growth and decay of large‐scale mobilized mud masses and implications for fluid flow mapping in sedimentary basins

Contact Info

Product

Resources

About

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine