Mesozoic hydrothermal impact on Rotliegende and Bunter immature sandstones of the High Rhine trough and its adjacent eastern area (southern Black Forest, Germany)

Brockamp, Olaf; Schlegel, Andreas; Clauer, Norbert

doi:10.1016/j.sedgeo.2010.12.001

Cited by 21 publications

(9 citation statements)

References 24 publications

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“…The minimum principal stress σ3 is estimated to be horizontal and oriented WNW-ESE (Schumacher, 2002;Derer et al, 2005), with subsidence in the URG Basin, and uplift and erosion on the Graben shoulders (Timar-Geng et al, 2006;Dresmann et al, 2010;Brockamp et al, 2011). During Late Oligocene, the regional stress field evolved towards a σ3 oriented NE-SW, accompanied by sinistral shearing displacement along the major faults oriented NS.…”

Section: 11regional Geologymentioning

confidence: 98%

Pore network properties of sandstones in a fault damage zone

Bossennec

Géraud

Moretti³

et al. 2018

Journal of Structural Geology

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The understanding of fluid flow in faulted sandstones is based on a wide range of techniques. These depend on the multi-method determination of petrological and structural features, porous network properties and both spatial and temporal variations and interactions of these features. The question of the multi-parameter analysis on fluid flow controlling properties is addressed for an outcrop damage zone in the hanging wall of a normal fault zone on the western border of the Upper Rhine Graben, affecting the Buntsandstein Group (Early Triassic). Diagenetic processes may alter the original pore type and geometry in fractured and faulted sandstones. Therefore, these may control the ultimate porosity and permeability of the damage zone. The classical model of evolution of hydraulic properties with distance from the major fault core is nuanced here. The hydraulic behavior of the rock media is better described by a pluriscale model including: 1) The grain scale, where the hydraulic properties are controlled by sedimentary features, the distance from the fracture, and the impact of diagenetic processes. These result in the ultimate porous network characteristics observed. 2) A larger scale, where the structural position and characteristics (density, connectivity) of the fracture corridors are strongly correlated with both geo-mechanical and hydraulic properties within the damage zone.

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Section: 11regional Geologymentioning

confidence: 98%

Pore network properties of sandstones in a fault damage zone

Bossennec

Géraud

Moretti³

et al. 2018

Journal of Structural Geology

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“…Illitization is largely controlled by the K content of the host-rock pore waters, and was probably favored by rather low pHs in the sandstones (Lanson et al, 2002). It is often reported as resulting from either progressive K-fixation in a smectite-to-illite trend (e.g., Inoue et al, 1987), or as a direct mineral precipitation associated with concomitant alteration/dissolution of detrital K-bearing feldspar and micas (e.g., Schlegel et al, 2007;Brockamp et al, 2011). Systematic decrease of K-Ar dates with decreasing micrometric size fractions of clay-rich material has been often reported (e.g., Zwingmann et al, 1999;Cathelineau et al, 2004;Sant'Anna et al, 2006), the older ages of the coarser size fractions being generally considered as reflecting contribution of detrital minerals that accumulated more radiogenic argon.…”

Section: Significance Of the Illite K-ar Agesmentioning

confidence: 99%

Reconstructing fluid-flow events in Lower-Triassic sandstones of the eastern Paris Basin by elemental tracing and isotopic dating of nanometric illite crystals

Blaise

Clauer

Cathelineau

et al. 2016

Geochimica et Cosmochimica Acta

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International audienceLower- to Middle-Triassic sandstones from eastern Paris Basin were buried to a maximum depth of 2500 m at a paleo-temperature of about 100 °C. They contain extensive amounts of authigenic platy and filamentous illite particles similar to those reported in reservoirs generally buried at 3000 to 5000 m and subjected to temperatures of 120 to 150 °C. To evaluate this unexpected occurrence, such sandstones were collected from drill cores between 1825 and 2000 m depth, and nanometric-sized sub-fractions were separated. The illite crystals were identified by XRD, observed by SEM and TEM, analyzed for their major, trace, rare-earth elements and oxygen isotope compositions, and dated by K-Ar and Rb-Sr.Illite particles display varied growth features in the rock pore space and on authigenic quartz and adularia that they postdate. TEM-EDS crystal-chemical in situ data show that the illite lath/fiber and platelet morphologies correspond at least to two populations with varied interlayer charges: between 0.7 and 0.9 in the former and between 0.8 and 1.0 in the latter, the Fe/Fe+Mg ratio being higher in the platelets. Except for the deeper conglomerate, the PAAS-normalized REE patterns of the illite crystals are bell-shaped, enriched in middle REEs. Ca-carbonates and Ca-phosphates were detected together with illite in the separates. These soluble components yield 87Sr/86Sr ratios that are not strictly in chemical equilibrium with the illite crystals, suggesting successive fluids flows with different chemical compositions. The K-Ar data of finer <0.05 μm illite separates confirm two crystallization events at 179.4 ± 4.5 and 149.4 ± 2.5 Ma during the Early and Late Jurassic. The slightly coarser fractions contain also earlier crystallized or detrital K-bearing minerals characterized by lower δ18O values. The δ18O of the finest authigenic illite separates tends to decrease slightly with depth, from 18.2 (± 0.2) to 16.3 (± 0.2) ‰, suggesting different but contemporaneous crystallization conditions deeper in the section.The illite platelets and filaments crystallized in changing physical-chemical crystallization conditions induced by fluids flows through the host-rock pore system. These flow events were probably driven by repetitive rifting episodes of the North Atlantic Ocean, although located several hundreds kilometers away from eastern Paris Basin, and/or by fracturing events in the nearby basement of the Vosges Massif. Complex relationships between geodynamical events, thermal anomalies, and advective fluids confirm that remote tectonic activities can impact quiescent basins, even if located far from tectono-thermal activities, by discrete and long-distance fluid flows

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“…Evidence of increased tectonic and hydrothermal activity in the Tethyan realm during the Jurassic and Early Cretaceous periods, related to the opening of atlantic realm and spreading of the alpine Tethys (and related mineralization), was mentioned in numerous studies performed on base-metal mineralization and/or carbonate diagenesis/ cement stratigraphy in Europe and northern africa (e.g., Bonhomme et al 1983;Zeeh et al 1997;Kappler and Zeeh 2000;Heijlen et al 2001Heijlen et al , 2003Kuhlemann et al 2001;Makhoukhi et al 2003;Muchez et al 2005;Pfaff et al 2009;Romer et al 2010;Brockamp et al 2011). However, mineralization in the Jura Mountains (and associated high concentrations of Zn and Cd in carbonate rocks) was found only in rocks of Triassic-late Jurassic age.…”

Section: Timing Of Sphalerite Precipitation and Mesozoic Tectonic Actmentioning

confidence: 99%

“…abundant mineralizations in exposed basement rocks in the southern Black Forest region (SW Germany) indicate the influence of multiple phases of intensified hydrothermal activity related to the reactivation of basement structures during the Mesozoic and Cenozoic (Bonhomme et al 1983;Pfaff et al 2009;Romer et al 2010;Brockamp et al 2011). These hydrothermal episodes may have affected a larger area in Europe, but very little is known about its expression in the adjacent area of the northern and western Swiss Jura Mountains, directly to the south of the Black Forest crystalline massif (Fig.…”

Section: Introductionmentioning

confidence: 99%

Formation and age of sphalerite mineralization in carbonate rocks of Bajocian age in the Swiss Jura Mountains: evidence of Mesozoic hydrothermal activity

Efimenko

Schneider

Spangenberg

et al. 2014

Int J Earth Sci (Geol Rundsch)

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A combination of petrographic and geochemi- cal techniques was applied to better constrain the origin and evolution of the fluid systems responsible for the for- mation of disseminated, Cd-rich (up to 0.6 wt%), sphal- erite (ZnS) mineralization in the northeastern part of the Jura Mountains, Switzerland. The Rb–Sr ages of sphalerite samples indicate that a main phase of sphalerite formation occurred near the boundary between the late Middle and early late Jurassic, at around 162 Ma. The negative δ34S values (−22.3 to −5.3 ‰) suggest that biogenic sulfide sul- fur was involved in ZnS precipitation. The strontium iso- tope composition is more radiogenic than that of contempo- raneous seawater, reflecting the interaction of mineralizing fluids with silicate rocks. lead isotope signatures are very uniform (206Pb/204Pb = 18.63–18.67, 207Pb/204Pb = 15.63– 15.64, 208Pb/204Pb = 38.51–38.63), indicating an iso- topically well-homogenized fluid system. The basement rocks underlying the Jurassic strata are considered to be the main source of metals for the sphalerite mineraliza- tion. The migration of deep-sourced hydrothermal saline metal-bearing fluids into the Bajocian host carbonates containing sedimentary reduced sulfur resulted in the pre- cipitation of sulfides. The period of sphalerite formation near the Middle–late Jurassic boundary is characterized by enhanced tectonic and hydrothermal activity in Europe, related to the opening of the Central atlantic and tectonic/ thermal subsidence during spreading of the alpine Tethys. Our study provides evidence that the Bajocian carbonate rocks in the Jura Mountains area were affected by the cir- culation of deep-sourced metal-bearing hydrothermal fluids in response to these continent-wide tectonothermal events. The presence of sphalerite mineralization and associated geochemical anomalies in Zn and Cd contents in carbonate rocks may also be used to trace basement features

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Mesozoic hydrothermal impact on Rotliegende and Bunter immature sandstones of the High Rhine trough and its adjacent eastern area (southern Black Forest, Germany)

Cited by 21 publications

References 24 publications

Pore network properties of sandstones in a fault damage zone

Pore network properties of sandstones in a fault damage zone

Reconstructing fluid-flow events in Lower-Triassic sandstones of the eastern Paris Basin by elemental tracing and isotopic dating of nanometric illite crystals

Formation and age of sphalerite mineralization in carbonate rocks of Bajocian age in the Swiss Jura Mountains: evidence of Mesozoic hydrothermal activity

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