Biological and diagenetic influence in Recent and fossil tufa deposits from Belgium

Janssen, An; Swennen, Rudy; Podoor, Nicole; Keppens, Eddy

doi:10.1016/s0037-0738(99)00033-0

Cited by 127 publications

(110 citation statements)

References 18 publications

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“…4D) (Wright et al, 1997;Janssen et al, 1999;Arp et al, 2001;Davaud and Girardclos, 2001;Rainey and Jones, 2007). In their 'neomorphic sequences', Freytet and Verrecchia (1998) and Freytet and Verrecchia (1999), building on previous work by Love and Chafetz (1988), showed a sequence of steps in recrystallization of calcitic, micritic and sparitic envelopes of pro-and eukaryotic filaments.…”

Section: Neomorphismmentioning

confidence: 93%

“…Several authors also suggest that any biological inclusions present in the active deposits gradually vanish during the formation of continuous, dense calcite crusts (Janssen et al, 1999;Arp et al, 2001;Peng and Jones, 2013). (Aggrading) neomorphism is therefore commonly inferred -rightly or wrongly -where rocks exhibit calcitic, coarsely crystalline mosaic fabrics, often consisting of anhedral-subhedral equant (sparry) calcite (Rainey and Jones, 2007), or columnar calcite crystals (Love and Chafetz, 1988) or radial palisade calcite with sweeping extinction (Freytet and Verrecchia, 1999;Pache et al, 2001;Golubić et al, 2008).…”

Section: Neomorphismmentioning

confidence: 99%

“…Apparent lack of isotope signal alteration does not necessarily indicate lack of diagenesis, but rather shows that isotopes may not be diagnostic . In their study of Recent precipitates and paleo-riverine tufa deposits, Janssen et al (1999) 1.5‰ V-PDB for δ 13 C). Here we can consider that if early diagenesis is always completed in a short time span, compared to the time scale of interest for paleoenvironmental reconstructions (decadal, centennial, millennial), then isotope geochemical signals preserved in the diagenetic fabric could still be an acceptable reflection of the original depositional conditions (c.f.…”

mentioning

confidence: 99%

“…The result of early diagenetic processes like replacement, neomorphism, cementation and micritisation, is that initial mineralogies and textures can become quickly (syn-depositionally) overprinted, resulting in a secondary fabric that can be difficult to distinguish from a primary texture, though attempts have been made in the case of particular deposits such as speleothems (Frisia, 2015). For example, crystalline dendrite or banded crystalline fan dendritic cementstone fabrics (Della Porta, 2015) have been observed as primary precipitates (Gradzinski, 2010;Gandin and Capezzuoli, 2014;Brasier et al, 2015), but could also result from early diagenesis of 'boundstone' fabrics (sensu Della Porta, 2015), like micrite boundstone or micrite/ microsparite boundstone and prismatic crystal fans with entombed microorganisms (Freytet and Verrecchia, 1999;Janssen et al, 1999;Arp et al, 2010;Gradzinski, 2010). It is therefore clear that sparry, equant or columnar calcitic crust fabrics do not unequivocally point to a diagenetic origin.…”

mentioning

confidence: 99%

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What do we really know about early diagenesis of non-marine carbonates?

Boever

Brasier

Foubert

et al. 2017

Sedimentary Geology

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Non-marine carbonate rocks including cave, spring, stream, calcrete and lacustrine-palustrine sediments, are susceptible to early diagenetic processes. These can profoundly alter the carbonate fabric and affect paleoclimatic proxies. This review integrates recent insights into diagenesis of non-marine carbonates and in particular the variety of early diagenetic processes, and presents a conceptual framework to address them. With ability to study at smaller and smaller scales, down to nanometers, one can now observe diagenesis taking place the moment initial precipitates have formed, and continuing thereafter. Diagenesis may affect whole rocks, but it typically starts in nano-and micro-environments. The potential for diagenetic alteration depends on the reactivity of the initial precipitate, commonly being metastable phases like vaterite, Ca-oxalates, hydrous Mg-carbonates and aragonite with regard to the ambient fluid. Furthermore, organic compounds commonly play a crucial role in hosting these early transformations. Processes like neomorphism (inversion and recrystallization), cementation and replacement generally result in an overall coarsening of the fabric and homogenization of the wide range of complex, primary microtextures. If early diagenetic modifications are completed in a short time span compared to the (annual to millennial) time scale of interest, then recorded paleoenvironmental signals and trends could still acceptably reflect original, depositional conditions. However, even compact, non-marine carbonate deposits may behave locally and temporarily as open systems to crystal-fluid exchange and overprinting of one or more geochemical proxies is not unexpected. Looking to the future, relatively few studies have examined the behaviour of promising geochemical records, such as clumped isotope thermometry and (non-conventional) stable isotopes, in well-constrained diagenetic settings. Ongoing and future in-vitro and in-situ experimental approaches will help to investigate and detangle sequences of intermediate, diagenetic products, processes and controls, and to quantify rates of early diagenesis, bridging a gap between nanoscale, molecular lab studies and the fossil field rock record of non-marine carbonates.

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Section: Neomorphismmentioning

confidence: 93%

Section: Neomorphismmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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What do we really know about early diagenesis of non-marine carbonates?

Boever

Brasier

Foubert

et al. 2017

Sedimentary Geology

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“…The in cli na tion of some of the stromatolitic beds studied sug gests they lit tered steep stream-beds, in di cat ing the latter. This is sup ported by the com mon oc cur rence of lar val housings within stromatolites since anal o gous lar val hous ings have been: (1) found in many re cent tufas which orig i nate in fast-flowing wa ter set tings (Drys dale, 1999;Janssen et al, 1999;Šemnièki et al, 2012), in clud ing the Háj Val ley (Gradziñski, 2010), and (2) are rec og nized in high-en ergy fos sil tufas, es pecially in warm cli mate zones .…”

Section: Moss Tufamentioning

confidence: 99%

Holocene tufa in the Slovak Karst: facies, sedimentary environments and depositional history

Gradziński

Hercman

Jaśkiewicz

et al. 2013

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Sev eral tufa com plexes are known in the Slo vak Karst which is a typ i cal karst area of a tem per ate cli mate. This area is built of Me so zoic car bon ates, mainly Tri as sic in age. The karst sys tems drain car bon ate pla teaux and lead wa ter to resurgences located in val leys which are up to 300 m deep. Be low the resurgences there are Ho lo cene fos sil tufa de pos its that ex ceed 12 m in thick ness. The tufas in clude stromatolite, moss, phytoclastic, oncoidal, and intraclastic fa cies. Ex ten sive bar rages which once dammed the up per reaches of the streams were formed in nar row val leys. They are com posed pre dom i nantly of moss fa cies and stromatolites, with sub or di nate oncoidal and phytoclastic fa cies. Phytoclastic, oncoidal and intraclastic fa cies are dom i nant in dammed seg ments of streams, and in clude gas tro pod shells and char coal frag ments. Some small moss cushions are also de vel oped. Bar rages and dammed ar eas formed in a lon gi tu di nal flu vial depositional sys tem. Con versely, below resurgences lo cated on pla teau slopes tufas of a perched springline depositional sys tem were formed. These com prise de pos its of prograding cas cades con structed by moss, phytoclastic and stromatolitic fa cies. Pres ently, the tufas ana lysed are in ac tive. They stopped grow ing in the Late Ho lo cene time, af ter which there was abrupt in ci sion of the streams. This caused downcutting into Ho lo cene tufas, in some places reach ing Me so zoic bed rock. At pres ent tufa is be ing pre cip i tated from streams in all the sites stud ied.Key words: flu vial tufa, perched spingline tufa, ra dio car bon dat ing, Qua ter nary, Late Ho lo cene tufa de cline, Cen tral Carpathians.

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Tufa and Travertine

Viles¹,

Pentecost²

2007

Geochemical Sediments and Landscapes

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Biological and diagenetic influence in Recent and fossil tufa deposits from Belgium

Cited by 127 publications

References 18 publications

What do we really know about early diagenesis of non-marine carbonates?

What do we really know about early diagenesis of non-marine carbonates?

Holocene tufa in the Slovak Karst: facies, sedimentary environments and depositional history

Tufa and Travertine

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