Fractionation between TiO2 and Zr as a measure of sorting within shale and sandstone series (Northern Portugal)

García, Daniel; Coelho, João d’Oliveira; Perrin, M.

doi:10.1127/ejm/3/2/0401

Cited by 109 publications

(47 citation statements)

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“…It is confirmed by the ternary diagram 10×Al 2 O 3 -Zr-200×TiO 2 (Fig. 10) illustrating the sortingrelated fractionations (Garcia et al 1991). The Chełmski sections display more distal facies of turbidites.…”

Section: Discussionsupporting

confidence: 60%

“…Ternary diagram plotting 10 × Al 2 O 3 -Zr-200 ×TiO 2 (Fig. 10) illustrates the presence of sorting-related fractionations (Garcia et al 1991). Zircon is a carrier mineral for Zr and HREE plus Y, thus HREE and Y often co-vary with Zr.…”

Section: Interpretation Source Rocks and Sedimentary Processesmentioning

confidence: 99%

“…Rutile could have been attributed to TiO 2 contents if titanium had not been easily incorporated by phyllosilicates. A ternary plot of 10 × Al 2 O 3 -Zr-200 × TiO 2 (Garcia et al 1991) shows an accumulation of Zr or TiO 2 due to detritus recycling. The Zr/Sc vs. Th/Sc diagram (McLennan et al…”

Section: G G G G Geol Eol Eolmentioning

confidence: 99%

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Source areas of the Grybów sub-basin: micropaleontological, mineralogical and geochemical provenance analysis (Outer Western Carpathians, Poland)

Oszczypko-Clowes¹,

Wójcik-Tabol²,

Płoszaj³

2015

Geologica Carpathica

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Abstract:The Grybów Unit occurring in the Ropa tectonic window was the subject of micropaleontological and geochemical investigation. Studies, based on calcareous nannofossils, proved that the level of reworked microfossil is not higher than 22 % and it varies between two sections. Quantitative analyses of the reworked assemblages confirmed the domination of Cretaceous and Middle Eocene species. The Sub-Grybów Beds, Grybów Marl Formation and Krosno Beds were assigned to the Late Oligocene and represent the terminal flysch facies. Detrital material accumulated in the Oligocene sediments originated from the Marmarosh Massif, which is the eastern prolongation of the Fore-Magura Ridge

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Section: Discussionsupporting

confidence: 60%

Section: Interpretation Source Rocks and Sedimentary Processesmentioning

confidence: 99%

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Source areas of the Grybów sub-basin: micropaleontological, mineralogical and geochemical provenance analysis (Outer Western Carpathians, Poland)

Oszczypko-Clowes¹,

Wójcik-Tabol²,

Płoszaj³

2015

Geologica Carpathica

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“…However, the variable content of inert elements in mudstone is mostly due to the weathering degree, which affects parent rocks. Ternary plots based on Al 2 O 3 , TiO 2 , and Zr eliminate the weathering effects and may illustrate the presence of sorting-related fractionations which are recognizable by simple mixing trends on a ternary Al 2 O 3 -TiO 2 -Zr diagram (Garcia et al, 1991). In our case a mixing trend, mostly characterized by changes in the Al 2 O 3 /Zr ratio, which could be due to a recycling effect, is clearly envisaged (Fig.…”

Section: Sorting and Recyclingmentioning

confidence: 84%

Sedimentary recycling, provenance and paleoweathering from chemistry and mineralogy of Mesozoic continental redbed mudrocks, Peloritani mountains, southern Italy

et al. 2006

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The Triassic to Lowermost Jurassic mudrocks from continental redbeds of the Longi-Taormina Unit (Calabria-Peloritani Arc; southern Italy) have been mineralogically, chemically and petrographically analyzed, in order to reveal their complex history, which record an important phase of the geological evolution of the Mediterranean area.The Late Triassic corresponds with a low first-order sea level stand and a time of high continental emergence whereas the Early Jurassic was the time of the initiation of the first-order sea level rise in the mid-Mesozoic, generally marked by a transgressive trend.The mineralogical assemblage, dominated by the occurrence of illite and illite/smectite mixed layers, coupled to the CIA index and to the A-CN-K plot, indicates post-depositional K-enrichments.Palaeoweathering indices (CIW and PIA ratios) suggest that the source experienced intense weathering and that they likely record a recycling effect from their metasedimentary basement rocks. A recycling effect is also suggested by the distribution of Al 2 O 3 , TiO 2 , and Zr. In the Zr/Sc vs. the Th/Sc plot the redbeds are not clustered along the primary compositional trend but fall along a trend involving zircon addition and thus sediment recycling. Recycling could significantly affect the weathering indices which likely monitor a cumulative effect including a first cycle of weathering at the source rocks. Weathering occurred under hot, episodically humid climate with a prolonged dry season. Wet-humid conditions favored the formation of stream channels that eroded the soil profiles, whereas the dry season promoted the sedimentation. The climate alternation in the Early Jurassic favored recycling.An additional provenance terrane occurring in the basement, including metavolcanic rocks having mafic composition cannot be excluded, since the Eu anomaly is slightly higher than the PAAS value. Although the effects of recycling on REE distribution are uncertain, the Eu/Eu* should increase, as more feldspar is destroyed during weathering and diagenesis. This involves that the Eu/Eu* ratio could monitor a supply of low Eu/Eu* mafic detritus which compensate for the recycling effect by reducing Eu/Eu*. Eu released during the dissolution of feldspar could be retained by clay minerals contributing to minimize the recycling induced increase of the Eu-anomaly. This may involve that the recycling effect on the Euanomaly was minor and that the low Eu/Eu* mafic detritus supply was also minor. The subordinate importance of a mafic supply is confirmed also by other provenance proxies including the La-Th-Sc plot and the Cr/V and Y/Ni ratios.The proportions of illitic layers in I/S mixed layers coupled with the illite crystallinity values, expressed as Kübler Index (KI), suggesting an estimated temperature experienced by the Longi Units in the range of 100-150°C. Starting from this range the diagenetic/tectonic evolution should correspond to a lithostatic/tectonic loading of about 4-5 km.

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“…In the present case, the ðLa=YbÞ ch ratio is lower than the ðLa=YbÞ ch ratio of the PAAS, and it is not correlated with the weathering indices. Furthermore, the redbed samples are characterized by sedimentary recycling, as indicated in Al 2 O 3 -TiO 2 -Zr and Zr=Sc versus Th=Sc diagrams (Garcia et al 1991). A mixing trend, characterized mostly by changes in the Al 2 O 3 -TiO 2 -Zr ratio, which could be due to a recycling effect, is clearly envisaged in the ternary Al 2 O 3 -TiO 2 -Zr diagram ( fig.…”

Section: Paleoweathering Sorting and Recycling Processesmentioning

confidence: 99%

Compositional and Geochemical Signatures for the Sedimentary Evolution of the Middle Triassic–Lower Jurassic Continental Redbeds from Western-Central Mediterranean Alpine Chains

Critelli¹,

Mongelli²,

Perri³

et al. 2008

The Journal of Geology

100

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A B S T R A C TCompositional and chemical analyses suggest that Middle Triassic-Lower Liassic continental redbeds (in the internal domains of the Betic, Maghrebian, and Apenninic chains) can be considered a regional lithosome marking the TriassicJurassic rift-valley stage of Tethyan rifting, which led to the Pangaea breakup and subsequent development of a mosaic of plates and microplates. Sandstones are quartzose to quartzolithic and represent a provenance of continental block and recycled orogen, made up mainly of Paleozoic metasedimentary rocks similar to those underlying the redbeds. Mudrocks display K enrichments; intense paleoweathering under a hot, episodically humid climate with a prolonged dry season; and sediment recycling. Redbeds experienced temperatures in the range of 100°-160°C and lithostatic/ tectonic loading of more than 4 km. These redbeds represent an important stratigraphic signature to reconstruct a continental block (Mesomediterranean Microplate) that separated different realms of the western Tethys from MiddleLate Jurassic to Miocene, when it was completely involved in Alpine orogenesis.

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Fractionation between TiO2 and Zr as a measure of sorting within shale and sandstone series (Northern Portugal)

Cited by 109 publications

References 0 publications

Source areas of the Grybów sub-basin: micropaleontological, mineralogical and geochemical provenance analysis (Outer Western Carpathians, Poland)

Source areas of the Grybów sub-basin: micropaleontological, mineralogical and geochemical provenance analysis (Outer Western Carpathians, Poland)

Sedimentary recycling, provenance and paleoweathering from chemistry and mineralogy of Mesozoic continental redbed mudrocks, Peloritani mountains, southern Italy

Compositional and Geochemical Signatures for the Sedimentary Evolution of the Middle Triassic–Lower Jurassic Continental Redbeds from Western-Central Mediterranean Alpine Chains

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