Rare-earth element and stable isotope signatures of kaolin from a Pliocene lateritic weathering profile at mid-latitude region (Andalusia, Spain): Implications for paleoweathering and paleoclimatic reconstructions

Fernández-Caliani, Juan Carlos

doi:10.1016/j.catena.2018.04.025

Cited by 9 publications

(3 citation statements)

References 61 publications

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“…Comparison of the molecular profile from the Cambrian rock to lipid assemblages characterized in other ancient deposits in southern Spain provides further evidence that much of this organic material reflects recent microbiota rather than preservation over geological timescales. Prior studies of paleosol formations dated to the early Pleistocene [ 32 , 114 , 115 ], which should exhibit distinct signs of thermal maturation among hydrocarbon biomarkers [ 116 ]. However, the rock samples here contain an abundance of microbiota-derived lipids in sample 95E5/2 retain strong even-over-odd predominance.…”

Section: Discussionmentioning

confidence: 99%

The Molecular Profile of Soil Microbial Communities Inhabiting a Cambrian Host Rock

Huang,

Carrizo,

Sánchez-García

et al. 2024

Microorganisms

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The process of soil genesis unfolds as pioneering microbial communities colonize mineral substrates, enriching them with biomolecules released from bedrock. The resultant intricate surface units emerge from a complex interplay among microbiota and plant communities. Under these conditions, host rocks undergo initial weathering through microbial activity, rendering them far from pristine and challenging the quest for biomarkers in ancient sedimentary rocks. In addressing this challenge, a comprehensive analysis utilizing Gas Chromatography Mass Spectrometry (GC-MS) and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) was conducted on a 520-Ma-old Cambrian rock. This investigation revealed a diverse molecular assemblage with comprising alkanols, sterols, fatty acids, glycerolipids, wax esters, and nitrogen-bearing compounds. Notably, elevated levels of bacterial C16, C18 and C14 fatty acids, iso and anteiso methyl-branched fatty acids, as well as fungal sterols, long-chained fatty acids, and alcohols, consistently align with a consortium of bacteria and fungi accessing complex organic matter within a soil-type ecosystem. The prominence of bacterial and fungal lipids alongside maturity indicators denotes derivation from heterotrophic activity rather than ancient preservation or marine sources. Moreover, the identification of long-chain (>C22) n-alkanols, even-carbon-numbered long chain (>C20) fatty acids, and campesterol, as well as stigmastanol, provides confirmation of plant residue inputs. Furthermore, findings highlight the ability of contemporary soil microbiota to inhabit rocky substrates actively, requiring strict contamination controls when evaluating ancient molecular biosignatures or extraterrestrial materials collected.

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Section: Discussionmentioning

confidence: 99%

The Molecular Profile of Soil Microbial Communities Inhabiting a Cambrian Host Rock

Huang,

Carrizo,

Sánchez-García

et al. 2024

Microorganisms

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“…Proses dekomposisi batuan maupun mineral di permukaan bumi dikenal sebagai pelapukan. Pelapukan rentan terjadi pada wilayah tropis akibat adanya derajat kelembaban tinggi dan siklus hujan sepanjang tahun (Fernández-Caliani, 2018;Permanajati et al, 2018;Iqbal et al, 2020). Umur, struktur, tekstur, distribusi pori, permeabilitas dan komposisi batuan induk juga mempengaruhi intensitas pelapukan (Alam, 2012;Garzanti et al, 2014).…”

Section: Nama Plutonunclassified

“…Umur, struktur, tekstur, distribusi pori, permeabilitas dan komposisi batuan induk juga mempengaruhi intensitas pelapukan (Alam, 2012;Garzanti et al, 2014). Studi pelapukan bermanfaat untuk menjelaskan kondisi lingkungan pada masa lampau (Bazilevskaya et al, 2013;Sahoo et al, 2017;Fernández-Caliani, 2018) dan pengayaan maupun pengurangan kadar logam tertentu. Intensitas penyelidikanpelapukan pada granitoid meningkat karena berkorelasi dengan pengayaan ferit, bauksit, maupun Unsur Tanah Jarang (UTJ) seperti dijelaskan dalam studi sebelumnya (Cahyaningsih et al, 2018;.…”

Section: Nama Plutonunclassified

Komparasi Karakter Pengayaan Logam Pada Dua Seksi Pluton Lassi Di Wilayah Solok, Provinsi Sumatra Barat

Irzon

Suhermat²,

Suwargana

et al. 2023

JURNAL GEOMINERBA

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Intrusi di Sumatra adalah bagian dari jajaran granitoid di Asia Tenggara. Granitoid Mandala Gunungapi terdapat di bagian barat Sumatra dan dalam kisaran Jajaran Bukit Barisan. Intrusi pada mandala ini cukup unik karena berupa pluton berukuran kecil, termasuk Pluton Lassi, tidak seperti intrusi di Mandala Timur dan Mandala Tengah yang berupa batolit. Wilayah Sumatra berada dalam lingkungan tropis sehingga rentan terhadap pelapukan. Studi ini bertujuan untuk membandingkan dampak pelapukan terhadap pengayaan logam pada dua profil Pluton Lassi dari dua seksi yang berbeda. Komposisi setiap sampel dianalisis menggunakan XRF dan ICP-MS di Pusat Survei Geologi. Sampel segar diklasifikasikan sebagai granodiorit berdasarkan studi mikroskopis. Berdasarkan analisis kimia, sampel tersebut adalah diorit, seri Kalk Alkalin tinggi-K, metalumina, dan bertipe-I. Kedua profil memperlihatkan peningkatan kadar Fe2O3T, Al2O3 dan TiO2 meningkat seiring dengan peningkatan intensitas pelapukan. Sebaliknya, SiO2, CaO, MgO, Na2O, dan K2O justru menurun. Kelimpahan UTJ-ringan yang lebih besar daripada UTJ-berat terindikasi pada seluruh sampel. Kedua profil memperlihatkan perbedaan pada anomali Eu, intensitas pengayaan UTJ-ringan terhadap UTJ-berat, dan karakter normalisasi UTJ-berat.

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Geomicrobiology of Río Tinto (Iberian Pyrite Belt): A Geological and Mineralogical Mars Analogue

Amils,

Escudero,

Huang

et al. 2024

Geomicrobiology: Natural and Anthropogenic Settings

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Rare-earth element and stable isotope signatures of kaolin from a Pliocene lateritic weathering profile at mid-latitude region (Andalusia, Spain): Implications for paleoweathering and paleoclimatic reconstructions

Cited by 9 publications

References 61 publications

The Molecular Profile of Soil Microbial Communities Inhabiting a Cambrian Host Rock

The Molecular Profile of Soil Microbial Communities Inhabiting a Cambrian Host Rock

Komparasi Karakter Pengayaan Logam Pada Dua Seksi Pluton Lassi Di Wilayah Solok, Provinsi Sumatra Barat

Geomicrobiology of Río Tinto (Iberian Pyrite Belt): A Geological and Mineralogical Mars Analogue

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