Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico

LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry), PIXE (Particle Induced X-ray Emision), µ-XRD (Micro X-ray Diffraction) and SEM (Scanning Electron Microscope) techniques are combined in molecular taphonomy research on soft tissue remains and substrata in fossil assemblage fro...

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Detalles Bibliográficos
Autores principales:	Riquelme, Francisco, Alvarado Ortega, Jesús, Ruvalcaba Sil, José Luis, Bernal Uruchurtu, Juan Pablo, Aguilar Franco, Manuel, Porras Múzquiz, Héctor
Formato:	Objeto de conferencia
Lenguaje:	Inglés
Publicado:	2010
Materias:	Ciencias Naturales Paleontología
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/16955
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-16955
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Naturales Paleontología
spellingShingle	Ciencias Naturales Paleontología Riquelme, Francisco Alvarado Ortega, Jesús Ruvalcaba Sil, José Luis Bernal Uruchurtu, Juan Pablo Aguilar Franco, Manuel Porras Múzquiz, Héctor Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico
topic_facet	Ciencias Naturales Paleontología
description	LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry), PIXE (Particle Induced X-ray Emision), µ-XRD (Micro X-ray Diffraction) and SEM (Scanning Electron Microscope) techniques are combined in molecular taphonomy research on soft tissue remains and substrata in fossil assemblage from the Late Cretaceous (Turonian) Múzquiz Lagerstätte, Coahuila, northeastern of Mexico. Skin, gills, digestive tract, blood vessel and muscle fiber show preserved features at cellular levels. The study also revealed bacterial and fungal cells with an exceptional preservation induced by autigenic biominerals such as flourapatite and calcite; this biomineralization of cells probably occurred by spontaneous reactions in supersaturated solutions. Soft tissue preservation represents an important source of microbial fossilization and this process is recognizable as a bio-inorganic pattern of tiny crystallites preserving the morphology of both microbes and soft tissues. Organic contents of muscle cells were replaced by phosphatized minerals. Fungal and bacterial cells, including extracellular polymer (EPS), were preserved as casts and moulds. Ultrastructural and biogeochemical analysis of the sedimentary rock matrix yielded significant data on the genesis of the limestone-marl laminar rhythmites of the Múzquiz fossil bearing strata, probably induced by diagenetic alteration, mainly as consequence of aragonite dissolution in the laminar interfaces. Biogeochemical analysis of fossil material showed a high concentration of Si, P, Ca, Fe and enrichment of Na, Mg, K , Cr, Mn, Zn, As, Sr and Ba, suggesting that such elements may be involved in the process of soft tissue preservation and could be used as fossil fingerprints. Trace metal content reveals a significant amount of S, V, Ni, Cu, Cd, Sb, Tl, Bi, Th and U. These can operate as paleoenvironmental markers in order to reconstruct the ancient conditions and simulate the Lagerstätten settings, having direct implications for ecosystems evolutionary studies.
format	Objeto de conferencia Objeto de conferencia
author	Riquelme, Francisco Alvarado Ortega, Jesús Ruvalcaba Sil, José Luis Bernal Uruchurtu, Juan Pablo Aguilar Franco, Manuel Porras Múzquiz, Héctor
author_facet	Riquelme, Francisco Alvarado Ortega, Jesús Ruvalcaba Sil, José Luis Bernal Uruchurtu, Juan Pablo Aguilar Franco, Manuel Porras Múzquiz, Héctor
author_sort	Riquelme, Francisco
title	Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico
title_short	Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico
title_full	Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico
title_fullStr	Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico
title_full_unstemmed	Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico
title_sort	molecular taphonomy and microbial biomineralization in the late cretaceous múzquiz lagerstätte, mexico
publishDate	2010
url	http://sedici.unlp.edu.ar/handle/10915/16955
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Molecular taphonomy and microbial biomineralization in the Late Cretaceous Múzquiz Lagerstätte, Mexico

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