Results 71 to 80 of about 5,874 (174)

Diagenetic evolution characteristics of Paleogene lacustrine carbonate reservoirs in central Bohai sea, China

open access: yesJournal of Natural Gas Geoscience, 2018
The distribution of high-quality reservoirs in Shahejie Formation of the Shijiutuo Uplift, Central Bohai Sea, is the key factor to determine the oil and gas accumulation.
Zhengxiang Lv   +4 more
doaj   +1 more source

Evaporitic Chert Provenance: Evaluating Petrographic and Geochemical Workflows for Source Discrimination

open access: yesArchaeometry, EarlyView.
ABSTRACT Chert tools were widely used in prehistory by human societies due to their knapping suitability and availability, but their relatively uniform composition, especially in evaporitic cherts, complicates sourcing, requiring specialised analytical methods.
Bruno Gómez de Soler   +5 more
wiley   +1 more source

Evolución de la mineralogía de arcillas en el tránsito diagénesis-metamorfismo de bajo grado en el grupo Urbión (Cretácico inferior) de la cuenca de los Cameros (Soria-La Rioja) [PDF]

open access: yes, 1994
Tesis Universidad Complutense de Madrid, Facultad de Ciencias Geológicas, Departamento de Cristalografía y Mineralogía, 1994Se ha realizado un estudio de la evolución de la mineralogía de arcillas en los materiales pertenecientes al grupo urbión ...
Fernández Barrenechea, José María
core   +1 more source

Proteomic Sex Estimation From Embedded Tooth Enamel

open access: yesArchaeometry, EarlyView.
ABSTRACT Teeth hold insights into childhood diet, health and demography—including chromosomal sex. Proteomic analysis can detect peptide biomarkers from amelogenin genes encoded on X and Y chromosomes, allowing sex estimation. Embedding resins, necessary for thin sectioning teeth, can damage analytical systems, preventing proteomic analysis. We present
E. L. Sudron   +11 more
wiley   +1 more source

Evaluation of the Rb/Sr ratio as an indicator of chemical weathering: a case study from five sedimentary sections in Northeast China

open access: yesBoreas, EarlyView.
Chemical weathering plays a pivotal role in the Earth's surface material cycle and global climate regulation. It not only facilitates the reconstruction of palaeoclimate characteristics but also provides essential insights into Earth's evolutionary history.
Zhenyu Wei   +9 more
wiley   +1 more source

La edad de las rocas [PDF]

open access: yes, 2021
Todos los seres humanos sabemos cuántos años tenemos, pero cuando conocemos a alguien; a menudo le preguntamos ¿cuántos años tienes? Los geólogos, cuando analizan una roca; se preguntan ¿Qué edad tendrá esta roca?...
Instituto Geológico Minero y Metalúrgico
core  

Ecological variability of Hippopotamus antiquus from the late Early–Middle Pleistocene of Megalopolis Basin (Greece): Evidence for dynamic habitats in a glacial microrefugium

open access: yesBoreas, EarlyView.
This study investigates the ecology of the extinct European Hippopotamus from the late Early–Middle Pleistocene (c. 900–400 ka) sequence of the Megalopolis Basin, a glacial microrefugium for temperate taxa in southern Greece. Using stable carbon (δ13C) and oxygen (δ18O) isotope analyses and microwear analyses of Hippopotamus dental elements, we ...
Effrosyni Roditi   +9 more
wiley   +1 more source

Petrología sedimentaria. Notas de teoría. 11. Las rocas evaporíticas

open access: yes, 2010
En este tema se estudiarán los rasgos básicos de las rocas evaporíticas, incluyendo su textura y mineralogía. Una parte del tema se dedica a los mecanismos y modelos de precipitación de evaporitas.
Alonso Zarza, Ana María
core   +1 more source

Palinoestratigrafía por medio de miosporas y acritarcos de las Formaciones Furada, San Pedro y Carazo (Silúrico Superior-Devónico Inferior; Cordillera Cantábrica) en las provincias de Oviedo, León y Palencia

open access: yes, 1979
Estudio paleontológico de los elementos palinológicos del tránsito Silúrico/Devónico en la Cordillera Cantábrica y su utilización en problemas de correlación diagénesis y cronoesmarigrafía.
Rodríguez González, Rosa Mª.
core  

Lead isotope evidence for Antarctic Ice Sheet changes in the Weddell Sea sector since the Last Glacial Maximum

open access: yesBoreas, EarlyView.
The Weddell Sea influences global ocean circulation and sea level through modulating Antarctic Bottom Water formation and Antarctic Ice Sheet discharges, but the history of ice‐sheet dynamics in this region remains poorly constrained due to limited well‐dated geological records.
Huang Huang   +9 more
wiley   +1 more source

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