Video Experimental Relacionado
Updated: Jul 12, 2026
10:39
Multimodal Optical Microscopy Methods Reveal Polyp Tissue Morphology and Structure in Caribbean Reef Building Corals
Published on: September 5, 2014
Los depósitos de impacto de la frontera cretáceo-terciario proximal en el Caribe
Science (New York, N.Y.)
|May 18, 1990
Resumen
El impacto del límite Cretácico-Terciario (K-T) probablemente ocurrió en una cuenca oceánica entre las Américas. La evidencia incluye gruesas capas de eyecciones y depósitos de olas gigantes, lo que sugiere un sitio de impacto oceánico cercano.
Área de la Ciencia:
- La geociencia es la ciencia de la tierra.
- Paleontología Paleontología.
- Estudios de cráteres de impacto Estudios de cráteres de impacto
Sus antecedentes:
- El límite Cretácico-Terciario (K-T) marca un evento significativo de extinción masiva.
- La teoría predominante atribuye este evento a un gran impacto de asteroides.
- La ubicación precisa y la naturaleza del impacto K-T son temas de investigación en curso.
Objetivo del estudio:
- Para determinar la ubicación y la naturaleza del evento de impacto K-T.
- Para analizar la evidencia geológica de un impacto oceánico.
- Para investigar las características de los depósitos de eyecciones y ondas de impacto.
Principales métodos:
- El análisis de oligoelementos.
- Los estudios isotópicos incluyen:
- Examen mineralógico de los sedimentos límite.
- Perfilamiento de la reflexión sísmica.
Principales resultados:
- Los datos geoquímicos y mineralógicos indican un impacto oceánico.
- Abundantes minerales sacudidos y gruesas capas de eyecciones sugieren un impacto entre las Américas.
- Los gruesos depósitos sedimentarios en la cuenca colombiana y en Cuba son consistentes con gigantescas ondas de impacto.
- Una gran estructura enterrada en la cuenca colombiana es un candidato potencial de impacto.
Conclusiones:
- El evento de impacto K-T ocurrió en una cuenca oceánica, probablemente entre las Américas.
- La evidencia apunta a un impacto oceánico masivo que generó fenómenos geológicos significativos.
- Una estructura de impacto candidata en la cuenca colombiana requiere más investigación.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:56The Fossil Record
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
01:27Diversity of Protists III
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
01:07Speciation Rates
Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
02:31Habitat Fragmentation
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
01:30Impact
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
01:30Types of Impact
Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...