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Una bola de nieve de la tierra neoproterozoica.

Hoffman¹, Kaufman, Halverson

¹P. F. Hoffman, G. P. Halverson, D. P. Schrag, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. A. J. Kaufman, Department of Geology, University of Maryland, College Park, MD 20742, USA.

Science (New York, N.Y.)

|August 28, 1998

Resumen

Un evento de bola de nieve de la Tierra del Neoproterozoico causó un colapso prolongado en la productividad del océano. El abrupto calentamiento volcánico condujo a condiciones de invernadero extremas y a la precipitación global de carbonatos de capa.

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Área de la Ciencia:

La geoquímica es la geoquímica.
Paleoclimatología Paleoclimatología
La sedimentología sedimentológica.

Sus antecedentes:

La Era Neoproterozoica experimentó severas glaciaciones globales, potencialmente un evento de "la Tierra bola de nieve".
Las rocas carbonatadas asociadas con estos depósitos glaciales exhiben globalmente anomalías de isótopos negativos de carbono.
Comprender la respuesta del océano a los cambios climáticos extremos es crucial.

Objetivo del estudio:

Investigar la causa de las anomalías de isótopos negativos de carbono en las rocas carbonatadas del Neoproterozoico.
Reconstruir la productividad biológica del océano durante y después de la glaciación global.
Explicar la formación de las rocas carbonatadas de la tapa en todo el mundo.

Principales métodos:

Análisis de anomalías de isótopos de carbono en las rocas carbonatadas de Namibia.
Estimación del historial de hundimiento térmico.
Modelado de los niveles de dióxido de carbono atmosférico y los cambios oceanográficos.

Principales resultados:

La evidencia sugiere un colapso de varios millones de años en la productividad biológica de la superficie del océano.
El colapso está vinculado a una glaciación global (la Tierra bola de nieve).
La terminación abrupta de la glaciación, impulsada por la emisión de gases volcánicos, condujo a condiciones extremas de efecto invernadero.

Conclusiones:

La liberación volcánica de CO2 desencadenó una rápida bola de nieve, la terminación de la Tierra y el calentamiento extremo.
El CO2 atmosférico transferido a los océanos causó precipitaciones generalizadas de carbonato de calcio.
Este proceso explica la formación global de las rocas carbonatadas de la tapa.