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Earth Science Blog - Blog sobre Geociencia Geoscience in English and Español
Daniel Garcia-Castellanos
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- January 6, 2013
- 06:00 PM
- 215 views
Questiones abiertas en geociencia
by Daniel Garcia-Castellanos in Retos Terrícolas
preguntas científicas que mantienen ocupados a investigadores de las disciplinas relacionadas con la tierra sólida... Read more »
Zwaan, J. (2010) Origin and evolution of earth: Research questions for a changing planet by the committee on grand research questions in the solid-earth sciences, National Research Council. National Academies Press, Washington, D.C., 2008. No. of pages: 137. (paperback). Geological Journal, 45(2-3), 350-350. DOI: 10.1002/gj.1188
- September 10, 2012
- 08:48 AM
- 239 views
See the Lithosphere moving up and down
by Daniel Garcia-Castellanos in Retos Terrícolas
The lithosphere, the uppermost resistent layer of the Earth, rests on the fluid mantle underneath and moves up (or down) in response to weight removed from its surface (or placed on it), such as ice capes, large lakes, mountain ranges, volcanos... Isostatic sinking (subsidence) andrebound (uplift) occurring when anice sheet forms by climate coolingand when it is removed by climate warming. The downwarping (isostatic subsidence)produced by the ice accumula........ Read more »
G, K, Gilbert. (1890) Lake Bonneville. USGS Reports. DOI: 10.5962/bhl.title.45550
Lake Bonneville fluctuations and global climate change. (1997) Oviatt, Charles G. Geology, 25(2), 155. DOI: 10.1130/0091-7613(1997)025
- July 19, 2012
- 03:00 PM
- 353 views
Outstanding Open Questions in Geoscience - a draft
by Daniel Garcia-Castellanos in Retos Terrícolas
Big open questions in today's Earth Science basic research. The aim was to compile specific questions that keep Earth researchers busy across disciplines... Read more »
BESR. (2008) Origin and Evolution of Earth: Research Questions for a Changing Planet . The National Academies Press. DOI: 10.1002/gj.1188
- May 14, 2012
- 07:47 PM
- 472 views
Cómo reconocer la buena geociencia
by Daniel Garcia-Castellanos in Retos Terrícolas
[Versión extendida del artículo para Amazings]La ciencia avanza A Hombros de Gigantes, decía Chartres ya en el siglo XII. La frase se refierea que nuestra pequeña contribución al conocimientose basa y se suma a lo que nos transmitierongeneraciones anteriores, y sólo gracias a ellaspodemos ver más allá. [Fuente]. ¡Hay tantos estudios que se arrogan el estatus de científico sin serlo! Los Magufos están incluídos en ese grupo,........ Read more »
Alvarez, W., & Leitao, H. (2011) The neglected early history of Geology: The Copernican Revolution as a major advance in understanding the Earth: REPLY. Geology, 39(9). DOI: 10.1130/G32501Y.1
- May 8, 2012
- 02:01 PM
- 447 views
How to dig a submarine canyon with no net erosion
by Daniel Garcia-Castellanos in Retos Terrícolas
[This just appeared in Geology (link to abstract)]Survival of a submarine canyon during long-term outbuilding of a continental marginDavid Amblas et al., Universitat de Barcelona, E-08028 Barcelona, Spain. Geology, doi: 10.1130/G33178.1. The resemblance between subaerial and submarine canyons has led to the long-standing view of submarine canyons as purely erosive landforms. Yet submarine canyons forming at continental slopes that grow from long-term accumulation of sediment are observed both at........ Read more »
Amblas, D., Gerber, T., De Mol, B., Urgeles, R., Garcia-Castellanos, D., Canals, M., Pratson, L., Robb, N., & Canning, J. (2012) Survival of a submarine canyon during long-term outbuilding of a continental margin. Geology. DOI: 10.1130/G33178.1
- March 14, 2012
- 07:33 PM
- 770 views
Seafloor spreading, magnetic reversals, and plate tectonics
by Daniel Garcia-Castellanos in Retos Terrícolas
Making science implies the formulation of refutable hypothesis, this is, the proposal of new ideas (based on former research) that lead to predictions that can be either confirmed or falsified (by future research).Timing of the last reversals of the Earth's magnetic field.The vertical axis is Time, in million years before present.Periods in black matched today's polarity. Source: Wikimedia Commons.A case history in Earth science is the confirmation of the plate tectonics theory during ........ Read more »
VINE, F., & MATTHEWS, D. (1963) Magnetic Anomalies Over Oceanic Ridges. Nature, 199(4897), 947-949. DOI: 10.1038/199947a0
Pétrélis, F., Besse, J., & Valet, J. (2011) Plate tectonics may control geomagnetic reversal frequency. Geophysical Research Letters, 38(19). DOI: 10.1029/2011GL048784
Glatzmaiers, G., & Roberts, P. (1995) A three-dimensional self-consistent computer simulation of a geomagnetic field reversal. Nature, 377(6546), 203-209. DOI: 10.1038/377203a0
- February 19, 2012
- 07:03 AM
- 538 views
Steady-state topography during orogenesis: Erosion vs. Tectonics competition
by Daniel Garcia-Castellanos in Retos Terrícolas
I uploaded to Youtube a simple but interesting numerical model. It combines a constant tectonic uplift with the calculation of river erosion along a section, allowing enough time to reach two successive topographic steady states (one during uplift, another one after):Steady state topography development, and other parameters of the model.Uplift occurs between x=-50 and x=+50 km. The dashed line indicates the topographic profile that would develop ........ Read more »
Whipple, K. (2009) The influence of climate on the tectonic evolution of mountain belts. Nature Geoscience, 2(2), 97-104. DOI: 10.1038/ngeo413
Willett, S., & Brandon, M. (2001) On steady states in mountain belts. Geology, 175-178. info:/
- February 17, 2012
- 12:05 PM
- 688 views
Megafloods, gradualism, and the birth of geology
by Daniel Garcia-Castellanos in Retos Terrícolas
The study of the mechanisms shaping landscape started only in the 17th century, when the principles of geology (superposition, original horizontality, and lateral continuity of strata, and the uniformitarianism and gradualism of geological processes) were developed by pioneers like Steno, Hutton, Lyell, etc. ... Read more »
Herget, J. (2009) Reconstruction of Pleistocene ice-dammed lake outburst floods in the Altai Mountains, Siberia. GSA Special Papers . DOI: 10.1130/0-8137-2386-8.1
Devon M. Burr ,, Paul A. Carling ,, & Victor R. Baker. (2010) Megaflooding on Earth and Mars. Cambridge University Press. DOI: 10.1017/CBO9780511635632
- February 17, 2012
- 05:17 AM
- 558 views
The Messinian Salinity Crisis (3/3) - Causal mechanisms for a huge salt pan
by Daniel Garcia-Castellanos in Retos Terrícolas
[First chapter of this post][Spanish version of this post] In two previous parts of this post I tried to summarize what is known about the Messinian salinity crisis, the period of widespread salt precipitation in the Mediterranean. A key unknown is the depth of the last seaway that allowed the inflow of Atlantic water, replacing the evaporation at the Med's surface. Hydraulic calculations indicate that a seaway that was too shallow (less than ~10 meters deep) would imply a&nb........ Read more »
Garcia-Castellanos D, & Villaseñor A. (2011) Messinian salinity crisis regulated by competing tectonics and erosion at the Gibraltar arc. Nature, 480(7377), 359-63. PMID: 22170684
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