Contents of RSS feed for:
For this discussion, the assumptions and ideas of plate tectonics are used unchallenged to show their internal problems regarding mountain building (orogeny). Quotes are from professional journals.
What drives the plates?
Study of the motions of plates is called kinematics, while study of the driving forces is called dynamics. "A key to the simplicity of plate tectonics is that the strength of lithospheric plates enables the analysis of their kinematics to be isolated and treated separately from the dynamic processes controlling plate motions; relative velocities of plates can be analysed without reference to the forces that give rise to them"34.
More on this topic.
Published: Wed, 18 May 2016 08:21:46 GMT
Histoire géologique de la distribution spatiale de l'hydrosphère et de la lithosphère de la planète; dérive des continents et variations climatiques; un site passionnant dû au géologue Christopher Scotese.
Published: Tue, 29 Jul 2014 11:36:47 GMT
The study, “World Shale Gas and Shale Oil Resource Assessment”, performed by Advanced Resources International (ARI) with sponsorship of the U.S. Energy Information Administration (EIA), targeted 95 shale basins and 137 shale formations in 41 countries (excluding the U.S.). For purposes of completeness, we have also provided information from ARI’s proprietary data base of U.S. shale gas and shale oil resources.
Published: Tue, 01 Apr 2014 15:24:04 GMT
What Triggered the U.S. Shale Gas Revolution?
The use of horizontal drilling in conjunction with hydraulic fracturing has greatly expanded the ability of producers to profitably produce natural gas from low permeability geologic formations, particularly shale formations. Application of fracturing techniques to stimulate oil and gas production began to grow rapidly in the 1950s, although experimentation dates back to the 19th century.
Starting in the mid- 1970s, a partnership of private operators, the U.S. Department of Energy and the Gas Research Institute endeavored to develop technologies for the commercial production of natural gas from the relatively shallow Devonian (Huron) shale in the Eastern United States. This partnership helped foster technologies that eventually became crucial to producing natural gas from shale rock, including horizontal wells, multi-stage fracturing, and slick-water fracturing.
Published: Tue, 01 Apr 2014 15:05:27 GMT
Oil shale is commonly defined as a fine-grained sedimentary rock containing organic matter that yields substantial amounts of oil and combustible gas upon destructive distillation. Most of the organic matter is insoluble in ordinary organic solvents; therefore, it must be decomposed by heating to release such materials. Underlying most definitions of oil shale is its potential for the economic recovery of energy, including shale oil and combustible gas, as well as a number of byproducts. A deposit of oil shale having economic potential is generally one that is at or near enough to the surface to be developed by open-pit or conventional underground mining or by in-situ methods.
Published: Tue, 01 Apr 2014 15:03:07 GMT
Une avancée dans la compréhension de la structure du charbon; à partir de coupes microscopiques:
If you think that coal is a boring black rock then you have never seen it through a transmitted light microscope. The microscope reveals coal's hidden beauty as well as its composition. Coal seams form from thick accumulations of plant debris, usually deposited in a swamp. The tiny particles of plant debris and swamp sediment give a spectacular show when viewed through the microscope. Well preserved woody material is bright red, spores are brilliant yellow, algal material is yellow-orange, charcoal and opaque minerals are black, and grains of many transparent minerals are white. It's hard to believe that coal can be so colorful!
Published: Tue, 01 Apr 2014 14:57:51 GMT
The history of geology is concerned with the development of the natural science of geology. Geology is the scientific study of the origin, history, and structure of the Earth. Throughout the ages geology provides essential theories and data that shape how society conceptualizes the Earth.
Published: Thu, 09 Aug 2012 09:43:59 GMT
Published: Tue, 19 Jun 2012 14:00:23 GMT
Published: Sun, 22 Aug 2010 12:43:38 GMT