Large Igneous Province Formation
Earth has an outer shell made of a number of discrete, moving tectonic plates floating on a molten, convective mantle above a solid core. The mantle’s flow is driven by the descent of cold tectonic plates during subduction and the complementary ascent of plumes of hot material from lower levels. The surface of the earth reflects stretching, thickening and bending of the tectonic plates as they interact.
Ocean-plate creation at upwellings, spreading and subduction are well accepted fundamentals of plate tectonics, with the upwelling of hot mantle materials and the sinking of the cooler ocean plates driving the mantle convection. In this model, tectonic plates diverge at mid-ocean ridges, where hot mantle rock flows upward to fill the space. Plate-tectonic processes account for the vast majority of Earth’s volcanism.
Beyond the effects of convectively driven motion, deep processes have other influences on the surface topography. The convective circulation drives up-wellings and down-wellings in Earth's mantle that are reflected in local surface levels. Hot mantle materials rising up in a plume can spread out radially beneath the tectonic plate causing regions of uplift. These ascending plumes play an important role in LIP formation.
Read more about this topic: Large Igneous Province
Famous quotes containing the words large, province and/or formation:
“As we approached the log house,... the projecting ends of the logs lapping over each other irregularly several feet at the corners gave it a very rich and picturesque look, far removed from the meanness of weather-boards. It was a very spacious, low building, about eighty feet long, with many large apartments ... a style of architecture not described by Vitruvius, I suspect, though possibly hinted at in the biography of Orpheus.”
—Henry David Thoreau (18171862)
“Female Virtues are of a Domestick turn. The Family is the proper Province for Private Women to Shine in. If they must be showing their Zeal for the Publick, let it not be against those who are perhaps of the same Family, or at least of the same Religion or Nation, but against those who are the open, professed, undoubted Enemies of their Faith, Liberty, and Country.”
—Joseph Addison (16721719)
“The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.”
—Aristotle (384322 B.C.)