![]() ![]() ![]() The deformation and squashing caused by the collision of the two great plates has caused mountain ranges to rise throughout the country. It is the motion between these two plates, and the deformation that occurs in the boundary zone between the plates, that has given rise to much of New Zealand's geology as we see it today. These zones may be anything from a few kilometres to a few hundred kilometres wide. Plate boundary zones are the zones of interaction between adjacent plates where they collide, pull apart or slide past each other. Plate boundary zones occur where the effects of the interactions are unclear, and the boundaries, usually occurring along a broad belt, are not well defined and may show various types of movements in different episodes.Almost all of New Zealand is in the deforming plate boundary zone, where reasonably steady deformation is occurring all the time. Thus, crust is cracked and broken at transform margins, but is not created or destroyed. In contrast to convergent and divergent boundaries, no magma is formed. As the plates alternately jam and jump against each other, earthquakes rattle through a wide boundary zone. Rocks that line the boundary are pulverized as the plates grind along, creating a linear fault valley or undersea canyon. Two plates sliding past each other, Natural or human-made structures that cross a transform boundary are offset-split into pieces and carried in opposite directions. Transform boundaries (Conservative) Transform plate boundaries Thus at convergent boundaries, continental crust, made of granite, is created, and oceanic crust is destroyed. Magma formed from melting plates solidifies into granite, a light colored, low-density rock that makes up the continents. Magma rises into and through the other plate, solidifying into new crust. ![]() If one of the colliding plates is topped with oceanic crust, it is forced down into the mantle where it begins to melt. Plate Boundary Types Divergent boundary (Constructive) Plate boundary zones: broad belts in which boundaries are not well defined and the effects of plate interaction are unclear.Transform boundaries: where crust is neither produced nor destroyed as the plates slide horizontally past each other.Convergent boundaries: where crust is destroyed as one plate dives under another.Divergent boundaries: where new crust is generated as the plates pull away from each other.Convergent boundaries - where crust is destroyed as one plate dives under another. There are four types of plate boundaries: Divergent boundaries - where new crust is generated as the plates pull away from each other. “Read More about: What is Plate Tectonics? “ What are the 4 types of plate boundary? Most geologic activities, including volcanoes, earthquakes, and mountain building, take place at plate boundaries. Plate boundaries are the edges where two plates meet. This image shows the three main types of plate boundaries: divergent, convergent, and transform.
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