Sea Floor Metamorphism
The motion of these plates is dictated largely by metamorphic petrology principally the pressure induced transformation of relatively low density minerals into high density minerals.
Sea floor metamorphism. The chemical components and crystal structures of the minerals making up the rock may change even. Alex strekeisen i vetrini della mia fantasia. Metamorphism is defined as follows. 10 ga miaowan ophiolite huangling anticline china 701 figure 4.
Sea floor metamorphism recorded in epidosites from the ca. The mineralogical and structural adjustment of solid rocks to physical and chemical conditions that have been imposed at depths below the near surface zones of weathering and diagenesis and which differ from conditions under which the rocks in question originated. Ocean ridge metamorphism takes place at mid oceanic ridges in response to sea floor spreading. The fracture zone deformation postdates sea floor metamorphism and postdates the paleomagnetization bonhommet et al 1988.
Seafloor basalt interaction between cold seawater and hot mafic ultramafic rocks in the 65000 km long oceanic spreading ridge system is likely the largest active metamorphic system on the planet. Metamorphism of sea floor the earth is divided into tectonic plates. The change occurs primarily due to heat pressure and the introduction of chemically active fluids. Photomicrographs of epidotized samples from miaowan ophiolite.
0bregional local 1borogenic burial ocean floor hydrothermal contact dislocation impact hot slab combustion lightning pyrometamorphism fig. The crust is tilted by 100 away from the centre of the troodos dome but most of the variation in dike orientation is original. Recognition of on land ophiolite suites as ancient examples of oceanic crust and mantle provide insights into the thermal and dynamothermal regimes that characterize ocean floors. This metamorphism is attributed to the high heat flow and intense fluid circulation that occurs along oceanic ridges.
The existence of metamorphic rocks formed under the ocean has been described in detail only since 1966 when rocks were dredged from rift valley walls in the carlsberg ridge cann 1969 and near 22n in the atlantic ocean melson and van andel 1966. At individual outcrops dikes of different near synchronous ages crosscut one another obliquely. The plate tectonic setting is therefore characterized by a divergent plate boundary regime. Chapter 9 ocean floor metamorphism metamorphic processes and the extent of metamorphism in the oceanic environment are still not well known.
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