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141.
Hydrous partial melting in the sheeted dike complex at fast spreading ridges: experimental and natural observations 总被引:5,自引:1,他引:4
Lydéric France Juergen Koepke Benoit Ildefonse Sarah B. Cichy Fabien Deschamps 《Contributions to Mineralogy and Petrology》2010,160(5):683-704
In ophiolites and in present-day oceanic crust formed at fast spreading ridges, oceanic plagiogranites are commonly observed
at, or close to the base of the sheeted dike complex. They can be produced either by differentiation of mafic melts, or by
hydrous partial melting of the hydrothermally altered sheeted dikes. In addition, the hydrothermally altered base of the sheeted
dike complex, which is often infiltrated by plagiogranitic veins, is usually recrystallized into granoblastic dikes that are
commonly interpreted as a result of prograde granulitic metamorphism. To test the anatectic origin of oceanic plagiogranites,
we performed melting experiments on a natural hydrothermally altered dike, under conditions that match those prevailing at
the base of the sheeted dike complex. All generated melts are water saturated, transitional between tholeiitic and calc-alkaline,
and match the compositions of oceanic plagiogranites observed close to the base of the sheeted dike complex. Newly crystallized
clinopyroxene and plagioclase have compositions that are characteristic of the same minerals in granoblastic dikes. Published
silicic melt compositions obtained in classical MORB fractionation experiments also broadly match the compositions of oceanic
plagiogranites; however, the compositions of the coexisting experimental minerals significantly deviate from those of the
granoblastic dikes. Our results demonstrate that hydrous partial melting is a likely common process in the root zone of the
sheeted dike complex, starting at temperatures exceeding 850°C. The newly formed melt can either crystallize to form oceanic
plagiogranites or may be recycled within the melt lens resulting in hybridized and contaminated MORB melts. It represents
the main MORB crustal contamination process. The residue after the partial melting event is represented by the granoblastic
dikes. Our results support a model with a dynamic melt lens that has the potential to trigger hydrous partial melting reactions
in the previously hydrothermally altered sheeted dikes. A new thermometer using the Al content of clinopyroxene is also elaborated. 相似文献