Occurrence of felsic rocks in oceanic gabbros from IODP hole U1473A: Implications for evolved melt migration in the lower oceanic crust.
Nguyen, Du Khac
Natland, James H.
MacLeod, Christopher J.
Dick, Henry J. B.
MetadataShow full item record
KeywordIODP; hole U1473A; Atlantis Bank; gabbros; felsic veins; melt-rock interactions; oceanic plagiogranite
Felsic rocks are minor in abundance but occur ubiquitously in International Ocean Discovery Program Hole U1473A, Southwest Indian Ridge. The trace element abundances of high-Ti brown amphibole, plagioclase, and zircon in veins, as well as the presence of myrmekitic texture in the studied felsic rocks support crystallization origin from highly-evolved melts, probably controlled by fractional crystallization. Based on geochemical criteria and texture of the mineral assemblage in felsic rocks and their relationship with host gabbros, they can be divided into three types: (1) Felsic rock with sharp boundaries is formed when felsic melt intrudes into fractures of host gabbros, resulting in minimal interaction between the melt and the wall minerals. (2) Replacive felsic rock, which is characterized by a pseudomorphic replacement of minerals in the host gabbro. This vein type is caused by the replacement of the host mineralogy by minerals in equilibrium with the felsic melts. (3) Felsic rock with diffused boundaries is formed either by infiltration of felsic melt into the solidifying gabbro body or crystallization of interstitial melts. Infiltration modes of felsic melts are likely controlled by the temperature condition of the cooling host gabbros.
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Nguyen, D. K., Morishita, T., Soda, Y., Tamura, A., Ghosh, B., Harigane, Y., France, L., Liu, C., Natland, J. H., Sanfilippo, A., MacLeod, C. J., Blum, P., & Dick, H. J. B. (2018). Occurrence of felsic rocks in oceanic gabbros from IODP hole U1473A: Implications for evolved melt migration in the lower oceanic crust. Minerals, 8(12), 583, doi:10.3390/min8120583.
Suggested CitationArticle: Nguyen, Du Khac, Morishita, Tomoaki, Soda, Yusuke, Tamura, Akihiro, Ghosh, Biswajit, Harigane, Yumiko, France, Lydéric, Liu, Chuanzhou, Natland, James H., Sanfilippo, Alessio, MacLeod, Christopher J., Blum, Peter, Dick, Henry J. B., "Occurrence of felsic rocks in oceanic gabbros from IODP hole U1473A: Implications for evolved melt migration in the lower oceanic crust.", Nguyen, D. K., Morishita, T., Soda, Y., Tamura, A., Ghosh, B., Harigane, Y., France, L., Liu, C., Natland, J. H., Sanfilippo, A., MacLeod, C. J., Blum, P., & Dick, H. J. B. (2018). Occurrence of felsic rocks in oceanic gabbros from IODP hole U1473A: Implications for evolved melt migration in the lower oceanic crust. Minerals, 8(12), 583, DOI:https://doi.org/10.3390/min8120583, https://hdl.handle.net/1912/23640
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Emplacement and high-temperature evolution of gabbros of the 16.5 degrees N oceanic core complexes (Mid-Atlantic Ridge): Insights into the compositional variability of the lower oceanic crust. Sanfilippo, Alessio; Dick, Henry JB; Marschall, Horst R.; Lissenberg, C. Johan; Urann, Ben (American Geophysical Union, 2018-12-05)This study reports the composition of the oceanic crust from the 16.5°N region of the Mid‐Atlantic Ridge, a spreading ridge segment characterized by a complex detachment fault system and three main oceanic core complexes ...
Canales, J. Pablo; Tucholke, Brian E.; Xu, Min; Collins, John A.; DuBois, David L. (American Geophysical Union, 2008-08-06)Long-lived detachment faults at mid-ocean ridges exhume deep-seated rocks to form oceanic core complexes (OCCs). Using large-offset (6 km) multichannel seismic data, we have derived two-dimensional seismic tomography models ...
Downward continued multichannel seismic refraction analysis of Atlantis Massif oceanic core complex, 30°N, Mid-Atlantic Ridge Henig, A. S.; Blackman, Donna K.; Harding, Alistair J.; Canales, J. Pablo; Kent, Graham M. (American Geophysical Union, 2012-05-19)Detailed seismic refraction results show striking lateral and vertical variability of velocity structure within the Atlantis Massif oceanic core complex (OCC), contrasting notably with its conjugate ridge flank. Multichannel ...