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Minerals 2018, 8(12), 583; https://doi.org/10.3390/min8120583

Occurrence of Felsic Rocks in Oceanic Gabbros from IODP Hole U1473A: Implications for Evolved Melt Migration in the Lower Oceanic Crust

1
Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa Ishikawa 920-1192, Japan
2
Faculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, Vietnam
3
College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa Ishikawa 920-1192, Japan
4
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road Kolkata, West Bengal 700019, India
5
Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba Ibaraki 305-8567, Japan
6
Centre de Recherches Pétrographiques et Géochimiques (UMR 7358), CNRS, Université de Lorraine, 54501 Vandœuvre les Nancy, France
7
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
8
Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33156, USA
9
Department of Earth Science and Environment, University of Pavia, 27100 Pavia, Italy
10
School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place Cardiff, Wales CF10 3AT, UK
11
International Ocean Discovery Program, Texas A&M University, 1000 Discovery Drive, College Station, TX 77845-9547, USA
12
Department of Geology and Geophysics, Woods Hole Oceanographic Institution, MS #8, McLean Laboratory, Woods Hole, MA 02543-1539, USA
*
Authors to whom correspondence should be addressed.
Received: 12 October 2018 / Revised: 4 December 2018 / Accepted: 7 December 2018 / Published: 10 December 2018
(This article belongs to the Special Issue Igneous Rocks: Minerals, Geochemistry and Ore Potential)
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Abstract

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. View Full-Text
Keywords: IODP; hole U1473A; Atlantis Bank; gabbros; felsic veins; melt-rock interactions; oceanic plagiogranite IODP; hole U1473A; Atlantis Bank; gabbros; felsic veins; melt-rock interactions; oceanic plagiogranite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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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. Occurrence of Felsic Rocks in Oceanic Gabbros from IODP Hole U1473A: Implications for Evolved Melt Migration in the Lower Oceanic Crust. Minerals 2018, 8, 583.

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