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• W2022865523 endingPage "233" @default.
• W2022865523 startingPage "191" @default.
• W2022865523 abstract "Ocean Drilling Program Hole 735B was extended to 1508 m below the sea floor during Leg 176, atop a shallow bank near Atlantis II Fracture Zone on the very slowly spreading Southwest Indian Ridge. All the drilling was in gabbro, and recovery averaged nearly 87%. The drill penetrated a series of stacked plutons consisting mostly of olivine gabbro, but some with troctolite. Each pluton is some 200–500 m thick, each has its own internally coherent stratigraphy, and each apparently represents an individual event of significant magma inflation and addition to the crust. The entire column was extensively deformed along inclined zones of distributed shear before it was completely frozen, this marking the onset of unroofing of the rocks and their ascent to high rift mountains. The deformation mobilized late-stage melts into flow patterns which led to concentration of ilmenite and magnetite in hundreds of seams of oxide gabbro along or near zones of strong crystal–plastic deformation, the highly differentiated melts overall being concentrated by buoyancy forces toward the top of the section, especially in one zone nearly 70 m thick. However, upward flow was ultimately blocked or deflected by zones of impermeable rock resulting either from downward freezing or grain-size reduction during shear. A melt lens probably did not form at the base of sheeted dikes, as it does at the East Pacific Rise. Despite this, the rocks are cumulates, and most are adcumulates, with very low residual melt porosities. Cumulate theory based on stratiform, layered intrusions does not entirely apply to these rocks. Instead, all gabbros, including the oxide gabbros, crystallized in a dense crystal mush in patterns dominated by fractures, channelized flow, and intergranular porous flow. Most gabbros are not layered; weak modal layering of uncertain origin is present in <2% of the rocks. Porosity reduction leading to formation of adcumulates at all stages was extremely efficient. This occurred in the course of synkinematic differentiation, also called differentiation by deformation, and involved compaction under conditions of lithostatic loading and shear, emplacement of crystal mushes along inclined, possibly curving faults, dissolution and reprecipitation of minerals along grain boundaries, and pressure solution, which was the final agent in porosity reduction. As the block was lifted from beneath the rift-valley floor, crystal–plastic deformation gave way to brittle fracture, and the now dominantly subsolidus metamorphism shifted from high-temperature assemblages characterized by amphibole near the top of the section, to low-temperature assemblages with smectite–chlorite and zeolite near the bottom. The rocks acquired their stable magnetization during formation of amphiboles and secondary magnetite during this metamorphism. The entire body of rock is reversely stably magnetized at a consistent inclination, and it is rotated to the south, perhaps along a curving detachment surface, away from the ridge segment where it formed, by about 20°. It has an intensity of magnetization sufficient to account for the magnetic anomaly observed over the site. Drilling did not reach ultramafic rock, but dredging indicates that peridotite is probably within a few hundred meters of the bottom of the hole. Seismic Moho, however, is placed at 5 km beneath the summit of Atlantis Bank. Much of the rock between Moho and the bottom of Hole 735B must therefore be partially serpentinized peridotite." @default.
• W2022865523 created "2016-06-24" @default.
• W2022865523 creator A5028488670 @default.
• W2022865523 creator A5037001562 @default.
• W2022865523 date "2001-10-01" @default.
• W2022865523 modified "2023-10-16" @default.
• W2022865523 title "Formation of the lower ocean crust and the crystallization of gabbroic cumulates at a very slowly spreading ridge" @default.
• W2022865523 cites W182031297 @default.
• W2022865523 cites W1964315624 @default.
• W2022865523 cites W1968409119 @default.
• W2022865523 cites W1970768454 @default.
• W2022865523 cites W1979105698 @default.
• W2022865523 cites W1982384435 @default.
• W2022865523 cites W1984373451 @default.
• W2022865523 cites W1988263641 @default.
• W2022865523 cites W1990814837 @default.
• W2022865523 cites W1993032961 @default.
• W2022865523 cites W1996154638 @default.
• W2022865523 cites W1999516718 @default.
• W2022865523 cites W2000168556 @default.
• W2022865523 cites W2003244251 @default.
• W2022865523 cites W2004266487 @default.
• W2022865523 cites W2005354462 @default.
• W2022865523 cites W2007711398 @default.
• W2022865523 cites W2009762462 @default.
• W2022865523 cites W2010292438 @default.
• W2022865523 cites W2011786681 @default.
• W2022865523 cites W2013676877 @default.
• W2022865523 cites W2014332508 @default.
• W2022865523 cites W2014623771 @default.
• W2022865523 cites W2033774424 @default.
• W2022865523 cites W2039132692 @default.
• W2022865523 cites W2040049557 @default.
• W2022865523 cites W2046192843 @default.
• W2022865523 cites W2046727007 @default.
• W2022865523 cites W2050189782 @default.
• W2022865523 cites W2056014008 @default.
• W2022865523 cites W2057568261 @default.
• W2022865523 cites W2058780954 @default.
• W2022865523 cites W2060930762 @default.
• W2022865523 cites W2062644817 @default.
• W2022865523 cites W2063436373 @default.
• W2022865523 cites W2068129705 @default.
• W2022865523 cites W2069550459 @default.
• W2022865523 cites W2074942724 @default.
• W2022865523 cites W2076375680 @default.
• W2022865523 cites W2076576809 @default.
• W2022865523 cites W2076755830 @default.
• W2022865523 cites W2080973789 @default.
• W2022865523 cites W2085195127 @default.
• W2022865523 cites W2086712362 @default.
• W2022865523 cites W2087748612 @default.
• W2022865523 cites W2090319023 @default.
• W2022865523 cites W2091474042 @default.
• W2022865523 cites W2093516388 @default.
• W2022865523 cites W2097094305 @default.
• W2022865523 cites W2097274806 @default.
• W2022865523 cites W2098352994 @default.
• W2022865523 cites W2099529855 @default.
• W2022865523 cites W2107316430 @default.
• W2022865523 cites W2107820993 @default.
• W2022865523 cites W2111830717 @default.
• W2022865523 cites W2118437845 @default.
• W2022865523 cites W2124972127 @default.
• W2022865523 cites W2126671525 @default.
• W2022865523 cites W2132069601 @default.
• W2022865523 cites W2134749399 @default.
• W2022865523 cites W2141723634 @default.
• W2022865523 cites W2142733361 @default.
• W2022865523 cites W2144711339 @default.
• W2022865523 cites W2145299240 @default.
• W2022865523 cites W2156218776 @default.
• W2022865523 cites W2156263353 @default.
• W2022865523 cites W2156827464 @default.
• W2022865523 cites W2160978379 @default.
• W2022865523 cites W2161484974 @default.
• W2022865523 cites W2163625375 @default.
• W2022865523 cites W2163963449 @default.
• W2022865523 cites W2164374997 @default.
• W2022865523 cites W2283296551 @default.
• W2022865523 cites W2314628990 @default.
• W2022865523 cites W2319427992 @default.
• W2022865523 cites W2320631089 @default.
• W2022865523 cites W236674498 @default.
• W2022865523 cites W2376796155 @default.
• W2022865523 cites W2412188116 @default.
• W2022865523 cites W306621583 @default.
• W2022865523 cites W4241551012 @default.
• W2022865523 cites W4255546529 @default.
• W2022865523 doi "https://doi.org/10.1016/s0377-0273(01)00211-6" @default.
• W2022865523 hasPublicationYear "2001" @default.
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