Onset and Progression of Serpentinization and Magnetite Formation in Olivine-rich Troctolite from IODP Hole U1309D

Beard, James S.; Frost, B. Ronald; Fryer, Patricia; McCaig, A. M.; Searle, R. C.; Ildefonse, Benoı̂t; Zinin, Pavel V.; Sharma, Sanjay K.

doi:10.1093/petrology/egp004

Cited by 168 publications

(200 citation statements)

References 27 publications

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“…In addition, olivine -rich rocks usually undergo multistage serpentinization (cf. Beard et al, 2009), which makes the analysis of the elementary processes of serpentinization difficult. Olivine and other phases (especially orthopyroxene) are expected to play different roles in serpentinization, and it is difficult to distinguish these phases by ordinary microscopic analysis.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy of hydrous inclusions in olivine and orthopyroxene in ophiolitic harzburgite: Implications for elementary processes in serpentinization

Miura

Arai

Mizukami

2011

Journal of Mineralogical and Petrological Sciences

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Secondary microinclusions in olivine and orthopyroxene in a harzburgite sample obtained from northern Oman ophiolite were examined by micro -Raman spectroscopy. The microinclusions were a consequence of fluid inclusions trapped by the minerals during the healing of fluid -filled cracks. We can expect an almost closed -system reaction to have occurred between the fluid and minerals. We attempted to distinguish the individual contributions of olivine and orthopyroxene to the serpentinization of peridotite. The inclusions in olivine mainly consist of lizardite and brucite with small amounts of magnetite, H 2 , and CH 4 , while those in orthopyroxene mainly consist of talc and chromian spinel with or without CH 4 and graphite. The fluid involved was most probably a mixture of H 2 O and a smaller amount of CO 2 . We examined whether reduced gases were produced through reactions of the fluid with olivine and orthopyroxene. The role of magnetite (or magnetite component in chromian spinel) is of vital importance in the generation of these gases. Orthopyroxene facilitates the formation of talc in the serpentinization of peridotite.

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Section: Introductionmentioning

confidence: 99%

Raman spectroscopy of hydrous inclusions in olivine and orthopyroxene in ophiolitic harzburgite: Implications for elementary processes in serpentinization

Miura

Arai

Mizukami

2011

Journal of Mineralogical and Petrological Sciences

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“…Petrographic observations strongly suggest that these veins are not ordinary veins solidified from penetrating silicate melts but are imprints left along the pathways of metasomatic fluids in primary host minerals (Maeda et al, 2002 (Alt and Shanks, 2003;Luguet et al, 2003), ODP Hole 1274A (Alt et al, 2007;Seyler et al, 2007), and TAG hydrothermal field (Dekov, 2006) on the MAR. The formation of the Ni -Fe alloy during serpentinization can be explained as follows (e.g., Chamberlain et al, 1965;Filippidis, 1985): (1) Beard et al (2009) reported the formation of a Ni -Fe alloy during serpentinization of olivine -rich rocks (olivine -rich troctolite suite including dunitic and wehrlitic rocks, Blackman et al, 2006) at 1095 mbsf in Hole U1309D. This formation can be explained by the abovementioned steps.…”

Section: Discussionmentioning

confidence: 99%

Ni-Fe alloy possibly associated with reduced magmatic fluids in lower-crustal gabbro, IODP Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

Niino

Maeda

Yamasaki

et al. 2009

Journal of Mineralogical and Petrological Sciences

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A Ni -Fe alloy (Ni 3.8 Fe 0.1 Co 0.1 ) was found in olivine -poor gabbro recovered from the Integrated Ocean Drilling Program (IODP) Hole U1309D, Atlantis Massif, 30°N on the Mid -Atlantic Ridge. Ni -Fe alloys are one of the unique minerals formed during serpentinization; however, our finding establishes that Ni -Fe alloys are also formed in the gabbroic crust possibly associated with extremely reduced magmatic fluids. The occurrence of the Ni -Fe alloy suggests that oceanic lower -crustal gabbros as well as serpentinites may be potential reservoirs of abiogenic CH 4 .

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“…Frost and Beard, 2007;Frost et al, 2008;Nozaka et al, 2008;Beard et al, 2009;Nozaka and Flyer, 2011;Tutolo et al, 2016 Frost andBeard, 2007;Frost et al, 2008;Beard et al, 2009Tutolo et al 2016200°C Nozaka et al, 2008Nozaka and Flyer, 2011Fig. 8 Nozaka and Flyer, 2011Niino et al 2009 Al Locations of sites 894, 895, and U1415 are shown.…”

Section: U1309mentioning

confidence: 98%

Drilling into deep-seated hard rocks of the oceanic plate formed at the Mid-Ocean Ridge: results and future perspectives: Deep-seated Hard Rock Drilling

Morishita

2017

Jour. Geol. Soc. Japan

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Onset and Progression of Serpentinization and Magnetite Formation in Olivine-rich Troctolite from IODP Hole U1309D

Cited by 168 publications

References 27 publications

Raman spectroscopy of hydrous inclusions in olivine and orthopyroxene in ophiolitic harzburgite: Implications for elementary processes in serpentinization

Raman spectroscopy of hydrous inclusions in olivine and orthopyroxene in ophiolitic harzburgite: Implications for elementary processes in serpentinization

Ni-Fe alloy possibly associated with reduced magmatic fluids in lower-crustal gabbro, IODP Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

Drilling into deep-seated hard rocks of the oceanic plate formed at the Mid-Ocean Ridge: results and future perspectives: Deep-seated Hard Rock Drilling

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