Details
| Original language | English |
|---|---|
| Article number | 6342 |
| Journal | Scientific reports |
| Volume | 4 |
| Publication status | Published - 11 Sept 2014 |
Abstract
Axial melt lenses sandwiched between the lower oceanic crust and the sheeted dike sequences at fast-spreading mid-ocean ridges are assumed to be the major magma source of oceanic crust accretion. According to the widely discussed "gabbro glacier" model, the formation of the lower oceanic crust requires efficient cooling of the axial melt lens, leading to partial crystallization and crystal-melt mush subsiding down to lower crust. These processes are believed to be controlled by periodical magma replenishment and hydrothermal circulation above the melt lens. Here we quantify the cooling rate above melt lens using chemical zoning of plagioclase from hornfelsic recrystallized sheeted dikes drilled from the East Pacific at the Integrated Ocean Drilling Program Hole 1256D. We estimate the cooling rate using a forward modelling approach based on CaAl-NaSi interdiffusion in plagioclase. The results show that cooling from the peak thermal overprint at 1000-1050°C to 600°C are yielded within about 10-30 years as a result of hydrothermal circulation above melt lens during magma starvation. The estimated rapid hydrothermal cooling explains how the effective heat extraction from melt lens is achieved at fast-spreading mid-ocean ridges.
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In: Scientific reports, Vol. 4, 6342, 11.09.2014.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Rapid hydrothermal cooling above the axial melt lens at fast-spreading mid-ocean ridge
AU - Zhang, Chao
AU - Koepke, Juergen
AU - Kirchner, Clemens
AU - Götze, Niko
AU - Behrens, Harald
N1 - Funding Information: The samples used in this study were provided by the Integrated Ocean Drilling Program (IODP). The shipboard crew of IODP Expeditions 312 and 335 are thanked for cooperation and discussion. We thank F. Spear and T. Müller for helpful discussions on modelling method. This research was supported by the Deutsche Forschungsgemeinschaft (KO 1723/ 12-1, 2).
PY - 2014/9/11
Y1 - 2014/9/11
N2 - Axial melt lenses sandwiched between the lower oceanic crust and the sheeted dike sequences at fast-spreading mid-ocean ridges are assumed to be the major magma source of oceanic crust accretion. According to the widely discussed "gabbro glacier" model, the formation of the lower oceanic crust requires efficient cooling of the axial melt lens, leading to partial crystallization and crystal-melt mush subsiding down to lower crust. These processes are believed to be controlled by periodical magma replenishment and hydrothermal circulation above the melt lens. Here we quantify the cooling rate above melt lens using chemical zoning of plagioclase from hornfelsic recrystallized sheeted dikes drilled from the East Pacific at the Integrated Ocean Drilling Program Hole 1256D. We estimate the cooling rate using a forward modelling approach based on CaAl-NaSi interdiffusion in plagioclase. The results show that cooling from the peak thermal overprint at 1000-1050°C to 600°C are yielded within about 10-30 years as a result of hydrothermal circulation above melt lens during magma starvation. The estimated rapid hydrothermal cooling explains how the effective heat extraction from melt lens is achieved at fast-spreading mid-ocean ridges.
AB - Axial melt lenses sandwiched between the lower oceanic crust and the sheeted dike sequences at fast-spreading mid-ocean ridges are assumed to be the major magma source of oceanic crust accretion. According to the widely discussed "gabbro glacier" model, the formation of the lower oceanic crust requires efficient cooling of the axial melt lens, leading to partial crystallization and crystal-melt mush subsiding down to lower crust. These processes are believed to be controlled by periodical magma replenishment and hydrothermal circulation above the melt lens. Here we quantify the cooling rate above melt lens using chemical zoning of plagioclase from hornfelsic recrystallized sheeted dikes drilled from the East Pacific at the Integrated Ocean Drilling Program Hole 1256D. We estimate the cooling rate using a forward modelling approach based on CaAl-NaSi interdiffusion in plagioclase. The results show that cooling from the peak thermal overprint at 1000-1050°C to 600°C are yielded within about 10-30 years as a result of hydrothermal circulation above melt lens during magma starvation. The estimated rapid hydrothermal cooling explains how the effective heat extraction from melt lens is achieved at fast-spreading mid-ocean ridges.
UR - http://www.scopus.com/inward/record.url?scp=84923367371&partnerID=8YFLogxK
U2 - 10.1038/srep06342
DO - 10.1038/srep06342
M3 - Article
AN - SCOPUS:84923367371
VL - 4
JO - Scientific reports
JF - Scientific reports
SN - 2045-2322
M1 - 6342
ER -