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The origin of serpentinite from Hero Fracture zone in Drake passage, Antartic

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Title
The origin of serpentinite from Hero Fracture zone in Drake passage, Antartic
Other Titles
남극 드레이크해협 히어로 파쇄대 사문암의 기원
Authors
Lee, Seok Hoon
Kil, Young-woo
Jin, Young Keun
Lee, Jong Ik
Subject
Geology
Keywords
Antarctic; Hero Fracture zone; Peridotite
Issue Date
2005
Citation
Lee, Seok Hoon, et al. 2005. "The origin of serpentinite from Hero Fracture zone in Drake passage, Antartic". The Geological Society Of Korea, 41: 157-173.
Abstract
Serpentinites from Hero Fracture zone in Antarctic contain serpentine, amphibole, talc, chlorite, and magnetite as well as olivine, pyroxene, and spinel as relict minerals. Fosterite compositions of olivines in serpentinites are 89 - 90. Cr-numbers and Mg-numbers of spinels in serpentinites are similar to those of spinels in abyssal peridotite. Serpentinites from Hero Fracture zone in Drake Passage have undergone two serpentinization events by oceanic water;first serpentinization event and second serpentinization event. First serpentinization part includes lizardite and antigorite, but second serpentinization part includes only lizardite. First serpentinization event occurred at deeper part (150 - 450oC) than second serpentinization event. During serpentinization, MgO and FeO in olivine are decreased, and those in orthopyroxene and clinopyroxene are increased. The protholith of serpentinites is upper mantle spinel peridotite because of mineral assemblage, Fo89-90 composition in olivines, and Cr-number and Mg-number in spinels. Moreover, the values of (HREE)n (0.3 - 1.6) and no Eu anomaly in serpentinites from Hero Fracture zone indicate that the protholith of serpentinites is upper mantle spinel peridotite.
URI
http://repository.kopri.re.kr/handle/201206/5960
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