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Pyroxene polymorphs in melt veins of the heavily shocked Sixiangkou L6 chondrite
Zhang, Aicheng; Hsu, Weibiao; Wang, Rucheng; Ding, Mingwei
2006-11-01
Source PublicationEUROPEAN JOURNAL OF MINERALOGY
ISSN0935-1221
Volume18Issue:6Pages:719-726
AbstractSixiangkou is a heavily shocked L6 chondrite that contains numerous shock-induced melt veins with varying widths. This paper focuses on pyroxene polymorphs in shock-induced melt veins in the meteorite and discusses their implication to the high pressure and temperature conditions during impact metamorphism. The major high-pressure polymorphs are majorite and majorite-pyrope solid solution. Diopside, akimotoite and jadeite were also observed in melt veins of the Sixiangkou chondrite. Diopside coexists with ringwoodite (+ akimotoite) in coarse-grained fragments of the melt veins. Two mechanisms were proposed for the lack of phase transformation of diopside: a) low local temperature and b) a very sluggish transformation rate. Majorite and majorite-pyrope occur as coarse-grained polycrystalline and fine-grained solid solution. They were formed through solid state transformation and crystallized from a melt under pressures, respectively. Akimotoite coexists with low-Ca pyroxene in coarse-grained fragments of melt veins. They have nearly identical chemical compositions to the host low-Ca pyroxene, implying a solid state transformation mechanism. Jadeite appeared as fine-grained and was originated through retrograde transformation of lingunite under moderate post-shock pressure and high temperature conditions. The coexistence of different high-pressure pyroxene polymorphs reflects an inhomogeneous distribution of temperature in the shock-induced melt veins and a kinetic effect of phase transformations of minerals during shock metamorphism.
KeywordSixiangkou L6 Chondrite Heavily Shocked Melt Veins Akimotoite Phase Transformation
Subject AreaMineralogy
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1127/0935-1221/2006/0018-0719
WOS KeywordHIGH-PRESSURE PHASES ; DIOPSIDE CAMGSI2O6 ; METEORITE ; TRANSFORMATION ; CONSTRAINTS ; RINGWOODITE ; ASSEMBLAGE ; ENSTATITE ; MAJORITE ; OLIVINE
Indexed BySCI
Language英语
WOS Research AreaMineralogy
WOS SubjectMineralogy
WOS IDWOS:000243187900005
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/3596
Collection天体化学和行星科学实验室
Affiliation1.Purple Mt Observ, Lab Astrochem & Planetary Sci, Nanjing 210008, Peoples R China
2.Nanjing Univ, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China
3.Nanjing Univ, Dept Earth Sci, Nanjing 210093, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Aicheng,Hsu, Weibiao,Wang, Rucheng,et al. Pyroxene polymorphs in melt veins of the heavily shocked Sixiangkou L6 chondrite[J]. EUROPEAN JOURNAL OF MINERALOGY,2006,18(6):719-726.
APA Zhang, Aicheng,Hsu, Weibiao,Wang, Rucheng,&Ding, Mingwei.(2006).Pyroxene polymorphs in melt veins of the heavily shocked Sixiangkou L6 chondrite.EUROPEAN JOURNAL OF MINERALOGY,18(6),719-726.
MLA Zhang, Aicheng,et al."Pyroxene polymorphs in melt veins of the heavily shocked Sixiangkou L6 chondrite".EUROPEAN JOURNAL OF MINERALOGY 18.6(2006):719-726.
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