Exsolution microstructures in ultrahigh-pressure rocks: Progress, controversies and challenges

Liu, Liang; Yang, Jin‐Hui; Zhang, Junfeng; Chen, Danling; Wang, Chao; Yang, Wei

doi:10.1007/s11434-009-0204-5

Cited by 21 publications

(23 citation statements)

References 78 publications

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“…These include HP and UHP ultramafic bodies dominated by garnet peridotites. These rocks have attracted much attention recently as a potential source of information on relatively deep mantle processes such as accretion of lithospheric roots, transport, reaction and storage of fluids/melts in suprasubduction mantle wedges, and subduction/exhumation mechanisms Brueckner and Medaris, 2000;Brueckner et al, 2004;Ernst and Liou, 2008;Green et al, 1997;Green et al, 2010;Katayama et al, 2003Katayama et al, , 2005Kotkova et al, 2011;Liou et al, 2002aLiou et al, ,b, 2007Liou et al, , 2009Liu et al, 2007Liu et al, , 2009MacKenzie et al, 2005;Malaspina et al, 2009Malaspina et al, , 2010Paquin et al, 2004;Sapienza et al, 2009;Scambelluri et al, 2006Scambelluri et al, , 2008Scambelluri et al, , 2010Song et al, 2004;van Roermund et al, 2001;Yoshida et al, 2004;Zhang and Liou, 1998;Zhang et al, 2005;Zhang et al, 2003Zhang et al, , 2004aZheng et al, 2003Zheng et al, , 2011. Numerous studies were published, mostly in the last decade, providing data on the petrology, geochronology, and geochemistry of HP/UHP garnet peridotites and related rocks from four principal regions: Liati and Gebauer, 2009;Medaris et al, 1995Medaris et al, , 2005Medaris et al, , 2006Massonne and Bautsch, 2002;Masso...…”

Section: Orogenic Peridotite Massifsmentioning

confidence: 99%

Orogenic, Ophiolitic, and Abyssal Peridotites

Bodinier

Godard

2014

Treatise on Geochemistry

189

148

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Section: Orogenic Peridotite Massifsmentioning

confidence: 99%

Orogenic, Ophiolitic, and Abyssal Peridotites

Bodinier

Godard

2014

Treatise on Geochemistry

189

148

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“…Quantitative knowledge on the microstructure of silica precipitates in clinopyroxene is a stepping stone to address their origin (Dobrzhinetskaya and Faryad, 2011;Liu et al, 2009). Wang et al (2003) reported two orientations of quartz needles/rods with their long axes subparallel to (100) and (101) of the host clinopyroxene using a universal Stage (U-stage).…”

Section: Introductionmentioning

confidence: 99%

Quartz exsolution topotaxy in clinopyroxene from the UHP eclogite of Weihai, China

Zhang

Zong

et al. 2015

Lithos

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“…LA-ICP-MS or SHRIMP in situ zircon U-Pb dating (Table 3) shows that the metamorphic age of the Guanpo eclogite is 507±37 (Yang et al, 2002b) or 505±12 Ma (Liu et al, 2009b), and the protolith age is >750 Ma. In the Songshugou area, the metamorphic age of the basic granulite is 485±3.3 Ma (Chen et al, 2004), that of the amphibole eclogite is 514±9 (SHRIMP) or 500±10 Ma (LA-ICP-MS) (Liu et al, 2009b), and the protolith age is >720 Ma.…”

Section: North Qinlingmentioning

confidence: 99%

“…In the Songshugou area, the metamorphic age of the basic granulite is 485±3.3 Ma (Chen et al, 2004), that of the amphibole eclogite is 514±9 (SHRIMP) or 500±10 Ma (LA-ICP-MS) (Liu et al, 2009b), and the protolith age is >720 Ma. The metamorphic age of the Zhaigen garnet pyroxenite is 500±6 Ma (Liu et al, 2009b). Accordingly, the metamorphic ages of the various HP-UHP rocks in various areas of the North Qinling are 485-514 Ma.…”

Section: North Qinlingmentioning

confidence: 99%

“…Isomorphism and exsolution are very common for many rock-forming minerals. For recognition of microstructures of exsolution as indicators of UHP conditions and pressure estimation, it is crucial to understand the crystallochemical behavior of the host minerals under high temperature and pressure condition (Liu et al, 2009b). However, there are only a few minerals (such as garnet, pyroxene and olivine) that have been investigated with the solubility of some isomorphic components or chemical compositions under high temperature and pressure conditions.…”

Section: Petrological Evidence For Continental Ultra-deep Subduction mentioning

confidence: 99%

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Progress and controversy in the study of HP-UHP metamorphic terranes in the West and Middle Central China orogen

et al. 2010

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During the past ten years, various types of HP-UHP metamorphic rocks have been discovered in the South Altyn Tagh, the North Qaidam and the North Qinling (秦岭) in the West and Middle Central China orogen. The UHP rocks, as lentoid bodies in regional gneisses, include eclogite (garnet-bearing pyroxenite), garnet peridotite and various pelitic or felsic gneisses. There are many records of minerals and microstructures of exsolution indicate the UHP metamorphism, such as coesite (or its pseudomorph), diamond, exsolution of clinopyroxene/amphibole/+rutile or rutile+quartz+apatite in garnet, exsolution of quartz in omphacite and exsolution of kyanite+spinel in precursor stishovite. The discovery of microstructure evidence for the presence of precursor stishovite in typical Alrich gneiss from the South Altyn Tagh reveals continental subduction and exhumation to and from a depth of more than 350 km. It is the petrological record of the deepest subduction and exhumation of continental rock in the world. The in situ zircon U-Pb dating using LA-ICP-MS or SHRIMP methods shows that the metamorphic ages of the HP-UHP rocks in the South Altyn Tagh, the North Qaidam and the North Qinling are 475-509, 420-457, and 485-514 Ma, respectively. The metamorphic ages of HP-UHP rocks in the North Qaidam are 20-80 Ma younger than those in the South Altyn Tagh and the North Qinling, and the metamorphic ages do not systematically increase or decrease from the South Altyn Tagh through the North Qaidam to the North Qinling. The absence of time transgressive variety of the metamorphism in the three regions does not support the hypothesis that the HP-UHP rocks in these regions form the same HP-UHP metamorphic zone. And the HP-UHP rocks in these regions can not be simply correlated to the collision between the North China plate and the South China plate. At present, the study of the HP-UHP rocks in the West and Middle Central China orogen faces several key issues or challenges, such as: (1) the continental subduction to the mantle depth of stishovite stability field (>9 GPa) is occasional or universal; (2) the mechanism of exhumation for the continental rocks subducted to the depth of stishovite stability field (>300 km); (3) the tectonic setting and geodynamical mechanism of producing the HP-UHP metamorphic zones in the South Altyn Tagh, the North Qaidam and the North Qinling. Further studies aiming at these problems will make important progress not only in metamorphism of the HP-UHP rocks in the West and Middle Central China orogen, but also in continental deep subduction and exhumation in solid earth science. It will also contribute to the establishment of the theory of continental deep subduction. KEY WORDS: HP-UHP metamorphic zone, continental deep subduction, zircon LA-ICP-MS and SHRIMP dating, South Altyn Tagh, North Qaidam, North Qinling.

show abstract

Exsolution microstructures in ultrahigh-pressure rocks: Progress, controversies and challenges

Cited by 21 publications

References 78 publications

Orogenic, Ophiolitic, and Abyssal Peridotites

Orogenic, Ophiolitic, and Abyssal Peridotites

Quartz exsolution topotaxy in clinopyroxene from the UHP eclogite of Weihai, China

Progress and controversy in the study of HP-UHP metamorphic terranes in the West and Middle Central China orogen

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