A transitional eclogite- to high pressure granulite-facies overprint on coesite–eclogite at Taohang in the Sulu ultrahigh-pressure terrane, Eastern China

Yao, Yupeng; Yang, Kai; Liu, Jingbo; Cong, Bin; Wang, Qingchen

doi:10.1016/s0024-4937(99)00087-0

Cited by 85 publications

(76 citation statements)

References 25 publications

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“…Rocks drilled through by CCSD ever resided in the deep level of mantle beneath the convergent plate boundary, which is the best area to study the continental subduction and geodynamics [1,2] . Recent studies reveal that the eastmost Sulu UHP rocks suffered partial melting during exhumation [3] , and some eclogites in the eastern Shandong were overprinted by granulite-facies metamorphism [4][5][6][7] . Then, one important question is what causes the partial melting.…”

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“…To answer this question, decompression, increasing temperature and adding volatile were ever suggested. Yao et al [7] attributed overprinting of granulite-facies metamorphism on eclogites to fluid infiltration during the exhumation. However, P-T path of coesite eclogite to granulite indicates that the overprinting of granulite-facies metamorphism was associated with heating, and the extent of temperature increasing was ~40℃ [4] .…”

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Trace elemental records of short-lived heating during exhumation of the CCSD eclogites

Zong

Liu

et al. 2007

CHINESE SCI BULL

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Trace element compositions of garnet, omphacite and apatite in ultrahigh-pressure eclogites from the main hole of the Chinese Continental Scientific Drilling (CCSD) project were in situ analyzed by the LA-ICP-MS method. Although both garnet and omphacite have homogeneous major element compositions, their trace elements show zonations from core to rim in rare earth elements. In particular, middle rare earth elements in the garnet, heavy rare earth elements in the apatite and all rare earth elements in the omphacite increase from core to rim, respectively. Based on dependence of partition coefficients on temperature and pressure in these minerals, we suggest that the trace elemental zonations in these minerals may record a short-lived heating event during exhumation. eclogite, in situ analysis, trace element, mineral zoningThe Sulu ultrahigh pressure (UHP) metamorphic belt is an important part of the Qinling-Dabie Central Orogenic Belt in China. The main hole of the Chinese Continental Scientific Drilling (CCSD) is located at Donghai County, the southwestern part of the Sulu UHP terrain. Rocks drilled through by CCSD ever resided in the deep level of mantle beneath the convergent plate boundary, which is the best area to study the continental subduction and geodynamics [1,2] . Recent studies reveal that the eastmost Sulu UHP rocks suffered partial melting during exhumation [3] , and some eclogites in the eastern Shandong were overprinted by granulite-facies metamorphism [4][5][6][7] . Then, one important question is what causes the partial melting. To answer this question, decompression, increasing temperature and adding volatile were ever suggested. Yao et al. [7] attributed overprinting of granulite-facies metamorphism on eclogites to fluid infiltration during the exhumation. However, P-T path of coesite eclogite to granulite indicates that the overprinting of granulite-facies metamorphism was associated with heating, and the extent of temperature increasing was ~40℃ [4] . O'Brien and Vrána [8] suggested that a short-lived heating event during exhumation resulted in overprinting of granulite-facies metamorphism on the UHP eclogites in the Moldanubian Zone. The presence of corundumbearing mafic and ultramafic rock is an indicator of ultrahigh temperature [9][10][11][12] . In the Sulu UHP belt, corundum is found in eclogite enclosed in ultramafic rocks [13] and garnetite in garnet peridotite [14] . Especially, we recently found a unique mineral assemblage (garnet + corundum + spinel + quartz + feldspar) indicating (ultra-) high temperature nearby the CCSD. These observations imply that the eclogites in some parts of the Sulu UHP terrane could suffer a short-lived high-T stage during the exhumation.The thermodynamic theory of trace element partitioning between metamorphic minerals indicates that compared with major elements, trace elements are potentially more sensitive to chemical and thermobaromet-

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Trace elemental records of short-lived heating during exhumation of the CCSD eclogites

Zong

Liu

et al. 2007

CHINESE SCI BULL

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“…According to this idea, celestine might be stable even under high -P conditions. Celestine is also reported from the Taohang area of the Sulu region in China, where it occurs as inclusions in omphacite of UHP eclogite (Yao et al, 2000), although no detailed descriptions are given. Anhydrite typically develops in evaporites and as a product of hydrothermal alteration (e.g., Deer et al, 1992).…”

Section: Discussionmentioning

confidence: 99%

Sr-sulphate and associated minerals found from kyanite-bearing eclogite in the Moldanubian Zone of the Bohemian Massif, Czech Republic

Nakamura

Kobayashi

Shimobayashi

et al. 2010

Journal of Mineralogical and Petrological Sciences

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Sr -sulphate, celestine, was newly found in a kyanite -bearing eclogite associated with the Nové Dvory peridotite mass in the Moldanubian Zone of the Bohemian Massif, Czech Republic. Celestine is closely associated with anhydrite, pyrite, pyrrhotite and chalcopyrite, and those minerals occur in the matrix, where fine -grained omphacite aggregate and kelyphites after garnet develop. A common Sr reservoir in eclogite is known to be epidote, but the maximum pressure -temperature (P -T) conditions of the studied eclogite was estimated as about 1050 -1150 °C, 4.5 -4.9 GPa. In such extremely high P -T conditions, epidote should be unstable. In fact, epidote is absent from most of eclogites in the Moldanubian Zone of Czech Republic. These facts suggest that a Sr -reservoir after the epidote -breakdown in subducting eclogite might be celestine, or its high -P polymorph, although the formation stage of celestine in the study sample and maximum stability limits of celestine are not known. Another idea is that celestine in the study sample was formed at relatively shallow levels after the ascent of the eclogite. In this case, omphacite and apatite would have contained significant amount of Sr under the eclogitefacies conditions. Otherwise, metasomatic infiltration of Sr -rich fluids into the eclogite is necessary for the formation of celestine in order to provide sufficient amount of Sr. A Ba -rich alumino -silicate, probably celsian, was also found as a retrograde product around pyrrhotite in kelyphite and in symplectites mainly composed of augite and plagioclase after omphacite. Several grains of biotite are also present along the margin of garnet and in the symplectites after omphacite. In addition, small amounts of muscovite and amphibole are present in the symplectites after omphacite. These findings suggest that metasomatism with Sr -and Ba -rich fluids may have occurred during decompression of the eclogite and may not be indicative of the UHP history of these rocks.

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“…Rongchen P-Tpath (Sulu) taken from Yao et al [33]; Weihai (Z) (Sulu) from Zhang et al [34]; Weihai (W) from Wang et al [35]; Zhu-Jia-Chong (Dabie) from Castelli et al [36]; Bibong (South Korea) from Oh et al [37]. …”

Section: 石榴石mentioning

confidence: 99%

Investigation of Northeast Extension and Geological Evolution of the Sulu-Dabie High-Pressure Metamorphic Belt

尹¹

2016

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The Qianliyan Island locates at the northern Yellow Ocean about 80 km east from Qingdao, which develops lenses and layers of eclogite. The Qianliyan Island has been considered as the marine extension of the Dabie-Sulu orogen by comparing these two geological settings, especially their eclogites characteristics, such as mineral assemblages and compositions, temperature and pressure conditions, P-T path and geochronology. Based on textures and mineral compositions, three metamorphic stages were distinguished. The first stage is symbolized by the peak metamorphic assemblage of Grt-Omp-Ph-Rt in ecologite, T = 775˚C, P = 2.6 GPa. The second stage is represented by the retrograde assemblage amphibole + albite which form the symplectites around omphacite in eclogite, T = 740˚C~790˚C, P = 1.60~1.75 GPa. The third stage is symbolized by the actinolite appearing as a symbol of greenschist facies. The metamorphic age of the Qianliyan eclogite is documented at the age of the late Triassic ~222 Ma, consistent with those from Dabie-Sulu eclogites. It is proposed that the Qianliyan Island not only is the marine extension of the Dabie-Sulu orogen, but also may be the connecting part between Hongsong, South Korea, and the Dabie-Sulu orogen of China.

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A transitional eclogite- to high pressure granulite-facies overprint on coesite–eclogite at Taohang in the Sulu ultrahigh-pressure terrane, Eastern China

Cited by 85 publications

References 25 publications

Trace elemental records of short-lived heating during exhumation of the CCSD eclogites

Trace elemental records of short-lived heating during exhumation of the CCSD eclogites

Sr-sulphate and associated minerals found from kyanite-bearing eclogite in the Moldanubian Zone of the Bohemian Massif, Czech Republic

Investigation of Northeast Extension and Geological Evolution of the Sulu-Dabie High-Pressure Metamorphic Belt

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