Ba minerals in clinopyroxene rocks from the Myanmar jadeitite area: implications for Ba recycling in subduction zones

Shi, Gongle; Jiang, Neng; Wang, Yuwang; Zhao, Xianzheng; Wang, Xia; Li, Guowu; Ng, Enoch; Cui, Wenyuan

doi:10.1127/0935-1221/2010/0022-1998

Cited by 30 publications

(10 citation statements)

References 89 publications

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“…3A). In some cases, actinolite was cut by tiny crosscutting, needle-like barite crystals, suggesting that these nephrites had experienced latestage replacement by actinolite, as well as infiltration of Ba-rich fluids, similar to that of jadeite jade (e.g., Shi et al, 2010).…”

Section: Tremolitementioning

confidence: 97%

Geochemistry and petrology of nephrite from Alamas, Xinjiang, NW China

Yan

Deng

Shi

et al. 2011

Journal of Asian Earth Sciences

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Section: Tremolitementioning

confidence: 97%

Geochemistry and petrology of nephrite from Alamas, Xinjiang, NW China

Yan

Deng

Shi

et al. 2011

Journal of Asian Earth Sciences

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“…The source for the required aqueous solution rich in Na, Al, and Si but poor in K is still not fully understood, however. By far the most revealing evidence, the finding of Ba minerals in the Guatemala, Japanese and Myanmar jadeitites (Harlow, 1995;Morishita, 2005;Shi et al, 2010), suggests that jadeitite-forming materials might have been derived from subducted oceanic crust. However those Ba minerals have undergone multiple chemical reactions, thus the evidences are indirect.…”

Section: Implications For Petrogenesis Of the Jadeititementioning

confidence: 95%

Spherules with pure iron cores from Myanmar jadeitite: Type-I deep-sea spherules?

Shi

Zhu

Deng

et al. 2011

Geochimica et Cosmochimica Acta

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“…Furthermore, Kfeldspar embedded in the sodic plagioclase rims is rich in BaO (up to 13.8 wt.%; Table S1). The formation of Ba-rich K-feldspar is generally thought to occur by aqueous fluids (Harlov et al, 1998;Henry & Will, 2015;Moro et al, 2001;Shi et al, 2010).…”

Section: Nature Of Active Hp Fluidmentioning

confidence: 99%

High‐Pressure Fluid‐Rock Interaction and Mass Transfer During Exhumation of Deeply Subducted Rocks: Insights From an Eclogite‐Vein System in the Ultrahigh‐Pressure Terrane of the Dabie Shan, China

Liu

Massonne

Harlov

et al. 2019

Geochem Geophys Geosyst

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A petrological study was performed on an eclogite-vein system from the Dabie ultrahigh-pressure terrane by focusing on high-pressure (HP) fluid-rock interaction and mass transfer during exhumation. The veins comprise mainly garnet and quartz and resulted from a HP leaching process along fractures in the eclogite during exhumation. Relict peak garnet, phengite, and apatite in this rock system were altered by HP fluids forming characteristic compositional zonings. Zoned garnet in the eclogite records an isothermal exhumation from 3.3 GPa and 665-680°C. Partial dissolution of garnet and a back incorporation of Mn-heavy rare earth element (REE)-Y increased the content of these elements in the altered garnet zone in the veins. Altered phengite is characterized by a Ba-rich rim. Fluid-aided alteration reduced the light REE (LREE) contents and produced oriented monazite, calcite, and pyrrhotite inclusions within apatite, reflecting mobilization and redistribution of LREEs, CO 3 2− , Fe, and S between these minerals. The active HP fluid is proposed to have been a Si-Al-Na-Ba-rich aqueous fluid, as indicated by sodic plagioclase rims around various eclogitic minerals and by the altered phengite composition. Mass balance calculations reveal that LREEs, middle REEs, and Zr-Hf-Th-U were added to and Li, large ion lithophile elements, and Ti-Nb were removed from the quartz-garnet veins, requiring a high fluid flux. These findings shed new light on the nature and behavior of HP fluids and highlight their key role in resetting mineral chemistry and mass transfer in subduction zone metamorphic environments. . (2019). High-pressure fluid-rock interaction and mass transfer during exhumation of deeply subducted rocks: insights from an eclogite-vein system in the ultrahigh-pressure terrane of the Dabie The Dabie-Sulu orogenic belt in east-central China is considered to be one of the largest UHP terranes on Earth. This belt resulted from the Triassic continental collision between the North China and South China blocks (Ernst et al., 2007;Li et al., 1993;Zhang et al., 2009). It is separated into the eastern Sulu terrane and the western Dabie terrane by the sinistral Tanlu strike-slip fault. The western part of the Dabie terrane is further truncated by the Shangma fault and known as the Hongan terrane (Figure 1a).Several large-scale EW trending faults divide the Dabie terrane into five major lithotectonic units with different metamorphic histories (Hacker et al., 2000;Zheng et al., 2005). From north to south, these units are (1) the Beihuaiyang greenschist-facies unit made up of low-grade metasedimentary and metaigneous rocks that are overlain by Jurassic-Cretaceous sedimentary and volcanic rocks; (2) the North Dabie high-T granulite-facies unit composed of typical amphibolite-to granulite-facies rocks, migmatitic gneisses, and minor mafic to ultramafic rocks; (3) the Central Dabie medium-T/UHP eclogite-facies unit including abundant orthogneisses and paragneisses that enclose subordinate bodies of coesite-bearing eclogite, pure to imp...

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Ba minerals in clinopyroxene rocks from the Myanmar jadeitite area: implications for Ba recycling in subduction zones

Cited by 30 publications

References 89 publications

Geochemistry and petrology of nephrite from Alamas, Xinjiang, NW China

Geochemistry and petrology of nephrite from Alamas, Xinjiang, NW China

Spherules with pure iron cores from Myanmar jadeitite: Type-I deep-sea spherules?

High‐Pressure Fluid‐Rock Interaction and Mass Transfer During Exhumation of Deeply Subducted Rocks: Insights From an Eclogite‐Vein System in the Ultrahigh‐Pressure Terrane of the Dabie Shan, China

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