Is Myanmar jadeitite of Jurassic age? A result from incompletely recrystallized inherited zircon

Yui, Tzen‐Fu; Fukoyama, Mayuko; Iizuka, Yoshiyuki; Wu, Chao-Ming; Wu, Tian; Liou, J. G.; Grove, Marty

doi:10.1016/j.lithos.2012.12.011

Cited by 57 publications

(34 citation statements)

References 47 publications

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“…These zircons should be inherited (igneous) rather than metamorphic or metasomatic ones. In fact, Yui et al (2013) also found K-feldspar inclusions in zircons from the Myanmar jadeitite. K-feldspar is not a matrix mineral component in jadeitite studied and was interpreted as a phase in jadeitite's protolith.…”

Section: Criteria To Distinguish the Nature Of Zircons In Jadeititementioning

confidence: 89%

“…Theoretically, incompletely recrystallized inherited zircons in jadeitites would exhibit mixed features and have scattered U-Pb ages. Yui et al (2013) pointed out that the rate for texture change, for modification of geochemical compositions, as well as for resetting of U-Pb isotope system, during zircon recrystallization may not go ''in phase'' (see Fig. 6A and B).…”

Section: Criteria To Distinguish the Nature Of Zircons In Jadeititementioning

confidence: 99%

“…The protolith age and the age limit of the Yorii jadeite-quartz rock are in accord with the established tectonic framework of the area. Mori et al (2011) andYui et al (2012) for Tone jadeitites; and from Shi et al (2008), Qiu et al (2009), andYui et al (2013) for Myanmar jadeitites. In (C) all zircons are of metasomatic origin.…”

Section: The Yorii Jadeite-quartz Rockmentioning

confidence: 99%

“…It generally occurs as blocks, in association with high-pres sure/low-temperature rocks, within serpentinite (cf., Tsujimori and Harlow, 2012). Its genesis has attracted much attention recently (Tsujimori et al, 2005;Bröcker and Keasling, 2006;Shi et al, 2008Shi et al, , 2009Qiu et al, 2009;Fu et al, 2010Fu et al, , 2012Yui et al, 2010Yui et al, , 2012Yui et al, , 2013Meng et al, 2011;Mori et al, 2011;Cárdenas-Párraga et al, 2012;Schertl et al, 2012;Flores et al, 2013;Fukuyama et al, 2013). Two formation mechanisms have been proposed: the wholesale metasomatic replacement and the vein precipitation (Harlow et al, 2007(Harlow et al, , 2014(Harlow et al, , 2015Yui et al, 2010;Tsujimori and Harlow, 2012).…”

Section: Introductionmentioning

confidence: 99%

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A revisit to the Yorii jadeite–quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis

Yui

Fukuyama

2015

Journal of Asian Earth Sciences

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Section: Criteria To Distinguish the Nature Of Zircons In Jadeititementioning

confidence: 89%

Section: Criteria To Distinguish the Nature Of Zircons In Jadeititementioning

confidence: 99%

Section: The Yorii Jadeite-quartz Rockmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A revisit to the Yorii jadeite–quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis

Yui

Fukuyama

2015

Journal of Asian Earth Sciences

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“…Data source: N-MORB (McDonough and Sun, 1995); global subducted sediment (Plank and Langmuir, 1998); jadeitite from the Monviso meta-ophiolite (Compagnoni et al, 2012). (b) Chondrite normalized REE patterns of jadeite-quartz rocks comparing to jadeitites from the Monviso meta-ophiolite (Compagnoni et al, 2012), Tone, Japan (Yui et al, 2012), Myanmar (dashed line from Yui et al, 2013, shaded area from Shi et al, 2008, and Guatemala (Simons et al, 2010). Chondrite values are from McDonough and Sun (1995).…”

Section: Discussion Of Fluid Composition In Subduction Zonesmentioning

confidence: 99%

Chemical composition of fluid inclusions in the Yorii jadeite–quartz rocks from the Kanto Mountains, Japan

Fukuyama

Kawamoto

Ogasawara

2017

Journal of Mineralogical and Petrological Sciences

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Jadeite-quartz rocks from the Yorii area, the Kanto Mountains, central Japan occur as tectonic blocks within serpentinite mélange. Primary two-phase (liquid + vapor) aqueous fluid inclusions are observed in jadeite, quartz, albite and zircon. The fluids trapped in jadeite and quartz are H 2 O with and without CH 4 and show a wide range of salinity (4.7 ± 1.1 wt% NaCl eqv in jadeite; 3.4 ± 0.7 and 13.6 ± 2.0 wt% NaCl eqv in quartz). In this study, we examined the chemical composition of fluid inclusions in quartz from jadeite-quartz rock to understand the characteristics of fluid, which related to the formation of the rocks in the subduction zone. The trace element concentrations of fluid inclusions determined with LA-ICP-MS are enriched in LILE, Li, B, HFSE and transition metals with LILE enriched and relatively HFSE depleted characteristics. These have elemental patterns similar to the HFSE-depleted fluid released from antigorite during subduction, though the orders of magnitude are different. It can be common chemical characteristics of fluid in a subduction zone. There are two possibilities of the chemical composition of the evolved fluid after the formation of jadeite-quartz rocks. HFSE from the fluid can be sequestered into jadeite-quartz rock prior to fluids moving up into a mantle wedge. This process lead the evolved fluids relatively depleted in HFSE and enriched in LILE. Other possibility is that the fluid has same chemical composition of fluid inclusion as the fluid is equilibrated with jadeite-quartz rocks during the jadeite-quartz formation. In both cases, fluid after the metasomatic formation of jadeite-quartz rocks can be relatively enriched in LILE and depleted in HFSE. Magmas generated in subduction zones exhibit distinctive geochemical features of LILE enrichment and HFSE depletion and this characteristic of arc magma can be explained by the behavior of HFSE during the formation of jadeite-quartz rocks.

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Subduction versus non‐subduction origin of the Nagaland‐Manipur Ophiolites along the Indo‐Myanmar Orogenic Belt, northeast India: Fact and fallacy

et al. 2020

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The Nagaland‐Manipur Ophiolites (NMO) in northeast India is known for its complex geological history. Tough terrain, thick vegetation, and dismembered exposure of ophiolitic suite of rocks in the region made uneasy for geological investigation and put it in a deadlock for a long time. Only in the last decade has seen an appreciable amount of publications but the results boil down to a hot debate between two opposite schools of thoughts of subduction origin versus non‐subduction origin of the NMO. In this article, we revisit the literature data and compare it with our new geochemical data with an attempt to provide fresh insight into the long‐standing debate on the geodynamic evolution of the NMO. Our investigation arrives at the conclusion that the NMO as a whole cannot be considered as 100% subduction or 100% non‐subduction origin. It is indeed a combination of both. The non‐subduction group of mafic rocks shows a high ratio of incompatible elements (Nb/Yb >1), high‐Ti, enriched LILE, and HFSE with primitive mantle normalized values >5. Their bulk‐rock geochemical composition is equivalent to mid‐ocean ridge basalt (MORB) and ocean island basalt (OIB). The subduction group of rocks, on the other hand, shows a low ratio of incompatible elements (Nb/Yb <1), low‐Ti, depleted LILE, and HFSE with primitive mantle normalized values <1, affinity to the fore‐arc depleted N‐MORB type. Similarly, spinels present in subduction‐influenced mantle rocks show high chromium content (Cr# >50) but it is lower (Cr# <50) in non‐subduction abyssal peridotites of the NMO. Such geochemical variations cannot simply be explained by fractional crystallization or variable degree of partial melting of a single source, but rather signifies derivation from different tectonic settings of subduction and non‐subduction magma factories. We further conclude that the primary compressional force of India‐Myanmar Plate collision and secondary strike‐slip faults running along this ophiolite belt jeopardized the accretionary process which led to distortion and dismembering of the rocks like a scrambled bread.

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Is Myanmar jadeitite of Jurassic age? A result from incompletely recrystallized inherited zircon

Cited by 57 publications

References 47 publications

A revisit to the Yorii jadeite–quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis

A revisit to the Yorii jadeite–quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis

Chemical composition of fluid inclusions in the Yorii jadeite–quartz rocks from the Kanto Mountains, Japan

Subduction versus non‐subduction origin of the Nagaland‐Manipur Ophiolites along the Indo‐Myanmar Orogenic Belt, northeast India: Fact and fallacy

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