pT evolution of the Yuqia eclogite in northern Qaidam Mountains
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P588.3

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    Abstract:

    In the Yuqia area within the western segment of northern Qaidam Mountains, eclogite lenses and interlayers are enclosed within metapelites, granitic gneisses and small amounts of marbles. Eclogite is composed of garnet and omphacite with varying amounts of amphibole, phengite, zoisite (clinozoisite or epidote), rutile and quartz. Petrography, mineral chemistry indicate that theeclogites record a three-stage evolution connected to Early Paleozoic burial and subsequent exhumation: (1) The prograde stage is composed of garnet cores and large amounts of mineral inclusions including amphibole, epidote and plagioclase. pT estimates give metamorphic conditions of 1.06~1.11 GPa and 560~577℃.(2) The eclogite facies stage is characterized by the assemblages of oriented omphacite, phengite, barroisite and zoisite around garnet porphyroblasts. The assemblages record peak conditions of 2.35~2.51 GPa and 610~680℃.(3) Retrograde assemblages are recognized in amphibolitized eclogite along the eclogite boudin margin. The assemblages of garnet, amphibole and plagioclase record retrograde conditions of 1.09±0.12 GPa and 630±44℃.It is inferred that there existed ahairpin-shaped p-Tpath, and all this suggests that the Yuqia eclogites underwent an evolutionary history of rapid burial and uplift.

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张建新 孟繁聪 杨经绥,2005,柴北缘鱼卡榴辉岩的pT演化历史[J].岩石矿物学杂志,24(4):245~254. ZHANG Jian_xin, MENG Fan_cong, YANG Jing_sui,2005,pT evolution of the Yuqia eclogite in northern Qaidam Mountains[J]. Acta Petrologica et Mineralogica,24(4):245~254.

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