Transition-Zone mineral assemblages in peridotite massifs, Tibet Implications for collision-zone dyn

来源 :International Workshop on: Ophiolites, Mantle Processes and | 被引量 : 0次 | 上传用户：wuliaocanglang

【摘要】

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Diamonds have been reported from Tibetan “ophiolites” for ≥30 years,but have been widely dismissed as contaminants,because their unusual morphology and light

【作者】

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GRIFFIN W.L. MCGOWAN N.M. GONZALEZ-JIMENEZ J.M. BELOUSOVA Elena HOWELL AFONSO J.C. YANG J.S. SHI R. O'REILLY Suzanne Y. PEARSON N.J.

【机构】

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CCFS/GEMOC,EarthandPlanetarySciences,MacquarieUniversity,NSW2109AustraliaStateKeyLaboratoryforContin

【出处】

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International Workshop on: Ophiolites, Mantle Processes and

【发表日期】

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2014年4期

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Diamonds have been reported from Tibetan “ophiolites” for ≥30 years,but have been widely dismissed as contaminants,because their unusual morphology and light C(d13C=-18 to-27)are unlike those of kimberlitic diamonds.However,the diamonds have now been found in situ in both the chromitites andthe peridotites of “ophiolites” along the Yarlung-Zangbo suture(Tibet)and the Polar Urals [5].These massifs are dominated by depleted spinel harzburgite; some yield whole-rock Re-Os TRD ages back to 3.4 Ga [2],suggesting ancient SCLM.

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Transition-Zone mineral assemblages in peridotite massifs, Tibet Implications for collision-zone dyn

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