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研究发现,与大别-苏鲁超高压变质带中多硅白云母往往含过剩Ar不同,石马地区榴辉岩中多硅白云母基本不含过剩Ar。阐述了其原因,并进而探讨了超高压带中变质流体运移的特点。切穿石马地区榴辉岩及其围岩的白云母石英细脉的年龄表明,南大别超高压变质带角闪岩相退变质作用应结束在180 Ma前,而不会更晚。
The study found that, unlike the superb Arbosilicites in the Dabie-Sulu EHV metamorphic belt, the overburden Ar is often different, and the Silicalite in the eclogites of Shima region contains almost no excess Ar. The reasons are explained, and then the characteristics of metamorphic fluid migration in the UHP belt are discussed. The ages of the muscovite quartz veins cut through the eclogite and its surrounding rocks in the Shima area indicate that the metamorphism of the amphibolite in the UHP metamorphic belt of the Dabie Depression should be terminated before 180 Ma and not later.