摘要
在大别山石马地区榴辉岩石榴石中包裹有与柯石英同期的绿辉石,据此,将这里的榴辉岩相变质作用划分为早期的柯石英榴辉岩阶段和晚期重结晶榴辉岩阶段。它们的P-T-t轨迹表明:产于片麻岩中的榴辉岩至少经历了两阶段的抬升过程:(1)在221Ma(印支期)时,由于陆壳俯冲所产生的大规模逆冲构造使其快速抬升;(2)在134Ma(燕山期)陆壳俯冲后的拉张抬升环境下,榴辉岩随山体一起缓慢上升。
Omphacite inclusions in garnet have been found in the eclogites from Shima, Dabie Mountains, Auhui. They are contemporaneous with coesites. The study shows that the eclogitc—facies metamorphism may be subdivided into two stages: coesite—facies metamorphism (early) and recrystallization-facics metamorphism (later). The P-T-t trajectories suggest that the eclogites occurred in gneiss experienced at least two stages in the processes of eclogites uplift: (1) the rapid uplift stage at 221 Ma, which maybe related with the melange; (2) the slowly rising stage at 134 Ma, accompanied by the upwarding of the root of subduction zone between the Sino—Korean and Yantze cratons.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1993年第3期239-250,共12页
Geotectonica et Metallogenia
基金
国家自然科学基金(编号4870188)
