大别山南部高压-超高压变质地体中云母片岩和片麻岩的相平衡研究

doi:10.3321/j.issn:1000-0569.2005.06.013

CORC > 北京大学 > 地球与空间科学学院

	大别山南部高压-超高压变质地体中云母片岩和片麻岩的相平衡研究; Phase equilibria of mica-schists and gneisses in the HP-UHP belt of southern Dabie Shan.
	陈燕 ; 魏春景 ; 张景森 ; 初航
刊名	岩石学报
	2005
关键词	云母片岩和片麻岩相平衡 PTt 轨迹多硅白云母地质压力计大别山 mica-schists and gneisses phase equilibrium PTt path phengite geollarometer Dabieshan
DOI	10.3321/j.issn:1000-0569.2005.06.013
英文摘要	对于大别山高压-超高压变质带中大面积出露的云母片岩和片麻岩的变质条件和演化历史有不同的认识:如中低压绿帘角闪岩相,高压角闪岩相和超高压榴辉岩相。通过对大别山南部超高压榴辉岩区、高压榴辉岩区和宿松变质杂岩带中的云母片岩和片麻岩进行详细的岩相学及相平衡研究表明:它们的变质条件分别为610℃～690℃,1.2～1.4Ga;590～600℃、1.3～1.5GPa;520～590℃,0.9～1.4GPa,相当于高压绿帘角闪岩相、高压角闪岩相与榴辉岩相之间的过渡。依据超高压榴辉岩区绿帘石黑云片麻岩中的石榴石环带特征推测,它们很可能经过超高压变质阶段,现有矿物组合记录了抬升阶段的条件。但是高压榴辉岩区的石榴...; There have been controversial opinions oil the extensively distributed mica-schists and gneisses in the Dabieshan HP-UHP terranes: Some geologists believe that most of the mica-schists and gneisses are only metamorphosed to epidote-aniphibolite facies; and the others suggest that they have been subjected to HP amphibolite facies or UHP metamorphism together with the eclogites. Oil the basis of study on the petrography and phase equilibria for the mica-schists and gneisses from the UHP eclogite terrane, HP eclogite terrane and the Susong metamorphic complexes, the P-T conditions of these mica-schists and gneisses were calculated as 610 similar to 690 degrees C at 1.2 similar to 1.4GPa; 590 similar to 600 degrees C at 1.3 similar to 1.5GPa and 520 similar to 590 degrees C at 0.9 similar to 1.4GPa, respectively, equivalent to the transitions among HP epidote-amphibolite, HP amphibolite and eclogite facies. According to the garnet zonal characters in the epidote-biotite gneisses from the UHP eclogite terrane, it is inferred that these gneisses may have experienced UHP metamorphism, and the present mineral assemblage has recorded a PT condition of uplifting. However, the garnet zonations from the garnet-epidote mica gneiss in the HP eclogite terrane and the garnet-mica schists in the Susong complexes indicate that the existing mineral assemblages in these rocks have recorded the peak metamorphic PT conditions and it is impossible for them to have experienced UHP metamorphism. lit addition, contours of the Si content in phengite in the KFMSH pseudosections show that the pliengite Si contents could be used as a geobarometer in most mineral assemblages, but both Si contents and slopes of Si isopleths are dependent of mineral assemblages.; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 0; 06; 1657-1668; 21
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/226951]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	陈燕,魏春景,张景森,等. 大别山南部高压-超高压变质地体中云母片岩和片麻岩的相平衡研究, Phase equilibria of mica-schists and gneisses in the HP-UHP belt of southern Dabie Shan.[J]. 岩石学报,2005.
APA	陈燕,魏春景,张景森,&初航.(2005).大别山南部高压-超高压变质地体中云母片岩和片麻岩的相平衡研究.岩石学报.
MLA	陈燕,et al."大别山南部高压-超高压变质地体中云母片岩和片麻岩的相平衡研究".岩石学报 (2005).