CAJ | 학술논문

托赖岩群是浪士当沟地区变质基底的重要组成部分,其泥质、长英质变质岩大多为铝过饱和型和SiO2过饱和的岩石,轻重稀土间分馏较强,Eu亏损明显;铁镁质变质岩石以高钛、高碱、低硅为特征,大部分岩石SiO2不饱和,稀土配分图上显示较弱的分异模式. 通过原岩恢复认为托赖岩群的原岩建造为一套以泥质、泥砂岩沉积碎屑岩类为主,夹碳酸盐岩和中基性火山岩的岩石组合;沉积构造环境应为活动陆缘伸展型裂陷盆地. 采用LA-ICP-MS锆石U-Pb定年法,获得托赖岩群黑云斜长片麻岩的年龄为1537.0±5.3Ma,表明托赖岩群的成岩年龄可能下沿至中元古代.
탁뢰암군시랑사당구지구변질기저적중요조성부분,기니질、장영질변질암대다위려과포화형화SiO2과포화적암석,경중희토간분류교강,Eu우손명현;철미질변질암석이고태、고감、저규위특정,대부분암석SiO2불포화,희토배분도상현시교약적분이모식. 통과원암회복인위탁뢰암군적원암건조위일투이니질、니사암침적쇄설암류위주,협탄산염암화중기성화산암적암석조합;침적구조배경응위활동륙연신전형렬함분지. 채용LA-ICP-MS고석U-Pb정년법,획득탁뢰암군흑운사장편마암적년령위1537.0±5.3Ma,표명탁뢰암군적성암년령가능하연지중원고대.
Tuolai Group is an important part of the regional metamorphic basement in Langshidanggou area.the mud, quar-tzofeldspathic rocks are mostly aluminum saturation and supersaturation of SiO2 rock, fractionation between LREE and HREE is stronger, Eu losses significantly; mafic metamorphic rocks features high titanium, high alkali and low silicon , with most of the rock SiO2 unsaturated, REE fractionation patterns shown weak fractionation.The original rock recovery sug-gested that the protoliths of the Tuolai Group consists of a set of mud, mud sandstone sedimentary clastic rock ,clip car-bonate rocks and basic volcanic rocks in the rock combination;sedimentary tectonic environment was an active continental margin extensional rift basin.LA-ICP-MS zircon U-Pb dating method was used, to obtain biotite plagioclase gneiss age of Tuolaiduo group was 1537+5.3Ma, showing that the diagenetic age of the Tuolai Group may be sretched to mesoproterozo-ic.