ANALYSIS ON THE METAMORPHOSED SEQUENCE OF METAMORPHIC ROCKS,A CASE STUDY OF LIAOHE GROUP
ANALYSIS ON THE METAMORPHOSED SEQUENCE OF METAMORPHIC ROCKS,A CASE STUDY OF LIAOHE GROUP
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发表时间：
1999
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通讯作者：
Guo-Xi Hong
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作者：
Guo-Xi Hong
辽河群出露于辽西地区，是一套典型的早元古代成矿岩系，矿产资源丰富。辽河Meta系经历了中浅变质作用，变质地温梯度为23.58~24.40℃/ km，变质类型为中低压相系的过渡类型，辽河群经历了三期变形，第一期为韧性伸展构造，第二期为公爵推覆构造，第三期为韧性剪切构造，第四期为韧性剪切构造，第五期为韧性剪切构造。第三幕变形为局部断裂、小型韧性剪切带和扭折带，辽河群虽有三幕变形，但只有一次热事件。1900 Ma时，吕梁运动的变质变形作用使辽河群固结硬化为结晶基底。对辽河群变质带的研究表明，变质矿物的结晶时间与变质带密切相关，在不同变质带中，同种变质矿物的结晶开始和结束时间不同，即不同变质带具有不同的P-T-t轨迹。
Liaohe Group has been outcropping in the west of Liaoning province, which is a typical Early Proterozoic metalmorphic rock series with abundant mineral resources. Liaohe Group meta morphic rock series had been subjected medium shallow metamorphism , which the metamorphic geothermal gradient was 23.58～24.40℃/ km , metamorphic type is the transitional type from medi um to low pressure facies series.Liaohe Group had experienced three episodes of deformation :the first episode of deformation was ductile extensional tectonics;the second episode of deformation was duc tile nappe tectonics;the third episode of deformation was faults at local,and small scale ductile shear belts and kinking belts.Although in Liaohe Group there were three episodes of deformation , there was only one thermal event. The metamorphism and deformation, as a part of Luliang movement, caused Liaohe Group consolidating and hardening into a crystalline basement in 1900 Ma . The studies on the metamorphic belts in Liaohe Group show that the crystallization time of metamor phosed minerals have a close correlation with the metamorphic belts.In different metamorphic belts, the same kind of metamorphosed minerals are different either in the beggining and ending time of crystallization ,that is to say ,different metamorphic belts have different P T t paths.