Uplift age of Keluo Complex at Nenjiang Area, Heilongjiang Province

详细信息   

• 责任者：Liang Chenyue (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Liu Yongjiang
• 刊名：Chinese Journal of Geology
• 出版年：2012
• 卷期：47(2)
• 关键词：变质核杂岩 ; metamorphic core complexes ; 黑龙江省 ; Heilongjiang Province
• 页码：p.360-375
• 图表：illus., 2 tables, 79 refs.
• 分类号：0802
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

Keluo complex at Nenjiang area in Heilongjiang Province is located in the northern part of the Da Hinggan Mountains. Based on the detailed field works and structural analysis we found that the Keluo complex have been suffered a large scale extensional sliding and formed a detachment structure with top to south-east. According to the feldspar-quartz micro-texture analysis ,we inferred that the deformation temperature of the extensional sliding is about 300℃ to 450℃. The ⁴⁰Ar/³⁹Ar measurement of biotite from the granitic gneiss samples yield plateau ages of 118.39 to 117.37 Ma,these ages indicate that the deformation time of the extensional sliding zone is in the late Early Cretaceous period. Combining the characteristics of the Mesozoic magmatism and comparative study of surrounding metamorphic core complexes in Da Hinggan Mountains,we suggested that the whole Da Hinggan Mountains underwent rapid uplift in middle-late Early Cretaceous and forming a series of metamorphic core complexes,the large- scale extensional deformation in this period had a good coupling relationship in time with the depressed period of Songliao Basin.