摘要
甘孜—理塘构造带由于大面积为三叠系地层覆盖而难以对其下覆的地层进行研究 ,导致了人们对甘孜—理塘构造带的构造演化认识产生很大分歧。通过对劳改皮沉积混杂岩体的地层学、生物学、沉积学和岩石化学等方面的研究 ,认为甘孜—理塘构造带三叠系盖层之下可能存在大面积的泥盆系、甚至上古生界的深水沉积。进而得出甘孜—理塘洋的演化历史应该向前推移到早泥盆世 ,而不是通常所说的晚二叠世。同时指出 ,沉积混杂岩是研究隐伏基底的重要窗口。
It is difficult to study the stratification under the Triassic in Garze Litang tectonic belt because it is covered widely by Triassic.Thus this results in different opinions about the tectonic evolution of this area.Our study of the stratigraphy,paleontology,sedimentation and petrochemistry of Laogaipi sedimentary melange body which occurred in the middle of Hagong Formation reveals that a large number of deep water sediments of Devonian and/or even of late Paleozoic could have existed under Triassic.Accordingly the writers think that Garze Litang Ocean should have formed in the early Devonia,rather than late Permian which is common knowledge of people.Meanwhile,they point out that the sedimentary melange is an important window to study the concealed basement.
出处
《地质科技情报》
EI
CAS
CSCD
北大核心
2000年第3期17-20,共4页
Geological Science and Technology Information
基金
国土资源部"1: 5万中甸幅
霞若幅区域地质调查"项目
关键词
沉积混杂岩
深水沉积
泥盆系
甘孜-理塘构造带
sedimentary melange
deep water sediment
Devonia
Garze Litang tectonic belt
