CAJ | 학술논문

通过对川西盆地下自垩统古流向的研究发现,川西盆地东缘早白垩世早期沉积的平均古流向为142°～145°,中、晚期沉积的平均古流向则为264°～288°,说明古流向发生了逆变.下白垩统泥质岩稀土、微量元素丰度的纵向变化表明,与此古流向逆变过程相对应沉积层段的元素丰度,也产生了明显的相对异常.这一地球化学异常既为该古流向逆变的存在提供了进一步的佐证,也揭示了该现象具有很好的、区域性的沉积地球化学响应.
통과대천서분지하자성통고류향적연구발현,천서분지동연조백성세조기침적적평균고류향위142°～145°,중、만기침적적평균고류향칙위264°～288°,설명고류향발생료역변.하백성통니질암희토、미량원소봉도적종향변화표명,여차고류향역변과정상대응침적층단적원소봉도,야산생료명현적상대이상.저일지구화학이상기위해고류향역변적존재제공료진일보적좌증,야게시료해현상구유흔호적、구역성적침적지구화학향응.
The studies on the palaeocurrent of the Lower Cretaceous in the western Sichuan Basin reveal that in the eastern margin area of the basin, the vector mean of palaeocurrent direction in sediments of the early Early Cretaceous is from 142° to 145°, and in the middle-and-late Early Cretaceous sediments is from 264° to 288°. The results indicate that an inversion of palaeocurrent direction happened during this period. At the same time, the vertical abundance variation of trace elements and rare earth elements of the Lower Cretaceous argillaceous rocks in this basin shows that some elements have obviously relative abundance anomaly in corresponding sediments of this inversion. Such a geochemical anomaly not only provides further evidence for the existence of this inversion, but also reveals that it has a strong and regional sedimentary geochemical response.