四川炉霍-道孚构造带“如年各岩组”研究进展

Advances in Research into the Runiange Formation in the Luhuo-Dawu Structure Zone, Sichuan

通过1∶50 000炉霍县幅区域地质调查详细填图工作,如年各岩组主要为一套整体有序,局部无序(滑塌沉积混杂无序)的地层。碳酸盐外来滑塌岩块、火山喷发混杂造成地层中新的砂泥质沉积与早期成岩的碳酸盐岩块分属不同时代,但这属于沉积混杂,排除外来岩块,砂泥质基质仍然是成层有序的,无论是野外还是室内,均未发现砂泥质基质有类似佛朗西斯科混杂岩的剪切现象(后期鲜水河断裂的破坏不在此列),排除了其蛇绿岩组合的可能。

1：50 000 Luhuo Sheet regional geological survey reveals that the Runiange Formation is a set of strata of general order, partial disorder（slump deposits mixed chaotic）. Enthetic carbonate slump block and volcanic olistostrome as well as diagenetic carbonate block belong to sedimentary mélange without Francisco mélange shear phenomenon. Therefore, it is not an ophiolitic mélange.