There is a zone of blastomylonites containing hornblende gneisses of Lewisian Inlier type in the northeast - east of Yell , Shetland . This zone with a north - northwesterly trend consists of blastomylonised hornblend...There is a zone of blastomylonites containing hornblende gneisses of Lewisian Inlier type in the northeast - east of Yell , Shetland . This zone with a north - northwesterly trend consists of blastomylonised hornblende - banded gneiss , hornblende - feldspar gneiss and mica - felsic - gneiss with lenses of hornblende gneiss . It is indicated that the blastomylonite zone is actually a ductile shear zone and the sense of shear is dextral . This contributes to understanding the details of tectonic evolution in this area , and this zone is probably a part of tectonic system of the British Caledonides .展开更多
文摘There is a zone of blastomylonites containing hornblende gneisses of Lewisian Inlier type in the northeast - east of Yell , Shetland . This zone with a north - northwesterly trend consists of blastomylonised hornblende - banded gneiss , hornblende - feldspar gneiss and mica - felsic - gneiss with lenses of hornblende gneiss . It is indicated that the blastomylonite zone is actually a ductile shear zone and the sense of shear is dextral . This contributes to understanding the details of tectonic evolution in this area , and this zone is probably a part of tectonic system of the British Caledonides .
