针对鄂尔多斯盆地西南缘奥陶系平凉组重力流沉积类型及特征进行了研究。通过露头、薄片及粒度分析等资料分析可知:1)研究区岩石类型丰富,发育砾屑灰岩、泥晶灰岩、砂屑灰岩、砾岩、砂岩及泥岩等。沉积构造丰富,块状层理、粒序层理、交...针对鄂尔多斯盆地西南缘奥陶系平凉组重力流沉积类型及特征进行了研究。通过露头、薄片及粒度分析等资料分析可知:1)研究区岩石类型丰富,发育砾屑灰岩、泥晶灰岩、砂屑灰岩、砾岩、砂岩及泥岩等。沉积构造丰富,块状层理、粒序层理、交错层理、平行层理及槽模等发育。2)东部为碳酸盐岩沉积区,中部为碎屑岩沉积区,西部为碳酸盐沉积区。3)重力流沉积可分为块状搬运复合体(mass transport deposits,MTD)、碎屑流沉积及浊流沉积。MTD以砾屑灰岩及泥晶灰岩为主,变形构造发育,规模大小不一。碎屑流沉积以砾屑灰岩、砾岩为主,块状层理发育,少见粒序层理,呈层状及透镜状,为海底扇内扇-中扇及水道沉积。浊流沉积以砂岩及砂屑灰岩为主,交错层理、平行层理及槽模等极为发育,构成不完整的鲍玛序列,多呈层状及透镜状。4)东部以MTD及深水水道沉积体系为主,中部发育海底扇,包括大型水道及朵叶,西部朵叶沉积较为发育,沉积物分选及磨圆较好。展开更多
Nano-sized Al/SiC powders were prepared by mechanical alloying method. Two sorts of SiC particle, i.e., nano-sized and popular micron-sized SiC were utilized. The particle size and microstructure of the milled powder ...Nano-sized Al/SiC powders were prepared by mechanical alloying method. Two sorts of SiC particle, i.e., nano-sized and popular micron-sized SiC were utilized. The particle size and microstructure of the milled powder were characterised. Effects of the particle size and agglomerate state of SiC, as well as the microstructure of Al/SiC nanocomposite were studied by SEM and TEM. The results show that nano-sized SiC particles is dispersed in aluminium uniformly after ball milled for only 2 h, whereas the similar process need about 10 h for popular micron-sized SiC particle. The bulk Al/SiC nanocomposite can be fabricated by hot pressing the nano-sized Al/SiC powders at temperature about 723 K under pressure of 100 MPa.展开更多
文摘针对鄂尔多斯盆地西南缘奥陶系平凉组重力流沉积类型及特征进行了研究。通过露头、薄片及粒度分析等资料分析可知:1)研究区岩石类型丰富,发育砾屑灰岩、泥晶灰岩、砂屑灰岩、砾岩、砂岩及泥岩等。沉积构造丰富,块状层理、粒序层理、交错层理、平行层理及槽模等发育。2)东部为碳酸盐岩沉积区,中部为碎屑岩沉积区,西部为碳酸盐沉积区。3)重力流沉积可分为块状搬运复合体(mass transport deposits,MTD)、碎屑流沉积及浊流沉积。MTD以砾屑灰岩及泥晶灰岩为主,变形构造发育,规模大小不一。碎屑流沉积以砾屑灰岩、砾岩为主,块状层理发育,少见粒序层理,呈层状及透镜状,为海底扇内扇-中扇及水道沉积。浊流沉积以砂岩及砂屑灰岩为主,交错层理、平行层理及槽模等极为发育,构成不完整的鲍玛序列,多呈层状及透镜状。4)东部以MTD及深水水道沉积体系为主,中部发育海底扇,包括大型水道及朵叶,西部朵叶沉积较为发育,沉积物分选及磨圆较好。
文摘Nano-sized Al/SiC powders were prepared by mechanical alloying method. Two sorts of SiC particle, i.e., nano-sized and popular micron-sized SiC were utilized. The particle size and microstructure of the milled powder were characterised. Effects of the particle size and agglomerate state of SiC, as well as the microstructure of Al/SiC nanocomposite were studied by SEM and TEM. The results show that nano-sized SiC particles is dispersed in aluminium uniformly after ball milled for only 2 h, whereas the similar process need about 10 h for popular micron-sized SiC particle. The bulk Al/SiC nanocomposite can be fabricated by hot pressing the nano-sized Al/SiC powders at temperature about 723 K under pressure of 100 MPa.
