Transitions among Mariana-,Japan-,Cordillera-and Alaska-type are systems and their final juxtapositions leading to accretionary and collisional orogenesis
会议名称：《中国科学院地质与地球物理研究所第十届(2010年度)学术年会》
会议日期：2011年
学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学]
基 金：supported by the Chinese 973 Programme(2007CB411307) the National Natural Science Foundation of China (40725009) the Hong Kong Research Grants Council(HKU7043/07P)
摘 要：’Arc system’ is used here as a collective term for a variety of arcs that occur along continental margins or in oceanic plates;it includes associated units from adjacent *** major arc systems(Mariana-,Japan-,Cordillera-and Alaska-type)can be distinguished along the Circum-Pacific *** Japan-type arc systems in ancient orogens(*** Altaids) may have been largely regarded as microcontinents because they have so-called Precambrian basement. Often the Cordillera-type arc systems can be very complicated,and if they are rifted away from the host continent they become more difficult to *** these arc systems interact mutually and with continental marginal sequences,leading to complicated accretionary and colhsional *** alternation between Western Pacific archipelagos and the Eastern Pacific active margin is the stereotype of accretionary and colhsional *** importantly, these four main types of arc systems can be juxtaposed into a final orogenic collage, which is another main expression of accretionary *** some parts of accretionary and colhsional orogens can be terminated by attachment of a continent-size craton such as Tarim or even India,and even so the accretionary and colhsional processes may continue elsewhere along *** significance of the interactions among these arc systems and their final juxtaposition has not been fully appreciated in ancient *** Altaids together with the Circum-Pacific orogens offers a good opportunity to study such accretionary-collisional orogenesis.