Transitions among Mariana-, Japan-, Cordillera- and Alaska-type arc systems and their final juxtapositions leading to accretionary and collisional orogenesis
Transitions among Mariana-, Japan-, Cordillera- and Alaska-type arc systems and their final juxtapositions leading to accretionary and collisional orogenesis
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DOI：
10.1144/sp338.3
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
W. Xiao;Chunming Han;C. Yuan;M. Sun;Guochun Zhao;Y. Shan
中科院分区：
文献类型：
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作者：
W. Xiao;Chunming Han;C. Yuan;M. Sun;Guochun Zhao;Y. Shan
摘要“岛弧系”是指沿着大陆边缘或大洋板块中的各种岛弧的总称，它包括相邻板块的伴生单元。环太平洋沿着可划分出马里亚纳型、日本型、科迪勒拉型和阿拉斯加型四种主要岛弧体系。古造山带中的一些日本型岛弧系统（如阿尔泰造山带），由于它们具有所谓的前寒武纪基底，因此在很大程度上可能被认为是微大陆。通常，科迪勒拉型岛弧系统可能非常复杂，如果它们离开主大陆，它们就变得更加难以识别。这些岛弧体系相互作用，并与大陆边缘层序相互作用，形成复杂的增生造山带和碰撞造山带。西太平洋群岛与东太平洋活动边缘的交替是增生碰撞造山作用的典型代表。更重要的是，这四种主要类型的岛弧体系可以并列成一个最终的造山拼贴，这是增生造山作用的另一种主要表现。只有部分增生和碰撞造山带可以被一个大陆大小的克拉通（如塔里木，甚至印度）的附着所终止，即使如此，增生和碰撞过程也可能沿沿着走向在其他地方继续进行。这些岛弧系统之间的相互作用及其最终并列的意义在古代造山带中尚未得到充分认识。阿尔泰造山带与环太平洋造山带一起为研究这种增生-碰撞造山作用提供了很好的机会。
Abstract ‘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 plates. Four major arc systems (Mariana-, Japan-, Cordillera- and Alaska-type) can be distinguished along the Circum-Pacific region. Some Japan-type arc systems in ancient orogens (e.g. the 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 recognize. Commonly these arc systems interact mutually and with continental marginal sequences, leading to complicated accretionary and collisional orogens. The alternation between Western Pacific archipelagos and the Eastern Pacific active margin is the stereotype of accretionary and collisional orogenesis. More importantly, these four main types of arc systems can be juxtaposed into a final orogenic collage, which is another main expression of accretionary orogenesis. Only some parts of accretionary and collisional orogens can be terminated by attachment of a continent-size craton such as Tarim or even India, and even so the accretionary and collisional processes may continue elsewhere along strike. The significance of the interactions among these arc systems and their final juxtaposition has not been fully appreciated in ancient orogens. The Altaids together with the Circum-Pacific orogens offers a good opportunity to study such accretionary–collisional orogenesis.