摘要
十余年来，全球构造的核心课题是各期超级大陆的复原或再造。为了鉴别散布全球各地的克拉通、造山带及裂谷带是否具有亲缘关系，本文应用了地质DNA的概念。一个古老的陆壳块体必然会有许多独特的标志，类似于生物学领域的遗传基因，在母体分裂解体和离散之后被保留在子体之中。根据地质DNA的对比和异同，笔者确定华泰克拉通来源于Rodinia，并给出了其后续演化历程的路线图和时间表。与前人结论不同的是，华北地台、西伯利亚地台和劳伦古陆三者共同构成的古劳亚大陆不是Rodinia的一部分，而是与其并存的另一联合古陆。SWEAT设想的误区在于将落基山带代表整个北美，实际上就劳伦古陆和北美地台而言，落基山带只是一个外来移植地体。后者与华泰克拉通一样，均为Rodinia的组成部分。华泰与华北二克拉通的拼接，以及落基山带与北美地台的拼接，都是全球性的古劳亚与Rodinia构造拼接的组成部分。生物地层学的研究表明，此次拼接发生于536Ma前后，这是形成真正超级大陆Pannotia的重大地质事件。寒武纪末期（510Ma）Pannotia解体，原来的古劳亚大陆携带着华泰克拉通和落基山带，与古冈瓦纳大陆分离，并在其间的地域形成了南太平洋。直到奥陶纪晚期（440Ma前后），古劳亚大陆分裂，华泰与华北二克拉通作为一个整体漂离加拿大地盾和北美内陆地台，同时形成北太平洋。所以，太平洋的形成不是原设想的720Ma，而是510-440Ma之后。
In recent 10 years,the reconstruction of supercontinent at various time has been always a key task. The present paper adopts geological DNA ideas in order to distinguish consanguinity between the cratons,orogenic behs and rifts of wide distribution in the whole world. There are certainly many distinctive features as a sign of every ancient continental crust block that are similar to the genetic factors of biology. After breakup and separation of the original continent （mother＇s body）, these signs are retained in the descendants（ continental blocks）. According to the similarities and differences of geological DNA, the author considers that the Huatai Craton is originated form Rodinia, and also reproduced itinerary and timetable of the continued evolutionary course. It is different from previous conclusions. Plaeo-Laurasia composed of North China Craton,Siberia Platform and Laurentia is not a part of Rodinia but is another coexistent uint continent. There is an error in the SWEAT hypothesis that takes Rocky Mts. as the whole North America. Actually Rocky Mts. is only an external immigrant terrene with regard to Laurentia and North America Interior Platform. Both the Rocky Mts. and Huatai Craton are all members of Rodinia. The butt joints between both the North China and Huatai Cratons, and between the North American Platform and Rocky Mts. terrene, are all component parts of the global tectonic aggregate zone between Plaeo-Laurasia and Rodinia. The studies of biostratigraphy are indicated that this butt joint occurs at ca.536 Ma. It is a major geological event to create the Pannotia-a true supercontinent. The break up of Pannotia during the last stage of Cambrian（ ca.510 Ma）leads to the original Paleo-Laurasia carried Huatai Craton and Rocky Mts. terrene drifting from the Gondwanaland. As a consequence,the South Pacific Ocean is opened between both the ancient continents. Until the Late Ordovician（ca.440 Ma）,the breakup of Paleo-Laurasia to create the North Pacific Ocean, caused that both the Huat
出处
《地质科学》
CAS
CSCD
北大核心
2014年第1期1-18,共18页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
中国地质调查局项目"中国主要陆块晚前寒武纪以来裂解重组过程的再造及其对成矿作用的制约"(编号:1212011121064)
"中美矿产资源对比研究"项目(编号:1212010561502)资助
