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塔里木板块奥陶纪运动学特征——来自牙形石的证据

发表时间:2014-11-15  浏览量:1524  下载量:424
全部作者: 景秀春,邓胜徽,王训练
作者单位: 中国地质大学(北京)地球科学与资源学院;中国石油勘探开发研究院实验中心
摘 要: 研究基于对全球洋流模式及其对动物区系形成的影响分析,认为塔里木盆地奥陶纪牙形石分区归属的转换是由古板块运动和古洋流共同作用形成。古地磁资料表明,塔里木板块在奥陶纪完成了从南半球向北半球的漂移,牙形石资料将此运动过程分为2个阶段。第一阶段为桑比期晚期之前,塔里木板块位于南半球且逐渐向北移动,主要受到南半球低纬度洋流的影响而处于北大西洋古生物地理区;第二阶段为桑比期晚期之后,塔里木板块穿过赤道后位于北半球,且继续向北移动,主要受北半球低纬度洋流的影响处于北美中大陆古生物地理区。桑比期晚期牙形石分区归属的截然转换具有明显的板块运动学指示意义,极有可能是塔里木板块穿越赤道的表现。
关 键 词: 地质学;奥陶纪;板块运动;牙形石;塔里木盆地
Title: Kinematic characteristics of the Tarim paleoplate in the Ordovician: evidence from conodonts
Author: JING Xiuchun, DENG Shenghui, WANG Xunlian
Organization: School of the Earth Sciences and Resources, China University of Geosciences; Experimental Center, Research Institute of Petroleum Exploration and Development
Abstract: The effect of global ocean current patterns on bio-provinces was analyzed, and working together of paleo-plate movement and paleo-current is considered as the driving mechanism of the conversion of conodont bio-province changes in the present paper. The drift of the Tarim paleo-plate from the southern hemisphere to the northern hemisphere has been indicated by paleomagnetic data, and the paleo-plate movement is subdivided into two stages by conodont material in this paper. The first stage, the Tarim paleo-plate was located in the south hemisphere before the Sadbian, and was affected by the southern hemisphere ocean currents. Tarim was belonging to north Atlantic province at that time. The second stage, the Tarim paleo-plate was located in the north hemisphere after the Sadbian, and was affected by the northern hemisphere ocean currents. Tarim was belonging to north America midcontinent province after the Sadbian age. The sudden conversion from north China type conodonts to south China type conodonts in the late Ordovician probably represents the crossing equator of the Tarim plate at that time.
Key words: geology; Ordovician; plate movement; conodonts; Tarim basin
发表期数: 2014年11月第21期
引用格式: 景秀春,邓胜徽,王训练. 塔里木板块奥陶纪运动学特征——来自牙形石的证据[J]. 中国科技论文在线精品论文,2014,7(21):2113-2121.
 
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