论文部分内容阅读
近年来对北加利福尼亚与西南俄勒冈宽阔的弗朗西斯科混杂岩中央带(CB)的研究表明,该带是一条古增生杂岩体,又叠加以晚自垩世和(或)早第三纪右行走滑断层系.沿北加利福尼亚混杂岩中心带(CB)的东界,走向N25W的陡倾断层截断了YollaBolly(YB)古缓倾断层和以东的Picket地体.这条走向N25W断层将东面这些地体的板片以及海岸山脉蛇绿岩和Elder溪地体(EC)的大谷岩系,从Clear湖附近向北远远推移到约300Km以北的Orick.此外,依照古生物和古地磁之研究,板片、玄武岩岩块、放射虫燧石以及中央带西部的深海石灰岩(Laytonville型).在北移了上千公里,在中心带内可能至少运移了该距离的一部分.在西南俄勒冈,巨大的Picket峰地体的
In recent years, studies of the broad central CB belt of northern California and southwestern Oregon show that the belt is an ancient Mesozoic complex superimposed with Late Cretaceous and (or) Early Tertiary right-hand walk Slip fault system along the east boundary of the northern California melange center belt (CB), steeply dipping to the N25W intercepts the YollaBolly (YB) paleoclimate dip and the east Picket terrain. This N25W strike east The plates of these terranes, along with the coastal mountain ophiolites and the Elder Creek body (EC) granodiorite, have moved northward from Clear Lake near north to about 300 km north of Orick. In addition, according to paleontology and palaeomagnetic Studies, plates, basaltic rocks, radiolarian chert, and deep-sea limestone in the central western belt (Laytonville type). Moving thousands of kilometers to the north could transport at least part of that distance in the center belt. In southwestern Oregon, Huge picket peak terrain