摘要
阿根廷前科迪勒拉区寒武─奥陶系地层发育。中晚奥陶世时，前科迪勒拉东部与中部山区为浅水陆棚相，西部山区为斜坡─盆地相。牙形刺的分布主要与平静的暖水大洋有关。寒武纪仅发现晚寒武世Ｐｒｏｃｏｎｏｄｏｎｔｕｓ带，此期间有一次海侵事件。在奥陶纪发现了牙形刺并可识别出四次海侵事件三次海退事件和二次缺氧事件。
Recent investigations on Cambrian and Ordovician rocks show that in the Argentine Precordillera the eastern and central mountain belts represent a shallow shelf facies, and the western mountain belt represents a slope to basin facies.from Middle to Late Ordovician times.The Precordilleran conodonts are mainly related to a calm and warm-water ocean.In Cambrian only the Proconodontus Zone has been found;at this time a Transgressive Event is developed. In Ordovician some conodonts have been found, while 4 transgressive events, 3 falling events and 2 anoxic events can be recognized.
出处
《微体古生物学报》
CSCD
北大核心
1996年第2期125-134,共10页
Acta Micropalaeontologica Sinica
关键词
牙形刺
寒武纪
奥陶纪
前科迪勒拉
阿根廷
Conodonts
Events
Cambrian
Ordovician
Precordillera
Argentina
