资源调查与环境
資源調查與環境
자원조사여배경
RESOURCES SURVEY & ENVIRONMENT
2012年
1期
9-15
,共7页
米钵山组%沉积特征%意义
米缽山組%沉積特徵%意義
미발산조%침적특정%의의
Miboshan formation%sedimentary characteristics%significance
贺兰山中段中、上奥陶统米钵山组,在整个区域地层中占有重要地位,它是贺兰山南北向构造形成的重要标志。其地层明显区别于相邻地台区的沉积,对探讨贺兰山早古生代的构造格局及岩相古地理尤为重要。但对米钵山组沉积环境多有争论,观点各不相同。本文对该区米钵山组沉积特征、沉积层序、沉积岩相和古地理环境进行了分析研究,并划分为碎屑流、浊流和正常深水沉积三种类型,推断贺兰山南北向构造在加里东中期开始形成,并延续到白垩纪的新认识。
賀蘭山中段中、上奧陶統米缽山組,在整箇區域地層中佔有重要地位,它是賀蘭山南北嚮構造形成的重要標誌。其地層明顯區彆于相鄰地檯區的沉積,對探討賀蘭山早古生代的構造格跼及巖相古地理尤為重要。但對米缽山組沉積環境多有爭論,觀點各不相同。本文對該區米缽山組沉積特徵、沉積層序、沉積巖相和古地理環境進行瞭分析研究,併劃分為碎屑流、濁流和正常深水沉積三種類型,推斷賀蘭山南北嚮構造在加裏東中期開始形成,併延續到白堊紀的新認識。
하란산중단중、상오도통미발산조,재정개구역지층중점유중요지위,타시하란산남북향구조형성적중요표지。기지층명현구별우상린지태구적침적,대탐토하란산조고생대적구조격국급암상고지리우위중요。단대미발산조침적배경다유쟁론,관점각불상동。본문대해구미발산조침적특정、침적층서、침적암상화고지리배경진행료분석연구,병화분위쇄설류、탁류화정상심수침적삼충류형,추단하란산남북향구조재가리동중기개시형성,병연속도백성기적신인식。
Distributed in the middle section of the Helan mountains, the strata of Miboshan formation of the middle and upper Ordovician occupy a significant position in the regional stratigraphic sequence and is the most important mark indicating the formation of northsouth trending tectonics in the region of the Helan mountains. The strata in the region are obviously different from the sediments in its adjacent platform, which is very important for discussion on the tectonic framework and lithofacies palaeogeography of the Helan mountains during the early Paleozoic. In addition, at present, there are many controversies on the sedimentary environment of Miboshan formation. This paper studies on sedimentary characteristics, sedi- mentary sequence, sedimentary lithofacies and palaeogeographic environment of the Miboshan formation, and divides the strata into three types, namely' clastic flows, turbidite flow and normal deep water sediments. Finally, it makes a new understanding that the north-south trending tectonics in the Helan mountains started from the middle period of Caledonian and lasted to Cretaceous.