The"Special"TurbiditeMeasure of the Middle Ordovician Series in Zhuozishan Area, Inner Mongolia
-
摘要: 内蒙古桌子山中奥陶统拉什仲组是由鲍马层序清晰的多层浊积岩组成的浊积岩系,然而其沉积序列总厚度以及浊积岩内部特征等诸多方面,又与那些形成于不稳定或次稳定型外陆架边缘直至深海盆内的巨厚浊积岩系有着明显的差异,因此将拉什仲组以“特殊”浊积岩系称之。文中在对这两种浊积岩系进行多方面的对比研究后,进而从沉积相、相组合、浊流的古流向以及遗迹化石群落的生态特征等方面,阐述了形成拉什仲组浊流盆地的特征,并认为:充填这套“特殊”浊积岩系的海盆是位于稳定地块之间、盆地地形简单、坡度不大、海水深度在浪基面以下200m左右、含氧量较充足的深水浊流盆地。Abstract: The Lashizhong Formation of the middle Ordovician in Zhuozishang area, Inner Mongolia is a set of turbidite measures, which is composed of lots of turbidite beds with clear Bouma sequence. However, the eminent differences exist between Lashizhong formation and those formed in the unstable and substable continental shelf margin to the deep-sea basin, such as in their total sequence thickness and internal features. This is the reason thatwe call the turbidite of the Lashizhong Formation as the special'turbidite measure. In this paper, the comparison study is performed according to the two turbidite measures, and, furthermore, elucidate the basin characteristics based on the depositional facies, combination, paleocurrent direction and trace fossil, etc., and reached the conclusion that the Lashizhong turbidite is formed in the stable deep-sea basin, which is located between the stable massifs with simple landscape and gentle slope, and the water depth is 200m under the wave base with ample oxygen.
-
Key words:
- " /
- special" /
- turbidite measure /
- Lashizhong Formation /
- Zhuozishan
-
[1] 1 朱如凯,孟祥化,葛铭. 巴彦浩特盆地东缘中奥陶统混合型深水重力流沉积层序及其旋回[J].沉积学报,1994,(02):77-85.
2 张抗. 鄂尔多斯盆地西、南缘奥陶系滑塌堆积[J].沉积学报,1992,(01):11-18.
3 陈均远. 鄂尔多斯地台西缘奥陶纪生物地层研究的进展[A].北京:科学出版社,1984.8-11.
4 杨式溥,郑昭昌. 内蒙古乌海市中奥陶统公乌素组遗迹化石[J].宁夏地质,1990.102-116.
5 晋慧娟,李育慈,方国庆. 中国古代深海沉积和遗迹化石群落[M].北京:科学出版社,2003.169-180.
6 晋慧娟,李育慈. 西秦岭北带泥盆纪遗迹群落在浊积岩系中的分布特征[J].沉积学报,1997,(01):13-18.
7 晋慧娟,李育慈. 西秦岭二叠纪-三叠纪遗迹化石及其环境意义[J].地质科学,1995,(04):321-328.
8 杨式溥. 青海果洛、玉树地区二叠纪和三叠纪复理石相遗迹化石[J].沉积学报,1998,(01):1-12.
9 KsiazkiewiczM. Trace fossils in the flysch of the Polish Carpathians[J].Palaeontologia Polonica,1977.1-208.
10 WetzelA. Ecologic interpretation of deep-sea trace fossil commnunities[J].Palaeogeography Palaeoclimatology Palaeoecology, 1991. 47-69.
11 VosslerSM,Pemberton S G. Skolithos in the Upper Cretaceous Cardium Fomation: an ichnofossl example of opportunistic ecology[J].LETHAIA,1988.351-362.
12 PiperDJW. Turbidites muds and silts on deep-sea fans and abyssal plains[A].Dowden, Hutchinson and Ross, Stroudsburg,1978.163-176.
13 MuttiE,Ricc-Lucchi F. Turbidites of the Northern Apennines: Introduction to facies analysis English translation, 1978[J].International Geology Review,1972.125-166.
14 PickeringKT,Stow D A V,Waton M P. Deep-water facies,processes and models:a review and classification scheme for modern and ancient sediment[J].Earth-Science Reviews,1986,(02):75-174. -

计量
- 文章访问数: 729
- HTML全文浏览量: 26
- PDF下载量: 960
- 被引次数: 0