欧龙布鲁克地块古生代风暴沉积特征及地质意义
- 中国石油大学(华东)地球科学与技术学院, 山东青岛 266555
基金项目:
中国地质调查局项目（12120115003301）
作者简介:
马帅,男,1990年出生,博士研究生,沉积学与层序地层学,E-mail:mas0302@163.com
- 收稿日期:
2015-12-30
- 修回日期:
2016-04-13
- 刊出日期:
2017-02-10
摘要: 为进一步研究欧龙布鲁克地块古生界频繁发育的风暴沉积所暗含的地质信息，探讨风暴频发型古气候对柴北缘地区古生代沉积的影响，对研究区古生界各剖面进行了详细的野外勘察及室内实验等综合分析，以底面侵蚀构造、砾屑结构、化石滞留层、丘状交错层理以及同沉积涡流侵蚀构造等作为典型的沉积构造标志，识别出包括风暴高峰期、原地卸载期、回流期、涡流期以及停息期等风暴作用不同阶段产物。根据不同阶段风暴产物的组合形式，将出露的多套风暴沉积划分为代表不同沉积环境下的风暴序列类型，其中早古生代发育5种原地或近源型风暴沉积序列，晚古生代则发育对应原地搅动型、近源型以及深水缓坡型风暴沉积的风暴沉积序列。再综合研究区各古生界剖面的岩性等特征，印证了欧龙布鲁克地块早古生代为持续海侵的浅海环境，而晚古生代则整体处于陆表海环境下海陆过渡相沉积的环境变化特征。
Sedimentary Characteristics and Geological Significance of Storm Deposite of Paleozoic in the Olongbluk Block
- College of Earth Science and Technology, China University of Petroleum, Qingdao, Shandong 266555, China
Funds:
China Geological Survey Project, No.12120115003301
- Received Date:
2015-12-30
- Rev Recd Date:
2016-04-13
- Publish Date:
2017-02-10
Abstract: To further explore the geological significance of the tempestites of Paleozoic that exposed in the Olongbluk block, and investigate the effect of frequently strorm climate on the sedimentary characteristic of Paleozoic in northern Qaidam basin, a comprehensive field geology survey and laboratory analysis have been carried out in the study area, and several typical sedimentary structures have been distinguished in the area, e.g. scour, ripple mark, hummocky cross-stratification, and syngenetic deformation structure. According to the differernt lithology and other characteristics, each set of tempestite can be divided into different sections:activity period, off-load period, returning period, whirling period and rest period. Depending on the combination of the sections, tempestites can be divided into different kinds of storm sequences to represent different sedimentary environment. The early Paleozoic developed five storm sequences which represent in-situ-type sequence or near source sequence, and the late Paleozoic developed near source sequence, in-situ-agitational sequence and deep-slope sequence. Under the research of the lithological characteristics of Paleozoic, the Olongbluk area was in a shallow sea environment which was always effected by transgression in early Paleozoic,and changed into epicontinental sea environment in the late.
马帅, 陈世悦, 汪峰, 邵鹏程, 王志金. 欧龙布鲁克地块古生代风暴沉积特征及地质意义[J]. 沉积学报, 2017, 35(1): 35-45. doi: 10.14027/j.cnki.cjxb.2017.01.004
MA Shuai, CHEN ShiYue, WANG Feng, SHAO PengCheng, WANG ZhiJin. Sedimentary Characteristics and Geological Significance of Storm Deposite of Paleozoic in the Olongbluk Block[J]. Acta Sedimentologica Sinica, 2017, 35(1): 35-45. doi: 10.14027/j.cnki.cjxb.2017.01.004
| Citation: |
MA Shuai, CHEN ShiYue, WANG Feng, SHAO PengCheng, WANG ZhiJin. Sedimentary Characteristics and Geological Significance of Storm Deposite of Paleozoic in the Olongbluk Block[J]. Acta Sedimentologica Sinica, 2017, 35(1): 35-45. doi: 10.14027/j.cnki.cjxb.2017.01.004
|
点击查看大图
下载:
