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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第8期    总第276期    2017年8月

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文章编号:1672-7207(2017)08-2113-06
坳拉槽层序地层学:以湘中坳陷为例
刘辰生1, 2,郭建华1, 2

(1. 中南大学 有色金属成矿预测与地质环境监测教育部重点实验室,湖南 长沙,410083; 2. 中南大学 地球科学与信息物理学院,湖南 长沙,410083)

摘 要: 锡矿山组沉积期是湘中坳拉槽最发育的时期,根据岩性、沉积构造及古生物等沉积相鉴别标志,可识别出深水台盆相、浅水台盆相、局限台地相、滑塌灰岩相和滨岸相等。从锡矿山组可识别出4个三级层序边界,划分出3个三级层序。从这3个层序均可识别出海侵体系与和高位体系域,海侵体系域为浅水台盆相和深水台盆相沉积,而高位体系域为浅水台盆相、局限台地相和滨岸相沉积;坳拉槽层序在发育过程中受到构造活动、物源和气候等因素的控制,其中构造是主控因素。SQ1层序沉积期边界断裂活动性最强,烃源岩也最发育。

 

关键字: 坳拉槽;锡矿山组;层序地层学;构造活动;烃源岩

Sequence stratigraphy of aulacogen:taking Xiangzhong depression as an example
LIU Chensheng1, 2, GUO Jianhua1, 2

1. Key Laboratory of Metallogentic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education, Central South University, Changsha 410083, China; 2. School of Geosciences and Info-physics, Central South University, Changsha 410083, China

Abstract:Aulacogen develops best during Xikuangshan formation deposition. According to lithology, sedimentary structure and paleonotology, restricted platform facies, deep water inter-platform, shallow inter-platform and coastal facies can be identified. Four third-order sequence boundaries can be identified, and three third-order sequences can be divided. All of sequence can be subdivided into transgressive system and high stand system. Facies of transgressive system include shallow inter-platform and deep inter-platform. Facies of high stand system include shallow inter-platform, restricted platform and coastal facies. The sequences evolution of Xikuangshan formation is controlled by structure and climate factors, and structure is the major controlling factor. Activity of boundary fault is the strongest during deposition of SQ1, and the source rock develops the most.

 

Key words: aulacogen; Xikuangshan formation; sequence stratigraphy; structure activity; source rock

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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